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  • 20 kinds of plastic processing molding characteristics full analysis

20 kinds of plastic processing molding characteristics full analysis

At present, as product designers, our plastic parts design stays on the number mold design, and more productive process design is at the plastic parts suppliers. But to achieve reasonably or even the best design, we still need to know about plastic processing.

1 Injection molding

Injection molding is a method of producing shapes for industrial products. Products are usually molded using rubber injection molding and plastic injection molding. Injection molding can also be divided into injection molding methods and die-casting methods.

An injection molding machine (referred to as an injection molding machine or injection molding machine) is the main molding equipment to make thermoplastic or thermosetting materials into various shapes of plastic products using plastic molding molds, injection molding is achieved through injection molding machines and molds.


2 Extrusion

Through the action between the extruder barrel and the screw, the material is thermoplasticized while being pushed forward by the screw, and is continuously pushed through the head to make various cross-sectional products or semi-products.

3 Blow molding

Blow molding, also known as hollow blow molding, is a rapidly developing method of plastic processing.

Thermoplastic resin by extrusion or injection molding of tubular plastic blanks, while hot (or heated to a softened state), placed in a counter-open mold, immediately after closing the mold in the blanks into the compressed air, so that the plastic blanks blowing and cling to the inner wall of the mold, after cooling off the mold, that is, to obtain a variety of hollow products.

4 Suction molding

Suction molding is a kind of plastic processing technology, the main principle is the spreading of plastic hard sheets heated to softness, using vacuum adsorption on the surface of the mold, cooling, and molding, and used in all walks of life as a technical process.


5 Molding

Molding, also known as compression molding or compression molding, is an operation in which powdered, granular or fibrous plastic is first placed into the mold cavity at molding temperature, and then closed and pressurized to make it molded and cured. Compression molding can be used for thermosetting plastics, thermoplastics, and rubber materials.

6 Calendering

The molten thermoplastic is passed through the gap of two or more parallel anisotropic rotating rollers so that the melt is extruded and stretched by the rollers to become a continuous sheet product with certain specifications and quality requirements and finally formed by natural cooling. The calendering process is often used in the production of plastic films or sheets.

7 Foaming

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


8 Wrap-around molding

The winding process is to wind continuous fiber (or cloth tape, prepreg yarn) dipped in resin glue onto the core mold according to a certain pattern, and then cured and demolded to obtain the product.

9 Laminated molding

Laminated molding is a molding process in which multiple layers of the same or different materials are combined as a whole under heating and pressure. It is commonly used in plastic processing, and also used in rubber processing.

10 Coating molding

Coating molding is the use of plastic sol or organic sol to coat the surface of substrates such as cloth or paper to make imitation leather products, lacquered cloth, or plastic wallpaper, or to coat powdered plastics with metal surfaces.

Common plastic-coated products include artificial leather, lacquered cloth, plastic wallpaper, and various metal-coated products.

11 Casting

Cast molding is a method of plastic processing. Early casting is to inject liquid monomer or prepolymer see polymer into the mold at atmospheric pressure, polymerization and curing molding into the same shape as the mold cavity products.

In the '60s appeared nylon monomer casting see polyamide with the development of molding technology, the traditional casting concept has changed, polymer solutions, dispersions refer to polyvinyl chloride paste, and melt can also be used for casting molding.

12 Drip molding

Drop molding is the use of thermoplastic polymer materials that have the characteristics of the state variable, that is, under certain conditions with the viscous flow, and at room temperature and can return to the characteristics of the solid-state, and the use of appropriate methods and special tools inkjet, in its viscous flow state as required to mold into the designed form, and then cured at room temperature molding.

13 Compression Molding Method

The compression molding method is mainly used for the production of thermosetting plastic products. The molding is heated to melt, pressurized to punch the mold, and then heated to cross-link and cure, and the products are obtained after demolding.

14 Resin Transfer Molding

Resin transfer molding is the process of injecting resin into a closed mold to infiltrate the reinforcing material and cure it. This technology can be used without prepreg, hot press tank, effectively reducing equipment costs, molding costs.

This technology has developed rapidly in recent years and is widely used in the aircraft industry, automotive industry, naval industry, and other fields, and research and development of RFI, VARTM, SCRIMP, SPRINT, and other branches to meet the application needs of different fields.

15 Extrusion

Extrusion is a pressure processing method in which a blank placed in a concave die is pressurized with a punch or a convex die to produce a plastic flow to obtain a part corresponding to the shape of the die's hole or concave-convex die.

During extrusion, a three-way compressive stress is generated in the billet, so that even a billet with low plasticity can be extruded and formed.

16 Thermoforming

Thermoforming is a special method of processing thermoplastic sheets into various products. A more specific plastic processing method for processing thermoplastic sheets into a variety of products.

The sheet is clamped on a frame and heated to a soft state, and under the action of an external force, it is pressed against the shape of the mold to obtain a shape similar to that of the shape. After cooling and shaping, the product is formed by trimming.

17 Hand Gluing

It is also called hand laminating molding and contact molding, which means that the plastic products are made by hand on the mold coated with a release agent, i.e., laying reinforcing material while painting resin until the thickness of the required plastic products, and then curing and demolding to obtain the plastic products.

18 Laser Rapid Prototyping

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 high replicability and interchangeability of prototypes; manufacturing process independent of the geometry of the manufacturing prototype; short processing cycle and low cost, generally reducing manufacturing cost by 50% and processing cycle by more than 70%; high technology integration to achieve the design and manufacturing integration.

19 Fused deposition molding method

Fused Deposition Modeling (FDM, FusedDepositionModeling), this process is performed by extruding filamentary materials such as thermoplastics, waxes, or metals from a heated nozzle and depositing the melt at a fixed rate by a predetermined trajectory for each layer of the part.

20 CNC

A CNC computer numerically controlled machine tool is an automated machine tool equipped with a programmed control system.

This control system is capable of logically processing a program with control codes or other symbolic instructions specified and decoding them to actuate the machine and machine the part.

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