Mold design: Design a continuous wavy arc-shaped movable and detachable mold, with the convex part as the fixed part, the concave parts on both sides as the moving part, and the middle of the concave part's arc position as the dividing point, divided into three mold parts.
Glass heating: A movable and detachable mold is set at a certain distance interval, and then three pieces of glass are stacked in sequence on the top of the mold. The ultra white glass A2 is set in the middle, and the flat ultra white glass A1 and A3 are set in the upper and lower parts. The heating furnace is started to heat the three pieces of glass. During heating, the metal oxide film layer on the surface of the ultra white glass A2 can exchange some metal ions with the glass surface in contact. The metal oxide film layer is heated, which does not damage the original smooth and transparent properties of the glass, but instead forms a layer of metal diffusion surface, increasing the strength of the glass contact surface by about 1 times. It is safe and impact resistant.
Mold spacing: The movable and detachable mold is set at a certain distance interval, and the moving parts on both sides are equidistant from the fixed parts. After the interval is set, the three mold components are arranged horizontally, and the total length of the three components is the same as that of the ultra white glass A1, ultra white glass A2 or ultra white glass A3. The upper part of the three mold components is arranged in a wavy arc shape.
Film processing: Select several thicknesses of PVB film, first perform cold vacuum treatment to completely exhaust the gas inside the multi-layer film, and then heat to bond the multi-layer film together.
Vacuum bag vacuum pumping: After cold pumping, a thick PVB film is placed between the curved glass B1 and the third curved glass B3, and between the curved glass B1 and the third curved glass B3 that have a metal diffusion layer after processing. The stacked glass is then placed in a vacuum bag for overall vacuum pumping. The metal diffusion layer not only increases the strength of the glass contact surface, but also improves the adsorption effect with PVB during vacuum pumping, effectively and completely expelling gas.
Autoclave steaming: The overall composite glass enters the autoclave and is steamed out at high temperature and high pressure, forming a wavy curved laminated glass.
Avoid bubbles and residual air: The presence of bubbles in the middle of the adhesive and the fit of the gap between the two glasses directly affect the quality of the laminated glass. Therefore, special attention should be paid to eliminating bubbles and residual air during the processing.
Deformation control: Curved laminated glass may undergo significant deformation during processing, which can affect the quality and safety of the product. Therefore, corresponding measures need to be taken in the design and processing process to control deformation.
In summary, when processing curved laminated glass, attention should be paid to mold design, glass heating, mold spacing, film processing, vacuum bag vacuuming, high-pressure vessel steaming, avoiding bubbles and residual air, and deformation control. Proper handling of these issues is crucial for ensuring product quality and safety.