Sheet dividing method and sheet dividing device

Abstract

This sheet dividing method comprises: a preparation step for preparing a soft sheet (11) having a brittle material layer (2) on which an easy-to-break line (4) extending in a first direction is formed; a setting step in which a peripheral region (11C) of the easy-to-break line (4) in the sheet (11) is bent into a concave arc shape in a side view, and a tip portion (81) of a breaking aid (8) is disposed in a recess of the concave arc-shaped peripheral region (11C); and a breaking step in which a tensile force is applied to the peripheral region (11C) in a second direction, which is a direction orthogonal to the first direction, so that the concave arc-shaped peripheral region (11C) returns to the front end (81) side of the breaking aid (8), and the sheet (11) is broken along the easy-to-break line (4).

Description

Technical Field

[0001] The invention relates to a method and a device for cutting a sheet material having a brittle material layer. Background Art

[0002] In many cases, a protective material is disposed on the outermost surface of an image display device such as a smartphone, a television, or a personal computer. As the protective material, a sheet including glass is used, for example. The sheet is cut into a predetermined shape and predetermined size according to the application.

[0003] In

[0017] of Patent Document 1 and Figure 7 The following contents are disclosed: in a state where a workbench 10a having an elastic body 11a and a workbench 10b having an elastic material 11b are pressurized in directions away from each other by a spring 15, a glass substrate 1 is set on the elastic body 11a and the elastic body 11b, and the glass substrate 1 is pressed from the central part on the opposite side of the gap S by a pressing component 14, thereby separating the glass substrate 1.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2002-18797 Summary of the invention

[0007] Generally, when a brittle material layer such as glass is divided into two divided pieces, there is a concern that fine cracks may be generated on the divided surface (the divided surface is the end surface of the divided piece).

[0008] The breaking method of the above patent document has the potential risk of not being able to fully prevent cracks from occurring on the breaking surface. In addition, the breaking method of the above patent document has the potential risk of breaking away from the gap (easy break line). Hereinafter, the generation of cracks and breaking away from the easy break line are sometimes referred to as "faulty breaking".

[0009] Technical problem to be solved by the invention

[0010] An object of the present invention is to provide a sheet material cutting method and a cutting device which can prevent poor cutting and satisfactorily cut a sheet material having a brittle material layer.

[0011] Technical solutions for solving technical problems

[0012] The first cutting method of the sheet material of the present invention comprises: a preparation step of preparing a soft sheet material having a brittle material layer formed with an easy-to-break line extending along a first direction; a setting step of making the peripheral area of ​​the easy-to-break line in the sheet material bend into a concave arc shape when viewed from the side, and arranging the front end of a breaking aid in the concave part of the concave arc-shaped peripheral area; and a breaking step of applying a tensile force to the peripheral area in a second direction, which is orthogonal to the first direction, so that the concave arc-shaped peripheral area returns to the front end side of the breaking aid and the sheet material is cut along the easy-to-break line.

[0013] A second breaking method of the present invention is that, in the first breaking method, the front end portion of the breaking auxiliary tool is formed into an arc shape with a curvature radius of not less than 1 mm and not more than 6 mm in a side view.

[0014] The third breaking method of the present invention is that in the first or second breaking method, the arc-shaped front end portion of the breaking auxiliary device is a straight line extending along the first direction when viewed from above, and the front end portion of the breaking auxiliary device is arranged in a manner that overlaps with the easy-to-break line when viewed from above.

[0015] The fourth cutting method of the present invention is that in any of the first to third cutting methods, the area on the right side of the second direction and the area on the left side of the second direction of the sheet are respectively maintained, and the area on the right side and the area on the left side are stretched in opposite directions respectively, thereby applying a tensile force to the peripheral area along the second direction.

[0016] A fifth breaking method of the present invention is that, in the fourth breaking method, the right region and the left region are stretched at an equal speed.

[0017] A sixth breaking method of the present invention is that, in the fourth or fifth breaking method, a stretching speed of the right region and the left region is 5 mm / sec to 50 mm / sec.

[0018] A seventh breaking method of the present invention is that, in any one of the first to sixth breaking methods, the deflection amount of the peripheral area is not less than 2 mm and not more than 20 mm.

[0019] An eighth breaking method of the present invention is that in any one of the first to seventh breaking methods, the brittle material layer is glass having a thickness of not less than 20 μm and not more than 120 μm.

[0020] According to another aspect of the present invention, a sheet material cutting device is provided.

[0021] The breaking device of the present invention is a breaking device that breaks a soft sheet having a brittle material layer formed with an easy-to-break line extending in a first direction along the easy-to-break line, and comprises: a loading platform for loading the sheet; a stretching mechanism that applies a stretching force to a peripheral area of ​​the easy-to-break line in the sheet in a second direction that is orthogonal to the first direction; and a breaking auxiliary tool having a front end, wherein the loading platform comprises a right workbench portion arranged on the right side of the second direction and a left workbench portion arranged on the left side of the second direction, and between the right workbench portion and the left workbench portion, a space portion for accommodating the bent peripheral area is provided in order to allow the peripheral area to bend into a concave arc shape when viewed from the side, and the front end portion of the breaking auxiliary tool can enter the space portion.

[0022] Effects of the Invention

[0023] According to the method and apparatus of the present invention, cracks and deviation from the easy breaking line are unlikely to occur, and a sheet having a brittle material layer can be separated well. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a perspective view showing a first example of the sheet material according to the first embodiment.

[0025] Figure 2 So Figure 1 Cross-sectional view taken along line II-II.

[0026] Figure 3 It is a perspective view showing a second example of the sheet material according to the first embodiment.

[0027] Figure 4 It is a perspective view showing a third example of the sheet material according to the first embodiment.

[0028] Figure 5 So Figure 4 Cross-sectional view taken along the V-V line.

[0029] Figure 6 This is a perspective view showing a composite material formed by laminating a brittle material layer and a resin layer.

[0030] Figure 7 This is an explanatory diagram schematically illustrating a step of forming an easy-to-break line in a brittle material layer.

[0031] Figure 8 It is a schematic illustration of Figure 7 FIG. 1 is a diagram for explaining an example of a method for setting the focus of a laser beam oscillated by an ultrashort pulse laser light source.

[0032] Fig. 9 It is a side view showing a first example of a breaking device.

[0033] Fig.10 It is a top view of the breaking device.

[0034] Fig.11 So Fig.10 Cross-sectional view taken along line XI-XI.

[0035] Fig.12 It is a reference stereogram of the breaking device.

[0036] Fig.13 (a) is a side view showing a state where a sheet is placed on a placement surface of a cutting device, and (b) is a side view showing a state where a peripheral region of the sheet is bent into a concave arc shape.

[0037] Fig.14 This is a side view including an enlarged view of the main parts showing a state in which the front end portion of the breaking assist tool is arranged in a concave portion of the peripheral region bent into a concave arc shape.

[0038] Fig.15 It is a side view including an enlarged view of the main part showing a state where a tensile force acts on the peripheral region bent in a concave arc shape.

[0039] Fig.16 This is a side view showing a state where the sheet is divided into two.

[0040] Fig.17 It is a perspective view showing a fourth example of the sheet material according to the second embodiment.

[0041] Fig.18 So Fig.17 Cross-sectional view taken along line XVIII-XVIII.

[0042] Fig.19 It is a cross-sectional view showing a fifth example of the sheet material according to the second embodiment.

[0043] Fig. 20 It is a cross-sectional view showing a sixth example of the sheet material according to the second embodiment.

[0044] Fig.21 This is an explanatory diagram schematically illustrating a method of forming a defective portion when producing a sheet according to the second embodiment.

[0045] Fig. 22 This is a side view showing a state in which the sheet of the second embodiment is placed on the placement surface of the dividing device and the peripheral area of ​​the sheet is bent into a concave arc shape.

[0046] Fig.23 This is a side view showing a state in which a sheet is placed on the placing surface of the dividing device according to the third embodiment and the peripheral region of the sheet is bent into a concave arc shape.

[0047] Fig.24 This is a cross-sectional view showing a state in which a sheet is placed on the placing surface of the dividing device according to the fourth embodiment and the peripheral region of the sheet is bent into a concave arc shape.

[0048] Fig.25 This is a side view showing a state in which a sheet is placed on the placing surface of the dividing device of the fifth embodiment and the peripheral area of ​​the sheet is bent into a concave arc shape. DETAILED DESCRIPTION

[0049] In this specification, the first direction and the second direction refer to directions orthogonal to the surface of the sheet. "Approximately" in this specification refers to the range allowed in the technical field to which the present invention belongs. "Top view" in this specification refers to observation from a direction orthogonal to the surface of the sheet, and "side view" refers to observation from a direction orthogonal to the thickness surface (end surface) of the sheet, and observation is from one side of the first direction to the opposite side. The top view shape and the side view shape refer to the shape of the object when viewed from top and side.

[0050] In this specification, when a plurality of numerical ranges are described, such as above a lower limit value and below an upper limit value, any lower limit value and any upper limit value can be selected to set a numerical range of “above any lower limit value and below any upper limit value”.

[0051] In addition, please note that the sizes, scales, shapes, etc. of layers, parts, and components shown in the drawings may be different from the actual ones.

[0052] The sheet material cutting method of the present invention is a method of cutting a soft sheet material having a brittle material layer formed with an easy-to-break line extending in a first direction along the easy-to-break line.

[0053] The sheet cutting method of the present invention comprises: a preparation step of preparing a soft sheet having a brittle material layer with an easy-to-break line formed thereon; a setting step of making the peripheral area of ​​the easy-to-break line of the sheet bend into a concave arc shape when viewed from the side, and arranging the front end of a breaking aid in the concave portion of the concave arc-shaped peripheral area; and a breaking step of applying a tensile force to the peripheral area along a second direction, thereby pulling the concave arc-shaped peripheral area back toward the front end side of the breaking aid, and breaking the sheet along the easy-to-break line.

[0054] The sheet to be cut has a brittle material layer on which an easy-to-break line extending in the first direction is formed, and may further have an arbitrary layer such as a resin layer as necessary.

