JPH106399A - Emboss pattern forming roll and emboss pattern processing device - Google Patents

Abstract

(57) [Problem] To provide an emboss pattern forming roll and an emboss pattern processing apparatus capable of obtaining good mold reproducibility and releasability. An embossing pattern forming roll includes a roll main body having an embossing pattern forming surface, and seal rings attached to both sides of the roll main body.
18A and 18B, the roll body 17 from one seal ring 18A
A through hole 27 is formed in the other seal ring 18B through which the heat medium 35 flows. The seal ring
A groove 34 communicating with a part of the plurality of through holes 27 of the roll body 17 is formed in 18A and 18B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emboss pattern forming roll and an emboss pattern processing apparatus used for manufacturing a film or sheet having an emboss pattern, and can be used, for example, for manufacturing a retroreflective sheet.

[0002]

2. Description of the Related Art In recent years, retroreflective sheets (plastic reflectors) in which the surface of a thermoplastic resin sheet has been subjected to microprism processing have been used in the fields of reflectors, fashion, and construction. It is being used in. In the United States, a glass bead type and a cube corner (cubic corner) type are approved as such retroreflective sheets. In general, the glass bead type is excellent in short distance visibility, and the cube corner type is excellent in long distance visibility and luminance due to light reflection.

In the manufacture of the cube corner type retroreflective sheet, the emboss pattern of the mold for forming the emboss pattern must be accurately transferred to the thermoplastic resin sheet. For this purpose, it is particularly important that the thermoplastic resin sheet is pressed against the mold for forming the emboss pattern with an appropriate pressure, and that the pressed state is maintained for a predetermined time.

Conventionally, as a method for producing a retroreflective sheet which meets such requirements, for example, a continuous pressing method (Japanese Patent Publication No.
-56103) and the belt method (Japanese Patent Publication No. 5-17223).
A roll method (an embodiment according to FIG. 9 of Japanese Patent Publication No. 3-43051) has been proposed. The continuous pressing method is a method in which a plurality of pressing means having a heating or cooling function sequentially presses a die for forming an embossed pattern against a solid sheet material which is continuously supplied while being superimposed on a belt. Is transferred to a sheet. The belt method is a manufacturing method in which a belt having an embossed pattern mold and a thermoplastic resin sheet are sandwiched between a pair of rollers and pressed to transfer the mold to the sheet. The roll method is a manufacturing method in which a mold is transferred to a sheet using a roll having an embossed pattern formed on an outer peripheral surface.

[0005] However, according to the continuous pressing method, the production speed is slow, and the apparatus is complicated and large. According to the belt method, since the belt itself has an emboss pattern, the size of the apparatus is increased, and there is a problem in the durability of the belt as a mold. According to the roll method, the production speed is high and the durability is good. However, it is not possible to efficiently control the temperature of the sheet at the time of mold transfer and the temperature of the sheet at the time of peeling the transferred sheet from the roll. There was a problem. That is, because the structure on the side of the roll on the mold transfer side and the part on which the sheet of the roll is peeled off cannot be provided with a large temperature difference,
As a result, good mold reproducibility and peelability were not obtained.

Accordingly, an object of the present invention is to provide an emboss pattern forming roll and an emboss pattern processing apparatus which can obtain good mold reproducibility and releasability.

[0007]

A roll for forming an embossed pattern according to a first aspect of the present invention comprises a roll body having an embossed pattern forming surface, and seal rings respectively attached to both sides of the roll body. A flow path in which a heat medium flows from one seal ring through the roll body to the other seal ring is formed in the roll body and each seal ring.

As the heat medium, any one such as water, silicone oil, oil for temperature control and the like can be used. According to the present invention, a flow path of a heat medium is formed in a roll main body along a portion where temperature control of the roll main body needs to be performed, and a heat medium having an appropriate temperature is passed through the flow path to transfer a mold of a roll. The required temperature difference can be provided between the side portion and the portion where the sheet of the roll is peeled off.

[0009] Such a temperature difference may be appropriately set, and is, for example, 10 ° C or more, preferably 20 ° C or more. 10 ℃
If it is smaller, a satisfactory transfer state cannot be obtained due to insufficient cooling during peeling. There is no particular upper limit,
For example, the temperature is preferably 150 ° C. or lower. If the temperature is higher than 150 ° C., the durability of the roll is deteriorated, and the production speed is reduced, resulting in an increase in cost. Further, by continuously flowing a heat medium having a constant temperature from one seal ring through the roll body to the other seal ring, it is possible to accurately control the temperature of the roll body.

