JP2013107168A - Glass polishing method and laminated sheet used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass polishing method capable of preventing breakage of glass when separating the glass from a pad after polishing the glass.SOLUTION: The glass polishing method includes steps of: attaching a laminated sheet 2 comprising at least a urethane sheet 20 and an elastomer sheet 21 to a surface of a surface plate 1; attaching the glass G to be polished to a surface of the laminated sheet 2; polishing a surface of the glass G; separating an end portion of the laminated sheet 2 together with the glass G from the surface plate 1, after the polishing step; and detaching only the glass G from the laminated sheet 2 after forming an air layer A between the glass G and the laminated sheet 2 halfway in the peeling step. The urethane sheet 20 comprises a surface skin layer 20a and a cell layer 20b, with the glass G attached to the surface skin layer 20a side, and with the elastomer sheet 21 coupled with the cell layer 20b side.

Description

  The present invention relates to a method for polishing glass using a laminated sheet.

  Such a glass polishing method will be briefly described with reference to FIG. This glass polishing apparatus includes a glass holding unit 100 and a glass polishing unit 200. The glass holding unit 100 includes a metal surface plate 1, a holding pad 2 attached on the surface plate 1, and a glass G attached on the holding pad 2. The surface plate 1 is configured to be movable by an arm 101. As an example of the holding pad 2, for example, one disclosed in Patent Document 1 below is known.

  A polishing pad 201 is attached to the glass polishing unit 200 and is configured to be rotatable by a motor (not shown). When glass polishing is actually performed, the glass holding unit 100 and the glass polishing unit 200 face each other, and the surface of the glass G is polished by the polishing pad 201. After the polishing, the glass holding unit 100 and the glass polishing unit 200 are separated again, and the glass G is peeled from the holding pad 2.

  Here, FIG. 6 shows a state when peeling. Hold the end of the glass G by hand and gradually peel it off the holding pad 2. Here, in order to relieve the close contact state between the glass G and the holding pad 2, air may be sent between the glass G and the holding pad 2 by an air gun.

JP 2006-326714 A

However, the above configuration has the following problems. When the glass G is peeled off gradually in order to peel off the glass G, there is a possibility that the glass G will be broken by the force of peeling off to the front. Moreover, when air is sent with an air gun, the glass G vibrates and the glass G may break. The glass G to be polished is thin and has a thickness of about 0.3 mm. And the request | requirement of further thickness reduction further increases the probability that the glass G will break.

  This invention is made | formed in view of the said situation, The subject is the glass polishing method which can prevent a crack of glass, and the laminated sheet used for this when glass is peeled from a pad after glass polishing. Is to provide.

In order to solve the above problems, the glass polishing method according to the present invention comprises:
At least a step of attaching a laminated sheet consisting of a urethane sheet and an elastomer sheet to the surface of the surface plate;
Attaching the glass to be polished to the surface of the laminated sheet;
Polishing the surface of the glass;
After the polishing step, the step of peeling the edge of the laminated sheet from the surface plate together with the glass,
After forming an air layer between the glass and the laminated sheet in the middle of the peeling step, and separating only the glass from the laminated sheet,
The urethane sheet has a laminated structure of a surface skin layer and a cell layer, and the glass is attached to the surface skin layer side.

  The operation and effect of the glass polishing method having such a configuration will be described. First, a laminated sheet is affixed on a surface plate, and further, a glass to be polished is further affixed thereon. The order in which these are pasted is not limited to the above order. In this state, the glass is polished with a polishing pad, and after polishing, the glass needs to be peeled off from the laminated sheet. At this time, first, both the glass and the laminated sheet are peeled off from the surface plate. In this peeling step, an air layer is formed between the glass and the laminated sheet due to the difference in flexural rigidity between the glass and the laminated sheet. If it will be in this state, glass can be naturally separated from a lamination sheet. Thus, since the glass can be peeled without difficulty, the probability that the glass will break can be reduced. As a result, it is possible to provide a glass polishing method capable of preventing breakage of glass when glass is peeled from a sheet after glass polishing.

