What are the common plastic processing techniques?

1. Injection molding is a method of industrial product production molding. Products usually use rubber injection molding and plastic injection molding. Injection molding can also be divided into injection molding, compression molding, and die-casting. Injection molding machine (abbreviated as injection molding machine or injection molding machine) is the main molding equipment that uses plastic molds to make various shapes of plastic products from thermoplastic or thermosetting materials. Injection molding is achieved through injection molding machines and molds.

2. A processing method in which extruded materials are continuously processed into various cross-sectional products or semi-finished products through the action between the extruder barrel and the screw, while being thermally plasticized and pushed forward by the screw.

3. Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. The tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin is placed in a split mold while it is hot (or heated to a softened state). After the mold is closed, compressed air is immediately introduced into the parison, causing the plastic parison to expand and tightly adhere to the inner wall of the mold. After cooling and demolding, various hollow products are obtained.

4. Blistering is a plastic processing process that mainly involves heating flat plastic hard sheets to soften them, using vacuum adsorption on the surface of the mold, cooling them to form, and applying them to various industries.

5. Molding, also known as compression molding or compression molding, is the process of first placing powdered, granular, or fibrous plastic into the mold cavity at the molding temperature, and then closing the mold to pressurize and solidify it. Molding can be used for both thermosetting plastics, thermoplastic plastics, and rubber materials.

6. Rolling forming is a method of forming thermoplastic materials by melting and plasticizing them through two or more parallel and opposite rotating roller gaps, causing the melt to be extruded, stretched, and formed into continuous sheet products with a certain size and quality requirements by the roller. Finally, it is formed by natural cooling. The rolling forming process is commonly used in the production of plastic films or sheets.

7. Foaming molding is the process of adding appropriate foaming agents to foaming materials (PVC, PE, PS, etc.) to create a microporous structure in plastics. Almost all thermosets and thermoplastics can be made into foam plastics, and foam molding has become an important field in plastic processing.

8. The winding forming process involves winding continuous fibers (or cloth tapes, pre impregnated yarns) soaked in resin glue onto the core mold according to a certain pattern, and then curing and demolding to obtain the product.

9. Lamination forming refers to the process of combining multiple layers of the same or different materials into a whole under heating and pressure. Commonly used in plastic processing and also in rubber processing.

10. Pouring molding is a method of plastic processing. Early casting was the process of injecting liquid monomers or prepolymers into a mold under normal pressure, and then polymerizing and solidifying them to form products with the same shape as the mold cavity. In the 1960s, nylon monomer casting emerged. With the development of molding technology, the traditional casting concept of polyamide has changed. Polymer solutions, dispersions refer to polyvinyl chloride paste and melts, which can also be used for casting molding.

11. Dropping molding is the use of thermoplastic polymer materials with variable state properties, that is, they have viscous flow properties under certain conditions and can recover solid properties at room temperature. Appropriate methods and specialized tools are used to spray ink to shape them into the designed shape according to requirements in their viscous flow state, and then solidified and formed at room temperature.

12. The compression molding method is mainly used for the production of thermosetting plastic products. The product is formed by heating it to melt, pressing it into a mold, and then heating it to cross-link and solidify it. After demolding, the product is obtained.

13. Resin transfer molding is a process method of injecting resin into a closed mold to impregnate reinforcing materials and solidify them. This technology does not require prepregs or hot pressing tanks, effectively reducing equipment costs and molding costs. This technology has developed rapidly in recent years and is widely used in fields such as aircraft industry, automotive industry, and shipbuilding industry. It has also developed various branches such as RFI, VARTM, SCRIMP, and SPRINT to meet the application needs of different fields.

14. Extrusion is a pressure processing method that uses a punch or punch to pressurize a blank placed in a concave mold, causing it to produce plastic flow, thereby obtaining a workpiece corresponding to the shape of the mold hole or concave convex mold. During extrusion, the billet generates three-dimensional compressive stress, and even the billet with lower plasticity can be extruded into shape.

15. Thermoforming is a special plastic processing method that processes thermoplastic sheets into various products. A special plastic processing method for processing thermoplastic sheets into various products. The sheet material is clamped on the frame and heated to a softened state. Under external force, it is tightly pressed against the mold surface to obtain a shape similar to the mold surface. After cooling and shaping, the product is finished after trimming.

16. Hand layup molding, also known as hand layup molding or contact molding, refers to the process of manually laying reinforcing materials on a mold coated with release agent, while brushing resin until the required thickness of the plastic product is reached, and then obtaining the plastic product through curing and demolding.

17. Laser Rapid Prototyping (LRP) is a new manufacturing technology that integrates advanced technologies such as CAD, CAM, CNC, laser, precision servo drive, and new materials. Compared with traditional manufacturing methods, it has the following advantages: high reproducibility and interchangeability of prototypes; The manufacturing process is independent of the geometric shape of the manufacturing prototype; Short processing cycle, low cost, general manufacturing costs reduced by 50%, and processing cycle shortened by more than 70%; Highly integrated technology, achieving integrated design and manufacturing.

18. Fused Deposition Modeling (FDM) is a process that involves extruding a filament of a filamentous material such as thermoplastic, wax, or metal from a heated nozzle and depositing the melt at a fixed rate according to the predetermined trajectory of each layer of the part.

19. CNC computer numerical control machine tool is an automated machine tool equipped with a program control system. This control system can logically process programs with control codes or other symbolic instructions, and decode them to make the machine move and process parts.

20. 3D printing (3DP) is a type of rapid prototyping technology that is based on digital model files and utilizes adhesive materials such as powdered metal or plastic to construct objects through layer by layer printing. 3D printing is usually achieved using digital technology material printers. It is often used in mold manufacturing, industrial design, and other fields to manufacture models, and gradually used in the direct manufacturing of some products. There are already components printed using this technology.

The above is an introduction to the plastic processing technology of common plastic bag making machines. For more information, please follow this website