JP2017214239A - Method and apparatus for manufacturing glass plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for manufacturing a glass plate without damaging a glass ribbon by preventing the glass ribbon continuously molded by a down draw method from sticking to a surface plate in the engraving step.SOLUTION: In the method and apparatus for manufacturing a glass plate, capable of including engraving means 3 for forming a marked line 4 in a width direction orthogonal to the flow direction of a glass ribbon 2 continuously molded by a down draw method on the glass ribbon, the engraving means 3 comprises: a surface plate 3a having a contact surface 3a1 contacting one surface side of the glass ribbon 2 in the width direction; an engraving blade 3b for forming the marked line 4 on the other surface side while pressing the glass ribbon 2 on the contact surface 3a1 of the surface plate 3a; and an antistatic member 3c formed on the contact surface 3a1 of the surface plate 3a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of manufacturing a glass plate, and more particularly to a method of manufacturing a glass plate having means for forming engraved lines on a glass ribbon that is continuously formed by a downdraw method and guided downward.

  Conventionally, as a technique for producing a glass plate used as a glass substrate for a flat panel display (hereinafter also simply referred to as FPD) such as a liquid crystal display and a plasma display, for example, a down draw method in which molten glass is drawn downward and formed is known. It has been. Specific examples thereof include an overflow down draw method and a slot down draw method.

  The overflow down-draw method is a technique in which molten glass overflows from both sides of a molded body made of a refractory, joins at the lower end of the molded body, and is drawn downward as a glass ribbon. On the other hand, the slot down draw method is a method in which molten glass is caused to flow out from a slot having a long hole provided at the bottom of the refractory and drawn downward as a glass ribbon. And a glass plate is manufactured by separating the glass ribbon continuously formed in this way into a predetermined size.

  When separating the glass plate from the glass ribbon that is continuously formed and guided downward in this way, for example, by a moving scoring device that synchronizes with the movement of the glass ribbon, A surface plate is brought into contact, and an engraved blade is formed on the other side of the glass ribbon by an engraving blade (hereinafter also referred to as an engraving process), and the separation area of the glass plate partitioned by the engraving is suctioned. The glass plate is separated from the glass ribbon and taken out by applying a bending moment to the glass ribbon and breaking it with engraved lines (for example, see Patent Document 1 below).

JP 2002-137930 A

  By the way, in the above engraving process, the surface plate in contact with the glass ribbon is long in the width direction of the glass ribbon, the contact surface to the glass ribbon is flat, and the material thereof is made of metal. Is customary.

  In the engraving process, as described above, the flat abutment surface of the metal surface plate is brought into contact with one surface of the glass ribbon, and the engraving blade is moved along the corresponding contact surface, so that it abuts on the surface plate. The glass ribbon is stuck to the surface plate due to static electricity, and there is a problem that the glass ribbon may be damaged when the surface plate tries to move away from the glass ribbon. . In addition, the glass ribbon may be damaged due to the contact surface of the metal surface plate being in direct contact with the glass ribbon.

  In view of the above circumstances, in the present invention, the glass ribbon is not damaged by preventing the glass ribbon from sticking to the surface plate in the engraving process for the glass ribbon continuously formed by the downdraw method. This is a technical issue.

  The glass plate manufacturing method of the present invention, which was created to solve the above problems, forms a score line in a width direction perpendicular to the flow direction on a glass ribbon that is continuously formed by a downdraw method and guided downward. In the manufacturing method of the glass plate provided with the engraving means, the engraving means includes a surface plate having an abutting surface that contacts the one surface side of the glass ribbon in the width direction, and an abutting surface of the surface plate And an engraving blade for forming the engraving line on the other surface side while pressing the glass ribbon, and an antistatic member is provided on the contact surface of the surface plate.

