TW202239724A - Method for producing glass film - Google Patents

Abstract

This method for producing a glass film G comprises a preparation step S1 for preparing a mother glass film MG, a cutting step S2 for applying bending stress along a planned cutting line C2 on the mother glass film MG to cut the mother glass film MG and obtain a glass film G, and an evaluation step S3 for superimposing the glass film G on a standard plate SP having a size that serves as a standard and evaluating the size of the glass film G.

Description

Manufacturing method of glass film

The invention relates to a method for manufacturing a glass film.

The glass film is a thin plate glass having a thickness of, for example, 300 μm or less, and it is customary to cut the mother glass film into a predetermined size corresponding to the glass film in order to obtain the glass film from a mother glass film of a large plate in the manufacturing process. step.

In such a cutting step, laser cutting is used (for example, refer to Patent Document 1). In laser cutting, first, an initial crack is formed at one end of a line to cut (a virtual line) of the mother glass film. Next, the heated area heated by the laser and the accompanying cooled area cooled by the refrigerant are sequentially scanned from one end to the other end of the planned cutting line of the glass film. Thereby, the initial crack develops along the line to cut due to the thermal stress generated by the temperature difference between the heated region and the cooled region, and the mother glass film is cut (full-body cut). [Prior art literature] [Patent Document]

Patent Document 1: Japanese Patent Laid-Open No. 2011-57494

[Problem to be Solved by the Invention]

In the case of cutting the mother glass film by laser cutting, the dimensional accuracy after cutting is good, but on the other hand, it takes time to cut, and a large number of people are required to adjust cutting conditions such as laser or refrigerant. Therefore, there is a problem that the production cost of the glass film becomes high.

The object of the present invention is to reduce the production cost of the glass film. [Means to solve the problem]

(1) The method of manufacturing a glass film according to the present invention, which was invented in order to solve the above-mentioned problems, is characterized by including: a preparation step of preparing a mother glass film; A cutting step of obtaining a glass film from a mother glass film; and an evaluation step of evaluating the size of the glass film by superimposing the glass film on a reference plate having a standard size.

In this way, in the cutting step, the mother glass film is cut due to the bending stress, so that cutting time can be shortened compared with laser cutting. In addition, in the cutting step, since adjustments such as laser light are not required, cutting can be performed with a small number of people. On the other hand, in the case of cutting while applying a bending stress, the dimensional accuracy after cutting tends to deteriorate compared with laser cutting. Therefore, in the invention of this application, in the evaluation step, the glass film is overlaid on the reference plate, and the size of the glass film is evaluated. According to the evaluation method using such a reference plate, the size of the glass film can be efficiently evaluated in a short time. Therefore, even if the glass film includes a defective product whose size is evaluated as unacceptable in the evaluation step, the manufacturing time and personnel can be greatly reduced. In comparison, it can be reduced in cost.

(2) In the configuration of (1) above, in the preparatory step, the glass ribbon may be cut by applying bending stress along the planned cutting line of the glass ribbon unwound from the glass roll to obtain a mother glass film.

If so, the mother glass film can be obtained efficiently from the glass roll which wound the glass ribbon.

(3) In the structure of (2), preferably, in the preparatory step, the glass ribbon cutting device is used to cut the glass ribbon, and the glass ribbon cutting device includes: The unwound glass ribbon is guided along the first transfer surface inclined upward toward the downstream side; the second transfer section is on the downstream side of the first transfer section, and guides the glass ribbon along the second transfer surface inclined downward toward the downstream side. and a bending stress imparting section that supports the glass ribbon from below at the top between the first transfer section and the second transfer section, and applies bending stress along the planned cutting line of the glass ribbon.

If so, mutually opposite tension acts on a glass ribbon centering on a planned cutting line, following the inclination of a 1st transfer surface and a 2nd transfer surface. Since the tension acts to spread the line to cut to both sides, cutting along the line to cut is promoted together with the bending stress applied by the bending stress imparting portion. Therefore, the glass ribbon can be efficiently cut.

(4) In the structure of said (3), it is preferable to change the kind of the bending stress applying part of a glass ribbon cutting device according to the thickness of a glass ribbon.

If so, optimal bending stress can be given to a glass ribbon according to the thickness of a glass ribbon.

(5) In the structure of any one of (1) to (4), preferably in the cutting step, a mother glass film cutting device is used to cut the mother glass film, and the mother glass film is cut The device includes: a mounting table, on which the mother glass film is placed; a positioning part, which positions the mother glass film relative to the mounting table; a pair of pressing members, pushes both sides of the planned cutting line of the mother glass film to the side of the mounting table; and The bending stress applying unit presses the mother glass film in a direction away from the mounting table between the pair of pressing members, and applies bending stress along the line to cut the mother glass film.

In this way, the mother glass film is placed on the mounting table in a state where it is positioned by the positioning unit. In addition, since the mother glass film placed on the mounting table is pressed by the pair of pressing members on both sides of the planned cutting line, it is pressed in a direction (upward or downward) away from the mounting table by the bending stress imparting portion, so it can be moved along the Bending stress is reliably applied along the line to be cut. Therefore, the mother glass film can be cut efficiently.

(6) In the configuration of (5) above, it is preferable to change the type of the bending stress imparting portion of the mother glass film cutting device according to the thickness of the mother glass film.

In this way, optimal bending stress can be applied to the mother glass film according to the thickness of the mother glass film.

(7) In the structure of (5) or (6), it is preferable to change the position of the pressing member of the mother glass film cutting device relative to the mounting table according to the thickness of the mother glass film so as to change the distance from the mother glass film. Cut off the distance of the intended line.

In this way, the magnitude of the bending stress applied along the line to cut can be easily and reliably adjusted.

(8) In the configuration of any one of (1) to (7) above, it is preferable that the reference plate has a colored marking portion on at least a part of the contour portion of the main surface of the reference plate.

In this way, since the position of the end surface of the glass film can be easily grasped by the colored marking portion, the size of the glass film can be accurately evaluated. Therefore, this structure is particularly effective when the reference plate comprises a transparent material.

(9) In the structure of any one of (1) to (8), it is preferable that the reference plate has a glass plate as a base material.

