JPWO2006129504A1 - Laminated glass cutting method and apparatus - Google Patents

Abstract

The laminated glass is efficiently cut using heat distortion without generating cullet. After incising cuts 5 serving as crack starting points in the vicinity of the cutting start point of the virtual cut line 7 of the laminated glass 1 in which two glass plates are bonded with an adhesive layer, the alignment is performed along the virtual cut line 7 from the cut part 5. Cracks required for cutting by heating both surfaces of the glass with the combustion flame of the heating burner 3 and then locally cooling the heating parts on both surfaces with a mist from the cooling nozzle 4 along a virtual cutting line with a width of 1 to 20 mm. 6 is formed along the virtual cut line 7 from the cut portion of the two glass plates, and the two glass plates are each folded along the crack, and then the adhesive layer is cut.

Description

  The present invention relates to the cutting of laminated glass, and in particular, by heating both sides of the laminated glass along the virtual cutting line with a combustion flame of a heating burner, and then locally cooling the heated virtual cutting line from both sides of the laminated glass. The present invention relates to a method and apparatus for cutting two glass plates constituting a laminated glass by continuously extending a crack along a virtual cut line from a cut formed at an end of the virtual cut line.

  Laminated glass is manufactured by sandwiching an adhesive layer such as polyvinyl butyral (hereinafter also referred to as an intermediate film) between two glass plates and integrating them by thermocompression bonding in an autoclave. Thus, the cutting of the laminated glass in which the two glass plates are bonded with a tough interlayer film requires that the two bonded glass plates must be cut individually, and further after the glass plate is cut. Since it is necessary to cut | disconnect an intermediate film, it is very complicated compared with the cutting | disconnection of a single glass plate.

  As a method for cutting such a laminated glass, several methods are known. For example, in Patent Document 1, after cutting the two glass plates bonded with an intermediate film with a cutter, a bending stress is applied to the cutting portions of the two glass plates, and the two glass plates are folded along the cutting lines. Furthermore, a method is shown in which the intermediate film is heated by a heater from the cut portion and melted.

  Further, in Patent Document 2, a cutting line is made on the glass plates on both sides of the laminated glass with a cutter, and then the edge of the laminated glass is gripped and a load is applied to the cutting line of one glass plate while applying a load. A method is shown in which both glass plates are cut by heating the cut portions of the glass plates, and then the intermediate film exposed between the cut ends of the cut glass plates is heated and cut.

  Further, in Patent Document 3, after pasting a cut line in a position to be cut on the inner surface of one glass plate before bonding the two glass plates, the adhesive of the other glass plate is further bonded. A cut line is put on the surface corresponding to the cut line, and the surface on which the cut line is put is cooled by placing it on the cooling plate, and the upper surface is pressed by the heating plate, so that the two glass plates bonded together are along the cut line. The method of cutting is shown. In this method, the upper surface of the bonded glass plate is rapidly heated by the heating plate and thermally expands, and tension is generated in the cut line portion due to the thermal stress that depends on the temperature difference between the cooling plate and the heating plate, and the bonding is performed. The glass plate is cut along the cutting line.

  As described above, the two glass plates are folded along the cut line by mechanical tension in Patent Document 1, mechanical force and thermal stress in Patent Document 2, and thermal stress in Patent Document 3. In this way, in the conventional cutting of laminated glass, even if the method of splitting is different, as shown in FIG. 8, a cut line 34 is previously placed in the two glass plates 1a and 1b bonded with the adhesive layer 1c. It cuts along this cutting line. That is, also in the method of patent document 2 and patent document 3 which cut | disconnects using a thermal stress, as mentioned above, the former makes a laminated glass, and then makes a cut line with a cutter on both surfaces. The inner surface is cut in advance with a cutter and then bonded to the lower glass plate. After bonding, the lower glass plate is cut with a cutter.

Patent Document 4 discloses a method of cutting a normal glass plate (single plate) that is not laminated glass. A small notch serving as a crack starting point is made at one end of the glass plate, and then the glass plate is inserted from the cut portion by laser light. By locally heating along the direction of cutting, the crack at the crack starting point is extended along the path of the laser beam by the action of thermal strain (stress) generated by this heating, and the propagation of the crack In order to promote this, it is disclosed that it is preferable to cool the heating part with a water jet.
JP 7-69663 A JP-A-62-1973329 JP 57-175741 A JP-A-9-12327

  In the cutting of the laminated glass described above, the cutting line is cut into the glass surface by a cutter such as a diamond wheel or a cemented carbide wheel. Thus, if a laminated glass is cut using a cutter, it will have the following problems.

  That is, as shown in FIG. 9, the vertical crack 14 and the horizontal crack 15 generate | occur | produce in the glass plate which formed the cut line 13 with the cutter wheel 17. FIG. The vertical crack 14 is necessary for breaking the glass plate. However, the horizontal crack 15 extends toward the glass surface with time, and a portion indicated by diagonal lines is cut off to form cullet (glass waste) 16. Furthermore, when the cutting line 13 is made with the cutter wheel 17, the glass surface layer portion of the vertical crack 14 is cut into a groove shape, so that a brush-like cutting line mark is formed on the surface layer portion of the cut surface, and a fine cullet is also formed here. appear. The cullet has the property that once it adheres to the glass surface, it is difficult to peel off, and the cullet generated after cutting enters between the laminated glass and the laminated glass. Scraping and rubbing causes scratches on the glass surface and degrades the quality.

  Furthermore, when one glass plate of the laminated glass is a template glass having a concavo-convex pattern on the surface, cutting is not possible because the concavo-convex surface of the template glass cannot be cut well and continuously with a cutter. Yield reduction due to defects.

  Furthermore, in the conventional method of cutting and cutting with a cutter, when the interlayer film is cut after the glass plate is broken, heating for softening the interlayer film requires several tens of seconds, so productivity is poor. There's a problem.

  In addition, since the cut end portion of the cut laminated glass is heated when the intermediate film is heated and melted, and the intermediate film is melted, the cut laminated glass is subsequently orthogonal to the cut end portion. If a cutter is used to cut and fold and then perform the second cutting, there is a problem that the linearity of the crack in the second cutting is impaired in the vicinity of the high-temperature cutting end, and the cutting breakage occurs. For this reason, the second end must be cut after the cut end has cooled.

  In addition, the method of Patent Document 4 uses a thick glass plate because the fine cracks at the cutting start point are extended along the path of the laser beam using the thermal stress generated by the local heating by the laser beam as described above. When the glass is cut, strong heating is required, and the glass surface that has been heated intensively with the laser beam may melt, making it difficult to cut or degrading the quality of the cut surface. Such a problem also applies to the cutting of laminated glass. Furthermore, installing expensive laser devices on both sides of the laminated glass is disadvantageous in terms of both the device and the economy, including safety considerations for workers.

  The present invention is a laminated glass that can cut a laminated glass without cutting with a cutter so that even a thick glass plate can be stably cut without generating cullet, and a high-quality cut surface with excellent linearity can be obtained. An object of the present invention is to provide a cutting method and apparatus.

