JP2003136544A - Apparatus and method for heating resin sheet, method for producing resin sheet, and resin sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that, since one surface of a resin sheet is heated while a plane-shaped heater is heat-controlled on the basis of the temperature of the approximately middle part of the width of the sheet, although the distortion of the approximately middle part of the width can be reduced, the distortion of the approximately ends of the width cannot be reduced. SOLUTION: The widthwise direction of the resin sheet S is divided into areas 1-5 of a prescribed range, and upper and lower heater units 41 and 42 are divided into units A1-A5 corresponding to the areas 1-5. By controlling the heating of each area 1-5 by radiation thermometers SA1-SA5 and heaters a1-a25 which are set in each unit A1-A5, distortion occurring non-uniformly in the widthwise direction of the resin sheet S can be reduced effectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin sheet heating device, a resin sheet heating method, a resin sheet manufacturing method and a resin sheet, and more particularly to a resin sheet heating device and a resin sheet for heating to reduce distortion of the resin sheet. Heating method,
The present invention relates to a resin sheet manufacturing method and a resin sheet.

[0002]

2. Description of the Related Art Conventionally, a resin sheet heating device of this type is
A heater having a one-sided heater, a heating controller that performs heating control on the heater, and a temperature measuring device that measures the sheet temperature of a predetermined portion of the resin sheet heated by the heater It has been known. In such a configuration, when the resin sheet carried into the resin sheet heating device is heated, the temperature measuring device measures the sheet temperature at a predetermined portion, and the heating controller inputs the sheet temperature to control the heating heater. Was there.

[0003]

In the above-described conventional resin sheet heating apparatus, the one-sided heater is heated and controlled on the basis of the sheet temperature of a predetermined portion, for example, the substantially central portion of the width to heat the one surface of the resin sheet. Therefore, there is a problem that the strain at the substantially central portion of the width can be reduced, but the strain at the substantially end portion of the width cannot be reduced. On the other hand, when the one-sided heater is heated and controlled based on the sheet temperature at the width end portion, the distortion at the width end portion can be reduced, but the distortion at the substantially central portion cannot be reduced. was there.

The present invention has been made in view of the above problems. By performing heating control for each section in the width direction of the resin sheet, the strain which is unevenly generated in this width direction is appropriately reduced. It is an object of the present invention to provide a resin sheet heating device, a resin sheet heating method, a resin sheet manufacturing method, and a resin sheet that can be used.

[0005]

In order to achieve the above object, the invention according to claim 1 is a resin sheet heating apparatus for heating a carried resin sheet to reduce distortion of the resin sheet. Parameter measuring means capable of measuring a predetermined parameter for each section of the resin sheet divided in a predetermined range, and the section arranged corresponding to the section and measured by the parameter measuring section It is configured to include heating means for heating and controlling the resin sheet of each section based on each parameter.

In the invention according to claim 1 configured as described above, in providing the resin sheet heating device for heating the loaded resin sheet to reduce the distortion of the resin sheet, the loading is carried out by the parameter measuring means. A predetermined parameter is measured for each section of the resin sheet that is sectioned into a predetermined range in the width direction of the resin sheet thus prepared. Then, heating means is arranged corresponding to this section, and each heating means heats and controls the resin sheet of each section based on the parameter for each section measured by the above-mentioned parameter measuring means.

That is, rather than measuring a predetermined parameter of the resin sheet and controlling the heating of the entire resin sheet in the same manner based on the measured parameter, the resin sheet is divided in the width direction and each divided range is divided. The parameter is measured by the parameter measuring means, and heating control based on the parameter for each range is executed by the heating means installed so that each range can be heated individually. This allows
It is possible to perform heating control according to different parameters distributed in the width direction, and it is possible to individually reduce the distortion that occurs nonuniformly in the width direction for each section.

As an example of the parameter of each section measured by the parameter measuring means, the invention according to claim 2 is the resin sheet heating apparatus according to claim 1, wherein the parameter measuring means uses each of the parameters as the parameter. The sheet temperature measuring means for measuring the sheet temperature for each section is provided. In the invention according to claim 2 configured as described above, the parameter measuring means is provided with the seat temperature measuring means. Then, the sheet temperature measuring means measures the sheet temperature for each section. When the sheet temperature of each section is measured in this way, the heating means executes heating control for each section based on the measured sheet temperature.

As an example of the method for measuring the sheet temperature of each section of the resin sheet, the invention according to claim 3 is the resin sheet heating apparatus according to claim 2, wherein the sheet temperature measuring means is provided for each of the sections. Correspondingly, a plurality of sheets are individually arranged and the sheet temperature is measured for each of the above sections. In the invention according to claim 3 configured as described above, a plurality of sheet temperature measuring means are individually arranged corresponding to each section of the resin sheet. Then, the sheet temperature of each corresponding section is measured by each sheet temperature measuring means.

As another example of the method for measuring the sheet temperature of each section of the resin sheet, the invention according to claim 4 is the resin sheet heating apparatus according to claim 2, wherein the sheet temperature measuring means is The sheet temperature is measured for each of the above sections while sequentially moving the sections. In the invention according to claim 4 configured as described above,
The sheet temperature measuring means is made movable, and the movable sheet temperature measuring means is sequentially moved for each section. Then, the sheet temperature measuring means measures the sheet temperature of each section along with this movement.

According to a fifth aspect of the present invention, there is provided an example of a suitable moving path when the sheet temperature measuring means sequentially moves each section.
In the resin sheet heating apparatus according to claim 4, the invention according to claim 4 is characterized in that the sheet temperature measuring means moves from one end to the other end in the width direction when sequentially moving the sections. When it is moved to the other end, it is returned to the one end. In the invention according to claim 5 configured as described above, when the sheet temperature measuring means is sequentially moved, the sheet temperature measuring means is moved from the one end section to the other end section in the width direction. When it moves to the other end section, it returns to the one end section instead of moving to the adjacent section. Then, it again moves from the one end section to the other end section.