This makes it difficult to cause dimensional changes, warping, and the like of the reference plate, so that the size of the glass film can be accurately evaluated. In particular, it is preferable that the reference plate is made of the same mother glass film as the glass film in terms of easy availability and the like.

(10) In the structure of any one of the above (1) to (9), it is preferable that the reference plate has a buffer layer on the contact surface side with the glass film.

In this way, the glass film superimposed on the reference plate is less likely to be damaged.

(11) In the structure of any one of said (1)-(10), it is preferable to perform a touch inspection on the end surface of the laminated body which laminated|stacked the glass film on the reference board in the evaluation process. Here, the touch inspection is performed, for example, by an operator's finger.

If so, the size of the glass film can be evaluated simply and quickly.

(12) In the structure of any one of (1) to (11), it is preferable that the reference plate and the glass film are each in a rectangular shape, and in the evaluation step, the glass film is stacked on the reference plate. Two sides intersecting at one corner among the four sides of the laminate were positioned by bringing the reference plate and the glass film into contact with the positioning part, and the size of the glass film was evaluated on the remaining two sides of the laminate.

In this way, on both sides of the laminate, the reference plate and the glass film are positioned by being in contact with the positioning portion. That is, on both sides of the laminated body, the positions of the end faces of the reference plate and the end faces of the glass film were aligned. On the other hand, on the remaining two sides of the laminate, when the size of the reference body and the glass film are different, the positions of the end surface of the reference plate and the end surface of the glass film are different. Therefore, the size of the glass film can be evaluated only on the remaining two sides of the laminate. That is, since all four sides of the laminate do not need to be evaluated, the size of the glass film can be quickly evaluated.

(13) In the structure of any one of the above (1) to (12), preferably in the evaluation step, when the glass film is larger than the reference plate, when the projecting dimension of the glass film relative to the reference plate is When it is below the first acceptable threshold value, the glass film is regarded as a good product. The film is considered good and the first pass threshold is less than the second pass threshold.

In this way, since the first pass threshold value becomes a stricter standard than the second pass threshold value, the probability that a glass film larger than the reference plate is regarded as a good product can be reduced. Therefore, when arranging and using a glass film regarded as a good product inside the frame portion corresponding to the size of the reference plate, the glass film can be easily arranged.

(14) In the structure of any one of the above (1) to (13), it is preferable to place the glass film deemed good in the evaluation step on the film-forming jig corresponding to the size of the reference plate. The inside of the frame.

In this way, since the glass film can be reliably arranged inside the frame portion of the film-forming jig, it is possible to accurately form a film on the glass film. [Effect of the invention]

According to the present invention, it is possible to reduce the production cost of the glass film.

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

As shown in FIG. 1 , the manufacturing method of the glass film according to this embodiment includes a preparation step S1 , a cutting step S2 , and an evaluation step S3 . The preparation step S1, the cutting step S2, and the evaluation step S3 are preferably performed in a processing room (for example, a clean room) in which temperature and humidity are managed.

(preparation steps) As shown in FIGS. 2 to 6 , the preparation step S1 is a step of preparing the mother glass film MG, and in this embodiment, the glass ribbon cutting device 1 is used.

As shown in FIG. 2 , the glass ribbon cutting device 1 includes a glass roll 2 and a cutting unit 3 that cuts only the glass ribbon GR out of the glass ribbon GR unwound from the glass roll 2 and the protective tape PR. The glass roll 2 is mounted on a movable cart 2v on casters (not shown), and the cutting unit 3 is mounted on a movable base 3v on casters (not shown). In addition, in the same figure, for convenience, the glass ribbon GR is drawn by the solid line, and the protective belt PR is drawn by the dashed-dotted line.

Here, in the glass ribbon GR, the thickness is 300 μm or less, 200 μm or less, or 100 μm or less, and the width dimension is 100 mm to 2000 mm or 500 mm to 1000 mm. In addition, protective tape PR contains resin or foamed resin, has a thickness of 200 μm or less, and has both ends in the width direction protruding from both ends in the width direction of glass ribbon GR.

The cutting part 3 has a cylindrical or cylindrical breaking bar 4 as a bending stress imparting part. The breaking rod 4 is fixedly installed on the upper end of the support member 3x fixed to the base 3v using the frame member 3w. In this case, the cutting rod 4 is arrange|positioned at the position higher than the unwinding start part 2z of the glass ribbon GR and the protective tape PR in the glass roll 2. As shown in FIG. In detail, the unwinding start part 2z of the glass roll 2 is located in the lower end part of the glass roll 2. As shown in FIG. Moreover, the glass roll 2 is unwound in the state in which the protective tape PR was wound around the outer peripheral side of the glass ribbon GR, and the glass ribbon GR overlapped on the protective tape PR. Moreover, the cutting rod 4 is arrange|positioned at the position higher than the unwinding start part 2z of the glass roll 2 (strictly speaking, the unwinding start part 2z when the glass roll 2 becomes the smallest diameter). The two belts GR and PR are stretched from the unwinding start part 2z of the glass roll 2 to the folding and cutting rod 4 .

Furthermore, the cutting part 3 has: the first workbench 5 as the first transfer part is arranged behind the broken rod 4; and the second workbench 6 as the second transfer part is arranged in front of the cut rod 4 . In addition, in the following description, "rear side" means the upstream side of the conveyance direction of the glass ribbon GR unwound, and is the left side in a paper surface. In addition, "the front" means the downstream side of the conveyance direction of the unwound glass ribbon GR, and is the right side in a paper surface.

As shown in FIGS. 3 and 4 , the first workbench 5 is tilted upward and upward, and the second workbench 6 is tilted downward and downward. In the illustration, the first workbench 5 and the second workbench 6 are slightly away from the folding and cutting rod 4 , but they can also be in contact with the folding and cutting rod 4 . In addition, the first workbench 5 is fixedly installed. In contrast, the second workbench 6 can rotate from the fixed position shown by the solid line in FIG. s position.