As a result of various investigations to solve the above-mentioned problems, the present invention heats a virtual cut line portion of a laminated glass having a notch serving as a crack starting point to both sides with a burner combustion flame to a predetermined width and temperature. It has been found that good cutting excellent in linearity can be obtained by locally cooling the virtual cutting line portion along the virtual cutting line with mist. That is, the present invention provides the following laminated glass cutting method and apparatus.
(1) A method for cutting laminated glass in which two glass plates are bonded with an adhesive layer, wherein a cutter, a heating burner, and a cooling nozzle are installed facing each other on both sides of the laminated glass. In the glass plate, incision of the crack starting point near the cutting start point of the virtual cut line with a cutter, the surface of the laminated glass is heated by the combustion flame of the heating burner along the virtual cutting line from the cut part, By locally cooling the heating part of this surface with a mist from a cooling nozzle with a width of 1 to 20 mm along a virtual cut line, a crack necessary for cutting is formed along the virtual cut line from the cut part of this glass plate, A method for cutting laminated glass, comprising: cutting the adhesive layer after breaking the glass plate along the cracks.
(2) A method for cutting laminated glass in which two glass plates are bonded with an adhesive layer, wherein a cutter, a heating burner, and a cooling nozzle are installed opposite to each other on both sides of the laminated glass. After cutting each of the cut starting points of the virtual cut lines on both sides with a cutter, the both sides of the laminated glass are heated along the virtual cut lines from the cut portions by a combustion flame of a heating burner, By locally cooling the heating parts on both sides with a mist from the cooling nozzle along the virtual cutting line with a width of 1 to 20 mm, the cracks necessary for cutting are formed along the virtual cutting line from the cut parts of the two glass plates, respectively. A method for cutting laminated glass, characterized in that the adhesive layer is cut after each of the two glass plates is broken along the cracks.
(3) A method for cutting laminated glass in which two glass plates are bonded with an adhesive layer, wherein a crack necessary for cutting is formed on one surface of the laminated glass along a virtual cut line from a cut portion of the glass plate, Fold along the crack, and then form a crack necessary for cutting on the other surface along the virtual cut line from the cut portion of the glass plate, and after breaking along the crack, the adhesive layer is cut. (1) The method for cutting laminated glass.
(4) The glass surface temperature immediately after heating is such that the maximum heating temperature in the vicinity of the virtual cutting line is 130 ° C. or higher, and the left and right average temperatures at both ends of the 10 mm width centering on the virtual cutting line The cutting method of the laminated glass in any one of said (1)-(3) which heats both surfaces of a laminated glass so that it may become.
(5) The method for cutting laminated glass according to any one of (1) to (4), wherein the local cooling is performed in a state where the glass surface temperature in the vicinity of the virtual cutting line is 83 ° C. or higher.
(6) The method for cutting laminated glass according to any one of (1) to (5) above, wherein the maximum heating temperature in the vicinity of the virtual cutting line is 130 to 220 ° C.
(7) The method for cutting laminated glass according to any one of (1) to (6), wherein the cooling width by mist is 1 to 10 mm.
(8) Any of the above (1) to (7), wherein the local cooling is performed by a cooling nozzle having a gas injection port on the outer periphery of the liquid injection port at the center of the nozzle and protruding from the gas injection port. How to cut the laminated glass.
(9) Any of (1) to (8) above, wherein the time from the heating by the heating burner to the local cooling by the cooling nozzle is changed to change the glass surface temperature at the time of the local cooling to adjust the crack depth Cutting method of laminated glass.
(10) The alignment according to any one of (1) to (9) above, in which the heating burner and the cooling nozzle are moved along the virtual cutting lines on both surfaces of the laminated glass placed on the cutting stand to perform heating and local cooling, respectively. Glass cutting method.
(11) a cutter for engraving a cut that becomes a crack starting point in the vicinity of the cutting start point of the virtual cut line of the laminated glass, and a heating burner for heating the laminated glass from the cut part along the virtual cut line by a combustion flame A cooling nozzle for generating a mist for locally cooling the heated virtual cutting line part is installed on both sides of the laminated glass in this order from the downstream side in the cutting direction, and the virtual cutting line is cut from the cut part by the heating burner. After heating to a predetermined heating width and a heating temperature along the line, the heated virtual cut line part is locally cooled with a predetermined width by mist from the cooling nozzle, and along the virtual cut line from the cut part on both surfaces of the laminated glass A laminated glass cutting device characterized by causing cracks.
(12) The laminated glass cutting device according to (11), wherein the cooling nozzle includes a gas ejection port on an outer periphery of a liquid ejection port in a central portion of the nozzle, and the liquid ejection port protrudes from the gas ejection port.
(13) The laminated glass cutting device according to (12), wherein the protrusion c of the liquid nozzle of the cooling nozzle is 0 <c ≦ 20 mm.
(14) A relationship in which the inner diameter a of the liquid nozzle of the cooling nozzle is 0.15 to 0.6 mm, and the outer diameter b and inner diameter b ′ of the gas nozzle are bb ′ = 0.05 to 1.45 mm. The laminated glass cutting device according to any one of (11) to (13) above, wherein:

According to the present invention, it is possible to extend along the virtual cut line by heating with a combustion flame of a heating burner and local cooling with mist, on the both sides of the laminated glass. As a result, vertical cracks necessary for cutting can be formed without generating horizontal cracks without cutting the laminated glass plate surface with a cutter, thus preventing the occurrence of cullet and damaging the laminated glass surface by cullet. Can be prevented.
Moreover, the laminated glass using the template glass for which it is extremely difficult to engrave good and continuous cutting lines with a cutter can be cut without breaking.

  At that time, since a relatively wide range of the glass surface can be heated to a predetermined heating width and heating temperature with a heating burner, even a laminated glass using a thick glass plate can be simultaneously applied from both sides of the laminated glass without melting the glass surface. It can be cut by heating and local cooling with mist. Heating and cutting may be performed on one side of the laminated glass and then on the other side, or a predetermined time difference may be provided between the heating and cutting start times on one side and the other side of the laminated glass. May be attached.

  Moreover, since the area | region heated to the predetermined heating width and heating temperature with a heating burner is locally cooled with mist, the crack required for cutting can be extended with good linearity along the virtual cutting line, and can be cut well. Furthermore, since it is local cooling by mist, it can cut | disconnect without leaving a water droplet on the glass surface of a cooling part, and a dirt can be prevented.

  Moreover, at the time of cutting the two glass plates constituting the laminated glass, the adhesive layer (intermediate film) is also heated at the same time as the both surfaces of the laminated glass are heated along the virtual cutting line by the combustion flame of the heating burner. When the intermediate film is cut after the two glass plates are cut, the heating step for softening the adhesive layer can be omitted or greatly reduced, and the productivity is improved.

  Furthermore, according to the present invention, since the heating device can be configured with simple equipment without an expensive laser device, cutting equipment costs can be reduced and laminated glass can be cut at low cost.

  In a preferred embodiment of the present invention, the liquid and the gas ejected from the liquid ejection port are obtained by performing the local cooling with a cooling nozzle in which the liquid ejection port in the center of the nozzle protrudes from the gas ejection port provided annularly on the outer side. A mist having a narrow cooling width is generated from the gas injected from the injection port, and the virtual cut line portion heated by the burner combustion flame can be efficiently cooled locally by this mist. Thereby, since a crack can be extended to both surfaces of a laminated glass to sufficient depth along a virtual cutting line, even a thick glass plate can be cut | disconnected with high precision.

The top view of the cutting device of the laminated glass concerning the Example of this invention. The front view of the cutting part of the cutting device of FIG. The front view of a cooling nozzle. The bottom view of the cooling nozzle of FIG. The bottom view of the combustion port part of a heating burner. The temperature distribution figure in the direction orthogonal to the virtual cutting line of the heated glass plate. It is typical explanatory drawing when cut | disconnecting the cut laminated glass in a different direction succeedingly, (a) is a conventional case, (b) shows the case of this invention. Cross-sectional explanatory drawing of the laminated glass which gave the cutting line with the conventional cutter. Sectional drawing of the cut line part formed with the conventional cutter.

