What material is the sealing tape generally used for?
However, after corona treatment, BOPP film has good printing adaptability, can be printed in colorful, and has a beautiful appearance, so it is often used as the surface material of composite film. BOPP film is not enough, such as easy to accumulate static electricity, no heat sealability, etc. In high-speed production lines, BOPP films are prone to static electricity, and static removers are needed. In order to obtain a heat-sealable BOPP film, a heat-sealable resin glue, such as PVDC latex, EVA latex, etc., may be applied on the surface of the BOPP film after corona treatment, perhaps a solvent glue may be applied, perhaps extrusion coating or co- The extrusion lamination process produces heat-sealable BOPP films.
The film is widely used in the packaging of bread, clothes, shoes and socks, as well as in the covers of cigarettes and books. The initial tear strength of BOPP film after stretching is improved, but the secondary tear strength is very low. Therefore, there will be no cuts left on both end faces of the BOPP film, otherwise the BOPP film will be easily torn off during printing and lamination. After the BOPP coating is self-adhesive, we can produce our commonly used sealing tape. Sealing tapes are a market with many BOPPs.
BOPP film can be prepared by tubular film method or flat film method. The functions of BOPP films obtained by different processing methods are also different. The BOPP film produced by the flat film method has a higher stretch ratio (up to 8-10), so the strength is higher than that of the tubular film method, and the uniformity of the film thickness is also very good.
In order to obtain better comprehensive performance, it is usually produced by multi-layer composite method during use. BOPP can be combined with a variety of different materials to meet specific application needs. For example, BOPP can be combined with LDPE (CPP), PE, PT, PO, PVA, etc. to obtain high gas barrier properties, moisture resistance, transparency, high temperature, low temperature, retort resistance and oil resistance. Different composite films can be applied to oily food and expensive taste. Food, dry food, dipped food, all kinds of cooked food, monosodium glutamate, pancakes, rice cakes and other packaging.