JP2008310881A - Slip prevention sheet and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slip prevention sheet which has the optimum frictional force without using a rubber material which can cause a contamination of a device, excellent durability, satisfactory thickness accuracy and a shape maintaining property, can be easily stuck to a turntable and can be simply manufactured at low costs. <P>SOLUTION: A slip prevention mechanism part formed on a supporting body has a dot layer formed so as to be scattered in an island shape on one plane of the supporting body and the dot layer is formed by using an amorphous polyester resin. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is an anti-slip device which is attached to a mounting surface of a turntable on which a recording disk such as a CD or a DVD is mounted, and which is used to prevent slipping and surface runout when the recording disk is rotated. The present invention relates to a sheet and a manufacturing method thereof.

  On the mounting surface of the turntable on which a recording disk such as a CD or DVD, which is a medium for recording / reproducing information such as characters, sounds, images, etc., slips when rotating the recording disk, A ring-shaped anti-slip sheet is fixed to prevent surface runout.

  FIG. 3 shows an example of a disk drive device 50 including a turntable to which an anti-slip sheet is attached.

  When the recording disk 70 is supplied and placed on the turntable 53, the clamp member 56 is lowered, and the recording disk 70 is positioned by the clamp member 56 due to the attractive force generated between the magnetic body 55 and the magnet 57. Then, the recording disk 70 is rotated in accordance with the rotational drive of the motor 54 while being fixed while being sandwiched between the anti-slip sheet 10 fixedly placed on the turntable 53 and the clamp member 56. At this time, the anti-slip sheet 10 mainly acts to prevent the recording disk 70 from slipping or running out.

  Examples of the anti-slip sheet of the present invention and, in particular, related techniques include Patent Documents 1 to 2 listed below.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-110868) has good thickness accuracy and shape-retaining properties, is easy to stick to a turntable, has no poor mounting, and has excellent workability. For the purpose of providing an anti-slip sheet that can prevent rust, a reinforcing sheet made of a plastic film is laminated on the back surface of a friction sheet made of a urethane resin having a rough surface, and an adhesive layer and release paper are laminated on the reinforcing sheet. A proposal of a laminated anti-slip sheet has been made. However, in this proposal, when manufacturing a friction sheet having a rough surface, a transfer method from a transfer sheet processed into a rough surface is used, and it cannot be said that productivity is good. In addition, a friction sheet made of a urethane resin cannot always exhibit a good anti-slip function.

  Further, Patent Document 2 (Japanese Patent Laid-Open No. 6-290537) aims at providing a turntable slip prevention mechanism with a simple surface with good surface roughness and a high friction coefficient. A technique has been disclosed in which a liquid rubber or thermoplastic resin agent is attached to a mounting surface in the form of a print or spray, and is cured and bonded by heating or drying to form a non-slip coating on the turntable surface. Yes. However, in the above method, it is necessary to perform a process for forming a non-slip coating directly on the disk mounting surface of the turntable, which means that productivity is difficult. Further, the adhesion between the turntable and the anti-slip coating is not sufficient, and it can be said that there is a problem in durability.

JP 2004-110868 A JP-A-6-290537

  Under such circumstances, the present invention has been invented, and its purpose is to have optimum frictional force and excellent durability without using a rubber material that may cause contamination of the apparatus. Another object of the present invention is to provide an anti-slip sheet having good thickness accuracy, easy shape retention, easy attachment to a turntable, and simple and inexpensive to manufacture, and a method for manufacturing the same.

  In order to solve such a problem, the present invention is an anti-slip device that is attached to a mounting surface of a turntable on which a recording disk is mounted to prevent slipping when the recording disk rotates. The anti-slip sheet comprises a support, an anti-slip mechanism formed on one plane of the support, and an adhesive layer formed on the other plane of the support, The anti-slip mechanism portion includes a dot layer formed so as to be scattered in an island shape on one plane of the support, and the dot layer is formed from an amorphous polyester resin.

  As a preferred embodiment of the present invention, the amorphous polyester resin is configured to have physical properties such that a glass transition temperature Tg is 8 ° C. or less and an acid value is 2 KOHmg / g or less. .

