CN113799473B - Method for laminating ultra-large laminated glass in autoclave - Google Patents
Method for laminating ultra-large laminated glass in autoclave Download PDFInfo
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- CN113799473B CN113799473B CN202111185181.6A CN202111185181A CN113799473B CN 113799473 B CN113799473 B CN 113799473B CN 202111185181 A CN202111185181 A CN 202111185181A CN 113799473 B CN113799473 B CN 113799473B
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- autoclave
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
- C03C27/06—Joining glass to glass by processes other than fusing
- C03C27/10—Joining glass to glass by processes other than fusing with the aid of adhesive specially adapted for that purpose
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Joining Of Glass To Other Materials (AREA)
Abstract
The invention relates to an ultra-large laminated glass autoclave laminating method, and belongs to the field of glass deep processing. According to the invention, wind is changed from the length direction trend of the original horizontal autoclave to the semicircular annular trend, the circulating distance of the air duct is shortened, the circulating frequency is increased, the uniform cooling degree of the whole glass is greatly improved, meanwhile, the applicant is combined with years of practical experience, the key 90-degree cooling is reduced to 80-degree cooling at the average speed of 0.2 per minute, the qualification of various indexes of the large glass is ensured, rainbow spots are not generated any more, and the appearance and performance indexes are perfect.
Description
Technical Field
The invention relates to the field of glass deep processing, in particular to an ultra-large laminated glass autoclave laminating method.
Background
The glass products are not only limited to indoor lighting, but also become part of beautifying life. Glass curtain walls, glass bearing columns and the like are required to bear certain pressure, and the thickness of single glass is limited, so that laminated glass is generated. The laminated glass is a composite glass product which is formed by permanently bonding two or more pieces of glass with one or more layers of organic polymer intermediate films interposed therebetween and subjected to special high-temperature pre-pressing (or vacuumizing) and high-temperature high-pressure process treatment. As a typical interlayer film for laminated glass, PVB, SGP, EVA, PU and the like are mentioned. The laminated glass is called safety glass, and after being broken by impact, the PVB film sandwiched between two pieces of common glass can not generate sharp fragments to hurt people like the common glass. Meanwhile, the PVB intermediate film has the properties of sound insulation and sunlight control, and becomes a novel building material with energy-saving and environment-friendly functions, and the laminated glass can isolate the 1000-2000 Hz anastomosis noise which can penetrate through common glass, and can block more than 99% of ultraviolet rays and absorb heat in an infrared spectrum. As a laminated glass conforming to the properties of the novel building material, the laminated glass must play a great role in the use of safety glass.
In an autoclave, under the condition of high temperature, an intermediate film is softened, two pieces of glass are firmly bonded together under high pressure, and the temperature is reduced after heat preservation for a period of time, and the process is called a laminating process in the field. Adhesive-clamping method for oversized adhesive-clamped glass "
(ZL 2011103386503) the disclosed laminating method: laminating two pieces of glass and a film to form a film, finishing laminating the film in an autoclave through normal-temperature cold pumping and hot pumping, wherein the cold pumping is vacuum pumping at normal temperature, the hot pumping comprises two continuous stages of heating normal-pressure hot pumping and heating pressurizing hot pumping, the heating pressurizing comprises the steps of heating, boosting, preserving heat, maintaining pressure and rapidly reducing temperature, the film is softened by heating, the gas between the glass is discharged by pressurizing, and the adhesion of the two pieces of glass is improved. The traditional autoclave is a horizontal autoclave, an air duct 4 is arranged in the autoclave near the wall of the autoclave, a heater 2 and a cooler 3 are arranged on the left side and the right side of the air duct, a fan 5 is arranged at the front end of the autoclave, the flow direction of the air is from the front end to the tail end to reach the autoclave door 1, then the autoclave is folded at 180 degrees, passes through the laminated glass 11 in the inner cavity, and finally is sucked into the impeller of the fan 5 to form circulation. The purpose of this circulation is to make the temperature in the autoclave cavity uniform, see figures 1 and 2; however, the mode is only suitable for short glass, if the glass is lengthened by more than 15 meters, wind power is blocked midway, the wind speed is reduced, and the temperature difference between the front end and the rear end of the inner cavity of the kettle is larger; meanwhile, in the laminating process, after the film is heated to about 130 ℃, the film needs to be rapidly cooled, and the cooling curve is shown in fig. 7, but because the oversized glass plate surface is large, the whole glass temperature is difficult to be consistent in the cooling process, so that rainbow spots with different degrees can appear on the glass surface due to the inconsistent glass plate surface temperature in the glass cooling process, and the appearance and the glass performance are seriously influenced.
