JPH0377721B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a flexible boot body made of synthetic resin for molding the main body, and a sole made of synthetic resin for sole molding, which is harder than the boot body. The present invention relates to injection molded boots comprising:

[Conventional technology]

Traditionally, injection-molded boots consisting of a boot body and a sole were often molded in one piece in one color, but in recent years, so-called injection-molded two-color boots have been developed in which the boot body and sole are different colors. is becoming mainstream. The method for manufacturing these two-color boots usually involves molding the sole after molding the main body. Therefore, such two-color boots have soles of one color and still lack fashionability, and are also insufficient in anti-slip properties. Recent market demands are shifting toward shoes with two-color soles. In this type of molding of two-color soles, for example, the sole itself is molded in multiple steps (usually two times), but usually,
Since materials with similar physical properties are used, the sole itself does not have anti-slip properties.

Furthermore, in the case of such conventional two-color soles,
As mentioned above, in order to mold a separate part of the sole onto the contact surface of the sole, the number of parts of the sole or the number of times of molding increases, the manufacturing process of the boots increases, and the unit manufacturing cost of the boots also increases. It has become a thing.

Furthermore, as shown in FIG. 11, in this conventional method for manufacturing injection molded boots, the heel of the bottom mold 01 is simply inserted into the sole molding gap (not shown), which is the fitting gap between the bottom mold 01 and the dummy last 02. After the sole molding material is injected from the injection hole 03 formed at the bottom position to form the sole 04, the dummy last 0 is injected from the bottom mold 01.
After that, a main body last and side molds (not shown) are disposed on the bottom mold 01, and the boot main body is injection molded onto the sole 04 by a well-known method.

By the way, when the dummy last 02 is removed in the sole manufacturing process, as shown in FIG. Deep heel adhesion (so-called "crying state of the sole 04") was likely to occur. For this,
When injection molding the boot body onto the sole 04, it is not possible to mechanically replace the dummy last 02 with the main body last (not shown), and the sole 04 shrinks due to cooling after injection molding. To,
It is difficult to fit the sole 04 (or a part thereof) once separated into the bottom mold 01 again, and furthermore, if dirt or the like adheres to the surface of the sole 04 separated from the bottom mold 01, the sole 04
of defective products, which reduced the production efficiency of boots.

[Problem that the invention seeks to solve]

The present invention has been made against the background of the above-mentioned conventional technical problems, and it is possible to manufacture the product at low cost by reducing the number of parts and work steps during molding, and the resulting product has an anti-slip function. When the boots themselves and the soles are of different colors, it also has a different color effect, and can also prevent the sole from separating from the bottom mold, which occurs when the dummy last is removed during the sole manufacturing process of the boots. The purpose is to provide injection molded rain boots.

[Means for solving problems]

That is, the present invention provides a boot including a boot body made of synthetic resin for body molding and a sole made of synthetic resin for sole molding, in which a part of the boot body is provided at least in the treading part and the heel part of the sole. A suitable number of main body protrusions are provided, and the distal end surfaces of the main body protrusions are exposed so as to be substantially aligned with the contact surface of the sole, and a floating gap is formed around the main body protrusions. On the other hand, there is provided an injection molded rain boot characterized in that an annular projection is formed on the circumferential surface of the sole side forming the floating gap at least in the heel portion.

[Effect]

When walking while wearing the injection molded boots of the present invention, the tip surface of the main body protrusion made of flexible synthetic resin for main body molding comes into contact with the road surface and has an anti-slip function. The boots bend in a slightly compressed state while being regulated by the protrusions, which improves the slip resistance of the boots and prevents them from slipping. In addition, if the boot body and the sole are different colors from each other, they have a different color effect and are excellent in fashionability. Furthermore, since the main body protrusion is a part of the boot main body that protrudes, the sole only needs to be formed once, streamlining the work process.
This also leads to a reduction in the number of parts, making it possible to produce soles at lower cost, and also preventing the sole from separating from the bottom mold, which occurs when removing the dummy last during the sole manufacturing process. In addition to being able to be replaced with
This prevents dirt from adhering to the surface of the manufactured shoe sole that separates from the bottom mold, resulting in product contamination, which prevents the production of defective soles and improves the production efficiency of boots. .