The glass ribbon GR is unwound from the glass roll 2 in the state piled up on the protective tape PR. The unwound two tapes GR, PR (including the mother glass film MG obtained by cutting to be described later) run along the first transfer surface 5a that is the upper surface of the first workbench 5, and the second workbench as the second workbench. The second transfer surface 6a of the upper surface of 6 is transferred. Furthermore, the so-called "along the first transfer surface 5a and the second transfer surface 6a" is not limited to the situation along the entire area of the first transfer surface 5a and the second transfer surface 6a, but also includes 5a, the case of a part of the second transfer surface 6a. FIG. 3 exemplifies the state before the glass ribbon GR is cut (the same is true for FIG. 2 ). In the illustration, the two ribbons GR and PR are only along the front side region of the first transfer surface 5 a. Moreover, about the 2nd transfer surface 6a, the protective tape PR is along the whole area|region of a transfer direction, and glass ribbon GR is along only a rear side area|region. In addition, although not shown in figure, the mother glass film MG obtained by cutting (it will mention later in detail) is along the front side area|region of the 2nd transfer surface 6a. In the description of this embodiment, the case where the protective tape PR follows the first transfer surface 5a and the second transfer surface 6a has the same meaning as the case where the protective tape PR contacts the first transfer surface 5a and the second transfer surface 6a.

As shown in FIG. 3, the 1st transfer surface 5a is the surface which becomes the upward slope toward the front, and the 2nd transfer surface 6a is the surface which becomes the downward slope toward the front. For example, the inclination angle α1 of the first transfer surface 5 a with respect to the horizontal plane is 20° to 60°, and the inclination angle α2 of the second transfer surface 6 a with respect to the horizontal plane is 20° to 60°. The second table 6 is held on the base 3v so that the inclination angle α2 of the second transfer surface 6a can be set to an arbitrary angle within the angle range. In this embodiment, the first table 5 is fixedly installed on the base 3v, but it may be held on the base in such a manner that the inclination angle α1 of the first transfer surface 5a can be set to any angle within the angle range. 3v on. And the angle β which the 1st transfer surface 5a and the 2nd transfer surface 6a form is 60 degrees - 120 degrees.

Cutting of the glass ribbon GR is carried out in the state in which the transfer of both ribbons GR and PR is stopped. Here, the 1st transfer surface 5a functions also as a receiving surface which catches and supports the cut|disconnected glass ribbon GR mentioned later. The 2nd transfer surface 6a also plays the role which follows and holds both belts GR, PR when the transfer of both belts GR, PR stops. Furthermore, the 2nd transfer surface 6a also plays the role of transferring the cut|disconnected mother glass film MG mentioned later. Both the upper end 5x of the first transfer surface 5a and the upper end 6x of the second transfer surface 6a are lower than the upper end of the cutting rod 4 and higher than the unwinding start portion 2z of the glass roll 2 .

In this embodiment, the two tapes GR, PR are unwound from the glass roll 2 by pulling the protective tape PR at a position closer to the front side than the cutting rod 4 . Therefore, tension is applied to the protective tape PR when both the tapes GR and PR are transferred. At this time, no tension is given to the glass ribbon GR. In addition, when the transfer of the two tapes GR and PR is stopped, by holding the protective tape PR at a fixed position on the second transfer surface 6a, the protective tape PR that exists on the rear side of the folding rod 4 is It provides the tension|tensile_strength for bearing the sagging of the glass ribbon GR. At this time, tension is not given to the glass ribbon GR, either.

Furthermore, as shown in FIG. 2, the cutting part 3 is provided with the sheet roll 7 for winding up the protective tape PR which passed the 2nd conveyance surface 6a.

Next, a method of obtaining the mother glass film MG using the glass ribbon cutting device 1 described above will be described.

In the process of unwinding the glass ribbon GR and the protective tape PR from the glass roll 2, the two ribbons GR and PR are conveyed along the 1st conveyance surface 5a, and the front end GRa of the glass ribbon GR passes the cutting rod 4 by this. Thereafter, the two belts GR, PR are transferred along the second transfer surface 6a. As shown in FIG. Transfer of PR stopped. In this embodiment, the transfer of the two tapes GR and PR is performed by an operator pulling the protective tape PR at a position on the front side from the above-mentioned cutting rod 4 . Specifically, as shown in the example, an operator makes the glass ribbon GR arrive at the position which passed the said predetermined length L1 by pulling the protective tape PR along the 2nd transfer surface 6a. In addition, the said predetermined length L1 can be visually recognized by an operator by the mark (illustration omitted) attached to the 2nd transfer surface 6a. Therefore, an operator performs the operation|work for positioning the front-end|tip GRa of the glass ribbon GR to the said mark, and when positioning is completed, the operation which pulls the protective tape PR is stopped. Thereby, the transfer of the two belts GR and PR is stopped. In addition, the operator may pull the protective tape PR and separate it from the 2nd transfer surface 6a, but when performing the operation|work for said positioning, it is necessary to pull along the 2nd transfer surface 6a. Here, when the mother glass film MG of the same length is repeatedly cut out from the glass ribbon GR, it is only necessary to put the said mark on one place of the 2nd transfer surface 6a. However, when there are multiple types of lengths of the mother glass film MG cut out from the glass ribbon GR, the above-mentioned marks are written on a plurality of locations in the transfer direction in the second transfer surface 6a.

In this way, sufficient bending stress is given to the glass ribbon GR by the cutting rod 4 when the transfer of both ribbons GR and PR stops. Furthermore, at this point in time, in order to surely give sufficient bending stress to the glass ribbon GR, it is also possible to push the two ribbons GR and PR toward the first transfer surface 5 a and the second transfer surface 6 a around the splitting bar 4 . Press and other operations. In this state, from the top of the folding rod 4 (preferably above the central axis of the folding rod 4) to the planned cutting line (imaginary line) extending in the width direction of the glass ribbon GR One end portion of C1 (the side edge portion of the glass ribbon GR indicated by the arrow A in FIG. 5 ) is damaged (initial crack) using a damage applying member. In this embodiment, the work of applying damage is also performed by the operator. As a result, the damage progresses linearly along the line to cut C1 to the other end of the line to cut C1 . That is, the damage applied to one part of the one end portion of the line C1 to cut progresses over the total length in the width direction and the total length in the thickness direction of the glass ribbon GR by the action of the bending stress. As a result, the folding (cutting) of the glass ribbon GR is completed. As shown in FIG. 6 , the rectangular mother glass film MG obtained by this cutting is transferred on the second transfer surface 6 a following the protective tape PR. Thereafter, if the second stage 6 is set to the posture shown by the dashed-dotted line in FIG. 3 , for example, the mother glass film MG can be easily loaded in the vertical posture on, for example, a binding tray or the like. Furthermore, as shown in FIG. 5 , in this embodiment, the planned cutting line C2 (longitudinal direction of the mother glass film MG) of the mother glass film MG in the cutting step S2 described later is the same as the glass ribbon GR in the preparation step S1. The planned cutting line C1 (the width direction of the glass ribbon GR) is perpendicular to each other.

