TWI809108B - Manufacturing method of glass film - Google Patents

Abstract

The manufacturing method of the glass film of the present invention includes: a cutting step, in the state where the glass film G is supported by the support member 2 through the heat insulating sheet T from the back side, by heating with the laser L and following the The heating utilizes the cooling of the refrigerant W to cause the initial crack Sa formed on the planned cutting line V of the glass film G to develop along the planned cutting line V, and the glass film G is cut. Laser cutting is performed on the glass film G in a state in which the heat-resistant layer R is arranged between the region including the line V to cut and the heat insulating sheet T. FIG.

Description

Manufacturing method of glass film

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

The glass film is, for example, thin plate glass having a thickness of 200 μm or less, and the production steps generally include a step of cutting the glass film into desired sizes.

As one of the methods for cutting the glass film, there is laser cutting. In this method, first, an initial crack is formed on a line to cut (a virtual line) at one end of the glass film, that is, one end of the line to cut. Thereafter, the heated region heated by the laser and the cooled region followed by the heated region cooled by the refrigerant are sequentially scanned from one end to the other end of the line to cut the glass film. Thereby, the glass film is cut (full body cut) by utilizing the thermal stress generated by the temperature difference between the heated region and the cooled region to develop an initial crack along the planned cutting line.

However, since the glass film is very thin, the heat obtained by heating by the laser or cooling by the refrigerant is easily conducted to supporting members such as a platen that supports the glass film from the back side, and dissipated. As a result, there may be a problem that the temperature difference between the heating by the laser and the cooling by the refrigerant for generating thermal stress cannot be sufficiently ensured, and the initial cracks may not develop accurately along the planned cutting line.

Therefore, in order to solve such a problem, for example, as disclosed in Patent Document 1, the glass film may be supported by a supporting member via a heat insulating sheet (for example, a resin sheet). [Prior art literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2011-144092

[Problem to be Solved by the Invention] However, when the glass film is supported by the supporting member via the heat insulating sheet, a new problem that the heat insulating sheet is burned to the glass film by heating by laser may arise. If the heat insulating sheet is fired in this way, it is necessary to remove the fired heat insulating sheet from the glass film by washing or the like after the cutting step, and the production efficiency of the glass film deteriorates. In addition, it may not be possible to remove the heat insulating sheet by burning, which may also cause defects in the glass film.

The object of the present invention is to prevent the heat insulating sheet from being burned to the glass film by heating by laser, and to improve the production efficiency of the glass film. [Means to solve the problem]

In order to solve the above-mentioned problems, the present invention is a method of manufacturing a glass film, which includes: a cutting step, in the state where the glass film is supported by a support member through a heat insulating sheet from the back side, by using a laser The heating by radiation and the cooling by the refrigerant following the heating allow the initial cracks formed on the planned cutting line of the glass film to develop along the planned cutting line to cut the glass film. The method for manufacturing the glass film is characterized in that: In the cutting step, laser cutting is performed on the glass film in a state in which the heat-resistant layer is arranged between the region including the line to cut and the heat insulating sheet of the glass film. According to such a structure, since the heat-resistant layer is disposed between the region including the line to cut on the glass film and the heat-insulating sheet, it is possible to prevent the heat-insulating sheet from being burned to the glass film by heating with a laser.

In the above structure, it is preferable that the width of the heat-resistant layer in the direction perpendicular to the planned cutting line is larger than the spot diameter of the laser on the surface of the glass film. Thereby, since the irradiation range of a laser is fully accommodated in the formation range of a heat-resistant layer, the burning of a heat insulating sheet can be prevented more reliably.

In the above structure, it is preferable that the heat-resistant layer is paper. Thereby, a heat-resistant layer can be prepared easily and cheaply.

In the above structure, preferably, between at least one region of the glass film bounded by the line to cut and the support member, a support rod extending along the line to cut is arranged at a position other than directly below the line to cut, Thereby, the glass film is cut|disconnected in the state which floated the part containing the line to cut of the glass film from a support member. Thereby, even if the thermal stress for developing the initial crack becomes insufficient near the other end of the planned cutting line, the initial crack can continue to grow. Therefore, it is possible to prevent a cutting residue from being generated near the other end of the line to cut.