As an example of a specific structure suitable for being applied to the sheet temperature measuring means, the invention according to claim 6 is the resin sheet heating apparatus according to any one of claims 2 to 5, The temperature measuring means has a structure of a radiation temperature measuring device. In the invention according to claim 6 configured as described above, a radiation temperature measuring device is adopted as the seat temperature measuring means.

As still another example of the method of measuring the sheet temperature of each section of the resin sheet, the invention according to claim 7 is the resin sheet heating apparatus according to claim 2, wherein the sheet temperature measuring means is In addition to being configured by a line sensor, the line sensor measures the sheet temperature for each section. In the invention according to claim 7 configured as described above, the sheet temperature measuring means is configured by a line sensor. And
The line sensor is installed in the width direction and the sheet temperature of each section is measured.

As another example of the parameter of each section measured by the parameter measuring means, the invention according to claim 8 is the resin sheet heating apparatus according to claim 1, wherein the parameter measuring means uses the parameter as the parameter. It is configured to have a sheet thickness measuring means for measuring the resin sheet thickness for each of the above sections. In the invention according to claim 8 configured as described above, the parameter measuring means is provided with the sheet thickness measuring means. Then, the sheet thickness measuring means measures the resin sheet thickness for each section. When the resin sheet thickness of each section is measured in this way, the heating means executes heating control for each section based on the measured resin sheet thickness.

As still another example of the parameter of each section measured by the parameter measuring means, the invention according to claim 9 is the resin sheet heating apparatus according to claim 1, wherein the parameter measuring means is the parameter. The sheet strain measuring means for measuring the sheet strain for each of the above sections is provided. In the invention according to claim 9 configured as described above, the parameter measuring means is provided with the sheet strain measuring means. Then, the sheet strain of each section is measured by the sheet strain measuring means. When the sheet strain of each section is measured in this way, the heating means executes heating control for each section based on the measured sheet strain.

In the above-described invention, the width direction of the resin sheet is divided, and the heating control is executed for each section based on the parameter measured for each section. The mode in which the resin sheet is divided in the predetermined direction and the heating control is executed for each of the divisions is not limited to the width direction of the resin sheet, but may be the conveyance direction. Therefore, the invention according to claim 10 is the resin sheet heating apparatus according to any one of claims 2 to 9, wherein the sheet temperature measuring means is arranged so that each of the resin sheets is divided in a conveying direction into a predetermined range. While it is possible to measure the sheet temperature for each section, the heating means is arranged corresponding to each section in the conveyance direction, and the sheet temperature for each section measured by the sheet temperature measuring means is set to the sheet temperature. Based on this, the resin sheet of each section is heated and controlled.

In the invention according to claim 10 configured as described above, it is possible to measure the sheet temperature of each section obtained by dividing the sheet temperature measuring means in a predetermined range with respect to the conveying direction of the resin sheet. Further, in accordance with this, heating means is arranged corresponding to each section in the carrying direction. And
The heating means controls the heating of the resin sheet of each section based on the sheet temperature measured by the sheet temperature measuring section for each section in the transport direction.

As an example of heating control for each section in the transport direction, the invention according to claim 11 is the resin sheet heating apparatus according to claim 10, wherein the heating means is
The heating control is performed so that the sheet temperature is gradually cooled in the conveying direction. In the invention according to claim 11 configured as described above, heating control is executed so that the sheet temperature is gradually cooled by the heating means in the conveying direction.

When the resin sheet carried into the resin sheet heating device is conveyed, it is common to use a conveying roll. At this time, since the resin sheet comes into contact with the carrying roll, the heat of the resin sheet is absorbed by the carrying roll and the resin sheet is cooled, and the effectiveness of heating control by the heating means is weakened. Therefore, the invention according to claim 12 is, in the resin sheet heating apparatus according to claim 11, provided with a plurality of transport rolls for transporting while carrying the loaded resin sheet in a transport direction, and each transport roll is The temperature is adjusted according to the heating control by the heating means. 13. The structure according to claim 12, which is configured as described above.
In the invention according to the above aspect, when a plurality of transport rolls for transporting the loaded resin sheet are placed in the transport direction, the temperature of each transport roll is adjusted according to the heating control by the heating means.

When heating the resin sheet, a three-stage roll may be used for the purpose of leveling the surface of the resin sheet. At this time, even in this three-stage roll, it is more effective to perform heating control for each section in the width direction of the resin sheet. Therefore, the invention according to claim 13 is the resin sheet heating apparatus according to any one of claims 2 to 12, wherein the resin sheet heating device includes a three-stage roll for winding and carrying back the resin sheet to be carried in. The sheet temperature measuring means is configured to measure the sheet temperature of the resin sheet wound around at least one roll. According to the thirteenth aspect of the invention configured as described above, a three-stage roll is provided that, when heating the resin sheet, folds the resin sheet that is carried in and folds it back and conveys it. Then, the sheet temperature measuring means measures the sheet temperature of each section in the width direction of the resin sheet wound around at least one of the three rolls.
Then, the heating means executes heating control for each section based on the sheet temperature.

As an example of the method of conveying the resin sheet,
The invention according to claim 14 is the above-mentioned claim 1 to claim 13.
The resin sheet heating apparatus according to any one of the above 1 through 3 is configured to include a conveying unit that clamps and holds a substantially peripheral edge of the carried-in resin sheet and conveys the resin sheet. In the invention according to claim 14 configured as described above, the transport means clamps and holds the substantially peripheral edge of the loaded resin sheet when the loaded resin sheet is transported.