[0055] In this way, the peripheral region bent into a concave arc shape when viewed from the side is stretched and returned to the front end side of the separation auxiliary tool, thereby separating the sheet material well along the easy breaking line.

[0056] (First embodiment)

[0057] The first embodiment describes a case where a soft sheet material consisting of only a brittle material layer is divided.

[0058] The sheet material has flexibility to bend, and in the present embodiment, the sheet material is composed only of a brittle material layer having an easy-to-break line formed therein.

[0059] [Sheet]

[0060] Figure 1 as well as Figure 2 A first example of the sheet 11 before cutting (a sheet to be cut) is shown.

[0061] The sheet material 11 to be cut is, for example, in sheet shape. The top view shape of the sheet material 11 is, for example, a roughly rectangular shape such as a roughly rectangular shape or a roughly square shape. However, the top view shape of the sheet material is not limited to a roughly rectangular shape when viewed from above, and may be, for example, a roughly circular shape, a roughly elliptical shape, a roughly triangular shape, a roughly hexagonal shape, or a roughly polygonal shape, etc.

[0062] The sheet 11 is composed of a brittle material layer 2. An easily breakable line 4 extending in a first direction is formed in the brittle material layer 2. The easily breakable line 4 is formed by processing the brittle material layer 2 in order to easily cut off a part of the brittle material layer 2 (the part where the easily breakable line 4 is formed). Examples of the easily breakable line 4 include a groove, a seam perforation line, and the like. The groove does not penetrate the brittle material layer 2 in the thickness direction, but is formed by continuously connecting and extending the incisions engraved to the middle part of the brittle material layer 2 in the thickness direction. The groove extending in the first direction is formed by continuously connecting and extending the incisions in the first direction. The seam perforation line is formed by intermittently arranging smaller through holes or non-through smaller holes penetrating the brittle material layer 2. The seam perforation line extending in the first direction is formed by a plurality of the through holes or holes continuously arranged at small intervals in the first direction.

[0063] Figure 1 as well as Figure 2 The sheet material 11 of the first example shown has a groove 41 formed as an easy-to-break line 4 on one side of the brittle material layer 2. The groove 41 (easy-to-break line 4) extends from an end edge a in the first direction of the brittle material layer 2 to an end edge b in the opposite direction of the first direction. In addition, the groove 41 (easy-to-break line 4) is formed in a substantially straight line shape when viewed from above. In addition, the groove 41 (easy-to-break line 4) is not limited to being substantially straight line shape when viewed from above, and may also be substantially curved shape when viewed from above. The groove 41 is open (open) on one side. In the example shown in the figure, in the sheet material 11 of the first example, one side of the brittle material layer is the side where the groove is formed, and the opposite side is the side where the groove is not formed. Hereinafter, the side where the groove is formed is sometimes referred to as the "formed side", and the side where the groove is not formed is sometimes referred to as the "non-formed side".

[0064] The depth of the groove 41 is not particularly limited, and is, for example, not less than 1 μm and less than half the thickness of the brittle material layer 2 , and preferably not less than 1 μm and not more than 10 μm.

[0065] Figures 3 to 5 Other examples (second and third examples) of sheets before cutting are shown. Figures 3 to 5 In the description of the sheet 11 of the first example, the description is sometimes omitted for the same structure as that of the sheet 11 of the first example.

[0066] Figure 3 The sheet material 12 of the second example shown is the same as the sheet material 11 of the first example except that grooves 41 and 42 (easy break lines 4) are formed on one side and the opposite side (the opposite side is the side opposite to the one side) of the brittle material layer 2. In the sheet material 12 of the second example, both the one side and the opposite side of the brittle material layer 2 are formed sides. In this case, the groove 41 on one side is open (open) on the one side, and the groove 42 on the other side is open (open) on the opposite side.

[0067] The depth of the groove 42 is not particularly limited, and is, for example, 0.2 μm or more and 1 / 4 of the thickness of the brittle material layer 2 or less, and preferably 0.5 μm or more and 2 μm or less.

[0068] Figure 4 as well as Figure 5 The sheet material 13 of the third example shown is the same as the sheet material 11 of the first example except that a perforated seam line 43 is formed as the easy breaking line 4. In the example shown in the figure, a perforated seam line 43 in which a plurality of through holes are arranged at a small interval (a perforated seam line 43 in which a plurality of through holes are intermittently formed along the first direction) is illustrated. In the sheet material 13 of the third example, both one side and the opposite side of the brittle material layer 2 are formed sides.

[0069] In addition, at least one easy-to-break line 4 extending in the first direction may be formed on the sheets 11, 12, and 13. Therefore, two or more easy-to-break lines 4 extending in the first direction may be formed at intervals in the second direction on the sheets 11, 12, and 13, or one or two or more easy-to-break lines 4 extending in the first direction may be formed at intervals, and one or two or more easy-to-break lines 4 extending in the second direction may be formed at intervals (both not shown).

[0070] The brittle material layer 2 is obtained by forming a brittle material into a sheet shape.

[0071] Examples of the brittle material forming the brittle material layer 2 include glass, single crystal silicon, and polycrystalline silicon.

[0072] As glass, soda-lime glass, boric acid glass, aluminosilicate glass, quartz glass and sapphire glass can be exemplified according to the classification of composition. In addition, alkali-free glass and low-alkali glass can be exemplified according to the classification of alkali components. The content of alkali metal components (such as Na2O, K2O, Li2O) in the glass is preferably 15% by weight or less, and more preferably 10% by weight or less.

[0073] The thickness of the brittle material layer 2 is not particularly limited, but is, for example, 20 μm to 120 μm, preferably 30 μm to 110 μm, and more preferably 30 μm to 100 μm.

[0074] When the brittle material forming the brittle material layer 2 is glass, the light transmittance of the brittle material layer 2 at a wavelength of 550 nm is preferably 85% or more. When the brittle material forming the brittle material layer 2 is glass, the refractive index of the brittle material layer 2 at a wavelength of 550 nm is preferably 1.4 or more and 1.65 or less. When the brittle material forming the brittle material layer 2 is glass, the density of the brittle material layer 2 is preferably 2.3 g / cm 3 Above 3.0g / cm 3 Below, more preferably 2.3g / cm 3 Above 2.7g / cm 3 the following.

[0075] When the brittle material forming the brittle material layer 2 is glass, a commercially available glass plate may be used directly as the brittle material layer 2, or a commercially available glass plate may be ground to a desired thickness and used. Examples of commercially available glass plates include "7059", "1737" or "EAGLE2000" manufactured by Corning, "AN100" manufactured by Asahi Glass, "NA-35" manufactured by NNHTECHNO GLASS, "OA-10" manufactured by Nippon Electric Glass, and "D263" or "AF45" manufactured by Schott.

[0076] [Step of preparing a sheet having a breakable line formed thereon]

[0077] The preparation step is a step of preparing a soft sheet having a brittle material layer formed with an easy-to-break line extending in the first direction.

[0078] The sheets of the above-mentioned various examples are obtained by forming a breakable line in the brittle material layer. Figure 1 as well as Figure 2 A method for manufacturing the sheet 11 of the first example is shown.

[0079] The sheet 11 provided with the groove 41 (fragile line 4) as in the first example is obtained by forming the fracture line in a composite material formed by bonding a brittle material layer and a resin layer and removing the resin layer.

[0080] <Composite materials>

[0081] like Figure 6 As shown, a composite material 10 having a brittle material layer 2 and a resin layer 3 is prepared.

[0082] In the manufacture of the composite material 10 having the brittle material layer 2 and the resin layer 3, for example, the brittle material layer 2 and the resin layer 3 are stacked by any appropriate method. For example, the brittle material layer 2 and the resin layer 3 can be stacked by a so-called roll-to-roll method. That is, the longitudinal brittle material layer 2 and the longitudinal resin layer 3 are transported in the longitudinal direction while being aligned in their respective longitudinal directions to be bonded to each other, thereby obtaining a longitudinal composite material 10 in which the brittle material layer 2 and the resin layer 3 are stacked. By cutting the obtained longitudinal composite material 10 into a predetermined shape when viewed from above, a Figure 6 A sheet-shaped composite material 10 as shown.

[0083] Alternatively, for example, the brittle material layer 2 and the resin layer 3 may be cut into predetermined shapes in a plan view and then stacked, thereby obtaining a sheet-shaped composite material 10 .

[0084] As described above, the brittle material layer 2 is a layer formed of a brittle material such as glass, single crystal silicon, or polycrystalline silicon.

[0085] The resin layer 3 has a resin film layer 31, and may also have a bonding layer 32 as required. The resin layer 3 having the resin film layer 31 and the bonding layer 32 is laminated and bonded to the brittle material layer 2 via the bonding layer 32. As the bonding layer 32, any appropriate bonding layer can be used, but representative examples include adhesives and adhesives containing resin materials. Examples of the adhesive include acrylic adhesives, polyurethane adhesives, silicone adhesives, etc., and examples of the adhesive include acrylic adhesives, epoxy adhesives, etc.

[0086] Examples of the resin material for forming the resin film layer 31 include acrylic resins such as polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), and polymethyl methacrylate (PMMA), cyclic olefin polymers (COP), cyclic olefin copolymers (COC), polycarbonate (PC), polyurethane resins, polyvinyl alcohol (PVA), polyimide (PI), polytetrafluoroethylene (PTFE), polyvinyl chloride (PVC), polystyrene (PS), triacetyl cellulose (TAC), polyethylene naphthalate (PEN), ethylene vinyl acetate (EVA), polyamide (PA), silicone resins, epoxy resins, liquid crystal polymers, and various resin foams.

[0087] The resin film layer 31 may be a single layer or a multilayer composed of a plurality of layers of the same or different types. When the resin film layer 31 is composed of a plurality of layers, the layers may be directly bonded or may be bonded via a binder layer or an adhesive layer.

[0088] The thickness of the resin film layer 31 is not particularly limited, but is, for example, not less than 20 μm and not more than 500 μm.