  According to the manufacturing method of the present invention, since the antistatic member is provided on the contact surface of the surface plate, when forming engraved lines on the glass ribbon formed by the downdraw method, the electrostatic charging is performed. As a result, it is possible to prevent the glass ribbon from sticking to the surface plate, and it is possible to avoid a situation in which the glass ribbon is damaged when the surface plate is separated from the glass ribbon. Therefore, it is possible to appropriately form engraving lines on the glass ribbon, and it is possible to satisfactorily separate and take out the glass plate from the glass ribbon.

  In the above manufacturing method, it is preferable that the surface plate is a metal plate, the antistatic member is a sheet-like antistatic sheet, and the antistatic sheet is attached to the contact surface of the surface plate.

  In this way, the antistatic performance can be imparted to the surface plate in a simple manner.

  In the above manufacturing method, the antistatic sheet is preferably made of an elastic member.

  In this way, when the surface plate is brought into contact with one surface side of the glass ribbon and the engraved blade is formed on the other surface side of the glass ribbon, an appropriate cushioning property can be imparted. There is no possibility that the glass ribbon is damaged by contact with the surface plate in the setting process, and it is possible to form better engraved lines.

  In said manufacturing method, it is preferable that the thickness of the said antistatic sheet is 0.2 mm-5 mm.

  If it does in this way, in forming a good score line to a glass ribbon, more suitable cushioning properties can be given.

  In said manufacturing method, it is preferable that the width | variety of the flow direction of the said glass ribbon of the said surface plate is 5 mm-30 mm.

  If it does in this way, the width | variety of the surface plate which contacts a glass ribbon can be narrowed as much as possible, and the surface quality of a glass ribbon can be kept favorable.

  In the above manufacturing method, the glass ribbon is further held by a separating unit that applies bending stress to the glass ribbon so as to open the engraving line, and the thickness of the glass ribbon is 0.4 mm or less. It is preferable that the setting means separates the surface plate from the glass ribbon after forming the score lines on the glass ribbon, and the separating means holds the glass ribbon after the surface plate is separated.

  When the thickness of the glass ribbon is as thin as 0.4 mm or less, the engraving blade will form engraving lines so as to stretch the wrinkles generated in the glass ribbon, so the separating means prior to the formation of the engraving lines When the glass ribbon is held, the glass ribbon is easily broken. On the other hand, if the surface plate is separated from the glass ribbon while the separating means is not holding the glass ribbon, the lower end of the glass ribbon becomes free, so that the glass ribbon is stuck on the surface plate due to electrostatic charging. The problem of stickiness becomes more prominent. Therefore, by having an antistatic member on the contact surface of the surface plate as in the above configuration, even if the lower end portion of the glass ribbon is in a free state, the glass ribbon is fixed to the surface plate due to electrostatic charging. Can be prevented from sticking to the glass ribbon, and the lower end of the glass ribbon can be prevented from swinging.

  The glass plate manufacturing apparatus of the present invention, which was created to solve the above problems, forms a score line in the width direction perpendicular to the flow direction on a glass ribbon that is continuously formed by the downdraw method and guided downward. In the glass plate manufacturing apparatus provided with the engraving means, the engraving means includes a surface plate having an abutting surface that contacts the one surface side of the glass ribbon in the width direction, and an abutting surface of the surface plate And an engraving blade for forming the engraving line on the other surface side while pressing the glass ribbon, and an antistatic member is provided on the contact surface of the surface plate.

  According to the said structure, the effect similar to the corresponding structure already described can be enjoyed.

  According to the method for producing a glass plate of the present invention, when forming a score line on a glass ribbon formed by the downdraw method, the glass ribbon is prevented from sticking to the surface plate due to electrostatic charging. And the situation where a glass ribbon breaks can be avoided. Accordingly, it is possible to appropriately form engraving lines on the glass ribbon, and it is possible to favorably separate and take out the glass plate from the glass ribbon.