As an example of a method capable of preventing drawdown of a resin sheet that may occur during heating, the invention according to claim 15 provides the resin sheet heating apparatus according to any one of claims 1 to 14, The sheet width expanding means for expanding the sheet width of the carried-in resin sheet is provided. According to the fifteenth aspect of the invention configured as described above, a sheet width expanding means for expanding the sheet width of the carried-in resin sheet is provided, and the resin sheet is expanded while the sheet width is expanded by the sheet width expanding means. Transport.

The invention according to claim 16 provides a material for a resin sheet, which is effective by executing the above-mentioned heating control.
In the resin sheet heating device according to any one of claims 1 to 15, the resin sheet is made of an optical material. In the invention according to claim 16 configured as described above, the resin sheet is formed of an optical material.

Here, the above-mentioned method of heating the carried-in resin sheet to reduce the distortion of the resin sheet is not necessarily limited to an actual apparatus, and it is easy to function as that method. It can be understood. For this reason,
The invention according to claim 17 is a resin sheet heating method for heating a carried-in resin sheet to reduce the distortion of the resin sheet, wherein the width direction is predetermined for each section of the resin sheet. Parameter measurement step for measuring the parameters of, and is arranged corresponding to the above classification,
And a heating step of heating and controlling the resin sheet of each section based on the parameter of each section measured in the parameter measuring step. That is, there is no difference in that the method is not limited to the actual device and is effective as the method.

The invention is also realized as a method of manufacturing a resin sheet by dividing the resin sheet in the width direction and measuring parameters for each division and controlling heating. Therefore, an invention according to claim 18 is a resin sheet manufacturing method for manufacturing a resin sheet in which distortion of the resin sheet is reduced by heating the carried resin sheet, wherein the width direction is divided into a predetermined range. By measuring the predetermined parameter for each section of the resin sheet, and by heating control the resin sheet of each section based on the parameter for each section that is arranged and measured corresponding to the section It is configured to generate a resin sheet.

Further, it goes without saying that the invention can be applied to the resin sheet produced by such a method. Therefore, in the invention according to claim 19, the width direction is divided into a predetermined range, a predetermined parameter is measured for each section, and each section is subjected to heating control based on the measured parameter for each section. The resin sheet produced by the above is a constitution of the invention.

[0027]

As described above, according to the present invention, by performing the heating control for each section in the width direction of the resin sheet, it is possible to appropriately reduce the strain which is unevenly generated in the width direction. It is possible to provide a simple resin sheet heating device. Further, according to the invention of claim 2, an example of parameters required for heating control of the resin sheet can be presented. Further, according to the invention of claim 3,
An example of a method for measuring the seat temperature with a simple configuration can be presented. Furthermore, according to the invention of claim 4, another example of the method for measuring the seat temperature can be presented. Further, according to the invention of claim 5,
The measurement intervals of the sheet temperature in each section can be made uniform.

Further, according to the invention of claim 6,
A suitable example can be presented by applying it to the seat temperature measuring means. Further, according to the invention of claim 7,
An example of a method of measuring the seat temperature with a simpler configuration can be presented. Further, according to the invention of claim 8, another example of the parameters required for heating control of the resin sheet can be presented. Further, claim 9
According to the present invention, still another example of the parameters required for heating control of the resin sheet can be presented. Further, according to the invention of claim 10, it becomes possible to execute the heating control for each section also in the transport direction.

Further, according to the invention of claim 11, since the resin sheet is cooled stepwise, the molecular density of the resin sheet can be made dense. further,
According to the twelfth aspect of the invention, it becomes possible to enhance the effectiveness of the heating control by the heating means. Further, according to the thirteenth aspect of the present invention, it becomes possible to perform the heating control for each section in the width direction even when the three-stage roll is used for carrying in the resin sheet. Furthermore, according to the fourteenth aspect of the present invention, the sheet can be spread flat when heated. Further, according to the invention of claim 15, it becomes possible to prevent drawdown of the resin sheet, and at the same time, the resin sheet is stretched to improve the strength.

Further, according to the sixteenth aspect of the present invention, it is possible to perform the heating control according to the present invention and present an example of an effective material for the resin sheet. Further, according to the seventeenth aspect of the present invention, by performing the heating control for each section in the width direction of the resin sheet, it is possible to appropriately reduce the distortion that is unevenly generated in the width direction. A sheet heating method can be provided. further,
According to the eighteenth aspect of the present invention, there is provided a method for manufacturing a resin sheet, in which heating control is performed for each section in the width direction of the resin sheet to appropriately reduce the strain that is unevenly generated in the width direction. Can be provided. Further, according to the invention of claim 19, by performing the heating control for each section in the width direction, it is possible to provide a resin sheet in which the strain generated non-uniformly in the width direction is appropriately reduced. it can.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described here in the following order. (1) Outline of the invention: (2) Configuration of roll sheet manufacturing system: (3) Configuration of upper and lower heater units: (4) Heating control processing: (5) Variation of sheet temperature measuring method: ( 6) Modified example of roll sheet manufacturing system: (7) Configuration of side heater roll unit: (8) Configuration of upper and lower heater units: (9) Summary:

(1) Outline of the Invention: FIGS. 1 and 2 are schematic diagrams showing the outline of the invention of a resin sheet heating apparatus according to the present invention. In the figure, a resin sheet heating device C includes a parameter measuring means C1 and a heating means C2,
By heating the resin sheet C3 to be heated by the heating means C2, the distortion of the resin sheet C3 is removed. Here, in the present invention, the resin sheet C3 in the heating range is divided into areas a to e in a predetermined range in the width direction. The parameter measuring means C1 measures a predetermined parameter from the areas a to e, and the measured parameter is input to the heating means C2. Then, the heating unit C2 executes different heating control for each of the areas a to e according to this parameter.