According to a second aspect of the present invention, there is provided the roll for forming an embossed pattern according to the first aspect, wherein the flow path of the roll body is formed by a plurality of through holes formed along the vicinity of the outer peripheral surface of the roll body. There is a feature.

The diameter of the through-holes and the number of the through-holes are arbitrary, and are set so that the temperature of the roll body that needs to be controlled by the heat medium flowing through these through-holes can be controlled efficiently. do it. The appropriate diameter of the through-holes and the appropriate number of through-holes can also vary depending on the size of the roll. When the through hole is circular, the inside diameter is arbitrary, but for example, about 1 mm to 100 mm is appropriate.
Although it depends on the temperature of the heat medium, if it is smaller than 1 mm, a sufficient flow rate cannot be obtained. Conversely, if it exceeds 100 mm, the amount of the heat medium remaining in the through-holes increases, so that the heating efficiency when the sheet is rotated from the peeling side to the die transfer side of the roll is deteriorated.

According to a third aspect of the present invention, there is provided an embossing pattern forming roll according to the second aspect, wherein the seal ring has a groove portion communicating with a part of the plurality of through holes of the roll body. It is characterized by being.

For example, when the portion of the roll main body that needs to be temperature-controlled has an angle of θ ° from the center of the roll main body, the groove is formed so that the heat medium flows through the through hole included in the θ °. May be formed. This θ ° depends on the mold transfer speed, and is not particularly limited. However, if it is too small, sufficient temperature control cannot be obtained. If the temperature is too large, it is difficult to control the other temperature when cooling and heating are performed simultaneously.

According to a fourth aspect of the present invention, there is provided the roll for forming an embossed pattern according to the third aspect, wherein the seal ring has a plurality of flow paths through which a plurality of heat mediums having different temperatures flow. A plurality of grooves communicating with the plurality of flow paths are formed.

A roll for forming an embossed pattern according to a fifth aspect of the present invention is the roll according to the fourth aspect, further comprising a seal ring formed with two flow paths through which two heat carriers flow and a groove. Is a heat medium for cooling, and the other flow path and the groove are made of a heat medium for heating.

By providing a flow path and a groove for a heating medium for heating at a portion of the seal ring on the side of the mold transfer side, and providing a flow path and a groove for a heating medium for cooling at a part where the sheet of the roll is peeled off. It becomes possible to provide a large temperature difference necessary for improving mold reproducibility and peelability.

According to a sixth aspect of the present invention, there is provided the roll for forming an embossed pattern according to any one of the first to fifth aspects, wherein
The roll body is an outer cylinder having an embossed pattern forming surface, a middle cylinder having the flow path and fitted inside the outer cylinder, and being fitted inside the middle cylinder. An inner cylinder member, wherein the middle cylinder member has a linear expansion coefficient larger than a linear expansion coefficient of the outer cylinder member, and an inner peripheral surface of the middle cylinder member is an outer peripheral surface of the inner cylinder member. It is characterized in that it is formed in a tapered shape having the same angle as that of.

By heating while the above-mentioned middle cylinder is inserted into the outer cylinder, both cylinders are tied together based on the difference in thermal expansion coefficient between these cylinders. In addition, the inner cylinder is inserted into the outer cylinder when the middle cylinder is inserted into the outer cylinder, and the inner cylinder is inserted into the middle cylinder in a state where the inner cylinder is heated and expanded. It will be integrated.

The roll for forming an embossed pattern according to the seventh invention of the present invention is the roll according to any one of the first to sixth inventions,
The emboss pattern is a cube corner type.

An embossing pattern processing apparatus according to an eighth aspect of the present invention includes the embossing pattern forming roll according to any one of the first to seventh aspects, and a rotary shaft for rotating the roll main body is provided on a roll main body of the roll. And the rotating shaft penetrates the seal ring.

That is, at the time of emboss pattern processing,
Only the roll body rotates, and the seal ring is in a fixed state. Therefore, the roll body rotates and the heat medium flows only through the through-hole of the roll body that is in communication with the groove of the seal ring.

In the embossing pattern processing apparatus according to a ninth aspect of the present invention, in the eighth aspect, a heating means for heating a part of the roll before the mold transfer is provided near the embossing pattern forming roll. It is characterized by having been done.

