JP5541449B2 - Thin glass or processing method of glass laminate including thin glass - Google Patents

Description

  The present invention relates to a method for processing laminated glass, which is a laminated glass using thin glass or the thin glass.

  Water jet machining has been developed, and is now widely known as a machining method useful for cutting other than conventional wheel cutting. In particular, it demonstrates its ability when cutting composite materials with different strength and friction. The target materials range from metals, stones, wood, plastics, and so on. At present, an abrasive type in which abrasive grains are drawn into a high-pressure water stream is mainly used for water jet processing because of its high grinding force.

  For example, Patent Document 1 includes a substantially vertical portion in which the nozzle-side abrasive supply tube is temporarily raised upward from the nozzle head mounting portion, and below the top of the vertical portion, at the start of processing, for a predetermined time from jet injection ON. There is a disclosure of a water jet machining apparatus provided with an on-off valve that is controlled to open quickly and close at a predetermined time earlier than jet injection OFF when machining is completed. With this processing device, it is possible to prevent the occurrence of defects during piercing of workpieces such as soft metals such as aluminum and laminated resin, and for brittle materials such as glass and ceramic stone materials in combination with water pressure control during piercing. The cracking of the material can be prevented. Further, the negative pressure at the time of jet injection OFF can prevent the abrasive from flowing into the nozzle head, thereby preventing the orifice from being damaged.

  Further, Patent Document 2 includes an abrasive supply orifice and a flow rate adjusting orifice of an abrasive water jet, and the discharge of the abrasive material from the abrasive tank is mainly due to gravity and the flow rate adjusting valve or the opening of the orifice. Discloses a method for supplying an abrasive material to a water jet flow. This method improves the grinding efficiency and makes it possible to control the roughness of the machined surface in the abrasive water jet grinding.

  Further, in Patent Document 3, when cutting laminated glass with an abrasive water jet, small-diameter particles that are cutting waste of waste sand discharged after use are laminated glass such as glass to be cut and polyvinyl butyral. There is a disclosure of an invention that includes a resin for use and abrasive powder crushed by a cutting impact, and classifies and reuses them.

  Further, Patent Document 4 discloses an invention in which when cutting with an abrasive water jet, the abrasive grain size is set to 100 μm or less, thereby extending the life of the nozzle and reducing the cutting width by abrasive grinding. is there.

  Further, Patent Document 5 effectively suspends abrasive particles, forms a stable abrasive water jet jet, cuts with high efficiency and a narrow cut width, and can be reused. There is an invention disclosure made with the aim of providing a premixed suspension of a reusable polymer-enriched jet stream that reduces waste disposal requirements and raw material costs. The content of the suspension is an abrasive water jet jet suspension using an abrasive having a particle size of about 2 μm to about 1400 to 1600 μm, further about 20 to about 200 μm, preferably about 20 to about 80 μm. Is preferably about 1 to about 75% by weight abrasive, often about 5 to about 50%, preferably about 15 to about 30%.

  Moreover, the laminated glass which is a laminated body of plate glass generally has a resin film sandwiched between two plate glasses. Laminated glass has higher durability against breakage and penetration than single pane glass, and is often used as a window material for buildings and vehicles. In recent years, laminated glass having additional characteristics such as heat ray reflectivity and soundproofing has been commercialized by means such as resin and film formation.

  New laminated glass with improved functions is still being developed. In general laminated glass, a plate glass having a thickness of 2 to 5 mm is bonded via a resin film. However, there is a case where anxiety is caused in penetration resistance and cut safety. For example, Patent Documents 6 and 7 disclose the latest invention of laminated glass that uses thin sheet glass for laminated glass, has high penetration resistance, and does not scatter broken pieces even if the glass breaks. .

JP-A-5-301166 Japanese Patent Laid-Open No. 7-024737 JP 2001-79443 A Japanese Patent Laid-Open No. 62-193799 JP-T 9-502664 Publication JP 2008-308400 A JP 2009-96715 A

  However, when a laminated glass containing thin glass as described in Patent Documents 6 and 7 is cut with a general abrasive water jet machining apparatus, cracks are generated in the thin glass. When cracks are formed in the laminated glass, not only the beauty is impaired, but there is a problem that the cracks progress and the strength such as penetration resistance is lowered.

