JPH081774A - Roll fixing method - Google Patents

Abstract

PURPOSE:To provide gap prescribing function to a block type molding roll without applying conventional jig fixing processing. CONSTITUTION:In a method for fixing a columnar roll constituted by combining a plurality of blocks 11, the roll 10 is fixed by fixing jigs 14 each having an outer diameter larger than the diameter of the roll.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing a cylindrical roll formed by combining a plurality of blocks, and more particularly to a method for fixing a forming roll with a stamper used for continuously forming a forming pattern. is there.

[0002]

2. Description of the Related Art At present, resin molding is widely and generally used, and various manufacturing methods are known. The manufacturing method is compression molding (Co
mpression Mold) method, injection molding (Injection Mold) method in which a molten plastic material is injected and solidified in a mold with a stamper, 2P (PhotoPolymerization) method of transferring a pattern using an ultraviolet curing resin, and a pattern is arranged. A casting (Casting Mold) method in which a molten plastic material is poured into an installed mold and solidified and then demolded can be used. In addition, among the molding methods, molding of particularly fine shapes has made remarkable progress and many proposals have been made. In recent years, a method of performing continuous fine molding has been proposed in order to reduce the cost and improve the mass productivity.
The most typical method is, as in Japanese Patent Laid-Open No. 3-113750, extruding a molten resin from a die to form a resin sheet, and before the sheet is cured, a forming roll with a stamper and a facing roller. It is a method of pressing this with a roll arranged in parallel and transferring the pattern to this resin sheet.

The stamper roll used in this continuous forming method has been produced by a method of winding a long stamper having a circumferential length around a cylindrical roll or a method of cutting a forming pattern on the body of the circumferential roll.

However, the conventional forming roll with a stamper has been manufactured by first milling the roll into a perfect circle, then producing a long stamper, finishing it into a hyperplane, and fixing it to the roll. Since the shaving process requires high accuracy, it is very costly. Moreover, if the roll is distorted or scratched at one place, the roll itself needs to be replaced. Further, the stamper has a plurality of patterns arranged, and if one of them is damaged, the stamper as a whole has to be discarded.

As described above, both the conventional rolls and stampers are costly systems with no maintenance. Then, the inventors of the present invention invented a forming roll with a stamper in which the roll is formed by combining a plurality of blocks to solve the above problem.

That is, by changing a roll that has been a single cylinder up to now into a roll in which a plurality of blocks are combined, the size becomes easy to handle and processing becomes easy. When it occurs in a part of the stamper, it is possible to replace only the block of the damaged part, which enables partial maintenance of the stamper roll.

[0007]

Conventionally, as a problem of the continuous extrusion molding method, the accuracy of the roll gap is caused by the eccentricity of the roll itself or the thermal expansion of the roll itself / roll fixing part / wedge for adjusting the roll gap. Since the adjustment is difficult and the gap variation is large, the plate thickness of the molded product may change, and birefringence and uneven transfer may occur. As a countermeasure against this, a method of defining a roll gap in which a gap adjusting section is provided is proposed in Japanese Patent Laid-Open No. 4-31726.

In the continuous extrusion molding method, when a gap defining jig that defines the gap between adjacent rolls is attached to the forming roll, a jig fixing process is performed on the roll in order to fix the defining jig. Was necessary. In addition to the high cost of this processing, the roll was often deformed by post-processing.

When the block type forming roll according to the present invention is subjected to the belt fixing process, the advantage of the block type forming roll that each block can be used at any roll position is lost.

It is an object of the present invention to provide a block forming roll according to the present invention with a gap defining function without performing a conventional jig fixing process.

[0011]

The present invention for achieving the above object provides a method for fixing a cylindrical roll formed by combining a plurality of blocks, wherein a roll is fixed by a fixing jig having an outer diameter larger than the diameter of the roll. Is a method of fixing a roll.

Further, the fixing method of the present invention includes fixing one end of the ring to one end and fixing both ends of the roll with two fixing jigs having a rotation axis on the closed surface. Further, the fixing method of the present invention includes fixing the roll by fitting the roll into the two circular rings.

Further, the fixing method of the present invention includes that the roll is a molding roll with a stamper for producing a substrate of an optical recording medium.