As a result, conventionally, the areas a to e are heated and controlled at the uniform temperature T1 based on the predetermined parameters, but the areas a and e are changed according to the parameters of the areas a to e. It becomes possible to control heating at the temperature T2, control heating of the areas b and d at the temperature T3, and control heating of the area c at the temperature T3. The resin sheet carried into the resin sheet heating device C is not originally uniformly distorted in the width direction. That is, distortion occurs nonuniformly in the width direction. Even if the heating is controlled at a uniform temperature T1 in the width direction based on a predetermined parameter as in the conventional case, the strain cannot be removed. In the present invention, the parameters are measured for each of the areas a to e divided in the width direction, and the heating control is executed for each of the areas a to e, thereby finally reducing the strain generated non-uniformly in the width direction. It is possible to form the resin sheet C3.

(2) Constitution of roll sheet manufacturing system: FIG. 3 shows a resin sheet heating apparatus C according to the present invention.
It is a block diagram which showed schematic structure of the roll sheet manufacturing system which has. In the figure, the roll sheet manufacturing system 10 is equipped with an extrusion device 20, which extrudes a resin sheet after melting a raw material resin. The extrusion device 20 has a heating cylinder 22 in which a charging port 21 through which a raw material resin can be charged is formed in the upper left part.
The heating cylinder 22 has a screw 23 having a spiral guide groove rotatably accommodated therein. In addition, a circular die 24a is provided at the right end opening of the heating cylinder 22.
Is attached to the sheet die 24. Then, the cutting edge 25a is provided on the outlet side of the circular die 24a.
A cutter 25 is disposed so as to cover the upper end of the.

With this structure, when the raw material resin is fed from the feeding port 21 while rotating the screw 23 around the axis, the fed raw material resin is gradually melted and fed to the sheet die 24 along the guide groove, Circular die 24
A resin sheet having a hollow cylindrical shape is extruded from a. Then, the hollow cylindrical resin sheet S is cut at the upper portion by the cutter 25 to be formed into a sheet shape, and is conveyed toward the heating device 40 by the pinch roll 30. The heating device 40 includes an upper heater unit 41 and a lower heater unit 42, and the resin sheet S carried in by the upper and lower heater units 41, 42 is heated to remove the distortion generated in the resin sheet. The resin sheet S from which the distortion has been removed is the sheet winding device 50.
It is rolled up into a roll sheet.

In the present embodiment, when removing the distortion of the resin sheet S by heating the resin sheet S by the heating device 40, the upper heater unit corresponding to the resin sheet S divided in a predetermined range in the width direction. The heaters provided in the lower heater unit 42 and the lower heater unit 42 are classified.
Then, by performing heating control for each of the sections, the distortion of the resin sheet S that is unevenly distributed in the width direction is individually removed, and the resin sheet S from which the distortion is uniformly removed is removed.
To form.

(3) Constitution of heater unit: FIG. 4 shows an upper heater unit 41 and a lower heater unit 4.
It is a block diagram which showed the structure of 2. In the figure, the left side of the figure is the inlet side of the resin sheet S, and the right side of the figure is the outlet side. The upper and lower heater units 41, 42 have heaters a1 to a25 arranged vertically and horizontally 5 × 5, and radiation thermometers SA1 to SA5 are arranged on the outlet side. In the present embodiment, the heaters a1 to a5 and the radiation thermometer SA1 constitute the unit A1, and the heater a
6 to a10 and the radiation thermometer SA2 configure the unit A2, the heaters a11 to a15 and the radiation thermometer SA3 configure the unit A3, the heaters a16 to a20 and the radiation thermometer SA4 configure the unit A4, and the heater a21.
-A25 and radiation thermometer SA5 comprise unit A5. The units A1 to A5 correspond to the widthwise sections (areas 1 to 5) of the resin sheet S.

In this embodiment, infrared heaters are used as the heaters a1 to a25 arranged in the upper and lower heater units 41 and 42. The wavelength of the infrared heater is not particularly limited, and a suitable one can be appropriately selected depending on the material of the resin sheet S, the absorption wavelength, the thickness, and other conditions. Therefore, it may be a mid-far infrared heater or a near infrared heater. At this time, the radiation area and the distance between the heaters a1 to a25 and the resin sheet S may be appropriately set according to the conditions.

FIG. 5 is a block diagram showing a simplified structure of a heating control system for heating and controlling the heater units 41, 42. In the figure, the heating control system 60 has a heating control controller 61, and this heating control controller 61 has a CPU, RAM, ROM, and
An external input interface and an external output interface are provided, and the CPU can execute the heating control process based on a predetermined heating control program stored in the ROM while using the RAM as a work area. Further, the radiation thermometers SA1 to SA5 of the units A1 to A5 are connected to an external input interface, and the heating controller 61 can measure the sheet temperature of each section. Further, the heaters a1 to a25 of the units A1 to A5 are individually connected to the heating control controller 61 via an external output interface.

In such a configuration, the CPU of the heating controller 61 executes the heating control processing of the heaters a1 to a5 corresponding to the sheet temperature measured by the radiation thermometer SA1 and the sheet measured by the radiation thermometer SA2. The heating control processing of the heaters a6 to a10 is executed corresponding to the temperature, the heating control processing of the heaters a11 to a15 is executed corresponding to the sheet temperature measured by the radiation thermometer SA3, and the radiation thermometer S
Heater a16-corresponding to the seat temperature measured in A4
The heating control processing of a20 is executed, and the heating control processing of the heaters a21 to a25 is executed corresponding to the sheet temperature measured by the radiation thermometer SA5. Here, in the present embodiment, the sheet temperatures measured by the radiation thermometers SA1 to SA5 are set to the sheet temperatures t1 to t5.