[0089] <Formation of easy-to-break line (groove)>

[0090] like Figure 7 As shown, in a manner opposite to the brittle material layer 2 of the composite material 10 before the groove is formed ( Figure 7 In the example shown in (a), an ultrashort pulse laser light source 51 is arranged on the upper side of the brittle material layer 2. Then, a laser beam C1 (ultrashort pulse laser beam) oscillated (pulsed) by the ultrashort pulse laser light source 51 is irradiated to the composite material 10 from the brittle material layer 2 side of the composite material 10 along the predetermined separation line of the composite material 10. The brittle material forming the brittle material layer 2 is removed by the laser beam C1, thereby forming the groove 41. In this embodiment, as Figure 7 As shown in (b), the grooves 41 are formed to be connected integrally along the planned separation line.

[0091] exist Figure 7 In the example shown, the straight line DL extending in the Y direction of two orthogonal directions (X direction and Y direction) in the plane (in the XY two-dimensional plane) of the composite material 10 is shown as the predetermined breaking line. The predetermined breaking line DL may be actually drawn on the composite material 10 as a visually recognizable display, or its coordinates may be input in advance to a control device (not shown) that controls the relative positional relationship between the laser beam C1 and the composite material 10 on the XY two-dimensional plane. Figure 7The predetermined separation line DL shown is a virtual line whose coordinates are input to the control device in advance and is not actually drawn on the composite material 10. In addition, the predetermined separation line DL is not limited to a straight line, and can also be a curve. In this case, a groove 41 that is roughly curved when viewed from above is formed. By determining the predetermined separation line DL according to the use of the sheet material and separating the sheet material, it is possible to obtain a split piece of any shape.

[0092] As a method of irradiating the laser beam C1 along the predetermined separation line DL of the composite material 10 (a method of scanning the laser beam C1), for example, the sheet-like composite material 10 may be placed on an XY two-axis table (not shown) and fixed (for example, fixed by adsorption), and the XY two-axis table may be driven according to a control signal from a control device, thereby changing the relative position of the composite material 10 with respect to the laser beam C1 on the XY two-dimensional plane. In addition, it is also possible to fix the position of the composite material 10, and use a galvanometer mirror or a polygon mirror driven according to a control signal from the control device to deflect the laser beam C1 oscillated from the ultrashort pulse laser light source 51, thereby changing the position of the laser beam C1 irradiated to the composite material 10 on the XY two-dimensional plane. Furthermore, it is also possible to simultaneously adopt both the scanning of the composite material 10 using the above-mentioned XY two-axis table and the scanning of the laser beam C1 using a galvanometer mirror or the like.

[0093] The brittle material forming the brittle material layer 2 is removed by utilizing the filamentation phenomenon of the laser beam C1 oscillated from the ultrashort pulse laser light source 51 or by applying a multi-focus optical system (not shown) or a Bessel beam optical system (not shown) to the ultrashort pulse laser light source 51 .

[0094] In addition, regarding the use of the filamentation phenomenon of ultrashort pulse laser beams or the application of multi-focus optical systems or Bessel beam optical systems in ultrashort pulse laser light sources, it is recorded in John Lopez et al. "GLASS CUTTING USING ULTRASHORT PULSED BESSEL BEAMS", [online], October 2015, International Congress on Applications of Lasers & Electro-Optics (ICALEO), [retrieved on July 17, 2020], URL: https: / / www.researchgate.net / publication / 284617626_GLASS_CUTTING_USING_ULTRASHORT_PULSED_BESSEL_BEAMS]. In addition, Trumpf in Germany sells products related to glass processing that apply multi-focus optical systems to ultrashort pulse laser light sources. As described above, it is well known to utilize the filamentation phenomenon of an ultrashort pulse laser beam or to apply a multi-focus optical system or a Bessel beam optical system to an ultrashort pulse laser light source, and thus further detailed description is omitted here.

[0095] The laser beam C1 oscillated from the ultrashort pulse laser light source 51 and irradiated to the composite material 10 preferably has a wavelength that is absorbed by the bonding layer 32 and not absorbed by the brittle material layer 2. Specifically, the wavelength of the laser beam C1 is preferably 500 nm or more and 2500 nm or less, which shows a higher transmittance when the brittle material forming the brittle material layer 2 is glass. In order to effectively induce nonlinear optical phenomena (multiphoton absorption), the pulse width of the laser beam C1 is preferably 100 picoseconds or less, and more preferably 50 picoseconds or less. The pulse width of the laser beam C1 is set to, for example, 350 femtoseconds or more and 10,000 femtoseconds or less. The oscillation mode of the laser beam C1 may be a single pulse oscillation or a multi-pulse oscillation in a burst mode.

[0096] The focus of the laser beam C1 oscillated from the ultrashort pulse laser light source 51 and irradiated to the composite material 10 is set to be located on the side opposite to the side where the ultrashort pulse laser light source 51 is arranged ( Figure 7 In the example shown in (a), the surface of the brittle material layer 2 (ie, the lower side) Figure 7 In the example shown in (a), it is the interface with the bonding layer 32 or a position farther from the ultrashort pulse laser light source 51 than the surface ( Figure 7(a) is the lower position). As a result, the formed groove 41 becomes a non-penetrating processing mark (not open on the side opposite to the bonding layer 32 side) that opens on the bonding layer 32 side and extends toward the center of the thickness direction (Z direction) of the brittle material layer 2.

[0097] The mechanism for forming the non-through groove 41 opening on the side of the bonding layer 32 is not necessarily clear, but it is inferred that by setting the focus of the laser beam C1 at the interface between the brittle material layer 2 and the bonding layer 32 or at a position below the interface, the energy of the laser beam C1 is concentratedly absorbed near the interface between the bonding layer 32 and the brittle material layer 2 to generate heat, and the heat is conducted to the brittle material layer 2, so that the brittle material in the conducted portion is removed to form the groove 41.

[0098] Next, a method of setting the focal point of the laser beam C1 will be described.

[0099] Figure 8 1 is an explanatory diagram schematically illustrating an example of a method of setting the focus of the laser beam C1 oscillated from the ultrashort pulse laser light source 51 .

[0100] exist Figure 8 In the example shown, a multi-focus optical system is applied to the ultrashort pulse laser light source 51. Specifically, Figure 8 The multi-focal optical system shown is composed of three axicon lenses 51a, 51b, and 51c. Figure 8 As shown in FIG. 1 , if the spatial intensity distribution of the laser beam C1 oscillated from the ultrashort pulse laser light source 51 is assumed to be a Gaussian distribution, the laser beam C1 oscillated in the range from point A to point B where the intensity is relatively high is along Figure 8 The optical path shown by the middle dotted line converges at the focus AF. At this time, the focus set near the interface between the bonding layer 32 and the brittle material layer 2 is the focus AF where the laser beam C1 oscillating in the relatively high intensity range from point A to point B converges. The range from point A to point B is, for example, a range of intensities that is 90% or more of the maximum intensity of the spatial intensity distribution of the laser beam C1.

[0101] The positional relationship between the focus AF and the composite material 10 is adjusted so that the position of the focus AF of the laser beam C1 becomes the interface between the brittle material layer 2 and the bonding layer 32 or a position below the interface (specifically, a position at a distance H (H ≥ 0) downward from the interface). The distance H is preferably set to 0 μm to 800 μm, more preferably to 50 μm to 600 μm, and even more preferably to 200 μm to 400 μm.

[0102] The spot diameter of the laser beam C1 at the focal point AF is preferably set to 5 μm or less, and more preferably set to 3 μm or less.

[0103] In addition, when the filamentation phenomenon of the laser beam C1 is utilized, when the laser beam C1 passes through the brittle material layer 2, it is self-focused due to the Kerr effect, so that the spot diameter becomes smaller as it travels. Moreover, when the laser beam C1 converges to the energy threshold at which ablation occurs in the brittle material layer 2, the brittle material of the brittle material layer 2 is removed to form a groove 41. As described above, by setting the position where the laser beam C1 converges to the energy threshold at which ablation occurs (equivalent to the aforementioned focus AF) at the interface between the brittle material layer 2 and the bonding layer 32 or at a position below the interface, a non-through groove 41 can be formed that opens on the bonding layer 32 side and extends toward the center of the thickness direction (Z direction) of the brittle material layer 2.

[0104] By adjusting the power of the laser beam C1 oscillated from the ultrashort pulse laser light source 51 and the position (distance H) of the focus AF, the intensity (intensity in the range from point A to point B) of the energy used to form the groove 41 (remove the brittle material) can be adjusted. Thus, the depth of the groove 41 can be adjusted.

[0105] Similarly, by adjusting the power of the laser beam C1 oscillated from the ultrashort pulse laser light source 51 and the position of the focus AF, it is also possible to form a groove on the surface opposite to the interface between the brittle material layer 2 and the bonding layer 32 and adjust the depth of the groove. In this way, when the groove 42 is also formed on the opposite surface, it is possible to obtain Figure 3 Sheet 12 as shown.

[0106] <Peeling off the resin layer>

[0107] After the grooves 41 (and the grooves 42 as needed) are formed, the resin layer 3 (resin film layer 31 and bonding layer 32) is peeled off from the composite material 10 using a known peeling means such as a peeling roll. Figure 1 The sheet 11 shown consists only of the brittle material layer 2 formed with grooves 41, or Figure 3 The sheet 12 shown is composed only of the brittle material layer 2 in which the groove 41 unit and the groove 42 are formed.

[0108] <Other>

[0109] In addition, there are Figure 4 as well as Figure 5 The sheet 13 having the seam perforation line 43 as shown can be obtained, for example, by the method described in WO 2019 / 138967 filed by the applicant of the present application.

[0110] The sheet of the present invention is not limited to the case of being manufactured by a method using a laser light source, and for example, a sheet having a brittle material layer with an easy-to-break line such as a groove may be obtained by a conventionally known mechanical processing method such as removing the brittle material layer with a cutter wheel or the like.

[0111] [Breaking device]

[0112] Here, a breaking device for carrying out the breaking method of the present invention will be described.

[0113] Fig. 9 1 is a side view showing a first example of a cutting device for a sheet 11, Fig.10 is a top view of the breaking device 100, Fig.11 is a cross-sectional view of the breaking device 100 cut along the second direction, Fig.12 is a reference stereogram of the breaking device 100. Fig. 9 as well as Fig.10 In FIG. 1 , the sheet 11 is indicated by a dotted line.

