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Home » What is the production process of plastic injection mould?

GOODBO MOULD LIMITED , located in Bao'an District, Shenzhen, Guangdong Province, China, currently has over 200 employees and produces around 400-600 sets of various plastic injection molds, including communicating equipments,office appliances,medical instruments,home appliances , annually. We are a private enterprise specializing in the production of high-quality molds. The company is currently engaged in Mock up sample,Mold standard components,Plastic mold,Die Casting Mold,Blow Molding,Plastic injection  design, research and development, and manufacturing. 

What is the production process of plastic injection mould?

1. Design and Development: The first step in the production process of plastic injection mould is the design and development phase. This involves creating a 3D model of the desired plastic part using computer-aided design (CAD) software.

2. Material Selection: The next step is to select the appropriate material for the injection mould. This will depend on the type of part being produced, its application, and the desired properties of the final product.

3. Mould Design: Once the material is selected, the mould design process begins. This involves creating a detailed design of the injection mould, including the cavity, core, runners, and ejector system.

4. Machining: After the mould design is finalized, the mould components are manufactured using CNC machining or other techniques, such as milling or EDM (electrical discharge machining).

5. Injection Moulding Machine Set-Up: The mould is then mounted on an injection moulding machine, which is specially designed for injecting molten plastic material into the mould at high pressure.

6. Plastic Material Preparation: The plastic material used for injection moulding needs to be granulated and fed into the machine hopper. It is then heated and melted to a specific temperature and viscosity.

7. Injection: The plastic material is injected into the mould cavity at high pressure using an injection screw. The material flows and fills the entire cavity, taking the shape of the mould.

8. Cooling and Solidification: Once the mould is filled, it is left to cool and solidify. This is a critical step to ensure that the plastic part retains its shape and does not warp.

9. Ejection: After the plastic part is solidified, the mould is opened, and the part is ejected using an ejector pin system.

10. Trimming and Finishing: The ejected part is then trimmed to remove any excess material or flash. The final finishing touches, such as sanding or polishing, may also be done at this stage.

11. Quality Control: Before the parts are packaged, they undergo a quality control inspection to ensure that they meet the required specifications and standards.

12. Packaging and Shipping: The final step is to package the plastic parts and ship them to the customer or assembly plant for further use.

What common plastic materials are suitable for plastic injection mould processing?

1. Polypropylene (PP)

2. Polyethylene (PE)

3. Polystyrene (PS)

4. Acrylonitrile Butadiene Styrene (ABS)

5. Polyvinyl Chloride (PVC)

6. Polycarbonate (PC)

7. Nylon (PA)

8. Acetal (POM)

9. Polyethylene terephthalate (PET)

10. Polyurethane (PU)

What are the advantages and disadvantages of products processed using plastic injection mould?


1. Cost-effective: Plastic injection moulding is a cost-effective manufacturing method as it allows for mass production of products at a lower cost.

2. High production rate: The process of plastic injection moulding is quick and efficient, allowing for a high production rate of products.

3. Versatile design options: With plastic injection moulding, products can be designed with intricate details and complex shapes, providing a wide range of design options.

4. Consistency and accuracy: The use of moulds ensures that each product is consistent in shape, size and quality, resulting in high precision and accuracy.

5. Low waste: The materials used in plastic injection moulding are melted and re-used, resulting in minimal waste during the manufacturing process.

6. Durability: Plastic injection moulded products are highly durable and can withstand harsh environments and extreme temperatures.

7. Reduced manual labor: The process is highly automated, reducing the need for manual labor and improving production efficiency.


1. High initial cost: The initial cost of creating customised moulds can be high, making it less feasible for low production quantities.

2. Limited material options: Plastic injection moulding is limited to certain types of materials such as thermoplastic, making it less suitable for products that require different materials.

3. Design limitations: The design of the product must consider the limitations of the mould, which can restrict the product's shape and design.

4. Parting lines: The mould often creates visible parting lines on the product, which may affect its appearance and quality.

5. Material waste: While plastic injection moulding creates less waste during production, there is still some waste generated from trimming excess material.

6. Equipment and maintenance costs: The machinery and equipment required for plastic injection moulding can be expensive, and regular maintenance is necessary to ensure proper functioning.

7. Environmental impact: Although plastic injection moulding is more efficient and produces less waste, it still relies on the use of plastic, which can be harmful to the environment if not properly disposed of or recycled.

What common problems will be encountered during the production process of plastic injection mould?

1. Mould Design Issues: The design of a plastic injection mould is crucial for the success of production. Any flaw or error in the design can result in product defects or malfunctioning.

2. Material Selection: Choosing the right material for the mould is important in order to produce high-quality products. The wrong material can result in warping, shrinkage, or poor mechanical properties.

3. Injection Moulding Machine Problems: The machine used for injection moulding may encounter problems such as malfunctioning heating or cooling system, inadequate pressure or temperature control, or mechanical failures.

4. Air Traps and Weld Lines: These are common defects in plastic injection moulding due to the improper flow of molten plastic, resulting in bubbles or weak points in the final product.

5. Gate Design and Placement Issues: The design and location of the gate, which is the entryway for the molten plastic into the mould, can cause aesthetic or structural defects in the final product.

6. Burn Marks: These are dark marks or discoloration on the surface of the product caused by overheating of plastic during the injection process.

7. Warping and Shrinkage: These are common problems in plastic injection moulding, especially with large or thick parts. They occur due to uneven cooling or inadequate pressure during the process.

8. Sink Marks: These are depressions or hollows on the surface of the product caused by uneven cooling or inadequate packing pressure.

9. Ejection Problems: Difficulties in removing the final product from the mould can cause damage or defects.

10. Environmental Factors: Changes in temperature, humidity, or moisture levels can affect the quality and consistency of the final product, especially with certain types of plastic materials. 

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