  Moreover, as a preferable aspect of the present invention, the dot layer formed so as to be scattered in an island shape on one plane of the support is configured to be a layer formed by screen printing.

  Moreover, as a preferable aspect of the present invention, the support is configured to be formed of a polyester resin film.

  As a preferred embodiment of the present invention, the polyester resin film is configured to be one selected from polyethylene terephthalate, polyethylene terephthalate, polybutylene terephthalate, and polybutylene terephthalate.

  As a preferred aspect of the present invention, the dot layer constituting the anti-slip mechanism is configured to have a thickness of 5 to 50 μm.

  Moreover, as a preferable aspect of the present invention, a release paper is formed on the side of the adhesive layer opposite to the support side.

  The present invention is a manufacturing method of the above-described anti-slip sheet, which includes an anti-slip mechanism part forming step of forming an anti-slip mechanism part on one plane of a support by a screen printing method, and a release paper A pressure-sensitive adhesive layer forming step of applying and forming a pressure-sensitive adhesive layer thereon, the other flat surface on which the anti-slip mechanism portion of the support is not formed, and a flat surface on which the release paper of the pressure-sensitive adhesive layer is not formed And a laminating and integrating step of laminating using the adhesive strength of the adhesive layer.

  The disk drive device of the present invention is configured to include a turntable to which the above-described anti-slip sheet is fixed.

  The anti-slip sheet of the present invention is used to prevent slip when the recording disk rotates by being attached to the mounting surface of the turntable on which the recording disk is mounted. Comprises a support, an anti-slip mechanism portion formed on one plane of the support, and an adhesive layer formed on the other plane of the support, the anti-slip mechanism portion of the support Consists of dot layers formed so as to be scattered in islands on one plane, and the dot layer is formed of an amorphous polyester resin. Without the use of rubber materials that can cause nation, it has optimum frictional force, excellent durability, good thickness accuracy, shape retention, and easy attachment to a turntable. There extremely excellent effect that it is inexpensive and simple to express.

Hereinafter, the best mode for carrying out the present invention will be described.
First, a disk drive device in which the slip prevention sheet of the present invention is used will be described.

[ Description of Disk Drive Device 50 ]
FIG. 3 shows an example of a disk drive device 50 including a turntable 53 to which the anti-slip sheet 10 of the present invention is attached.

  As shown in FIG. 3, in the disk drive device 50, for example, a turntable 53 is fixed to a drive shaft 54 that protrudes from an upper portion of a motor 52, and the turntable 53 can rotate as the motor 54 rotates. ing.

  An anti-slip sheet 10 formed in a ring shape is fixed on the mounting surface 53 a of the turntable 53 in the example of FIG. 3, and a magnetic body 55 is concentrically formed at a substantially central portion of the turntable 53. Buried.

  As shown in FIG. 3, a clamp member 56 is concentrically disposed so as to face the turntable 53, and a magnet 57 is concentrically arranged on the clamp member 56 at a position facing the magnetic body 55. Buried and placed.

  When the recording disk 70 is supplied and placed on the turntable 53, the clamp member 56 is lowered, and the recording disk 70 is clamped by the attraction force generated between the magnetic body 55 and the magnet 57. And the turntable 53. Strictly speaking, the recording disk 70 is temporarily fixed while being sandwiched between the anti-slip sheet 10 fixedly placed on the turntable 53 and the clamp member 56.

  In this state, the recording disk 70 is rotated by driving the motor 54 to rotate. At this time, the anti-slip sheet 10 acts to prevent the recording disk 70 from slipping or running out.

  The recording disk 70 is, for example, a disk used for information recording or information reproduction, and in particular, any size, thickness, etc. can be used.

[ Explanation regarding the slip prevention sheet 10 ]
Next, the anti-slip sheet 10 used by being fixed to the turntable 53 of the disk drive device 50 will be described in detail.

  The anti-slip sheet 10 is used to prevent slipping when the recording disk 70 is sandwiched as described above and is rotated.