  Patent Documents 1 and 2 relate to the control of water jet injection and the control of the supply amount of the abrasive, and there is no disclosure regarding the cutting of the thin glass. In addition, the abrasive water jet cutting technique described in Patent Document 3 relates to abrasive grain recovery, and is effective in reducing processing costs and suppressing the influence on the environment. However, it does not give any suggestion to the problem of cutting a fragile material such as thin glass without cracking, and does not solve the problem in this case. Furthermore, Patent Documents 4 and 5 have a statement that fine abrasive grains are used. However, in Patent Documents 4 and 5, a suspension obtained by mixing abrasive grains with water is supplied to a high-pressure water jet. Since stirring of the liquid becomes difficult, fine abrasive grains are used, and there is no description regarding prevention of cracking and cutting property of the thin glass.

  The present inventors tried to change various conditions on the apparatus such as the spraying of the abrasive water jet and the scanning speed of the nozzle for the above problems, but all of them basically avoid the problem of cracking of the thin glass. I couldn't.

  In view of such a situation, the present invention is capable of cutting, grooving, chamfering, and the like capable of cutting the thin glass without generating cracks even when the thin glass and the laminated glass include the thin glass. It is an object to provide a processing method.

  The present inventors performed a cutting test by changing various conditions on the apparatus in order to perform processing including cutting of the thin glass without cracks on the thin glass and the laminated glass with the thin sheet by the abrasive water jet processing apparatus. It was. Among them, I got a clue that led to this invention. That is the opposite of what is generally accepted. Specifically, when the scanning speed of the spray nozzle was slowed, cracks did not decrease but increased on the contrary. For this reason, we have come to realize that it is only necessary to prevent the collision of coarse particles, not to reduce the collision energy of coarse particles, to prevent cracks. And it came to the conclusion that it should just adjust paying attention to the coarse grain in an abrasive grain for the collision prevention of a coarse grain.

  Therefore, as a result of detailed adjustment of the grain size of the abrasive grains and investigation of the necessary conditions, the present inventor paid attention to the thickness of the thinnest glass sheet contained in the thin glass or laminated glass containing the thin glass, and the abrasive water jet It is found that the problem can be achieved by adjusting the grain size of the abrasive grains constituting the suspension sprayed at high pressure from the nozzle of the processing apparatus to a predetermined range with respect to the thickness of the thin glass sheet, and the present invention is provided here.

  In the processing method of the thin glass or the glass laminate including the thin glass according to the present invention, the abrasive glass is mixed into the thin glass having a thickness of less than 1.0 mm or the glass laminate including the thin glass by an abrasive water jet processing apparatus. A processing method for performing processing including high-pressure jetting of a suspension to cut the thin glass, wherein the maximum grain size is adjusted to a ratio of 0.50 or less with respect to the thickness of the thinnest thin glass. It is characterized by using.

  As the abrasive grains used in the present invention, it is possible to use an inorganic powder in which the maximum particle diameter is adjusted so that the ratio does not exceed 0.50 with respect to the thickness of the thin glass sheet or the thinnest glass sheet of the glass laminate. This is important for preventing the thin glass from cracking during grinding with abrasive grains in the water jet. Specifically, the maximum particle size is 0.50 or less for a thickness of less than 1.0 mm of the thin glass, that is, abrasive grains having a maximum particle size of less than 500 μm for a thickness of less than 1000 μm are used. I mean.

  In the processing method of the present invention, performing processing including cutting of thin glass includes not only cutting of thin glass and a glass laminate including the same, but also groove processing or chamfering processing for cutting the thin glass in the glass laminated body, etc. This means that this is also a target.

  In addition, it is possible to use an inorganic powder having an average particle size adjusted to a ratio of 0.30 or less with respect to the thickness of the thin glass sheet or the thinnest glass sheet of the glass laminate. It is preferable for stably preventing the thin glass from cracking.

  In the thin glass or glass laminate to be cut in the present invention, the type of glass is not particularly limited. That is, quartz glass, soda-lime glass, borosilicate glass, alkali-free glass, aluminosilicate glass, phosphate glass, and the like may be used. Each plate glass may be the same or different in material and thickness. The number of glass layers is not questioned.

  When the glass laminate to be cut in the present invention is a laminated glass joined using a resin, the type of the resin is not limited. An acrylic resin, a vinyl resin, a silicone resin, a polyimide resin, or the like may be used.

