JPH07205A - Concavo-convex shaped sheet and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] [Purpose] To further improve the anti-slip property and design of the uneven pattern in the uneven molded sheet. [Structure] The concavo-convex shaped sheet S of the present invention is the base sheet 1
0 is formed by closely adhering a concavo-convex pattern 3 having a predetermined shape, and the concavo-convex pattern 3 is formed into a multi-layered structure by a plurality of pattern elements 4 having different sizes, shapes, and properties. It is characterized by being formed.
Further, in the method for producing a concavo-convex shaped sheet of the present invention, a plurality of stencil plates 5 are used, the stencil plates 5 are taken out one by one from these stencil plates 5, and the elastomer liquid raw material P is injected into the stencil plates 5, which is semi-cured. When the state is reached, the next stencil 5 is sequentially placed, and the same work is repeated to finally form the concavo-convex pattern 3 of a predetermined shape on the base sheet 10 in close contact.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like member having a concavo-convex pattern provided for the purpose of anti-slip property such as the sole of sports shoes, and a method for producing the same, and more particularly to further anti-slip property and design. TECHNICAL FIELD The present invention relates to a concavo-convex shaped sheet having improved properties and a manufacturing method thereof.

[0002]

BACKGROUND OF THE INVENTION In order to reduce the weight and improve the impact absorption of sports shoes used for various sports such as jogging, basketball and tennis, an outer sole, which is the lowest layer of the sole directly in contact with the ground, is used. Is made of solid rubber or high-density sponge, and the upper layer is constructed by stacking one or more sponges such as EVA (ethylene vinyl acetate) that are lightweight and have excellent cushioning properties, and try to make the shoe sole a multi-layer structure. Has been done.

However, although these solid rubbers and high-density sponges are relatively hard and exhibit excellent effects in terms of ground gripping force and abrasion resistance, on the other hand, they are heavy and light in weight. There were difficulties.

Therefore, in recent years, in addition to the improvement of the material for the sole, various molding methods for the sole have been devised. For example, a method in which a polyurethane resin film on a non-woven fabric sheet and a liquid polyurethane composition before forming non-slip projections are placed in a mold and heat-cured to integrally bond them (Japanese Patent Laid-Open No. 1-3106).
No. 01) is mentioned as an example. Further, even the applicant of the present invention, the stencil is placed in close contact with the non-woven fabric, the polyurethane elastomer containing a thickener is poured into the stencil,
A method of forming an embossed sheet by squeegeeing and then heat-curing to form an embossed sheet "Patent application 4"
No. 185922) and many other applications.

However, there is a limit in improving the anti-slip property only by improving the material as described above, and in order to achieve further anti-slip property, the height of the uneven pattern formed on the sole of the athletic shoe is high. It is also necessary to consider other factors such as the ground contact area, the shape of the ground contact surface, and the pattern layout. However, in order to satisfy these conditions, the shape of the concavo-convex pattern is inevitably complicated.
If a die is used for molding as in Japanese Patent No. 0601, the cost of producing the die is significantly increased.

The above-mentioned Japanese Patent Application No. 4-18 filed by the present applicant.
The method disclosed in Japanese Patent No. 5922 for forming a concavo-convex pattern using only one stencil is suitable for forming a concavo-convex pattern having a relatively simple shape, and is not suitable for forming a concavo-convex pattern having a complicated shape as described above. There was a big side.

Further, the concavo-convex pattern formed on the sole of an athletic shoe is generally formed integrally from the same material in many cases. Therefore, in view of improving the anti-slip property or from the standpoint of design, a partial pattern is formed. Although there are some aspects in which it is desired to change the properties of the concavo-convex pattern, conventionally, such an attempt has not been made at all due to the manufacturing reasons described above.

[0008]

[Technical Items Attempted to Develop] The present invention has been made in consideration of such a background, and by forming a concavo-convex pattern in stages by using a plurality of stencil plates, This is an attempt to develop a novel unevenly shaped sheet and a method for manufacturing the same, which meet the demand for designability.

[0009]

[Constitution of the invention]

[Means for Achieving the Object] That is, a concavo-convex molded sheet according to the first invention of the present application is a concavo-convex molded sheet obtained by closely forming a concavo-convex pattern of a predetermined shape on one surface of a base sheet, wherein the concavo-convex pattern has a size, It is characterized by being formed in a multi-layer by combining a plurality of pattern elements having different shapes or properties in whole or in part.

In addition to the above requirements, the concavo-convex shaped sheet according to the second invention of the present application is characterized in that the concavo-convex shaped sheet is an outer sole formed in the bottom layer of the shoe sole.

Furthermore, in addition to the above requirements, the third aspect of the present invention according to the present application is that the ground plane of the concave-convex pattern is formed in a concave shape as a whole, and the peripheral edge of the ground plane is the concave-convex pattern. It is characterized in that it is formed at an acute angle with respect to the side surface of.

In addition to the above-mentioned requirements, the fourth aspect of the present invention according to the present application is that the pattern elements forming the concavo-convex pattern are colored differently at least between the pattern elements facing up and down. It is characterized by being present.

Furthermore, in addition to the above requirements, the concavo-convex shaped sheet according to the fifth invention of the present application has a multi-step structure in which the concavo-convex pattern is formed by changing the size of each pattern element or by making both the size and the shape different. It is characterized by being formed into a shape.

Furthermore, in the method for producing a concavo-convex molded sheet according to the sixth invention of the present application, a base sheet is placed on a base, and holes having a predetermined shape are previously formed in a pattern on the base sheet. In the method for producing a concavo-convex shaped sheet by placing a stencil, injecting an elastomer liquid raw material into the stencil, and further curing the squeegee, the stencil has at least a base side stencil and a ground side. Two stencil plates are used, of which the base side stencil plate is first placed on a base sheet, a predetermined amount of the elastomer liquid raw material is injected into this, and squeegee treatment is performed to semi-cure the elastomer liquid raw material. In the state, when the base layer is formed, the ground side stencil is placed, and after a predetermined amount of the elastomer liquid raw material is injected in the same manner,
After squeegee treatment, this elastomer liquid raw material is cured to a depressurizable state, and when the grounding layer is formed, each of these stencil plates is sequentially depressurized, and the one on which the concavo-convex pattern of the prescribed shape is closely formed on the base sheet is taken out. The present invention is characterized in that a concavo-convex molded sheet is manufactured by completely curing this.

