JPH10235733A - Thermoplastic resin sheet working apparatus, sheet working method, and its sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermoplastic resin sheet working apparatus which can produce sheets stably by setting a large temperature difference between a transfer part and a peel part, a sheet working method, and the sheet. SOLUTION: A sheet working apparatus 1 is constituted by including a heating means 50 for heating a stamper roll 21 externally and a cooling means 70 for cooling a thermoplastic resin 10 after transfer, and a heat insulating material 23 is placed between rolls 21, 22. Accordingly, in a transfer part 20A, the roll 21 is heated efficiently by the heating means 50 to high temperatures, while in a peel part 20B, the resin 10 after transfer and the roll 21 are cooled efficiently by the cooling means 70 to low temperatures. In this way, a large temperature difference is generated between the transfer part 20A and the peel part 20B to produce sheets stably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet processing apparatus and a sheet processing method for a thermoplastic resin, and to a precision embossed sheet for optical use such as a reflector, a prism sheet, and a Fresnel lens.

[0002]

BACKGROUND ART In recent years, retroreflective sheets (plastic reflectors) in which the surface of a thermoplastic resin has been subjected to microprism processing have been used in the fields of reflectors, fashion, architecture, and the like. . In the manufacture of such a retroreflective sheet, a mold for forming an embossed pattern must be accurately transferred to a thermoplastic resin. For that purpose, it is particularly important that the thermoplastic resin 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.

As a method for producing a retroreflective sheet which meets such requirements, for example, a continuous pressing method (Japanese Patent Publication No.
No. 56103) and the belt method (Japanese Patent Publication No. 3-4)
An embodiment according to FIGS. 7 and 8 of JP-A-3051 is proposed.

In the continuous pressing method, a solid-state sheet material that is continuously supplied while being superposed on a belt is used.
This is a manufacturing method in which dies for emboss pattern formation are sequentially pressed by a plurality of pressing means having a heating or cooling function to transfer the dies to a sheet. The belt method is a manufacturing method in which a belt having an embossed pattern mold and a thermoplastic resin are sandwiched between a pair of rollers and pressed to transfer the mold to the thermoplastic resin.

On the other hand, according to the press method, since the step of pressing the mold is performed in a batch system, there are disadvantages that the production speed is low and the apparatus is complicated and large. Also,
According to the belt method, since a mold is formed on the belt,
Due to the low durability of the belt, there was a limit to increasing the production speed. Also in this method, there is a drawback that more than one pair of rolls for winding the belt is required, and that each roll must be arranged apart from each other, which increases the size of the apparatus.

Therefore, conventionally, the roll method (Japanese Patent Publication No.
An embodiment according to FIG. 9 of Japanese Patent No. 43051 is also proposed. In this roll method, since the mold is transferred to a thermoplastic resin using a roll having an embossed pattern mold formed on the outer peripheral surface, unlike the conventional batch method, production can be continuously performed at a high speed. Since the belt on which is formed is not required, the durability is good, the structure of the apparatus can be simplified, and the apparatus can be downsized.

[0007]

In the roll method, in order to prevent insufficient filling of the thermoplastic resin into the mold and poor peeling from the roll, the roll is heated to a high temperature in a portion where transfer is performed, and peeling is performed. In some parts, it is necessary to cool the thermoplastic resin or roll to a low temperature. However, in the conventional roll method, the structure in which such a temperature difference is provided is not sufficient for performing stable production, and a solution has been desired.

An object of the present invention is to provide a sheet processing apparatus and a sheet processing apparatus for a thermoplastic resin capable of stably producing a sheet by providing a large temperature difference between a part on a mold transfer side of a roll and a part on a release side of the thermoplastic resin. It is an object of the present invention to provide a method and a sheet obtained by the sheet processing apparatus and the sheet processing method.

