19 kinds of plastic molding processes

- Nov 22, 2020-

19 kinds of plastic molding processes


The manufacturing process of most cosmetic packaging materials is mainly through the four key processes of mold molding, surface treatment, printing, and assembly. The molding process is an indispensable key part.

Plastic molding is the process of making various forms (powders, pellets, solutions and dispersions) of plastics into products or blanks in the desired shape.


  1. Injection molding

    Injection molding is a method of producing shapes for industrial products. Products usually use rubber injection molding and plastic injection molding. Injection molding can also be divided into injection molding compression method and die casting method. Injection molding machine (abbreviated as injection machine or injection molding machine) is the main molding equipment that uses plastic molding molds to make plastic products of various shapes. Injection molding is realized by injection molding machines and molds.

    Injection molding cream jar cap.jpg

    flat top cream jar cap from our company

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    oval top cream jar cap from our company


  2. Extrusion molding

    Through the action between the barrel and screw of the extruder, the material is heated and plasticized, and pushed forward by the screw, and continuously passed through the head to make various cross-section products or semi-products.


  3. Rotational molding

    Also known as rotational molding, rotational molding, rotational molding, rotational casting, rotational molding, etc. The molding method is to first add the measured plastic (liquid or powder) into the mold, and after the mold is closed, make it along the two sides The vertical rotation axis rotates while heating the mold. Under the action of gravity and thermal energy, the plastic raw materials in the mold are gradually uniformly coated and melted and adhered to the entire surface of the cavity, forming the same shape as the cavity. After cooling, shaping and demolding, products with the desired shape are obtained.


  4. Blow molding

    Also called hollow blow molding, it is a rapidly developing plastic processing method. The tubular plastic parison obtained by extrusion or injection molding of the 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 injected into the parison to blow the plastic parison It expands and clings to the inner wall of the mold, and after cooling and demolding, various hollow products are obtained.


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    PET plastic bottle from our company

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    PET plastic bottle from our company


  5. Blister molding

    A plastic processing technology, the main principle is to heat the flat plastic hard sheet to soften it, adopt a vacuum adsorption on the surface of the mold, cool it to form, and apply it to all walks of life.


  6. Compression molding

    Also known as compression molding or compression molding, it is an operation that first puts powdered, granular or fibrous plastic into the mold cavity at the molding temperature, and then closes the mold and presses it to form and solidify. The compression molding can be used for both Thermosetting plastics, thermoplastics and rubber materials.


  7. Calendering

    The melted and plasticized thermoplastic is passed through the gap of two or more parallel and counter-rotating rollers, so that the melt is squeezed and stretched by the rollers to become a continuous sheet product with certain specifications and dimensions and quality requirements. Natural cooling method. The calendering process is often used in the production of plastic film or sheet.


  8. Foam molding

    It is the process of adding appropriate foaming agent to foaming materials (PVC, PE, PS, etc.) to make the plastic produce a microporous structure. Almost all thermosetting and thermoplastic plastics can be made into foam plastics, and foam molding has become an important field in plastic processing


  9. Winding

    The process is to wind the continuous fiber (or cloth tape, prepreg yarn) impregnated with resin glue on the core mold according to a certain rule, and then solidify and demold to obtain the product.


  10. Lamination

    It refers to a molding process that combines multiple layers of the same or different materials into a whole under heating and pressure. Often used in plastic processing, but also in rubber processing.



  11. Coating molding

    It is a process of using plastisol or organosol to coat the surface of substrates such as cloth or paper to make imitation leather products, varnished cloth or plastic wallpaper, or to coat powdered plastic on metal surfaces. Common plastic coating products include artificial leather, varnished cloth, plastic wallpaper and various metal coating products


  12. Pouring molding

    It is a method of plastic processing. In the early casting, liquid monomers or prepolymers were injected into the mold under normal pressure, and after polymerization, it was solidified and formed into a product with the same shape as the cavity of the mold. In the 1960s, nylon monomer casting appeared. With the development of molding technology, traditional casting concepts have changed. Polymer solutions and dispersions refer to polyvinyl chloride pastes and melts can also be used for casting.


  13. Drop moulding

    The technology is to use thermoplastic polymer materials with variable state properties, that is, they have viscous fluidity under certain conditions, and they can restore solid properties at room temperature, and use appropriate methods and special tools to ink jets. It is shaped into the designed form according to the requirements in the state, and then cured and shaped at room temperature.


  14. Cold press molding

    It is a kind of compression molding. Different from ordinary compression molding, the material is pressure-molded at room temperature. After demolding, the molded product can be reheated or cured by chemical action


  15. Compression molding

    Mainly used in the production of thermosetting plastic products. The molding is heated to melt, press the die, and then cross-link and solidify through heating, and the product is obtained after demolding


  16. Resin transfer molding

    It is a process of injecting resin into a closed mold to infiltrate and solidify the reinforcing material. This technology eliminates the need for prepregs and autoclaves, effectively reducing equipment costs and molding costs.

    This technology has developed rapidly in recent years and has been widely used in the aircraft industry, automobile industry, shipbuilding industry and other fields. It has researched and developed RFI, VARTM, SCRIMP, SPRINT and other branches to meet the application needs of different fields.


  17.  Extrusion molding

    It is a pressure processing method in which a punch or a punch is used to pressurize the blank placed in a concave mold to produce plastic flow, thereby obtaining a part corresponding to the shape of the mold hole or concave and convex mold. When extruding, the billet produces three-way compressive stress, and even the billet with lower plasticity can be extruded.


  18. Thermoforming

    It is a special plastic processing method for processing thermoplastic plastic sheets into various products. A special plastic processing method for processing thermoplastic plastic sheets into various products. The sheet material is clamped on the frame and heated to a softened state, and under the action of external force, it is made to close to the molding surface of the mold to obtain a shape similar to the molding surface. After cooling and shaping, the finished product is finished.


  19. 3D printing

    It is a kind of rapid prototyping technology, which is based on digital model files, using powdered metal or plastic and other adhesive materials to construct objects by printing layer by layer. 3D printing is usually achieved using digital technology material printers. It is often used to make models in mold manufacturing, industrial design and other fields, and then gradually used in the direct manufacturing of some products. There are already parts printed using this technology.

    There are many different technologies for 3D printing. The difference between them lies in the way the materials are available and the construction of different layers to create parts. Commonly used materials for 3D printing include nylon glass fiber, polylactic acid, ABS resin, durable nylon materials, gypsum materials, aluminum materials, titanium alloys, stainless steel, silver plating, gold plating, and rubber materials.