JP6090325B2 - Composite sheet cutting method, glass sheet cutting method, composite sheet cutting piece - Google Patents

Description

  The present invention relates to a composite sheet cutting method, a glass sheet cutting method, and a composite sheet cut piece.

  A composite sheet including a glass sheet and a resin film formed on the glass sheet is known. This composite sheet has both the chemical resistance and heat resistance of a glass sheet and the flexibility of a resin film, and is used for the production of, for example, a display, a solar cell and the like by utilizing the characteristics.

  In recent years, a method using laser light has been proposed as a method for cutting a composite sheet (see, for example, Patent Document 1).

  As a method for cutting a glass sheet, a method is known in which a glass sheet is locally heated with laser light and cracks are formed in the glass sheet by thermal stress (see, for example, Patent Document 2).

Japan Special Table 2010-501457 Japanese Unexamined Patent Publication No. 2010-90009

  When the thickness of the glass sheet is reduced, cracks formed in the glass sheet penetrate the glass sheet in the thickness direction.

  Then, when the crack was formed, the glass on both sides sandwiching the crack was not connected, so that the glass was easily deformed, and the position of the crack was easily removed from the desired position.

  This invention is made | formed in view of the said subject, Comprising: It aims at provision of the cutting method of a composite sheet with a sufficient cutting precision, and the cutting method of a glass sheet with a good cutting precision.

In order to solve the above problems , according to one aspect of the present invention ,
A method of cutting a composite sheet comprising a glass sheet having a thickness of 200 μm or less and a resin film formed on the glass sheet,
The glass sheet of the composite sheet is locally irradiated with laser light, the glass sheet is locally heated at a temperature below the annealing point of the glass, and the irradiation position of the laser light in the glass sheet is moved, A step of extending a crack penetrating the glass sheet in the thickness direction along the movement trajectory,
In more該工, across the resin film is the crack, the glass of both sides of the crack tuna technique,
Further, in this step, when moving the irradiation position of the laser light on the glass sheet, along the movement trajectory, a linear thermal deterioration portion is formed on the resin film,
Here, the thermal deterioration means that the tensile strength of the resin film after laser irradiation is reduced by 0.01% or more based on the tensile strength (MPa) of the resin film before laser irradiation.
Provided is a composite sheet cutting method in which the resin film is cut after the step.

According to another aspect of the present invention ,
A method for cutting a glass sheet having a thickness of 200 μm or less,
The glass sheet of the composite sheet including the glass sheet and the resin film formed on the glass sheet is locally irradiated with laser light, and the glass sheet is locally heated at a temperature below the annealing point of the glass. The step of moving the irradiation position of the laser light in the glass sheet, and extending a crack penetrating the glass sheet in the thickness direction along the movement locus,
In more該工, across the resin film is the crack, the glass of both sides of the crack tuna technique,
Further, in this step, when moving the irradiation position of the laser light on the glass sheet, along the movement trajectory, a linear thermal deterioration portion is formed on the resin film,
Here, the thermal deterioration means that the tensile strength of the resin film after laser irradiation is reduced by 0.01% or more based on the tensile strength (MPa) of the resin film before laser irradiation.
A glass sheet cutting method is provided in which, after the step, the resin film is bent around the linear heat-deteriorated portion to cut an end portion of the glass sheet that is a terminal portion of the movement locus .

  ADVANTAGE OF THE INVENTION According to this invention, the cutting method of a composite sheet with a sufficient cutting precision and the cutting method of a glass sheet with a high cutting precision are provided.

It is a perspective view which shows the 1st process of the cutting method of the composite sheet by the 1st Embodiment of this invention. It is a perspective view which shows the 2nd process of the cutting method of the composite sheet by the 1st Embodiment of this invention. It is explanatory drawing of the dimension of the laser beam in the laser irradiation surface of the glass sheet of FIG. It is a perspective view which shows the state of the composite sheet after the laser scanning of FIG. It is a perspective view which shows the state of the resin film of FIG. It is a side view which shows the state of a composite sheet when removing from a support stand after the laser scanning of FIG. It is a perspective view which shows the state of the composite sheet after the process of FIG. It is a side view which shows the 3rd process of the cutting method of the composite sheet by the 1st Embodiment of this invention. It is a perspective view which shows the cut piece obtained after the 3rd process of FIG. It is explanatory drawing of the cutting method of the glass sheet by the 2nd Embodiment of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof is omitted.

[First Embodiment]
FIGS. 1-9 is explanatory drawing of the cutting method of the composite sheet by the 1st Embodiment of this invention.

  As shown in FIG. 1, the composite sheet 10 of the present invention includes a glass sheet 12 and a resin film 14 formed on the glass sheet 12. The composite sheet 10 has both the chemical resistance and heat resistance of the glass sheet 12 and the flexibility of the resin film 14, and is used for manufacturing, for example, a display and a solar cell by utilizing the characteristics.

  The glass type of the glass sheet 12 may be various, for example, soda lime glass, non-alkali glass, or the like. Moreover, the shaping | molding method of the glass sheet 12 may be a general thing, for example, the float method, the fusion method, the redraw method, etc. may be sufficient.

The average linear expansion coefficient (hereinafter simply referred to as “average linear expansion coefficient”) of the glass sheet 12 at 0 ° C. to 300 ° C. is, for example, 10 × 10 ⁻⁷ / ° C. to 100 × 10 ⁻⁷ / ° C., preferably 10 × 10. ^{It is −7} / ° C. to 50 × 10 ⁻⁷ / ° C.

  The thickness of the glass sheet 12 is 200 μm or less. When the thickness of the glass sheet 12 is 200 μm or less, it is possible to produce a glass roll by winding the glass sheet 12 in a spiral shape. Further, when the thickness of the glass sheet 12 is 200 μm or less, the crack 31 formed in the glass sheet 12 by the irradiation of the laser light 20 shown in FIG. 2 penetrates the glass sheet 12 in the thickness direction. The thickness of the glass sheet 12 becomes like this. Preferably it is 150 micrometers or less, More preferably, it is 100 micrometers or less, More preferably, it is 50 micrometers or less. Further, the thickness of the glass sheet 12 is preferably 10 μm or more.