[0114] Figures 9 to 12 The breaking device 100 shown is a device for breaking a soft sheet 11 having a brittle material layer 2 formed with a breakable line 4 extending in a first direction, along the breakable line 4 .

[0115] The breaking device 100 includes: a placing table for placing the sheet 11 to be broken; a stretching mechanism for applying a tensile force in the second direction to the peripheral area 11C of the easy breaking line 4 in the sheet 11; and a breaking auxiliary tool 8 having a front end 81.

[0116] The mounting table is divided into two in the second direction. The mounting table has a right table portion 6 arranged on the right side in the second direction and a left table portion 7 arranged on the left side in the second direction.

[0117] In order to make the peripheral region 11C bend into a concave arc shape when viewed from the side, a space portion S for accommodating the bent peripheral region 11C is provided between the right table portion 6 and the left table portion 7 .

[0118] The disconnection assist tool 8 is configured such that the front end portion 81 thereof can enter the space S.

[0119] Specifically, the right table portion 6 has a placement surface on which all or part of the right region 11R of the sheet 11 is placed. In the present embodiment, the right table portion 6 has: a first right table portion 61 having a first right placement surface 61a on which a part of the right region 11R is placed; and a second right table portion 62 having a second right placement surface 62a on which the other part of the right region 11R is placed. The first right table portion 61 is disposed on the left side of the second right table portion 62.

[0120] The first right loading surface 61a and the second right loading surface 62a constitute the loading surface of the right workbench portion 6. The first right loading surface 61a and the second right loading surface 62a may be on the same plane, or one of them may be slightly lower than the other. Fig. 9As shown, the first right placement surface 61a and the second right placement surface 62a are on the same plane and are horizontal.

[0121] The second right table section 62 is fixed to a fixing section 180 of the device. As the fixing section 180 of the device, a frame fixed to a location where the device is installed can be cited.

[0122] The second right stage portion 62 does not have a function of holding the sheet 11. Therefore, the sheet 11 placed on the second right placement surface 62a of the second right stage portion 62 can be freely moved along the second right placement surface 62a.

[0123] The first right stage section 61 includes a stretching mechanism section. That is, the first right stage section 61 corresponds to a stretching mechanism section also used as a placement table for placing a sheet.

[0124] Specifically, the first right stage 61 includes a right holding stage 63 for detachably holding the right region 11R of the sheet 11 and a right advancing and retreating device 64 for parallelly moving the right holding stage 63 in the second direction.

[0125] The surface of the right holding table 63 constitutes the first right placement surface 61 a. The right holding table 63 and the right advancing and retreating device 64 cooperate to form a stretching mechanism for stretching the right side region 11R of the sheet 11.

[0126] The right holding platform 63 is, for example, composed of a hollow shell extending in the first direction. In the example shown in the figure, the right holding platform 63 is, for example, composed of a hollow cube extending in the first direction. A plurality of through holes, i.e., right vents 65, which are connected to the inside and outside of the right holding platform 63, are formed on the surface of the right holding platform 63. The right holding platform 63 is connected to a right pipe 66 connected to the inside of the right holding platform 63, and an air suction device (not shown) such as a vacuum pump is connected to the right pipe 66.

[0127] The length of the right holding platform 63 in the first direction (hereinafter, the length in the first direction is referred to as "first direction length") is appropriately set within a range in which the right vent hole 65 does not protrude from the sheet 11. For example, the first direction length of the right holding platform 63 is substantially the same as the first direction length of the sheet 11, or is slightly shorter than the first direction length of the sheet 11.

[0128] The right advance and retreat device 64 has a right drive unit 641 and a right shaft unit 642 that advances and retreats to the right and left sides of the second direction by using the right drive unit 641. The right drive unit 641 is fixed to, for example, the second right workbench unit 62 fixed to the fixed portion 180 of the device. The end of the right shaft unit 642 is mounted on the right holding platform unit 63. If the right shaft unit 642 advances to the left side of the second direction by the drive of the right drive unit 641, the right holding platform unit 63 moves parallel to the left side of the second direction with it. On the other hand, if the right shaft unit 642 retreats to the right side of the second direction by the drive of the right drive unit 641, the right holding platform unit 63 moves parallel to the right side of the second direction with it. As the right advance and retreat device 64, for example, a pneumatic or hydraulic cylinder, a cylinder based on a motor, a rack and pinion mechanism, a connecting rod mechanism, a cam mechanism, etc. can be used.

[0129] By placing the sheet 11 on the first right loading surface 61a, the air suction device is operated to suck air, so that negative pressure is formed in the right holding table 63. Therefore, the right side region 11R of the sheet 11 facing the right vent 65 is sucked, and the right side region 11R is held on the first right loading surface 61a of the right holding table 63. While the right side region 11R is being sucked and held on the right holding table 63, the right advancing and retreating device 64 is used to move the right holding table 63 to the left and right in the second direction, thereby enabling the right side region 11R to be moved parallel to the left and right in the second direction. Moreover, by moving the right side region 11R parallel to the right in the second direction, a tensile force can be applied to the peripheral region 11C. Fig. 9 as well as Fig.10 The hollow thick arrow indicates the moving direction of the right holding stage 63 .

[0130] On the other hand, by releasing the air suction, the suction and holding of the sheet 11 by the right holding table 63 is released. Therefore, the sheet 11 can be placed on the first right loading surface 61a of the right holding table 63 or removed from the first right loading surface 61a without air suction.

[0131] The left table section 7 has a placement surface for placing all or part of the left area 11L of the sheet 11. In the present embodiment, the left table section 7 has: a first left table section 71 having a first left placement surface 71a for placing part of the left area 11L; and a second left table section 72 having a second left placement surface 72a for placing the other part of the left area 11L. The first left table section 71 is disposed on the right side of the second left table section 72.

[0132] The first left loading surface 71a and the second left loading surface 72a constitute the loading surface of the left workbench 7. The first left loading surface 71a and the second left loading surface 72a may be on the same plane, or one of them may be slightly lower than the other. Fig. 9 As shown, the first left placement surface 71a and the second left placement surface 72a are on the same plane and are horizontal.

[0133] The second left table portion 72 is fixed to the fixing portion 180 of the device.

[0134] The second left stage portion 72 does not have a function of holding the sheet 11. Therefore, the sheet 11 placed on the second left placement surface 72a of the second left stage portion 72 can be freely moved along the second left placement surface 72a.

[0135] The first left stage 71 includes a stretching mechanism. That is, the first left stage 71 corresponds to a stretching mechanism that also serves as a placement table for placing a sheet.

[0136] Specifically, the first left stage 71 includes a left holding stage 73 for detachably holding the left region 11L of the sheet 11 and a left advancing and retreating device 74 for parallelly moving the left holding stage 73 in the second direction.

[0137] The surface of the left holding table 73 constitutes the first left placement surface 71 a. The left holding table 73 and the left advancing and retreating device 74 cooperate to form a stretching mechanism for stretching the left side area 11L of the sheet 11.

[0138] The left holding platform 73 is, for example, composed of a hollow shell extending in the first direction. In the example shown in the figure, the left holding platform 73 is, for example, composed of a hollow cube extending in the first direction. A plurality of through holes, i.e., left vents 75, are formed on the surface of the left holding platform 73 and communicate with the inside and outside of the left holding platform 73. The left holding platform 73 is connected to a left tube 76 that communicates with the inside of the left holding platform 73, and an air suction device (not shown) such as a vacuum pump is connected to the left tube 76.

[0139] The length of the left holding platform 73 in the first direction (hereinafter, the length in the first direction is referred to as "first direction length") is appropriately set within a range in which the left vent hole 75 does not protrude from the sheet 11. For example, the first direction length of the left holding platform 73 is substantially the same as the first direction length of the sheet 11, or is slightly shorter than the first direction length of the sheet 11.

[0140] The left advance and retreat device 74 has a left drive unit 741 and a left shaft unit 742 that advances and retreats to the right and left sides of the second direction by using the left drive unit 741. The left drive unit 741 is fixed to, for example, the second left workbench unit 72 fixed to the fixed portion 180 of the device. The end of the left shaft unit 742 is mounted on the left holding platform unit 73. If the left shaft unit 742 advances to the right side of the second direction by the drive of the left drive unit 741, the left holding platform unit 73 moves parallel to the right side of the second direction with it. On the other hand, if the left shaft unit 742 retreats to the left side of the second direction by the drive of the left drive unit 741, the left holding platform unit 73 moves parallel to the left side of the second direction with it. As the left advance and retreat device 74, for example, a pneumatic or hydraulic cylinder, a cylinder based on a motor, a rack and pinion mechanism, a connecting rod mechanism, a cam mechanism, etc. can be used.

[0141] By placing the sheet 11 on the first left loading surface 71a, the air suction device is operated to suck air, so that negative pressure is formed in the left holding table 73. Therefore, the left area 11L of the sheet 11 facing the left vent 75 is sucked, and the left area 11L is held on the first left loading surface 71a of the left holding table 73. While the left area 11L is sucked and held on the left holding table 73, the left holding table 73 is moved to the right and left sides in the second direction by the left advance and retreat device 74, so that the left area 11L can be moved parallel to the right and left sides in the second direction. Moreover, by moving the left area 11L parallel to the left side in the second direction, a tensile force can be applied to the peripheral area 11C. Fig. 9 as well as Fig.10 The hollow thick arrow indicates the moving direction of the left holding table 73.

[0142] On the other hand, by releasing the air suction, the suction and holding of the sheet 11 by the left holding platform 73 is released. Therefore, the sheet 11 can be placed on the first left loading surface 71a of the left holding platform 73 or removed from the first left loading surface 71a without air suction.

[0143] The first right loading surface 61a and the first left loading surface 71a may be on the same plane, or one of them may be slightly lower than the other. Fig. 9 As shown, the first right placement surface 61a and the first left placement surface 71a are on the same plane and are horizontal.