Explanation of symbols

1: Laminated glass, 2: Cutter, 3: Heating burner,
4: Cooling nozzle, 5: Cut, 6: Crack,
7: Virtual cutting line, 8: Air cylinder, 9: Cutting base,
10: Cutter base 11: Burner holding member, 12: Nozzle holding member,
13: Cut line, 14: Vertical crack, 15: Horizontal crack,
16: Caret, 17: Cutter wheel, 18: Liquid spout,
19: Gas injection port, 20: Water supply pipe, 21: Air supply pipe 22: Cut stand, 23: Flame outlet, 24: Combustion flame,
25: Caster, 26: Mist, 27: Notch
28: Mounting plate, 29: Motor, 30: Windshield cover,
31, 32: Height adjusting means, 33: Frame, 34: Cutter cutting line,
35: Cutting end portion 36: Second cutting portion

  The laminated glass in the present invention is obtained by adhering two glass plates with an adhesive layer, and can be used as a laminated glass for architectural, vehicle and industrial uses. The present invention is intended for cutting various types of laminated glass. The laminated glass includes, for example, a transparent glass plate and a transparent glass plate, a transparent glass plate and a template glass, a transparent glass plate and a metal wire network, depending on the types of glass plates (hereinafter referred to as laminated base plates) to be combined and combinations thereof. Examples thereof include laminated glass such as entering glass, laminated glass having a decorative member in an adhesive layer, and the like. In this case, the thickness of the laminated base plate is not limited. It can be used from thin to thick, and can be cut even by a thick glass plate of, for example, 10 mm or more, which is considered difficult to cut by a conventional cutter or the laser beam heating. Furthermore, normally, two laminated base plates having the same thickness are combined with an adhesive layer, but the thicknesses of the two laminated base plates may be different.

  As an adhesive layer of the laminated glass of the present invention, in addition to adhesive films such as polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), and urethane, thermoplastic resin adhesives, elastomer adhesives, thermosetting resin adhesives, and the like Can be preferably used, but polyvinyl butyral which has excellent strength and adhesion workability and has been used for many years is most suitable.

  In this invention, the cut | interruption which becomes a crack starting point is initially cut | engraved into both surfaces in the cutting | disconnection start part of the virtual cut line of a laminated glass. Generally, when a glass plate is cut, a cutting line is assumed based on the cutting size and cutting shape of the glass plate, and a crack is generated along the assumed cutting line to cut the glass plate. The virtual cutting line in the present invention means the cutting line assumed in this way. And the said cutting start part is corresponded to the edge part of this virtual cutting line, and makes the cut | disconnection used as a crack starting point here. In this case, if the position of the cut is too close to the end face of the laminated glass, the glass may be chipped or broken. Therefore, the actual cut position is about 1 to 3 mm from the end face of the laminated glass. Is preferred. In addition, the engraving of the cuts may be performed simultaneously for each glass plate of the laminated glass or separately.

  The cuts are formed as scratches on the glass surface layers on both sides by cutters (triggers) installed on both sides of the laminated glass. Due to this scratch, fine cracks that become crack starting points can be formed in the glass at the cut portion in the direction perpendicular to the glass surface. The depth of the crack (the length from the glass surface to the lower end of the crack) is preferably about 50 to 150 μm. When the depth of the crack is less than 50 μm, the crack does not sufficiently function as a crack starting point, and it becomes difficult to reliably extend the crack necessary for cutting starting from the crack. On the other hand, in order to make a crack deeper than 150 μm, the cutting pressure of the cutter has to be increased, which is not preferable because there is a possibility of generating chips and horizontal cracks that cause cullet. In addition, since the purpose of this cut is the crack starting point, the length of this cut may be usually about 5 to 10 mm.

  As the cutter, for example, a diamond wheel or a cemented carbide wheel having a function of scratching the glass surface can be preferably used, and a known glass cutting cutter can be diverted. The cutting method is substantially the same as the cutting method for cutting with a normal cutter except that the length is short, and it can be easily formed by moving the cutter in the direction of the virtual cutting line in a state of being pressed against the glass surface. .

  In the present invention, the glass plate cut at the end of the virtual cut line is then heated from the cut line along the virtual cut line by a combustion flame of a heating burner (also simply referred to as a burner). This heating can simultaneously heat both surfaces of the laminated glass along the virtual cutting line by relatively moving the burners installed on both sides of the laminated glass along the virtual cutting line of the laminated glass. In addition, this heating may perform simultaneously each glass plate of a laminated glass, and may perform it separately.

  In this case, the burning flame of the burner heats the virtual cut line portion of the laminated glass with the flame width and does not concentrate the heat like the laser beam, so that even a thick glass plate can be heated without melting the surface. And since the compressive-stress area | region is formed along the virtual cutting line of a laminated glass by the thermal expansion of the glass of the heated part, extension of a crack is accelerated | stimulated by locally cooling this compressive-stress area | region. Further, the heating by the burner combustion flame is easy to operate, and the burner can be installed at a relatively low cost, so that it is economical in terms of cost.

  The burner preferably burns combustible material and oxygen. As this combustible substance, city gas (coal gas, natural gas, etc.) is suitable in terms of low cost and ease of handling. However, the present invention is not limited to this, and hydrogen gas or liquid can be used. When heating the burner using oxygen and gas, the burner is a premixed type in which oxygen and gas are separately supplied to the burner and burned, but both are mixed in advance and fed to the burner as a mixed gas for combustion. The premixed type is preferred, but the premixed type is preferable because the burner can be brought closer to the glass surface to easily reduce the heating width and the flow rate of oxygen and gas can be reduced.

  On the other hand, in the premixed type, because of the difference in combustion structure, the distance between the burner and the glass surface is generally wider than that of the premixed type, so that the combustion flame spreads and a wide range of the glass plate tends to be heated and cracks. May occur. In such a case, if the slit of the shielding plate of a metal or a heat insulating material is provided between the burner and the laminated glass, the width of the combustion flame can be adjusted narrowly by the slit width, so that the above-described cracking can be prevented.

  Next, the heating in the present invention will be described in more detail with reference to the drawings. When the burner is moved along the virtual cut line of the laminated glass and sequentially heated (see FIGS. 1 and 2), both surfaces of the laminated glass are heated with a predetermined width along the virtual cut line. In addition, this heating may perform simultaneously each glass plate of a laminated glass, and may perform it separately. Also, in this case, if both sides of the laminated glass with two glass plates with the same thickness bonded with an adhesive layer are heated under the same heating conditions, the two glass plates are heated to substantially the same state. The upper glass plate will be described.

FIG. 6A illustrates the glass surface temperature distribution in the direction orthogonal to the virtual cut line immediately after heating of the glass plate thus heated. As shown in FIG. 6, the glass plate in which the virtual cut line portion S is heated by the burner is heated at a predetermined width on both sides around S, and the maximum heating temperature T (also referred to as the heating temperature T) is near the virtual cut line. It becomes the parabolic shape or mountain shape shown.
In FIG. 6, the horizontal axis represents the distance from S, and the vertical axis represents the temperature.

  In the present invention, an effective compressive stress region for promoting the extension of cracks can be formed by heating a glass plate to a predetermined temperature or more with a predetermined width along a virtual cutting line. The heating temperature is preferably such that the glass surface temperature immediately after heating is such that the maximum heating temperature T in the vicinity of the virtual tangent line is 130 ° C. or higher, preferably 130 to 220 ° C. Furthermore, it is preferable to heat so that the temperature within 10 mm width centering on a virtual cutting line may be 45% or more of the maximum heating temperature T. As shown in FIG. 6, the temperature distribution within the 10 mm width centered on the virtual cutting line has a parabolic shape, so that the vicinity of the virtual cutting line is the highest heating temperature T and the left and right ends of the 10 mm width are the lowest temperatures t (left and right ends). The average value of the temperature of the part is the same hereinafter), and this t is 45% or more with respect to T.

  Such a temperature distribution is obtained by burner heating, and it is difficult to obtain such a temperature distribution even when heated by laser light. This will be described with reference to FIG. A dotted line B in FIG. 6 shows, for reference, an image of the glass surface temperature distribution when the same glass plate is heated to the same maximum heating temperature T as the burner heating by the laser beam. As shown in the figure, since the glass of the virtual cut line portion is intensively heated locally with a narrow width in the laser beam, even if the vicinity of the virtual cut line is heated to T, the temperature t ′ at both ends of the 10 mm width is lower than t. The temperature is less than 45% of T. For this reason, the virtual cut line portion of the glass plate cannot be heated to a desired temperature distribution with laser light.