  The glass sheet 12 may be subjected to a surface treatment in advance in order to improve the adhesion between the glass and the resin. Examples of the surface treatment include primer treatment, ozone treatment, plasma etching treatment, and the like. An example of the primer is a silane coupling agent. Examples of silane coupling agents include aminosilanes, epoxy silanes, alkoxysilanes, silazanes and the like.

  The method for forming the resin film 14 on the glass sheet 12 is not particularly limited. For example, a liquid resin composition is applied to the glass sheet 12 and the resin composition is solidified, and the resin film is attached to the glass sheet 12. Any of the methods may be used. The resin film may be subjected to a surface treatment in advance in order to enhance the adhesion between the glass and the resin, and for example, may be one in which a pressure-sensitive adhesive is applied to the surface in contact with the glass. In this case, the resin film 14 includes a resin film as a base material and an adhesive. Examples of the pressure-sensitive adhesive include isocyanate-based, polyurethane-based, polyester-based, acrylic-based, polyethyleneimine-based, rubber-based, silane coupling agent, titanium coupling agent, silicone-based, polyimide-silicone-based, and the like.

  The resin film 14 is formed on at least a part of the cutting position of the glass sheet 12 (that is, the movement locus of the irradiation position of the laser beam 20 (see FIG. 2) in the glass sheet 12), and at least at the cutting end position of the glass sheet 12. It is preferably formed, and more preferably formed over the entire cutting position of the glass sheet 12.

  As will be described in detail later, the resin film 14 serves to connect the glasses 121 and 122 on both sides of the crack 31 across the crack 31 formed in the glass sheet 12 by irradiation with the laser beam 20. Therefore, at least a region within 2.5 mm is covered with the resin film 14 in both directions orthogonal to the crack 31 from the crack 31 (that is, the center line of the movement locus of the laser beam irradiation position in the glass sheet 12). Is preferred. Further, it is more preferable that at least a region within 5 mm is covered with the resin film 14 in both directions orthogonal to the crack 31 from the crack 31.

  The resin film 14 may be larger or smaller than the glass sheet 12. It is particularly preferable that the resin film 14 has the same size as the glass sheet 12.

  The resin film 14 may be formed of either a thermoplastic resin or a thermosetting resin, but when the glass sheet 12 is locally heated with the laser beam 20 shown in FIG. 2, the resin film 14 is not torn and cut. Thus, what is formed with a thermosetting resin is preferable. As the thermosetting resin, for example, polyimide (PI), epoxy (EP), or the like is used. Examples of the thermoplastic resin include polyamide (PA), polyamideimide (PAI), polyetheretherketone (PEEK), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), and cyclic polyolefin. (COP), polycarbonate (PC), polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), acrylic (PMMA), urethane (PU) and the like are used. The resin film 14 may be formed of a photocurable resin.

  Further, the resin film 14 may contain an inorganic filler in order to improve heat resistance, strength, moldability, and the like.

  The resin film 14 is preferably formed on one surface of the glass sheet 12, and is formed on the surface opposite to the surface 12a on which the laser light 20 of the glass sheet 12 is incident (hereinafter referred to as the laser irradiation surface 12a of the glass sheet 12). It is preferred that

  The thickness of the resin film 14 depends on the type of the resin film 14, but is, for example, 1 μm to 200 μm, more preferably 1 μm to 100 μm, and still more preferably 1 μm to 50 μm. If the thickness of the resin film 14 becomes too thick, the resin film 14 cannot be cleaved by bending the resin film 14. If the thickness of the resin film 14 becomes too thin, the resin film 14 is torn and cut when the glass sheet 12 is locally heated with the laser beam 20. In addition, when the resin film 14 consists of a base material and an adhesive, the thickness of the resin film 14 is the total thickness of a base material and an adhesive.

  The peel strength of the resin film 14 is measured by a 180 ° peel test (JIS K6854-2) in which the resin film 14 is peeled off from the glass sheet 12 while holding the glass sheet 12 flat. The peel strength of the resin film 14 is, for example, larger than 0 N / 25 mm, preferably 0.01 N / 25 mm or more, more preferably 0 so that the resin film 14 can suppress the deformation of the glass sheet 12 when irradiated with the laser beam 20. .1 N / 25 mm or more.

  The composite sheet cutting method includes, for example, a first step of forming an initial crack 30 in the glass sheet 12 (see FIG. 1) and a second step of forming a crack 31 penetrating the glass sheet 12 in the thickness direction ( 2) and a third step of cutting the resin film 14 (see FIG. 8).

  In the first step, an initial crack 30 is formed in the glass sheet 12 as shown in FIG. The initial crack 30 may be formed at the cutting start position of the glass sheet 12 and may be formed at the end of the glass sheet 12. The initial crack 30 is formed by a wheel cutter, a point cutter, a file, a laser, or the like.

  The first step may be performed before the resin film 14 is formed on the glass sheet 12 or may be performed after the resin film 14 is formed on the glass sheet 12. In the latter case, since the glass sheet 12 is reinforced with the resin film 14 when the initial crack 30 is formed, damage to the glass sheet 12 can be suppressed.

  The first step is an optional step and may be omitted. For example, when the end surface of the glass sheet 12 is ground with a grindstone or the like, microcracks formed by grinding can be used as initial cracks.

  In the second step, as shown in FIG. 2, the glass sheet 12 of the composite sheet 10 is locally irradiated with the laser light 20, and the glass sheet 12 is locally heated at a temperature below the annealing point of the glass, The irradiation position of the laser beam 20 on the glass sheet 12 is moved.