  It is preferable to place a thin glass or a glass laminate on the work fixing base of the abrasive water jet machining apparatus via a concavo-convex absorbent material made of an elastic material.

  The surface of the thin glass or glass laminate is started after jet injection is started outside the surface of the thin glass or glass laminate placed on the abrasive water jet processing apparatus, and after a certain period of time, the jet injection is stabilized. It is preferable to cut in to prevent large breakage around the injection point of the abrasive water jet.

  Since the processing method of the thin glass of this invention or the glass laminated body containing thin glass uses the abrasive grain which adjusted the maximum particle size to the ratio of 0.50 or less with respect to the thickness of the thinnest thin glass, thin glass or Even when the laminated glass includes thin glass, processing including cutting of the thin glass is possible without causing cracks in the thin glass.

Explanatory drawing of the abrasive type water jet processing apparatus used by this invention.

  Glass is a brittle material and has the property of being easy to crack and progress. In processing such as cutting, grinding, and polishing of plate glass, a small glass region is partially scraped off by continuous crushing or abrasion. At this time, when the processed portion is viewed microscopically, fine cracks are continuously generated. However, as long as the crack does not progress greatly and is peeled off from the plate glass of the material together with the glass micro-region, no crack remains in the processed plate glass.

  However, when the plate glass is thin by cutting with an abrasive water jet, the impact energy due to coarse grains having a maximum abrasive grain size exceeding 0.50 relative to the thickness of the plate glass is relative to the strength of the plate glass. Become bigger. In such a case, since the crack progresses rapidly and extends to the inside of the glass, the crack remains in the thin glass after cutting.

  In the present invention, as a result of examining the prevention of such cracks, if the ratio of the maximum grain size of the abrasive grains to the thickness of the thinnest glass sheet in the thin glass or glass laminate is 0.50 or less, It was found that substantially no cracks occurred. In addition, it is understood that when the ratio of the average grain size of the abrasive grains is 0.30 or less with respect to the thickness of the thinnest glass sheet in the thin glass sheet or the glass laminate, it is possible to stably realize the cutting process without generation of cracks. It was. If the particle size distribution of the abrasive grains is out of this range, the thin glass tends to break, which is not preferable.

  The removal of coarse abrasive grains is an essential requirement, but consideration should be given to fine powder. Although fine powder does not directly affect the occurrence of cracks, if too much fine powder is used, the abrasive force of the abrasive water jet jet will decrease, and cracks will occur in the plate glass due to insufficient grinding force at general nozzle scanning speeds. . At this time, cracking may be prevented by significantly reducing the cutting speed, but this is not practical in normal industrial production.

  Further, when the grinding force of the abrasive water jet spray is insufficient in the cutting process of the glass laminate, the jet spray is likely to enter between the plate glass layer and the resin layer. This is particularly likely to occur when the plate glass layer is thin or when the bonding strength between the plate glass layer and the resin layer is low. When the jet flow enters between the plate glass layer and the resin layer, there arises a problem that the joint surface is peeled off, or in the case of thin glass, the plate glass layer is pushed and bent.

  On the other hand, when the abrasive grains contain 50% by mass or more of fine powder having a particle size of 0.01 or less of the thickness of the thin glass layer, the above-mentioned grinding force is likely to be insufficient due to the fine powder. Therefore, it is preferable that the content rate of the fine powder which has a particle size of the ratio of 0.01 or less of the thickness of a thin glass layer is less than 50 mass% in the abrasive grain used by this invention. Specifically, the maximum particle size is 0.50 or less with respect to a thickness of less than 1.0 mm of the thin glass, that is, less than 50% by weight of abrasive grains having a maximum particle size of less than 10 μm with respect to a thickness of less than 1000 μm. It means that.

  Further, when the abrasive grains contain a lot of fine powder, aggregation is likely to occur, and clogging is likely to occur in the abrasive grain supply system and the injection nozzle. At present, a general abrasive water jet injects abrasive grains into a high-pressure water stream immediately before a jet injection nozzle to inject a mixed fluid of water and abrasive grains onto a cut sample. However, when the pulling-in of the abrasive grains is delayed due to factors such as agglomeration, the jet injection is an injection of water alone, and a hard material such as glass cannot be cut substantially.

