In the 21st century, with the rapid development of plastic film, the application fields of pvc heat shrinkable film are also increasing, including agricultural greenhouses, and product packaging, etc. The main reason why it can be so widely used is that it has the following advantages:
Wrap and package the goods stacked on the pallet to make the package more stable, tidy and waterproof;
It has high tensile strength, high elongation, good self-adhesion and high transparency;
Shrinkage film and heat shrinkable film are mainly extruded from several different grades of polyolefin resin, with puncture resistance, super strength and high performance;
The technology of heat-shrinkable film contact mainly refers to some main steps in the production of heat-shrinkable film blowing, such as extrusion, molding, cooling, traction and winding. The multi-layer plane superposition head mentioned in this paper will increase the output by 50% due to double the number of extrusion layers, large heat absorption area and good plasticizing effect.
PVC heat-shrinkable film has some shortcomings. For example, some PVC heat-shrinkable films are very soft when used in summer and become hard in winter; Some heat-shrinkable films are easy to absorb dust and become opaque; Some PVC heat-shrinkable films have a short service life, are easy to age, can not withstand wind, frost and sun exposure, and the surface is easy to crack. The disadvantages cannot be concealed. At present, PVC heat-shrinkable film is still widely used. I believe that with the technology of heat-shrinkable film becoming more and more mature, heat-shrinkable film will be applied in more fields.