  In order to move the irradiation position of the laser 20 on the glass sheet 12, the glass sheet 12 may be moved, the light source of the laser light 20 may be moved, or both may be moved. The movement of the glass sheet 12 is performed by, for example, movement of a stage that supports the glass sheet 12 or rotation of a conveyance roll that conveys the glass sheet 12. The transport roll is rotated around its center line. Instead of moving the glass sheet 12, the glass sheet 12 may be rotated. The rotation of the glass sheet 12 is performed by rotation of a stage that supports the glass sheet 12. The stage is rotated about a rotating shaft that projects from the stage. The rotation of the glass sheet 12 is particularly effective when the movement locus of the irradiation position of the laser beam 20 on the glass sheet 12 is curved. Further, in order to move the irradiation position of the laser 20 on the glass sheet 12, a galvanometer mirror that reflects the laser light from the light source toward the glass sheet 12 may be rotated.

  By the way, when the glass is heated at a temperature exceeding the annealing point of the glass, the thermal stress is relaxed by the viscous flow of the glass. The heating temperature is preferably as high as possible below the annealing point. That is, the heating temperature range is preferably (glass annealing point -200 ° C) or more and glass annealing point or less, (glass annealing point -100 ° C) or more and glass annealing point or less. .

  In this embodiment, since the glass sheet 12 is locally heated at a temperature below the annealing point of the glass, thermal stress is generated. A compressive stress is generated at the irradiation position of the laser beam 20, and a tensile stress is generated near the rear of the irradiation position of the laser beam 20 due to the reaction. The glass sheet 12 is cut open by the generated tensile stress, and a crack 31 is formed. The crack 31 penetrates the glass sheet 12 in the thickness direction. The crack 31 follows the irradiation position of the laser beam 20 and extends along the movement locus of the irradiation position of the laser beam 20. The movement trajectory may be linear or curved, and may have both a linear portion and a curved portion. The crack 31 may be formed starting from the initial crack 30. Here, “backward” means a direction opposite to the extending direction of the crack 31, and means a direction opposite to the moving direction of the irradiation position of the laser beam 20 on the glass sheet 12.

  In general, when glass is partially melted, it tends to shrink when the melted portion cools and hardens. At this time, thermal contraction of the melted portion is hindered by the peripheral portion, and microcracks are randomly formed.

  In this embodiment, since the glass sheet 12 is locally heated at a temperature below the annealing point of the glass, the glass does not melt. Therefore, a smooth glass cut surface is obtained, and a high-strength glass cut surface is obtained.

  After being emitted from the light source, the laser light 20 is collected by a condenser lens or the like and is incident on the laser irradiation surface 12 a of the glass sheet 12. The laser beam 20 may enter the laser irradiation surface 12a of the glass sheet 12 perpendicularly or may be incident obliquely.

As a light source of the laser light 20, for example, a CO ₂ laser (wavelength 10600 nm), a mid-infrared light parametric oscillator (wavelength 2600 nm to 3450 nm), an Er: YAG laser (wavelength 2940 nm), a Ho: YAG laser (wavelength 2080 nm), a Yb fiber Laser (wavelength 1000 nm to 1100 nm), Yb disk laser (wavelength 1000 nm to 1100 nm), Nd: YAG laser (wavelength 1064 nm), high power semiconductor laser (wavelength 808 nm to 980 nm) green laser (wavelength 532 nm), UV laser (wavelength 355 nm) Etc. are used.

  The light source of the laser light 20 may be either a CW laser that continuously oscillates the laser light or a pulse laser that intermittently oscillates the laser light.

The shape (spot shape) of the laser light 20 on the laser irradiation surface 12 a of the glass sheet 12 is appropriately set according to the type of the light source of the laser light 20 and the like. This is because the light absorption rate of the glass sheet 12 varies depending on the wavelength of the laser light 20. For example, when the light source is a CO ₂ laser, the wavelength of the laser light 20 is long, and most of the laser light 20 is absorbed as heat near the laser irradiation surface 12 a of the glass sheet 12. Therefore, when the light source is a CO ₂ laser, the shape of the laser beam 20 on the laser irradiation surface 12a of the glass sheet 12 may be elongated in the moving direction of the irradiation position of the laser beam 20. When the irradiation position of the laser beam 20 moves, the cutting position of the glass sheet 12 can be heated for a long time, and a time for transferring heat from the laser irradiation surface 12a of the glass sheet 12 to the inside can be secured. By heating the inside of the glass sheet 12, it is possible to form a crack 31 that penetrates the glass sheet 12 in the thickness direction.

  When the thickness of the glass sheet 12 is 200 μm or less, since the time for transferring heat from the laser irradiation surface 12a of the glass sheet 12 to the inside is short, the shape of the laser light 20 on the laser irradiation surface 12a of the glass sheet 12 is, for example, circular Or a rectangle. In the case of a circle, when the movement locus of the irradiation position of the laser beam 20 includes a curved portion, the width of the curved portion of the movement locus is constant, and the crack 31 is difficult to be removed from the movement locus. In the case of an ellipse or rectangle, in order to make the width of the curved portion of the movement locus constant, the laser light 20 may be rotated around the optical axis while moving the irradiation position of the laser light 20. For example, the light source of the laser beam 20 may be rotated around the optical axis.

  Although the moving direction length L (refer FIG. 3) of the laser beam 20 in the laser irradiation surface 12a of the glass sheet 12 is not specifically limited, For example, it is 0.1 mm-60 mm, Preferably it is 1 mm-30 mm. Moreover, the movement orthogonal | vertical direction length W (refer FIG. 3) of the laser beam 20 in the laser irradiation surface 12a of the glass sheet 12 is although it does not specifically limit, For example, 0.01 mm-10 mm, Preferably it is 0.1 mm-5 mm.

  In the second step, as shown in FIG. 2, the glass sheet 12 is locally cooled with the refrigerant 40, and the supply position of the refrigerant 40 in the glass sheet 12 is interlocked with the irradiation position of the laser beam 20 in the glass sheet 12. You can move it. The supply position of the coolant 40 may be near the rear of the irradiation position of the laser beam 20. An abrupt temperature gradient occurs behind the irradiation position of the laser beam 20, and the distance between the irradiation position of the laser beam 20 and the tip position of the crack 31 is shortened.