At this time, the heat-resistant layer is preferably disposed at a position not overlapping the support rod. The glass film tends to slide easily with respect to the heat-resistant layer, and it is considered that when the heat-resistant layer is arranged between the support rod and the glass film, the supported state of the glass film becomes unstable. Therefore, it is preferable to set it as the structure which does not arrange|position a heat-resistant layer between a support rod and a glass film as mentioned above. [Effect of the invention]

According to the present invention, it is possible to prevent the heat insulating sheet from being burned to the glass film by heating by laser, and to improve the production efficiency of the glass film.

Hereinafter, a method for producing a glass film according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, XYZ in the figure is an orthogonal coordinate system. The X direction and the Y direction are horizontal directions, and the X direction is made into a width direction. The Z direction is the vertical direction.

＜First Embodiment＞ As shown in FIGS. 1 and 2 , the cutting device 1 used in the method for manufacturing a glass film according to the first embodiment cuts the glass film G by laser along the planned cutting line V, and includes a support member 2 and a laser oscillator 3. , the refrigerant injection nozzle 4 and the support table 5 .

The glass film G is a rectangular single sheet. The size of one side of the glass film G is preferably from 300 mm to 3000 mm, and the thickness is preferably from 5 μm to 300 μm, more preferably from 30 μm to 200 μm.

The line V to be divided is a linear imaginary line that spans between both sides facing the direction perpendicular to the width direction of the glass film G. As shown in FIG. In the present embodiment, in the glass film G, a total of two lines V are present at the boundary between the central portion Ga in the width direction and the end portions Gb in the width direction. Therefore, when laser cutting is performed along the two planned cutting lines V, the width direction end parts Gb on both sides are respectively separated from the width direction central part Ga. Here, the end portion Gb in the width direction includes a thicker portion (also referred to as an edge portion) than the center portion Ga in the width direction due to, for example, shrinkage in the molding process. Of course, the width direction end part Gb is not limited to the case where it has an edge part, It may be substantially the same thickness as the width direction center part Ga.

The glass film G is arrange|positioned on the support member 2 via the heat insulating sheet T. As shown in FIG. The heat insulating sheet T suppresses the heat transfer to the support member 2 of the heat of the heating area H formed by the irradiation of the laser L or the heat of the cooling area C formed by the injection of the refrigerant W, and the dissipation thereof. The heat insulating sheet T is preferably lower in thermal conductivity than the supporting member 2 . As the heat insulating sheet T, resin sheets such as foamed resin or nonwoven fabric can be used, for example. The heat insulating sheet T is preferably an elastic sheet.

The heat-resistant layer R is arrange|positioned between the area|region containing the planned cutting line V of the glass film G, and the heat insulating sheet T. The heat-resistant temperature of the heat-resistant layer R is higher than the heat-resistant temperature of the heat-insulating sheet T, for example, it is 80-600 degreeC. In the present embodiment, the heat-resistant layer R includes a heat-resistant sheet (heat-resistant belt) adhered to the heat-insulating sheet T. As shown in FIG. The heat-resistant sheet may be, for example, a glass fiber sheet, a polyimide resin sheet, a metal sheet, or the like, and is paper (liner paper) in this embodiment. Furthermore, the heat-resistant layer R may also be a heat-resistant film (such as polyurethane, silicone, carbon, silicon dioxide, alumina, zirconia, etc.) formed on the heat-insulating sheet T by coating or the like. film, etc.). The heat-resistant layer R is not limited to being fixed to the heat-insulating sheet T by adhesion or the like, and may be simply placed on the heat-insulating sheet T without being fixed.

The support member 2 supports the glass film G from the back side, and is constituted by a platen in this embodiment. The upper surface of the supporting member 2 is preferably a horizontal single plane.