  When the maximum heating temperature T is lower than 130 ° C., it is difficult to apply sufficient heating in the thickness direction of the glass, and the thermal strain effect that promotes the extension of cracks is reduced. As a result, since the cracks are not smoothly extended, the linearity of the cracks may be deteriorated, or cracks having a depth effective for splitting may not be obtained. However, even if T exceeds a certain temperature, the crack extensibility hardly changes and the heating load increases, and if T becomes too high, the crack becomes difficult to extend straight in the thickness direction, Since cracks may be partially two, T is preferably 220 ° C. or lower. The T of the thick glass plate is preferably set higher than the T of the thin glass plate.

  The surface temperature of the laminated glass in the part heated by the burner is lowered by heat radiation and heat conduction to the surroundings until the next local cooling. The degree of the reduction varies depending on the time from heating to cooling and the ambient temperature, and cannot be determined unconditionally. However, the degree of the decrease increases as the time increases, and the temperature decreases as the ambient temperature decreases. If the glass surface temperature at the time of local cooling becomes too low, cracks are difficult to extend. In the present invention, it is important to maintain this temperature above a certain level. In the present invention, the glass surface temperature at the time of local cooling means the glass surface temperature when the heating part is cooled for the first time. As this temperature, 83 degreeC or more is preferable in the virtual cutting line vicinity, More preferably, it is 90 degreeC or more. If the glass surface temperature at the time of local cooling is maintained at 83 ° C. or higher, the extension of cracks is promoted and a crack having a desired depth can be formed along a virtual cut line.

  In the present invention, the maximum heating temperature T can be appropriately adjusted depending on heating conditions. That is, the thickness and type of the glass plate can be determined in consideration of the size and number of the burner outlets, the amount of oxygen / gas, the heating rate, alone or in combination. Furthermore, the heating temperature can also be adjusted by changing the distance between the burner (more precisely, the lower end of the combustion port of the burner) and the glass surface, that is, the height of the burner. For example, when the heating is insufficient, the burner is lowered, and when the heating temperature is too high, the burner is raised to adjust the temperature. In this case, if the burner is too high, the heating width of the combustion flame is widened, so that the heating efficiency is lowered. On the other hand, if the burner is too close, the state of the combustion flame becomes unstable and the crack depth tends to vary. . Furthermore, since the maximum heating temperature varies depending on the temperature of the glass plate during heating (hereinafter referred to as plate temperature) even under the same heating conditions, the heating conditions are preferably set in consideration of the plate temperature. Specifically, when the plate temperature is high, the amount of heating can be reduced.

  In the present invention, the laminated glass whose virtual cut line portion is heated in this way is then locally cooled on both sides along the virtual cut line. In addition, this local cooling may perform simultaneously each glass plate of a laminated glass, and may perform it separately. In addition, this local cooling is performed by installing a cooling nozzle upstream of the heating burner, and sequentially cooling the virtual cut line portion heated by the burner locally along the virtual cut line by the mist generated by the cooling nozzle. Is called. The cooling is preferably performed on both sides of the laminated glass substantially simultaneously. Since the glass plate at the virtual cut line heated by the burner is in a compressive stress region, when this region is locally cooled, the glass in the cooled portion receives a large thermal shock, and at the same time, heat shrinks and generates tensile stress. To do. For this reason, when the cut portion of the glass plate is cooled, the fine cracks of the cut portion extend deeply in the vertical direction due to this tensile stress, and are further guided along the virtual cut line by being led to the tensile stress zone. Cracks necessary for cutting are formed on both sides. In this case, in order to improve the linearity of the crack, it is most preferable to locally cool the vicinity of the virtual cutting line at the highest heating temperature.

  In the present invention, this local cooling is indispensable for accurately extending the crack necessary for cutting according to the virtual cutting line, and it is preferable to efficiently cool the heated virtual cutting line portion with a narrow cooling width by mist. The cooling width is 1 to 20 mm, preferably 1 to 10 mm. In general, the narrower the cooling width, the better. However, if the cooling width is less than 1 mm, a sufficient cooling effect cannot be obtained, and crack extension deteriorates. On the other hand, if the cooling width exceeds 20 mm, the linearity of the cracks deteriorates and the cutting accuracy decreases. If the cooling width is 1 to 10 mm, a crack having excellent linearity can be stably formed.

  In addition, when heating with a combustion flame of a predetermined width by providing a slit formed of a shielding plate of metal or a heat insulating material between the burner and the laminated glass when heating with the combustion flame of the burner, the width of the combustion flame The cooling width in local cooling is preferably narrower than the width of the combustion flame. If the cooling width is the same as the width of the combustion flame or wider than the width of the combustion flame, there will be no cracks even after cooling, or even if it enters, there is a risk that it will not be practically usable in terms of crack depth and linearity. .

  In the present invention, the local cooling can be preferably achieved by a cooling nozzle 4 as shown in FIG. 3 is a front view of the cooling nozzle 4, and FIG. 4 is a bottom view thereof. The cooling nozzle 4 has a nozzle structure in which an annular gas jet 19 is provided outside the liquid jet 18 at the center of the nozzle as shown in the figure, and the liquid jet 18 projects from the gas jet 19. ing. With such a nozzle structure, the liquid ejected from the liquid ejection port 18 of the cooling nozzle 4 can be misted by the high-pressure gas from the gas ejection port 19 at the same time as ejection, thereby generating a liquid-gas mixture (mist). At the same time, the spread of the mist in the lateral direction can be suppressed as much as possible by the high-pressure gas.

  By spraying the small mist generated by the cooling nozzle 4 onto the heated virtual cut line portion of the laminated glass, the virtual cut line portion can be locally cooled with a predetermined cooling width. That is, local cooling is possible. As such a locally cooled cooling medium, a mist having a high cooling efficiency due to the heat of vaporization is suitable. Unlike the water jet, this mist hardly wets the glass, which is advantageous for preventing the glass from being stained. The cooling nozzle 4 is particularly excellent as a nozzle capable of generating such mist.

  Next, the cooling nozzle 4 will be described in more detail. As shown in FIG. 3, the cooling nozzle 4 has a liquid jet 18 projecting from the outer gas jet 19 by c. The protrusion amount c is preferably 0 <c ≦ 20 mm, more preferably 0 <c ≦ 1.0 mm, and further preferably 0.3 ≦ c ≦ 0.7 mm. By projecting the liquid jet port 18 from the gas jet port 19 in this way, the gas jetted from the gas jet port 19 is immediately applied to the liquid jetted from the liquid jet port 18 so that the liquid is completely discharged. Or it can be almost completely misted. When the liquid jet port 18 does not protrude from the gas jet port 19, that is, when the liquid jet port 18 is at the same level as the gas jet port 19 or recedes from the gas jet port 19, an optimum mist for local cooling is obtained. It becomes difficult. Moreover, when c is larger than 20 mm, it becomes difficult to sufficiently mist the ejected liquid within a limited range up to the glass surface. Thus, since the cooling efficiency of the mist produced | generated with the cooling nozzle in which c is not suitable falls, even if it cools a glass plate with this mist, there exists a possibility that a crack may not enter to a desired depth.

  Further, in the preferred cooling nozzle, the inner diameter a of the liquid jet port 18 is preferably 0.15 to 0.6 mm, and more preferably one having a of 0.15 to 0.3 mm. If a is larger than 0.6 mm, the balance with the gas is lost and mist formation tends to be insufficient. On the other hand, if a is smaller than 0.15 mm, the cooling efficiency of the mist is lowered and the cooling may be insufficient.

  On the other hand, the gas injection port 19 is provided in an annular shape outside the liquid injection port 18. The outer diameter b and the inner diameter b ′ of the annular gas injection port 19 have a relationship that bb ′ is in a range of 0.05 to 1.45 mm in order to obtain a desired gas injection amount and mist width. It is preferable. If b-b 'is less than 0.05 mm, the amount of gas injection is insufficient and it becomes difficult to produce a preferred mist. Further, if b-b 'exceeds 1.45 mm, the mist is diluted by an excess gas, so that the cooling efficiency is lowered and it becomes difficult to form a desired crack, which is not preferable. In such a cooling nozzle having a double structure, the thickness d (see FIG. 4) of the nozzle of the liquid jet 18 is preferably 0.2 mm or less, and for this reason, the liquid jet 18 is about 0.05 mm. It is preferable to form the metal plate. In addition, when the liquid jet port 18 and the gas jet port 19 are elliptical or oval, a, b, b 'are the short diameters.