  The refrigerant 40 may be either a gas (for example, compressed air at room temperature) or a liquid (for example, water at room temperature), or may include both.

  The nozzle 50 is formed in a cylindrical shape as shown in FIG. 2, for example, and discharges the refrigerant 40 toward the glass sheet 12.

  In order to move the supply position of the refrigerant 40 in the glass sheet 12, the glass sheet 12 may move, the nozzle 50 may move, or both may move.

  In the second step of this embodiment, as shown in FIG. 2, when the crack 31 is formed in the glass sheet 12, the resin film 14 is not cut. Therefore, the resin film 14 straddles the crack 31 and connects the glasses 121 and 122 on both sides sandwiching the crack 31. Since the glasses 121 and 122 on both sides sandwiching the crack 31 are connected by the resin film 14, the deformation of the glass is suppressed when the crack 31 is formed, and the position of the crack 31 is difficult to be removed from the desired position. Therefore, the cutting accuracy of the glass sheet 12 is improved. This effect is remarkable when the resin film 14 is formed over the entire cutting position of the glass sheet 12 (that is, the movement locus of the irradiation position of the laser beam 20 on the glass sheet 12).

  In the second step, as shown in FIG. 2, the laser light 20 may be irradiated to the glass sheet 12 from the side opposite to the resin film 14 side. While passing through the glass sheet 12, the laser light 20 is attenuated according to the light absorption rate of the glass sheet 12, and then enters the resin film 14. Therefore, the intensity of the laser beam 20 incident on the resin film 14 is low, and the resin film 14 is difficult to soften and melt. When a part of the resin film 14 is melted, the melted part may be torn by surface tension.

  In the second step, as shown in FIG. 2, by moving the irradiation position of the laser beam 20 on the glass sheet 12, a linear heat-degraded portion 143 is formed on the resin film 14 along the movement locus. Good. Here, “thermal degradation” refers to the occurrence of carbonization, foaming, or the like due to heat, and the tensile strength of the resin film 14 after laser irradiation is 0.01 based on the tensile strength (MPa) of the resin film 14 before laser irradiation. % Means a decrease. In the tensile strength test, a tensile stress in a direction orthogonal to the linear thermally deteriorated portion 143 is applied to the resin film 14.

  By forming the linear heat deterioration part 143 in the resin film 14, the resin film 14 is easily bent around the heat deterioration part 143. The tensile strength of the resin film 14 after laser irradiation is preferably decreased by 0.1% or more, more preferably 1% or more, based on the tensile strength of the resin film 14 before laser irradiation.

  The heat deterioration part 143 is formed in the surface 14a (refer FIG. 5) which contacts the glass sheet 12 in the resin film 14. FIG. As shown in FIG. 5, the thermally deteriorated portion 143 may or may not penetrate the resin film 14 in the thickness direction. Note that a groove line (scribe line) following the crack 31 of the glass sheet 12 may be formed in the thermally deteriorated portion 143.

  By the way, when the irradiation position of the laser beam 20 on the glass sheet 12 is moved, as shown in FIG. 4, the glass sheet 12 penetrates in the thickness direction at the end of the glass sheet 12 which is the terminal part of the movement locus. It is difficult to form cracks 31 that do. This is because the crack 31 basically extends due to the tensile stress generated behind the irradiation position of the laser beam 20. The tensile stress includes (i) tensile stress due to reaction of compressive stress by laser light irradiation, (ii) tensile stress due to thermal expansion of resin due to heating of laser light, and preferably (iii) tensile stress due to supply of refrigerant. Is considered to be caused by the interaction. Moreover, it is considered that the cutting accuracy is increased by this interaction.

  When the tip of the crack 31 approaches the end of the glass sheet 12, the crack 31 extends and the glass sheet 12 is divided by a slight external force. Therefore, when the composite sheet 10 is removed from the support after the laser beam 20 is irradiated, if the composite sheet 10 is slightly bent, the end portion of the glass sheet 12 is cut by the stress.

  In the present embodiment, when the composite sheet 10 is slightly bent, the resin film 14 is bent around the linear heat-degraded portion 143 as shown in FIG. 6, and the end of the glass sheet 12 is matched with the deformation of the resin film 14. The part bends. Since the linear thermal degradation part 143 is formed along the movement locus of the irradiation position of the laser beam 20, the end of the glass sheet 12 is bent around the movement locus. Therefore, the edge part of the glass sheet 12 is cut | disconnected along the movement locus | trajectory of the laser beam 20, and control of a cutting position is attained. This effect is remarkable when the heat deterioration part 143 is formed in the edge part of the resin film 14 corresponding to the cutting | disconnection end position of the glass sheet 12. FIG.

  The thermally deteriorated portion 143 is desirably formed from the end (laser irradiation start point) to the end (laser irradiation end point) of the resin film 14. The resin film 14 is easily bent around the thermally deteriorated portion 143.

  In the present embodiment, the step of cutting the end portion of the glass sheet 12 that is the terminal portion of the movement locus of the irradiation position of the laser beam 20 is performed when the composite sheet 10 is removed from the support after the irradiation of the laser beam 20. Although it is performed, it may be performed after removing the composite sheet 10 from the support base.

  In the third step, the resin film 14 is cut as shown in FIG. 8 to obtain a plurality of resin films 141 and 142. Thereby, a plurality of cut pieces 111 and 112 are obtained. One cut piece 111 includes a glass sheet 121 and a resin film 141 bonded to the glass sheet 121. The other cut piece 112 includes a glass sheet 122 and a resin film 142 bonded to the glass sheet 122.