[0144] A space S is provided between the first right work table 61 (right work table 6) and the first left work table 71 (left work table 7). The space S is a space defined by the side surface of the first right work table 61 (right work table 6) and the side surface of the first left work table 71 (left work table 7).

[0145] The space portion S is a space that does not hinder the peripheral region 11C from bending into a concave arc shape and accommodates the peripheral region 11C bent into a concave arc shape. In other words, the space portion S is a space that allows the peripheral region 11C to bend into a concave arc shape.

[0146] The width of the space S can be appropriately adjusted by moving the right holding stage 63 and the left holding stage 73 to the right and left in the second direction. The width of the space S refers to the length of the space S in the second direction.

[0147] The breaking auxiliary tool 8 is a component that triggers breaking when the sheet material 11 is broken along the easy breaking line 4 .

[0148] The breaking assisting tool 8 includes a front end portion 81 with which the stretched peripheral region 11C comes into contact, and a main body portion 82 provided with the front end portion 81 .

[0149] The disconnection aid 8 is a straight line in a plan view extending in the first direction. The length of the disconnection aid 8 in the first direction may be slightly shorter than the length of the sheet 11 in the first direction, but is preferably substantially equal to or slightly longer than the length of the sheet 11 in the first direction. In the example shown in the figure, the length of the disconnection aid 8 in the first direction is slightly longer than the length of the sheet 11 in the first direction.

[0150] The main body 82 is composed of, for example, a plate-like body extending in the first direction, and a front end portion 81 is provided at an end of the plate-like body. The main body 82 is formed of a hard material such as metal or hard plastic.

[0151] The front end portion 81 may also be formed of a hard material such as metal or hard plastic. In order to prevent damage to the peripheral area 11C of the sheet 11, it is preferred that the front end portion 81 is formed of an elastic material such as rubber. For example, the front end portion 81 is formed of synthetic rubber such as butadiene rubber (BR), isoprene rubber (IR), chloroprene (CR), natural rubber (NR), copolymer rubber such as styrene-butadiene rubber (SBR), butyl rubber (IIR), olefin elastomer, styrene elastomer such as styrene-butadiene styrene elastomer (SBS), polyurethane elastomer, ester elastomer, fluorine elastomer, polyamide elastomer, etc.

[0152] The front end portion 81 of the breaking assist tool 8 is preferably formed in an arc shape in a side view, and more preferably formed in a semicircular arc shape in a side view.

[0153] The curvature radius of the arc-shaped front end portion 81 of the cutting auxiliary tool 8 is not particularly limited. In order to be able to well cut the sheet 11, it is preferred that the front end portion 81 is formed into an arc with a curvature radius of 1 mm or more and 10 mm or less when viewed from the side, and in order to further prevent poor cutting, it is more preferred to be formed into an arc with a curvature radius of 1 mm or more and 6 mm or less, and it is further preferred to be formed into a curvature radius of 2 mm or more and 6 mm or less.

[0154] In addition, the disconnection auxiliary tool 8 is arranged corresponding to the space portion S.

[0155] The disconnection aid 8 may be configured so that the vertex 81T of the front end portion 81 is approximately located at the center point of the width direction of the space portion S, or may be configured so that the vertex 81T of the front end portion 81 is located to the right or left of the center point of the width direction of the space portion S. It is preferred that the disconnection aid 8 is configured so that the vertex 81T of the front end portion 81 of the disconnection aid 8 is approximately located at the center point of the width direction of the space portion S. In addition, the vertex 81T of the front end portion 81 refers to the front end of the arc of the front end portion 81 formed in an arc shape when viewed from the side. In the example shown in the figure, the lower end of the front end portion 81 becomes the vertex 81T when viewed from the side. In addition, the vertex 81T of the front end portion 81 is straight when viewed from above.

[0156] In the relationship between the sheet 11 placed on the placement surface and the disconnection aid 8 , the disconnection aid 8 is preferably arranged so that the arc-shaped front end 81 of the disconnection aid 8 overlaps the easy break line 4 of the sheet 11 in a plan view.

[0157] The disconnection auxiliary tool 8 can be moved in parallel in the up and down directions via the moving device 83. Fig. 9 In FIG. 8 , the moving direction of the disconnection auxiliary tool 8 is indicated by a thick arrow.

[0158] The moving device 83 has a driving part 831 and a shaft 832 that moves up and down by the driving part 831. The driving part 831 is fixed to the fixing part 182 of the device, and the end of the shaft 832 is attached to the disconnection auxiliary tool 8. In the example shown in the figure, the shaft 832 of the moving device 83 is attached to the main body 82.

[0159] As the moving device 83, for example, a pneumatic or hydraulic cylinder, a cylinder using a motor, a rack and pinion mechanism, a link mechanism, a cam mechanism, etc. can be used.

[0160] By using the moving device 83, the disconnection auxiliary tool 8 is moved downward in parallel. Fig.11 As shown, the front end 81 of the disconnection auxiliary tool 8 can enter the space portion S. In addition, by using the moving device 83 to move the disconnection auxiliary tool 8 upward in parallel, as shown in FIG. Fig.11As shown by the single-dot chain line, the front end portion 81 of the disconnection auxiliary tool 8 can be withdrawn from the space portion S.

[0161] [Sheet setting process]

[0162] The installation step is a step of bending the peripheral region 11C of the easy breaking line 4 in the sheet 11 into a concave arc shape when viewed from the side, and arranging the front end portion 81 of the breaking aid 8 in the concave portion of the concave arc-shaped peripheral region 11C.

[0163] Here, in the severing method of the present invention, the sheet 11 to be severed is conceptually divided into three areas during the description. The peripheral area 11C of the easy-to-break line 4 in the sheet 11 refers to an area bent into a concave arc shape immediately before severing. In addition, the right side area in the sheet 11 refers to an area on the right side of the peripheral area 11C in the second direction. The left side area in the sheet 11 refers to an area on the left side of the peripheral area 11C in the second direction. The "right side area" in the sheet 11 is referred to as the "right side area 11R", and the "left side area" in the sheet 11 is referred to as the "left side area 11L".

[0164] like Fig.13 As shown in (a), in a state where the front end portion 81 of the breaking aid 8 is withdrawn from the space portion S, the right region 11R of the sheet 11 is placed on the placement surface (the first right placement surface 61a and the second right placement surface 62a) of the right workbench portion 6 and the left region 11L of the sheet 11 is placed on the placement surface (the first left placement surface 71a and the second left placement surface 72a) of the left workbench portion 7. At this time, it is preferred that the sheet 11 is placed on the placement surface so that the easy breaking line 4 of the sheet 11 is located below the front end portion 81 of the breaking aid 8. For example, in a case where the vertex 81T of the front end portion 81 of the breaking aid 8 is located at the center point in the width direction of the space portion S, the sheet 11 is placed on the placement surface so that the easy breaking line 4 of the sheet 11 is approximately located at the center point in the width direction of the space portion S. In this way, it is relatively easy to arrange the arc-shaped front end portion 81 of the breaking aid 8 so as to overlap the easy breaking line 4 when viewed from above.

[0165] In addition, the sheet 11 is placed on the placement surface so that the side on which the easy-to-break line 4 is formed faces the placement surface. In other words, the sheet 11 is placed on the placement surface so that the non-formation side of the sheet 11 faces the front end portion 81 side of the breaking auxiliary tool 8. In addition, when the sheets 12 and 13 of the second and third examples are used as the breaking object instead of the sheet 11, one side and the opposite side of these sheets 12 and 13 are both the formation side, so either side may be placed on the placement surface.

[0166] The right holding table 63 holds the right region 11R of the sheet 11, and the left holding table 73 holds the left region 11L of the sheet 11 by sucking air. The suction pressure of the air is not particularly limited as long as the sheet 11 can be sucked and held, and is, for example, 0.1 MPa or more, preferably 0.15 MPa or more.

[0167] In the holding state, as shown by the hollow thick arrow in (a) of the figure, the right holding platform 63 is moved parallel to the left side of the second direction and the left holding platform 73 is moved parallel to the right side of the second direction. That is, the right holding platform 63 and the left holding platform 73 are moved closer to each other so that the interval (the width of the space S) between the right holding platform 63 and the left holding platform 73 becomes smaller. By moving the right holding platform 63 and the left holding platform 73 of the holding sheet 11 parallel to each other, as shown in (b) of the figure, the peripheral area 11C of the soft sheet 11 that is not held is bent into a concave arc shape when viewed from the side.

[0168] In detail, by moving the right holding platform 63 and the left holding platform 73 closer to each other and in parallel, the peripheral area 11C is pressed from both sides and cannot maintain a flat state. Due to the weight of the peripheral area 11C, the peripheral area 11C is deformed into a concave arc shape that is open upward. Since the space portion S is provided in the breaking device 100, there is no obstacle to the peripheral area 11C being bent into a concave arc shape. Therefore, as shown in (b) of the figure, the peripheral area 11C bent into a concave arc shape enters the space portion S when viewed from the side.

[0169] The sheet 11 is preferably arranged so that the easy breaking line 4 of the peripheral region 11C bent into a concave arc shape in a side view overlaps the arc-shaped front end portion 81 of the breaking auxiliary tool 8 in a plan view.

[0170] For example, by moving the right holding platform 63 and the left holding platform 73 by the same amount (by making the moving lengths of the right holding platform 63 and the left holding platform 73 the same), the easy-to-break line 4 is positioned at the approximate center point in the width direction of the concave arc. Therefore, when the vertex 81T of the front end portion 81 of the disconnection assisting tool 8 is disposed approximately at the center point in the width direction of the space portion S, the easy-to-break line 4 of the peripheral region 11C bent into the concave arc shape in a side view overlaps with the front end portion 81 of the disconnection assisting tool 8 in a top view.

[0171] Alternatively, instead of bending the peripheral region 11C into a concave arc shape when viewed from the side by moving the right holding platform 63 and the left holding platform 73, the following method may be used. Fig.13As in (a), the right side region 11R of the sheet 11 is placed on the placing surfaces 61a, 62a of the right table 6, and the left side region 11L of the sheet 11 is placed on the placing surfaces 71a, 72a of the left table 7. Then, the peripheral region 11C may be bent into a concave arc shape by pressing the peripheral region 11C toward the space portion S with a fingertip, and then air may be sucked to hold the right side region 11R and the left side region 11L by the right holding table 63 and the left holding table 73.