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, and FIG. 2 is an enlarged view of the X part in FIG. 1, and FIG. 3 is a bottom view of the injection molded boots in FIG. 1. Fig. 4 is an enlarged view of the Y section in Fig. 3, Fig. 5 is an enlarged cross-sectional view of Fig. 3, and Fig. 6 is an enlarged view of the sole state of the injection molded boots of this example when walking. 7 is a central longitudinal sectional view of an injection molded boot in which the circumferential side wall of the sole protrudes from the boot body surface, and FIG. 8 is a central longitudinal sectional view of a sole manufacturing apparatus used for the injection molded boots of the present invention. , Fig. 9 is an enlarged view of the Z part of Fig. 8, Fig. 10
The figure is a central vertical cross-sectional view of the injection molded boots manufacturing apparatus of the present invention.

First, referring to FIG. 1, the injection molded boots A of the present invention are mainly composed of a boots body 1, a lining fabric 2, and a sole 3.

The boot body 1 includes a sole installation portion 11a of the circumferential wall 11.
outer circumferential surface 11a' and exposed outer circumferential surface 1 exposed to the outside.
1b is formed as a smooth surface with no steps, which corresponds to the heel and insole of short shoes,
Body molding made of synthetic resin, for example, injection molded using an injection molding material whose main components are vinyl chloride resin, plasticizer, stabilizer, and pigment (for example, red pigment, blue pigment, or yellow pigment). .

The mixing ratio of the injection molding material for the boots body 1 is usually 100 parts by weight of vinyl chloride resin (so-called straight PVC) with an average degree of polymerization of 1050 to 1450 to 105 to 105 parts by weight of a plasticizer (dioctyl phthalate, dibutyl phthalate, etc.). By using 115 parts by weight, 1 to 3 parts by weight of a stabilizer, and 1 to 3 parts by weight of a colorant, the amount of plasticizer is increased relative to the vinyl chloride resin, and a flexible boot body 1 is molded. . Further, the lining cloth 2 is attached to the entire inner surface of the boot body 1.

Furthermore, the sole 3 is disposed so as to cover the bottom of the boot body 1, and is provided on the peripheral side wall 11 of the boot body 1.
exposed outer circumferential surface 11b and the circumferential side wall 30 of this shoe sole 3
The sole is formed so that the inner circumferential surface 30a of the shoe is connected to the inner peripheral surface 30a without a step, and is made of a synthetic resin for forming the sole, such as vinyl chloride resin (vinyl chloride resin = straight PCV or ethylene-vinyl chloride resin). It is injection molded using an injection molding material whose main components are a plasticizer, a stabilizer, and a colorant (for example, a white pigment).

In addition, the mixing ratio of the injection molding material for the sole 3 is usually as follows when straight PVC is used as the main raw material.
65 to 100 parts by weight of a plasticizer (dioctyl phthalate, dibutyl phthalate, etc.), 1 to 3 parts by weight of a stabilizer, and 1 to 3 parts by weight of a colorant are blended with 100 parts by weight of vinyl chloride resin with an average degree of polymerization of 1050 to 1450. In addition, when using ethylene-vinyl chloride resin as the main raw material, the average degree of polymerization is 2200 to 2800.
For 100 parts by weight of ethylene-vinyl chloride resin,
By using a mixture of 65 to 95 parts by weight of plasticizer (dioctyl phthalate, dibutyl phthalate, etc.), 1 to 3 parts by weight of stabilizer, and 1 to 3 parts by weight of colorant, the The amount of plasticizer is slightly reduced to form a sole 3 having hardness and wear resistance.

The bottom of the boot body 1 has a treading portion 1 on the bottom.
a and the heel portion 1b, as shown in FIG.
Circular protrusions 4 (main body protrusions) made of the same material are molded at the same time as the injection molding of the boot main body 1, and the number of molded protrusions is 5 sets (10 pieces) on the left and right outer edges of the tread part 1a, and 5 pairs (10 pieces) on the left and right outer edges of the tread part 1a, and 5 sets (10 pieces) of the same material as the heel. Five pieces are molded in part 1b.

The length of this circular projection 4 is such that the contact surface 31 of the sole 3 and the tip surface 41 of this circular projection 4 are aligned on substantially the same plane, as shown in FIGS. 1 to 5. It is.

Further, the circumferential side wall 30 of the sole 3 is connected to the boot body 1
When the sole 3 is installed in the sole installation part 11a of
The circumferential wall is diagonally cut out so that the exposed outer circumferential side surface 11b of the circumferential wall 11 of the boot body 1 and the outer circumferential surface 30b of the circumferential wall 30 of the sole 3 are continuous on the same plane.

Further, the sole 3 is formed with a protrusion insertion hole 3c through which each circular protrusion 4 of the boot body 1 can be inserted with ample space.
When the circular protrusions 4 are inserted, that is, when the boot body 1 and the sole 3 are integrally molded, some protrusion floating gaps (floating gaps) 5 are formed around all the circular protrusions 4, and As shown in FIG. 2, an annular protrusion 302 is provided on the boot body 1 side of the shoe sole side circumferential surface 301 forming the protrusion floating gap 5 of the heel portion 1b.
It is integrally molded with and protrudes.