[0014]

By constructing a roll by combining a plurality of blocks, it becomes possible to process each block, which facilitates handling in terms of size and workability. Further, when inconvenience such as distortion or scratches occurs in a part of the roll or the stamper, only the block of the damaged part can be replaced, so that the stamper roll can be partially maintained.

Further, the jig for fixing the roll, which is a combination of the blocks, has the above-mentioned structure, so that the fixing jig can have the gap defining function at the same time.

Therefore, since it is not necessary to separately provide a gap defining jig on the roll and it is not necessary to perform the gap defining jig mounting process on the roll, the problem of roll deformation due to post-processing is solved and molding stability is improved. Is significantly improved.

The present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view showing an example of the roll fixing method of the present invention, (a) is a plan view and (b) is a conceptual view.

In FIG. 1, 10 is a forming roll with a stamper, 11 is a block that constitutes the roll (hereinafter referred to as roll block), 12 is a stamper, 13 is a rotating shaft, and 14
Is a fixing jig.

Roll block 11 constituting a forming roll
The shape may be any shape as long as a roll can be formed by combining blocks. In particular, it is preferable that the blocks have the same shape because the blocks can be used without distinction on any part of the roll.

FIG. 2 is a schematic diagram showing a configuration example of the roll block. As shown in (b) and (c) of the same drawing, the roll blocks may be provided with protrusions or built-in portions so that the combination thereof does not collapse.

The roll block may have a solid structure having no cavity as shown in FIG. 2 (a) or may have a structure having a cavity as shown in FIG. 2 (d). The same figure (d ') is A- of the roll block shown in the same figure (d).
It is a B cut surface.

The stamper 12 may be formed by forming a molding pattern on a sheet-like stamper and then fixing it to each block with a screw, an adhesive or the like, or by directly cutting the surface of the roll block body with a diamond tool or the like. Alternatively, the roll block may be coated with a photoresist, patterned by a photolithography process, and etched to form a molding pattern.

As the material of the roll block 11 and the fixing jig 14, metal, semiconductor, dielectric, alloy or the like can be used. In particular, Al, superalloy, die steel (for example,
Maraging steel, Cr steel) and the like are preferable.

As the temperature control of the forming roll, a heater is cast in the block to control the temperature, a temperature control oil is circulated in the cavity of the block,
There can be mentioned a method of forming a block having a function of a heat source.

FIG. 3 is a schematic view showing another example of the roll fixing method of the present invention. In the figure, 30 is a forming roll with a stamper, 31 is a roll block, 32 is a stamper, 3
Reference numeral 3 is a rotary shaft, and 34 is a fixing jig. In this aspect, the roll block can be fixed without screwing.

As a material for such a fixing jig 34,
Metals, semiconductors, dielectrics, alloys, etc. can be used,
In particular, Al, cemented carbide, polyimide resin and the like are preferable.

The molding roll of the present invention is particularly suitable for manufacturing an optical recording medium. 5A and 5B are schematic views showing an optical recording medium pattern-formed by the forming roll of the present invention. FIG. 5A is a plan view of the optical recording medium and FIG. 5B is an enlarged view of a recording area.

[0029]

EXAMPLES The present invention will be described in detail below with reference to examples.

Example 1 A carbon steel 1/8 columnar fan-shaped block (arc diameter 310 mm, length 360 mm) shown in FIG. 2 (a) was prepared and plated with nickel having a thickness of 100 μm. The forming pattern was cut with a diamond bite to produce a roll block with a stamper. As the pattern, a pattern for an optical card having a length of 85 mm and a width of 54 mm as shown in FIG. 5 was provided such that recording tracks were arranged parallel to the axial direction of the roll.

Next, eight roll blocks with stampers were combined to form a cylinder with a stamper (circle diameter 31
A molding roll having a length of 0 mm and a length of 360 mm was prepared. The assembled roll is a fixed disk of carbon steel (circle diameter 311.3 m
m, length 360 mm).

This roll was incorporated into a continuous extrusion molding machine to perform molding. FIG. 4 is a conceptual diagram showing an example of a continuous extrusion molding machine. In the figure, 43 is a melt extruder, 44 is a forming roll, 41 is a forming roll with a stamper, 42 is a forming resin sheet, and 45 is a die. Polycarbonate resin (S-2000R manufactured by Mitsubishi Gas Chemical Co., Ltd., release agent 0.1
%), And the extruder has a screw diameter of 65
mmφ extruder (Hitachi Zosen SHT65 type),
The T-die used had a lip surface length of 300 mm. still,
Molding was performed at a T-die temperature of 320 ° C. and a molding speed of 3 m / min to obtain an optical card substrate having a thickness of 400 μm and a birefringence of 20 nm or less. The molding stability was very good.

