Injection molding is an efficient plastic processing technique. Its principle involves heating and melting granular plastic in a barrel, then injecting it under high pressure via a screw into a closed mold cavity. After cooling and solidification, the mold opens to remove the finished product. This process is fast, highly precise, and capable of mass-producing complex-shaped components, widely used in automotive, electronics, and consumer goods industries.

TPE (Thermoplastic Elastomer) is an environmentally friendly material that combines the elasticity of rubber with the processability of plastic. Its characteristics include excellent flexibility, low-temperature resistance, fatigue resistance, repeatable processing, and no need for vulcanization, making it easy to recycle. It is widely used in automotive parts (sealing strips), electronic products (waterproof components), medical devices (hoses), daily necessities (tool handles), and sports equipment, making it an ideal alternative to traditional rubber.

Extrusion molding is a continuous plastic processing technique. The process involves heating, melting, and plasticizing plastic raw materials in an extruder, then continuously extruding the melt through a rotating screw from a die head with a specific shape. It is subsequently cooled and shaped into products with a constant cross-sectional profile. This method offers high production efficiency and is primarily used for manufacturing pipes, sheets, films, profiles, and wire and cable coatings.

Two-color injection molding is a precision process that involves injecting two different colors or types of materials sequentially or simultaneously into the same mold using a specialized injection molding machine to form a single integrated component. This process typically employs a rotating mold, where after the first injection molding cycle, the mold rotates 180 degrees for the second injection, ensuring a strong bond between the two materials. It not only achieves a perfect combination of dual colors or multiple materials (such as soft and hard plastics) but also significantly enhances the product's aesthetics, tactile feel, and functionality. It is widely used in industries such as electronics, automotive, and medical fields.

The preparation of toughening agents typically employs melt grafting or chemical modification processes. Using thermoplastic elastomers (such as POE, EPDM) as the base material, grafting reactions with monomers like maleic anhydride are carried out in a twin-screw extruder to produce functionalized toughening agents. This process introduces polar groups, significantly improving compatibility with engineering plastics (such as nylon, PBT), thereby efficiently enhancing the impact toughness of the final products.

Blow molding is a common process used for manufacturing hollow plastic products, primarily divided into three types: extrusion blow molding, injection blow molding, and stretch blow molding. The basic principle involves placing a molten plastic parison into a mold, using compressed air to inflate it so that it conforms to the mold cavity wall, and then cooling and shaping it to obtain a hollow product. This process offers high production efficiency and low cost, and is widely used in producing various bottles, pots, barrels, and industrial hollow components.