In order to solve the above problems, the laminated sheet according to the present invention is
The urethane sheet is composed of at least a urethane sheet and an elastomer sheet, and the urethane sheet has a laminated structure of a surface skin layer and a cell layer, and the glass is pasted on the surface skin layer side. Is.

  The actions and effects of this configuration are as described above, and the glass can be peeled without difficulty, so that the probability of breaking the glass can be reduced. Moreover, glass can be affixed using the adsorption | suction characteristic of the skin layer of a urethane sheet. Furthermore, the unevenness | corrugation which exists on the surface of an elastomer sheet can be absorbed with a cell layer by couple | bonding the cell layer side of a urethane sheet with an elastomer sheet. Thereby, glass can be hold | maintained on the surface of a lamination sheet in a flat state.

Conceptual diagram showing the configuration of the glass polishing equipment The figure which shows the section composition of a lamination sheet The figure explaining the effect of a lamination sheet Side view showing the state when the glass is set on the surface plate The figure which shows the procedure when peeling glass from a lamination sheet The figure which shows the procedure when peeling glass in the prior art The figure which shows the cross-sectional structure of another embodiment of a lamination sheet.

  A preferred embodiment of a glass polishing method and apparatus according to the present invention will be described with reference to the drawings. The configuration of the glass polishing apparatus is the same as that shown in FIG. 1 described in the prior art. The glass to be polished is glass that needs to be polished, and the present invention is useful particularly for thin glass.

<Glass pasting configuration>
FIG. 2 shows a state when the glass G is held in the glass holding unit 100 of the glass polishing apparatus shown in FIG. A laminated sheet 2 is attached to the surface of the surface plate 1, and a glass G is attached to the surface of the laminated sheet 2.

<Configuration of laminated sheet>
A cross-sectional configuration of the laminated sheet 2 is shown in FIG. In the laminated sheet 2, a urethane sheet 20 and an elastomer sheet 21 are laminated, and these are combined by an adhesive layer 22 to be integrated. Or you may adhere | attach and integrate by hot melt. One surface of the elastomer sheet 21 is a surface to be attached to the surface plate 1. The other surface of the elastomer sheet 21 is bonded to the urethane sheet 20 via the pressure-sensitive adhesive layer 22.

  The urethane sheet 20 includes a surface skin layer 20a and a cell layer 20b. Dense fine holes are formed in the surface skin layer 20a. The cell layer 20b is formed inside and has a large number of foam holes. The cell layer side is bonded to the elastomer sheet 21 via the pressure-sensitive adhesive layer 22.

  As the urethane sheet 20, a urethane sheet having a surface skin layer and a cell layer by a wet manufacturing method or a urethane sheet having a surface skin layer and a cell layer by a dry manufacturing method is used. As the elastomer sheet 21, a styrene elastomer sheet or an elastomer sheet made of other materials is used. The laminated sheet 2 is configured by any combination thereof. How to combine them can be determined by the polishing quality and workability required by the operator.

  The elastomer sheet has strong self-adhesiveness and can be attached to the surface plate 1 as it is.

<Operation of laminated sheet>
FIG. 3 is a diagram illustrating the operation of the laminated sheet 2. FIG. 3A shows a case where the glass G is adsorbed only by the elastomer sheet 21. The elastomer sheet 21 can maintain the function of being able to repeatedly adhere to and peel from the surface plate 1 by washing the surface or the like. However, since it does not have a cell layer inside, it has poor elasticity. Therefore, when the elastomer sheet 21 has a slight unevenness, if the glass G is pasted and polished as it is, the smoothness of the polished glass G is uneven. On the other hand, as shown in FIG. 3 (b), the urethane sheet 20 has a cell layer 20b, and by adhering this to the elastomer sheet 21, irregularities are absorbed and the smoothness of the attached glass G is achieved. Polishing work can be performed without giving spots.

<Glass polishing method>
Next, a procedure for actually polishing the glass G will be described. FIG. 4 is a side view showing a state when the glass G is set on the surface plate 1. First, the laminated sheet 2 is attached to the surface of the surface plate 1. The material described above is selected as the material of the laminated sheet 2.