Water is most suitable as a liquid for generating mist in terms of cost, heat of vaporization, ease of handling, and the like. In this case, if the water temperature fluctuates, the mist temperature also fluctuates and the crack depth is affected, so normal temperature water is used to keep the water temperature as low and constant as possible to minimize variations in crack depth. Is preferred. Moreover, although it can implement if the amount of water ejected from the liquid jet outlet 18 is the range of 1-10 mL / min, about 3-6 mL / min is preferable practically, and the thickness of the glass plate which comprises a laminated glass Select appropriately depending on the type of sheath.
And since the fluctuation | variation of the water quantity in work changes the depth of a crack, it keeps a water quantity constant during a work | work.

  Usually, air is used as a gas used for generating mist. The pressure of the air ejected from the gas ejection port is selected so that the liquid ejected from the liquid ejection port can be misted. The air pressure is not limited. However, the higher the pressure is, the more the mist spread is suppressed and the cooling width can be kept narrow. However, if the air pressure is too high, the air that collides with the glass surface rebounds and collides with the liquid ejected from the liquid ejection port from the opposite direction. Therefore, the air pressure is preferably 0.1 to 0.4 MPa. 0.12-0.24 MPa is preferable.

  When locally cooling the heated virtual cut line portion of the laminated glass with the mist generated by the cooling nozzle, the cooling width is substantially the same as the width of the mist that hits the glass surface (hereinafter referred to as the mist width). The cooling width of local cooling can be expressed as a mist width. The mist width increases as the outer diameter of the gas injection port increases, and also changes depending on the pressure of air injected from the gas injection port. In addition, since the mist generated by the cooling nozzle is generally sprayed while spreading, the mist width increases as the height of the cooling nozzle increases. Therefore, the method of changing the height of the cooling nozzle is effective as means for adjusting the cooling width of local cooling. In this case, if the height of the cooling nozzle is too high, the cooling width is increased, the linearity of the crack is deteriorated, and the crack is likely to be bent. Conversely, if the height of the cooling nozzle is too low, it becomes difficult to generate a desired mist due to the backflow of air. In the case of the cooling nozzle illustrated in FIG. 3, the height is usually preferably within about 10 mm, and particularly preferably about 2 to 5 mm.

  In addition, since the mist width can be easily controlled as the cooling nozzle, typically, the liquid nozzle and the gas nozzle are preferably circular. However, it is also possible to use a nozzle having an elliptical shape, for example, as the liquid jet port and the gas jet port so that the major axis thereof coincides with the virtual cutting line. The purpose of the cooling nozzle can be achieved by itself, but a plurality of cooling nozzles may be used in series in the virtual tangential direction.

  Thus, the type of cooling nozzle in which the liquid jet port protrudes from the gas jet port is excellent in that it can generate a mist with a small cooling width as described above, thereby improving the linearity of the crack. However, the cooling nozzle is not limited to such a protruding type. For example, although not shown in the figure, liquid and gas may be mixed and misted inside the nozzle, and the generated mist may be ejected from the ejection port.

  In this invention, the laminated glass in which the crack was formed along the virtual cut line of both surfaces by local cooling is then bent by giving a bending moment to this crack part, for example. Since this splitting is substantially the same as the conventional method of splitting along the cutting line made by the cutter, description thereof will be omitted, but for the purpose of reducing chipping defects occurring at the time of splitting, a bending moment applying method and applying You may adjust a direction suitably.

  In this invention, the cutting device provided with the cutter, the heating burner, and the cooling nozzle is installed facing both sides of the laminated glass to be cut. Specifically, a cutter, a heating burner, and a cooling nozzle are arranged in series in this order from the downstream side in the cutting direction on the virtual cutting line of the laminated glass, and are cut relative to the laminated glass at a predetermined speed. Either of the relative movements may be moved, but in order to facilitate the setting of the cutting position of the laminated glass and to reduce the cutting space, it is preferable to move the cutting device relative to the laminated glass.

  In the above arrangement, the installation position of the cutter does not have to be set strictly if it is downstream of the heating burner, but the distance from the heating burner to the cooling nozzle depends on these heating and cooling conditions, and the glass plate to be cut. Depending on the plate thickness, cutting speed, etc., the cracks necessary for cutting are appropriately set so as to be formed at a desired depth. Here, the depth of the crack is preferably 7% or more of the thickness of the glass plate to be cut. If the depth of the crack is shallower than 7% of the plate thickness, it is difficult to break even if a bending moment is applied, which may cause breakage.

The depth of this crack can be conveniently adjusted by changing the distance from the heating burner to the cooling nozzle. Specifically, the crack can be deeply formed by increasing the distance between the heating burner and the cooling nozzle. However, if this interval is longer than necessary, the glass surface temperature in the vicinity of the virtual cutting line at the time of local cooling becomes lower than 83 ° C., so that a crack with a desired depth cannot be formed. This interval can be determined in consideration of the relative transfer speed (cutting speed) between the laminated glass and the cutting device, the thickness of the glass plate, the heating and local cooling conditions by the burner combustion flame, and the like. In a preferred embodiment of the present invention, at least one of the heating burner and the cooling nozzle is laminated glass so that the distance from the heating burner to the cooling nozzle can be changed and the time from heating to local cooling can be easily adjusted. It is installed so that the position can be adjusted in the direction of the virtual cutting line. Usually, it is preferable to make the position of the cooling nozzle variable.
In the present invention, the cut starting point of the virtual cut line of the laminated glass is cut into a crack starting point, heated by the combustion flame of the heating burner along the virtual cut line, and then the surface becomes the virtual cut line. A step of forming a crack by being locally cooled along, a step of folding the crack portion by applying a bending moment, for example, and a step of cutting the adhesive layer. After performing the step of forming, the step of splitting both sides may be performed, the step of forming a crack on one side and the step of splitting, and then the step of forming a crack on the other side A step of folding may be performed. In the step of forming cracks on both sides, a crack may be formed simultaneously on both sides, or after forming a crack on one side, a crack may be formed on the other side.

  Next, an embodiment of a laminated glass cutting device according to the present invention will be described with reference to the drawings. However, the present invention is not limited to this embodiment and drawings. FIG. 1 is a plan view of a laminated glass cutting device as a preferred embodiment of the present invention, and FIG. 2 is a front view of a cutting portion in the cutting device of FIG.

  In this example, as shown in FIG. 2, cutting devices for cutting the upper glass plate and the lower glass plate are installed opposite to each other on the upper and lower sides of the cutting table 22, and placed on the cutting table 22. In this case, the cutting device is moved with respect to the laminated glass 1 for cutting. The cutting device is disposed substantially symmetrically on both sides (up and down) of the laminated glass 1 placed on the cutting table 22, and while moving almost simultaneously along the virtual cutting line of the laminated glass 1, A cutting device installed on the upper side of the cutting table 22 cuts the upper glass plate of the laminated glass 1, and a cutting device installed on the lower side of the cutting table 22 cuts the lower glass plate. For this purpose, the notch 22 is provided with a notch 27 along the moving path of the cutting device as shown in FIG. 1, and the cutting device installed below the notch 22 removes the notch 27. The glass plate below the laminated glass 1 can be cut by passing therethrough. Although the notch 27 is schematically shown in FIG. 1, it extends from the both ends of the laminated glass 1 to the left and right by at least the width of the lower cutting device. In this example, since the structure of the cutting device respectively arrange | positioned at the upper and lower sides of the laminated glass 1 is substantially the same, it demonstrates below, representing the upper cutting device, and the description of a lower cutting device is abbreviate | omitted. However, when the thickness of the two glass plates constituting the laminated glass is different, various settings of the heating burner 3 and the cooling nozzle 4, their feed speed (cutting speed), etc. are respectively set by the upper and lower cutting devices. It may be different.