  FIG. 1 is a cross-sectional view showing a state of one anti-slip sheet 10 punched out in a ring shape from a manufactured sheet-like material, and before performing affixing operation on the mounting surface 53a of the turntable 53. It is sectional drawing which shows a state.

  As shown in FIG. 1, the anti-slip sheet 10 is formed on the support 12, the anti-slip mechanism 13 formed on one flat surface 12 a of the support 12, and the other flat surface 12 b of the support 12. An adhesive layer 11 is provided.

  A release paper 14 is formed on the lower surface 11 a of the adhesive layer 11 in FIG. 1 (the surface on the side opposite to the bonding surface with the support 12), but the pasting operation is performed on the mounting surface 53 a of the turntable 53. At this time, the release paper 14 is peeled off and removed, and the lower surface 11 a of the adhesive layer 11 is fixedly adhered to the mounting surface 53 a of the turntable 53.

  The anti-slip sheet 10 has a ring-shaped outer diameter of about 25 to 35 mm and an inner diameter of about 17 to 27 mm.

Anti-slip mechanism 13
As shown in FIG. 1, the anti-slip mechanism 13 has a configuration of a plurality of dot layers 13 (dots) formed so as to be scattered in an island shape on one plane 12 a of the support 12. ing. The dot layers 13 scattered in such island shapes are preferably formed by screen printing from the viewpoint of improving workability and thickness accuracy. The shape of each dot layer 13 is a circular shape, a triangular shape, a quadrangular shape, a pentagonal shape, a hexagonal shape, an octagonal shape as viewed from the plane of the anti-slip sheet 10 (AA arrowed shape in FIG. 1). ... any of polygonal shapes may be used. Usually, a circular shape is desirable.

  Further, as shown in FIG. 1, the cross-sectional shape of the dot layer 13 may be a form in which the central part of the dot layer 13 has a slightly raised top part or a form having a substantially flat flat surface. There may be. Usually, it is desirable that the former has a raised top.

  Further, examples of the arrangement of the dot layers 13 scattered in islands include a square pitch arrangement, a square pitch arrangement (staggered arrangement), a triangle pitch arrangement (staggered arrangement), and the like.

  Such a dot layer 13 is formed from an amorphous polyester resin. The reason for “amorphous” is that a paint suitable for coating printing can be produced, and in particular, the formation of the dot layer 13 by screen printing is ensured.

  Such an amorphous polyester resin has a glass transition temperature Tg of 8 ° C. or less, particularly in a range of −18 to 7 ° C., and an acid value of 2 KOH mg / g or less, particularly 0.1 to 1. Those having physical properties of .9 can be preferably used. When the glass transition temperature Tg exceeds 8 ° C., there is a tendency that moderate elasticity is lost, it becomes difficult to obtain a sufficient friction force, and there is a disadvantage that the function of preventing slip is not sufficient. Further, if the glass transition temperature Tg is too low, there is a tendency that the coating film lacks stability.

  On the other hand, when the acid value exceeds 2 KOHmg / g, it tends to be difficult to obtain a sufficient frictional force.

  By adding a solvent and a curing agent to such an amorphous polyester resin, a coating material for forming the anti-slip mechanism 13 is formed.

  As the solvent, various known solvents such as methyl ethyl ketone, toluene, butyl cellosolve, xylene, cyclohexanone, ethyl acetate, isophorone, propylene glycol monomethyl ether acetate, and butyl cellosolve acetate can be used. As the curing agent, an isocyanate compound, a melamine compound, an epoxy resin, or the like can be used.

  The anti-slip mechanism 13 (dot layer 13) is formed by thermosetting, and can be said to be composed of amorphous thermosetting polyester resin. Durability due to the formation of the dot layer 13 by thermosetting is significantly improved.

  The thermosetting treatment is performed after forming a coating film and drying the coating film, for example, at a temperature of 120 to 170 ° C. for about 5 minutes to 1 hour.

  The thickness of the dot layer 13 is about 5 to 50 μm, and the thickness accuracy in the present invention falls within an error range of ± 10% with respect to the reference thickness.