The laser oscillator 3 is disposed above the glass film G in a movable state along the line V to be cut. The laser oscillator 3 irradiates the line V to be cut with laser L to form a heated region H, and scans the heated region H on the line V to be cut along with its movement.

In this embodiment, the width D1 of the heat-resistant layer R is greater than the spot diameter of the laser L on the surface of the glass film G, for example, 1 mm˜30 mm. The contact area of the heat-insulating sheet T and the glass film G (supporting area of the heat-insulating sheet T) is larger than the contact area of the heat-resistant layer R and the glass film G (supporting area of the heat-resistant layer R). Specifically, the supporting area of the heat insulating sheet T is preferably 5 times or more the supporting area of the heat-resistant layer R. Since most of the glass film G is supported by the heat insulating sheet T by this, sliding of the glass film G is suppressed, and the attitude|position of the glass film G is also stabilized at the time of laser cutting.

The refrigerant injection nozzle 4 is disposed above the glass film G in a movable state along the line V to be cut, similarly to the laser oscillator 3 . The cooling medium injection nozzle 4 sprays the cooling medium (for example, mist water) W to the part of the planned cutting line V irradiated by the laser L to form the cooling region C, and scans the cooling region C on the planned cutting line V as it moves. Thereby, as shown in FIG. 1 , the heated region H and the cooled region C following the heated region H are sequentially scanned from one end Va side to the other end Vb side of the line V to be divided.

The speed at which the laser oscillator 3 and the refrigerant injection nozzle 4 move in a direction parallel to the planned cutting line V is preferably in the range of 20 mm/s˜200 mm/s.

The support table 5 supports the vicinity of one end Va of the line to break V of the glass film G from the back side, and is used when an initial crack Sa is formed at one end Va of the line V to break. The support table 5 is constituted by a flat plate formed of a predetermined material such as metal or resin. The upper surface of the support table 5 is preferably a horizontal plane. The support table 5 is fixed to the support member 2 by any fixing method such as fastening with screws or adhesion with tape or the like. In the present embodiment, the heat insulating sheet T is positioned in the Y direction in a state where its edge is in contact with the edge of the support table 5 . Also in this state, the heat insulating sheet T is positioned in the X direction with the support table 5 as a reference so that the heat-resistant layer R is arranged at a position corresponding to the planned cutting line V. Of course, the heat-insulating sheet T and the heat-resistant layer R can also be arranged on the support table 5 . At this time, it is preferable that the heat-resistant layer R is arranged over the entire length of the line V to be cut. Furthermore, the supporting platform 5 may not be configured.

Next, the manufacturing method of the glass film of 1st Embodiment is demonstrated. This manufacturing method includes a cutting step using the cutting device 1 configured as above. In addition, the case where laser cutting is performed along a pair of sides facing the width direction of the glass film G in the cutting step is described below, but laser cutting is also performed along the other pair of sides by the same method.

In the cutting step, first, as shown in FIG. 2 , on the one hand, the support table 5 supports the vicinity of one end Va of the planned cutting line V of the glass film G in a flat state; The surface side of the film G is rotated, and an initial crack Sa is formed at one end Va of the line V to be cut. Here, the direction in which the wheel cutter 6 is rotated is preferably a direction along the planned cutting line V from the inner side of the glass film G toward the end side. In addition, it is preferable to set the distance of the rotary wheel cutter 6 within the range of 5 mm - 10 mm. Furthermore, the mechanism for forming the initial crack Sa is not limited to the wheel cutter 6 , for example, a diamond scribe tool or a laser may also be used. In addition, an initial crack Sa may be formed in advance at one end Va of the planned cutting line V of the glass film G in a step preceding the cutting step.

After the initial crack Sa is formed in this way, as shown in FIG. 3 , irradiation of the laser L along the line V along which the initial crack Sa is started, and injection of the refrigerant W following the irradiation are performed. Thereby, the initial crack Sa develops along the line to split V toward the other end Vb by utilizing the thermal stress generated by the temperature difference between the heated region H and the cooled region C (see FIG. 1 ).