Further, on the outer periphery of the protrusion free movement gap 5 of the sole 3, the free movement width of the circular protrusion 4 is limited so that the circular protrusion 4 is not bent or bent beyond the allowable restoring limit during walking. The protrusion movement limiting cylinder 6 is integrally molded. At this time, in order to effectively maintain the anti-slip function of the projection 4 while limiting the movement width of the circular projection 4, the protrusion movement limiting cylinder 6 has a length that exposes the tip of the circular projection 4 ( That is, the length of the protrusion movement limiting tube 6 is shorter than the length of the circular protrusion 4).

When walking while wearing the injection molded boots A of this embodiment, as shown in FIG. The distal end surface 41 of the boots 4 is pressed against the road surface, and the circular protrusions 4 act as a non-slip surface, making it difficult for the boots to slip. Further, since a protrusion floating gap 5 is formed around the circular protrusion 4, the circular protrusion 4 is pushed and bent in the walking direction like a suction cup with the tip surface 41 and the road surface being pressed together by the walking motion. Therefore, a more effective anti-slip effect can be obtained, and the sole side circumferential surface 3 that forms the protrusion floating gap 5 of the heel portion 1b.
Annular protrusion 302 protruding from the boot body 1 side of 01
As a result, the bending of the circular protrusion 4 during walking is moderately regulated at the base of the circular protrusion 4, thereby reinforcing the base of the protrusion 4 and improving the anti-slip properties of the heel portion 1b, which receives the most weight during walking. In addition to making it better,
The effect of preventing the base of the circular protrusion 4 from being damaged is also obtained by strong crimping of the heel portion 1b against the road surface.

Furthermore, the pushing/bending width of this circular protrusion 4 during walking is limited by the protrusion movement limiting cylinder 6 to the extent that the anti-slip function of the protrusion 4 is not impaired, and furthermore, damage to the protrusion 4 or excessive pushing/bending is prevented. has been done.

Note that the circular protrusion 4 may be disposed at least on the tread portion 3a and the heel portion 3b of the boot body 1, for example, the circular protrusion 4 may be provided on the entire bottom surface of the boot body 1, and its shape may also vary. The shape is not limited to a circle, and the number thereof can be changed arbitrarily. Furthermore, the tip surface 41 of the circular protrusion 4 is
The surfaces do not necessarily have to be exactly aligned on the contact surface of the sole 3, but it is sufficient that the surfaces are approximately aligned so that the anti-slip effect can be obtained without any trouble when walking.

Further, although the protrusion movement limiting cylinder 6 is not necessarily required, it is preferable to form it in order to improve the slip resistance of the circular protrusion 4 and to prevent damage or excessive pushing and bending of the circular protrusion 4.

Further, the annular protrusion 302 not only protrudes from the sole circumferential surface 301 forming the protrusion floating gap 5 of the heel portion 1b, but also protrudes from the sole circumferential surface 301 of the protrusion floating gap 5 at an arbitrary position. They may be provided in a protruding manner, for example, they may be provided in a protruding manner on the sole-side circumferential surface 301 of all the protrusion floating spaces 5. Furthermore, the protruding position of the annular protrusion 302 on the sole side circumferential surface 301 is not limited to the boot body 1 side, and may be on the road surface side, etc.; The boot body 1 side, which is difficult to see from the 3 sides of the sole, is in good condition.

Further, the annular protrusion 302 is not necessarily limited to an annular shape, but can appropriately restrict the bending of the circular protrusion 4 during walking, and can also be used to properly control the bending of the sole 3 during removal of the dummy last in the sole manufacturing process described later.
Any shape can be adopted as long as it can prevent the material from separating from the mold.

Furthermore, the molding materials for the boot body 1 and the sole 3 are not limited to those made primarily from vinyl chloride resin as described above, but may be made from other thermoplastic synthetic resins.

Furthermore, the colors of the boots body 1 and the soles 3 are as follows:
The colors are not limited to the above-mentioned red, blue, yellow, or white, but may be different colors from each other, and in some cases may be the same color.

Furthermore, the present invention is not limited to the injection molded boots A of the previous structure, but can be applied to injection molded boots made of synthetic resin of any other structure.