Disclosure of Invention
Aiming at the defects in the field, the invention provides an ultra-large laminated glass autoclave laminating process, which changes an air duct, changes the air direction, shortens the distance of the air duct, increases the circulation frequency, ensures that the temperature of the front end and the rear end of an inner cavity of the autoclave is uniform, greatly improves the uniform cooling degree of the whole glass, and further adjusts the cooling curve so that rainbow spots do not appear on the surface of the laminated glass.
A laminating method of an oversized laminated glass autoclave comprises the steps of laminating two pieces of glass and a rubber sheet, pushing the laminated glass into the middle of a horizontal autoclave, carrying out heat pumping for 2 hours by heating to 110 ℃, then simultaneously heating and boosting to 135 ℃ and 1.25 megapascals respectively, then carrying out heat preservation and pressure maintaining for 2-3 hours, then quickly cooling to 90 ℃, slowly cooling to 90-80 ℃, then carrying out heat preservation for 1 hour, quickly cooling to 80-30 ℃, and beginning to reduce the pressure to normal pressure after 40 ℃, thereby finishing laminating, and the method is characterized in that: the rapid cooling is carried out at a cooling speed of 2-3 ℃ per minute; the slow cooling is carried out at a cooling speed of 0.2 ℃ per minute;
wherein the laminated glass is horizontally fed into the autoclave, the wind direction of the laminated glass is blown out from the top of the horizontal autoclave, and the laminated glass enters the inner cavity of the autoclave from the middle part of the autoclave after being heated by a heater or cooled by a cooler at one upper side of the autoclave, enters the other upper side of the autoclave from the middle part of the autoclave, and circulates to the fan blades at the top; or alternatively
Wherein the laminated glass is vertical type kettle inlet, the wind direction of the laminated glass is blown out from the top of the horizontal type autoclave, and the laminated glass enters the inner cavity of the autoclave from the middle part of the autoclave after being heated by heaters or cooled by coolers on two upper sides of the autoclave respectively, and then rises from the middle part of the autoclave and circulates to the fan blades on the top.
An air guide plate is arranged at the position, close to the kettle wall, from the top to the lower part in the autoclave, so that an air channel is formed between the autoclave wall and the air guide plate, and a rotatable baffle plate is arranged at the middle part of the air guide plate.
Wherein the fan is fixed in the spiral case, and the air outlet of spiral case guide fan, the air intake of fan are provided with removable guide duct.
The middle part of the inner cavity of the high-pressure kettle is provided with a detachable horizontal baffle, and the laminated glass of the horizontal kettle is positioned below the horizontal baffle.
The top of the air duct is fixedly provided with a plurality of fans, and a plurality of heaters and coolers are respectively fixed in the air duct on one upper side and the air duct on the other upper side of the autoclave.
The number of the fans is the same as that of the heaters and the coolers.
The improvement method of the invention comprises the following steps: the original long-distance direction of the air channel from the front end to the rear end is changed into the annular direction of the air channel, namely, the direction of the air in the length direction of the original horizontal autoclave is changed into the semicircular direction of the air channel, the circulating distance of the air channel is shortened, the circulating frequency is increased, and the uniform cooling degree of the whole glass is greatly improved. Meanwhile, the applicant combines practical experience for many years, the conventional requirement of reducing the temperature by 2-3 ℃ per minute is also a manufacturer guiding parameter, but for oversized glass, the area of which is more than 70 square meters is uniform and difficult to cool, and finally, the key 90-80-DEG is found out, and only the 10-DEG temperature difference needs to be reduced by 3 hours, because the temperature of the temperature section film is gradually hardened and solidified from liquid paste, the key period of ionic bond bonding conversion in the film is required to ensure that the temperature difference of each place at each moment can not exceed 0.5 DEG, so that the temperature is reduced at the average speed of 0.2 per minute, and all indexes of the oversized glass are ensured to be qualified.