Example 2 Cr steel was used to produce a 1/8 columnar fan-shaped block (circular diameter 310 mm, length 360 mm) shown in FIG. 2 (d).
The stamper was arranged on the roll by using an adhesive by the method described in JP-A-3-185645 and JP-A-3-95738. As the pattern, a pattern for an optical card having a length of 85 mm and a width of 54 mm as shown in FIG. 5 was provided such that recording tracks were arranged parallel to the axial direction of the roll. Roll block 8 with each stamper
Cylinder with stamper (circle diameter 310m
m, length 360 mm) to prepare a molding roll. The assembled roll was used as a block fixing disk (circle diameter 311.
3 mm, length 360 mm) and fixed with screws.

The cavity inside the roll was filled with a molding temperature control oil (Diamond Thermonto oil manufactured by Mitsubishi Petroleum) and used for temperature control. This roll was incorporated into the continuous extrusion molding machine shown in FIG. 4, and resin molding was performed to produce an optical card substrate. Polycarbonate (AD5503 manufactured by Teijin Chemicals) is used as the resin, and an extruder having a screw diameter of 65 mmφ (SHT65 manufactured by Hitachi Zosen Sangyo Co., Ltd. is used as the extruder.
The mold) and the T-die used had a lip surface length of 300 mm. In addition, T die temperature = 320 ° C., molding speed = 3 m / mi
The temperature control oil of the roll block was controlled so that the surface temperature of the roll was 170 ° C.

As a result, an optical card substrate having a thickness of 400 μm and a birefringence of 20 nm or less was obtained. Also, the molding stability was very good.

Comparative Example 1 A block-type stamper-equipped forming roll was prepared by fixing both ends of the roll with a fixing jig having an outer diameter equal to the roll diameter. FIG. 6 is a schematic view showing the produced roll. This roll was incorporated into the continuous extrusion molding machine shown in FIG. 4, and resin molding was performed to produce an optical card substrate. Polycarbonate as resin (AD5 manufactured by Teijin Kasei
503) and the extruder has a screw diameter of 65 mm.
A φ extruder (SHT65 type manufactured by Hitachi Zosen Sangyo) and a T die having a lip surface length of 300 mm were used. The T-die temperature was 320 ° C., the molding speed was 3 m / min, and the surface temperature of the roll was 170 ° C. As a result, an optical card substrate was obtained.

Comparative Example 2 A gap-fixing jig was attached to a block type stamper-equipped forming roll by a conventional gap-defining jig attachment process. This was incorporated into a continuous extrusion molding machine as shown in FIG. 4, and resin molding was performed to produce an optical card substrate. Polycarbonate (AD5503 manufactured by Teijin Chemicals) is used as the resin, and the extruder has a screw diameter of 6
Extruder of 5mmφ (SHT65 type manufactured by Hitachi Zosen), T
The die used had a lip surface length of 300 mm. still,
T-die temperature = 320 ° C., molding speed = 3 m / min, and roll surface temperature was controlled to 170 ° C. result,
An optical card substrate was obtained.

Example 3 Using carbon steel, a fan-shaped block (columnar diameter 310 mm, length 360 mm) of the cylinder 1/8 shown in FIG. 2 (a) was prepared and plated with nickel having a thickness of 100 μm. A molding pattern was cut on the surface with a diamond bite to prepare a molding block with a stamper. As the pattern, a pattern for an optical card having a length of 85 mm and a width of 54 mm as shown in FIG. 5 was provided such that recording tracks were arranged parallel to the axial direction of the roll.

Next, eight roll blocks with stampers are combined to form a cylinder with a stamper (circle diameter 31
A molding roll having a length of 0 mm and a length of 360 mm was prepared. Assembled roll with stainless steel fixed belt (inner diameter 3
The block was fixed integrally including 10 mm and a thickness of 65 μm).

