Warm Global Customers
With China Plastic Machinery
With China Plastic Machinery
Understanding the process properties of materials is very necessary for determining reasonable processes, selecting appropriate processing equipment, correctly designing molds, and thus preparing perfect products. Most plastic processing and molding is in a molten state. The molten plastic is formed into a plastic part in the mold cavity. After the plastic part is taken out of the mold and cooled to room temperature, the size of each part of the plastic part is smaller than the original size in the mold. This property is called shrinkage.
The main reason for the shrinkage of thermoplastic materials is related to the change in volume of plastics at different temperatures and the elastic recovery of plastics. Plastic shrinkage manifests itself in various forms. First, the dimensional shrinkage of plastic parts is manifested as the difference in the dimensions of the parts and molds in different directions. The reason is that the volume of plastics at different temperatures is different. Secondly, the shrinkage of plastic parts is directional. Different flow causes different orientations. Elastic recovery will cause different flow directions to shrink differently. There is also post-shrinkage and post-processing shrinkage of plastic parts, which is mainly due to the recovery of macromolecular chains that slowly occurs during post-processing and use.
If you are interested in our company and machine, feel free to contact our sales engineer. We will contact you as soon as possible.