At this time, since the heat-resistant layer R is arranged between the region including the planned cutting line V of the glass film G and the heat-insulating sheet T, it is possible to prevent the heat-insulating sheet T from being burnt to the glass by heating with the laser L. Membrane G. Therefore, the glass film G can be manufactured efficiently without requiring the operation|work of removing the baked heat insulating sheet T from the glass film G after a cutting process. In addition, softening and melting of the heat insulating sheet T are also suppressed, so that the heat insulating sheet T can be reused economically.

The method for manufacturing a glass film according to the first embodiment includes, for example, a forming step, a slow cooling step, and a sheet cutting step before the cutting step. In addition, the manufacturing method of the glass film of the first embodiment includes, for example, a washing step (including a drying step), an inspection step, and a packing step after the cutting step. Furthermore, a heat treatment step may also be implemented after the board picking step. In addition, the end surface processing step may be performed after the cutting step. Of course, it is also possible to implement only the cutting step alone.

In the forming step, the glass ribbon is formed from the molten glass by a known method such as an over-flow down draw method or a float method.

In the slow cooling step, the formed glass ribbon is slowly cooled in order to reduce warpage and internal strain of the formed glass ribbon.

In the sheet picking step, the slowly cooled glass ribbon is cut at predetermined lengths to obtain a plurality of glass films. Or, after taking out the slowly cooled glass ribbon once in a roll shape, you may cut|disconnect for every predetermined length, and the glass film of several sheets may be obtained.

In the heat treatment step, for example, the glass film is heat treated in a heat treatment furnace.

In the end surface processing step, end surface processing including end surface grinding, grinding and corner cutting is performed on the glass film cut to a predetermined size in the cutting step.

In the washing step, the glass film is transported in an inclined posture while being washed and then dried. Of course, the cleaning step can also be performed on the glass film in a horizontal position.

In the inspection step, check whether there is no damage, dust, dirt, etc. on the surface of the cleaned glass film, and/or whether there are no internal defects such as air bubbles and foreign objects. The inspection is performed using an optical inspection device such as a camera.

In the packing step, the glass films satisfying the required quality as a result of the inspection are packed. Packing is carried out by laminating multiple pieces of glass film on a predetermined pallet (pallet) horizontally or vertically. At this time, you may intervene the protective sheet containing a backing paper, a foamed resin, etc. between the lamination direction of a glass film.

<Second Embodiment> The difference between the manufacturing method of the glass film of the second embodiment and the manufacturing method of the glass film of the first embodiment is the state of supporting the glass film G in the cutting step. Hereinafter, this difference will be described, and the same reference numerals will be assigned to common structures, and detailed description will be omitted.

Here, in the vicinity of the other end Vb of the line V to be divided, it is difficult to secure a space for forming the heating region H and the cooling region C at the same time. Therefore, if the glass film G is to be laser cut using only the thermal stress, the thermal stress becomes insufficient near the other end Vb of the line V to be cut, and a cut remaining portion may be formed. Therefore, a further object of the cutting step included in the method of manufacturing the glass film according to the second embodiment is to prevent the formation of such cut residues.

As shown in FIG. 4 and FIG. 5 , in the cutting step included in the method of manufacturing the glass film G according to the second embodiment, on the support member 2 , a support member for supporting the vicinity of each planned cutting line V of the glass film G from the back side is arranged. Support Stick 7. The supporting rod 7 is formed of a long flat plate in a direction parallel to the planned cutting line V, and its upper surface is preferably a horizontal plane.

The support rods 7 are located at positions other than directly below the respective planned cutting lines V in the vicinity of the respective planned cutting lines V, between the end portions Gb in the width direction and the supporting member 2, and between the central portion Ga in the width direction and the supporting member 2. , two parallel to the planned cutting line V are arranged. There are a total of two planned cutting lines V, so a total of four support rods 7 are arranged on the support member 2 . Thereby, the portion of the glass film G including the respective planned cutting lines V is lifted by the two support rods 7 arranged in parallel, and is held in a state of floating from the support member 2 between the two support rods 7 . Furthermore, the portion of the glass film G including the planned cutting line V may be in a horizontal planar shape between the two support rods 7, or may be in a convex curved shape protruding upward, or may be protruding downward. concave shape.