Furthermore, in addition to the requirements of claim 6, the method for producing a concavo-convex molded sheet according to the seventh invention of the present application,
In addition to the base side stencil and the ground side stencil, one or more intermediate position stencil is used as the stencil, and after the base layer is formed by the base side stencil, the intermediate position stencil is placed on this stencil. On the other hand, after injecting a predetermined amount of the elastomer liquid raw material, squeegee treatment is performed, and when this elastomer liquid raw material is in a semi-cured state, another intermediate position stencil is placed on the squeegee. Is placed in a semi-cured state and an intermediate layer is formed, a ground-side stencil is placed on the stencil to form a ground layer.

Furthermore, the eighth invention of the present application according to the present invention is directed to a method for producing a concavo-convex molded sheet, in which a stencil having holes of a predetermined shape formed in a pattern in advance is placed on a base, and the elastomer liquid is applied to the stencil. Injecting the raw material, further squeegee treatment, covering it with a base sheet and pressing it from above, and in this state, by curing the elastomer liquid raw material, in the method for producing a concavo-convex shaped sheet, the stencil is at least on the base side. Two stencils, a stencil and a ground side stencil, are used. Of these, the ground side stencil is first placed on a breathable sheet, and a predetermined amount of the elastomer liquid raw material is injected into this, and squeegee treatment is performed to obtain this elastomer liquid. When the raw material is in a semi-cured state and the ground layer is formed, the base layer is laminated on the ground layer.

Furthermore, a method for producing a concavo-convex molded sheet according to a ninth invention of the present application, in addition to the requirements of claim 8,
When placing the ground-side stencil on the base, first place the breathable sheet on the base, then place the ground-side stencil on this breathable sheet, or after applying the release agent on the base. The feature is that a ground side stencil is placed.

Furthermore, in addition to the requirements of the above-mentioned Claims 8 and 9, the method of manufacturing a concavo-convex molded sheet according to the tenth invention of the present application is such that, in laminating the base layers, the base side is formed at the place where the ground layer is formed. It is characterized in that a stencil is placed, the elastomer liquid raw material is semi-cured in the same manner, and the base sheet is covered when the base layer is formed.

Furthermore, in the method for producing a concavo-convex molded sheet according to the eleventh invention of the present application, in addition to the requirements of the above claims 8 and 9, in laminating the base layer, when a ground layer is formed, It is characterized in that an intermediate product in which a base layer is laminated on a base sheet is covered in a separate step.

The twelfth aspect of the present invention relating to the method for producing a concavo-convex molded sheet according to the present invention,
In addition to the requirements of No. 11, in addition to the base side stencil and the ground side stencil, one or more intermediate position stencil is used as the stencil, and after the ground layer by the ground side stencil is formed, the intermediate position stencil is mounted. In the same manner, after the elastomer liquid raw material is in a semi-cured state and the intermediate layer is formed, the base side stencil is placed on the upper part of the intermediate layer to form the base layer. is there.

Furthermore, a method for producing a concavo-convex molded sheet according to a thirteenth invention of the present application is the above-mentioned claim 6, 7, 8,
In addition to the requirements of 9, 10, 11, and 12, each stencil plate is characterized by being formed by laminating a plurality of thin plates each having a hole portion formed by etching. The object of the present invention is to achieve the object by using the configurations of these inventions.

[0022]

First, in the first, second, third, fourth or fifth invention of the concavo-convex molded sheet according to the present application, the concavo-convex pattern is different in all or part of the size, shape and property. A plurality of pattern elements are combined to form a multi-layered structure. As a result, by applying a different color at least between the pattern elements facing up and down like the fourth invention according to the present application, a band-shaped color pattern is formed on the uneven pattern, which improves the design. In addition to contributing, in the case where the concavo-convex pattern is formed in multiple steps by changing the size of each pattern element or by making both the size and the shape different as in the fifth invention according to the present application, a stepped shape is obtained. It is possible to deal with uneven patterns of complicated shapes that differ in size and shape.

The sixth, seventh, eighth, ninth and tenth aspects of the present application
In the method for producing a concavo-convex shaped sheet as the eleventh, twelfth or thirteenth invention, a plurality of stencil plates are used, one stencil plate is taken out from each of these stencil plates, and the elastomer liquid raw material is placed in the stencil plate. Inject, place the next stencil in sequence when it becomes a semi-cured state, repeat the same work,
Finally, a concavo-convex pattern having a predetermined shape is closely formed on the base sheet. Therefore, the concavo-convex pattern can be formed step by step from the base side or the ground side, thereby changing the properties of each layer formed by each stencil and changing the size and shape to make it complicated. It enables the formation of a concavo-convex pattern.

[0024]

Embodiments of the concavo-convex molded sheet of the present invention and a method of manufacturing the same will now be specifically described with reference to the conceptual diagram shown in the drawings, taking the sole 2 of the sports shoe 1 and the manufacturing process thereof as an example. In the description, first, the structure of the concavo-convex shaped sheet S of the present invention will be described, and then, the structure of the stencil 5 used when molding the concavo-convex molded sheet S and the method for producing the stencil 5, and finally the book. Reference will be made to the method for producing the uneven molded sheet of the invention.

[I] Constitution of Concavo-convex Molded Sheet The concavo-convex molded sheet S of the present invention is formed by closely forming the concavo-convex pattern 3 of a predetermined shape on the base sheet 10. Specifically, the base sheet 10 cut according to the shape of the sole 2 of the athletic shoe 1 is laid out in a pattern with a concavo-convex pattern 3 of a predetermined shape serving as a slip stopper for the athletic shoe 1. Is closely bonded to the base sheet 10.

As the base sheet 10, various materials such as synthetic resin, rubber, and non-woven fabric, which are conventionally used as a base material for the outer sole of the sports shoe 1, can be applied. When a non-woven fabric is used as the base sheet 10, either a thermoplastic fiber or a thermosetting fiber may be used, and as an example, a backskin artificial leather such as Exaine (registered trademark) manufactured by Toray Industries, Inc. is applied. can do. By the way, since there are various colors such as yellow and orange in this Exeine (registered trademark), it is possible to give the shoe sole 2 a design with a color contrast by making the concavo-convex pattern 3 described later, for example, black. .