In addition, in the present invention, the circumferential side wall 30 of the sole 3 is
As shown in the figure, the sole installation part 11a of the boot body 1
When the sole 3 is installed, the peripheral wall does not need to be cut out diagonally so that the outer peripheral surface 11b of the peripheral side wall 11 of the boot body 1 and the outer peripheral surface 30b of the sole 3 are connected on the same plane, For example, as shown in FIG. 7, the outer peripheral surface 30b of the thick peripheral side wall 30 may be installed so as to protrude somewhat from the boot body 1.

The method for manufacturing injection molded boots A of the present invention is not particularly limited, but for example, as shown in FIG.
A cylindrical protrusion 82 that can be fitted into the bottom mold 71 and form a circular protrusion on the bottom mold 71.
is provided to align with the dummy last 81, thereby aligning the top surface of the bottom mold 71 with the dummy last 81.
A sole molding gap 83 is formed by separating the lower surface of the shoe, and a sole molding material (synthetic resin for sole molding) is injected into this sole molding cavity 83 from an injection hole 84 for the sole molding material. The sole 3 is molded.

As shown in FIG. 9, an annular protrusion forming groove 821 for forming the annular protrusion 302 is carved on the circumferential surface of the distal end of the protrusion 82 of the bottom mold 71, thereby forming the sole 3 by injection molding. When the dummy last 81 is then removed from the bottom mold 71, the molded annular projection 302 gets caught in the annular projection molding groove 821, which prevents the sole 3 from separating from the bottom mold 71 when the dummy last 81 is removed. Therefore, it is possible to replace the mechanical dummy last 81 with the main body last (not shown), and the product is prevented from becoming contaminated due to dirt adhering to the surface of the manufactured shoe sole that is separated from the bottom mold. Therefore, the production of defective soles can be prevented, and the production efficiency of boots can be improved.

The dummy last 81 is provided with a protrusion 82 corresponding to the circular protrusion 4 (main body protrusion) on the lower surface of the dummy last 81, and is attached to the bottom mold 71.
It may be balanced on the top surface of the.

After that, the dummy last 81 is removed and the sole 3
is molded and installed in the bottom mold 71, and then, as shown in FIG.
and the mold inner circumferential surface 73a are connected to each other without a step,
The sole of the circumferential wall 11 of the boot body 1 is installed by combining the side mold 73, which is formed so that the outer circumferential surface 30b of the circumferential wall 30 and the mold inner circumferential surface 73a are continuous on the same plane, with the bottom mold 71. A body molding gap 9 is formed in which the outer circumferential surface 11a' of the portion 11a and the exposed outer circumferential surface 11b can be formed without any difference in level (see also FIG. 1).

Next, the injection molded boots A are manufactured by injecting the body molding material (synthetic resin for body molding) into this molding gap from the injection hole 71a.

Note that the sole 3 attached to the bottom mold 71
It is also possible to use one that has been molded in advance using a separate device.

Furthermore, the protrusion 82 allows the dummy last 8 to
In addition to preventing the sole 3 from separating from the bottom mold 71 that occurs when removing the dummy last 81
An air supply means (not shown) is provided for blowing air into the sole molding gap 83, and the air is supplied so that the molded sole 3 remains on the bottom mold 71 side when the dummy last 81 is removed after injection molding. While blowing air from the dummy last 81 side to the sole forming gap 83 side, the dummy last 8
By using the sole manufacturing method of removing the dummy last 81, it is possible to more effectively prevent the sole 3 from separating from the bottom mold 71, which occurs when the dummy last 81 is removed.
(see specification).

As described above, in the injection molded boots of this embodiment, the stepping part 1a and the heel part 1b of the boots body 1 are
A circular protrusion 4, which is a part of the boot body 1 protruding, is disposed on the boot body 1, and the tip surface 41 of the circular protrusion 4 is connected to the sole 3.
The surfaces are aligned and exposed on the ground contact surface 31, and a protrusion floating gap 5 is formed around the circular protrusion 4, while an annular protrusion is formed on the sole side circumferential surface 301 forming the protrusion floating gap 5 of the heel portion 1b. 302, it has anti-slip properties, has a small number of parts, has a simple manufacturing process, can be manufactured at low cost, and can replace the mechanical dummy last with the main body last. This prevents dirt from adhering to the surface of the manufactured shoe sole that separates from the bottom mold, resulting in product contamination, which prevents the production of defective soles and improves the production efficiency of boots. In addition, in this embodiment, since the protrusion floating gap 5 is formed around the circular protrusion 4, the circular protrusion 4 is pushed and bent in the walking direction like a suction cup by walking motion, resulting in a more effective anti-slip effect. It becomes possible to obtain. Furthermore, an annular protrusion 302 protruding from the boot body 1 side of the shoe sole side circumferential surface 301 forming the protrusion movement gap 5 of the heel portion 1b allows the bending of the circular protrusion 4 during walking to be controlled at the origin of the circular protrusion 4. This strengthens the base of the protrusion 4 and improves the anti-slip properties of the heel part 1b, where the heel part 1b is subjected to the most weight during walking. The effect of preventing damage mainly to the base of the protrusion 4 can also be obtained.