[0172] Fig.14 The state in which the front end portion 81 of the disconnection assisting tool 8 is arranged in the concave portion of the peripheral region 11C bent in the concave arc shape is shown.

[0173] Reference Fig.14 The width W1 of the peripheral region 11C deformed into a concave arc shape is not particularly limited, but is, for example, 20 mm to 70 mm, preferably 25 mm to 65 mm. The width W1 of the peripheral region 11C refers to the length in the second direction of the peripheral region 11C bent into a concave arc shape. In the example shown in the figure, the width W1 of the peripheral region 11C is substantially equal to the width of the space portion S. However, the width W1 is sometimes smaller than the width of the space portion S.

[0174] In addition, refer to Fig.14 In the enlarged view, the deflection amount H1 of the peripheral area 11C deformed into a concave arc shape is not particularly limited. However, if the deflection amount H1 of the peripheral area 11C is too small, the concave arc shape will not be formed substantially. If it is too large, the sheet 11 cannot withstand the bending stress, and there is a risk that the sheet 11 will break at a position deviating from the easy break line 4. From this point of view, the deflection amount H1 of the peripheral area 11C deformed into a concave arc shape is greater than 2 mm and less than 35 mm. From the viewpoint of being able to further prevent poor breaking, it is preferably greater than 3 mm and less than 20 mm, and more preferably greater than 5 mm and less than 15 mm. The deflection amount H1 refers to the distance (length in the up and down direction) between the surface of the concave bottom of the concave arc-shaped peripheral area 11C and the surface of the right area 11R.

[0175] After the peripheral area 11C is bent into a concave arc shape, the right area 11R and the left area 11L are held by the right holding platform 63 and the left holding platform 73, as shown in FIG. Fig.13 As shown by the thick arrow in (a), the moving device 83 is operated to move the breaking auxiliary tool 8 downward, and the front end portion 81 is arranged in the concave portion of the peripheral area 11C (see Fig.14 ).

[0176] The tip 81 of the disconnection aid 8 is inserted into the concave portion of the peripheral region 11C so that the vertex 81T of the tip 81 is located below the surface of the right region 11R. The amount H2 of entry of the tip 81 of the disconnection aid 8 is not particularly limited, and is, for example, greater than 0 mm and less than 30 mm, preferably greater than 2 mm and less than 19 mm, and more preferably greater than 4 mm and less than 14 mm. The entry amount H2 refers to the distance (length in the vertical direction) between the tip 81 that enters the concave arc-shaped peripheral region 11C and the surface of the right region 11R.

[0177] Although not specifically shown in the figure, the disconnection aid 8 may be inserted into the recess until the front end 81 of the disconnection aid 8 contacts the surface of the concave arc-shaped peripheral region 11C. However, in this case, it is necessary to avoid applying stress to the concave arc-shaped peripheral region 11C due to excessive insertion of the disconnection aid 8, thereby preventing the peripheral region 11C from being accidentally broken. From this point of view, it is preferred that the front end 81 of the disconnection aid 8 is arranged in the recess of the peripheral region 11C to such an extent that the front end 81 of the disconnection aid 8 does not contact the surface of the concave arc-shaped peripheral region 11C.

[0178] In the example shown in the figure, the front end portion 81 of the disconnection auxiliary device 8 is arranged in the recess of the peripheral area 11C in such a manner that the front end portion 81 of the disconnection auxiliary device 8 does not contact the surface of the concave arc-shaped peripheral area 11C. In this case, the interval H3 between the front end portion 81 of the disconnection auxiliary device 8 and the surface of the concave bottom of the concave arc-shaped peripheral area 11C is not particularly limited, but if it is too large, there is a risk that it is difficult to align the position of the front end portion 81 of the disconnection auxiliary device 8 with respect to the easy breaking line 4. From this point of view, the interval H3 is, for example, greater than 0 mm and less than 10 mm, and from the viewpoint of being able to further prevent poor disconnection, it is preferably greater than 1 mm and less than 5 mm. In addition, the case where the interval H3 is 0 mm makes the front end portion 81 of the disconnection auxiliary device 8 contact the surface of the concave arc-shaped peripheral area 11C.

[0179] The cutting auxiliary tool 8 disposed in the recessed portion remains in this position until the cutting of the sheet 11 is completed.

[0180] [Sheet cutting process]

[0181] The breaking step is a step of applying a tensile force in the second direction to the concavely curved peripheral region 11C to return the concavely curved peripheral region 11C to the front end portion 81 of the breaking aid 8. The sheet 11 is broken along the easy breaking line 4 by this step.

[0182] exist Fig.14In the state shown, the peripheral region 11C is stretched to the right in the second direction and / or to the left in the second direction.

[0183] Specifically, as shown by the hollow thick arrow in the figure, the right holding platform 63 of the right side area 11R of the holding sheet 11 is moved parallel to the right side in the second direction, and the left holding platform 73 holding the left side area 11L is moved parallel to the left side in the second direction. That is, the right holding platform 63 and the left holding platform 73 are moved in opposite directions so that the interval between the right holding platform 63 and the left holding platform 73 becomes larger. Therefore, the right side area 11R held by the right holding platform 63 and the left side area 11L held by the left holding platform 73 are stretched in opposite directions, so that the peripheral area 11C connected to the right side area 11R and the left side area 11L is stretched to the right and left sides in the second direction. If a tensile force is applied to the peripheral area 11C bent into an arc shape along the second direction, the concave arc-shaped peripheral area 11C returns to a flat state. The front end portion 81 of the disconnection auxiliary device 8 is arranged in the concave portion of the concave arc-shaped peripheral area 11C, so, as Fig.15 As shown, the peripheral region 11C abuts against the front end portion 81 of the disconnection assist tool 8 while returning to the flat state, and further, the peripheral region 11C is pressed against the front end portion 81 of the disconnection assist tool 8 .

[0184] The stretching speeds of the right region 11R and the left region 11L (the moving speeds of the right holding table 63 and the left holding table 73 ) are not particularly limited, and the two may be equal speeds or one may be faster than the other.

[0185] By stretching the right region 11R and the left region 11L at the same stretching speed (equal speed) at the same time, when the peripheral region 11C returns from the concave arc shape to the flat state, the fragile line 4 does not deviate to the right or left but shifts upward as it is. By stretching at the same speed at the same time, when the peripheral region 11C abuts against the front end 81 of the disconnection auxiliary tool 8, the front end 81 of the disconnection auxiliary tool 8 overlaps with the fragile line 4 when viewed from above. The overlap when viewed from above refers to a state in which the fragile line 4 is located approximately directly below the front end 81 of the disconnection auxiliary tool 8 formed in the shape of an arc (in other words, it refers to a state in which the fragile line 4 is hidden and cannot be seen by the arc-shaped front end 81 having the curvature radius when viewed from above). The peripheral region 11C is abutted against the front end 81 of the disconnection auxiliary tool 8 in such a way that the front end 81 of the disconnection auxiliary tool 8 overlaps with the fragile line 4 when viewed from above, so that the sheet 11 can be well disconnected along the fragile line 4. In the example shown in the figure, the tip 81 of the breaking aid 8 is arranged so that the vertex 81T of the tip 81 of the breaking aid 8 overlaps with the easy breaking line 4 in a plan view. However, it is not limited to the case where the vertex 81T of the tip 81 overlaps with the easy breaking line 4, as long as the arc-shaped tip 81 having the above-mentioned curvature radius overlaps with the easy breaking line 4.

[0186] The specific stretching speeds of the right region 11R and the left region 11L are not particularly limited, and are each independently, for example, 5 mm / sec to 50 mm / sec, preferably 7 mm / sec to 40 mm / sec, and more preferably 10 mm / sec to 20 mm / sec.

[0187] If the peripheral region 11C stretched in the second direction is strongly pressed against the front end portion 81 of the breaking auxiliary tool 8, Fig.16 As shown, the sheet 11 is cut along the easy-to-break line 4 to produce two divided pieces 111, 112. After the sheet 11 is cut into the two divided pieces 111, 112, the divided pieces 111, 112 can be removed from the right table 6 and the left table 7 by releasing the air suction.

[0188] By using the cutting method and the cutting device of the present invention, it is possible to prevent cracks from being generated on the dividing surface or to prevent the sheet from being cut away from the easy breaking line.

[0189] The mechanism by which the sheet having the brittle material layer can be separated along the easy break line while preventing the failure of segmentation is not clearly understood, but is presumed to be as follows.

[0190] If the peripheral area 11C abuts against the front end portion 81 of the breaking auxiliary tool 8 by the tensile force and is further pressed thereto, Fig.15As shown in the enlarged view of , the concave bottom side of the concave arc-shaped peripheral area 11C is compressed toward the front end portion 81 side of the breaking auxiliary device 8 (the compression direction is indicated by a thin arrow), and the side of the peripheral area 11C opposite to the concave bottom is stretched to the right and left in the second direction (the stretching direction is indicated by a thin dotted arrow). In particular, the front end portion 81 is formed in an arc shape when viewed from the side, so that a roughly uniform bending stress can be applied to the vicinity of the easy-to-break line 4. With the easy-to-break line 4 as a reference, the concave bottom side of the peripheral area 11C is compressed and the opposite side is expanded, so that the sheet 11 abutting against the front end portion 81 of the breaking auxiliary device 8 will be quickly cut at the easy-to-break line 4. Moreover, by applying a tensile force to the sheet 11, the split pieces 111 and 112 are separated while being cut.

[0191] Therefore, it is estimated that cracks are unlikely to occur, and the sheet 11 is unlikely to be cut away from the easy breaking line, and the sheet 11 can be well divided along the easy breaking line 4 .

[0192] The second embodiment of the present invention is described below, but in the description, the structure and effects different from the above-mentioned embodiment are mainly described, and the same structure, etc. are quoted as words or figure marks, and the description of the structure is sometimes omitted (the same applies to the third embodiment and thereafter).

