Find a huge selection of Waterproof PP Shrink Wrap from China at Xiamen Guanhua. In different application areas, the function of film products is also different, which requires the use of different polymer materials, different processing methods, different production processes to produce film products with specific functions, now the most common several stretched films are mainly: Polypropylene (PP) film, polyester (PET) film, polyethylene (PE) film, polytetrafluoroethylene (PTFE) film, etc. The main application areas of Waterproof PP Shrink Wrap are shown in the following below:
(1) Blown film process: the polymer melt is blown into a tubular film, in this process, the melt will be affected by axial and circumferent forces, blown film (IPP) processing process is simple, short processing process and less equipment investment, is the new direction of Waterproof PP Shrink Wrap development, the current domestic market demand for IPP growing.
(2) casting process: formed by extrusion casting process production and processing, which belongs to non-directional flat extrusion film. Casting film (CPP) only has different degrees of orientation in the drawing direction, which is mainly caused by the production process. The melt casting is cooled quickly by the cold roll, and the film has excellent finish and clarity. CPP film has the advantages of good transparency, good stiffness, good moisture insulation, excellent heat resistance, easy heat sealing, etc. Compared with BOPP film, the obvious shortcomings are limited width and insufficient vertical and horizontal mechanical properties.
(3) two-way drawing process
Waterproof PP Shrink Wrap melt is first made into sheet or thick film through the long and narrow head, and then in the special drawing machine, at a certain temperature and a set speed, at the same time or step by step in the vertical two directions (longitudinal, transverse) of the stretching, and after appropriate cooling or heat treatment or special processing (such as corona, coating, etc.) the final product of BOPP film is made.