When the laminated glass is horizontally fed into the autoclave, the laminated glass is horizontally pushed into the autoclave, the air duct only runs the upper half part, namely a semicircle ring shape, the air direction of the air duct is blown out from the top of the horizontal autoclave, the air is heated by a heater or cooled by a cooler at the upper side of the autoclave, then enters the inner cavity of the autoclave from the middle part of the autoclave, then is blown through the upper surface and the lower surface of the laminated glass, then enters the other upper side from the middle part of the autoclave, and circulates to the fan blades at the top;
when the laminated glass is vertically fed into the autoclave, the laminated glass is vertically pushed into the autoclave, the air channels of the laminated glass run in two semicircular rings, the air directions of the laminated glass are blown out from the top of the horizontal autoclave, the laminated glass enters the inner cavity of the autoclave from the lower part of the autoclave after being heated by the heaters or cooled by the coolers on the two upper sides of the autoclave respectively, and the laminated glass is blown through the two surfaces of the laminated glass respectively along the lower part of the autoclave, then rises from the middle part of the autoclave and circulates to the fan blades on the top.
For the transformation of setting, the high-power fan that is located the front end has been changed into a plurality of little fans that are located the top, and the deep bead middle part has set up a rotatable fly leaf moreover. When the movable plate rotates and is fixed with the inner wall of the kettle, the air duct only runs on the upper half part, the air outlet of the fan is adjusted to face one side, and the laminated glass can horizontally enter the kettle; when the movable plate and the wind shield are connected into a whole, the upper air duct and the lower air duct are communicated, the air outlet of the fan is adjusted to face to two sides, and the laminated glass can vertically enter the kettle.
According to the invention, wind is changed from the length direction trend of the original horizontal autoclave to the semicircular annular trend, the circulating distance of the air duct is shortened, the circulating frequency is increased, the uniform cooling degree of the whole glass is greatly improved, meanwhile, the applicant is combined with years of practical experience, the key 90-degree cooling is reduced to 80-degree cooling at the average speed of 0.2 per minute, the qualification of various indexes of the large glass is ensured, rainbow spots are not generated any more, and the appearance and performance indexes are perfect.
Drawings
Figure 1 is a front cross-sectional view of an autoclave of the prior art,
figure 2 is a left cross-sectional view of an autoclave of the prior art (horizontal in-tank),
figure 3 is a front cross-sectional view of an autoclave of the present invention,
FIG. 4 is a left cross-sectional view of an autoclave of the present invention (horizontal in-tank),
FIG. 5 is a left cross-sectional view of an autoclave of the present invention (vertical feed autoclave),
figure 6 is a top view of an autoclave of the present invention,
figure 7 is a prior art cooling control curve,
figure 8 is a graph of the cooling control of the present invention,
the reference numerals in the figures are listed below: 1-kettle door, 2-heater, 3-cooler, 4-wind channel, 5-fan, 6-spiral case, 7-guide duct, 8-rotatable baffle, 9-horizontal baffle, 10-aviation baffle, 11-double-layered glass. The direction of the arrow in the figure is the direction of the wind.
Detailed Description
The invention relates to an improvement of a laminating method of an oversized laminated glass autoclave, which comprises improvements in two aspects of technology and equipment.
Structural glass dimensions: 3600*24000
Autoclave size: 4500*26000
1. The process is improved:
(1) Wind direction improvement:
A. the arrow direction shown in fig. 4, wherein the laminated glass is fed into the autoclave horizontally, the wind direction of the laminated glass is blown out from the top of the horizontal autoclave, the laminated glass enters the inner cavity of the autoclave from the middle part of the autoclave after being heated by a heater or cooled by a cooler on one upper side of the autoclave, then enters the other upper side of the autoclave from the middle part of the autoclave, and circulates to the fan blades on the top; or alternatively
B. The arrow direction shown in fig. 5, wherein the laminated glass is vertical type, the wind direction of the laminated glass is blown out from the top of the horizontal autoclave, and the laminated glass enters the inner cavity of the autoclave from the middle part of the autoclave after being heated by the heaters or cooled by the coolers on the two upper sides of the autoclave, then rises from the middle part of the autoclave and circulates to the fan blades on the top.
(2) Improvement of cooling curve: the cooling step comprises rapid cooling and slow cooling, wherein the rapid cooling is carried out at a cooling speed of 2-3 ℃ per minute; the slow cooling refers to the stage of cooling from 90 ℃ to 80 ℃ at a cooling speed of 0.2 ℃ per minute, and then preserving heat for 60 minutes, as shown in figure 8.