  Specifically, the problem due to the aggregation is likely to occur when the average particle size of the abrasive grains is 10 μm or less, and when the average particle size is 1 μm or less, very careful attention is required for preventing the aggregation. In this case, as a measure for preventing agglomeration, consideration must be given to maintaining the dry state of the abrasive grains more than usual. Therefore, the abrasive grains used in the present invention preferably have an average particle diameter of 1 μm or more, and more preferably have an average particle diameter of 10 μm or more.

  A narrower particle size distribution is preferable. As long as it is in an allowable range that does not damage the glass, it is preferable that the abrasive grains are as large as possible. In this case, the grinding ability of the abrasive water jet injection is increased, and the efficiency of the cutting process is increased.

  Arbitrary methods can be applied to adjust the grain size of the abrasive grains. Garnet and other abrasives can be pulverized either dry or wet, and a ball mill, jet mill, or the like can be used as appropriate. Fine adjustment of the particle size is facilitated by confirming the particle size several times during the pulverization.

  When the pulverization is performed, if a coarse particle is extracted or a fine powder is classified and removed as appropriate, a predetermined particle size can be easily formed. It is also suitable as a method for adjusting the particle size to prepare individual powders having different particle size distributions in appropriate amounts.

  In order to reliably remove the coarse particles, it is preferable to use a sieve having an opening smaller by one step than the particle size of the coarse particles to be removed. In general, powder particles are not perfect spheres, and therefore particles having a particle size larger than the mesh size pass depending on the direction of the particles passing therethrough. Therefore, when a sieve having an opening of 50 to 80% of the particle size in question is used, coarse particles having a particle size in question can be almost completely removed.

  For removing coarse particles with a sieve, a dish-type sieve is sufficient for a small amount. However, when a large amount is used, it is more efficient to use a rotary-type sieve. At this time, if this is performed in a wet manner, dust is hardly generated, which is preferable in terms of the working environment.

  The most convenient way to adjust the ratio of coarse particles is to pass through a predetermined sieve. If the sieve is clogged, classification becomes impossible. Therefore, considering the workability of sieving, it is easier to adjust the particle size when the amount remaining on the sieve is somewhat small. When 50% or more of the volume is caught on the sieve, it is preferable to remove the coarse particles clogged in the sieve as appropriate.

  In order to efficiently prevent the coarse particles from being mixed into the abrasive grains and to efficiently adjust the proportion of the fine powders within a preferable range, the coarse particles may be appropriately removed with a sieve during the pulverization. And if only the removed coarse particles are individually pulverized, it is possible to prevent generation of more fine powder than necessary.

  In order to use the powder that has become too fine once again after coarsening, a process such as re-firing is required, which is very troublesome. Therefore, as a practical measure, it is preferable to leave a fine powder and mix it with the abrasive when it can be used.

  As an inorganic powder used for abrasive grains of an abrasive water jet, garnet corresponding to an old Mohs hardness of 8 is basically preferable. However, in the case of fine powder, the grinding force by the abrasive grains decreases, and therefore, the use of hard particles such as alumina, zirconia, and zircon corresponding to the old Mohs hardness 9 may increase the grinding force. However, in this case, since the wear of the injection nozzle and the like is increased during long-term use, attention should be paid to life management. Quartz crystals corresponding to the old Mohs hardness of 7 can also be used effectively when the grinding force is considered to be excessive, although the grinding force is low.

  In the cutting process using an abrasive water jet, cutting proceeds by continuous crushing of a minute region. A resin-like material is simply scraped off, but in a brittle material such as glass, micro-cracks are constantly generated in the jetting region. There is no problem when the microcracks are removed by scraping. However, if the cracks extend beyond the part to be scraped off, the cracks remain in the cut plate glass instead of falling on the cutting line. When the plate glass is cut, if there is a gap between the cut sample and the workpiece fixing base, the plate glass vibrates due to the impact of the abrasive water jet, and the generation of cracks and the progress of cracks are promoted. In particular, since thin glass has a low strength on a single plate, cracks tend to develop and remain due to impact and vibration caused by jet injection.

  For these reasons, in the cutting of thin glass or a glass composite material containing thin glass, the thin glass or glass laminate is interposed via an uneven absorber made of an elastic material in order to fill the gap between the work fixing base and the cut sample. It is preferable to place the body.