A specific example of the heating means is arbitrary such as an infrared heater. With this external heating means, the portion of the roll on the mold transfer side can be efficiently heated. The resin of the sheet to be processed by the embossing pattern processing apparatus according to the present invention is arbitrary as long as it is a thermoplastic resin. When used as a plastic reflector, amorphous resin, especially polyvinyl chloride, polycarbonate,
Acrylic resin or the like is preferable because it has high transparency and the emboss pattern is not easily deformed even when contracted.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] An emboss pattern processing apparatus 12 having an emboss pattern forming roll 11 according to the present embodiment will be described with reference to FIGS. As shown in FIG. 1, the emboss pattern processing apparatus 12 includes an emboss pattern forming roll 11, an elastic roll 14 for assisting mold transfer to a thermoplastic resin sheet 13, and a mold transferred thermoplastic resin sheet.
A roll 15 for peeling off the roll 13 and a heating means 16 for externally heating the roll 11 for forming the emboss pattern are provided.

As shown in FIGS. 2 to 5, the roll 11 for forming an emboss pattern includes a roll body 17 and seal rings 18A and 18B attached to both sides of the roll body 17. is there. The roll body 17 includes an outer cylinder 19, a middle cylinder 21 fitted inside the outer cylinder 19, and an inner cylinder 22 fitted inside the middle cylinder 21. As shown in FIGS. 6 and 7, a mold 23 for forming an emboss pattern on the thermoplastic resin sheet 13 is formed on the surface of the outer tubular member 19. This mold 23 is a cube-corner type triangular pyramid diamond cut pattern.

The middle tubular member 21 has one open end 24 and the other open end 24.
Notches 25 are formed on the outer peripheral surfaces of A and 24B to be fitted with the seal rings 18A and 18B, respectively, and female screws 26 are cut on the inner peripheral surface of one open end 24A. Further, the inner peripheral surface of the middle cylindrical member 21 extends from one open end 24A to the other open end 24B.
It is formed in a tapered shape whose diameter increases toward. A plurality of circular through-holes 27, which are flow paths for the heat medium, are formed at regular intervals inside the middle cylindrical member 21 along the vicinity of the outer peripheral surface thereof. The coefficient of linear expansion of the material of this middle cylinder 21 is
It is larger than the linear expansion coefficient of the outer cylinder member 19.

The inner cylindrical member 22 has an outer peripheral surface formed in a tapered shape whose diameter increases from one open end 24A to the other open end 24B. The angle of this taper matches the angle of the taper formed on the inner peripheral surface of the middle cylinder 21. A male screw 28 is cut out on the outer peripheral surface of the one open end 24B. The inside of the inner cylindrical member 22 is hollow. The roll body 17 is configured such that the middle cylindrical member 21 is
Heated in the state of being inserted into the inside, and expanded by heating
When the inner cylinder 22 is screwed into the cylinder 21, the two cylinders 21 and 22 are tightened based on the difference in the coefficient of thermal expansion between the cylinders 21 and 22. Tube material 21 and inner tube material 22
Can be integrated and assembled.

A hollow rotary shaft 29 is connected to the inner cylindrical member 22 so that the hollow portions of the inner cylindrical member 22 and the rotary shaft 29 are in communication with each other. At the time of emboss pattern processing,
A heat medium flows through these hollow portions. As shown in FIG. 5, the seal rings 18A and 18B
29 has a hole portion 31 therethrough, and a circular recess 32 fitted on the cutout portion 25 of the middle cylinder member 21 on a surface to be mounted on the roll body 17.
A hole 33 serving as a flow path of the heat medium is formed between the recess 32 and the outer surface. In the recess 32, a groove 34 communicating with the hole 33 is provided.
Are formed in a circumferential shape.

The groove 34 has a size such that when the seal rings 18A and 18B are mounted on the roll body 17, the grooves 34 communicate with some through holes 27 that are a part of the plurality of through holes 27 of the roll body 17. Is formed. That is, the temperature control of the roll body 17, for example, the part that needs to be cooled
When the angle from the center is θ °, a groove portion 34 having a size such that the heat medium flows into some through holes 27 included in the θ ° may be formed. Since the cooling heat medium 35 flows through the plurality of through-holes 27 communicating with the grooves 34, the portion where the cooling heat medium 35 flows is located at the position where these through-holes 27 are peeled off the sheet 13 of the roll body 17. Become a part.

The elastic roll 14 has a surface coated with an elastic material 36 such as silicone rubber. The elastic member 36 has a thickness of 1 mm to 50 mm. The elastic roll 14 is provided at the point of introduction of the thermoplastic resin sheet 13 into the roll 11 for forming an emboss pattern so as to contact the roll 11 via the sheet 13. The peeling roll 15
Is provided on a portion of the emboss pattern forming roll 11 where the sheet 13 is peeled off, so as to be in contact with the roll 11 via the sheet 13. The peeling roll 15 is located substantially behind the embossing pattern forming roll 11 with respect to the elastic roll 14. The heating means 16 includes an infrared heater. This heating means 16 is provided between the elastic roll 14 and the peeling roll 15 along the outer peripheral surface of the roll main body 17 so that the roll main body 17 of the portion where the mold transfer to the sheet 13 is performed is sufficiently heated. Is provided.