It is a schematic perspective view of the manufacturing method of the glass plate which concerns on one Embodiment of this invention. It is a schematic perspective view which shows the isolation | separation process of the manufacturing method which concerns on embodiment of FIG. It is a schematic perspective view which shows the isolation | separation process of the manufacturing method which concerns on embodiment of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, a glass plate manufacturing apparatus 1 (hereinafter simply referred to as a manufacturing apparatus 1) according to an embodiment that embodies the manufacturing method of the present invention is disposed on the upper side of the figure and is, for example, an overflow. In order to carry out the down draw method, a molded body overflowing molten glass is provided, and the molten glass flowing down from the molded body becomes a glass ribbon 2 that moves continuously in a substantially vertical downward direction by gradually solidifying. At the same time, on the surface of the glass ribbon 2, the engraving means 3 forms the engraving line 4 at a preset height position. Further, as will be described later, the manufacturing apparatus 1 is disposed below the engraving means 3 and separates a predetermined region from the lower edge of the glass ribbon 2 with the engraving line 4 to separate it as a glass plate 2a. And means 5 (see FIGS. 2 and 3).

  The engraving means 3 is in contact with the back surface of the glass ribbon 2 and is long in the width direction perpendicular to the flow direction of the glass ribbon 2, and while pressing the glass ribbon 2 against the surface plate 3a. An engraving blade 3b is provided on the surface of the glass ribbon 2 for forming the engraving line 4 in the width direction.

  The surface plate 3a is provided with an abutting surface 3a1 that abuts across the width direction on the back surface side (one surface side) of the glass ribbon 2. And the engraving blade 3b forms the score line 4 on the surface side (other surface side), pressing the glass ribbon 2 to the contact surface 3a1.

  Here, in the present embodiment, the contact surface 3a1 of the surface plate 3a has a thickness made of, for example, MC nylon (registered trademark), Palonia (registered trademark) or rubber, which is a sheet-like resin, as the antistatic member 3c. A 1 mm elastic sheet or the like is attached. The elastic sheet is made of an elastically deformable member (elastic member) and has a predetermined hardness.

  The elastic sheet is adhered to the contact surface 3a1 of the surface plate 3a via a double-sided tape. Thereby, in the engraving process in which the surface plate 3a abuts on one side of the glass ribbon 2 and the engraving blade 3b forms the engraving line 4 on the other side of the glass ribbon 2, the surface plate 3a and the glass ribbon 2 Can be prevented from being charged due to static electricity, and when the surface plate 3a is about to be separated from the glass ribbon 2, a smooth separation between the two can be achieved. In the engraving process, when forming the engraving line 4 on the glass ribbon 2 by the engraving blade 3b, an appropriate cushioning property can be imparted, and the glass ribbon 2 may be damaged by contact with the surface plate 3a. Therefore, it is possible to form a better marking 4.

  The thickness of the antistatic member 3c is preferably 0.2 mm to 5 mm, and more preferably 0.5 to 4 mm. Thereby, when forming a favorable score with respect to a glass ribbon, more suitable cushioning properties can be provided.

  The surface plate 3a is preferably a metal plate such as stainless steel. It is conceivable that the surface plate 3a itself is made of an antistatic member itself such as a rod-like rubber. However, if the surface plate 3a itself is formed of rubber or the like, the rigidity is inferior to that of metal, so that the surface plate 3a may be bent due to the pressing when the engraved blade 4b is formed. . Therefore, it is more preferable that the platen 3a is made of a metal plate to ensure rigidity and an antistatic sheet is provided on the contact surface 3a1.

  The width w of the surface plate 3a with respect to the flow direction of the glass ribbon 2 is preferably 5 mm to 30 mm, and more preferably 10 mm to 20 mm. If it does in this way, the width | variety of the surface plate 3a which contacts the glass ribbon 2 can be made as narrow as possible, and the surface quality of the glass ribbon 2 can be kept favorable.