When the two supporting rods 7 are arranged side by side on both sides of the planned cutting line V in this way, it is preferable that the width of the end portion Gb in the width direction is relatively large. However, the width of the central portion Ga in the width direction is made larger than the width of the end portions Gb in the width direction. Here, the following values can be exemplified as the case where the width of the end portion Gb in the width direction is relatively large. That is, when the thickness of the glass film G is 200 μm, the width of the end portion Gb in the width direction is 46 mm or more, and when the thickness of the glass film G is 100 μm, the width of the end portion Gb in the width direction is 70 mm or more. In addition, the width|variety of the edge part Gb of the said width direction is made into the value measured by placing the glass film G on a horizontal plane. In addition, since the preferable range of the width of the end part Gb in the width direction varies depending on various conditions such as the thickness of the glass film G or the thickness or width of the support rod 7, it is not limited to the examples.

The distance D2 between the two support rods 7 is preferably, for example, 5 mm to 50 mm (15 mm in this embodiment). The thickness of the support rod 7 is preferably, for example, 0.5 mm to 5 mm (2 mm in this embodiment). The width of the support rod 7 is preferably, for example, 5 mm to 30 mm (10 mm in this embodiment). The thickness or width of each supporting rod 7 is preferably the same.

The support rod 7 is fixed to the support member 2 by an arbitrary fixing method similarly to the support stand 5 . The support rod 7 may be detachable from the support member 2 or may be integrated with the support member 2 .

As for the material of the support rod 7, metal, resin, etc. are mentioned, for example. When the support rod 7 is made of metal, it is preferable to bond and fix the entire back of the support rod 7 to the support member 2, and when the support rod 7 is made of resin, it is preferable to glue only the two ends of the support rod 7 in the longitudinal direction. connected to the support member 2. Of course, the fixing method or fixing position of the support rod 7 is not particularly limited.

The supporting rods 7 are continuously arranged over the entire length of the glass film G in a direction parallel to the line V to cut. In addition, the support rod 7 may be arrange|positioned intermittently or only in a part over the whole length of the glass film G in the direction parallel to the line V to cut|disconnect. At this time, the support rod 7 is preferably disposed at least near the other end of the line V (the end opposite to one end Va of the line V formed with the initial crack Sa) Vb.

The support area of the support member 2 (the contact area of the support member 2 and the glass film G) is larger than the support area of the support rod 7 (the contact area of the support rod 7 and the glass film G). Specifically, the supporting area of the supporting member 2 is preferably 5 times or more the supporting area of the supporting rod 7 . Thereby, since most of the glass film G is supported by the support member 2, the attitude|position of the glass film G is also stabilized at the time of laser cutting.

It is preferable that the heat-resistant layer R does not overlap with the support rod 7 . In this embodiment, the heat-resistant layer R is arranged between the two supporting rods 7 arranged in parallel so as not to overlap with the supporting rods 7 . Not limited to this embodiment, the heat-resistant layer R may overlap with the support rod 7.

In the supporting aspect of the glass film G as described above, the heat-resistant layer R is arranged between the region including the line V to be cut of the glass film G and the heat insulating sheet T, similarly to the cutting step of the first embodiment. , Therefore, it is possible to prevent the thermal insulation sheet T from being burnt to the glass film G by heating with the laser L during laser cutting.

In addition, in the present embodiment, two support rods 7 are arranged on both sides of the planned division line V, so the part of the glass film G that includes the planned division line V is supported by the two support rods during laser cutting. 7 lifts up and floats from the supporting member 2 between the two supporting rods 7. If the glass film G is cut by laser in such a supporting state, even if the thermal stress for the development of the initial crack Sa becomes insufficient near the other end Vb of the planned cutting line V, it is possible to prevent the formation of the cutting residue. .

