PVC materials are environmentally friendly, corrosion-resistant, and chemically stable, and are widely used in the manufacture and production of PVC packaging bags. The PVC bag factory below will briefly introduce the molding characteristics of PVC materials.
1. Amorphous material, low moisture absorption and poor fluidity. In order to improve fluidity and prevent air bubbles, the plastic can be pre-dried. The mold casting system should be short and thick, the gate section should be large, and there should be no dead angle. The mold must be cooled and the surface is chrome-plated;
2. Due to its corrosive and fluid characteristics, it is best to use special equipment and molds. All products must be added with different types and amounts of additives as needed;
3, it is easy to decompose, it is more easy to decompose with steel and copper at 200 °C, and it will escape corrosion when decomposed. Irritant gas. The molding temperature range is small;
4. When using the nozzle of the screw injection machine, the aperture should be large to prevent the dead angle from stagnation. It is best not to have the insert. If there is an insert, it should be preheated.
The molding properties of PVC materials are mentioned here. Finally, the PVC bag factory concluded that PVC (polyvinyl chloride) is a material that is flame retardant, has good chemical stability and produces only low tensile internal forces. At the same time, its material properties include high strength, high stiffness and high hardness. The working temperature ranges from minus 15 degrees to 60 degrees, and it can be bonded and welded.