This roll was incorporated into the continuous extrusion molding machine shown in FIG. 4 for molding. Polycarbonate resin (S-2000R manufactured by Mitsubishi Gas Chemical Co., Ltd., release agent 0.1
% Contained) and the extruder has a screw diameter of 65 mm.
A φ extruder (SHT65 type manufactured by Hitachi Zosen Sangyo) and a T die having a lip surface length of 300 mm were used. Molding was performed at a T-die temperature of 320 ° C. and a molding speed of 3 m / min to obtain an optical card substrate having a thickness of 400 μm and a birefringence of 20 nm or less. The molding stability was very good.

Example 4 A 1/8 columnar fan-shaped block (circular diameter 310 mm, length 360 mm) shown in FIG. 2D was made of Cr steel.
The stamper was arranged on the roll by using an adhesive by the method described in JP-A-3-185645 and JP-A-3-95738. As the pattern, a pattern for an optical card having a length of 85 mm and a width of 54 mm as shown in FIG. 5 was provided such that recording tracks were arranged parallel to the axial direction of the roll. Roll block 8 with each stamper
Cylinder with stamper (circle diameter 310m
m, length 360 mm) to prepare a molding roll. Assembled roll with stainless steel fixed belt (ring inner diameter 310m
m, thickness 65 μm) and the block was fixed.

The cavity inside the roll was filled with a molding temperature control oil (Diamond Thermo Oil, manufactured by Mitsubishi Petroleum) and used for temperature control. This roll was incorporated into the continuous extrusion molding machine shown in FIG. 4, and resin molding was performed to produce an optical card substrate. Polycarbonate (AD5503 manufactured by Teijin Chemicals) is used as the resin, and the extruder has a screw diameter of 65 mmφ (SHT65 type manufactured by Hitachi Zosen Industry),
The T-die used had a lip surface length of 300 mm.
Molding was performed at a T-die temperature of 320 ° C. and a molding speed of 3 m / min, and the roll block temperature control oil was controlled so that the surface temperature of the roll was 170 ° C.

As a result, an optical card substrate having a thickness of 400 μm and a birefringence of 20 nm or less was obtained. Also, the molding stability was very good.

Table 1 shows the results of comparison between Examples 1 to 4 and Comparative Examples 1 and 2.

[0045]

[Table 1]

[0046]

As described above, according to the present invention, there is an advantage that the roll can be handled in a block unit having a size that is easy to handle, and processing can be easily performed.

Further, since it is possible to replace only the block in the portion where the inconvenience such as the distortion or the scratch has occurred, it is possible to partially maintain the roll. Up to now, when the roll is distorted or damaged, it is necessary to replace all the rolls. However, according to the present invention, only the damaged roll block needs to be replaced.
It became / 4 to 1/8.

Further, according to the present invention, since the fixing jig has a gap defining function, it is not necessary to separately provide a gap defining jig on the roll, and it is necessary to perform a gap defining jig mounting process on the roll. Nor. Therefore, there is no roll deformation due to post-processing, the molding stability is remarkably improved, and the gap regulation makes it possible to manufacture a substrate with higher thickness accuracy.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a roll fixing method according to the present invention.

FIG. 2 is a schematic view showing a configuration example of a block forming a forming roll according to the present invention.

FIG. 3 is a schematic view showing another example of the roll fixing method according to the present invention.

FIG. 4 is a conceptual diagram showing an example of a continuous molding manufacturing method according to the present invention.

FIG. 5 is a schematic view showing an example of a molding pattern according to the present invention.

FIG. 6 is a schematic view showing a roll fixing method in a comparative example.

[Explanation of symbols]

 10 forming roll with stamper 11 roll block 12 stamper 13 rotating shaft 14 fixing jig 30 forming roll with stamper 31 roll block 32 stamper 33 rotating shaft 34 fixing jig 41 forming roll with stamper 42 molding resin sheet 43 melt extruder 44 forming roll 45 die 51 optical card pattern 52 optical recording area 53 recording track 54 preformatted track 55 preformatted pit

Claims (4)

[Claims] 1. A method for fixing a cylindrical roll formed by combining a plurality of blocks, wherein the roll is fixed by a fixing jig having an outer diameter larger than the diameter of the roll. 2. The roll fixing method according to claim 1, wherein one end of the ring is closed, and both ends of the roll are fixed by two fixing jigs having a rotation axis on the closed surface. 3. The roll fixing method according to claim 1, wherein the roll is fixed by fitting the roll into two circular rings. 4. The roll fixing method according to claim 1, wherein the roll is a forming roll with a stamper for producing a substrate of an optical recording medium.