[0009]

According to the present invention, there is provided a sheet processing apparatus for a thermoplastic resin, comprising a stamper roll having a mold for transfer to the thermoplastic resin, and a support rotatably disposed in the stamper roll. Roll, a heat insulating member interposed between the stamper roll and the support roll,
Heating means provided so that the stamper roll can be heated from the outside, and cooling means provided so that the thermoplastic resin attached to the stamper roll can be cooled from the outside at a position different from the heating means. It is characterized by having been done.

According to the processing apparatus of the present invention, at the position where the heating means is arranged, the temperature of the stamper roll is raised by the heating means, and at the position where the cooling means is arranged, the mold transfer is performed by the cooling means. The temperature of the later thermoplastic resin is lowered. At this time, the surface of the stamper roll (the surface on which the mold is formed) is easily heated from the outside by the heating means, and is insulated by the heat insulating member with respect to the support roll. The applied heat is not transmitted to the support roll and diffused, and the surface of the stamper roll is instantaneously and efficiently heated to a high temperature. Further, the temperature of the thermoplastic resin itself is efficiently and instantaneously lowered by being cooled by the cooling means from the outside.

As a result, a large temperature difference occurs between the heated portion of the stamper roll and the cooled portion of the thermoplastic resin. Therefore, mold transfer is performed on the heated stamper roll to cool the thermoplastic resin. If peeling is performed later, insufficient filling of the resin into the mold, poor peeling, and the like are prevented, and the sheet can be stably produced.

Although the specific resin type of the thermoplastic resin is arbitrary, when used as a plastic reflection plate, a crystalline resin such as polypropylene (PP), polyethylene terephthalate (PET), or polyvinyl chloride is used. An amorphous resin such as (PVC), polycarbonate (PC), and acrylic resin (PMMA or the like) is used.

Further, in the sheet processing apparatus of the present invention, another transfer means having another mold for transfer is provided, and the transfer means is opposite to the surface of the thermoplastic resin transferred by the stamper roll. The transfer may also be performed on the surface. In such a case, since a transfer unit having another mold is provided, the transfer is performed on both surfaces of the sheet by the transfer unit and the stamper roll.

At this time, as the mold of the cylindrical body and the transfer means, a mirror-like or embossed-surface type is applied. When the mold is made into a mirror-like shape, a glossy surface is transferred to a sheet, and the embossed surface is formed. In this case, optical retroreflectivity is imparted to the sheet.

When the mold is embossed, it is preferable that the embossed surface be a cube corner type, so that the retroreflective sheeting is excellent in long-range visibility and brightness due to light reflection. Can be obtained.

The sheet processing method for a thermoplastic resin according to the present invention is a method for processing a sheet using the above-described sheet processing apparatus. Specifically, a mold for transfer to a thermoplastic resin is formed. Heating means for disposing a supporting roll rotatable in a predetermined rotation direction in the stamper roll, interposing a heat insulating member between the stamper roll and the supporting roll, and heating the stamper roll,
Cooling means for cooling the thermoplastic resin attached to the stamper roll at a different position from the heating means is arranged,
After supplying the thermoplastic resin to the front side in the rotation direction with respect to the position where the heating means is provided, the mold of the stamper roll is transferred to the thermoplastic resin, and the transferred thermoplastic resin is cooled by the cooling means. It is characterized in that it is peeled off from the stamper roll, and the same effect as described above can be obtained.

Further, the thermoplastic resin sheet of the present invention comprises:
It is obtained by the above-described sheet processing apparatus and sheet processing method.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment First, a sheet processing apparatus 1 according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the sheet processing apparatus 1 performs mold transfer to a thermoplastic resin 10 supplied in a molten state from a T-die molding machine 80, and includes an emboss pattern forming roll 20,
A nip roll 30 for transferring a pattern by pressing the thermoplastic resin 10 against a roll 20 via an endless belt 44 described later, and a transfer unit for glazing (glossing) the surface opposite to the surface of the thermoplastic resin 10 on which the mold is transferred. A heating means 50 disposed outside the roll 20 for heating the roll 20;
A heat shield plate 60 for shielding the transfer unit 20A and the peeling unit 20B of the zero from the heating unit 50; and a cooling unit 70 for cooling the thermoplastic resin 10 after transfer at a position different from the position where the heating unit 60 is installed. It has. In addition, as described later, in the present embodiment, the nip roll 30 constitutes a part of the glossing means 40.