Although the cause of this phenomenon has not been elucidated, it is considered as follows. That is, the portion of the glass film G including the line V to be cut floats from the support member 2 between the two support rods 7, so the width of the boundary between the cut portion (the portion where the cut has been completed) S on the line V is The end portions Gb in the direction and the center portion Ga in the width direction are intended to return to a more stable state (for example, a flat state) independently. The direction and/or magnitude of such a force acting when returning to a stable state are different from each other at the widthwise end Gb and the widthwise central portion Ga bordering on the cut portion S. As a result, it can be considered that the uncut portion (the portion where the cut is not completed) on the planned cut line V is different from the thermal stress caused by laser cutting, such as tearing force or shearing force, which promotes the development of the initial crack Sa. The auxiliary force plays a role. Therefore, it is considered that even if the thermal stress for developing the initial crack Sa near the other end Vb of the planned cutting line V becomes insufficient, the growth of the initial crack Sa continues due to this auxiliary force, preventing the generation of the cut residue.

Here, in the present embodiment, laser cutting is performed in a state where the end portion Gb in the width direction of the glass film G is lifted from the support member 2 at a position other than the support rod 7 , but the present invention is not limited thereto. For example, the edge of the end portion Gb in the width direction may be in line contact with the support member 2 via the heat insulating sheet T, and the remaining portion of the end portion Gb in the width direction may be in line contact with the support rod 7 except through the heat insulating sheet T. The positions other than the contact part float from the supporting member 2 . In addition, the portion including the edge of the end portion Gb in the width direction may be brought into surface contact with the support member 2 through the heat insulating sheet T, and the remaining portion of the end portion Gb in the width direction may be in contact with the supporting member 2 except through the heat insulating sheet T. The position other than the contact portion of the rod 7 floats from the supporting member 2 .

<Third Embodiment> The difference between the manufacturing method of the glass film of the third embodiment and the manufacturing method of the glass film of the second embodiment is the state of supporting the glass film G in the cutting step. Hereinafter, this difference will be described. In addition, the same code|symbol is attached|subjected to the common structure, and detailed description is abbreviate|omitted.

As shown in FIG. 6, in the cutting step included in the manufacturing method of the glass film according to the third embodiment, in the vicinity of each planned cutting line V, except for the position directly below each planned cutting line V, only at the end portion in the width direction Between Gb and the support member 2, one support bar 7 is arranged parallel to the line V to be cut. In other words, the support rod 7 is not disposed between the central portion Ga in the width direction and the support member 2 . There are a total of two planned cutting lines V, so a total of two support rods 7 are arranged. Thereby, the portion of the glass film G including the lines V to be cut is lifted by one support rod 7, and floats from the support member 2 on one side of the one support rod 7, that is, on the central portion Ga side in the width direction. maintain the raised state. Furthermore, the portion of the glass film G including the planned cutting line V may be inclined on one side of the support rod 7, or may be convexly curved upward, or may be convex downward. concave shape. In addition, in this embodiment, the width direction end part Gb is hold|maintained in the state which floated from the support member 2 at the position other than the contact part with the support rod 7 of the heat insulating sheet T as a whole, but the width direction end part Gb The portion including the edge of Gb may be in contact with the support member 2 via the heat insulating sheet T (line contact or surface contact).

When one supporting rod 7 is disposed only on one side of the line V to be cut in this way, the width of the end portion Gb in the width direction is preferably relatively small. Here, the following values can be exemplified as the case where the width of the end portion Gb in the width direction is relatively small. That is, when the thickness of the glass film G is 200 μm, the width of the end portion Gb in the width direction is less than 46 mm (preferably less than 45 mm), and when the thickness of the glass film G is 100 μm, the width of the end portion Gb in the width direction is less than 70 mm. mm (preferably less than 50 mm). In addition, the width|variety of the said width direction edge part Gb is made into the value measured by placing the glass film G on a horizontal plane. In addition, since the preferable range of the width of the end part Gb in the width direction varies depending on various conditions such as the thickness of the glass film G or the thickness or width of the support rod 7, it is not limited to the examples.

