According to the molecular structure and thermal properties of the resin, plastics are divided into thermoplastics and thermosetting plastics. The plastics commonly used in automotive interiors are mostly thermoplastics, mainly including PP, PE, PVC, PET, ABS, etc. PU, PA, PC, PBT, PS, etc. also have some applications. The common feature of these thermoplastics is that they can be melted when heated, and made into any shape, become solid after cooling, and can be melted and reused many times after heating.
Automobile dashboards are mostly made of PVC and ABS, and some PU foam is injected to enhance the resilience; the door inner panels are mostly injection molded with ABS or modified PP; the steering wheel is generally made of semi-rigid PU foam, and the steering wheel package The covering is mostly made of PP, PU, PVC, ABS and other resin materials.
Commonly used plastic molding processes mainly include injection molding, hollow blister molding, extrusion molding, blow molding, compression molding and other traditional processes, as well as micro-foam molding, injection compression molding, slush molding, two-color injection molding, and layered molding. New processes such as injection molding, as well as auxiliary processes such as welding, coloring/painting/plating, etc.
Compared with other materials, plastics are easy to form, have strong corrosion resistance, good coloring/plasticization/hardening properties, and low cost. The disadvantages of plastics are slightly poor weather resistance and poor aging resistance. Most of them are flammable (except for PBT and PFR), and an appr