  The thickness of the glass ribbon 2 is preferably 0.5 mm or less, more preferably 0.4 mm or less, and further preferably 0.3 mm or less. Since the influence of sticking of the surface plate 3a is larger as the glass ribbon 2 is thinner, the effect of the antistatic member 3c of the present invention is exhibited as the glass ribbon 2 is thinner.

  The platen 3a and the engraving blade 3b are held so as to be movable up and down, and the lower moving speed is configured to be the same as the lowering speed of the glass ribbon 2, and when both speeds are the same. As described above, the engraving line 4 is formed on the glass ribbon 2. Further, after the engraving work is completed, both of them return while moving up to a preset initial position while being separated from the glass ribbon 2.

  As shown in FIG. 3, the separating means 5 includes a fulcrum member 5a that is in contact with the surface opposite to the surface on which the engraved line 4 of the glass ribbon 2 is formed, and a lower part than the fulcrum member 5a (engraved line 4). And supporting means 5b for supporting the glass ribbon 2 or the glass plate 2a.

  The fulcrum member 5a is replaced with the surface plate 3a after the engraved line 4 is formed on the glass ribbon 2, and the lower end surface 5a1 of the fulcrum member 5a is aligned with the position where the engraved line 4 is formed. It is contacted along the width direction. Further, the supporting means 5b is disposed on one end side and the other end side in the width direction of the glass ribbon 2 or glass plate 2a, and is held in contact with the front and back surfaces of the glass ribbon 2 or glass plate 2a. It is the composition to do.

  When the supporting means 5b separates the glass plate 2a from the glass ribbon 2, the supporting means 5b rotates around the fulcrum member 5a in the direction indicated by the arrow B in FIG. 3 (in a plane perpendicular to the surface of the glass ribbon 2), A folding force is applied to the glass ribbon 2 so as to open the scored line 4 from the surface on which the scored line 4 is formed toward the back side thereof. In addition, the glass plate 2a separated from the glass ribbon 2 is delivered to a transport unit (not shown) that transports the glass plate 2a to a subsequent process while being supported by the support unit 5b.

  The fulcrum member 5a and the support means 5b are held so as to be movable up and down, and the downward moving speed thereof is configured to be the same as the descending speed of the glass ribbon 2, and the above-mentioned speeds are the same when the two speeds are the same. Thus, the glass plate 2a is separated from the glass ribbon 2. Further, after the separation operation is completed (the support means 5b delivers the glass plate 2a to the conveying means), the two return while moving up to a preset initial position while separating from the glass ribbon 2. It is like that.

  In addition, as the support means 5b, what supports the glass ribbon 2 by vacuum-sucking from either the front or back surface of the glass ribbon 2 etc. can be utilized.

  In the manufacturing apparatus 1, it is preferable that the separating means 5 (supporting means 5 b) support the glass ribbon 2 after the engraving means 3 forms the marking lines 4 and then the platen 3 a is separated from the glass ribbon 2. When the thickness of the glass ribbon is as thin as 0.4 mm or less, the engraving blade 3b forms the engraving line 4 so as to stretch the wrinkles generated in the glass ribbon 2. If the separating means 5 supports the glass ribbon 2 prior to the formation of the engraving lines 4, the wrinkles are difficult to stretch and the glass ribbon 2 is likely to be damaged. On the other hand, if the surface plate 3a is separated from the glass ribbon 2 in a state where the separating means 5 does not support the glass ribbon 2, the lower end portion of the glass ribbon 2 becomes free, so that the surface plate 3a caused by electrostatic charging. The problem of sticking to the glass ribbon 2 becomes more prominent. Therefore, since the antistatic member 3c is provided on the abutting surface 3a1 of the surface plate 3a as in the above configuration, the glass ribbon 2 is caused by electrostatic charging even if the lower end of the glass ribbon 2 is free. 2 can be prevented from sticking to the surface plate 3a, and the lower end of the glass ribbon 2 can be prevented from swinging.