  In the present embodiment, as shown in FIGS. 4 to 7, a linear thermal deterioration portion 143 is formed on the resin film 14 along the movement locus of the irradiation position of the laser beam 20 on the glass sheet 12. Therefore, as shown in FIG. 8, the resin film 14 can be cut (cleaved) along the thermally deteriorated portion 143 by bending the resin film 14 around the linear thermally deteriorated portion 143. When the resin film 14 is bent around the linear heat-degraded portion 143, it is preferable to bend the resin film 14 so that the glass cut surfaces do not rub.

  The linear thermal degradation part 143 is formed along the movement locus of the irradiation position of the laser beam 20. Therefore, as shown in FIG. 9, the cut surface of the glass sheet 121 obtained by cutting is flush with the cut surface of the resin film 141 obtained by cutting. Similarly, the cut surface of the glass sheet 122 obtained by cutting and the cut surface of the resin film 142 obtained by cutting are flush with each other. Compared to the case where the cut surface of the resin film is recessed from the cut surface of the glass sheet, the glass sheets 121 and 122 are less likely to be damaged, and the cut pieces 111 and 112 can be easily stored.

  In the third step of the present embodiment, the resin film 14 is cut by bending the resin film 14, but the cutting method of the resin film 14 is not particularly limited. For example, as a method of cutting a resin film in which the cut surface of the resin film is flush with the cut surface of the glass sheet, a method of tearing the resin film along a linear heat-degraded part, along a linear heat-degraded part with a cutter A method of cutting the resin film can also be used. Moreover, although the cut surface of the resin film is somewhat recessed from the cut surface of the glass sheet, a method of locally vaporizing the resin film with a laser can also be used as a method of cutting the resin film 14.

[Second Embodiment]
The embodiment described above relates to a method for cutting the composite sheet 10 including the glass sheet 12 and the resin film 14.

  On the other hand, the present embodiment relates to a method for cutting the glass sheet 12. Although the cutting method of the glass sheet 12 may have the process of FIGS. 1-7 similarly to the cutting method of the composite sheet 10, since these processes are the same processes, description is abbreviate | omitted.

  FIG. 10 is an explanatory diagram of a method for cutting a glass sheet according to the second embodiment of the present invention, and is a diagram illustrating a process performed subsequent to the process of FIG.

  The cutting method of the glass sheet 12 has the process of peeling the glass sheet 12 and the resin film 14, as shown in FIG. When the glass sheet 12 and the resin film 14 are peeled, the peel strength of the resin film 14 is, for example, 3 N / 25 mm or less, preferably 1 N / 25 mm or less so that the glass sheet 12 is not damaged during peeling.

  The peeling method of the glass sheet 12 and the resin film 14 is not particularly limited. For example, a step of inserting a thin blade at the interface between the glass sheet 12 and the resin film 14 to produce a peeling starting point, and holding the glass sheet 12 flat. However, the resin film 14 may be sequentially bent and deformed from the peeling start point. By holding the glass sheet 12 flat at the time of peeling, the breakage of the glass sheet 12 can be reduced.

  When peeling the glass sheet 12 and the resin film 14, it is preferable that the resin film 14 is not cut | disconnected. The plurality of glasses 121 and 122 and the resin film 14 can be peeled in one operation.

  In addition, the process of peeling the glass sheet 12 and the resin film 14 may be performed after the resin film 14 is cut, and may be performed, for example, following the process of FIG.

  The glass sheet cutting method may further include a step of forming the resin film 14 on the glass sheet 12.

In the following examples and comparative examples, unless otherwise specified, as a glass sheet, a 150 mm square glass sheet (thickness 100 μm, average linear expansion coefficient 38 × 10 ⁻⁷ / ° C., alkali-free glass manufactured by Asahi Glass Co., Ltd., trade name: AN100 ) Was used.

[Example 1]
In Example 1, after the surface of the glass sheet on which the resin film was formed was surface-treated, a polyimide film (150 mm square, thickness 5 μm) was formed as the resin film. The surface treatment of the glass sheet was performed by applying aminopropyltrimethoxysilane with a spin coater. The polyimide film was formed by applying polyimide varnish (H851D, manufactured by Arakawa Chemical Co., Ltd.) to the surface-treated surface of the glass sheet with a spin coater and heat-treating at 250 ° C. for 30 minutes.

  In Example 1, the composite sheet which consists of the produced glass sheet and a polyimide film was cut | disconnected by the method shown in FIGS.

First, the glass sheet was cut. Eight initial cracks were formed at 20 mm pitch on one of the four sides of the rectangular glass sheet. The composite sheet was placed on the support with the polyimide film facing downward. The laser beam was locally irradiated on the glass sheet from a CO ₂ laser (wavelength 10600 nm, output 39 W). The laser scanning speed was 130 mm / sec. The irradiation position of the laser beam on the glass sheet was moved from the formation position of each initial crack to another side parallel to the one side perpendicular to the one side forming the initial crack. The movement trajectory was linear. Moreover, the mist-like droplet which is a refrigerant | coolant was supplied locally to the glass sheet from the nozzle. The supply position of the coolant was positioned in the vicinity of the rear of the laser light irradiation position and moved in conjunction with the laser light irradiation position.

  As a result, eight cracks were formed on the glass sheet along the movement trajectory of the irradiation position of the laser beam starting from the initial crack. Each crack penetrated the glass sheet in the plate thickness direction, and was not formed at the terminal portion of the movement locus of the irradiation position of the laser beam. In addition, a linear thermal degradation portion was formed on the polyimide film along the entire movement locus of the irradiation position of the laser beam. The polyimide film straddled the crack and connected the glass on both sides sandwiching the crack.

  Thereafter, when the composite sheet was removed from the support base, the polyimide film was slightly bent and deformed around the linear heat-degraded portion. The edge part of the glass sheet was bent according to the deformation, and the edge part of the glass sheet was cut. In this way, the glass sheet was cut.