The thickness of the support rod 7 is preferably, for example, 0.5 mm to 5 mm (2 mm in this embodiment). The width of the support rod 7 is preferably, for example, 5 mm to 30 mm (10 mm in this embodiment).

A portion of the glass film G including the line V to be cut has a first contact portion P1 in contact with the support bar 7 through the heat insulating sheet T, and a second contact portion P2 in contact with the support member 2 through the heat insulating sheet T. . The distance D3 between the first contact portion P1 and the second contact portion P2 is preferably, for example, 30 mm to 200 mm (140 mm in this embodiment).

The planned cutting line V is preferably located between the first contact portion P1 and the second contact portion P2 and is biased toward the first contact portion P1 side. In other words, it is preferable that the interval D4 between the second contact portion P2 and the line V is larger than the interval D5 between the first contact portion P1 and the line V. The interval D4 is preferably twice or more than the interval D5.

It is preferable that the heat-resistant layer R does not overlap with the support rod 7 . In the present embodiment, the heat-resistant layer R is disposed on one side of the support rod 7 , that is, on the central portion Ga side in the width direction, so as not to overlap the support rod 7 . Not limited to this embodiment, the heat-resistant layer R may overlap with the support rod 7.

In the supporting form of the glass film G as described above, similar to the cutting steps of the first embodiment and the second embodiment, between the region including the planned cutting line V of the glass film G and the heat insulating sheet T Since the heat-resistant layer R is disposed, it is possible to prevent the heat-insulating sheet T from being burned to the glass film G by heating with the laser L.

Furthermore, it can be considered that even in the supporting form in which one support rod 7 is arranged on only one side of the line V to be cut, similarly to the cutting step of the second embodiment, for the uncut portion on the line V to be cut, Depending on the thermal stress obtained by laser cutting, for example, an auxiliary force such as tearing force or shearing force acts to promote the development of the initial crack Sa. Therefore, even if the thermal stress for developing the initial crack Sa becomes insufficient in the vicinity of the other end Vb of the line V to be split, it is possible to prevent the formation of the remaining cut portion. This effect is easily enjoyed especially when the line V to be cut is deviated to the side of the first contact portion P1.

This invention is not limited to the said embodiment at all, It can further be implemented in various forms in the range which does not deviate from the summary of this invention.

In the above-described first to third embodiments, the glass film may be moved while maintaining the laser oscillator and the refrigerant injection nozzle at constant positions. In this case, a moving mechanism such as a moving table or a belt conveyor can be used for the supporting member. In addition, when laser cutting is performed while moving the glass film in this way, the glass film can also be continuously supplied from a forming section that performs a known forming method such as an overflow method or a float method. Alternatively, the glass film may be continuously supplied from a glass roll obtained by winding a long glass film into a roll shape. At this time, as for the heat insulating sheet, what is continuously supplied from a sheet roll in which a long heat insulating sheet is wound into a roll shape, and which overlaps with the glass film in the middle of the conveyance path can be used. At this time, the heat-resistant layer may be preliminarily arranged on the heat-insulating sheet wound up into a roll. Alternatively, the heat-resistant layer may be sequentially bonded to a heat-insulating sheet or the like unwound from a sheet roll, and may be arranged.

In the first to third embodiments described above, the case where the laser cutting is performed along the planned cutting line provided at the boundary between the end portions in the width direction and the central portion in the width direction of the glass film has been described, but the present invention is not limited to here. For example, it can also be applied to the case of performing laser cutting along a planned cutting line provided at a predetermined position in the width direction central part of the glass film. In addition, the number of planned cutting lines is not limited to two, and may be one or three or more.