In addition to the usual non-woven fabric sheet having tear strength, tensile strength and abrasion resistance, a thick film sheet or the like can be applied, and one having adhesiveness or one having a resin film coat Good. As a normal non-woven sheet, one obtained by self-bonding elastic long fibers such as urethane is suitable. In this case, for example, if a thick non-woven sheet having a thickness of about 1 cm is applied, the shoe sole 2 having excellent cushioning properties can be provided. When the film sheet is used as the base sheet 10, it is difficult to express the contrast of the material in design as compared with artificial leather or non-woven fabric, but the color contrast can enhance the design.

When an ultraviolet curable resin is used as the elastomer liquid raw material P for forming the concavo-convex pattern 3, a pattern design corresponding to the concavo-convex pattern 3 may be further printed on the base sheet 10 as described above. It is possible. By doing so, by making the concave-convex pattern 3 transparent or semi-transparent, the color of the pattern design printed on the base sheet 10 can be recognized, and a design effect different from that of the embodiment can be obtained. Obtainable.

Also, various color contrasts can be selected between the color of the base sheet 10 and the color of the ink of the pattern design portion printed on the base sheet 10. For example, if the base sheet 10 is black and the ink printed on the base sheet 10 is a bright color such as yellow or orange, or the base sheet 10 is red and the ink is blue, the color of the base sheet 10 and the ink Color is the saturation,
It is also possible to establish a contrasting color relationship in which the colors of the inks are relatively conspicuous by making one of the lightness and the hue or a combination thereof different.

Next, the concavo-convex pattern 3 will be described. The concavo-convex pattern 3 is a part that constitutes the characteristic configuration of the present invention, and is formed in a multi-layer by combining a plurality of pattern elements 4 having different sizes, shapes, and properties in whole or in part. When it is necessary to distinguish between the plurality of pattern elements 4, the portion closely adhered to the base sheet 10 is the base side pattern element 4b, and the uppermost portion is the ground side pattern element 4c. Distinguish.

The number of layers of the concavo-convex pattern 3 formed by these pattern elements 4 is at least two or more,
Incidentally, when the number of layers is two, the concave-convex pattern 3 has the above-mentioned base side pattern element 4b and ground side pattern element 4c.
Composed of and. When the number of layers is three, as shown in FIG.
As shown in FIG. 5, the intermediate position pattern element 4m exists between the base side pattern element 4b and the ground side pattern element 4c. Further, when the number of layers is four or more, there are a plurality of intermediate position pattern elements 4m.

The structure of the concavo-convex pattern 3 shown in FIGS. 3 and 4 will be described below by taking the case where the number of layers is two as an example.
Incidentally, the one shown in FIG. 3 shows the concavo-convex pattern 3 formed by a method in which the base sheet 10 is first installed and the stencil 5 is stacked on it, and in the case of this method, as will be described later. Squeegee surface has uneven pattern 3
Appears on the side of the ground plane 3a. Therefore, as shown in FIG. 3, the ground contact surface 3a has a gentle concave shape as a whole, and its peripheral portion is formed to be an acute angle by extending the side surface of the concave / convex pattern 3 to some extent upward. The anti-slip property is improved. Further, FIG. 4 shows an uneven pattern 3 which is formed by a method of stacking the stencil 5 (afterwards) and installing the base sheet 10, and in the case of this method, a squeegee treatment is performed as described later. The surface appears on the joint surface between the pattern elements or the joint surface with the base sheet 10. Therefore, the grounding surface 3a becomes smooth as shown in FIG. 4. However, when the breathable sheet 40 is used as will be described later, the action of the breathable sheet 40 blocks the contact with the outside air. It is possible to eliminate unnecessary luster that impairs the texture of the shoe sole 2.

Another embodiment of the two types of concave-convex patterns 3 caused by the difference in the manufacturing method shown in FIGS. 3 and 4 is formed by appropriately combining pattern elements 4 having different sizes, shapes or properties. An example will be described. First of all, as shown in FIGS. 3 (a) and 4 (a), the size and shape of each pattern element 4 are unchanged,
The color scheme is different. Specifically,
In FIG. 4A and FIG. 4A, the base side pattern element 4b has a relatively dark color.

The manner in which the color arrangement of the pattern element 4 is made different is not limited to this, and various modes are possible,
At least the pattern elements 4 facing up and down need to have different color arrangements. Therefore, when the pattern elements 4 are provided in three layers or more, two kinds of colors different in hue, saturation, lightness, etc. are alternately arranged. It is also possible to form a striped pattern, and various modes can be adopted by mixing or substituting a colorless or colored transparent one or a fluorescent one for these. Further, other elements having different properties among the pattern elements 4 include hardness, elasticity, shock absorbing power, luster or satin feeling.

In FIGS. 3 (b) and 4 (b), the size of the pattern element 4 is gradually reduced as it goes upward in the figure, and the concavo-convex pattern 3 is formed stepwise. Is. The mode for changing the size of the pattern element 4 is not limited to this, and another mode can be selected as long as it is within a range in which the stencil 5 can be depressurized.

Further, in FIGS. 3C and 4C, not only the size of each pattern element 4 but also its shape is changed. Specifically, the ground side pattern element 4c having a plane circular shape is stacked above the base side pattern element 4b having a plane elliptical shape. The combination of the size and shape of each pattern element 4 is not limited to this, and various combinations can be selected. Further, there is a change in the characteristics as shown in FIGS. 3 (a) and 4 (a). By combining them, the concavo-convex pattern 3 of many modes can be formed. The description of the material of the concavo-convex pattern 3 is omitted here, and will be described in detail in the section of the method for manufacturing the concavo-convex molded sheet described later.