  Subsequently, the polyimide film was bent around the linearly deteriorated part, and the polyimide film was cleaved along the thermally deteriorated part. Since the linear thermally deteriorated portion is formed along the entire movement locus of the irradiation position of the laser beam on the glass sheet, the cut surface of the resin film and the cut surface of the glass sheet are substantially flush with each other.

  In this way, the composite sheet was cut. The cutting accuracy of the composite sheet was evaluated by a deviation width between the actual cutting position in the glass sheet and the linear target cutting position (hereinafter referred to as “cutting deviation width in the glass sheet”). The evaluation was performed separately for the terminal portion and the other portion of the movement locus of the irradiation position of the laser beam.

  In Example 1, the maximum deviation width of the cut in the glass sheet was 0 mm in both the terminal portion and the other portion of the movement locus of the irradiation position of the laser beam.

[Example 2]
In Example 2, a polyimide resin (150 mm square, thickness 38 μm, manufactured by Arakawa Chemical Co., Ltd., trade name Pomilan) was coated with a polyimide silicone adhesive (thickness 10 μm, manufactured by Arakawa Chemical Co., Ltd., trade name H802) and laminated resin film. Was made. The pressure-sensitive adhesive side of the produced laminated resin film was stuck on a glass sheet to produce a composite sheet.

  Subsequently, similarly to Example 1, the glass sheet was locally irradiated with laser light, and the irradiation position was moved. Moreover, like Example 1, the refrigerant | coolant was locally supplied to the glass sheet and the supply position was moved.

  As a result, eight cracks were formed on the glass sheet along the movement trajectory of the irradiation position of the laser beam starting from the initial crack. Each crack penetrated the glass sheet in the plate thickness direction, and was not formed at the terminal portion of the movement locus of the irradiation position of the laser beam. Moreover, the linear heat deterioration part was formed in the laminated resin film along the whole movement locus of the irradiation position of a laser beam. The laminated resin film straddled the crack and connected the glass on both sides sandwiching the crack.

  Thereafter, when the composite sheet was removed from the support base, the laminated resin film was slightly bent and deformed around the linear heat-deteriorated portion. The edge part of the glass sheet bent slightly according to the deformation | transformation, and the edge part of the glass sheet was cut | disconnected. In this way, the glass sheet was cut.

  Subsequently, the laminated resin film was bent around the linear heat-degraded part, and the laminated resin film was cleaved along the heat-degraded part. Since the linear heat-degraded part is formed along the entire movement locus of the laser beam irradiation position on the glass sheet, the cut surface of the laminated resin film and the cut surface of the glass sheet are substantially flush with each other. .

  In this way, the composite sheet was cut. Of the movement locus of the irradiation position of the laser beam, the maximum deviation width of the cut in the glass sheet was 0 mm in both the terminal portion and the other portion.

[Example 3]
In Example 3, a laminated resin film (trade name: 635F, manufactured by Teraoka Seisakusho Co., Ltd.) comprising a polyethylene naphthalate (PEN) film (150 mm square, thickness 50 μm) as a base material and an acrylic adhesive (thickness 30 μm). Prepared. A composite sheet was prepared by attaching the pressure-sensitive adhesive side of the prepared laminated resin film to a glass sheet.

  Subsequently, similarly to Example 1, the glass sheet was locally irradiated with laser light, and the irradiation position was moved. Moreover, like Example 1, the refrigerant | coolant was locally supplied to the glass sheet and the supply position was moved.

  As a result, eight cracks were formed on the glass sheet along the movement trajectory of the irradiation position of the laser beam starting from the initial crack. Each crack penetrated the glass sheet in the plate thickness direction, and was not formed at the terminal portion of the movement locus of the irradiation position of the laser beam. Moreover, the linear heat deterioration part was formed in the laminated resin film along the whole movement locus of the irradiation position of a laser beam. The laminated resin film straddled the crack and connected the glass on both sides sandwiching the crack.

  Thereafter, when the composite sheet was removed from the support base, the laminated resin film was slightly bent and deformed around the linear heat-deteriorated portion. The edge part of the glass sheet was bent according to the deformation, and the edge part of the glass sheet was cut. In this way, the glass sheet was cut.

  Subsequently, the laminated resin film was bent around the linear heat-degraded portion, and the laminated resin film was cut (cleaved) along the heat-degraded portion. Since the linear heat-degraded part is formed along the entire movement locus of the laser beam irradiation position on the glass sheet, the cut surface of the laminated resin film and the cut surface of the glass sheet are substantially flush with each other. .

  In this way, the composite sheet was cut. Of the movement locus of the irradiation position of the laser beam, the maximum deviation width of the cut in the glass sheet was 0 mm in both the terminal portion and the other portion.

[Example 4]
In Example 4, a cyclic polyolefin (COP) film (150 mm square, thickness 50 μm, manufactured by Zeon Corporation, trade name ZF14) was prepared. The prepared COP film was activated by corona discharge, and heated and bonded onto a glass sheet to produce a composite sheet.

  Subsequently, similarly to Example 1, the glass sheet was locally irradiated with laser light, and the irradiation position was moved. Moreover, like Example 1, the refrigerant | coolant was locally supplied to the glass sheet and the supply position was moved.

  As a result, eight cracks were formed on the glass sheet along the movement trajectory of the irradiation position of the laser beam starting from the initial crack. Each crack penetrated the glass sheet in the plate thickness direction, and was not formed at the terminal portion of the movement locus of the irradiation position of the laser beam. In addition, a linear thermally deteriorated portion was formed on the COP film along the entire movement locus of the irradiation position of the laser beam. The COP film straddled the crack and connected the glass on both sides sandwiching the crack.

  Thereafter, when the composite sheet was removed from the support base, the COP film was slightly bent and deformed around the linear heat-degraded portion. The edge part of the glass sheet was bent according to the deformation, and the edge part of the glass sheet was cut. In this way, the glass sheet was cut.

  Subsequently, the COP film was bent around the linearly deteriorated part, and the COP film was cut (cleaved) along the thermally deteriorated part. Since the linear thermally deteriorated portion is formed along the entire movement locus of the irradiation position of the laser beam on the glass sheet, the cut surface of the COP film and the cut surface of the glass sheet are substantially flush with each other.