FIG. 6 is a state diagram showing an example of a state in which the heating control controller 61 executes different heating controls for each section. In the figure, the vertical axis shows the heating temperature in the heating control, and the horizontal axis shows the range of the units A1 to A5 corresponding to the division of the resin sheet S. In the present embodiment, the heaters a1 to a5 of the unit A1 are heated and controlled by the heating temperature TA1, and the heaters a6 to a10 of the unit A2 are heated to the heating temperature TA.
2 controls heating. Further, the heaters a11 to a15 of the unit A3 are heated and controlled by the heating temperature TA3, the heaters a16 to a20 of the unit A4 are heated and controlled by the heating temperature TA4, and the heaters a21 to a25 of the unit A5 are heated by the heating temperature TA5. Control. In this way, the resin sheet S is controlled by heating both widthwise end portions at a heating temperature higher than the central portion.
It is possible to remove the distortion that is strongly generated at the peripheral edge of the.

(4) Heating Control Process: FIG. 7 is a flowchart showing the contents of the heating control process executed by the heating controller 61. In the figure, when the operation of the roll sheet manufacturing system 10 is started, the heating control controller 61 determines each of the heaters a1 to a2 based on the set predetermined heating temperatures TA1 to TA5.
The heating of No. 5 is started (step S100). Next, each sheet temperature t1 to t5 of each section is measured based on the input from the radiation thermometers SA1 to SA5 (step S105,
S110). Then, each measured sheet temperature t1
Corresponding heating temperatures TA1 to TA for which ~ t5 is set
If it is determined that the sheet temperature t1 to t5 is lower than the heating temperatures TA1 to TA5, the units A1 to A5 corresponding to the areas 1 to 5 determined to be low are determined. Heater a1 to heater a25
Are heated up (step S120).

On the other hand, when it is determined in step S115 that the sheet temperatures t1 to t5 are equal to or higher than the corresponding heating temperatures TA1 to TA5, the measured sheet temperatures t1 to t5 are the set heating temperatures TA1 to TA5. It is determined whether or not it is higher (step S125), and if it is determined to be higher, the heaters a1 to a25 of the units A1 to A5 corresponding to the areas 1 to 5 determined to be higher are lowered and heated (step S130). ). Further, in step S125, the heating temperatures TA1 to T corresponding to the respective sheet temperatures t1 to t5 are set.
When it is determined that the values are equal to A5, the heaters a of the units A1 to A5 corresponding to the areas 1 to 5 that are determined to be equal
The temperatures of 1 to the heater a25 are maintained. In this way, the seat temperature t measured in steps S105 to S130
Feedback control is performed based on the heating temperatures TA1 to TA5 set to 1 to t5. Such feedback control is executed until the operation of the roll sheet manufacturing system 10 ends (step S135), and when the operation ends, the heating control of the heaters a1 to a25 ends (step S140).

(5) Modification of seat temperature measuring method: In the above-described embodiment, each unit A1 to A is used.
5, radiation thermometers SA1 to SA5 are arranged, and the sheet temperatures t1 to t5 of the areas 1 to 5 are individually measured. Of course, the sheet temperatures t1 to t5 of the respective areas 1 to 5
The method of measuring is not limited to the configuration in which the individual radiation thermometers SA1 to SA5 are used. By moving one radiation thermometer to each area 1 to 5, the sheets of each area 1 to 5 can be measured. The temperatures t1 to t5 may be measured.

FIG. 8 shows one radiation thermometer for each area 1
It is a block diagram which showed an example of the structure which can measure the sheet | seat temperature of -5. In the figure, the main body outer frame 4 of the heating device 40
The ball screw 44 is arranged in the width direction of 3, and the servo motor 45 is connected to one end of the ball screw 44. The servo motor 45 is electrically connected to the heating controller 61 via a servo amplifier (not shown),
The rotation is controlled by the control of the heating controller 61. Then, at a predetermined position of the ball screw 44, the radiation thermometer S
Install A6. In such a configuration, the heating controller 61 controls the movement of the radiation thermometer SA6 by rotating the ball screw 44 when measuring the sheet temperatures t1 to t5 of the areas 1 to 5.

FIG. 9 is a flow chart showing the processing contents of the movement control processing of the radiation thermometer SA6 executed by the heating controller 61. In the figure, when the operation of the roll sheet manufacturing system 10 is started, first, the radiation thermometer SA6 is controlled to move above the area 1 (step S200). Then, the radiation thermometer SA6 measures the sheet temperature t1 and executes heating control (step S205). Next, the radiation thermometer SA6 is controlled to move above the area 2 (step S210). Then, the radiation thermometer SA6 measures the sheet temperature t2 and executes heating control (step S21).
5). Next, the radiation thermometer SA6 is controlled to move above the area 3 (step S220). Then, the radiation thermometer SA6 measures the sheet temperature t3 and executes heating control (step S225).

Next, a radiation thermometer SA6 is provided above the area 4.
Is controlled to move (step S230). Then, the radiation thermometer SA6 measures the sheet temperature t4 and executes heating control (step S235). next,
The radiation thermometer SA6 is controlled to move above the area 5 (step S240). Then, the radiation thermometer SA6 measures the sheet temperature t5 and executes heating control (step S245). Next, it is determined whether or not the operation is completed (step S250), and if the operation is not completed, the radiation thermometer SA6, for which the measurement of the sheet temperature t5 of the area 5 is completed, is displayed in the adjacent area 4. Instead of controlling the movement, the movement is controlled from the area 5 to the area 1. As a result, it is possible to equalize the time during which the radiation thermometer SA6 moves between the areas, and it is possible to execute more accurate heating control.