Furthermore, the pushing and bending width of the circular protrusion 4 during walking is limited by the protrusion movement limiting cylinder 6 within a range that does not impair the anti-slip function of the protrusion 4, thereby preventing damage to the protrusion 4. In this case, compared to conventional shoe sole molding multiple times, there may be misalignment, bleeding,
No burrs or the like occur.

In addition, it is possible to mechanically replace the dummy last with the main body last, and there is no possibility of product contamination caused by dust adhering to the surface of the manufactured shoe sole that is separated from the bottom mold, which results in defective soles. The production efficiency of boots can be improved.

Furthermore, if the boot body 1 is made of different colors, for example red, and the sole 3 is made of white, for example, a design effect can be imparted to the sole surface, and the shoes are rich in fashion.

In addition, in this embodiment, the exposed outer circumferential surface 11b exposed to the outside of the side wall 11 around the boot body and the sole 3
Since the inner circumferential surface 30a of the circumferential side wall 30 is connected without any step, the sole 3 is installed in a completely fixed state to the boot body 1, and therefore, the injection molded boots A
There is no fear that the sole 3, especially the peripheral edge of the sole 3, will peel off from the boot body 1 even if the boot body 1 is used for a long period of time, and melting and mixing of the boot body 1 and the sole 3 will occur during injection molding of the boot body 1. For this reason, the boots body 1 and the soles 3
Even when different colors are used, there is no risk of color bleeding on the sole installation part 11a of the boot body 1 due to melting and mixing.

Furthermore, in this embodiment shown in FIG.
When the sole 3 is installed in the sole installation part 11a of the boot body 1, the circumferential side wall 30 of the boot body 1
Since the peripheral wall 11 is diagonally cut so that the outer peripheral surface of the sole 3 and the outer peripheral surface 30b of the sole 3 are disposed on the same plane, the injection molded boots A have a good appearance and are easy to walk on.

Furthermore, in the present embodiment shown in FIG. 7, the outer circumferential surface 30b of the thick circumferential side wall 30 protrudes somewhat from the boot body 1, so it has a handmade feel and can also create a high-class image. .

〔Effect of the invention〕

According to the injection molded rain boots of the present invention, the number of parts and work steps are small, and it is possible to manufacture them at low cost.The obtained product has an anti-slip function, and also has a dummy last in the sole manufacturing process of the boots. It is possible to prevent the sole from separating from the bottom mold that occurs when the boots are removed, and if the combination of the boot body and the sole is of a unique color, it is possible to provide a design effect.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 2 is an enlarged view of the X part in FIG. 1, and FIG. 3 is a bottom view of the injection molded boots in FIG. 1. Fig. 4 is an enlarged view of the Y section in Fig. 3, Fig. 5 is an enlarged cross-sectional view of Fig. 3, and Fig. 6 is an enlarged view of the sole state of the injection molded boots of this example when walking. 7 is a central longitudinal sectional view of an injection molded boot in which the circumferential side wall of the sole protrudes from the boot body surface; FIG. 8 is a central longitudinal sectional view of a sole device used in the injection molded boots of the present invention; FIG. 9 is an enlarged view of the Z section of FIG. 8, FIG. 10 is a central vertical sectional view of the injection molded boot manufacturing apparatus of the present invention, and FIGS. 11 and 12 are apparatuses showing a conventional shoe sole manufacturing method. FIG. A... Boots, 1... Boots body, 1b... Heel part,
2...Lining fabric, 3...Sole, 301...Sole circumference,
302...Annular protrusion, 4...Circular protrusion (body protrusion), 5...Protrusion floating gap (floating gap).

Claims (1)

[Scope of Claims] 1. Boots comprising a boot body made of synthetic resin for body molding and a sole made of synthetic resin for sole molding, at least in the treading part and heel part of the sole. An appropriate number of main body protruding parts are arranged,
and a shoe in which the tip surface of the main body protrusion is exposed so as to be substantially aligned with the ground contact surface of the sole, and a floating gap is formed around the main body protrusion, and at least the floating gap is formed in the heel part. Injection molded boots characterized by having an annular protrusion formed on the circumferential surface of the bottom side. 2. The injection molded boots according to claim 1, wherein the boots themselves and the soles have different colors.