  In this way, the composite sheet was cut. Of the movement locus of the irradiation position of the laser beam, the maximum deviation width of the cut in the glass sheet was 0 mm in both the terminal portion and the other portion.

[Example 5]
In Example 5, a laminated resin film (150 mm square, manufactured by Somaru, trade name Somatac PS-250WA) composed of a polyethylene terephthalate (PET) film (thickness 125 μm) as a base material and an acrylic adhesive (thickness 16 μm). ) Was prepared. A composite sheet was prepared by attaching the pressure-sensitive adhesive side of the prepared laminated resin film to a glass sheet.

  Subsequently, similarly to Example 1, the glass sheet was locally irradiated with laser light, and the irradiation position was moved. Moreover, like Example 1, the refrigerant | coolant was locally supplied to the glass sheet and the supply position was moved.

  As a result, eight cracks were formed on the glass sheet along the movement trajectory of the irradiation position of the laser beam starting from the initial crack. Each crack penetrated the glass sheet in the plate thickness direction, and was not formed at the terminal portion of the movement locus of the irradiation position of the laser beam. Moreover, the linear heat deterioration part was formed in the laminated resin film along the whole movement locus of the irradiation position of a laser beam. The laminated resin film straddled the crack and connected the glass on both sides sandwiching the crack.

  Thereafter, when the composite sheet was removed from the support base, the laminated resin film was slightly bent and deformed around the linear heat-deteriorated portion. The edge part of the glass sheet was bent according to the deformation, and the edge part of the glass sheet was cut. In this way, the glass sheet was cut.

  Subsequently, a thin blade is inserted into the interface between the glass sheet and the laminated resin film to produce a peeling start point, and while holding the glass sheet 12 flat, the laminated resin film is sequentially bent and deformed from the peeling start point, and a plurality of glasses are formed at a time. Single plate strip was peeled off. The peel strength was 0.11 N / 25 mm.

  In this way, the glass sheet was cut. Of the movement locus of the irradiation position of the laser beam, the maximum deviation width of the cut in the glass sheet was 0 mm in both the terminal portion and the other portion.

[Example 6]
In Example 6, a laminated resin film (150 mm square, manufactured by 3M, product number 7414) composed of a polyimide film (thickness 25 μm) as a base material and an acrylic pressure-sensitive adhesive (thickness 22 μm) was prepared. A composite sheet was prepared by pasting the pressure-sensitive adhesive side of the prepared laminated resin film on a glass sheet.

  Subsequently, similarly to Example 1, the glass sheet was locally irradiated with laser light, and the irradiation position was moved. Moreover, like Example 1, the refrigerant | coolant was locally supplied to the glass sheet and the supply position was moved.

  As a result, eight cracks were formed on the glass sheet along the movement trajectory of the irradiation position of the laser beam starting from the initial crack. Each crack penetrated the glass sheet in the plate thickness direction, and was not formed at the terminal portion of the movement locus of the irradiation position of the laser beam. Moreover, the linear heat deterioration part was formed in the laminated resin film along the whole movement locus of the irradiation position of a laser beam. The laminated resin film straddled the crack and connected the glass on both sides sandwiching the crack.

  Thereafter, when the composite sheet was removed from the support base, the laminated resin film was slightly bent and deformed around the linear heat-deteriorated portion. The edge part of the glass sheet was bent according to the deformation, and the edge part of the glass sheet was cut. In this way, the glass sheet was cut.

  Subsequently, a thin blade is inserted into the interface between the glass sheet and the laminated resin film to produce a peeling start point, and while the glass sheet is held flat, the laminated resin film is sequentially bent and deformed from the peeling start point, and a plurality of glass units are The strip was peeled off. The peel strength was 0.69 N / 25 mm.

  In this way, the glass sheet was cut. Of the movement locus of the irradiation position of the laser beam, the maximum deviation width of the cut in the glass sheet was 0 mm in both the terminal portion and the other portion.

[Comparative Example 1]
In Comparative Example 1, a 150 mm square glass sheet without a resin film was cut. Specifically, as in Example 1, the glass sheet was locally irradiated with laser light, and the irradiation position was moved. Moreover, like Example 1, the refrigerant | coolant was locally supplied to the glass sheet and the supply position was moved.

  As a result, eight cracks were formed on the glass sheet along the movement trajectory of the irradiation position of the laser beam starting from the initial crack. Each crack penetrated the glass sheet in the plate thickness direction, and was not formed at the terminal portion of the movement locus of the irradiation position of the laser beam.

  Thereafter, when the glass sheet was removed from the support, the glass sheet was bent, and the stress caused the crack to extend in an unintended direction.

  In Comparative Example 1, the maximum deviation width of the cutting was 1 mm to 3 mm in the terminal portion of the movement locus of the irradiation position of the laser beam on the glass sheet. Further, in the movement locus of the irradiation position of the laser beam on the glass sheet, the maximum deviation width of the cutting was about 1 mm in a portion other than the terminal portion.

[Comparative Example 2]
In Comparative Example 2, a composite sheet was produced in the same manner as in Example 1 except that the film thickness of the polyimide film was 0.5 μm.

  Subsequently, similarly to Example 1, the glass sheet was locally irradiated with laser light, and the irradiation position was moved. Moreover, like Example 1, the refrigerant | coolant was locally supplied to the glass sheet and the supply position was moved.

  As a result, eight cracks were formed on the glass sheet along the movement trajectory of the irradiation position of the laser beam starting from the initial crack. Each crack penetrated the glass sheet in the plate thickness direction, and was not formed at the terminal portion of the movement locus of the irradiation position of the laser beam. On the other hand, the polyimide film was cut along the entire movement locus of the irradiation position of the laser beam.

