KR-102965328-B1 - Method for manufacturing glass film

KR102965328B1KR 102965328 B1KR102965328 B1KR 102965328B1KR-102965328-B1

Abstract

A method for manufacturing a glass film is provided that can precisely cut a mother glass film along a planned cutting line without causing scratches on the upper surface of the glass film while preventing a decrease in workability. The method for manufacturing a glass film (G) involves applying bending stress to the planned cutting line (L1) of the mother glass film (MG) and forming an initial crack (D) in a part of the planned cutting line (L1) to advance the initial crack (D) along the planned cutting line (L1) to cut the mother glass film (MG). The mother glass film is placed on a plate (2) that generates negative pressure suction force on the upper surface (2a) so that a protrusion (B), which is a protruding part of the end (A) of the mother glass film (MG), is formed, and the planned cutting line (L1) is formed on the protrusion (B).

Inventors

야마시로 리쿠
츠지무라 후미히토
모리 히로키

Assignees

니폰 덴키 가라스 가부시키가이샤

Dates

Publication Date: 20260513
Application Date: 20211227
Priority Date: 20210112

Claims (10)

A method for manufacturing a glass film, wherein a bending stress is applied to a mother glass film at a planned cutting line, and an initial crack is formed in a part of the planned cutting line, thereby advancing the initial crack along the planned cutting line to cut the mother glass film. A mother glass film is placed on a fixed plate that generates negative pressure suction force on the upper side, such that a protrusion is formed at the end of the mother glass film, which is a portion protruding from the fixed plate, and the planned cutting line is formed on the protrusion. By bending the protrusion to follow a holding member positioned to contact the lower surface of the protrusion at a position lower than the upper surface of the above platen, bending stress is applied to the planned cutting line. A method for manufacturing a glass film characterized by the following.
In paragraph 1, A crack-forming member forms the initial crack on a part of the planned cutting line, and The above initial crack is formed at the end of the above planned cutting line. A method for manufacturing a glass film characterized by the following.
In paragraph 2, The mother glass film is bent by the above bending stress, and Advancing the initial crack by applying pressure of the crack-forming member to the concave side of the bendable mother glass film. A method for manufacturing a glass film characterized by the following.
In paragraph 2 or 3, The above crack-forming member is guided to the position where the initial crack is formed by a guide member installed at one end of the above retaining member. A method for manufacturing a glass film characterized by the following.
In paragraph 1 or 2, A retaining member is disposed on the concave side of the protrusion that is bent by the above bending stress, and The above-mentioned vaginal member has a curved outer surface, The above-mentioned retaining member is positioned to follow the outer surface with respect to the protrusion of the mother glass film. A method for manufacturing a glass film characterized by the following.
In paragraph 2 or 3, A slit is formed at the end of the above-mentioned female member into which the crack-forming member is inserted. A method for manufacturing a glass film characterized by the following.
In paragraph 1 or 2, A position determining member is installed on the above-mentioned surface plate, and The position of the mother glass film on the surface is determined such that the end of the mother glass film protrudes from the end of the holding member by the mother glass film contacting the positioning member. A method for manufacturing a glass film characterized by the following.
In paragraph 1 or 2, A cutting guide line serving as an indicator of the planned cutting line is marked on the above-mentioned buttock member. A method for manufacturing a glass film characterized by the following.
In paragraph 1 or 2, On both sides of the above-mentioned plate, the above-mentioned support member is positioned. A method for manufacturing a glass film characterized by the following.
In paragraph 1 or 2, A replaceable protective sheet is installed on the above-mentioned surface plate, and Placing the mother glass film on the protective sheet A method for manufacturing a glass film characterized by the following.