  As described above, according to the manufacturing apparatus 1 according to this embodiment, since the antistatic member 3c is provided on the contact surface 3a1 of the surface plate 3a, the glass ribbon 2 formed by the downdraw method is used. When forming the engraving line 4, it is possible to prevent the glass ribbon 2 from sticking to the surface plate 3 a due to electrostatic charging, and the glass ribbon 2 is damaged when the surface plate 3 a is separated from the glass ribbon 2. Can be avoided. Therefore, the engraving line 4 can be appropriately formed on the glass ribbon 2, and the glass plate 2 a can be satisfactorily separated and taken out from the glass ribbon 2.

  In the present embodiment, as shown in FIG. 1 and the like, the engraving blade 3b makes the engraving line 4 in a state where the platen glass ribbon 2 is in contact with the surface plate 3a having the flat contact surface 3a1. However, the present invention is not limited to such engraving means. For example, in a state where a surface plate having a contact surface formed on a curved surface (for example, a convex curved surface) corresponding to this curve is in contact with a glass ribbon that is curved in the width direction, the curved ribbon is used to follow the curve. The engraving line 4 may be formed.

  In the present embodiment, the case where the surface plate 3a and the fulcrum member 5a are separate members has been described. However, the fulcrum member 5a may be omitted, and the surface plate 3a may also serve as the fulcrum member 5a. . That is, after the engraving operation is completed, the lower end surface of the surface plate 3a may be aligned with the position where the engraving line 4 is formed, and positioning may be performed again.

  The apparatus for producing a glass plate according to the present invention can be used, for example, when producing a glass plate used as a glass substrate for a flat panel display such as a liquid crystal display or a plasma display.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Glass ribbon 3 Engraving means 3a Surface plate 3a1 Contact surface 3b Engraving blade 3c Antistatic member 4 Engraving

Claims (7)

In a glass ribbon manufacturing method comprising a marking means for forming a score line in a width direction perpendicular to the flow direction on a glass ribbon continuously formed by a downdraw method and guided downward,
The engraving means is
A surface plate having a contact surface that contacts the one surface side of the glass ribbon across the width direction;
An engraving blade that forms the engraved line on the other surface side while pressing the glass ribbon against the contact surface of the surface plate,
An antistatic member is provided on the contact surface of the surface plate,
The manufacturing method of the glass plate characterized by the above-mentioned. The surface plate is a metal plate,
The antistatic member is a sheet-like antistatic sheet,
The antistatic sheet is affixed to the contact surface of the surface plate,
The manufacturing method of the glass plate of Claim 1 characterized by the above-mentioned. The antistatic sheet is made of an elastic member.
The manufacturing method of the glass plate of Claim 2 characterized by the above-mentioned. The antistatic sheet has a thickness of 0.2 mm to 5 mm.
The manufacturing method of the glass plate of Claim 2 or 3 characterized by the above-mentioned. The width of the glass ribbon in the flow direction of the surface plate is 5 mm to 30 mm.
The manufacturing method of the glass plate in any one of Claims 2-4 characterized by the above-mentioned. Separating means for supporting the glass ribbon and applying bending stress to the glass ribbon so as to open the engraving line,
The glass ribbon has a thickness of 0.4 mm or less,
The engraving means separates the surface plate from the glass ribbon after forming the engraving line on the glass ribbon,
The separating means supports the glass ribbon after the surface plate is separated.
The manufacturing method of the glass plate in any one of Claims 1-5 characterized by the above-mentioned. In the glass plate manufacturing apparatus provided with the engraving means for forming engraved lines in the width direction perpendicular to the flow direction on the glass ribbon continuously formed by the down draw method and guided downward,
The engraving means is
A surface plate having a contact surface that contacts the one surface side of the glass ribbon across the width direction;
An engraving blade that forms the engraved line on the other surface side while pressing the glass ribbon against the contact surface of the surface plate,
An antistatic member is provided on the contact surface of the surface plate,
An apparatus for producing a glass plate.

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