Support 12
The support 12 is not particularly limited as long as it has a plate shape capable of maintaining a certain form, but durability (delamination) at an adhesive portion with the anti-slip mechanism portion 13 made of an amorphous polyester resin is not particularly limited. In view of the durability of the polyester resin film, it is preferable that the polyester resin film is used.

  Examples of the polyester resin film include polyethylene terephthalate, polyethylene terephthalate, polybutylene terephthalate, and polybutylene terephthalate.

  The thickness of the support 12 is about 50 to 200 μm. Further, the overall thickness of the anti-slip sheet 10 can be adjusted by adjusting the thickness of the support 11 used.

Adhesive layer 11
The pressure-sensitive adhesive layer 11 has a strong adhesion to the support 12, and the lower surface 11 a of the pressure-sensitive adhesive layer 11 is made of a material that can be firmly fixed to the mounting surface 53 a of the turntable 53. Specifically, acrylic, silicone, rubber (butyl rubber) and the like adhesive layers can be exemplified.

  The thickness of such an adhesive layer 11 is about 30 to 70 μm.

Release paper 14
The release paper 14 has a suitable adhesive force with the pressure-sensitive adhesive layer 11 and is made of a material that can be easily peeled off from the pressure-sensitive adhesive layer 11 when the anti-slip sheet 10 is attached to the mounting surface 53 a of the turntable 53.

  The thickness of the release paper 14 is usually about 50 to 150 μm.

[Description of manufacturing method of anti-slip sheet]
The anti-slip sheet described above can be produced by the following preferred method.

  First, as shown in the upper part of FIG. 2, an anti-slip mechanism 13 (a plurality of dot layers 13) is formed by screen printing on one plane of a belt-like support 12 that is continuously conveyed (slip). Prevention mechanism part forming step).

  Further, as shown in the lower part of FIG. 2, the adhesive layer 11 is applied by coating on the release paper 14 that is continuously conveyed and dried (adhesive layer forming step).

  Thereafter, the two laminates are joined while being continuously conveyed. That is, the other flat surface 12b of the support 12 where the anti-slip mechanism 13 is not formed and the flat surface 11b of the adhesive layer 11 where the release paper 14 is not formed are attached using the adhesive force of the adhesive layer 11. Combined (bonding integration process). In pasting, a pressurizing operation is usually performed.

  In this way, the integrated laminate after the laminating and integrating step is punched into the shape of an individual ring-shaped anti-slip sheet as shown in the overall view of FIG. The prevention sheet 10 is completed.

  When performing the operation of attaching the anti-slip sheet to the mounting surface 53 a of the turntable 53, the release paper 14 is peeled off and removed, and the lower surface 11 a of the adhesive layer 11 is bonded to the mounting surface 53 a of the turntable 53. The

Hereinafter, the present invention will be described in more detail with reference to specific examples.
(Experimental example 1)
A paint corresponding to the anti-slip mechanism 13 was prepared in the following manner.

Formulation of paint・ Base resin listed in Table 1 64 parts by weight ・ Solvent 36 parts by weight ・ Curing agent (isocyanate compound: Coronate L) 5 parts by weight

  The above paint is thinly applied with a doctor knife on a 75 μm thick polyethylene terephthalate (PET) film, dried for 150 minutes at 150 ° C. after the coating film is dried (crosslinked), and slipped about 30 μm thick. The prevention mechanism part was formed, and various samples as shown in Table 1 were prepared. The sample was punched and cut to a size of 63 mm × 63 mm.

About each of these samples, the friction test was done in the following way.
(Friction test)
The bottom surface of the weight having a weight of 202 g and the PET surface constituting the sample shown in Table 1 were attached with a double-sided tape. Using an apparatus as shown in FIG. 4, the friction characteristic (maximum frictional force-static friction) between the SUS plate as the lower plate and the coating film surface (corresponding to the anti-slip mechanism 13) constituting the sample is measured, The frictional force (N) was determined. The test speed for dragging the sample was 50 mm / min. The shape of the weight was a rectangular parallelepiped, and the bottom size was 63 mm × 63 mm.
The results are shown in Table 1 below.