[II] Structure of stencil and method for making the same Next, the structure of the stencil 5 and a method for making the stencil 5 which are necessary for producing the unevenly formed sheet S of the present invention as described above will be described. In the present invention, a slightly thin stencil 5 is used. This is because a plurality of stencil plates 5 are used in manufacturing the concavo-convex shaped sheet S as will be described later. Therefore, the relationship between the height of the concavo-convex pattern 3 and the number of the stencil plates 5, the size of the concavo-convex pattern 3, This is set in relation to the change in the suction force between the stencil plates 5 caused by the difference in shape and the method of forming the concavo-convex pattern 3. For example, when using the two stencil plates 5 to form the concavo-convex pattern 3 having a two-layer structure composed of the base side pattern element 4b and the ground side pattern element 4c, the stencil plate 5 having a thickness as shown in Table 1 below is used. Can be adopted as an example. Further, in Table 1, "pre-placement of base sheet" means that the base sheet 10 is first set and the stencil 5 is stacked on the base sheet 10, and "post-placement of base sheet" is displayed. Stencil 5
The case where the base sheet 10 is installed after stacking is shown. These indications will also be used in the description of the method for producing a concavo-convex shaped sheet described later. Further, in Table 1, “upper” is indicated by the above-mentioned two types of uneven patterns 3
In the molding method, the thickness of the stencil 5 located above each is shown, and "bottom" in Table 1 indicates the thickness of the stencil 5 located below each.

[0038]

[Table 1]

As shown in FIG. 5 (a), such a stencil 5 is provided with holes 6 having a predetermined shape in accordance with the shape and layout of the concave / convex pattern 3 to be formed. In principle, the position where the holes 6 are provided is required to be common to all the stencil plates 5, but the size and shape of the holes 6 correspond to the pattern elements 4 described above, It can take various forms. Incidentally, in the present invention, since a plurality of stencil plates 5 are used in close contact with each other, it is advantageous to make the contact area between the stencil plates 5 as wide as possible in order to enhance the adhesion effect. Therefore, in the present invention, as shown in FIG. 7B, as compared with the uneven pattern 3 having a relatively large area difference between the pattern elements 4, the uneven pattern having a small area difference between the pattern elements 4 as shown in FIG. 7A. Pattern 3 is preferable. Further, since a plurality of stencil plates 5 are used in the present invention, it is necessary to separately provide a guide hole 7 for aligning the stencil plates 5 in a part of the stencil plate 5 or to improve the adhesion between the stencil plates 5. Become.

Then, as an example thereof, a method of bringing the stencil 5 into close contact by utilizing magnetic force will be described. As a method for bringing the stencil 5 into close contact with such a magnetic force, two methods can be selected depending on whether the magnetic force is applied to the base 20 side or the stencil 5 side. Here, the case of giving a magnetic force to the base 20 side most suitable for actual use will be described first. In this case, the base 20
Is composed of, for example, an electromagnetic chuck widely used as a work holding device for a surface grinder, and the stencil 5 to be attracted by this is composed of a relatively thin iron plate having the above-mentioned thickness dimension. As the base 20, a permanent magnet chuck, a permanent magnet, or the like, which can be expected to have the same action, can be used.

As a method for forming the holes 6 in the stencil 5, an etching method can be considered as an example.
That is, in the case of etching, first, a plurality of thin plates 50 are prepared, and the thin plates 50 are etched to form the holes 6 having the same shape and the same pattern in each thin plate 50. And in this way the hole 6
As shown in FIGS. 5B to 5I, the thin plates 50 on which the layers are formed are adhered to each other and bonded in a laminated state to form the stencil 5.

More specifically, in forming the stencil 5 having a thickness of 1.6 mm, two thin plates 50 having a thickness of 0.8 mm are prepared as an example. Then, the upper and lower surfaces of these two thin plates 50 are covered with the protective films 51, respectively, and etching is performed from both sides. Further, an adhesive agent such as an epoxy-based adhesive agent, which can form a hard adhesive layer, is applied between the two thin plates 50 in which the holes 6 are formed by such an etching process, and the two thin plates 50 are bonded together. The stencil 5 is prepared by joining in a laminated state.

Incidentally, when the stencil plate 5 is formed in this manner, the draft can be made much smaller than when the thick single plate shown in FIGS. 5 (b)-(ii) is etched from one side. . Specifically, by performing etching treatment from both sides, the draft is halved as compared with the case where etching is performed from only one side, and by using the thin plate 50, the draft becomes smaller as the plate thickness decreases.
The reduction of the draft thus formed improves the fluidity when the elastomer liquid raw material P is injected, and
Makes it easy to remove the plate.

When the etching treatment is performed from both sides in this way, the treatment time is shorter than that in the case of one side, and by using the thin plate 50, the hole portion 52 formed in the protect film 51 is reduced. Even if the dimensional accuracy is not so high, there is no problem in forming the hole 6 formed in the thin plate 50. Therefore, along with this, the manufacturing time of the protective film 51 can be shortened and the manufacturing cost thereof can be reduced.

Further, when such an etching method is adopted, the residual stress is small as compared with the case where the hole 6 is formed by mechanical cutting, and the warp of the product caused by the residual stress occurs. It prevents the leakage of the elastomer liquid raw material P by improving the adhesion between the stencil 5 or the base 20. Further, as described above, the thin plate 50
In the case where the above is used and is configured to be bonded with an adhesive, the rigidity can be increased as compared with the case where the stencil 5 is formed by a thick single plate due to the bonding rigidity. Further, as another method for forming the holes 6 in the stencil 5, Japanese Patent Application No. 4-307574 “Method for manufacturing embossed sheet” and Japanese Patent Application No. 4-343146 “Method for manufacturing embossed sheet” related to the present applicant's application In addition to the method of using the master mold, the method of using a photo-curable resin film, the method of sandblasting, etc., the holes 6 are formed on a metal plate, a resin plate, etc. by wire cutting, laser, punching, pressing, etc. It is possible to adopt various methods such as a method of forming a stencil by forming a stencil.

Although not shown, the stencil 5 to be laminated
The size of the magnetic characteristics is different for each of them, and the magnetic characteristics are set to be smaller toward the base sheet 10 side, and the magnetic characteristics of the uppermost stencil 5 are set to be the largest, and the stencil to be laminated is set. It is also possible to adopt an arrangement mode in which the magnetic characteristics among the five are balanced.

Next, a case where a magnetic force is applied to the stencil 5 side will be described. In this case, as the base 20, for example, a plate-shaped member made of a magnetic metal such as iron or a block-shaped member having a thicker wall is used, but the following is used as the stencil 5. It First, FIG. 8 (a)
In the case shown in (1), the stencil 5 itself is formed by a permanent magnet. As the permanent magnet, a plastic magnet that can be easily molded and is excellent in mass productivity can be used as an example. The plastic magnet is made by adding magnetic powder such as ferrite to a thermosetting or thermoplastic resin, and more preferably, samarium / cobalt magnetic powder and plastic that do not drastically reduce magnetic properties even when thinned. It is preferable that the rare earth-shaped plastic magnet is formed by molding a mixture of metals. When a resin material is used as the stencil 5 as described above, the elastomer liquid raw material P (resin material) is used.
Since it is expected that both of them adhere to each other due to their affinity with the above, it is necessary to take measures such as thinning the stencil 5 in consideration of the releasability, and to separately apply a release agent when used.