  Next, the glass G is stuck on the surface of the laminated sheet 2. The laminated sheet 2 is formed as a sheet material that matches the shape of the glass G to be polished. The size of the laminated sheet 2 is preferably set to be the same as or slightly larger than the surface area of the glass G. Thereby, it becomes easy to perform an operation when peeling the glass G.

  In the above example, the laminated sheet 2 and the glass G are pasted in order on the surface of the surface plate 1. However, the laminated sheet 2 and the glass G are pasted in advance and are pasted on the surface of the surface plate 1. It may be.

  After the setting as shown in FIG. 4, the surface of the glass G is polished by the polishing pad 201 as shown in FIG. The polishing step can be performed by the same method as before.

<Glass peeling process>
Next, the procedure when the glass G is peeled from the laminated sheet 2 after the polishing step is completed will be described with reference to FIG.

  As shown in FIG. 5A, one of the four corners of the rectangular laminated sheet 2 is held and gradually peeled off. At this time, the laminated sheet 2 and the glass G are peeled together. When peeled by a certain area (about ¼), as shown in FIG. 5B, an air layer A starts to be formed between the glass G and the laminated sheet 2, and the glass G starts to peel from the laminated sheet 2. . This is based on the difference in flexural rigidity between the glass G and the laminated sheet 2.

  If it will be in this state, the peeling operation | movement of the lamination sheet 2 will be complete | finished, and the glass G will be peeled from the lamination sheet 2. FIG. Since the air layer A is formed, it can be peeled off without difficulty. After completely separating the glass G, the laminated sheet 2 is returned to its original state as shown in FIG.

  According to the above method, the glass G can be peeled without using air blow or the like, and the glass G can be prevented from being broken. Therefore, even when thin glass is used, cracking at the time of peeling can be prevented, and the yield can be improved. Further, the time until peeling can be shortened, and the structure of the present invention can be peeled off in a short time and the working efficiency is improved as compared with the case of FIG.

<Embodiment of laminated sheet>
The laminated sheet according to the present invention is not limited to the structure shown in FIG. 2, and may have the structure shown in FIG. In the laminated sheet 2, a PET (polyethylene terephthalate) sheet 23 is interposed between the urethane sheet 20 and the elastomer sheet 21. The PET sheet 23 and the urethane sheet 20 or the elastomer sheet 21 are integrated by adhesion using an adhesive layer 22 or hot melt. Alternatively, the urethane sheet 20 and the elastomer sheet 21 may be directly molded on the PET sheet 23 and integrally bonded. By providing the PET sheet 23, there is an advantage that the deflection strength of the entire laminated sheet is increased.

<Another embodiment>
In the present invention, the laminating sheet 2 and the glass G may be attached and separated, and the glass G may be attached and peeled manually by an operator, or automatically by a machine using a robot. May be.

1 Surface plate 2 Laminated sheet 20 Urethane sheet 20a Surface skin layer 20b Cell layer 21 Elastomer sheet 22 Adhesive layer 23 PET sheet 100 Glass holding part 200 Glass polishing part 201 Polishing pad A Air layer G Glass

Claims (2)

At least a step of attaching a laminated sheet consisting of a urethane sheet and an elastomer sheet to the surface of the surface plate;
Attaching the glass to be polished to the surface of the laminated sheet;
Polishing the surface of the glass;
After the polishing step, the step of peeling the edge of the laminated sheet from the surface plate together with the glass,
After forming an air layer between the glass and the laminated sheet in the middle of the peeling step, and separating only the glass from the laminated sheet,
The urethane sheet has a laminated structure of a surface skin layer and a cell layer, and the glass is pasted on the surface skin layer side. A laminated sheet used in the glass polishing method according to claim 1,
The urethane sheet comprises at least a urethane sheet and an elastomer sheet, and the urethane sheet has a laminated structure of a surface skin layer and a cell layer, and the glass is pasted on the surface skin layer side. Laminated sheet.