2. Improvement of equipment:
as shown in fig. 3-6, an air deflector 10 is arranged in the horizontal autoclave from top to bottom and adjacent to the autoclave wall, so that an air duct 4 is formed between the autoclave wall and the air deflector 10, wherein a rotatable baffle 8 is arranged in the middle of the air deflector.
9 fans 5 are fixed at the top of the air duct 4, and 9 heaters 2 and coolers 3 are fixed in the air duct on one upper side and the air duct on the other upper side of the air duct 4. The fan 5 is fixed in the spiral case 6, and the spiral case 6 can guide the air outlet of fan 5, and the air intake of fan 5 still is provided with removable guide duct 7.
A detachable horizontal baffle 9 is arranged in the middle part of the autoclave.
When the laminated glass 11 is in a horizontal type kettle, the glass is horizontally positioned in the middle of the kettle and below the horizontal baffle 9, and the rotatable baffle is rotated to be fixed with the kettle wall, so that the air guide pipe 7 is connected with the air inlet of the fan. The wind direction can only be horizontally swept to the upper and lower surfaces of the glass, so that the semicircular wind direction can only flow out from one side to the middle of the kettle and then enter the autoclave, the wind horizontally sweeps the upper and lower surfaces of the glass, and due to the action of the horizontal baffle plate, the wind does not enter the upper part in the kettle and can only enter the air channel at the other side, and reaches the air inlet of the fan through the air guide pipe to form circulation.
When the laminated glass 11 is vertical into the kettle, the horizontal baffle is removed, the glass is vertically positioned in the middle of the kettle, and the rotatable baffle is rotated, so that the air guide plates are connected into a whole, and the air guide pipe of the air inlet of the fan is removed. The wind direction is horizontally swept to the upper surface and the lower surface of the glass, so that the semicircular wind direction flows through the lower part of the autoclave from two sides at the same time and then enters the autoclave, horizontally sweeps the upper surface and the lower surface of the glass, rises to the upper part of the inner cavity of the autoclave and reaches the air inlet of the fan to form circulation.
The fan can be arranged at the bottom of the autoclave, the whole wind direction is reversed, the improvement of the device is reversed, and the aim of the invention can be achieved, but for convenient operation, the fan is arranged at the top of the autoclave as a preferable scheme.
The technological operation procedure of the laminating is as follows:
according to the sandwich process, the first stage is carried out by wrapping the glass with a vacuum bag, pumping with a vacuum nozzle, continuously pumping for 60-180 minutes under the negative pressure of 0.08-0.1 megapascals, pumping all the internal air (including the air between the glass and the rubber sheet) to tightly press the glass and the rubber sheet together, then hanging the glass on an autoclave rail car, pushing the autoclave, and closing the door of the autoclave. The second stage is performed to raise the temperature to 80 degrees for 40 minutes and to keep the temperature for about 20 minutes. The third stage is carried out, the temperature is increased to 135 ℃ for 40 minutes, the temperature is kept for 180 minutes, the internal clamping piece is completely liquid, then the temperature is quickly reduced to about 20 minutes to reach 90 ℃ in a fourth stage, the rubber piece is changed into paste from the liquid state, then the temperature is slowly reduced from 90 ℃ to 80 ℃ and is controlled to be 0.2 ℃ per minute, the temperature difference between the inside and outside of the laminated glass is controlled to be minimum, the temperature is kept at 80 ℃ for 60 minutes, finally the fifth stage is carried out, the temperature is quickly reduced to room temperature, the whole kettle opening process is completed, the pressure in the autoclave is started from the beginning of the temperature increase, the pressure reaches 1.25 megapascals when the temperature reaches 80 ℃ until the temperature is reduced to 40 ℃, the pressure is released (i.e. is released), the pressure in the autoclave is completely not reduced, the kettle door is opened, the glass frame is pulled out, and the glass laminating process is completed.