Further, as shown in FIG. 8 (b), the suction acting portion 8 is provided at an appropriate portion of the stencil 5 where the hole portion 6 is not engraved.
Is provided. The attraction portion 8 is a permanent magnet 8
A non-magnetic ring 8b made of, for example, brass is used to cover the periphery of a, and the permanent magnet 8
a cuts off the magnetic characteristics in the plane direction exerted by a on the stencil 5;
This is intended to be used by apportioning it to the close contact of the stencil 5 laminated on top and bottom. Therefore, with such a configuration, it is possible to enhance the magnetic characteristics, and the permanent magnet 8a
As the above, it becomes possible to use a plastic magnet having a usual composition using ferrite and a sintered magnet using alnico, ferrite or the like.

In addition to the method of utilizing the magnetic force as described above, the stencil 5 can be closely adhered to each other by spraying mist-like water droplets between the stencil 5 and freezing it. In addition, a few drops of water or adhesive liquid for temporary adhesion are dropped between the stencil plates 5 to superimpose them, or a mechanical engaging means is separately provided between the stencil plates 5 to achieve close contact. Various adhesion means can be adopted. For the base side stencil 5 in contact with the base sheet 10, for example, a base 20 composed of a permanent magnet is used, and when the base sheet 10 is sandwiched by the magnetic force of the stencil 5 and the base 20, It goes without saying that it is necessary to carry the magnetic metal on at least the surface of the stencil 5.

[III] Method for Producing Concavo-convex Molded Sheet The method for producing a concavo-convex molded sheet of the present invention will be divided into the case of “previously placing the base sheet” and the case of “post-arranging the base sheet”. The latter will be specifically described based on FIGS. 9 and 10, and based on FIGS. 11 to 13. A. ] Preliminary placement of base sheet i) Installation of base side stencil (see FIGS. 2 (a) and 9 (a)) First, the base sheet 10 is placed on the base 20, and the base side pattern element 4b is placed above it. The stencil 5 used to mold the is set. When the stencil 5 is used separately, the stencil 5 will be described as a base stencil 5b and a ground stencil 5c respectively corresponding to the base side pattern element 4b and the ground side pattern element 4c. Also, the intermediate position pattern element 4
When m exists, an intermediate position stencil 5m is separately required corresponding to this as shown in FIG.

Ii) Pouring of Elastomer Liquid Raw Material In this way, when the stencil 5 is set in close contact with the base sheet 10, an elastomer for forming the concavo-convex pattern 3 on the holes 6 in the stencil 5 as shown in FIG. 9 (a). The liquid raw material P is poured. In addition, when pouring a polyurethane elastomer as the elastomer liquid raw material P, FIG.
In addition to the method of mixing the two liquids of the raw material in the container, degassing and pouring, as shown in the figure, using a static mixer that is often used in industry (not shown), mix the two liquids in the cylinder and It is also possible to use a method of injecting or spraying while mixing the two liquids of the raw material at the tip of the nozzle as shown in FIG. 9 (a ').

This polyurethane elastomer is composed of a mixed solution of a prepolymer and polyisocyanate and is cured by heating it. Particularly, as a polyurethane elastomer to be supplied by spraying from a nozzle, Nippon Synthetic Chemical Examples include solventless quick-hardening urethane resins manufactured by Kogyo Co., Ltd. It is desirable to heat the elastomer liquid raw material P before spray mixing with a nozzle, and it cures in about 20 seconds gel time. It is also possible to add a solvent to this in order to adjust the viscosity and hardness. In addition, as the polyurethane elastomer, it is possible to use a mixture of Nipollan (registered trademark) of Nippon Polyurethane Industry Co., Ltd., which is a prepolymer, and Pandex (registered trademark) of Dainippon Ink Co., Ltd., which is a polyisocyanate. Is. In addition, it is expected that it is necessary to prevent outflow from the stencil 5, and therefore it is preferable to mix a thickener into these raw materials.

A specific example of the thickener is AEROSIL (registered trademark) manufactured and sold by Nippon Aerosil Co., Ltd. This is the highest purity silica (S
iO ₂ 99.8%), is composed of ultrafine particles of 7 mμ to 50 mμ, and is a harmless substance having high surface area and high dispersibility. This AEROSIL (registered trademark) serves as a thickener because it can impart the rheological properties necessary for processing liquid substances such as polyester and epoxy resin with a small amount of addition due to the action of hydrogen cross-linking of silanol groups on the surface. It has the function of. In addition to the above AEROSIL, it is of course possible to add other fillers.

A photo-curable resin may be applied as the other elastomer liquid raw material P. Here, among the photo-curable resins, an ultraviolet-curable resin which is cured in a short time by irradiation with ultraviolet rays will be described as an example.

In selecting the ultraviolet curable resin, ultraviolet rays reach the depth of the hole 6 or are printed on the base side pattern element 4b and the base sheet 10 from other pattern elements 4m and 4c which are subsequently molded. Apply a transparent or semi-transparent material before and after curing so that the color of the pattern can be seen through. Moreover, in the present invention, since the uneven pattern 3 is used as the shoe sole 2, the hardened material has an appropriate elasticity, and the tensile strength, tear strength,
An ultraviolet curable resin is used that can withstand the uneven pattern 3 of the shoe sole 2 in terms of abrasion resistance and other required physical properties. In this case, to improve the tear strength,
Fillers such as short fibers may be mixed in the ultraviolet curable resin to the extent that curing is not hindered.

Iii) Squeegee Treatment After pouring a predetermined amount of the elastomer liquid raw material P into the hole 6 of the stencil 5, the squeegee tool 30 is used to protrude from the upper surface of the hole 6 as shown in FIG. 9B. The existing elastomer liquid raw material P is removed. At this time, each hole 6
Of the elastomer liquid raw material P in the inside, a part of the material existing immediately below the upper surface of the hole portion 6 is partially wetted, and the surface tension, contact angle, and wetting of the elastomer liquid raw material P with the hole portion 6 of the stencil 5 and the tip of the squeegee tool 30 are wetted. Squeegee tool 3
0 Remove them together by dragging at the tip.