As shown in FIG. 7, the kind of breaking rod can be changed according to the thickness of the glass ribbon GR. In this embodiment, if the above-mentioned breaking rod 4 is referred to as a first breaking rod, when the thickness of the glass ribbon GR is, for example, 50 μm or less, it will have a curvature smaller than that of the first cutting rod 4 . The cylindrical or cylindrical second breaking rod 8 is arranged on the first cutting rod 4 in parallel. The radius of curvature of the first cutting rod 4 is, for example, 30 mm to 70 mm, and the radius of curvature of the second cutting rod 8 is, for example, 10 mm to 40 mm. And the glass ribbon GR and protective tape PR unwound from the glass roll 2 are arrange|positioned on this 2nd folding rod 8. As shown in FIG. Thereby, in preparatory process S1, the kind of bending stress provision part can be changed according to the thickness of glass ribbon GR. That is, when the thickness of the glass ribbon GR is thin, the glass ribbon GR can be bent more steeply than when the thickness of the glass ribbon GR is thick, so that an appropriate bending stress can be applied regardless of the thickness of the glass ribbon GR. . Furthermore, in the present embodiment, since the second breaking rod 8 is arranged on the first breaking rod 4, when changing from the first breaking rod 4 to the second breaking rod 8, the bending stress The level difference between the provision part and the glass roll 2 also becomes large. There may be three or more kinds of changeable cutting sticks.

The glass ribbon cutting device 1 includes a length adjustment mechanism 9 as shown in FIG. 8 in addition to the above-mentioned structure.

The length adjustment mechanism 9 is a mechanism which adjusts the unwinding length of the glass ribbon GR on the 2nd transfer surface 6a of the 2nd table 6, when unwinding the protective tape PR and the glass ribbon GR from the glass roll 2. Specifically, the length adjustment mechanism 9 operates to correctly position the front end GRa of the glass ribbon GR to the mark marked on the second transfer surface 6a when the front end GRa of the glass ribbon GR passes through the cutting rod 4. A mechanism for fine-tuning the unwinding length.

Specifically, the length adjustment mechanism 9 includes: a large-diameter gear 10 disposed coaxially with the winding shaft 2a of the glass roll 2; a small-diameter gear 11 meshing with the large-diameter gear 10; and a worm wheel 12 capable of It is arranged coaxially with the small-diameter gear 11 so as to rotate integrally; and the worm 13 meshes with the worm wheel 12 . The small-diameter gear 11, the worm wheel 12, and the worm 13 are held on an elevating table 15 that can be moved up and down by a fluid pressure cylinder 14 such as an air cylinder. An actuating shaft 17 extending toward the front side and having a handle 16 at the front end is mounted on the worm 13 . The rear end portion of the operating shaft 17 is rotatably supported by the shaft support portion 15a of the elevating table 15, and the front end portion of the operating shaft 17 is rotatably supported by a plurality of (two in the illustration) shafts fixedly provided on the base 3v. Support wall material 18 . The actuation shaft 17 is connected between the shaft support portion 15 a and the shaft support wall material 18 by a plurality of (two in the illustration) universal joints 19 . The handle 16 is disposed under the second workbench 6 . A switch 20 for issuing a signal for raising and lowering the elevating table 15 is attached to a peripheral portion of the handle 16 (in the illustration, the front side shaft supporting wall material 18 ).

This length adjustment mechanism 9 is operated by an operator as follows. First, an operator makes front-end|tip GRa of glass ribbon GR exist in the vicinity of a mark by pulling protective tape PR along 2nd transfer surface 6a. In this state, the operator operates the switch 20 to move the elevating table 15 upward to the ascending end position shown in the figure. At this point of time, when there is a gap of a predetermined length from the front end GRa of the glass ribbon GR to the mark, the operator rotates the handle 16 forward. Thereby, the glass roll 2 rotates to the arrow W1 direction, and the two tapes GR, PR are unwound. On the contrary, when the front-end|tip GRa of the glass ribbon GR passed a mark and passed predetermined length, an operator reverses the handle 16. As shown in FIG. Thereby, the glass roll 2 rotates in the direction of arrow W2, and winds up two tapes GR and PR. Tension is applied to the protective tape PR while the operator operates the handle 16 in this way. In this case, an operator performs the operation|work for positioning the front-end|tip GRa of the glass ribbon GR to a mark by performing normal rotation or reverse rotation of the handle 16 only once, or by repeating normal rotation and reverse rotation. When this positioning is completed, the operator stops the operation of the handle 16 . In this state, glass ribbon GR is cut|disconnected as mentioned above, and an operator operates the switch 20, and lowers the elevating table 15 from the state shown in figure. Thereby, the meshing of the large-diameter gear 10 and the small-diameter gear 11 is released, and power is not transmitted from the handle 16 to the large-diameter gear 10 and even the glass roll 2 . In addition, the cutting|disconnection of the glass ribbon GR, and the descending order of the elevating platform 15 may be reversed to the said case. Thereafter, the operator pulls the protective tape PR again, and performs the same operation as the above case.

The cutting device 1 is not limited to the above embodiment, and various changes are possible.

In the above-described embodiment, the breaking rod 4 as the bending stress imparting part is set to be cylindrical or columnar, but it may also be an ellipse or other curved shape in cross section, and furthermore, only the upper part may be in the shape of a cylinder. Such a curved shape may also be a shape that does not have a curved shape. Furthermore, the number of objects of the breaking rod 4 is not limited to one, and it may consist of several. In addition, the bending stress imparting part may have the structure which does not have a split rod, and what is necessary is just to apply the bending stress necessary for cutting the glass ribbon GR in any case.