[0193] (Second embodiment)

[0194] In the second embodiment, the sheet to be cut has a brittle material layer and a resin layer laminated on the brittle material layer. The resin layer has the bonding layer and the resin film layer described in the first embodiment.

[0195] The brittle material layer is provided with an easy-to-break line extending in a first direction. The resin layer is provided with a defective portion of the resin material where the resin layer is not present. The defective portion where the resin layer is not present overlaps with the easy-to-break line and extends in the first direction (i.e., the direction in which the easy-to-break line extends).

[0196] Fig.17 as well as Fig.18 A fourth example of the sheet 14 before being cut, which has the brittle material layer 2 and the resin layer 3 , is shown.

[0197] Fig.17 as well as Fig.18 The sheet material 14 of the fourth example shown has a brittle material layer 2 and a resin layer 3 having a resin film layer 31 and a bonding layer 32. One surface of the brittle material layer 2 and the resin film layer 31 are bonded via a bonding layer 32 composed of an adhesive or the like.

[0198] A groove 41 (fragile line 4) extending in the first direction is formed on one surface of the brittle material layer 2. The groove 41 (fragile line 4) extends from an edge of the brittle material layer 2 on one side in the first direction to an edge on the opposite side in the first direction.

[0199] A defective portion 45 is formed in the surface of the resin layer 3. The defective portion 45 is formed at a position overlapping the groove 41 (fracture-prone line 4) in the thickness direction. Therefore, when viewed from one side, the resin layer 3 does not cover the groove 41, and the groove 41 is open (open) on one side. In the example shown in the figure, the top view shape of the defective portion 45 is substantially the same as the top view shape of the groove 41. In addition, the width of the defective portion 45 is substantially the same as or slightly larger than the width of the groove 41.

[0200] In the sheet 14 of the fourth example, one surface side of the brittle material layer 2 is a formed side, and the opposite surface side is a non-formed side.

[0201] Fig.19 The sheet material 15 of the fifth example before being cut is shown. Fig.19 The sheet material 15 of the fifth example shown is the same as the sheet material 14 of the fourth example except that a groove 42 (fracture line 4) is formed on the opposite surface of the brittle material layer 2. In the sheet material 15 of the fifth example, the opposite surface side of the brittle material layer 2 is the formation side, and one side thereof is the non-formation side. In this case, the groove 42 is open on the opposite surface side.

[0202] Fig. 20 The sheet material 16 of the sixth example before being cut is shown. Fig. 20 The sheet material 16 of the sixth example shown is the same as the sheet material 14 of the fourth example except that a groove 41 (fracture line 4) is formed on one side of the brittle material layer 2 and a groove 42 (fracture line 4) is formed on the opposite side of the brittle material layer 2. In the sheet material 16 of the sixth example, both the one side and the opposite side of the brittle material layer 2 are formed sides.

[0203] Although not particularly shown in the drawings, perforations may be used as the easy breaking lines 4 instead of the grooves of the sheets 14 , 15 , and 16 in the fourth to sixth examples.

[0204] The sheets 14 , 15 , and 16 including the brittle material layer 2 having the easy break line 4 formed therein and the resin layer 3 having the defective portion 45 formed therein as in the second embodiment are obtained as follows.

[0205] The composite material 10 having the groove 41 (and the groove 42 as required) formed therein is obtained in the same manner as described in the columns of <Composite Material> and <Formation of the Easy Breaking Line (Groove)> of the [Preparation Step of Sheet Material Having Easy Breaking Line Formed] of the first embodiment described above. Next, the resin layer 3 is not peeled off from the composite material 10, but a defective portion 45 is formed in the resin layer 3, thereby making it possible to produce the sheet material of the second embodiment.

[0206] The method of forming the defective portion 45 in the resin layer 3 is not particularly limited, but a method of removing a portion of the resin layer 3 using a laser beam may be mentioned. Fig.21 As shown, the laser beam C2 oscillated from the laser light source 53 is irradiated to the resin layer 3 along the predetermined separation line DL of the composite material 10 to remove the resin. As the laser light source 53, for example, a CO2 laser light source can be used, which oscillates and generates a laser beam C2 with a wavelength of 9 μm or more and 11 μm or less in the infrared region. The oscillation mode of the CO2 laser light source 53 can be pulse oscillation or continuous oscillation. The spatial intensity distribution of the laser beam C2 can be a Gaussian distribution, and in order to suppress damage to the brittle material layer 2 that is not the object of removal of the laser beam C2, it can also be shaped into a flat top distribution using a diffraction optical element (not shown) or the like. The polarization state of the laser beam C2 is not limited, and it can also be any of linear polarization, circular polarization, and random polarization. By irradiating the resin layer 3 (resin film layer 31 and bonding layer 32 such as adhesive) with the laser beam C2 along the predetermined separation line DL of the composite material 10, the resin irradiated with the laser beam C2 absorbs infrared light, and a local temperature rise occurs, and the resin is scattered. As a result, a defect portion 45 along the predetermined separation line DL is formed.

[0207] The sheet material of the second embodiment can also be divided into two divided pieces using the dividing device 100, similarly to the sheet material of the first embodiment.

[0208] Fig. 22 The following illustrates the case where the sheet 14 of the fourth example is cut. Fig. 22 As shown, the sheet 14 of the second embodiment is placed on the loading surface of the breaking device 100, so that the peripheral area 14C is bent into a concave arc shape. In addition, the sheet 14 has its forming side facing the loading surface. The front end portion 81 of the breaking auxiliary tool 8 is arranged in the concave portion of the peripheral area 14C bent into a concave arc shape. Moreover, as in the first embodiment, a tensile force is applied to the peripheral area 14C in the second direction, so that the sheet 14 can be well broken along the easy breaking line 4.

[0209] (Third Embodiment)

[0210] In the breaking device 100 of the first embodiment, the first right workbench 61 is arranged on the left side of the second right workbench 62 and the first left workbench 71 is arranged on the right side of the second left workbench 72. Fig.23 As in the breaking device 101 shown in the figure, the first right table section 61 is arranged on the right side of the second right table section 62 and the first left table section 71 is arranged on the left side of the second left table section 72.

[0211] In this case, a space portion S is provided between the second right table portion 62 of the right table portion 6 and the second left table portion 72 of the left table portion 7. That is, the space portion S in this case is a space divided by the side surface of the second right table portion 62 and the side surface of the second left table portion 72. In addition, the second right table portion 62 and the second left table portion 72 are fixed to the fixing portion 180 of the device, so the width of the space portion S of the breaking device 101 of the third embodiment is constant.

[0212] (Fourth Embodiment)

[0213] In the first embodiment of the breaking device 100, the right workbench 6 includes a first right workbench 61 and a second right workbench 62, and the left workbench 7 includes a first left workbench 71 and a second left workbench 72. Fig.24 As shown in the cutting device 102, the right table portion 6 is composed of the first right table portion 61 and the left table portion 7 is composed of the first left table portion 71. In this embodiment, the first right table portion 61 and the first left table portion 71 also have a stretching mechanism. That is, the first right table portion 61 and the first left table portion 71 are the same as the first embodiment, and become a stretching mechanism that also serves as a loading table for loading sheets.

[0214] (Fifth Embodiment)

[0215] The breaking device 100 of the first embodiment is that the stretching mechanism portion is composed of the right holding table portion 63 and the left holding table portion 73 for sucking and holding the sheet and the right advance and retreat device 64 and the left advance and retreat device 74 for moving it, but it can also be as follows Fig.25 As shown in the breaking device 103, the stretching mechanism portion is composed of a right conveying roller 68 provided on the right worktable portion 6 side and a left conveying roller 78 provided on the left worktable portion 7 side.

[0216] The right transport roller 68 is constituted by, for example, a pair of rollers. The right region 11R of the sheet 11 is sandwiched between the pair of rollers, and the right region 11R of the sheet 11 can be parallel-moved to the right in the second direction by rotating the rollers.

[0217] The left transport roller 78 is constituted by, for example, a pair of rollers, and can similarly move the left region 11L of the sheet 11 in parallel to the left in the second direction.

[0218] (Other Implementations)

[0219] In the above embodiment, the sheet is held by the right and left holding tables using air suction, but the sheet may be held by the right and left holding tables via an adhesive having relatively weak adhesion instead of or in combination with air suction (not shown).

[0220] In addition, in the above-mentioned embodiment, the right area of ​​the sheet is stretched to the right in the second direction and the left area of ​​the sheet is stretched to the left in the second direction, so that the peripheral area is pulled to the right and left in the second direction, but the present invention is not limited thereto. For example, the left area may be fixed and the right area may be stretched to the right in the second direction, so that the tensile force is applied only to the right in the second direction to the peripheral area, or the right area may be fixed and the left area may be stretched to the left in the second direction, so that the tensile force is applied only to the left in the second direction to the peripheral area.

[0221] In addition, as the stretching mechanism of the above-mentioned separating device, a method of parallel movement of the right holding table and the left holding table for holding the sheet and a method of using a conveying roller are exemplified, but the stretching mechanism is not limited to these. As long as a stretching force can be applied to the peripheral area bent into a concave arc shape to the right and / or left side in the second direction, a stretching mechanism of various structures can be adopted.

[0222] [Example]

[0223] The present invention will be described in more detail below with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

[0224] [Sheet]

[0225] In the examples and comparative examples, the following soft glass plates were used as sheets to be cut.

[0226] Three types of soft alkali-free glass plates having a square shape with a side of 200 mm in plan view and different thicknesses (thickness 30 μm, thickness 50 μm, thickness 100 μm) were prepared.

[0227] A groove (easy-to-break line) having a depth of 2 μm was linearly formed in the center portion of one surface of each of the alkali-free glass plates.

[0228] [Example 1]

[0229] Trial production Figures 9 to 12 The breaking device 100 is shown.

[0230] The front end portion 81 of the breaking auxiliary tool 8 of the breaking device 100 is made of aluminum, and the shape of the front end portion 81 is formed into a semicircular arc shape with a curvature radius of 3 mm in side view.

