The processing of automotive injection molded parts is a complex process, which can be divided into the following main processing methods: pre pressing to improve product quality and improve molding efficiency, etc., the operation of pre pressing powder or fibrous molding materials into a certain shape. Preheating is the operation of heating the molded plastic before molding to improve its processing performance and shorten the molding cycle. The operation of adding the required amount of plastic into the mold, closing the mold, venting, and maintaining it at the molding temperature and pressure for a period of time before demolding and cleaning the mold. The main equipment used for compression molding is presses and molds.

The most commonly used presses are self-contained hydraulic presses, with tonnage ranging from tens to hundreds of tons. There are down pressure presses and up pressure presses. The molds used for compression molding are called compression molds and are divided into three categories; Overflow mold, semi overflow mold, non overflow mold. The main advantages of compression molding are the ability to mold larger flat products and the ability to produce in large quantities. Its disadvantages are long production cycles and low efficiency. Laminated forming. The method of combining two or more layers of the same or different materials into a whole by heating and applying pressure, with or without adhesives. Lamination molding is commonly operated by a laminating machine, which has multiple layers of floating hot pressing plates between the dynamic and fixed pressing plates. The commonly used reinforcement materials for laminated molding include cotton cloth, glass cloth, paper, asbestos cloth, etc., and resins include phenolic, epoxy, unsaturated polyester, and some thermoplastic resins. Cold press molding. Cold pressing molding, also known as cold pressing sintering.

Healthy green plasticizer. All plastics cannot do without plasticizers. Biobased plastics. In the future, some universal plastic parts may all be replaced by bio based plastic parts. At present, composite materials of PLA (polylactic acid) and hemp have been formed and processed for automobile tire covers and car cushions. Polyethylene (PE) produced from sugarcane ethanol has a wide range of applications in automotive fuel tanks and interiors.

Natural fiber reinforced composite plastics. Natural fiber sources included include cellulose, wood, flax, jute, sisal, hemp, agave leaf fiber, coconut shell fiber, as well as straw and other crop waste. The use of natural fiber environmentally friendly materials has been recognized by the automotive industry. By using natural fiber reinforced composite materials such as linen and sisal, not only is the tensile strength and stiffness of the material not lower than that of glass fiber reinforced materials, but also because plant fiber is 40% lighter than glass fiber, it can reduce vehicle weight, reduce fuel consumption, and be easy to recycle.

Improper use of release agent in precision injection mold processing. In the processing and molding of precision injection molds, a small amount of release agent is generally evenly applied only to areas such as threads that are difficult to release. In principle, the amount of release agent should be minimized as much as possible. The material temperature of precision injection molding is too low, and the flow and convergence performance of low-temperature melt is poor, which is easy to form fusion marks. If the inner and outer surfaces of a plastic component produce fine fusion lines at the same location, it is often caused by poor fusion due to low material temperature. The temperature of the material barrel and nozzle can be appropriately increased, or the injection cycle can be extended to promote an increase in material temperature. At the same time, the amount of coolant passing through the mold should be controlled, and the temperature of the three color vertical injection mold should be appropriately increased. In general, the strength of the welded joints in plastic parts is poor. If local heating is applied to the corresponding parts of the automotive injection mold that produce welded joints, increasing the local temperature of the welded joints in the molded parts can often improve the strength of the welded joints in the plastic parts.