Iv) Installation of ground-side stencil, pouring of elastomer liquid raw material, squeegee treatment (see FIG. 10) In this way, the elastomer liquid raw material P injected into the holes 6 of the base-side stencil 5b is in a semi-cured state, Ie stencil 5
Can be removed to some extent, and when the pattern elements 4 to be joined are in a cured state to the extent that delamination does not occur, the ground side stencil 5c is installed on the upper surface of the base side stencil 5b. The above-described pouring of the elastomer liquid raw material P and the squeegee treatment are repeated below to obtain the elastomer liquid raw material P.
Is cured until the above-mentioned delamination does not occur.

By such a squeegee treatment, the upper portion of the elastomer liquid raw material P in the hole 6 is formed so as to be recessed all over. In this way, the squeegee treatment for making the upper portion of the elastomer liquid raw material P into the concave shape is performed by using the elastomer liquid raw material P or the normal squeegee tool 30 exemplified in the embodiment without using a special squeegee tool 30 or a squeegee method. , It can be achieved by carefully performing normal squeegee work. The degree of the recessed state is related to the factors such as the surface tension, the contact angle, and the wetting between the elastomer liquid raw material P and the hole 6 of the stencil 5 and the tip of the squeegee tool 30, as described above, rather than the squeegee technique. , The determination of these factors determines most of the degree of depression. By the way, the surface that has been squeegeeed in this way is
It becomes the ground plane 3a of the uneven pattern 3.

V) Plate Removal When the elastomer liquid raw material P injected into the holes 6 of each stencil 5 is cured to the plate-deletable state as described above, the ground side stencil 5c located above the base is sequentially removed. By removing the side stencil 5b in this order and completely curing it, a concavo-convex molded sheet S as shown in FIG. 1 in which the concavo-convex pattern 3 having a multilayer structure is formed on the base sheet 10 is completed.

B. When the base sheet is placed later i) Installation of the breathable sheet (see FIG. 2B) First, the case where the breathable sheet 40 is placed on the base 20 will be described. The breathable sheet 40 may be made of any material having breathability so that at least the air mixed in the holes 6 in the stencil 5 can be discharged to the outside through the holes 6. In addition to those that can discharge air to the outside, those that temporarily leave air in the recesses on the surface of the breathable sheet 40 and the cavity in the tissue are included.

Specifically, in addition to continuous breathable materials such as non-woven fabric and sponge, a matte film such as a polyethylene film having an uneven surface so that the ground surface 3a of the uneven pattern 3 has a rough surface to remove gloss. A film with fine embossing can be used. Incidentally, when a continuous breathable material such as a nonwoven fabric or sponge is used, the air that has entered the holes 6 is discharged to the outside through the breathable sheet 40, and also enters the hollow portion in the tissue of the breathable sheet 40. If you use a matte film or a film with fine embossing, the breathable sheet 4
The air intrudes into the concave portion formed on the surface of No. 0 to discharge the air from the hole 6. Further, when the breathable sheet 40 is brought into close contact with the stencil 5, a release agent is applied in order to facilitate separation from the elastomer liquid raw material P and the stencil 5. Of course, it is also possible to deal with this by making the material of the breathable sheet 40 a material having releasability.

Further, the stencil 5 can be placed directly on the base 20 without interposing the breathable sheet 40. In this case, in order to improve the mold releasability between the stencil 5 and the elastomer liquid raw material P injected into the holes 6 of the stencil 5 and the base 20, a release agent is applied on the base 20 in advance. It is desirable to do so.

Ii) Installation of ground side stencil, pouring of elastomer liquid raw material, squeegee treatment (see FIG. 11) Next, the ground side is provided on the upper surface of such a breathable sheet 40 or the upper surface of the base 20 coated with a release agent. Install the stencil 5c. Then, the elastomer liquid raw material P is poured into the holes 6 of the ground-side stencil 5c as in the case of "A. Base sheet pre-placement" described above. In addition, when pouring a polyurethane elastomer as the elastomer liquid raw material P, a method of mixing two liquids of the raw material in a container and degassing and pouring as shown in FIG. Using a static mixer that is used, mix the two liquids in the cylinder and inject through the nozzle,
It is also possible to spray while mixing the two liquids of the raw material at the tip of the nozzle as in (a ').

When a predetermined amount of the elastomer liquid raw material P is poured into the hole portion 6 of the stencil 5, the elastomer liquid existing outside the upper surface of the hole portion 6 by using the squeegee tool 30 as shown in FIG. 11 (b). The raw material P is removed.

Iii) Installation of the stencil on the base side, pouring of the elastomer liquid raw material, squeegee treatment (see FIG. 12), and the elastomer liquid raw material P in the holes 6 of the ground side stencil 5c is the "A. As in the case, when the semi-cured state is reached, the base side stencil 5b is installed on the upper surface of the ground side stencil 5c. In the same manner, the pouring of the elastomer liquid raw material P and the squeegee treatment are performed.

Iv) Installation of the base sheet, pressing / curing, and depressurization (see FIG. 13) After the flow of the elastomer liquid raw material P and the squeegee treatment are performed in this manner, the base sheet 10 is placed on the upper surface of the base side stencil 5b. Set up. Then, as shown in FIG. 13A, a weight W is applied from above to press the base sheet 10
Is brought into close contact with the base side stencil 5b, and the elastomer liquid raw material P in the holes 6 is cured until the plate can be removed. Then, the weight W is removed from the upper side, the base sheet 10 is pulled up as shown in FIG. 13 (b), and this is completely cured, so that the concavo-convex shaped sheet S as shown in FIG. 1 is completed. Incidentally, in the case of this method, the ambiguity of the contrast with the ground side pattern element 4c due to the protrusion of the base side pattern element 4b is improved. Further, instead of the weight W used here as another pressing means, for example, a pressing device may be used to thereby press the base sheet 10 and the concavo-convex pattern 3.

C. In the case where the formation of the base layer and the formation of the ground layer are separately performed. B. The following method can also be adopted as an intermediate method. i) Formation of Base Layer That is, two bases 20 are prepared, as shown in FIG. Similar to the method of (1), first, the base sheet 10 is placed, and the base side stencil 5b is installed above it. Then, the elastomer liquid raw material P is poured into the holes 6 of the base side stencil 5b, and the elastomer liquid raw material P protruding from the upper surface of the holes 6 is removed by using the squeegee tool 30, as shown in FIG. Form a base layer.