Description

Method for manufacturing glass film [0001] The present invention relates to a method for manufacturing a glass film. [0002] Recently, flat panel displays such as liquid crystal displays, plasma displays, organic EL displays, and field emission displays are being used as image display devices, such as television receivers, instead of the conventionally used CRT displays. In the case of the glass used in these flat panel displays, thinning is being promoted. [0003] Patent Document 1 discloses a glass film (thin sheet glass) with a thickness of several hundred μm or less. As described in Patent Document 1, a method for manufacturing a glass film includes a method of cutting the glass film (mother glass film) by applying tensile stress (bending stress) to the planned cutting line and forming an initial crack in a part of the planned cutting line, thereby advancing the initial crack along the planned cutting line. [0004] For example, the glass film described in Patent Document 1 is cut by a glass film cutting device equipped with a conveying roller for conveying the glass film. When cutting the glass film, the glass film cutting device is configured so that the end of the glass film sags due to its own weight. Accordingly, tensile stress is applied to the line of the intended cut, so that if an initial crack is formed in a part of the line of the intended cut, the initial crack advances along the line of the intended cut, thereby allowing the glass film to be cut. In this glass film cutting device, a holding member for maintaining the position of the glass film is not installed, but another glass film cutting device is disclosed in Patent Document 1 that is equipped with a pressing member for pressing the glass film from above. [0030] Fig. 1 is a perspective view of a plate with a mother glass film installed. FIG. 2 is a perspective view of a glass film cutting device for explaining a method for manufacturing a glass film according to a first embodiment of the present invention. FIG. 3 is a schematic diagram illustrating the placement of a glass film on a platen, wherein (a) is a schematic plan view, (b) is a schematic side view, and (c) is a schematic front view. FIG. 4 is a schematic diagram for explaining downward pressure of a protrusion, wherein (a) is a schematic plan view, (b) is a schematic side view, and (c) is a schematic front view. FIG. 5 is a schematic diagram illustrating the formation of an initial crack, wherein (a) is a schematic plan view, (b) is a schematic side view, and (c) is a schematic front view. Figure 6 is a schematic plan view illustrating the progression of an initial crack. FIG. 7 is a perspective view of a glass film cutting device for explaining a method for manufacturing a glass film according to a second embodiment of the present invention. FIG. 8 is a schematic diagram illustrating the formation of an initial crack, wherein (a) is a schematic plan view, (b) is a schematic side view, and (c) is a schematic front view. [0031] Hereinafter, a first embodiment of the present invention will be described based on the attached drawings. [0032] In the method for manufacturing a glass film (G), a mother glass film (MG) is cut using a glass film cutting device (1). The thickness of the mother glass film (MG) (glass film (G)) is preferably 10㎛ to 200㎛. [0033] Using FIGS. 1, FIGS. 2 and FIGS. 5, the configuration of a glass film cutting device (1) is described. The glass film cutting device (1) mainly comprises a flat plate (2), a crack forming member (3), a guide member (4), a holding member (5), and a positioning member (6). In addition, in this embodiment, the mother glass film (MG) to be cut is in a rectangular shape. [0034] As shown in FIGS. 1 and 2, the plate (2) is on which a mother glass film (MG) is placed. The plate (2) has, for example, a rectangular shape on its upper surface (2a), and a plurality of suction holes (2b) are formed on the upper surface (2a). Each suction hole (2b) is connected to a negative pressure device (not shown), and the inside of the suction holes (2b) is maintained under negative pressure by the negative pressure device. Therefore, the mother glass film (MG) placed on the upper surface (2a) of the plate (2) is held in place on the plate (2) by the negative pressure suction force generated in the suction holes (2b). If the upper surface (2a) of the plate (2) is formed of a porous body, the suction holes (2b) do not need to be formed. Additionally, a mother glass film (MG) is placed on the plate (2) such that a protrusion (B) is formed, which is a portion of the end (A) of the mother glass film (MG) protruding from the plate (2). [0035] As shown in FIG. 5, the crack forming member (3) forms an initial crack (D) on a part of the planned cutting line (L1) of the mother glass film (MG). The crack forming member (3) forms an initial crack (D) at, for example, the end (E) of the planned cutting line (L1). The crack forming member (3) is, for example, a rod-shaped