In the embodiments described above, the radiation thermometers SA1 to SA6 are adopted as the devices for measuring the sheet temperatures t1 to t5 of the areas 1 to 5. However, in the radiation thermometers SA1 to SA6, the measurement surface is usually formed in a substantially circular shape, and the size thereof is formed in φ30 to φ40. Therefore, as shown in FIG.
From 1 to t5, temperatures in the range of approximately φ30 to φ40 are measured. In this way, the radiation thermometers SA1 to SA
In 6, the sheet temperature in a partial range is measured in the width direction. Here, the sheet temperature t of each area 1 to 5
When measuring 1 to t5, as a configuration capable of grasping the sheet temperatures t1 to t5 in the entire width direction in each area 1 to 5, as shown in FIG. 11, a line sensor is arranged in the heating device 40. Just do it. At this time, the line sensor 46 is arranged in the width direction of the outer frame 43 of the heating device 40. As a result, the measurement surface faces the entire width direction of the resin sheet S, so that the sheet temperatures t1 to t5 of the areas 1 to 5 can be accurately measured.

(6) Modified Example of Roll Sheet Manufacturing System: In the above-described embodiments, the configuration in which the resin sheet S extruded from the circular die 23a and formed into a sheet by the cutter 25 is heated is described. . The method of forming such a sheet-shaped resin sheet S is not limited to extrusion from the circular die 23a, and a sheet die may be used. Next, a schematic configuration of a roll manufacturing system using a sheet die is shown in the configuration diagram of FIG. In the figure, a roll sheet manufacturing system 100
Is equipped with an extrusion device 200. The extrusion device 200 extrudes a resin sheet after melting a raw material resin. In this extrusion device 200, a heating cylinder 2 having a charging port 201 for charging a raw material resin formed on the upper left side thereof.
02 is provided, and a screw 203 having a spiral guide groove is rotatably housed inside the heating cylinder 202. Further, at the right end opening of the heating cylinder 202, approximately T
A sheet die 204 formed in a V shape is attached.

With this structure, when the raw material resin is fed from the feeding port 201 while rotating the screw 203 around the axis, the fed raw material resin is gradually melted and fed to the sheet die 204 along the guide groove, The sheet die 204 is stretched in a thin sheet shape in a substantially horizontal direction.
Is extruded as a resin sheet from the extrusion port 204a.
A chill roll unit 300 is provided on the right side of the extrusion device 200.
The resin sheet S extruded from the extrusion device 200 is formed to have a constant thickness in the chill roll unit 300, and the pinch roll 301 heats the heating device 40.
It is transported toward 0. The heating device 400 is the upper heater 40.
1 and a lower heater 402, and the upper and lower heaters 4
The resin sheet S carried in by 01 and 402 is heated and cooled.

As shown in FIG. 13, the chill roll unit 300 has rotatably mounted first to third rolls 302 to 304 arranged in a substantially vertical direction in order from above. Then, the resin sheet S extruded from the extrusion port 204a is sandwiched in the gap between the first roll 302 and the second roll 303 and then drawn out, and then the second roll 3
03 and the third roll 304 are pulled out while being sandwiched between the third roll 304 and the third roll 304, so that the third roll 304 is advanced from below the third roll 304. At this time, the resin sheet S is sandwiched between the rolls 302 to 304 and pulled out to be gradually formed to have a constant thickness, and the resin sheet S formed to have this constant thickness is heated by the pinch roll 301 by a heating device. It is transported to 400.

As described above, the chill roll unit 300
The yield of the resin sheet S drawn out by the rolls 302 to 304 is particularly caused when an optical system material is applied to the resin sheet S, due to the uneven strain in the width direction. Therefore, in the present embodiment, the side surface heater units 305 and 306 are arranged so as to face the side surfaces of the second roll 302 and the third roll 304. Then, the side heater units 305 and 306 are provided with heaters capable of individually controlling heating in areas in which the resin sheet S is divided in the width direction, and the same heating control as described above can be executed.

(7) Constitution of Side Heater Roll Unit: FIG. 14 shows side heater units 305 and 306.
It is a block diagram showing the configuration of. In the figure, the upper side of the figure is the loading side of the resin sheet S, and the lower side of the figure is the unloading side. In the side heater units 305 and 306, heaters b1 to b15 are arranged vertically and horizontally 3 × 5, and radiation thermometers SB1 to SB5 are arranged on the carry-out side. In this embodiment, the heaters b1 to b3 and the radiation thermometer SB1 constitute the unit B1, and the heater a
4 to a6 and the radiation thermometer SB2 configure the unit B2, the heaters b7 to b9 and the radiation thermometer SB3 configure the unit B3, the heaters b10 to b12 and the radiation thermometer SB4 configure the unit B4, and the heaters b13 to b1
5 and the radiation thermometer SB5 form a unit B5. The units B1 to B5 correspond to the sections (areas 1 to 5) in the width direction of the resin sheet S.

FIG. 15 shows heater units 305 and 306.
It is a block diagram which showed the simplified structure of the heating control system which heat-controls. In the figure, the heating control system 600 has a heating control controller 601, and this heating control controller 601 executes the same configuration and heating control as the heating control controller 61 described above. here,
The state when the heating control is executed by the heating controller 601 is shown in the state diagram of FIG. In the figure,
The vertical axis shows the heating temperature in the heating control, and the horizontal axis shows the range of the units B1 to B5 corresponding to the section of the resin sheet S. In this embodiment, the unit B
The heaters b1 to b3 included in No. 1 are heated and controlled by the heating temperature TB1, and the heaters b4 to b6 included in the unit B2 are heated and controlled by the heating temperature TB2. Further, the heaters b7 to b9 included in the unit B3 are heated and controlled by the heating temperature TB3, and the heaters b10 to b included in the unit B4 are controlled.
12 is controlled by the heating temperature TB4, and the unit B
The heaters b13 to b15 included in No. 5 are heated and controlled by the heating temperature TB5. In this way, by heating the both widthwise end portions at a heating temperature higher than the central portion, it is possible to remove the strain that is strongly generated at the peripheral portion of the resin sheet S.

