plastic enclosure manufacturer

1. Shrinkage marks

Features: Shrinkage marks generally appear on the surface of the Plastic Parts Manufacturers, which is usually related to the shortening and detachment of the plastic from the mold surface.

Possible causes:
– The melt temperature is too low or too high.
– Insufficient plastic in the mold cavity.
– The surface in contact with the plastic is overheated during cooling.
– The runner design is unreasonable and the gate section is too small.

Solution:
– Adjust the temperature of the injection cylinder.
– Adjust screw speed to get the correct screw surface speed.
– Increase shot size.
– Ensure the correct padding is used, increase screw forward time, injection pressure and injection speed.

2. Encapsulation

Characteristics: Encapsulation can be seen in “air traps” in transparent injection molded parts, and may also occur in opaque plastics. It is usually related to thickness and is often caused by shortening of the plastic.

Possible causes:
– The mold is not fully filled.
– The stop valve is not operating properly.
– The plastic is not completely dry.

Solutions:
– Increase shot size.
– Increase injection pressure.
– Increase screw forward time.

The above content outlines the structure, design optimization and analysis and solutions of common problems of injection molds. I hope it can help related companies improve the quality and production efficiency of injection molded parts.

Analysis of injection molds and their design and maintenance

Plastic Parts Manufacturers are widely used in various products, especially automotive plastic parts. In the injection molding process, the design, structure and function of the mold are crucial. The following is a detailed analysis of various aspects of the injection mold.

1. Structure, composition, classification and function of injection molds

Injection molds are mainly composed of the following parts:
– Mold structure: including the upper mold, lower mold, gating system, cooling system, etc. of the mold.
– Classification: According to different applications and designs, molds can be divided into large gate molds, fine gate molds and hot runner molds, etc.
– Function: The main function of the mold is to inject molten plastic into the mold cavity and form the required plastic parts after cooling.

2. Optimization design of the gating system

The gating system includes gates, runners and cold wells, etc. Its optimized design can improve the molding quality of injection molded parts. The design should consider:
– The shape and position of the gate to ensure that the plastic flows smoothly into the mold cavity.
– The cross-section and length of the runner to reduce the flow resistance of the molten plastic.
– Design of cold well to avoid the influence of cold material on the quality of finished products.

3. Cooling system optimization design

The design of cooling system is crucial to the molding quality and production efficiency of injection molded parts. The optimization design should consider:
– The layout of water channels to ensure uniform cooling of all parts of the mold.
– The use of water baffles to improve the cooling effect.
– The application of beryllium barrels to enhance cooling efficiency.

4. Setting and adjustment of shrinkage rate

Shrinkage rate is an important factor affecting the dimensional accuracy of injection molded parts. When setting and adjusting the shrinkage rate, the material properties and molding process should be referred to to ensure that the finished product meets the design requirements.

5. The relationship between gating system, cooling system, mold structure and injection molding process

There is a close relationship between the gating system, cooling system and mold structure. Reasonable design can improve the efficiency of the injection molding process and the quality of the finished product. For example, the runner design directly affects the cooling effect, while uneven cooling may lead to warping and dimensional deviation of the finished product.

6. Installation, commissioning and maintenance of the mold

The correct installation and commissioning of the mold is the key to ensure the smooth progress of the injection molding process. Regular maintenance and care of the mold can extend its service life and ensure production efficiency.

7. Use chillers and mold temperature controllers to control the process

Chillers and mold temperature controllers are used to accurately control the mold temperature during the injection molding process, thereby optimizing the molding process and improving product quality.

8. Use CAE mold flow analysis technology to optimize mold design

CAE mold flow analysis technology can simulate the mold in the design stage, help identify potential problems and optimize them, and improve the design quality and production efficiency of the mold.