[China Glass Net] Vacuum bag forming process is a new type of composite material forming process, which has the advantages of simple operation, stable product quality and high production efficiency. It is widely used in aerospace, shipbuilding, high-speed trains, sporting goods, wind blades and other fields. .
Laminated glass, also known as laminated glass, is made up of two or more layers of glass, as the name suggests. It is safe because there is one or more layers of film between the glass. When the glass is broken by impact, the fragments are stuck by the film, and only radial cracks are formed, which will not cause personal injury or death due to debris scattering. It is mainly used in automobiles, ships, airplanes, trains and high-rise buildings. By changing the properties of the film and the combined structure, it can produce laminated glass with various functions, such as bulletproof glass, electrochromic glass, electromagnetic shielding glass, fireproof glass, antenna glass, electric heating glass, anti-theft alarm glass, and transition color laminated glass. UV laminated glass, etc.
The production method of the laminated glass includes two methods of film hot pressing and grouting. At present, most of the film hot pressing method adopts a silicone rubber ring, which is referred to as a silicon ring method. The silicone rubber ring is made of methyl vinyl silicone rubber raw rubber added to the double-roll rubber mixer or the closed kneading machine. After gradually adding carbon black and other additives, the dough is extruded and the profiled rubber strip is extruded by the extruder. , made by bonding and other processing methods. The process of producing laminated glass by the silicon ring method is as follows: firstly, a silicon ring with a slightly smaller product size is fabricated, PVB film is placed between the two layers of glass, the silicon ring is placed on the edge of the glass of the interlayer film, and the silicon ring is vacuumed. The preheat treatment is carried out in an oven, and then heated and pressurized in an autoclave to obtain a laminated glass product. The advantages of the production of laminated glass by the silicon ring method are: easy and fast operation, and the silicon ring can be reused. At the same time, there are disadvantages: the edge of the laminated glass is often bubbled, the quality of the product is not stable enough; the silicon ring is expensive, and different sizes of laminated glass need to be customized with different silicon rings.
Compared with the silicon ring method, the vacuum bag method is used to manufacture the laminated glass, which can significantly reduce the content of bubbles or defects of the product; improve the transparency of the laminated glass; and the product quality is stable and the yield is high. The operating principle of the laminated glass by vacuum bag method is as follows: the flat glass and the film are sealed by a vacuum bag, vacuumed, and then heated, the film is slowly melted, and the gas wrapped between the flat glass passes through the perforated release film to enter the airfelt. Afterwards, it is removed by the vacuum valve, so that the flat glass is tightly bonded together. The vacuum sealing method of laminated glass is shown in Fig. 1. The operation steps of producing laminated glass by vacuum bag method are as follows: (1) placing a flat glass on a horizontal mold; (2) laying a plurality of layers of EVA film on the flat glass; (3) placing another flat glass; (4) The stripping film covers the end surface, fixes the position with pressure-sensitive adhesive tape, and coats the air-proof felt at the corners of the flat glass to prevent the vacuum bag from being punctured; (5) Covering the flat glass with a vacuum bag and vacuuming the bag with a sealing strip (6) Install the vacuum valve, use the quick connector to connect the vacuum tube; (7) vacuum; (8) heat to 160-170 ° C in the oven, keep warm; (9) cool down to room temperature, remove the laminated glass out of the oven; 10) Remove the release film, airfelt, vacuum bag; (11) Place the laminated glass in the autoclave, heat and pressurize, press the laminated glass to the required thickness; the purpose of using the release film in the manufacturing process: 1 Prevent the film from being melted and adhered to the vacuum bag to avoid partial tearing of the film when demolding, improve the appearance of the product, and facilitate demolding; 2 the film can be overflowed after being melted, but the amount of overflow is not excessive, and the edge of the glass is kept. Flat .
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