Using the embossing pattern processing device 12, an embossing pattern is processed on the thermoplastic resin sheet 13 as follows. As shown in FIGS. 1 to 3, in a state where the roll body 17 is rotating and the heating means 16 is heating the surface of the roll body 17, the cooling heat medium 35 is passed through the roll body 17 from one seal ring 18 </ b> A to the other. Continuously flows through the seal ring 18B. The thermoplastic resin sheet 13 introduced between the roll main body 17 and the elastic roll 14 is softened by the heated roll main body 17 and the elastic roll 14 having the elastic material 36 is provided.
Presses the sheet 11 against the outer cylinder
Transfer 19 emboss patterns.

The sheet 13 continuously supplied and transferred with the mold
Reaches the back side of the roll body 17 with the rotation of the roll body 17. In the roll body 17, the heat medium 35 flowing into the groove 34 of the one seal ring 18A continuously flows through the plurality of through-holes 27 of the roll body 17 that is in communication with the groove 34, and then continues to the other side. Seal ring 18B Groove 34
Is discharged through. In the plurality of through holes 27 located at the portion of the roll body 17 where the sheet 13 is separated, the cooling heat medium 35 having a predetermined temperature is continuously flowing, so that the separated portion of the sheet 13 is efficiently cooled. . Then, the sheet 13 cooled by the cooling heat medium 35 is peeled off from the roll main body 17 by the peeling roll 15 to obtain the sheet 13 on which the emboss pattern is formed.

It should be noted that the seal ring 18A,
In FIG. 18B, the groove 34 is formed at one place in the concave portion 32. However, as shown in FIG. 8, in addition to the groove 34, the groove 37 is formed along the portion of the roll body 17 where the mold transfer is performed. May be another seal ring 38 formed. A hole 39 serving as a passage for the heat medium 35 is formed so as to communicate with the groove 37.

In the embossing pattern processing apparatus 12 using the seal ring 38, the heating medium 35 flows through the plurality of through holes 27 along the portion where the mold transfer is performed, and the roll body at the portion where the mold transfer is performed While heating 17, a cooling heat medium 35 is caused to flow through a plurality of through holes 27 along the portion where the sheet 13 is peeled, thereby cooling the roll body 17 in the portion where the sheet 13 is peeled. Also in this processing device 12,
The heating means 16 is provided similarly to the above-mentioned device. According to the processing apparatus 12, in addition to the heating of the roll body 17 at the portion where the mold transfer to the sheet 13 is performed by the heating means 16, the roll body at the portion where the mold transfer is performed by the cooling heat medium 35 Since sheet 17 is heated, sheet 13 required for mold transfer
Can be efficiently heated.

[0035]

EXAMPLE In the above embodiment, a cube corner type emboss pattern was formed on the thermoplastic resin sheet 13 under the following conditions of the apparatus and processing. The outer tubular member 19 is formed by welding short sides of a rectangular nickel flat plate (thickness: 0.6 mm) by argon welding. The inner diameter at room temperature is 143.1 mm, and the surface length (length in the direction along the center axis of the roll) is 220 mm. The middle cylinder 21 is made of aluminum (505
2) Made at room temperature, outer diameter is 142.8mm, surface length is 250mm
The inside diameter of one open end is 110.25 mm, the inside diameter of the other open end is 119 mm, and the taper is 1 degree.

The inner cylindrical member 22 is made of stainless steel (SS41), and at room temperature, the outer diameter of one open end is 110.55 mm, the outer diameter of the other open end is 119.3 mm, the inner diameter is 50 mm, and the surface length is 250 mm. ,
The taper is 1 degree. The through holes 27 have an inner diameter of 8 mm and are formed at equal intervals of 1 mm along the vicinity of the outer peripheral surface of the middle cylindrical member 21. The cooling heat medium 35 is a silicone oil. The seal rings 18A and 18B have a diameter of 150 mm and a thickness of 15 mm.
The angle θ from the center of the groove 34 is 180 degrees, and the width of the groove 34 is 10 mm
It is.

The diameter of the emboss pattern forming roll 11 is
The diameter of the elastic roll 14 and the peeling roll 15 is 150 mm, and the diameter thereof is 50 mm. The elastic material 36 is made of silicone resin and has a hardness (JI
SK6301 Type A) is 60 degrees. The transfer pressure during mold transfer is 100 N / cm. The processing speed is 1 m / min.
The thermoplastic resin sheet 13 is made of polyvinyl chloride having a polymerization degree of 1300 and containing 50% by weight of a plasticizer (DOP: di-2-ethylhexyl phthalate).