  As shown in FIG. 1 and FIG. 2, in the cutting apparatus, the cutting base 9 is installed on the upper side of the cutting base 22 in the same direction as the notch 27, and the cutting direction of the glass 1 (arrow) is aligned with the cutting base 9. The cutter 2, the heating burner 3, and the cooling nozzle 4 are attached in this order from the downstream side in the direction). Specifically, the cutter 2 and the heating burner 3 are respectively attached to the attachment plate 28 by the cutter base 10 and the burner holding member 11, and are attached to the cutting base 9 through the attachment plate 28. The cooling nozzle 4 is attached to the cutting base 9 by a nozzle holding member 12. The cutter 2, the heating burner 3, and the cooling nozzle 4 can be moved on the cutting base 9 in the same direction and at the same speed by a motor 29. In this state, the cutter 2, the heating burner 3 and the cooling nozzle 4 are arranged in series in a straight line, and when moved on the cutting base 9 by the motor 29, the laminated glass placed on the cutting base 22. 1 runs along the virtual cutting line 7, and the laminated glass 1 is cut along the virtual cutting line 7.

  That is, the cutter 2, the heating burner 3, and the cooling nozzle 4 are waiting on the left side (upstream side) of the cutting base 22 in FIG. 1, and the laminated glass 1 is virtually placed on the cutting base 22 at the cutting position of the cutting device. After the cut lines 7 are put together and placed on the cutting base 9 by the motor 29 at a predetermined speed in the direction of the arrow, the upper surface of the laminated glass 1 is precisely the upper surface of the upper glass plate of the laminated glass 1. First, the cutter 2 cuts the cut 5 at the cutting start point of the virtual cut line 7 of the laminated glass 1, and then the heating burner 3 heats along the virtual cut line 7 from the portion where the cut 5 is made, The cooling nozzle 4 locally cools the heated portion along the virtual cutting line 7. Thereby, the crack required for a cutting | disconnection can be formed in the upper glass plate of the laminated glass 1 along the virtual cutting line 7 from the said cut 5 and can be formed. Below, the cutter 2, the heating burner 3, and the cooling nozzle 4 are explained in full detail.

  In this example, the cutter 2 uses a diamond wheel which is widely used for glass cutting for convenience. The cutter 2 is attached to the operating end of the air cylinder 8 attached to the cutter base 10. When the cutter 2 moves to the end that is the cutting start point of the laminated glass 1, the air cylinder 8 is operated. The laminated glass 1 descends to the end of the virtual cut line 7, and a cut 5 having a length of about 5 to 10 mm and a depth of about 50 to 150 μm is cut into the end of the virtual cut line 7 in the direction of the virtual cut line 7. Thereby, the fine crack used as the starting point of the crack required for a cutting | disconnection is formed in the glass of the part by which the cut 5 of the upper side glass plate of the laminated glass 1 was made | formed. In this case, since the pressurization of the cutter 2 necessary for engraving the cut 5 is not so large, horizontal cracks that cause cullet are not substantially generated in the glass of the cut 5. The cutter 2 having the cut 5 is raised by the air cylinder 8 and waits for the next cutting of the laminated glass. The raising and lowering of the cutter 2 can be automatically controlled by the control device of the cutting device.

As the heating burner 3, an oxygen / city gas premixed burner is preferably used. The heating burner 3 is attached to an attachment plate 28 by a burner holding member 11 on the upstream side in the cutting direction of the cutter 2. The heating burner 3 runs along the cutting base 9 together with the cutter 2 and has a cut 5 formed by the cutter 2. The laminated glass 1 is heated along the virtual cutting line 7 from the portion.
The combustion port portion of the heating burner 3 is formed by a number of flame ports 23 arranged in series at a predetermined pitch as schematically shown in FIG. In this case, the size, pitch, number of pieces in series, and the like of the flame opening 23 can be determined mainly by the thickness of the glass plate to be cut and the moving speed of the heating burner 3. Incidentally, the heating burner 3 of this example includes a combustion port portion having a length of about 113 mm, in which 50 flame ports 23 having a diameter of 0.6 mm are arranged in a straight line with a pitch of 2.3 mm. In the heating burner 3 of this example, the combustion port portion is installed at a height of about 7 mm from the surface of the laminated glass 1, and the virtual flame of the laminated glass 1 is caused by the combustion flame 24 while traveling on the cutting base 9. The cut line portion is continuously heated to a predetermined heating width and heating temperature. The height of the heating burner 3 can be appropriately adjusted by the height adjusting means 31 as necessary.

  Further, when the heating burner 3 is moved and heated with respect to the laminated glass 1 as in this example, in order to eliminate the influence of wind on the combustion flame 24 when the heating burner 3 is moved, the heating burner 3 is moved in front of the heating burner 3. A windshield cover 30 is preferably provided. The material and shape of the windshield cover 30 are not limited. For example, a cover in which a silica cloth excellent in heat resistance and fire resistance is stretched on an aluminum frame 33 fixed to the burner holding member 11 can be preferably used. In this case, the gap between the windshield cover 30 and the laminated glass 1 is preferably as narrow as possible, and is usually about 0.5 to 1 mm. Further, as shown in FIG. 1, it is preferable to cover at least the outer end of the heating burner 3 with silica cloth. In addition, when the laminated glass 1 is moved and heated, the combustion flame 24 is hardly affected by the wind, so that there is no need for the windshield cover.

  On the other hand, the cooling nozzle 4 is attached to the cutting base 9 by a nozzle holding member 12 so that the lower end of the cooling nozzle 4 is about 2 mm above the upper surface of the laminated glass 1. The cooling nozzle 4 has the same structure as that illustrated in FIG. 3. The virtual cutting line heated by the heating burner 3 is locally cooled by the mist 26, and cracks necessary for cutting are cut along the virtual cutting line 7. Extend. The cooling nozzle 4 of this example includes a gas ejection port 19 (outer diameter: 0.9 mm) outside the liquid ejection port 18 (inner diameter: 0.2 mm) at the center of the nozzle. It protrudes 0.5 mm from the gas injection port 19. A water supply pipe 20 and an air supply pipe 21 are connected to the liquid jet port 18 and the gas jet port 19 of the cooling nozzle 4 (see FIG. 3), respectively, and normal temperature water supplied from the water feed pipe 20 is centered on the nozzle. A mist 26 is generated by jetting a constant flow rate from the liquid jet port 18 at the same time, and simultaneously jetting compressed air sent from the air feed pipe 21 through the gas jet port 19. The generated mist 26 locally cools the heated virtual cut line portion of the laminated glass 1 with a width of about 2 mm.

  This local cooling is performed as follows. That is, when the cooling nozzle 4 moves and reaches the laminated glass 1, the mist 26 is sprayed onto the laminated glass 1 from the cooling nozzle 4, and local cooling is started from the cut line 5 of the virtual cut line portion heated by the heating burner 3, Thereafter, the cooling is continuously performed along the virtual cutting line 7 as the cooling nozzle 4 moves. Thereby, the virtual cut line 7 part of the laminated glass 1 is efficiently cooled with a width of about 2 mm, and the glass in this part is subjected to a large thermal shock by rapid cooling and generates a tensile stress. As a result, fine cracks formed by the cuts 5 extend in the vertical direction by the action of this stress. Further, this crack continuously extends along the virtual cutting line 7 from the cut 5 as a starting point, and forms a crack 6 (see FIG. 1) necessary for cutting. Since the crack 6 has a predetermined depth, the laminated glass 1 can be easily broken by, for example, a bending moment.