In the said embodiment, although the damage was given to the glass ribbon GR above the breaking rod 4, you may make it damage to the glass ribbon GR behind the cutting rod 4, ie, before cutting|disconnecting. Furthermore, in addition to giving damage, you may give a scribe line (scribe line), It is preferable to give a scribe line to glass ribbon GR before cutting.

In the above-described embodiment, the first transfer surface 5a and the second transfer surface 6a are set as the upper surfaces of the first workbench 5 and the second workbench 6, but these transfer surfaces 5a and 6a can also be working The upper surface of a table, etc. other than a table. Moreover, the 1st transfer surface 5a and the 2nd transfer surface 6a may be the surface which does not have a slope either or both. Furthermore, the 1st transfer surface 5a and the 2nd transfer surface 6a may be conveyance surfaces, such as a conveyor. In this case, the worker does not need to pull the protective tape PR.

In the above-described embodiment, the glass ribbon GR and the protective tape PR were unwound from the lower part of the glass roll 2 , but these two ribbons GR and PR may be unwound from the upper part of the glass roll 2 .

In the above-described embodiment, the glass ribbon GR unwound from the glass roll 2 is cut by the cutting device 1 to obtain the mother glass film MG, but the method of preparing the mother glass film MG is not limited to this. For example, the glass ribbon GR may be formed by performing a forming section such as an overflow downdraw method or a float process, and the glass ribbon GR continuous with the forming section may be cut in units of a predetermined length on the downstream side of the forming section to obtain Mother glass film MG.

(cutting step) As shown in FIGS. 9 to 11 , the cutting step S2 is a step of cutting the mother glass film MG to obtain a glass film G. In this embodiment, a mother glass film cutting device 21 is used. Furthermore, in FIG. 9, XYZ is an orthogonal coordinate system. The X direction is the longitudinal direction of the mother glass film MG, the Y direction is the transverse direction of the mother glass film MG, and the Z direction is the thickness direction of the mother glass film MG.

As shown in FIG. 9 , the mother glass film cutting device 21 includes: a stage 22 for placing the mother glass film MG and the protective sheet PS; a positioning unit 23 for positioning the mother glass film MG and the protective sheet PS relative to the stage 22 Positioning: A pair of pressing rods 24 as a pressing member, on both sides of the planned cutting line (virtually existing line) C2 of the mother glass film MG, move the mother glass film MG and the protective sheet PS to the side of the mounting table 22 Pressing; and the breaking rod 25 as a bending stress imparting portion applies bending stress between the pair of pressing rods 24 along the line to cut C2. The cutting device 21 cuts only the mother glass film MG in the mother glass film MG and the protection sheet PS. The protective sheet PS protrudes from both longitudinal ends of the mother glass film MG.

The mounting table 22 is divided into a first support portion 22 a and a second support portion 22 b on the boundary of the cutting bar 25 extending along the X direction. In other words, the breaking rod 25 is disposed in the gap between the first support portion 22a and the second support portion 22b. The upper surface of the first support portion 22a and the upper surface of the second support portion 22b are planes that support the mother glass film MG and the protection sheet PS in a flat posture (preferably a horizontal posture).

The positioning part 23 is comprised by the plate-shaped body erected on the 2nd support part 22b of the mounting table 22. As shown in FIG. The positioning portion 23 is in contact with the front end surface MGa of the mother glass film MG in the Y direction. Furthermore, the positioning part 23 may be of any shape as long as it can position the front end surface MGa of the mother glass film MG, for example, may be a columnar (pin) shape or the like. The mother glass film MG is transferred from the first support portion 22 a to the second support portion 22 b in a state placed on the protection sheet PS, and is positioned by contacting the front end surface MGa with the positioning portion 23 . In addition, although the operation|work of transferring mother glass film MG from the 1st support part 22a to the 2nd support part 22b is performed manually by an operator, it may perform it on the conveyance surface, such as a conveyor.

The pressing bar 24 is plate-shaped, prism-shaped, or cylindrical-shaped extending along the X direction, and uses its lower surface (pressing surface) to press the mother glass film MG and the protective sheet PS toward the mounting table 22 . A handle 24 a to be held by an operator when pressing the mother glass film MG and the protection sheet PS is provided at a central portion in the longitudinal direction of the upper surface of the pressing bar 24 . Furthermore, the pressing rod 24 may be of any shape as long as it can press the mother glass film MG and the protective sheet PS, for example, it may be formed of a columnar shape or a cylindrical shape, and the pressing surface may be curved.

The pressing bar 24 is slidable in the Y direction so that the fixed position with respect to the mounting table 22 can be changed. Specifically, at positions corresponding to both ends of the pressing bar 24 in the X direction, the mounting table 22 is provided with a long hole 26 extending in the Y direction, and the pressing bar 24 can be placed within the range of the long hole 26. Swipe to move. Both ends of the pressing bar 24 can be fixed at any position of the elongated hole 26 by fastening members 27 such as bolts. Thereby, the distance L2 (see FIG. 10 ) between the pressing rod 24 and the cutting rod 25 (or the planned cutting line C2 ) can be changed according to the thickness of the mother glass film MG, and the effect of cutting can be easily and reliably adjusted. The magnitude of the bending stress of the predetermined line C2.

The breaking rod 25 is a long strip extending along the X direction, and has a semicircular shape with a cross section protruding upward in the Y direction. The planned cutting line C2 of the mother glass film MG is located on the cutting rod 25 . The folding rod 25 can be retracted to a position lower than the upper surface of the mounting table 22 as shown in FIG. Move up and down between rising states. In this raised state, the cutting rod 25 lifts the line to cut C2 of the mother glass film MG from below through the protective sheet PS, and holds it so that the upper surface side of the glass film G becomes convex. Thereby, bending stress is applied along the line to cut C2.