  The uneven absorbing material made of an elastic material described here is used to fill a gap between the cut sample and the work fixing base. At this time, if there is a concavo-convex absorbent material made of an elastic material, vibration due to this abrasive water jet injection is prevented and cracks are prevented. In addition, since the workpiece fixing base and the glass laminate are generally flat plate shapes, the uneven absorbent material may be a flat plate shape or a sheet shape. However, when the glass laminate has curvature or unevenness, the dimensional shape of the unevenness absorbing material may be determined in order to fill the gap between the workpiece fixing base and the cut sample.

  Although the thickness of the uneven absorbent material depends on the hardness of the elastic material, about 2 to 30 mm is appropriate. When it becomes thinner than 2 mm, the absorption width of the unevenness fluctuation becomes small. On the other hand, in the case of 30 mm or more, the fluctuation of the uneven absorbing material becomes large, and the fixation of the cut sample becomes unstable, which causes a crack.

  The elastic material of the uneven absorbent material may basically be an elastic body that can absorb the unevenness of the cut sample. Specifically, rubber and foamed resin are preferable. Alternatively, a thin futon in which a highly viscous liquid is placed in a tare may be used. With regard to hardness, an elastic material having a hardness comparable to that of general natural rubber can easily obtain the effect of preventing vibration by absorbing irregularities of a cut sample and is easy to use.

  In the cutting process according to the present invention, it is preferable that the abrasive water jet injection starts out of the surface of the laminated glass and cuts into the surface of the laminated glass after a certain time has passed and the jet has stabilized.

  When cutting is started from a portion where no hole is formed in the surface, such as in-plane cutting, damage may occur depending on the material and thickness. At present, the abrasive water jet machining apparatus has an operation mode for drilling called the piercing mode. When this operation is performed, the injection starts at a low pressure and the pressure is applied when the hole opens. It is possible to take measures to prevent destruction, such as raising the pressure to normal cutting. However, in the cutting of the laminated glass containing thin glass described in the present invention, this measure has no effect at all, and on the contrary, a large breakage occurs.

  Specifically, when jet injection is started in the plane of a glass laminate containing thin glass, fracture occurs in a circular shape having a radius of about 50 mm to about 200 mm around the jet injection point. Such a phenomenon is not seen in a general glass laminate and is greatly different. Examples of the related factors include elasticity and strength of a single glass plate, and adhesive strength of bonding (such as adhesive strength between a glass plate layer and a resin layer).

  When jet spray is sprayed on the object to be cut on a glass laminate that is not perforated, the jet spray bounces around and scatters. The jet spray bounced back in the plane direction enters between the glass sheets of the glass laminate, and tries to push and spread the layers. At this time, the elasticity and strength of the plate glass and the bonding strength of the bonding function as the resistance force. However, when the plate glass is thinned to a thickness of less than 1.0 mm as in the object of the present invention, the plate glass is remarkably easily deformed and easily broken with respect to an external force, so jet injection is performed in the cross-sectional direction of the glass laminate. Becomes easier to enter. The bonding strength of the bonding is a resistance, but the bonding between the plate glass and the resin does not have a bonding strength that is resistant to a high-pressure jet. As a result, the jet spray that has lost its destination enters the cross-sectional direction of the glass laminate, and causes a large breakage centering on the spray point. For these reasons, it is preferable to start cutting from the out-of-plane direction of the glass laminate in a cutting process using an abrasive water jet of a glass laminate containing thin glass.

  However, when a hole is previously opened in the surface of the glass laminate by a mechanical drilling method or the like, cutting on the inner surface can be started. In this case, if a hole having a diameter that allows jet injection to pass through is opened, and jet cutting is started and cutting is advanced, the jet injection goes down from the cutting start time, so jet injection in the direction of the cross-section of the stack No rebound and easy to achieve crack-free cutting.

  In the glass laminated body containing a thin glass single plate and a thin glass, there is some difference in the difficulty of a cutting process between both. Thin glass single plates generally have low impact strength and are susceptible to breakage due to the impact force of jet injection. However, since the permissible deformation amount is large, it is easy to fix it tightly with the ruggedness absorbing material of an elastic material, and this point is advantageous for cutting without generating cracks. On the other hand, a glass laminate including thin glass has high impact resistance against jet injection, but has a small deformation tolerance and is difficult to be tightly fixed with an uneven absorbent material. Further, as described above, an abrasive water jet jet flows between the glass layers, and breakage from the layers can occur.