In the above-mentioned second and third embodiments, the case where the supporting rod is an elongated flat plate in the direction parallel to the line to cut has been described, but the shape of the supporting rod is not limited to this. As long as the support rod is long in the direction parallel to the intended cutting line, it can be, for example, a cylinder (including an elliptical cylinder), a polygonal cylinder (including a triangle or a pentagonal or larger polygonal cylinder), and a half cylinder (including a half-ellipse cylinder). wait. In addition, it is the same about the shape of a support stand.

In the second and third embodiments described above, the supporting rods are arranged at positions other than directly below the planned cutting line of the glass film, but the supporting rods may also be arranged at the planned cutting line of the glass film. directly below the .

1‧‧‧Cutting device 2‧‧‧Supporting components 3‧‧‧Laser oscillator 4‧‧‧Refrigerant injection nozzle 5‧‧‧Support Desk 6‧‧‧Wheel cutting machine 7‧‧‧Support stick C‧‧‧cooling area D1‧‧‧width D2, D3, D4, D5‧‧‧interval G‧‧‧Glass film Ga‧‧‧Central part in the width direction Gb‧‧‧Width direction end H‧‧‧Heating area L‧‧‧Laser P1‧‧‧first contact part P2‧‧‧Second contact part R‧‧‧heat-resistant layer S‧‧‧cutting part Sa‧‧‧initial crack T‧‧‧Heat insulation sheet V‧‧‧cut off the scheduled line One end of Va‧‧‧ Vb‧‧‧the other end W‧‧‧refrigerant X, Y, Z‧‧‧direction

FIG. 1 is a plan view showing a cutting step included in the method for producing a glass film according to a first embodiment and a cutting device for performing the cutting step. Fig. 2 is an A-A sectional view of Fig. 1 , and is a view showing a state in which an initial crack is formed at one end of a line to cut. FIG. 3 is a cross-sectional view taken along line B-B in FIG. 1 , and is a view showing a state immediately after a cut portion is formed. 4 is a plan view showing a cutting step included in the method for producing a glass film according to a second embodiment and a cutting device for performing the cutting step. Fig. 5 is a sectional view taken along line E-E of Fig. 4 , and is a view showing a state immediately after a cut portion is formed. 6 is a cross-sectional view showing a cutting step included in the method of manufacturing a glass film according to a third embodiment and a cutting device for performing the cutting step, and is a view showing a state immediately after a cut portion is formed.

1‧‧‧Cutting device

2‧‧‧Supporting components

3‧‧‧Laser oscillator

4‧‧‧Refrigerant injection nozzle

D1‧‧‧width

G‧‧‧Glass film

Ga‧‧‧Central part in the width direction

Gb‧‧‧Width direction end

L‧‧‧Laser

R‧‧‧heat-resistant layer

S‧‧‧cutting part

T‧‧‧Heat insulation sheet

V‧‧‧cut off the scheduled line

W‧‧‧refrigerant

X, Z‧‧‧direction

Claims (5)

A method of manufacturing a glass film, comprising: a cutting step, in which the glass film is supported by a support member through a heat insulating sheet from the back side, by heating by laser and by using a refrigerant following the heating cooling, the initial cracks formed on the planned cutting line of the glass film develop along the planned cutting line, and the glass film is cut. The manufacturing method of the glass film is characterized in that: in the cutting step and performing laser cutting on the glass film in a state in which a heat-resistant layer is arranged between a region of the glass film including the line to cut and the heat insulating sheet. The method for manufacturing a glass film according to claim 1, wherein the width of the heat-resistant layer in a direction perpendicular to the planned cutting line is larger than the spot diameter of the laser on the surface of the glass film. The method for manufacturing a glass film as described in item 1 or item 2 of the patent application, wherein the heat-resistant layer is paper. The method for manufacturing a glass film according to claim 1 or 2, wherein between at least one region of the glass film bounded by the planned cutting line and the supporting member, all but the A support rod extending along the line to break is arranged at a position other than the line directly below the line to break so that a part of the glass film including the line to break is lifted from the supporting member Cut the glass membrane. The method for manufacturing a glass film according to claim 4, wherein the heat-resistant layer is arranged at a position not overlapping with the support rod.