  In addition, regarding the above samples 1 and 2, a sample having a form close to actual use was created and mounted on a disk drive device for experiments. That is, on a support made of a polyethylene terephthalate (PET) film having a thickness of 75 μm, the anti-slip mechanism 13 having a thickness of 10 μm is formed by screen printing, and an adhesive layer having a thickness of 50 μm is formed on the back surface of the support. Affixed ring-shaped anti-slip sheet (outer diameter 28 mm, inner diameter 20 mm) was prepared, and this was adhered to the mounting surface of the turntable and attached to the disk drive. Temperature 60 ° C., humidity 90% RH In a harsh environment, a durability test of continuous driving for 2000 hours was conducted. As a result, no abnormality such as delamination occurred and it was confirmed that the durability was extremely excellent.

  From the above results, the effects of the present invention are clear. That is, the anti-slip sheet of the present invention is used to prevent slip when the recording disk rotates by being attached to the mounting surface of the turntable on which the recording disk is mounted. The prevention sheet includes a support, an anti-slip mechanism formed on one plane of the support, and an adhesive layer formed on the other plane of the support, and the anti-slip mechanism is supported Since the device has a dot layer formed so as to be scattered in islands on one plane of the body, and the dot layer is formed from an amorphous polyester resin, the device Without the use of rubber materials that can cause contamination, it has optimum frictional force, excellent durability, good thickness accuracy, shape retention, and easy attachment to a turntable. Moreover extremely excellent effect that production is inexpensive simple is expressed.

  The present invention is applicable to the disk drive industry.

It is sectional drawing which shows the state of the one slip prevention sheet punched in the ring shape from the manufactured sheet-like object. It is drawing for demonstrating an example of the manufacturing method of a slip prevention sheet. 1 is a half-sectional view illustrating an example of a disk drive device including a turntable to which an anti-slip sheet of the present invention is attached and fixed. It is a schematic drawing of an apparatus for explaining a friction test.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Anti-slip sheet 11 ... Adhesive layer 12 ... Support body 13 ... Anti-slip mechanism part 13 (dot layer 13)
14 ... Release paper 50 ... Disk drive

Claims (9)

An anti-slip sheet that is attached to a mounting surface of a turntable on which a recording disk is mounted and used to prevent slipping when the recording disk rotates.
The anti-slip sheet is
A support;
An anti-slip mechanism formed on one plane of the support;
An adhesive layer formed on the other plane of the support,
The anti-slip mechanism is configured to have a dot layer formed so as to be scattered in an island shape on one plane of the support, and the dot layer is formed of an amorphous polyester resin. Anti-slip sheet characterized by   2. The anti-slip sheet according to claim 1, wherein the amorphous polyester resin has physical properties of a glass transition temperature Tg of 8 ° C. or less and an acid value of 2 KOH mg / g or less.   The anti-slip sheet according to claim 1 or 2, wherein the dot layer formed so as to be scattered in an island shape on one plane of the support is a layer formed by screen printing.   The anti-slip sheet according to any one of claims 1 to 3, wherein the support is composed of a polyester resin film.   The anti-slip sheet according to claim 4, wherein the polyester-based resin film is one selected from polyethylene terephthalate, polyethylene terephthalate, polybutylene terephthalate, and polybutylene terephthalate.   The anti-slip sheet according to any one of claims 1 to 5, wherein a thickness of a dot layer constituting the anti-slip mechanism is 5 to 50 µm.   The anti-slip sheet according to any one of claims 1 to 6, wherein a release paper is formed on a side opposite to the support side of the adhesive layer. It is a manufacturing method of the slip prevention sheet according to claim 7,
The method
An anti-slip mechanism part forming step of forming an anti-slip mechanism part on one plane of the support by a screen printing method;
An adhesive layer forming step of forming an adhesive layer on a release paper by applying the adhesive layer;
A bonding integration step of bonding the other plane of the support on which the anti-slip mechanism portion is not formed and the plane on which the release paper of the adhesive layer is not formed using the adhesive force of the adhesive layer; ,
A method for producing an anti-slip sheet comprising:   7. A disk drive device comprising a turntable to which the anti-slip sheet according to claim 1 is fixed.

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