  For the measurement of the grain size of the abrasive grains, a laser diffractometer can be used in addition to classification with a sieve. However, when using a laser diffractometer, care must be taken in dealing with the results of particle size measurement with a sieve, such as the adjustment of the refractive index and the conditions of cohesive fracture.

  In observing the breakage of the plate glass, it can be visually confirmed using illumination. However, if a magnifier is used appropriately, it is useful because it becomes easier to find fine cracks.

  Next, the present invention will be specifically described based on comparative examples and examples, but the present invention is not limited to the following examples.

  As an embodiment of the present invention, FIG. 1 schematically shows an abrasive water jet machining apparatus 10. Abrasive grains G of garnet powder whose grain size is adjusted are charged into the abrasive supply silo 11.

  In the implementation test of the present invention, the injection nozzle diameter (not shown) from the high-pressure water supply device 12 is 0.35 mmφ. The supply pressure of the high-pressure water W is 300 MPa, and the supply flow rate of the high-pressure water W is about 5 liters / minute. The nozzle diameter of the jet nozzle 13 of the jet jet flow J of the mixed high-pressure water in which the abrasive grains G were drawn was 1.0 mmφ, and the supply amount of the abrasive grains G was approximately 200 g / min. The distance between the spray nozzle 13 and the cut sample P was 2 mm, and the cutting speed was 100 to 1000 mm / min.

  As the abrasive grain G, a pulverized product with a wide particle size distribution obtained by pulverizing a garnet material with a ball mill was classified with a sieve to adjust the particle size.

  The workpiece fixing base T basically has a metal grid as a base and a plywood having a thickness of 10 mm laid thereon. The uneven | corrugated absorption sheet | seat S made from a foaming polyethylene was mounted on the plywood as an uneven | corrugated absorber, and the cut sample P was mounted on it.

  As the cut sample, a plate glass made of non-alkali glass (OA-10) manufactured by Nippon Electric Glass Co., Ltd. was used. The glass laminate was produced by sandwiching a sheet of PVB resin between plate glasses and applying pressure and heating with an autoclave. Further, three types of thickness of 700 μm, 500 μm, and 100 μm were used for the plate glass. Two types of thicknesses of 760 μm and 380 μm were used for the PVB resin sheet.

  The evaluation of the cutting process was observed visually.

  Table 1 summarizes the minimum thickness of the plate glass, the grain size of the abrasive grains, and the evaluation results.

  In Example 1, a laminate of six thin glass sheets having a thickness of 700 μm was used as a cut sample. The size of the thin glass is 2.1 m × 1.2 m. Five layers of 760 μm thick PVB resin are interposed in the intermediate layer. Therefore, the total number of layers in the material is 11 layers including 6 sheet glass layers and 5 PVB resin layers. The total thickness is 8.0 mm. In this example, the value of (maximum coarse grain / sheet glass thickness) which is the relative grain size of the abrasive grains is 0.36, which satisfies the range of 0.50 or less of the present invention. The value of (average particle diameter / plate glass thickness) is 0.16, which satisfies 0.30 or less of the present invention. The content of fine powder having a particle size of 7 μm or less, which is 0.01 times the thickness of the thin glass layer, is 0.01% of 50% by mass or less based on the total mass of the abrasive grains. Met. As a result of cutting under these conditions, no cracks were confirmed in all the plate glass layers, and good cutting could be achieved.

  In Example 2 and Example 3, as in Example 1, a laminate of 6 sheets of 700 μm thick thin glass was used as a cut sample. Five layers of 760 μm thick PVB resin are interposed in the intermediate layer. The value of (maximum coarse grain / sheet glass thickness) is 0.15 in Example 2 and 0.11 in Example 3, and both satisfy the range of 0.50 or less of the present invention. Moreover, the value of (average particle diameter / plate glass thickness) is 0.07 in Example 2 and 0.04 in Example 3, and both satisfy 0.30 or less of the present invention. The content of fine powder having a particle size of 7 μm or less in terms of the particle size ratio was 0.1% with respect to the total mass of the abrasive grains. As a result of cutting under these conditions, no cracks were confirmed in all the plate glass layers, and good cutting could be achieved.