In the emboss pattern processing according to the present embodiment, the temperature of the roll 11 at the portion where the mold of the emboss pattern forming roll 11 is transferred is 130 ° C., while the roll 11 at the portion where the sheet 13 is peeled off. Was 60 ° C. Therefore, according to the present embodiment, since the emboss pattern processing apparatus 12 including the emboss pattern forming roll 11 is used, the roll 11 necessary for obtaining good mold reproducibility and releasability is required. It was possible to provide a temperature difference between the part on the mold transfer side and the part of the roll 11 from which the sheet 13 was peeled off.

On the other hand, for comparison, when the emboss pattern processing was performed without flowing the cooling heat medium 35 into the emboss pattern forming roll 11, the portion of the roll 11 on the mold transfer side and the sheet 13 of the roll 11 were separated. Since the temperature difference from the portion to be formed was not sufficient, good mold reproducibility and peelability could not be obtained.

[0040]

According to the emboss pattern forming roll and the emboss pattern processing apparatus of the present invention, the flow of the heat medium flowing from one seal ring through the roll body to the other seal ring is performed. Since the path is formed, good mold reproducibility at the time of mold transfer and good peelability at the time of peeling are obtained.

[Brief description of the drawings]

FIG. 1 is a front view of an emboss pattern processing apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of an emboss pattern forming roll according to the embodiment.

FIG. 3 is a perspective view of a roll body according to the embodiment.

FIG. 4 is an exploded sectional view of the emboss pattern forming roll according to the embodiment.

FIG. 5 is a perspective view of a seal ring according to the embodiment.

FIG. 6 is a front view of a mold formed on the outer tubular member.

FIG. 7 is a sectional view taken along line AA of FIG. 6;

FIG. 8 is a perspective view of another embodiment of the seal ring.

[Explanation of symbols]

 11 Emboss pattern forming roll 12 Emboss pattern processing device 13 Thermoplastic resin sheet 16 Heating means 17 Roll body 18A, 18B, 38 Seal ring 19 Outer cylinder 21 Middle cylinder 22 Inner cylinder 27 Holes 33,39 Holes that serve as flow paths for seal ring 34,37 Grooves for seal ring 35 Heat medium 36 Elastic material

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B29K 33:18 69:00 105: 32 B29L 11:00

Claims (9)

[Claims] 1. A roll body having an embossed pattern forming surface, and seal rings respectively attached to both sides of the roll body, wherein the roll body and each seal ring pass from one seal ring through the roll body. A roll for forming an emboss pattern, wherein a flow path through which a heat medium flows is formed in the other seal ring. 2. The emboss pattern forming roll according to claim 1, wherein the flow path of the roll body is a plurality of through holes formed along the vicinity of the outer peripheral surface of the roll body. 3. The emboss pattern forming roll according to claim 2, wherein the seal ring is formed with a groove communicating with a part of the plurality of through holes of the roll body. 4. A plurality of flow passages through which a plurality of heat mediums having different temperatures flow are formed in the seal ring, and a plurality of grooves respectively communicating with the plurality of flow passages are formed in the seal ring. The roll for forming an embossed pattern according to claim 3, wherein: 5. A seal ring having two flow paths through which two heat mediums flow and a groove formed therein, one of the flow paths and the groove being a heat medium for cooling, and the other flow path and the groove being heated. The embossing pattern forming roll according to claim 4, wherein the roll is a heating medium. 6. The roll main body includes an outer cylinder having an embossed pattern forming surface, a middle cylinder having the flow path and fitted inside the outer cylinder, and an inside of the middle cylinder. An inner cylindrical member fitted to the inner cylindrical member, wherein the middle cylindrical member has a linear expansion coefficient larger than a linear expansion coefficient of the outer cylindrical member, and an inner peripheral surface of the middle cylindrical member is The emboss pattern forming roll according to any one of claims 1 to 5, wherein the roll is formed in a tapered shape having the same angle as the outer peripheral surface of the cylindrical member. 7. The emboss pattern forming roll according to claim 1, wherein the emboss pattern is a cube corner type. 8. A roll for forming an emboss pattern according to any one of claims 1 to 7, wherein a rotation shaft for rotating the roll body is connected to a roll body of the roll, and the rotation shaft connects the seal ring. An embossing pattern processing device characterized by being penetrated. 9. The emboss pattern processing according to claim 8, wherein a heating means for heating a part of the roll before the mold transfer is provided near the emboss pattern forming roll. apparatus.