Ii) Formation of Ground Layer On the other base 20, the B. Similar to the method of
When the breathable sheet 40 is used, the breathable sheet 40 is first installed, and when the breathable sheet 40 is not used and the stencil 5 is directly placed on the base 20, the release agent is placed on the upper surface of the base 20. After applying, the ground side stencil 5c is installed above it. Then, the elastomer liquid raw material P is poured into the hole portion 6 of the ground side stencil 5c, and the elastomer liquid raw material P protruding from the upper surface of the hole portion 6 is removed by using the squeegee tool 30, as shown in FIG. 14 (a '). To form a ground layer.

Iii) Joining of Base Layer and Ground Layer Then, when the elastomer liquid raw material P forming the base layer and the ground layer thus formed is in a semi-cured state, as shown in FIG. 14 (b). The ground layer side is placed above the base layer, and pressure is applied from above to cure the elastomer liquid raw material P until it is ready for plate removal. Then, the ground-side stencil 5c and the base-side stencil 5b are deprinted in this order and completely cured to complete the uneven molding sheet S as shown in FIG.

By the way, according to the method C, the base layer and the ground layer can be formed at the same time, which can contribute to the improvement of productivity. Further, when the intermediate layer is formed by using the intermediate position stencil 5m, although illustration is omitted,
The A. B. C. In each of the above methods, the intermediate position stencil 5m is installed between the base side stencil 5b and the ground side stencil 5c, the elastomer liquid raw material P is poured into the holes 6 of the stencil 5m, and the squeegee treatment is further performed to form the intermediate layer. To form.

The concavo-convex shaped sheet S of the present invention can be applied not only to the shoe sole 2 of the sports shoe 1 but also to various things described below. For example, if you show an example, stripes (line) for design and reinforcement protection provided on the upper part of the athletic shoe 1, bicycle and tennis, racket grip for badminton, bicycle saddle and snowboard, surfboard non-slip, baseball, These include gloves for various sports such as soccer and bicycles, grips for various tools, grips for cameras and video cameras, etc.

[0072]

The present invention is constituted by having the above-mentioned constitution, and by providing such constitution, the following effects are exhibited. First, in the molded sheet S according to the first, second, third, fourth or fifth invention of the present application, a plurality of pattern elements in which the concavo-convex pattern 3 is different in all or part of the size, shape and property. 4 are combined to form a multi-layered structure. As a result, as in the second invention according to the present application, if at least the pattern elements 4 facing up and down are colored differently, a band-shaped color pattern is formed on the uneven pattern 3,
This can contribute to the improvement of the design, and the unevenness pattern 3 can be formed in multiple steps by changing the size of each pattern element 4 or changing both the size and the shape as in the fifth invention according to the present application. When formed, it is possible to make the size and shape different in a stepwise manner, and it is possible to deal with buckling, which is a problem when increasing the height of the uneven pattern 3, and insufficient strength on the base side, Furthermore, it is possible to further improve the slip resistance.

The sixth, seventh, eighth, ninth and tenth aspects of the present application
In the eleventh, twelfth or thirteenth invention of the method for producing a concavo-convex molded sheet, at least two or more stencil plates 5 are used, and one stencil plate 5 is taken out from each of the stencil plates 5, and the stencil plate 5 is taken out. 5, the elastomer liquid raw material P is injected, and when the semi-cured state is reached, the next stencil 5 is sequentially placed, the same operation is repeated, and finally the concavo-convex pattern 3 having a predetermined shape is formed on the base sheet 10. The structure is such that they are formed in close contact. Therefore, the concavo-convex pattern 3 is sequentially formed in a multi-layered state, whereby it becomes possible to change the property, the size, and the shape of each layer formed by each stencil 5, and to extend. Will facilitate the formation of the uneven pattern 3 having a complicated shape, which is indispensable for further improving the slip resistance, and can contribute to the reduction of the manufacturing cost. Further, in the present invention, the thickness of the stencil 5 is relatively thin because the uneven pattern 3 is formed by using a plurality of stencil 5. As a result, when the elastomer liquid raw material P is injected into the holes 6 of the stencil 5, the problem of defective defects caused by air mixing, which is a problem, is solved.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view showing an embodiment in which the concavo-convex shaped sheet of the present invention is applied to a shoe sole of an athletic shoe.

FIG. 2 is a vertical cross-sectional side view showing a state in the middle of molding in two types of molding methods for a concavo-convex molded sheet of the present invention.

FIG. 3 is a vertical sectional side view showing various examples of the concavo-convex pattern in the case where the base sheet is placed in advance, and a perspective view showing a part of the pattern.

FIG. 4 is a vertical cross-sectional side view showing various examples of the concavo-convex pattern in the case where the base sheet is placed later, and a perspective view showing a part of the pattern.

FIG. 5 is a perspective view showing a stencil used when a two-layer structure is adopted in the method for producing a concavo-convex shaped sheet of the present invention, and an enlarged cross-sectional view showing the configuration of this stencil in comparison with a conventional stencil.

FIG. 6 is a perspective view showing a stencil used when the same three-layer structure is adopted.

FIG. 7 is a perspective view showing a concavo-convex pattern having a small area difference between pattern elements and a concavo-convex pattern having a large area difference between pattern elements.

FIG. 8 is an enlarged perspective view showing a part of two kinds of stencil plates having different suction means used when a magnetic force is applied to the stencil side.

FIG. 9 is an explanatory view showing, step by step, a method of placing a base sheet in advance in the method for producing a concavo-convex shaped sheet of the present invention, and a perspective view showing a step of forming the base side pattern element.

FIG. 10 is a perspective view showing a forming process of the ground-side pattern element of the above.

FIG. 11 is an explanatory view showing stepwise a method of placing the base sheet on the same as above, which is a perspective view showing a forming process of the ground side pattern element.

FIG. 12 is a perspective view showing a forming process of the above-mentioned base side pattern element.

FIG. 13 is a perspective view showing a process from joining with the base sheet to releasing the plate.

FIG. 14 is an explanatory view showing stepwise a method of separately forming the base layer and the ground layer.