  The cooling nozzle 4 is preferably provided on the cutting base 9 so that the position can be adjusted. If the position of the cooling nozzle 4 is thus variable, the time from the heating by the heating burner 3 to the local cooling can be easily changed by changing the distance from the heating burner 3. The depth can be adjusted as appropriate. Furthermore, the cooling nozzle 4 can change the height from the glass surface by adjusting means 32 as required.

  The upper cutting device installed opposite to the upper side and the lower side of the cutting table 22 has been described above. However, the lower cutting device is different from the upper cutting device only in the installation direction as described above. It is substantially the same as the device. Therefore, the lower cutting device operates in the same manner as the upper cutting device, and similarly forms a crack along the virtual cutting line 7 in the lower glass plate of the laminated glass 1. In a preferred embodiment of the present invention, these upper and lower cutting devices are operated synchronously by the control device, so that the crack 6 is put on the upper glass plate and the lower glass plate constituting the laminated glass 1 and the virtual cutting line 7 of the laminated glass 1. Can be formed substantially simultaneously. This is the same when the laminated glass 1 is transferred and cut between a pair of cutting devices installed opposite to each other. Although the production efficiency is low but stable cutting conditions are easily obtained, the start timing of forming cracks on the upper and lower surfaces in the synchronous operation of the upper and lower cutting devices may be changed, or cracks are formed and folded on one surface. Later, a crack may be formed on the other surface and then folded.

  In the present invention, the laminated glass 1 in which the crack 6 is formed along the virtual cutting line 7 is bent by applying a bending moment to the crack portion. This folding method has the same principle as the conventional cutting of laminated glass, and the method is not limited. As one of them, the upper glass plate constituting the laminated glass and the crack portion of the lower glass plate are given different bending moments, for example, the upper glass plate is first folded, and then the lower glass plate. An example of a method for folding the frame is illustrated. The bending moment may be applied manually or mechanically. The cracks generated in the laminated glass according to the present invention are deeper in the vertical crack than the cut line made by the cutter, and the horizontal crack does not occur, so it can be broken by a small bending moment or impact, and the occurrence of cullet is reduced. Advantages such as being able to be suppressed, improving the workability of splitting, and obtaining a high-quality laminated glass with a good cut end surface are obtained.

In cutting laminated glass, even if the glass plate is folded, the broken glass plates are connected by the adhesive layer, so that the adhesive layer needs to be cut in the same manner as in the past laminated glass. The cutting of the adhesive layer can be appropriately performed by a known method. Specifically, the adhesive layer is heated to be melted or cut by cutting the adhesive layer with a cutter.
Conventionally, in any method, the adhesive layer is heated and softened by heating the folded portion (hereinafter referred to as the cut portion) of the laminated glass that has been broken, and in this state, the glass plates on both sides are pulled in the plate direction. The adhesive layer is stretched by applying force to create a gap in the glass plate of the cut part, and when fusing, the adhesive layer is heated and melted from this gap part, and when cutting with a cutter, Run to cut.

  In this way, when cutting with a conventional cutting device with a cutting line in the cutting direction with a cutter, it must be heated to heat and soften the adhesive layer during or after the folding of the glass plate (Patent Document 1 and Patent Document 2). In order to heat the adhesive layer through the glass plate, this heating requires a considerable heating time. For example, in the case of laminated glass in which two 3 mm glass plates are bonded with a 0.76 mm PVB film, the adhesive layer is bonded with a halogen lamp. It takes about 20 seconds to heat until the softens. This heating of the adhesive layer lengthens the time for cutting the laminated glass and causes a decrease in productivity.

On the other hand, in the present invention, the virtual cut line portion of the laminated glass is heated to, for example, 130 ° C. or more with a heating burner, and since it is heated from both sides of the laminated glass, the adhesive layer of the virtual cut line portion is sufficiently heated and softened by this heating. Can be made. Therefore, it is not necessary to heat only the softening of the adhesive layer after cutting the two glass plates constituting the laminated glass. When the glass plate is folded, the adhesive layer is already heated and softened. Simultaneously with the splitting, the adhesive layer can be extended to create a gap in the cut portion, and the adhesive layer can be immediately cut.
Even if it takes time to heat the burner at the time of cutting the glass plate, the heating work only for the purpose of softening the adhesive layer can be omitted, so the total cutting time of the laminated glass is shortened compared to the conventional method and productivity is improved. it can.

  Furthermore, when fusing the adhesive layer in the present invention, one or both of the heating burners of the vertical cutting device can be used as appropriate. Specifically, after the cut portion of the laminated glass 1 that has been broken in FIGS. 1 and 2 is aligned with the cutting position of the cutting base 22, the heating burner 3 is caused to travel along the cutting base 9 so that the burner The adhesive layer can be heated and melted. Of course, the method for fusing the adhesive layer is not limited to this, and other heating means may be used.

  When the cut laminated glass is cut in the second direction in the direction orthogonal to the cut end following the first cut, in the conventional method, the second cut line 13 is cut with a cutter as shown in FIG. , The straight end of the crack is impaired at the cut end portion 35 heated in the first cutting, meandering and breaking may occur, and the production yield may be reduced. Particularly in winter when the temperature is low, the temperature difference between the cut end portion 35 and the second cut line portion is large, so that the cutting breakage increases. As a preventive measure, the second cutting is performed after the temperature of the cutting end portion 35 is lowered.

  In the cutting method of the present invention, as shown in FIG. 7B, the cutting part 36 is burner-heated for the second cutting, so even if the cutting end 35 is heated in the first cutting, the temperature difference Almost disappears. Thereby, cutting breakage is reduced and the yield is improved.

  Prepare 2 sheets each of float glass sheets (FL2, FL3) and 4mm glass sheets (F4) with a thickness of 2mm and 3mm as laminated base plates, and the two glass sheets with the same thickness are 0.76mm thick. A laminated glass (sample) was prepared by bonding with a (30 mil) PVB film, and these samples were cut (crack formation) using the cutting apparatus of FIG. 1, and the crack formation state of each sample was visually evaluated. . The cutting of each sample is the same as the cutting start point of each sample by moving the cutter, heating burner and cooling nozzle of the cutting apparatus installed above and below the sample synchronously at a cutting speed of 0.6 m / sec. A cut having a depth of about 100 μm and a length of about 7 mm is cut with a diamond wheel under the cut formation conditions, and then the virtual cut line of each sample is heated with a burner (premixed burner) under the next cutting conditions and then heated. The virtual cut line portion was locally cooled by a mist from the cooling nozzle along the virtual cut line with a width of about 2 mm to form a crack.

Table 1 shows the evaluation results of the crack formation state of each sample. In Table 1, gas / O ₂ is the amount of gas supplied from the heating burner (city gas) and oxygen gas, L is the distance between the heating burner and the cooling nozzle, and the visual evaluation of the crack formation state is based on the following criteria: A total of two upper and lower glass plates were used.
(Crack evaluation criteria)
A: Particularly good crackable crack (those with sufficient depth and excellent linearity)
○: Cracks that can be broken (partially two cracks or a small amount of glass powder on the crack surface, but it can be broken and has no practical problem)
(Cutting conditions)
a. Heating burner: Height (distance between burner and glass plate) 5mm
b. Cooling nozzle: cooling nozzle of FIG. 3 (a: 0.23 mm, b: 0.9 mm, c: 0.5 mm, d: 0.05 mm)
・ 2 used
・ Nozzle height 2mm
・ Water volume from the liquid spout 4ml / min
・ Air pressure from gas injection port 0.24MPa
c. Plate temperature: 19.4 ° C (temperature 19.1 ° C)

  As can be seen from Table 1, it was confirmed that any of Examples 1 to 4 had cracks that could be broken. Further, in Examples 1 to 4, all the samples were heated to 130 ° C. or higher by the heating burner, and the glass surface temperature in the vicinity of the virtual cutting line at the time of local cooling was 83 ° C. or higher.

  Furthermore, when a bending moment was applied to the crack portion of each sample in Examples 1 to 4, the two glass plates could be folded with good linearity, and the adhesive layer was stretched without further heating only the adhesive layer. Then, the adhesive layer was cut with a cutter, and the laminated glass as a sample could be cut.