As shown in FIG. 2, the emboss pattern forming roll 20 includes a cylindrical stamper roll 21 and
Support roll 2 arranged in this stamper roll 21
2 and a heat insulating member 23 interposed between the stamper roll 21 and the support roll 22. The concave portions of the holding members 25 provided at both ends by integrating the rolls 21, 22 and the heat insulating member 23 are provided. 25A is fitted and held.

As shown in FIGS. 3 and 4, the surface of the stamper roll 21 is a mold 24 for forming an embossed pattern on the thermoplastic resin 10. This mold 24
Is a cube corner triangular pyramid diamond cut pattern. The thickness (single-wall thickness) of such a stamper roll 21 varies depending on the embossed shape and is not limited, but is preferably 0.1 to 5.0 mm. If the thickness is 0.1 mm or less, there is a problem in durability, and the thickness is 5.0 mm.
This is because the heating and cooling efficiency is deteriorated in the above.

In FIGS. 1 and 2, the support roll 22 is
The inside thereof is hollow, and each holding member 25
Is provided, and the inside of the support roll 22 and the inside of the rotating shaft 26 are in communication with each other. At the time of emboss pattern processing, a cooling medium is flowed through those hollow portions as necessary, and the support roll 22 itself is also cooled. Note that, as the support roll 22, a roll of an internal taper type including an inner cylinder member and an outer cylinder member may be used.

The support roll 22 is provided with a rotating shaft 26.
Is provided so as to be rotatable in the direction of an arrow (FIG. 1) around
The stamper roll 21 also rotates simultaneously with the support roll 22 via the heat insulating member 23. In addition, on the support roll 22, the above-described transfer unit 20 </ b> A is set on the front side (the front side with respect to the rotation direction of the support roll 22 indicated by the arrow) of the portion heated by the heating unit 60, and On the front side of the portion to be cooled, the above-described peeling portion 20B is set.

The transfer section 20A is maintained at a high temperature by the stamper roll 21 being heated by a heating means 50 described later. The temperature Te of the transfer portion 20A differs depending on the thermoplastic resin 10 to be used and the temperature of the resin 10 itself at the time of transfer, and is not limited, but the thermoplastic resin 10 completely flows into the mold 24. Set above temperature.

Specifically, when the thermoplastic resin 10 is a crystalline resin, Te is equal to or higher than the melting point (mp) of the resin 10, and is preferably equal to or higher than mp + 10 ° C. When the thermoplastic resin 10 is an amorphous resin, Te is the same as that of the resin 1.
A glass transition temperature (Tg) of 0 or more, preferably
Tg + 10 ° C. or higher, more preferably Tg + 20 ° C. or higher. If Te is lower than these temperatures, the filling of the thermoplastic resin 10 into the mold 24 will be poor.

The release section 20B is maintained at a low temperature by cooling the stamper roll 21 by the cooling means 70 via the thermoplastic resin 10 after transfer and the endless belt 44 (described later). Then, the temperature Th of the peeling section 20B
Similarly, the temperature is set to a temperature at which the embossed shape is not deformed at the time of peeling from the stamper roll 21.

Specifically, when the thermoplastic resin 10 is a crystalline resin, Th is a temperature lower than the mp of the resin 10, preferably a temperature lower than mp-10 ° C., more preferably mp- The temperature is lower than 20 ° C. Also,
When the thermoplastic resin 10 is an amorphous resin, Th is T
The temperature is lower than g-10C. When Th is higher than these temperatures, the embossed shape loses shape.

When it is difficult to set Te and Th as described above, each of Te and Th is determined by the temperature difference Te−Th.
May be set so as to be surely obtained. Specifically, Te-Th is preferably a temperature higher than 10C, more preferably a temperature higher than 20C.