As described above, when the chill roll unit 300 is disposed in the post process of the extrusion device 200 and the side heater units 305 and 306 are disposed in the chill roll unit 300, the side heater units 305 and 306 are used. The distortion of the resin sheet S can be reduced. At this time, in the heating device 400, which is a post-process of the chill roll unit 300, heating control is not individually executed for each of the areas 1 to 5 divided in the width direction, but the resin sheet S is used.
It is preferable that the resin sheet S is heated and cooled by dividing the conveying direction into areas of a predetermined range and gradually reducing the heating temperature, so that the quality of the resin sheet S can be improved.

(8) Constitution of Upper and Lower Heater Units: FIG. 17 is a constitutional view showing the constitutions of the upper heater unit 401 and the lower heater unit 402 capable of heating and cooling. In the figure, the left side of the figure is the inlet side of the resin sheet S, and the right side of the figure is the outlet side. The upper and lower heater units 401 and 402 are heaters c1 to c1.
c20 is arranged vertically and horizontally 4 × 5, and heaters c2 and c3, heaters c6 and c7, heaters c10 and c1
Radiation thermometers SC1 to SC5 are arranged side by side between the heaters c14 and c15 and the heaters c18 and 19.
In the present embodiment, the heaters c1 to a4 and the radiation thermometer SC1 constitute the unit C1, and the heaters c5 to c8.
The radiation thermometer SC2 constitutes the unit C2, and the heaters c9 to c12 and the radiation thermometer SC3 form the unit C3.
, Heaters c13 to c16 and radiation thermometer SC
4 constitutes the unit C4, and the heaters c17 to c20 and the radiation thermometer SC5 constitute the unit C5. The units C1 to C5 correspond to the sections of the resin sheet S in the conveyance direction.

FIG. 18 shows the upper and lower heater units 401, 4
It is a block diagram which showed the simplified structure of the heating control system which heat-controls 02. In the figure, a heating control system 61
0 has a heating control controller 611, and this heating control controller 611 has a CPU (not shown),
A RAM, a ROM, an external input interface, and an external output interface are provided, and the CPU can perform heating control processing based on a predetermined heating control program stored in the ROM while using the RAM as a work area. Further, the radiation thermometer S of the units C1 to C5
C1 to SC5 are connected to an external input interface, and the heating controller 611 can measure the sheet temperature of each section. In addition, each unit C
The heaters c1 to c20 of 1 to C5 are individually connected to the heating control controller 611 via an external output interface.

In such a configuration, the CPU of the heating control controller 611 executes the heating control processing of the heaters c1 to c4 corresponding to the sheet temperature measured by the radiation thermometer SC1, and the sheet measured by the radiation thermometer SC2. The heating control processing of the heaters c5 to c8 is executed corresponding to the temperature, and the heating control processing of the heaters c9 to c12 is executed corresponding to the sheet temperature measured by the radiation thermometer SC3.
Heaters c13 to c corresponding to the seat temperature measured at 4
The heating control process of 16 is executed, and the heating control process of the heaters c17 to c20 is executed corresponding to the sheet temperature measured by the radiation thermometer SC5.

FIG. 19 is a state diagram showing an example of a state in which the heating control controller 611 executes different heating controls for each section. In the figure, the vertical axis represents the heating temperature in the heating control, and the horizontal axis represents the ranges of the units C1 to C5 corresponding to the sections in the transport direction of the resin sheet S. In this embodiment, the unit C1
The heaters c1 to c4 included in the unit are controlled to be heated by the heating temperature TC1, and the heaters c5 to c8 included in the unit C2 are controlled to be heated by the heating temperature TC2. Also, unit C
The heaters c9 to c12 included in unit 3 are controlled to be heated by the heating temperature TC3, and the heaters c13 to c included in the unit C4 are included.
16 is controlled by the heating temperature TC4, and the unit C
The heaters c17 to c20 included in No. 5 are heated and controlled by the heating temperature TC5. As described above, by gradually reducing the heating temperature in the conveying direction, the resin sheet S can be conveyed while being heated and cooled.

In the present embodiment, the heating device 40
Although the method of transporting the resin sheet S in No. 1 was not described in detail,
For example, the upper and lower heater units 40, 4 of the heating device 40 are adopted by adopting a carrying method in which the peripheral edge of the resin sheet S is clamped by a grip chain and carried.
In the interval 1, the resin sheet S can be spread evenly, and the effectiveness of heating control can be improved.
Further, a conveyance method may be adopted in which the resin sheet S is conveyed while being gradually expanded in the heating device 40. When such a conveying method is adopted, the resin sheet S can be stretched and the sheet strength can be improved.

(9) Summary: In this way, the resin sheet S
The width direction of each of the upper and lower heater units 41 and 42 is divided into areas 1 to 5 within a predetermined range.
The radiation thermometers SA1 to SA5 are divided into units A1 to A5 according to
By performing the heating control for each area 1 to 5 by the heaters a1 to a25, it is possible to effectively reduce the distortion that is unevenly generated in the width direction of the resin sheet S.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an outline of the invention of a resin sheet heating apparatus according to the present invention.

FIG. 2 is a schematic diagram showing an outline of the invention of a resin sheet heating apparatus according to the present invention.

FIG. 3 is a configuration diagram showing a schematic configuration of a roll sheet manufacturing system having a resin sheet heating device.

FIG. 4 is a configuration diagram showing configurations of an upper heater unit and a lower heater unit.

FIG. 5 is a configuration diagram showing a simplified configuration of a heating control system.

FIG. 6 is a state diagram in the case where different heating controls are executed for each classification.

FIG. 7 is a flow chart showing the processing contents of heating control processing.

FIG. 8 is a configuration diagram showing an example of a configuration capable of measuring the sheet temperature in each area.

FIG. 9 is a flowchart showing the processing contents of movement control processing.

FIG. 10 is a diagram showing an outline of a measurement range of a radiation thermometer.

FIG. 11 is a configuration diagram when a line sensor is used.

