[China Glass Net] 1. Cutting, cleaning and processing of glass:
When cutting, the original piece should be cut to obtain a good edge peeling effect, the size should be accurate, and no difference of more than 2MM is allowed, so as to avoid bubble generation due to uneven edges. The edge of the glass after cutting is ground and then washed with a processor. After cleaning, there should be no oil and other debris left on the glass surface. The cleaned glass is dried and placed at room temperature before use.
2, the film:
The splicing should be carried out in a splicing room that meets the process requirements:
(1) The cleanliness must be high, and the cleanliness should be purified to 100,000 levels;
(2) The staff should have clothing and tools that are compatible with the conditions of purification;
(3) The room temperature is 25 soil 2 ° C relative humidity is about 25%;
(4) The upper and lower layers of glass interlayer should be aligned, and the stacking difference should not exceed 1.5 mm;
(5) The PVB film and the glass interlayer should be kept clean.
In the splicing chamber that meets the process requirements, after the glass is laid flat, the PVB interlayer film is spread flat on the glass and another glass is placed. Trim and cut the PVB interlayer film with a knife. When trimming, it is not possible to pull the PVB interlayer film to avoid deformation of the PVB interlayer film, and to ensure that the balance of the PVB interlayer film outside the glass is in the range of 2-5 MM. When trimming, the blade must not be in contact with the glass to prevent the generated glass particles from causing bubbles at the edges after processing.
3, pre-pressure exhaust:
The combined glass must be pre-pressed and vented to remove the residual air between the glass and the PVB interlayer film, and a good edge-sealing effect can be obtained before high-pressure molding.
There are two ways to pre-press the exhaust:
A, rolling pressure exhaust method:
Processing Equipment:
Flat pressure initial press: PY-25 type, Changzhou Huaguang Machinery Co., Ltd.;
After the glass is cleaned and dried, the composite film is automatically transferred into the input end of the device, driven by it, smoothly rolled into the pre-pressing roller and uniformly rolled, and the air is initially removed, and the pre-pressure and heating oven are pre-pressed and heated. After the film reaches the required sintering temperature, the glass and the film have good contact, and the input roller is evenly rolled by the transfer roller in the heating box, so that the glass and the film are fused together, and then outputted by the output section, the glass is output. It is firmly bonded to the film and is almost transparent, so that the work of the flat laminated glass is completed once and then prepared for later processing in the autoclave.
The finished glass enters the roller press, and after being pressed by the front roller, it enters the incubator, and then is squeezed by the second roller, and the process is completed by exhausting and sealing. After the second roller is rolled out, a full circle of transparent strips should be placed around the laminated glass to seal the edges to prevent the gas in the autoclave from flowing back to generate bubbles. Other parts may have a uniformly distributed opaque portion. This process requires that the surface temperature of the glass must be strictly controlled, neither the temperature is too high, the sealing edge is too early, the internal gas cannot be discharged; the temperature is too low, the sealing is not complete, and the reflux bubble is generated.
Suggestion: After the preheated glass is preheated, the surface temperature is about 20-25 °C. The gap of the front rubber roller should be about 1 mm smaller than the total thickness of the laminated glass, and the pressure is about 0.2-0.5 MPA. The gap of the second rubber roller should be about 2 mm smaller than the total thickness of the laminated glass, and the pressure is about 0.4-0.6 MPA. When entering the second roller, the surface temperature of the glass must be strictly controlled at around 60-80 °C. At the time of production, the glass products to be processed are first prepared, and the production is carried out as continuously and uninterrupted as possible, so as to avoid the temperature difference of the incubator being too long due to the long interval, and the glass surface temperature cannot be accurately controlled.
Advantages of roll-exhaust method: continuous production, high output and energy saving.
B, vacuum pre-pressure exhaust method:
Processing Equipment:
Curved glass pre-press: ZK-25 type;
Put the piece of glass into a vacuum bag or put a vacuum apron around it, and then use cold pressure, hot pumping, and use the pressure difference to discharge and seal the air in the glass/PVB interlayer film interface.
Suggestion: The vacuum degree of vacuum is above 650MMHG, the cold drawing temperature is about 25°C, and the cold drawing time is more than 20 minutes. When hot pumping, the glass surface temperature needs to reach 70-120°C for more than 40 minutes.
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