The heat insulating member 23 constituting the emboss pattern forming roll 20 has a heat insulating property such as rubbers such as silicone rubber, fluorine rubber, urethane rubber and natural rubber, glass fiber, asbestos, water and oil. The material is not limited.

The nip roll 30 has a surface coated with an elastic material 31 such as silicone rubber. The elastic material 31 is not limited, but is thick (single-walled).
The size is 1.0 to 50.0 mm. Such a nip roll 30 is provided so as to press the thermoplastic resin 10 against the roll 20 in the transfer section 20A.

The glazing means 40 includes the nip roll 30 described above, a cooling roll 42 disposed near the peeling portion 20B of the emboss pattern forming roll 20, and a roll 20.
Meandering adjustment roll 43 arranged at a position away from the
And a metal endless belt 44 wound around each of the rolls 30, 42, 43. Appropriate temperature control means (not shown) is incorporated in the cooling roll 42 to cool the endless belt 44. Further, the meandering adjustment roller 44 suppresses meandering of the endless belt 44.

The endless belt 44 is configured such that, between the rolls 30 and 42, the back surface of the thermoplastic resin 10 (the surface opposite to the surface to which the transfer is performed at the transfer portion 20A) is the roll 2
0 between the transfer unit 20A and the peeling unit 20B.
And is to be done between. The surface of the endless belt 44 is a mirror surface having a surface roughness of 3S or less, and another die according to the present invention is formed at the mirror surface portion. That is, the rear surface of the thermoplastic resin 10 is glazed at the mirror surface of the endless belt 44.

The heating means 50 is composed of an infra-stein heater, a halogen heater, an IR heater, a burner heater, and the like. What kind of means is used depends on the specifications of the processing apparatus 1 and the thermoplastic resin. It may be determined in consideration of ten specific resin types and the like.

The shielding plate 60 has a heat insulating effect, such as a metal plate made of aluminum or stainless steel, or a heat insulating member wound around such a metal plate. It is provided continuously along the direction. Note that the shielding plate 60 is not essential to the present invention, and can be omitted as appropriate in implementing the present invention.

The cooling means 70 is a heat exchanger as shown in FIG. 7 and includes a main body 71 having an opening 71A on a surface facing the endless belt 44 (FIG. 1).
An inlet 72 (open arrow side) and an outlet 73 (black arrow side) are provided at both end sides of the unit 1, and a fin-shaped seal made of, for example, rubber (not shown) is provided at the four peripheral edges of the opening 71 </ b> A. Lumber is attached. That is, in the cooling means 70, the opening 71A side of the main body 71 is pressed against the endless belt 44 via the sealing material,
A cooling medium such as water or oil whose temperature has been adjusted is supplied to the inlet 72,
By flowing into and out of the main body 71 through the outlet 73 and directly contacting the endless belt 44, heat exchange is performed between the cooling medium and the thermoplastic resin 10 (FIG. 1). As a cooling medium inflow / outflow method, a negative pressure method is preferably used in order to enhance the shielding effect.

Next, a processing procedure of the thermoplastic resin 10 when the sheet processing apparatus 1 is used will be described. As shown in FIGS. 1 and 2, a support roll 22 is provided inside a stamper roll 21.
And a heat insulating member 23 is interposed between the rolls 21 and 22, and these are integrally held by a holding member 25 to assemble the emboss pattern forming roll 20.
Then, the sheet processing apparatus 1 is configured by installing the glazing means 40 provided with the nip roll 30, the heating means 50, the cooling means 70 and the like around the roll 20.

Then, in the processing apparatus 1, the support roll 22 (stamper roll 21) is rotated, the endless belt 44 is rotated, and the stamper roll 21 is heated by the heating means 50 to maintain the transfer section 20A at a high temperature. At the same time, cooling means 7
It can be cooled at 0.