  In Example 4, a laminate of six thin glass sheets having a thickness of 500 μm was used as a cut sample. The size of the plate glass is 2.1 m × 1.2 m. Five layers of 760 μm thick PVB resin are interposed in the intermediate layer. The value of (maximum coarse grain / sheet glass thickness) of the abrasive grains is 0.08, which satisfies the conditions of the present invention. Moreover, the value of (average particle diameter / plate glass thickness) is 0.04, which satisfies 0.30 or less of the present invention. Further, the content of fine powder having a particle size of 5 μm or less in terms of the particle size ratio was 3% with respect to the total mass of the abrasive grains. As a result of cutting under these conditions, no cracks were confirmed in all the plate glass layers, and good cutting could be achieved.

  In Example 5, four thin glass sheets having a thickness of 100 μm were laminated as a cut sample. The size of the plate glass is 0.3 m × 0.3 m. Three layers of PVB resin having a thickness of 380 μm are interposed in the intermediate layer. The value of (maximum coarse grain / sheet glass thickness) of the abrasive grains is 0.03, which satisfies the conditions of the present invention. The value of (average particle diameter / plate glass thickness) is 0.10, which satisfies the conditions of the present invention. The content of fine powder having a particle size of 1 μm or less in terms of the particle size ratio was 20% with respect to the total mass of the abrasive grains. As a result of cutting under these conditions, no cracks were confirmed in all the plate glass layers, and good cutting could be achieved.

  In Examples 6 and 7, a single plate of thin glass having a thickness of 700 μm was used as a cut sample. The size of the plate glass is 0.8 m × 0.8 m. The conditions of the abrasive grains are the same as those in Example 3 and Example 4, respectively. As a result of cutting under these conditions, no crack was observed in the thin glass, and good cutting could be achieved.

  As a comparative example with respect to the above-described example, in Comparative Example 1, as in Examples 1 to 3, a laminate of six thin glass sheets having a thickness of 700 μm was used as a cut sample. Five layers of 760 μm thick PVB resin are interposed in the intermediate layer. In Comparative Example 1, the abrasive grains have a maximum particle size of 600 μm. The value of (maximum coarse grain / plate glass thickness) which is the relative grain size of the abrasive grains is 0.86. This value is outside the range of 0.50 or less of the present invention. Moreover, the value of (average particle diameter / plate glass thickness) is 0.44, and this value is also outside the range of 0.30 or less of the present invention. As a result of cutting under these conditions, cracks occurred in the glass sheet layer at a frequency of approximately several centimeters per cutting length.

  The present invention showed a method for cutting a thin glass of a brittle material and a processing method for cutting a thin glass constituting a laminated glass. However, the present invention is also applicable to difficult-to-process composite materials using inorganic fibers such as carbon and glass. Is possible.

DESCRIPTION OF SYMBOLS 10 Abrasive type water jet processing apparatus 11 Abrasive grain supply silo 12 High pressure water supply apparatus 13 Mixed high pressure water injection nozzle G Abrasive grain J Jet injection flow P Cutting sample S Concavity and convexity absorption sheet T Work fixing base W High pressure water

Claims (4)

A thin glass sheet having a thickness of less than 1.0 mm or a glass laminate including the thin glass sheet is subjected to processing including cutting of the thin glass sheet by high-pressure injection of a suspension mixed with abrasive grains by an abrasive water jet processing apparatus. A processing method,
A method of processing a glass sheet comprising thin glass or thin glass, characterized by using abrasive grains having a maximum particle size adjusted to a ratio of 0.50 or less with respect to the thickness of the thinnest thin glass.   The processing of a glass laminate including thin glass or thin glass according to claim 1, wherein abrasive grains having an average particle diameter adjusted to a ratio of 0.30 or less with respect to the thickness of the thinnest glass sheet are used. Method.   The processing method of the glass laminated body containing the thin glass or thin glass of Claim 1 or Claim 2 with which an abrasive grain is mainly comprised with the garnet.   The thickness of all plate glass is less than 1.0 mm, The processing method of the sheet glass or sheet glass laminated body in any one of Claims 1-3 characterized by the above-mentioned.