Laminated glass processing defact and sollutions 1 – exhibition – shenzhen zeelang glass co.,ltd electricity problem in up

As an important part of architectural glass, laminated glass is widely used in the construction industry, transportation industry, aviation industry, chemical industry, tanks and other military weapons and equipment. However, in the production process, there are such defects in laminated glass that affect the use of laminated glass. Here we start with the production process of laminated glass, analyze the appearance of its quality defects and performance quality defects. Combining the glass manufacturer’s many years of production experience, summed up a new method to improve the quality of laminated glass. In order to increase the production capacity in the future production, reduce the production of non-conforming products, to produce high-quality laminated glass for customers and improve customer satisfaction.

Laminated glass is a composite glass product made of two or more pieces of glass and a layer of organic material sandwiched and sandwiched between two layers of glass and heated and pressed. The commonly used organic material adhesive layer is polyvinyl butyral vinegar film (PVB film), PVB film has a special excellent performance, the optical index of the film is very good, the light transmittance reaches more than 90%, heat resistance, Cold resistance, impact resistance, elasticity, moisture resistance and anti-aging properties are all very good. Its refractive index is almost the same as glass. The diaphragm does not harden at temperatures above -50°C and has good adhesion properties at 130 to 140°C. At this temperature, the glass is pressed together with a high pressure and the glass is firmly bonded to the glue layer. Laminated glass has a high-strength, elastic and penetrating interlayer, which can withstand large impact forces. Even if the glass breaks, the chips still stick to the film, thus providing high safety performance.

The glass to be sandwiched is placed in a washing machine, cleaned by a washing machine, dried, and sent to a splicing room where the temperature and humidity are controlled, and the appearance of the glass is usually checked here. Next, put the cut film on the glass surface. The film needs to be laid flat to ensure that there is no wrinkle. The second piece of cleaned glass is then placed on the film—that is, a piece of laminated glass is already in place. The splicing process needs to be performed in a very clean environment. The operator needs to wear a headgear, a glove, and trim the excess film on the edge from the edge of the laminated glass. The glass is then positioned and conveyed to a rolling section which slowly heats the glass and uses the outer rubber-coated roller shaft to press the air between the glass and the film and seal the edges of the glass. Finally, the laminated glass is put into the autoclave. The autoclave is the last process of the laminated glass. He can make the residual air into the film and realize the uniform fluidity of the film. The autoclave process strengthens the adhesion between the film and the glass. Produce a seamless glass – laminated glass.

In the actual production process, the quality defects of laminated glass are generally divided into two types, appearance defects and performance quality defects. Here we discuss the causes and solutions of each problem based on different defects:

As the original film of laminated glass must meet the requirements of its use, optical deformation, bubble inclusions, stones, ripples, nodules, etc. are the original film, so in the production process, the glass should be strictly tested, reject the unqualified Original film.

Scratches and water marks generally occur in glass pretreatment. During the cutting stage, whether the cutting platform or unloading platform is clean or not largely determines the number and size of scratches. The reason for the edging stage is that the glass swarf is not treated, the belt pressure of the edging machine is set too large, and the edge of the glass is bruised; the water mark is generated mainly because the location of the air knife is not correct during the grinding and cleaning process. The air pressure was not high enough to cause the water attached to the glass surface not to dry. The solution is to adjust the height of the air knife according to different thickness of glass, adjust the cleaning speed according to the actual situation, and adjust the angle of the glass when cleaning.

In the initial stage of the autoclave, when the autoclave pressure returned to normal, the glass and film temperatures remained high (especially in the upper half of the glass edge). Therefore, the gas will be discharged from the edge of the film. The main reason for this problem is when the autoclave decompresses completely, not when the autoclave door is opened.

Extend the cooling time of the autoclave until the temperature of the glass and film is completely reduced to about 40°C, then decompress the autoclave completely, immediately open the hatch and measure the temperature of the glass. Compare this temperature with the temperature display value of the autoclave. If the deviation is large, the temperature sensing device needs to be corrected. The sensor can be placed in ice water at 0°C or placed in boiling water at 100°C.