Next, the thermoplastic resin 10 is continuously supplied to the high-temperature transfer section 20A so as to reliably maintain the molten state. In this state, the nip roll 30 having the elastic material 31 is pressed against the thermoplastic resin 10 in a planar manner. Transfer the emboss pattern. Thereafter, the thermoplastic resin 10 on which the mold transfer has been performed is moved together with the rotation of the stamper roll 21, and the thermoplastic resin 10 is pressed by the endless belt 44 over substantially the entire area from the transfer portion 20 </ b> A to the peeling portion 20 </ b> B, and a mirror surface is formed on the back surface. Transfer and gloss. Further, the thermoplastic resin 10 is cooled by the cooling means 70, and thereafter the thermoplastic resin 10 is
Peel at 0B. Thus, the thermoplastic resin 1 becomes the embossed sheet 10 'on which the embossed patterns 24' shown in FIGS. 6 and 7 are formed.

According to the present embodiment, the following effects can be obtained. That is, since the sheet processing apparatus 1 is provided with the heating means 50, the stamper roll 21
Can be heated. At this time, stamper roll 2
1 is insulated from the support roll 22 by the heat insulating member 23, and since the surface mold 24 is easily heated from the outside by the heating means 50, the heat from the heating means 50 is transmitted and diffused to the support roller. , Stamper roll 21
Can be efficiently and instantaneously heated to a high temperature.

Since the processing device 1 is provided with a cooling means 70 for cooling the thermoplastic resin 10 from the outside,
The temperature of the thermoplastic resin 10 after the mold transfer can be reliably lowered to a low temperature via the endless belt 44.
Also, the temperature of the stamper roll 21 can be easily lowered to a low temperature.

As described above, the stamper roll 21
Is reliably maintained at a high temperature, and the temperature Th of the peeling section 20B and the temperature of the thermoplastic resin 10 itself at the peeling section 20B are also reliably maintained at a low temperature. The temperature difference of the stamper roll 21 and the temperature difference of the thermoplastic resin 10 can be significantly increased, so that the transfer to and separation from the thermoplastic resin 10 can be performed favorably, and the production of the sheet 10 ′ can be performed stably. Can be.

Since the heating means 50 heats the stamper roll 21 from the outside, the heating means 50 can more efficiently heat the mold 24 formed on the surface of the stamper roll 21, and is supplied from the T-die molding machine 80. Thermoplastic resin 1
0 can be maintained in a satisfactory state, and the insufficient filling of the mold can be more reliably prevented, and the transfer can be performed more favorably.

The heating means 50 and the cooling means 70
Is arranged outside the roll 20, so that the roll 2
By simplifying the structure of No. 0, the processing apparatus 1 can be made more inexpensive, more compact, and easier to maintain.

Further, since the processing apparatus 1 is provided with a glossing means 40 in addition to the embossing roll 20, one surface of the sheet 10 'is embossed and the other surface is glossy. The embossed surface can be provided with optical retroreflectivity, and the glazed surface can be provided with gloss. At this time, in particular, since the embossed surface is a cube corner type, this surface can be finished to have excellent long-range visibility and luminance due to light reflection.

Since the cooling means 70 is provided outside the roll 20, the cooling means 70 can also efficiently cool the endless belt 44 of the glazing means 40.

Further, since the shielding plate 60 is provided, it is possible to prevent the heat of the heating means 50 from adversely affecting the other parts. In particular, since the temperature rise of the peeling portion 20B is suppressed, the peeling of the sheet 10 'can be prevented. It can be performed more reliably.

[Second Embodiment] FIG. 8 shows a second embodiment of the present invention.
1 shows a sheet processing apparatus 2 according to an embodiment. FIG.
In the processing device 2, the nip rolls 30 (two in FIG. 8) having a small diameter are installed, and the nip rolls 30 are provided from the glazing means 40, where the thermoplastic resin 10 is formed into a sheet in advance and supplied from the feeding device. It is characterized in that it is made independent and that another cooling roll 41 is incorporated in the glazing means 40 instead of the nip roll 30 in the processing apparatus 1. According to the present embodiment, although the thermoplastic resin 10 is in a sheet shape, the mold transfer can be performed by sufficiently softening the thermoplastic resin 10 in the transfer unit 20A set at a high temperature. The effect can be obtained similarly.