[Explanation of symbols]

 1 Athletic Shoes 2 Sole 3 Concavo-convex Pattern 3a Ground Surface 4 Pattern Element 4b Base Side Pattern Element 4m Intermediate Position Pattern Element 4c Ground Side Pattern Element 5 Hole Plate 5b Base Side Hole Plate 5m Middle Position Hole Plate 5c Ground Side Hole Plate 6 Hole 7 Guide Hole 8 Suction Action Section 8a Permanent Magnet 8b Non-Magnetic Ring 10 Base Sheet 20 Base 30 Squeegee Tool 40 Breathable Sheet 50 Thin Plate 51 Protective Film 52 Pore P Elastomer Liquid Raw Material S Concavo-convex Forming Sheet W Weight

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[Procedure amendment]

[Submission date] July 12, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 8

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

Furthermore, the eighth invention of the present application according to the present invention is directed to a method for producing a concavo-convex molded sheet, in which a stencil having holes of a predetermined shape formed in a pattern in advance is placed on a base, and the elastomer liquid is applied to the stencil. Injecting the raw material, further squeegee treatment, covering it with a base sheet and pressing it from above, and in this state, by curing the elastomer liquid raw material, in the method for producing a concavo-convex shaped sheet, the stencil is at least on the base side. Two stencil plates, a stencil and a ground-side stencil, are used, of which the ground-side stencil is first placed, and a predetermined amount of the elastomer liquid raw material is injected into this stencil,
The squeegee treatment is performed to make the elastomer liquid raw material into a semi-cured state, and when the ground layer is formed, the base layer is laminated on the ground layer.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // B29L 31:50

Claims (13)

[Claims] 1. A concavo-convex shaped sheet obtained by closely forming a concavo-convex pattern of a predetermined shape on one surface of a base sheet, wherein the concavo-convex pattern has a plurality of patterns having different sizes, shapes, and properties in whole or in part. A concavo-convex shaped sheet characterized by being formed in a multi-layer by combining elements. 2. The concavo-convex shaped sheet is an outer sole formed in the bottom layer of the shoe sole.
The uneven molded sheet described. 3. The ground plane of the concavo-convex pattern is formed in a concave shape as a whole, and the peripheral edge of the ground plane is formed at an acute angle with respect to the side surface of the concavo-convex pattern. The uneven shaped sheet according to 1 or 2. 4. The concavo-convex molded sheet according to claim 1, wherein each of the pattern elements forming the concavo-convex pattern has a different color arrangement at least between the pattern elements facing upward and downward. 5. The concavo-convex pattern is formed in multiple steps by changing the size of each pattern element or by making both the size and the shape different. The concavo-convex molded sheet according to 4. 6. A base sheet is placed on a base, and a stencil having holes of a predetermined shape formed in a pattern in advance is placed on the base sheet, and an elastomer liquid raw material is injected into the stencil. In the method for producing a concavo-convex molded sheet by further curing the squeegee, the stencil is used at least two stencils of a base side stencil and a ground side stencil, of which the base side stencil is first Place on a base sheet, inject a predetermined amount of the elastomer liquid raw material into this, squeegee treatment, place the ground side stencil at the time when the elastomer liquid raw material is in a semi-cured state and the base layer is formed Similarly, after pouring a predetermined amount of the elastomer liquid raw material, squeegee treatment is performed, and the elastomer liquid raw material is cured to a plate-removable state to form a ground layer. When the stencil is removed, the stencil is sequentially removed, and a substrate on which a concavo-convex pattern of a predetermined shape is closely formed is taken out and completely cured to produce a concavo-convex shaped sheet. And a method for producing a concavo-convex molded sheet. 7. The stencil includes a base side stencil and a ground side stencil, and one or more intermediate position stencil is used. After the base layer is formed by the base side stencil, the intermediate position stencil is placed. Then, after injecting a predetermined amount of elastomer liquid raw material into this product, squeegee treatment, when this elastomer liquid raw material is in a semi-cured state, if there is another intermediate position stencil, place this, 7. The method for producing a concavo-convex shaped sheet according to claim 6, wherein the grounding side stencil is placed when the elastomer liquid raw material becomes semi-cured and the intermediate layer is formed, thereby forming the grounding layer. Method. 8. A stencil in which holes having a predetermined shape are formed in a pattern in advance is placed on a base, an elastomer liquid raw material is injected into the stencil, and after squeegee treatment, a base sheet is put on the stencil. In the method for producing a concavo-convex molded sheet by pressing and holding from above and curing the elastomer liquid raw material in this state, at least two stencil plates of a base side stencil and a ground side stencil are used as the stencil, of which the grounding First place the side stencil on the breathable sheet,
A predetermined amount of the elastomer liquid raw material is injected into this product, followed by squeegee treatment, and the elastomer liquid raw material is in a semi-cured state, and when the ground layer is formed, the base layer is laminated on the ground layer. A method for manufacturing a concavo-convex molded sheet. 9. When placing the ground-side stencil on the base, first place a breathable sheet on the base, and then place the ground-side stencil on the breathable sheet or separate it on the base. 9. The method for producing a concavo-convex shaped sheet according to claim 8, wherein the ground side stencil is placed after applying the mold agent. 10. When laminating the base layer, a base side stencil is placed when the ground layer is formed, and the elastomer liquid raw material is semi-cured in the same manner, and the base sheet is formed when the base layer is formed. The method for manufacturing a concavo-convex molded sheet according to claim 8 or 9, wherein the method is applied. 11. The lamination of the base layer is characterized in that, when the ground layer is formed, an intermediate product obtained by laminating the base layer on the base sheet is covered in a separate step in a step of forming the ground layer. 9. The method for producing a concavo-convex molded sheet according to 9. 12. The stencil includes a base side stencil and a ground side stencil, and one or more intermediate position stencil is used.
After the grounding layer is formed by the grounding side stencil, the intermediate position stencil is placed, and similarly, after the elastomer liquid raw material is in a semi-cured state and the intermediate layer is formed, the base side stencil is placed on top of it. The method for producing a concavo-convex shaped sheet according to claim 8, 9, 10 or 11, wherein the base layer is formed thereby. 13. The stencil plate is formed by laminating a plurality of thin plates each having a hole portion formed by an etching process.
13. The method for producing a concavo-convex molded sheet according to 10, 11 or 12.