[0231] A 30 μm thick alkali-free glass plate is placed on the mounting table of the cutting device as a sheet. Fig.14 As shown, after the peripheral area 11C is bent into a concave arc shape, the right area 11R and the left area 11L are held by suction using the right holding platform 63 and the left holding platform 73 (air suction pressure: 0.2 MPa). At this time, the peripheral area 11C is bent in such a way that the groove 41 is located approximately directly below the vertex 81T of the front end portion 81 of the breaking auxiliary tool 8. In the state where the peripheral area 11C is bent, the groove 41 of the glass plate is located approximately directly below the vertex 81T of the front end portion 81 of the breaking auxiliary tool 8 (that is, the vertex of the front end portion 81 of the breaking auxiliary tool 8 and the groove 41 of the glass plate are approximately overlapped when viewed from above).

[0232] Next, the breaking assist tool 8 is lowered, and its front end portion 81 is arranged in the concave portion of the concave arc-shaped peripheral region 11C.

[0233] The width W1 of the peripheral region 11C bent into a concave arc shape is set to 56 mm, and the bending amount H1 of the peripheral region 11C deformed into a concave arc shape is set to 11 mm. In addition, the disconnection auxiliary tool 8 is lowered so that the entry amount H2 of the front end portion 81 of the disconnection auxiliary tool 8 becomes 10 mm. Therefore, the distance H3 between the front end portion 81 of the disconnection auxiliary tool 8 and the surface of the concave bottom of the concave arc-shaped peripheral region 11C is 1 mm.

[0234] Next, the right holding platform 63 and the left holding platform 73 are moved without moving the separation auxiliary tool 8 arranged at a predetermined position in the recess, and the right area 11R is stretched to the right and the left area 11L is stretched to the left at the same time. By the stretching, a tensile force is applied to both sides of the peripheral area 11C in opposite directions, so that the peripheral area 11C is returned to the front end 81 side of the separation auxiliary tool 8, and the peripheral area 11C is abutted against the front end 81 to separate the glass plate. By the separation, a split piece (the glass plate is separated into two pieces) is obtained from the glass plate. In addition, the stretching speed of the right area 11R and the left area 11L is set to 10 mm / s.

[0235] In order to confirm whether the split was consistent with the groove or deviated from the groove, the split surface of the split piece was observed by visual observation. In addition, in order to confirm the presence or absence of cracks, the split surface was magnified 100 times for observation. Similarly, a total of 10 glass plates were split and the visual observation and magnified observation were performed. The results are shown in Table 1.

[0236] "○" in the column of "Separation Deviation" in Table 1 indicates that 9 or more glass plates out of 10 were separated in accordance with the groove, and "△" indicates that 5 or more and 8 or less glass plates out of 10 were separated in accordance with the groove.

[0237] In the column of cracks in Table 1, "○" indicates that 9 or more of the 10 glass plate segments have no cracks, "△" indicates that 5 or more and 8 or less of the 10 glass plate segments have no cracks, and "×" indicates that all of the glass plate segments have cracks.

[0238]

Table 1

[0239]

[0240] [Example 2]

[0241] Ten glass plates were cut in the same manner as in Example 1 except that the semicircular shape of the front end portion 81 of the cutting auxiliary tool 8 was changed to a curvature radius shown in Table 1, and the states of the cut pieces were visually observed and magnified.

[0242] [Example 3]

[0243] Ten glass plates were cut in the same manner as in Example 1 except that the semicircular shape of the front end portion 81 of the cutting auxiliary tool 8 was changed to a curvature radius shown in Table 1, and the states of the cut pieces were visually observed and magnified.

[0244] [Examples 4 and 5]

[0245] Except that the bending amount H1 of the peripheral area 11C of the glass plate and the penetration amount H2 of the front end portion 81 of the cutting auxiliary tool were changed as shown in Table 1, 10 glass plates were cut in the same manner as in Example 1, and the states of the cut pieces were visually observed and magnified. The results are shown in Table 1.

[0246] [Examples 6 and 7]

[0247] Except that the stretching speeds in the right region 11R and the left region 11L were changed as shown in Table 1, 10 glass plates were cut in the same manner as in Example 1, and the states of the cut pieces were visually observed and magnified.

[0248] [Examples 8 and 9]

[0249] Except that the entry amount H2 of the front end portion 81 of the cutting auxiliary tool was changed as shown in Table 1 (therefore, the interval H3 was changed as shown in Table 1), 10 glass plates were cut in the same manner as in Example 1, and the states of the cut pieces were visually observed and magnified. The results are shown in Table 1.

[0250] [Example 10]

[0251] Ten glass plates were cut in the same manner as in Example 1 except that glass plates having thicknesses shown in Table 1 were used, and the states of the cut pieces were visually observed and observed under magnification.

[0252] [Example 11]

[0253] Except that a glass plate having a thickness shown in Table 1 was used and the bending amount H1 of the peripheral region 11C of the glass plate and the penetration amount H2 of the front end portion 81 of the cutting auxiliary tool were changed as shown in Table 1, 10 glass plates were cut in the same manner as in Example 1, and the states of the cut pieces were visually observed and magnified. The results are shown in Table 1.

[0254] [Comparative Example 1]

[0255] In Comparative Example 1, the glass sheet is cut by lowering the cutting auxiliary tool without stretching the right region 11R and the left region 11L.

[0256] Specifically, in Comparative Example 1, the same dividing device 100 as that of Example 1 was used. On the placing table of the dividing device, a 30 μm thick non-alkali glass plate was placed as a sheet. Fig.14 After the peripheral area 11C is bent into a concave arc shape as shown, the right area 11R and the left area 11L are held by suction using the right holding platform 63 and the left holding platform 73 (air suction pressure: 0.2 MPa). In the state where the peripheral area 11C is bent, the groove of the glass plate is located approximately directly below the vertex 81T of the front end portion 81 of the breaking auxiliary tool 8. The width W1 of the peripheral area 11C bent into a concave arc shape is 56 mm (the same as in Example 1), and the bending amount H1 of the peripheral area 11C deformed into a concave arc shape is set to 11 mm (the same as in Example 1).

[0257] Next, the cutting auxiliary tool 8 was lowered at a speed of about 5 mm / s, and the groove of the glass sheet was pressed by the front end portion 81 of the cutting auxiliary tool 8, thereby cutting the glass sheet.

[0258] Regarding Comparative Example 1, a total of 10 glass plates were cut and visually observed and observed under magnification in the same manner as in Example 1. The results are shown in Table 1.

[0259] [evaluate]

[0260] When the glass sheet is broken by stretching the right region 11R and the left region 11L of the glass sheet and returning the concave arc-shaped peripheral region to the breaking auxiliary tool side as in Examples 1 to 11, breaking failure is unlikely to occur.

[0261] On the other hand, as in Comparative Example 1, when the glass sheet was separated by pressing the glass sheet with the separation auxiliary tool without applying a tensile force to the right region 11R and the left region 11L of the glass sheet, cracks were generated.

[0262] Description of Reference Numerals

[0263] 11, 12, 13, 14, 15, 16 Sheet

[0264] 11C, 14C sheet surrounding area

[0265] 11R Right side area of ​​the sheet

[0266] 11L Left area of ​​the sheet

[0267] 2 Brittle material layer

[0268] 4, 41, 42, 43 Breaking line

[0269] 6 Right workbench

[0270] 63 Right holding table (stretching mechanism)

[0271] 7 Left workbench

[0272] 73 Left holding table (stretching mechanism)

[0273] 8 Disconnection aids

[0274] 81 Front end of disconnecting aid

[0275] 100, 101, 102, 103 breaking device

Claims

1. A method for cutting a sheet, characterized in that: have: A preparation step of preparing a soft sheet having a brittle material layer formed with an easy-to-break line extending in a first direction; A setting step is to make the peripheral area of ​​the easy-to-break line in the sheet bend into a concave arc shape when viewed from the side, and arrange the front end of the breaking auxiliary tool in the concave part of the concave arc-shaped peripheral area; as well as In the breaking step, a tensile force is applied to the peripheral area along a second direction orthogonal to the first direction, so that the concave arc-shaped peripheral area returns to the front end side of the breaking auxiliary device and the sheet is broken along the easy breaking line.

2. The sheet cutting method according to claim 1, characterized in that: The front end portion of the breaking assist tool is formed in an arc shape with a curvature radius of not less than 1 mm and not more than 6 mm in a side view.

3. The sheet cutting method according to claim 2, characterized in that: In the setting step, the arc-shaped front end portion of the breaking assist tool is a straight line extending in the first direction in a plan view, and the front end portion of the breaking assist tool is arranged so as to overlap with the easy breaking line in a plan view.

4. The sheet cutting method according to claim 1 or 2, characterized in that: In the cutting process, the area on the right side of the second direction and the area on the left side of the second direction of the sheet are respectively maintained, and the area on the right side and the area on the left side are stretched in opposite directions, thereby applying a tensile force to the peripheral area along the second direction.

5. The sheet cutting method according to claim 4, characterized in that: The area on the right and the area on the left are stretched at the same speed.

6. The sheet material cutting method according to claim 5, characterized in that: The stretching speed of the right region and the left region is 5 mm / sec or more and 50 mm / sec or less.

7. The sheet cutting method according to claim 1 or 2, characterized in that: In the setting step, the deflection amount of the peripheral area is greater than or equal to 2 mm and less than or equal to 20 mm.

8. The sheet cutting method according to claim 1 or 2, characterized in that: The brittle material layer is glass having a thickness of 20 μm or more and 120 μm or less.

9. A sheet material cutting device, which cuts a soft sheet material having a brittle material layer formed with an easy-to-break line extending in a first direction along the easy-to-break line, characterized in that: The breaking device comprises: a placing table for placing the sheet; A stretching mechanism that applies a stretching force to a peripheral area of ​​the easy-to-break line in the sheet material in a second direction that is orthogonal to the first direction; as well as A disconnecting aid having a front end, The mounting table includes a right worktable portion arranged on the right side of the second direction and a left worktable portion arranged on the left side of the second direction. Between the right workbench portion and the left workbench portion, a space portion for accommodating the bent peripheral area is provided in order to make the peripheral area bend into a concave arc shape when viewed from the side. The front end portion of the disconnection assist tool can enter the space portion.

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