[Third Embodiment] FIG. 9 shows a third embodiment of the present invention.
1 shows a sheet processing apparatus 3 according to an embodiment. FIG.
In the processing apparatus 3, the configuration of the glossing means 40 is greatly different from the sheet processing apparatuses 1 and 2 of the second embodiment. That is, in the glazing means 40 of the present embodiment, the endless belt 44 of the second embodiment is not used, but a glazing film 44 'is used. This film 44 ′ is connected to first to third feed rollers 47.
And is taken up by a take-up device (not shown), but is pressed against the thermoplastic resin 10 between the first and second feed rollers 47 and 48, whereby the thermoplastic resin 10 is glazed. Is being done. In addition,
As the film 44 ', a film having a higher melting point than the thermoplastic resin 10 is used.

[Fourth Embodiment] FIG. 10 shows a fourth embodiment of the present invention.
1 shows a sheet processing apparatus 4 according to an embodiment. FIG.
0, the processing device 4 is the processing device 1 of the first embodiment.
Nip roll 30 constituting the glazing means 40
Auxiliary (backup) between the cooling roll 42
The feature is that the roll 46 is arranged. Therefore, in the present embodiment, the thermoplastic resin 10 of the endless belt 44 is used.
Is pressed by the respective auxiliary rolls 46, so that the thermoplastic resin 10 can be more favorably glazed.

It should be noted that the present invention is not limited to the above-described embodiments, and includes other configurations that can achieve the object of the present invention, in addition to the combinations of the embodiments, and includes the following modifications. Included in the present invention. For example, the first and fourth
In the embodiment, the sheet processing apparatuses 1 and 4 are T-die forming machines 8.
0, and in the second and third embodiments, the processing devices 2 and 3 are configured to include the feeding device that feeds out the sheet-like thermoplastic resin 10, but in the processing device of the present invention, Either the T-die forming machine 80 or the feeder may be used.

The cooling means according to the present invention may be air cooling or mist cooling in addition to the form of the heat exchanger shown in FIG. 7, and the endless belt 44 or the film for glazing may be used as the glazing means 40. When using the belt 44 ', it is preferable to cool the belt 44 and the back surface of the glazing film 44'.

The thermoplastic resin 10 has an embossed pattern on one surface and a gloss on the other surface. For example, a mold for forming an embossed pattern is formed on the endless belt 44. In this case, the embossed pattern may be provided on both sides of the sheet, and conversely, the surface of the stamper roll 21 may be provided with a mirror-like surface to provide gloss on both sides of the sheet.

[0052]

【Example】

[Example 1] In the first embodiment, a cube corner type embossed pattern was formed on the thermoplastic resin 10 by setting the thermoplastic resin 10, the sheet processing apparatus 1, and the processing conditions as follows.

The thermoplastic resin 10 is a soft polyvinyl chloride having a polymerization degree of 1000 to which a plasticizer (DOP: di-2-ethylhexyl phthalate) is added in an amount of 40 parts by weight.

The stamper roll 21 constituting the emboss pattern forming roll 20 has a thickness of 0.3 mm, an outer diameter of 400.0 mm, and a width of 450.0 mm.
The support roll 22 constituting the roll 20 has an outer diameter of 4 mm.
The width is 00.0 mm and the width is 550.0 mm. Insulation member 2
No. 3 is made of silicone rubber and has a rubber hardness of 90 degrees (JIS-
K6301-A), wall thickness (single wall) is 10.0
mm.

The nip roll 30 has an outer diameter of 400.
0mm, width is 550.0mm. The elastic material 31 of the nip roll 30 is made of silicone rubber, has a rubber hardness of 50 degrees (according to JIS-K6301-A), and a thickness (single wall) of 10.0 mm.