FIG. 12 is a configuration diagram showing another schematic configuration of a roll sheet manufacturing system having a resin sheet heating device.

FIG. 13 is a configuration diagram showing a configuration of a chill roll unit.

FIG. 14 is a configuration diagram showing a configuration of a side heater unit.

FIG. 15 is a configuration diagram showing a simplified configuration of a heating control system.

FIG. 16 is a state diagram in the case where different heating control is executed for each classification.

FIG. 17 is a configuration diagram showing another configuration of an upper heater unit and a lower heater unit.

FIG. 18 is a configuration diagram showing a simplified configuration of a heating control system.

FIG. 19 is a state diagram showing an example of a state where different heating controls are executed for each classification.

[Explanation of symbols]

C ... Resin sheet heating device C1 ... Parameter measuring means C2 ... Heating means C3 ... Resin sheet 40 ... Heating device 41 ... Upper heater unit 42 ... Lower heater unit a1-a25 ... heater A1-A5 ... Unit SA1 to SA5 ... Radiation thermometer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenichi Mizoguchi             158 Kitayama, Morowa, Togo-cho, Aichi-gun, Aichi             Local 247 Asano Laboratory Co., Ltd. (72) Hideki Usami             158 Kitayama, Morowa, Togo-cho, Aichi-gun, Aichi             Local 247 Asano Laboratory Co., Ltd. F-term (reference) 4F203 AC03 AG01 AH73 AM32 AM35                       AP05 AP11 AP20 AR06 DA12                       DB02 DC01 DD01 DE06 DE09                       DJ01 DJ11 DK07 DK08 DK10                       DK11 DK13 DL01 DN06

Claims (19)

[Claims] 1. A resin sheet heating device for heating a carried-in resin sheet to reduce distortion of the resin sheet, wherein a predetermined parameter is set for each section of the resin sheet divided in a width direction into a predetermined range. A measurable parameter measuring means and a heating means which is arranged corresponding to the above section and which controls heating of the resin sheet of each section based on the parameter for each section measured by the parameter measuring section. A resin sheet heating device comprising: 2. The resin sheet heating device according to claim 1, wherein the parameter measuring means has a sheet temperature measuring means for measuring the sheet temperature of each of the sections as the parameter. 3. The resin sheet heating according to claim 2, wherein a plurality of the sheet temperature measuring means are individually arranged corresponding to the sections, and the sheet temperature is measured for each of the sections. apparatus. 4. The resin sheet heating device according to claim 2, wherein the sheet temperature measuring means measures the sheet temperature for each of the sections while sequentially moving the sections. 5. The sheet temperature measuring means moves from one end to the other end in the width direction when sequentially moving the sections and returns to the one end when moving to the other end. The resin sheet heating device according to claim 4, which is characterized in that. 6. The resin sheet heating apparatus according to claim 2, wherein the sheet temperature measuring means is a radiation temperature measuring device. 7. The resin sheet heating according to claim 2, wherein the sheet temperature measuring means is composed of a line sensor, and the sheet temperature of each of the sections is measured by the line sensor. apparatus. 8. The resin sheet heating apparatus according to claim 1, wherein the parameter measuring means has a sheet thickness measuring means for measuring a resin sheet thickness for each of the sections as the parameter. 9. The resin sheet heating apparatus according to claim 1, wherein the parameter measuring unit has a sheet strain measuring unit that measures a sheet strain for each of the sections as the parameter. 10. The sheet temperature measuring means is capable of measuring the sheet temperature for each section of the resin sheet whose conveying direction is divided into a predetermined range, and the heating means corresponds to each section in the conveying direction. 10. The resin sheet of each section is heated and controlled on the basis of the sheet temperature of each section measured by the sheet temperature measuring means. The resin sheet heating device according to any one of claims. 11. The resin sheet heating apparatus according to claim 10, wherein the heating unit executes the heating control so that the sheet temperature is gradually cooled in the conveying direction. 12. A plurality of transport rolls for transporting the loaded resin sheet while placing the loaded resin sheet are provided in the transport direction, and the temperature of each transport roll is adjusted corresponding to the heating control by the heating means. The resin sheet heating apparatus according to claim 11, wherein the heating is performed. 13. A three-stage roll for transporting the resin sheet, which is carried in, while winding the resin sheet,
The resin sheet heating device according to any one of claims 2 to 12, wherein the sheet temperature measuring means measures a sheet temperature of the resin sheet wound around at least one roll. 14. The resin sheet heating device according to claim 1, further comprising a conveying unit that clamps and holds the substantially peripheral edge of the carried-in resin sheet and conveys the resin sheet. . 15. The resin sheet heating device according to claim 1, further comprising a sheet width expanding means for expanding the sheet width of the carried-in resin sheet. 16. The resin sheet heating device according to claim 1, wherein the resin sheet is made of an optical material. 17. A resin sheet heating method for heating a loaded resin sheet to reduce distortion of the resin sheet, wherein a predetermined parameter is set for each section of the resin sheet divided in a width direction into a predetermined range. A parameter measuring step of measuring, and a heating step of being arranged corresponding to the section and heating controlling the resin sheet of each section based on the parameter of each section measured in the parameter measuring step. A method for heating a resin sheet, comprising: 18. A resin sheet manufacturing method for manufacturing a resin sheet in which distortion of the resin sheet is reduced by heating the carried resin sheet, wherein the resin sheet is divided into a predetermined range in the width direction. A resin sheet is generated by measuring a predetermined parameter for each section and heating-controlling the resin sheet of each section based on the measured parameter for each section that is arranged corresponding to the section Method for manufacturing resin sheet. 19. The manufacturing is performed by dividing a width direction into a predetermined range, measuring a predetermined parameter for each section, and controlling heating of each section based on the measured parameter for each section. A resin sheet characterized by being processed.