As shown in FIGS. 12A and 12B , the type of the breaking rod 25 can be changed according to the thickness of the mother glass film MG. In the present embodiment, when the thickness of the mother glass film MG is, for example, 100 μm or less, the semicircular breaking bar 25 has a relatively large curvature (for example, radius of curvature: 20 mm to 50 mm) in FIG. 12A . Change to the cutting rod 25 with a relatively small curvature (for example, radius of curvature: 5 mm to 25 mm) in FIG. 12B and a semicircular cross section. Thereby, in the cutting step S2, the type of the bending stress imparting portion can be changed according to the thickness of the mother glass film MG. That is, when the thickness of the mother glass film MG is thin, the mother glass film MG can be bent more steeply than when the thickness of the mother glass film MG is thick. Appropriate bending stress. Furthermore, the types of the breakable rods that can be changed may be three or more. In addition, as shown in FIG. 12A and FIG. 12B , the push-up height L3 of the folding rod 25 can also be adjusted according to the thickness of the mother glass film MG.

Next, a method of cutting the mother glass film MG to obtain the glass film G using the mother glass film cutting device 21 described above will be described.

Mother glass film MG is first positioned on mounting table 22 by positioning unit 23 in a state overlaid on protection sheet PS. Next, the mother glass film MG and the protective sheet PS are pressed toward the mounting table 22 side by the pressing bar 24 on both sides of the planned cutting line C2 of the mother glass film MG. In this state, the cutting rod 25 is raised to raise the mother glass film MG through the protective sheet PS. Thereby, the mother glass film MG is bent so that the upper surface side protrudes, and bending stress is applied along the line to cut C2. In this state, from the top of the cutting rod 25 (preferably above the central axis of the cutting rod 25) to one end of the planned cutting line C2 of the mother glass film MG (shown by arrow B in FIG. 9 The side edge of the mother glass film MG) is damaged using a damage applying member. As a result, the damage progresses linearly along the line to cut C2 to the other end of the line to cut C2 . That is, the damage applied to one portion of one end portion of the line to cut C2 progresses over the entire length in the longitudinal direction and the entire length in the thickness direction of the mother glass film MG due to the action of the bending stress. As a result, the folding (cutting) of the mother glass film MG is completed, and two rectangular glass films G are obtained.

The cutting device 21 is not limited to the above embodiment, and various changes are possible. For example, in the above-described embodiment, the breaking rod 25 as the bending stress imparting portion is set to have a semicircular cross section, but it may also be cylindrical or columnar, or may have an elliptical or other curved shape in cross section. Furthermore, only the upper portion may have such a curved shape, or may not have a curved shape. Furthermore, the number of objects of the breaking rod 25 is not limited to one, and it may consist of several.

In the above-described embodiment, the mother glass film MG is damaged above the breaking rod 25 , but the mother glass film MG may be damaged before the breaking rod 25 is raised, that is, before being cut. Furthermore, a scribe may be given other than a damage, and it is preferable to give a scribe to the glass ribbon GR before cutting.

In the above-described embodiment, as a method of imparting bending stress to the mother glass film MG, the cutting bar 25 is raised from below the mother glass film MG and bent so that the upper surface side of the mother glass film MG protrudes. However, an aspect in which the cutting rod 25 is lowered from above the mother glass film MG and bent such that the lower surface side of the mother glass film MG protrudes may also be employed.

(Evaluation step) As shown in FIGS. 13 to 16 , the evaluation step S3 is a step of evaluating the size of the glass film G in the state of the laminate LB formed by stacking the glass film G on the reference plate SP having a standard size.

As shown in FIG. 13 , the reference plate SP is formed with a colored marking portion SPa such as black on the contour portion of both sides SP1 and SP2 intersecting at one corner among the four sides SP1 to SP4 of the reference plate SP. Thereby, since it becomes easy to distinguish reference plate SP and glass film G, the position of the end surface of glass film G can be grasped easily. In addition, in this embodiment, the positioning part 32 of the measuring stage 31 mentioned later abuts on the remaining both sides SP3, SP4 of the reference plate SP which does not form the mark part SPa. In addition, the marking part SPa may be formed in all outline parts of the four sides SP1-SP4 of the reference plate SP. In FIGS. 14 to 16 , illustration of the marking portion SPa is omitted for convenience.

As shown in FIG. 14 , the reference plate SP has a glass plate GP and a buffer layer CL.

The glass plate GP is a base material of the reference plate SP, and has a rectangular shape accurately cut with a reference size. The glass plate GP preferably includes the glass film G obtained by cutting the mother glass film MG from the viewpoint of ease of acquisition and the like.

Buffer layer CL is formed in the surface side which contacts glass film G among both main surfaces of glass plate GP. The buffer layer CL includes, for example, a resin film such as polyethylene terephthalate (PET). Thereby, damage to the glass film G to be evaluated can be suppressed. In FIGS. 15 and 16 , illustration of the buffer layer CL is omitted for convenience.

As shown in FIG. 15 , in the evaluation step S3 , the laminate LB including the glass film G and the reference plate SP is placed on the measurement stage 31 having the positioning unit 32 with the glass film G side facing upward. The positioning part 32 is for positioning the two sides LB3 and LB4 intersecting at one corner among the four sides LB1 to LB4 of the laminate LB, and has a pair of cylindrical (pin)-shaped bodies 32a abutting on the side LB3 and a pair of sides LB4. abutting plate-shaped body 32b. In addition, the laminated body LB may be placed on the measurement stand 31 with the reference plate SP side facing up. Moreover, as long as the positioning part 32 can position both sides LB3 and LB4 of the laminated body LB, it may be arbitrary shape.

In the evaluation step S3, on both sides LB3 and LB4 of the laminated body LB, the respective end surfaces of the reference plate SP and the glass film G are positioned in contact with the cylindrical body 32a and the plate-shaped body 32b, and in this state, the For the remaining two sides LB1 and LB2 of the body LB, the respective end surfaces of the reference plate SP and the glass film G are touch-inspected with the operator's fingers. Thereby, the deviation between the position of the end surface of the glass film G and the position of the end surface of the reference plate SP is measured, and the size of the glass film G is evaluated. In this embodiment, both sides LB1 and LB2 of the laminate LB protrude from the measuring table 31 so that the respective end faces of the reference plate SP and the glass film G can be easily inspected by touch on both sides LB1 and LB2 of the laminate LB. Furthermore, the method of evaluating the size of the glass film G may be a method using image processing or the like, but a method using touch inspection is preferable because it is a simple and inexpensive method.

