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Laminated glass production defects how to do? I an antidote against the disease!

[ Time:2016-10-28 Click:4466 ]


Laminated glass is made of two or more than two pieces of glass, which is sandwiched between two layers of glass by heating and pressing.
Commonly used laminated glass intermediate film are: PVB, SGP, EVA, PU, etc..
In the laminated glass production process appear quality defects how to do?
The "medicine" is very important for the "disease"
First of all, we must understand that the quality of laminated glass is generally divided into two types
Appearance defect performance quality defect
01
Primary defect
As the original film laminated glass must meet the requirements of the use of optical, deformation, bubble inclusions, stones, wave, knot are original film comes, so in the production process, strict inspection of glass to eliminate substandard raw.
02
Scratch, water mark
Scratch, water mark generally occurs in the glass pretreatment, in the cutting stage, cutting platform, unloading platform clean or not to a large extent determine the number and size of the scratch.
The reason is the stage edge grinding glass debris untreated, pressure belt grinding machine set is too large, the edge of the broken glass; causes of water mark is not correct, in the end edge grinding knife position wind stroke cleaning process is attached on the surface of the glass to cause water not dry.
Solution: according to the different thickness of the glass to adjust the different height of the wind, adjust the cleaning speed according to the actual situation, and adjust the angle of the glass cleaning.
03
Bubble
Bubble problem is divided into three kinds: glass edge small bubbles, large bubbles of the edge of the glass, a number of locations have the bubble part of the bubble generation
Cause of side small bubbles
At the initial stage of the autoclave, the temperature of the glass and the film is still very high, especially when the pressure is restored to the normal value. Therefore, the gas will be discharged from the edge of the film, the main reason for this problem is when the autoclave completely decompression, rather than the pressure kettle door when the door is opened.
Resolvent
Extension of autoclave cooling time until the glass and film temperature is reduced to 40 DEG C, and then the autoclave complete decompression, open the door immediately, and measuring the temperature of the glass. Compared with the temperature display value of the autoclave, the temperature sensing device is required to correct the temperature sensing device, which can be used to put the sensor into the ice water 0 degrees Celsius or put in the boiling water 100.

Resolvent
Extension of autoclave cooling time until the glass and film temperature is reduced to 40 DEG C, and then the autoclave complete decompression, open the door immediately, and measuring the temperature of the glass. Compared with the temperature display value of the autoclave, the temperature sensing device is required to correct the temperature sensing device, which can be used to put the sensor into the ice water 0 degrees Celsius or put in the boiling water 100.
Cause of large bubbles in the side
Semi circular bubbles appear on the lower part of the glass
Because of work support in the autoclave material is too soft, resulting in laminated glass is separated by forming bubbles
Resolvent
Work support material using more hard material
A semi circle around the glass
Because the glass preheating after preloading, the edge seal, resulting in high temperature and high pressure autoclave processing, air into the glass film, or open film, the preservation of environmental humidity is too high
Resolvent
By increasing the pre heating temperature to ensure the sealing performance of the edge of the glass
Bubble distribution of multiple locations to consider two reasons
Incorrect pretreatment process technology
If the temperature is too low, the film cannot be fully expanded, the gas will exist between the glass and the film, if the temperature is too high the film edge too early, a lot of bubbles will stay in between the glass and the film can not be excluded
Resolvent
Analyzing the parameters of the pretreatment process and adjusting the equipment correctly can improve the surface temperature of the glass, but the better way is to reduce the working speed of the pretreatment
The improper processing technology of high pressure kettle
Resolvent
The autoclave is heated, the temperature and the pressure must be increased, keep the stage temperature must be at 135-145 DEG C, the pressure is 12bar, the highest temperature can not exceed 160 DEG C, this will lead to the edge of the glass film, yellow, fade, shedding or autoclave combustion
Cause of formation of some bubbles
If in the preprocessing process of rolling in the bubble in the glass is on the back as the pretreatment temperature is too high, the film edge too early, the bubble can not be excluded by
Resolvent
Speed up the delivery to reduce the temperature or turn off the heater
04

Film folds and visual defects
The film is pulled in cutting, cutting the film after retraction, causing some edge without film; key processing process is to ensure uniform heating and full exhaust between glass and PVB, if the rolling roller rough and uneven heating, pre pressure exhaust process may lead to inadequate exhaust film or premature edge, due to residual bubbles the film, uneven thickness and impurities may lead to defects such as vision curve, dark stripes and spots etc..
Resolvent
In the film, the film is mainly flat on the glass, and to ensure that the film does not fold, before entering the autoclave, the laminated glass surface temperature is maintained at 21 C and 27 C, can help prevent wrinkles, and can reduce the visual defect
05
Glass or in the right direction is not correct
In the process of processing, the film can flow or fill a certain gap, and keep the glass bonding. Rolling and autoclave processing may make the sandwich look successful bonding, but with the time of the past, due to the bow, waveform and the mismatch may lead to the side of the edge of the.
Resolvent
Laminated glass needs correct matching to minimize or bow waveforms caused by stacking faults, with the same direction bow and waveform glass for sandwich production, because in some cases, to clamp the edge of laminated glass, that is to ensure the full contact of laminated glass, but in fact he may be the local stress caused by the change of laminated glass and, make the film become thin, causing the degumming.
06
Degumming
The main reason is that the adhesion between the laminated glass and the glass is too low.
Resolvent
Check whether the water quality of washing machine is less than 15US, cleaning agents to check whether or not to use too much or too little, is unclean whether the glass surface (such as cutting oil or cleaning agents), check the cleaning brush wear or position is too high, check film humidity (RH merging room control in 25 ~ 30%), check glass warp or tablets in the right direction (glass special attention)
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Laminated glass production process in the emergence of defects do not worry, the key to accurately identify the problem will have the effect of precision