  Thereafter, when the composite sheet was removed from the support base, the glass sheet was bent, and the stress caused the crack to extend in an unintended direction. In this way, the composite sheet was cut.

  Of the movement trajectory of the irradiation position of the laser beam on the glass sheet, the maximum deviation width of the cutting was 1 mm to 3 mm at the terminal portion. Further, in the movement locus of the irradiation position of the laser beam on the glass sheet, the maximum deviation width of the cutting was about 1 mm in a portion other than the terminal portion.

[Summary]
The results of Examples 1 to 3 and Comparative Examples 1 and 2 are summarized in Tables 1 to 3.

表１〜表３から、次のことが明らかである。ガラスシートを切断するためのレーザ走査時に、ガラスシートに樹脂膜が付いており、付いた樹脂膜が切断されない実施例１〜５では、比較例１〜２に比べて、ガラスシートの切断精度が良い。また、ガラスシートにおけるレーザ光の照射位置を移動することで、移動軌跡に沿って線状の熱劣化部を樹脂膜に形成する実施例１〜５では、比較例１〜２に比べて、レーザ光の照射位置の移動軌跡の終端部である、ガラスシートの端部での切断精度が良い。

From Tables 1 to 3, the following is clear. In laser scanning for cutting the glass sheet, the glass sheet has a resin film, and in Examples 1 to 5 in which the attached resin film is not cut, the cutting accuracy of the glass sheet is higher than that of Comparative Examples 1 and 2. good. Moreover, in Examples 1-5 which form a linear thermal deterioration part in a resin film along a movement locus | trajectory by moving the irradiation position of the laser beam in a glass sheet, it is a laser compared with Comparative Examples 1-2. The cutting accuracy at the end of the glass sheet, which is the end of the movement locus of the light irradiation position, is good.

  As mentioned above, although the cutting method of the composite sheet and the cutting method of the glass sheet have been described in the embodiments and the like, the present invention is not limited to the above embodiments and the like, and various modifications and changes can be made within the scope described in the claims. Improvements are possible.

  This application claims priority based on Japanese Patent Application No. 2012-182656 filed with the Japan Patent Office on August 21, 2012. The entire contents of Japanese Patent Application No. 2012-182656 are incorporated herein by reference. To do.

DESCRIPTION OF SYMBOLS 10 Composite sheet 12 Glass sheet 14 Resin film 143 Thermal degradation part 20 Laser beam 30 Initial crack 31 Crack 40 Refrigerant 50 Nozzle

Claims (11)

A method of cutting a composite sheet comprising a glass sheet having a thickness of 200 μm or less and a resin film formed on the glass sheet,
The glass sheet of the composite sheet is locally irradiated with laser light, the glass sheet is locally heated at a temperature below the annealing point of the glass, and the irradiation position of the laser light in the glass sheet is moved, A step of extending a crack penetrating the glass sheet in the thickness direction along the movement trajectory,
In more該工, across the resin film is the crack, the glass of both sides of the crack tuna technique,
Further, in this step, when moving the irradiation position of the laser light on the glass sheet, along the movement trajectory, a linear thermal deterioration portion is formed on the resin film,
Here, the thermal deterioration means that the tensile strength of the resin film after laser irradiation is reduced by 0.01% or more based on the tensile strength (MPa) of the resin film before laser irradiation.
A method for cutting a composite sheet, wherein the resin film is cut after the step. The method for cutting a composite sheet according to claim 1 , wherein an end portion of the glass sheet, which is a terminal portion of the movement locus, is cut by bending the resin film around the linear heat-deteriorated portion. The method of cutting a composite sheet according to claim 1 or 2 , wherein the resin film is cut along the thermally deteriorated portion by bending the resin film around the linear thermally deteriorated portion. In the said process, the cutting method of the composite sheet as described in any one of Claims 1-3 which irradiates the said laser beam from the opposite side to the said resin film side with respect to the said glass sheet. The cutting method of the composite sheet as described in any one of Claims 1-4 which further has the process of forming the initial stage crack used as the starting point of the crack which penetrates the said glass sheet in the thickness direction in the said glass sheet. Wherein the glass sheet of the composite sheet is locally cooled by the refrigerant, the supply position of the refrigerant in the glass sheet, is moved in conjunction with the irradiation position of the laser beam in the glass sheet, claim 1-5 The method for cutting a composite sheet according to one item. A method for cutting a glass sheet having a thickness of 200 μm or less,
The glass sheet of the composite sheet including the glass sheet and the resin film formed on the glass sheet is locally irradiated with laser light, and the glass sheet is locally heated at a temperature below the annealing point of the glass. The step of moving the irradiation position of the laser light in the glass sheet, and extending a crack penetrating the glass sheet in the thickness direction along the movement locus,
In more該工, across the resin film is the crack, the glass of both sides of the crack tuna technique,
Further, in this step, when moving the irradiation position of the laser light on the glass sheet, along the movement trajectory, a linear thermal deterioration portion is formed on the resin film,
Here, the thermal deterioration means that the tensile strength of the resin film after laser irradiation is reduced by 0.01% or more based on the tensile strength (MPa) of the resin film before laser irradiation.
The glass sheet cutting method of cutting an end portion of the glass sheet, which is a terminal portion of the movement locus, by bending the resin film around the linear heat-deteriorated portion after the step . The cutting method of the glass sheet of Claim 7 which peels the said resin film and the said glass sheet in the state in which the said resin film is not cut | disconnected. The method for cutting a glass sheet according to claim 7 or 8 , wherein, in the step, the laser light is irradiated to the glass sheet from a side opposite to the resin film side. It said glass further having an initial crack which becomes the starting point of the crack penetrating the thickness direction of the sheet forming the glass sheet, the glass sheet cutting method according to any one of claims 7-9. In the step, the glass sheet is locally cooled by the refrigerant, the supply position of the refrigerant in the glass sheet, is moved in conjunction with the irradiation position of the laser beam in the glass sheet, any of claims 7-10 The method for cutting a glass sheet according to one item.

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