Claims (2)
1. A laminating method of an oversized laminated glass autoclave comprises the steps of laminating two pieces of glass and a rubber sheet, pushing the laminated glass into the middle of a horizontal autoclave, carrying out heat pumping for 2 hours by heating to 110 ℃, then simultaneously heating and boosting to 135 ℃ and 1.25 megapascals respectively, then carrying out heat preservation and pressure maintaining for 2-3 hours, then quickly cooling to 90 ℃, slowly cooling to 90-80 ℃, then carrying out heat preservation for 1 hour, quickly cooling to 80-30 ℃, and beginning to reduce the pressure to normal pressure after 40 ℃, thereby finishing laminating, and the method is characterized in that: the rapid cooling is carried out at a cooling speed of 2-3 ℃ per minute; the slow cooling is carried out at a cooling speed of 0.2 ℃ per minute;
wherein the laminated glass is horizontally fed into the autoclave, the wind direction of the laminated glass is blown out from the top of the horizontal autoclave, and the laminated glass enters the inner cavity of the autoclave from the middle part of the autoclave after being heated by a heater or cooled by a cooler at one upper side of the autoclave, enters the other upper side of the autoclave from the middle part of the autoclave, and circulates to the fan blades at the top; or alternatively
The laminated glass is vertically fed into the autoclave, the wind direction of the laminated glass is blown out from the top of the horizontal autoclave, and the laminated glass enters the inner cavity of the autoclave from the lower part of the autoclave after being heated by heaters or cooled by coolers on the two upper sides of the autoclave respectively, then rises from the middle part of the autoclave and circulates to fan blades on the top;
an air deflector is arranged at the position, close to the kettle wall, from the top to the lower part in the autoclave so as to form an air channel between the autoclave wall and the air deflector, wherein a rotatable baffle is arranged at the middle part of the air deflector;
the middle part of the inner cavity of the high-pressure kettle is provided with a detachable horizontal baffle, and the laminated glass of the horizontal kettle is positioned below the horizontal baffle;
the top of wind channel is fixed with a plurality of fan, all is fixed with a plurality of heater and cooler in the wind channel of autoclave upside and another upside, and wherein the fan is fixed in the spiral case, and the air outlet of spiral case guide fan, the air intake of fan are provided with removable guide duct.
2. The laminating method according to claim 1, wherein the number of fans is the same as the number of heaters and coolers.
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| JP2006088049A (en) * | 2004-09-24 | 2006-04-06 | Ashida Seisakusho:Kk | Method and apparatus for circulating hot wind in autoclave |
| CN201241019Y (en) * | 2008-06-20 | 2009-05-20 | 辽宁北方玻璃机械有限公司 | Air pressure kettle for machining laminated glass |
| JP2019069864A (en) * | 2017-10-05 | 2019-05-09 | 日本電気硝子株式会社 | Laminated glass production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201720040U (en) * | 2010-07-19 | 2011-01-26 | 浙江鼎玻自动化设备有限公司 | Inner force convection high pressure autoclave |
| CN102503189B (en) * | 2011-10-31 | 2014-03-26 | 北京北玻安全玻璃有限公司 | Film clamping method of oversized laminated glass |
| NL2015138B1 (en) * | 2015-07-10 | 2017-02-01 | Fits Holding Bv | Method of manufacturing a sandwich panel. |
| CN105346168B (en) * | 2015-12-01 | 2018-05-01 | 中国建筑材料科学研究总院 | A kind of bulletproof glass and preparation method thereof |
| CN105922715B (en) * | 2016-04-26 | 2018-01-05 | 天津北玻玻璃工业技术有限公司 | The erect-type of doubling glass piles up method in autoclave |
| CN107324659A (en) * | 2017-07-17 | 2017-11-07 | 上海永丽节能材料有限公司 | A kind of foam glass abrasive product and preparation method thereof |
| US20210293077A1 (en) * | 2018-05-24 | 2021-09-23 | Vkr Holding A/S | VIG Unit Lamination |
| CN110576659A (en) * | 2019-09-16 | 2019-12-17 | 宿州市天艺钢化玻璃有限公司 | production process of plank road glass |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006088049A (en) * | 2004-09-24 | 2006-04-06 | Ashida Seisakusho:Kk | Method and apparatus for circulating hot wind in autoclave |
| CN201241019Y (en) * | 2008-06-20 | 2009-05-20 | 辽宁北方玻璃机械有限公司 | Air pressure kettle for machining laminated glass |
| JP2019069864A (en) * | 2017-10-05 | 2019-05-09 | 日本電気硝子株式会社 | Laminated glass production method |
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