As shown in FIG. 16 , in the evaluation step S3, for example, when the glass film G is larger than the reference plate SP, when the projection size of the glass film G relative to the reference plate SP is below the first acceptable threshold value T1, The glass film is regarded as a good product, and when the glass film G is smaller than the reference plate SP, when the protruding dimension of the reference plate SP relative to the glass film G is below the second acceptable threshold value T2, the glass film G is regarded as a good product . In this case, it is preferable to set the first pass threshold value T1 to a value smaller than the second pass threshold value T2. Specifically, for example, the first pass threshold T1 is set to 1 mm, and the second pass threshold T2 is set to 2 mm. Thereby, since the first acceptance threshold T1 becomes a stricter standard than the second acceptance threshold T2, the probability that the glass film G larger than the reference plate SP is regarded as a good product can be reduced.

(film formation step) As shown in FIG. 17 and FIG. 18 , the manufacturing method of the glass film according to the present embodiment may further include a film forming step S4 of forming a film of the glass film G regarded as a good product in the evaluation step S3 .

In the film forming step S4, for example, the glass film G regarded as a good product in the evaluation step S3 is arranged on the film forming jig 41 .

As shown in FIG. 17 , the film-forming jig 41 has a base portion 42 on which the glass film G is placed, and a frame portion 43 that surrounds the glass film G placed on the base portion 42 . The frame portion 43 defines a rectangular space in plan view having a size corresponding to the reference plate SP, and the glass film G is arranged inside the frame portion 43 as shown in FIG. 18 . Then, in the state where the glass film G is placed on the film-forming jig 41 in this way, a film-forming mask (not shown) and the like are further placed on the upper surface of the glass film G, and a predetermined pattern is formed on the surface of the glass film G. film formation.

The glass film G formed in this way is used, for example, as a substrate for thin display devices or sensors such as liquid crystal displays and organic electroluminescence (EL) displays, or for packaging semiconductors such as solid-state imaging devices and laser diodes. Covers, and substrates of thin-film compound solar cells.

According to the manufacturing method as described above, in the cutting step S2, the mother glass film MG is cut due to the bending stress, and thus the cutting time can be shortened compared with the case of cutting using a laser. In addition, in the cutting step S2, since adjustments such as laser light are not required, cutting can be performed with a small number of people. On the other hand, in the case of cutting while applying a bending stress, the deviation from the planned cutting line C2 tends to be larger than that of laser cutting. Therefore, in evaluation step S3, the glass film G is laminated|stacked on the reference plate SP, and the size of the glass film G is evaluated. According to the evaluation method using such a reference plate SP, the size of the glass film G can be efficiently evaluated in a short time. In particular, when the touch inspection is performed on the end face of the laminate LB formed by stacking the glass film G on the reference plate SP, the evaluation time for the size of the glass film G can be greatly shortened compared with the case of using image processing, etc. Furthermore, equipment cost can also be suppressed. Therefore, even if the glass film G includes defective products whose size is evaluated as unacceptable in the evaluation step S3, the manufacturing time and personnel can be greatly reduced. Compared with the case of cutting, the cost can be reduced.

In addition, this invention is not limited to the structure of the said embodiment, nor is it limited to the said operation effect. Various changes can be made in this invention in the range which does not deviate from the summary of this invention.

In the above-mentioned embodiment, it is preferable that all four sides of the glass film G are cut using bending stress, but in the case of using laser cutting in the preparatory step S1 or the previous step, the four sides of the glass film G It may also contain laser cut edges. Here, laser cutting includes, for example, laser cutting or laser fusing.

1: Glass ribbon cutting device/cutting device 2: glass roll 2a: scroll 2v: Trolley 2z: roll out the beginning 3: cutting part 3v: abutment 3w: frame component 3x: support member 4: Folding and cutting stick 5: The first workbench 5a: The first transfer surface 5x: the upper end of the first transfer surface 6: The second workbench 6a: The second transfer surface 6x: the upper end of the second transfer surface 7: Sheet roll 8: Second folding cutting stick 9: Length adjustment mechanism 10: large diameter gear 11: Small diameter gear 12: worm gear 13: Worm 14: Fluid pressure cylinder 15:Lifting table 15a: shaft support 16: handle 17: Actuating shaft 18: Shaft support wall material 19: universal joint 20: switch 21:Mother glass film cutting device/cutting device 22: Carrying table 22a: the first support part 22b: the second support part 23: Positioning department 24: Press rod 24a: handle 25: Folding and cutting stick 26: long hole 27: fastening components 31: Measuring table 32: Positioning Department 32a: Cylindrical (pin) shaped body/cylindrical body 32b: plate-shaped body 41:Fixture for film formation 42: Abutment 43: frame A, B, W1, W2: Arrows C1, C2: Scheduled cutting line (virtually existing line) CL: buffer layer G: glass film GP: glass plate GR: glass ribbon GRa: the front end of the glass ribbon L1: Length L2: Distance L3: Push up height LB: laminated body LB1～LB4: side MG: mother glass film MGa: the front surface of the mother glass membrane PR: protective belt PS: Protective sheet S1: Preparatory steps S2: cut off step S3: Evaluation step S4: film forming step SP: reference plate SP1～SP4: side SPA: marking department T1: the first qualified threshold T2: Second qualified threshold X, Y, Z: directions α1, α2: tilt angle β: angle