Cooling roll 4 constituting glazing means 40
2. The meandering adjustment rolls 44 each have an outer diameter of 40
0.0 mm and the width dimension is 550.0 mm. The endless belt 44 is made of stainless steel and has a thickness of 0.4 m.
m, the width dimension is 500.0 mm, and the surface roughness is 1S.

The heating means 50 is a halogen heater having an output of 4 KW (with four 1 KW heaters attached).

The cooling means 70 has a cooling medium of water, a flow rate of 3 liter / min, and a water temperature of 15 ° C.

The T-die molding machine 80 has a screw diameter of 65.0 mm, an L / D (ratio of screw length to diameter) of 26, a T-die width of 500.0 mm, and an extrusion temperature. (Resin temperature at the die extrusion port) is 185 ° C.

As the temperature condition, the stamper roll 21
The temperature Te of the transfer section 20A above is 180 ° C., and the temperature Th of the peeling section 20B is 50 ° C. Nip roll 3
The temperature of 0 is 20 ° C. The temperature of the cooling roll 42 of the glazing means 40 is 20 ° C. The processing speed is 3 m / min.

Example 2 In Example 1, the same type of thermoplastic resin 10 was formed into a sheet having a thickness of 0.3 mm.
The paper was supplied from the feeding device to the transfer unit 20A. Other conditions are the same as those of the first embodiment.

Example 3 In Example 2, a glazing film 44 ′ was used in place of the endless belt 44. The film 44 'is a polyethylene terephthalate (mylar film) having a thickness of 0.1 mm.

[Comparative Example 1] In Example 1, instead of the heat insulating member 23 of the emboss pattern forming roll 20,
The conditions were the same as in Example 1, except that the same metal members as the stamper roll 21 and the support roll 22 were used.

Comparative Example 2 The same conditions as in Example 1 were used except that the heating means 50 was not used.

Comparative Example 3 The conditions were the same as in Example 1 except that the cooling means 70 was not used.

The above Examples 1 to 3 and Comparative Examples 1 to
3, the embossed sheet 10 'was produced, and the temperatures of the transfer section 20A and the peeling section 20B during production were measured. Also,
The reflection performance of the obtained sheet 10 'was compared.
The evaluation of the reflection performance was performed with respect to luminance. Table 1 shows the measurement results and the evaluation results. The evaluation of the luminance in Table 1 is as follows. A: Sufficient luminance. ×: No retroreflection.

[0067]

[Table 1]

As shown in Table 1, in each of Examples 1 to 3,
The temperature Te of the transfer unit 20A is as high as 180 degrees,
Since the temperature Th of B is as low as 50 ° C. and each is maintained at the initial temperature, it is necessary to obtain good mold reproducibility and peeling between the transfer section 20A and the peeling section 20B. Large temperature differences could be created. Table 1
From the embossed sheet 1 obtained in each of Examples 1 to 3
Since 0 ′ is obtained by the sheet processing apparatus and the processing method according to the present invention, it has sufficient luminance,
It can be seen that the reflection performance is good.

On the other hand, in Comparative Example 1, since the heat insulating member 23 was not present, the heat from the heating means 60 was transmitted to the support roll 22 and diffused.
The temperature Te of A was not maintained, and insufficient filling into the mold 24 occurred, so that good mold transfer could not be performed. Further, in Comparative Example 2, although the heat insulating member 23 was provided, since the heating means 50 was omitted, the stamper roll 21 was provided.
Continues to be cooled by the cooling means 70, and the temperature T of the transfer portion 20A
e has dropped to the same temperature as the temperature Th of the peeling portion 20B. For this reason, insufficient filling of the mold 24 occurred, and good mold transfer could not be performed. Further, according to Comparative Example 3, since the cooling means 70 is not provided, the temperature Th of the peeling portion 20B is lower than the temperature T of the transfer portion 20.
The temperature has risen to the same temperature as e. For this reason, mold deformation occurred at the peeling portion 20B during peeling, and good mold transfer could not be performed. As described above, the embossed sheets 10 'according to Comparative Examples 1 to 3 did not have sufficient luminance and had a problem in reflection performance.

