To balance the UV and transparency of EVA film laminated glass, you can consider the following steps:
Choose the right type of EVA film: EVA films used for laminated glass come in different variations, including indoor and outdoor types. Indoor EVA films have a lower UV blocking rate and are suitable for use inside buildings. On the other hand, outdoor EVA films have a higher UV blocking rate, typically absorbing 85% or more of UV radiation, making them suitable for outdoor use. Selecting an outdoor EVA film with a higher UV blocking rate can help balance UV protection and transparency. Optimize the lamination process: The lamination process plays a crucial role in achieving the desired balance between UV protection and transparency. Here are some key considerations: Use a laminating oven: Unlike PVB film, which requires an autoclave for lamination, EVA film can be laminated using a simple one-step laminating oven, which is simpler and less costly to install. Ensure that the oven provides even heating to achieve consistent lamination results. Maintain vacuuming until cool: After the laminated glass is cooled to room temperature, it is important to continue the vacuuming process until the glass is completely cool. This helps prevent the formation of bubbles inside the laminated glass. Properly clean and prepare the glass: Before lamination, clean the glass thoroughly using purified water, deionized water, industrial alcohol, or ethanol. Ensure that there are no black spots, watermarks, or fingerprints on the glass. Position the EVA film correctly: Place the EVA film on the bottom glass, ensuring it is plain and free of wrinkles. Then, place the other glass on top of the EVA film and use high-temperature-resistant tape to secure the pre-laminated glass. Cut the excess EVA film outside the pre-laminated glass without pulling it too hard to avoid damaging the film. Maintain proper spacing: When placing the pre-laminated glass in the silicone bag, ensure that each pre-laminated glass is spaced 3-5cm apart. This spacing helps with vacuuming and ensures uniform lamination. Consider the composition of EVA film: The composition of EVA film can affect its UV resistance and transparency. EVA films with a higher vinyl acetate content (up to 40%) tend to have better UV resistance and transparency. When selecting an EVA film, consider its composition to achieve the desired balance between UV protection and transparency.
By following these steps and considering the specific characteristics of EVA film, you can achieve a balance between UV protection and transparency in laminated glass.