FIG. 1 is a flowchart of a method for producing a glass film according to an embodiment of the present invention. 2 is a schematic front view showing a glass ribbon cutting device for carrying out the preparatory steps included in the manufacturing method of the glass film according to the embodiment of the present invention. 3 is an enlarged front view of a main part showing a glass ribbon cutting device for carrying out the preparatory steps included in the manufacturing method of the glass film according to the embodiment of the present invention. 4 is an enlarged perspective view of a main part showing a glass ribbon cutting device for carrying out the preparatory steps included in the manufacturing method of the glass film according to the embodiment of the present invention. Fig. 5 is an enlarged perspective view of main parts for explaining the state of implementation of the preparatory steps included in the manufacturing method of the glass film according to the embodiment of the present invention. Fig. 6 is an enlarged perspective view of main parts for explaining the state of implementation of the preparatory steps included in the manufacturing method of the glass film according to the embodiment of the present invention. 7 is an enlarged front view of a main part showing a modified example of a cutting rod of a glass ribbon cutting device for carrying out a preparatory step included in a glass film manufacturing method according to an embodiment of the present invention. 8 is a schematic front view showing a length adjustment mechanism of a glass ribbon cutting device for carrying out the preparatory steps included in the manufacturing method of the glass film according to the embodiment of the present invention. 9 is a schematic perspective view showing a mother glass film cutting device for carrying out a cutting step included in the method for producing a glass film according to the embodiment of the present invention. 10 is a schematic front view showing a mother glass film cutting device for carrying out a cutting step included in the method for producing a glass film according to the embodiment of the present invention. 11 is a schematic front view showing a mother glass film cutting device for explaining the implementation of the cutting step included in the glass film manufacturing method according to the embodiment of the present invention. Fig. 12A is an enlarged front view of main parts showing a cutting rod of a mother glass film cutting device for carrying out the cutting step included in the glass film manufacturing method according to the embodiment of the present invention. 12B is an enlarged front view of main parts showing a modified example of a cutting rod of a mother glass film cutting device for carrying out a cutting step included in the glass film manufacturing method according to the embodiment of the present invention. 13 is a schematic plan view showing a reference plate used in an evaluation step included in the method for producing a glass film according to the embodiment of the present invention. Fig. 14 is an I-I sectional view of Fig. 13 . Fig. 15 is a schematic perspective view for explaining the implementation status of the evaluation step included in the method for producing a glass film according to the embodiment of the present invention. Fig. 16 is an enlarged plan view of main parts for explaining the implementation status of the evaluation step included in the method for producing a glass film according to the embodiment of the present invention. Fig. 17 is a schematic perspective view for explaining the state of implementation of a film forming step included in the method for producing a glass film according to the embodiment of the present invention. Fig. 18 is a schematic perspective view for explaining the state of implementation of a film forming step included in the method for producing a glass film according to the embodiment of the present invention.

S1: Preparatory steps

S2: cut off step

S3: Evaluation step

Claims (14)

A method for manufacturing a glass film is a method for manufacturing a glass film, the method for manufacturing a glass film is characterized in that it comprises: Preparatory steps for preparing the mother glass membrane; A step of cutting the mother glass film by applying a bending stress along a line to cut the mother glass film to obtain a glass film; and An evaluation step of overlaying the glass film on a reference plate having a standard size and evaluating the size of the glass film. The method for producing a glass film according to claim 1, wherein in the preparation step, a bending stress is applied along a line to cut the glass ribbon unwound from the glass roll to cut the glass ribbon to obtain the The mother glass film. The method for manufacturing a glass film according to claim 2, wherein, in the preparation step, the glass ribbon is cut using a glass ribbon cutting device, and the glass ribbon cutting device includes: a first transfer unit for The glass ribbon unwound from the glass roll is guided along a first transfer surface inclined upward toward the downstream side; a second transfer surface inclined downward toward the downstream side; and a bending stress imparting part that supports the glass ribbon from below at the top between the first transfer part and the second transfer part, and along Bending stress is applied to the line to cut of the glass ribbon. The method for producing a glass film according to claim 3, wherein the type of the bending stress imparting portion of the glass ribbon cutting device is changed according to the thickness of the glass ribbon. The method for manufacturing a glass film according to any one of claim 1 to claim 4, wherein, in the cutting step, a mother glass film cutting device is used to cut the mother glass film, and the mother glass The film cutting device includes: a mounting table for mounting the mother glass film; a positioning part for positioning the mother glass film relative to the mounting table; a pair of pressing members for cutting the mother glass film. press both sides of the predetermined line toward the mounting table; and a bending stress imparting part that presses the mother glass film in a direction away from the mounting table between the pair of pressing members, and along the The line to cut of the mother glass film applies bending stress. The method of manufacturing a glass film according to claim 5, wherein the type of the bending stress imparting portion of the mother glass film cutting device is changed according to the thickness of the mother glass film. The method of manufacturing a glass film according to claim 5 or claim 6, wherein the position of the pressing member of the mother glass film cutting device relative to the mounting table is changed according to the thickness of the mother glass film, In order to change the distance from the planned cutting line of the mother glass film. The method for manufacturing a glass film according to any one of claim 1 to claim 7, wherein the reference plate has a colored marking portion on at least a part of the outline of the main surface of the reference plate. The method for manufacturing a glass film according to any one of claim 1 to claim 8, wherein the reference plate has a glass plate as a base material. The method for manufacturing a glass film according to any one of claim 1 to claim 9, wherein the reference plate has a buffer layer on the side of the contact surface with the glass film. The method for producing a glass film according to any one of claim 1 to claim 10, wherein, in the evaluation step, the end face of the laminate formed by laminating the glass film on the reference plate is evaluated. Touch to check. The method for manufacturing a glass film according to any one of claim 1 to claim 11, wherein the reference plate and the glass film are respectively rectangular in shape, In the evaluation step, the reference plate and the glass film are placed in contact with the positioning portion on two sides intersecting at one corner among the four sides of the laminate formed by stacking the glass film on the reference plate. Positioning was carried out by touching, and the size of the glass film was evaluated on the remaining two sides of the laminate. The method for manufacturing a glass film according to any one of claim 1 to claim 12, wherein, in the evaluation step, when the glass film is larger than the reference plate, when the glass film is relatively When the protruding dimension of the reference plate is below the first qualified threshold, the glass film is regarded as a good product. If the glass film is smaller than the reference plate, when the reference plate is relatively When the protruding dimension of the glass film is below the second acceptable threshold value, the glass film is regarded as a good product, and The first pass threshold is less than the second pass threshold. The method for producing a glass film according to any one of claim 1 to claim 13, wherein the glass film that is regarded as a good product in the evaluation step is placed in a film-forming film corresponding to the size of the reference plate. Use the inside of the frame part of the jig.

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