[0070]

As described above, according to the present invention,
At the position where the heating means is arranged, the stamper roll is efficiently heated to a high temperature, and at the position where the cooling means is arranged, the thermoplastic resin after the mold transfer is efficiently cooled to a low temperature. A large temperature difference occurs between the cooled portion of the plastic resin and the cooled portion. Therefore, the mold transfer is performed on a heated stamper roll, and the transferred thermoplastic resin may be cooled and then peeled off, thereby preventing insufficient filling of the resin into the mold and poor peeling to stably produce the sheet. There is an effect that can be. Further, the obtained sheet has good quality and is inexpensive.

[Brief description of the drawings]

FIG. 1 is a front view schematically showing a sheet processing apparatus according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view showing components of the sheet processing apparatus.

FIG. 3 is a front view showing a mold provided with the constituent members.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a plan view of a sheet produced by the sheet processing apparatus.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a perspective view showing another component of the sheet processing apparatus.

FIG. 8 is a front view schematically showing a second embodiment of the present invention.

FIG. 9 is a front view schematically showing a third embodiment of the present invention.

FIG. 10 is a front view schematically showing a fourth embodiment of the present invention.

[Explanation of symbols]

 1-4 Sheet processing apparatus 10 Thermoplastic resin 10 'Embossed sheet 21 Stamper roll 22 Support roll 23 Heat insulating member 24 Mold 40 Glazing means as transfer means 50 Heating means 70 Cooling means

Claims (7)

[Claims] 1. A stamper roll in which a mold for transfer to a thermoplastic resin is formed, a support roll rotatably arranged in the stamper roll, and a stamper roll and a support roll interposed between the stamper roll and the support roll. A heat insulating member, a heating means provided to be able to heat the stamper roll from the outside, and the thermoplastic resin attached to the stamper roll provided so as to be cooled from the outside at a position different from the heating means. A sheet processing apparatus for thermoplastic resin, comprising: a cooling unit. 2. The apparatus for processing a sheet of thermoplastic resin according to claim 1, further comprising another mold for performing transfer on a surface of the thermoplastic resin opposite to a surface to be transferred by the stamper roll. Sheet processing apparatus for thermoplastic resin, characterized by being provided with 3. The thermoplastic resin sheet processing apparatus according to claim 1, wherein the mold has a mirror-like shape. 4. The apparatus for processing a thermoplastic resin sheet according to claim 1, wherein the mold has an embossed surface shape. 5. The thermoplastic resin sheet processing apparatus according to claim 4, wherein the embossed surface is a cube corner type. 6. A stamper roll in which a mold for transfer to a thermoplastic resin is formed is provided with a support roll rotatable in a predetermined rotation direction, and a heat insulating member is provided between the stamper roll and the support roll. Interposed, heating means for heating the stamper roll from the outside, and cooling means for cooling the thermoplastic resin attached to the stamper roll from the outside at a position different from the heating means, The mold of the stamper roll is transferred to the thermoplastic resin by supplying the thermoplastic resin to the front side in the rotation direction with respect to the position where the heating means is provided,
A method for processing a sheet of thermoplastic resin, wherein the transferred thermoplastic resin is separated from the stamper roll after being cooled by the cooling means. 7. A stamper roll on which a mold for transfer to a thermoplastic resin is formed is provided with a support roll rotatable in a predetermined rotation direction, and a heat insulating member is provided between the stamper roll and the support roll. Interposed, heating means for heating the stamper roll from the outside, and cooling means for cooling the thermoplastic resin attached to the stamper roll from the outside at a position different from the heating means, The mold of the stamper roll is transferred to the thermoplastic resin by supplying the thermoplastic resin to the front side in the rotation direction with respect to the position where the heating means is provided,
A thermoplastic resin sheet obtained by cooling the transferred thermoplastic resin by the cooling means and then peeling the thermoplastic resin from the stamper roll.