  In Examples 1 to 4, cutting (crack formation) was performed simultaneously at the top and bottom, but after the crack formation was engraved in the upper glass plate, the following time (start of cutting) was taken until the crack formation was engraved in the lower glass plate. After cutting with a time difference), the cutting state was evaluated. In this example, a 3 mm float glass plate (FL) was used as the laminated base plate. The cutting conditions were the same as in Examples 1 to 4 except that the height of the heating burner was 7.5 mm, and the same cracking as in Examples 1 to 4 was performed by changing the cutting start time difference to 5 sec, 10 sec, and 15 sec. Evaluation was based on the evaluation criteria. Table 2 shows the evaluation results of the crack formation state of each sample. The plate temperature and air temperature were measured and recorded each time.

As is clear from Table 2, it was confirmed that any of Examples 5 to 7 had cracks that could be broken. Further, in Examples 5 to 7, all the samples were heated to 130 ° C. or higher by the heating burner, and the glass surface temperature in the vicinity of the virtual tangential line at the time of local cooling was 83 ° C. or higher.
Furthermore, as shown in Example 5, the difference in cutting start time is fixed at 5 sec, and the results of evaluating the cutting state by changing the glass type are shown in Table 3. The cutting conditions and crack evaluation criteria were the same as those in Examples 5 to 7.

  Here, FL3-60-FL3 is a laminated glass obtained by bonding two 3 mm float glass plates with a 1.52 mm (60 mil) PVB film, and F3-45-FL3 is a glass plate with a thickness of 3 mm and two float glass plates. Laminated glass bonded with 14 mm (45 mil) PVB film, FL2-60-F4 is a laminated glass in which two sheets of 2 mm float glass and 4 mm template glass are bonded with 1.52 mm (60 mil) PVB film, FL5- 60-FL5 is a laminated glass obtained by bonding two 5 mm float glass sheets with a PVB film of 1.52 mm (60 mil).

As apparent from Table 3, it was confirmed that any of Examples 8 to 11 had cracks that could be broken. In Examples 8 to 11, any sample was heated to 130 ° C. or higher by the heating burner, and the glass surface temperature near the virtual tangent line at the time of local cooling was 83 ° C. or higher.
Furthermore, when a bending moment was applied to the crack portion of each sample of Examples 5 to 11, the two glass plates could be folded with good linearity, and the adhesive layer was stretched without further heating only the adhesive layer. Then, the adhesive layer was cut with a cutter, and the laminated glass as a sample could be cut.

  According to the present invention, a cutting device is installed on both sides of the laminated glass so as to face each other, and by using a combination of heating by a combustion flame of a heating burner and local cooling by mist, micro cracks incised in the vicinity of the cutting start point Since the crack necessary for cutting can be formed along the virtual cutting line, the laminated glass can be efficiently cut with high quality without making a cutting line with a cutter. Thereby, this invention is applicable to the cutting | disconnection of various laminated glasses, such as an object for construction, vehicles, and industry.

  The entire contents of the specification, claims, drawings, and abstract of Japanese Patent Application No. 2005-164345 filed on June 3, 2005 are incorporated herein as the disclosure of the specification of this application. Is.

Claims (14)

  A method for cutting a laminated glass in which two glass plates are bonded with an adhesive layer, wherein a cutter, a heating burner, and a cooling nozzle are installed facing each other on both sides of the laminated glass. In this case, a cut which becomes a crack starting point is cut with a cutter in the vicinity of the cutting start point of the virtual cutting line, and the surface of the laminated glass is heated from the cutting part along the virtual cutting line by a combustion flame of a heating burner, By locally cooling the heating part with a mist from a cooling nozzle with a width of 1 to 20 mm along a virtual cut line, a crack necessary for cutting is formed from the cut part of the glass plate along the virtual cut line. A method for cutting a laminated glass, characterized in that the adhesive layer is cut after breaking along the crack.   A method for cutting a laminated glass in which two glass plates are bonded with an adhesive layer, wherein a cutter, a heating burner, and a cooling nozzle are installed on both sides of the laminated glass so as to face each other, and both sides of the laminated glass are virtually After cutting each of the cut starting points near the cutting start point of the cut line with a cutter, both sides of the laminated glass are heated from the cut part along the virtual cut line by a combustion flame of a heating burner, and then both sides are heated. By locally cooling the part with a mist from a cooling nozzle along a virtual cutting line with a width of 1 to 20 mm, a crack necessary for cutting is formed from the cut part of the two glass plates along the virtual cutting line, respectively. A method for cutting laminated glass, comprising: cutting a glass sheet along each of the cracks and then cutting the adhesive layer.   A method for cutting laminated glass in which two glass plates are bonded with an adhesive layer, wherein a crack necessary for cutting is formed on one side of the laminated glass along a virtual cut line from a cut portion of the glass plate, A crack necessary for cutting is formed along the virtual cut line from the cut portion of the glass plate on the other surface, and the adhesive layer is cut after the crack is broken along the crack. The cutting method of the laminated glass of description.   The glass surface temperature immediately after heating is such that the maximum heating temperature near the virtual cutting line is 130 ° C. or higher, and the left and right average temperatures at both ends of the 10 mm width centering on the virtual cutting line are equivalent to 45% or more of the maximum heating temperature. The cutting method of the laminated glass in any one of Claims 1-3 which heats both surfaces of a laminated glass, respectively.   The cutting method of the laminated glass in any one of Claims 1-4 which performs the said local cooling in the state whose glass surface temperature of the virtual cutting line vicinity is 83 degreeC or more.   The method for cutting laminated glass according to any one of claims 1 to 5, wherein a maximum heating temperature in the vicinity of the virtual cutting line is 130 to 220 ° C.   The method for cutting laminated glass according to any one of claims 1 to 6, wherein a cooling width by mist is 1 to 10 mm.   The laminated glass according to any one of claims 1 to 7, wherein the local cooling is performed by a cooling nozzle provided with a gas injection port on an outer periphery of a liquid injection port in a central portion of the nozzle and protruding from the gas injection port. Cutting method.   The laminated glass according to any one of claims 1 to 8, wherein the depth of the crack is adjusted by changing the time from the heating by the heating burner to the local cooling by the cooling nozzle to change the glass surface temperature at the time of the local cooling. Cutting method.   The method for cutting laminated glass according to any one of claims 1 to 9, wherein heating and local cooling are performed by moving the heating burner and the cooling nozzle along virtual cut lines on both surfaces of the laminated glass placed on a cutting board. .   A cutter for engraving a cut that becomes a crack starting point near the cutting start point of the virtual cut line of the laminated glass, a heating burner for heating the laminated glass from the cut part along the virtual cut line by a combustion flame, and heating Cooling nozzles for generating a mist for locally cooling the virtual cut line portion are installed on both sides of the laminated glass in this order from the downstream side in the cutting direction, and the heating burner follows the virtual cut line from the cut portion. After heating to a predetermined heating width and heating temperature, the heated virtual cut line part is locally cooled with a predetermined width by mist from the cooling nozzle, and cracks are formed on both surfaces of the laminated glass from the cut part along the virtual cut line. A laminated glass cutting device characterized by being produced.   The laminated glass cutting device according to claim 11, wherein the cooling nozzle includes a gas ejection port on an outer periphery of a liquid ejection port in a central portion of the nozzle, and the liquid ejection port protrudes from the gas ejection port.   The cutting apparatus of the laminated glass of Claim 12 whose protrusion amount c of the liquid jet nozzle of the said cooling nozzle is 0 <c <= 20mm.   An inner diameter a of the liquid nozzle of the cooling nozzle is 0.15 to 0.6 mm, and an outer diameter b and an inner diameter b ′ of the gas nozzle satisfy a relationship of bb ′ = 0.05 to 1.45 mm. Item 14. A laminated glass cutting device according to any one of Items 11 to 13.

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