What are the common injection molding processes used in the production of small home appliance shell injection parts?

Plastic is a synthetic or natural polymer, compared to metal, stone, wood, plastic products have the advantages of low cost, plasticity, etc. Plastic products are widely used in our lives, the plastics industry also occupies an extremely important position in the world today.

In recent years, some new plastic processing technology and new equipment have been applied in a large number of home appliances plastic products molding, such as precision injection molding, rapid molding technology, melt core injection molding technology, gas-assisted / water-assisted injection molding technology, electromagnetic dynamic injection molding technology and overlay injection molding technology.

In home appliance products, especially small appliance shell injection moulding parts are very common in our life. The following is a description of what injection moulding processes are available for small appliance shell injection moulded parts.


1. Precision injection moulding

Precision injection moulding requires a high degree of precision to ensure that the products have high accuracy and repeatability in terms of size and weight. Injection moulding machines using this technology can achieve high pressure and high speed injection.


2. Rapid prototyping technology

This technology has developed rapidly in line with the diversification of home appliances and their constant renewal, and is mainly used for the production of plastic housings for home appliances. The advantage of this technology is that small batches of plastic parts can be produced without the need for moulds.


3. Core injection moulding technology

This technique is often used for shaped cavities that require high cavity roughness and precision and cannot be processed by hollow or rotational moulding methods. The principle of this technology is that a core is formed to form the cavity and then the core is injection moulded as an insert.

The cavity is formed by the heating of the injection moulded part, which causes the core to melt and flow out. The most important aspect of using this technique is the need to know the core material and the melting point of the moulded part. Usually, the core material can be a general plastic, a thermoplastic elastomer or a low melting point metal such as lead or tin, depending on the situation.


4. Gas Assist Injection Moulding

This can be used to mould many types of injection moulded parts, the most typical product being the housing of a television set. During injection moulding, gas is injected into the cavity almost simultaneously with the plastic melt. At this point, the molten plastic covers the gas and the moulded plastic product is a sandwich structure, which can be released from the mould after the part has been shaped. These products have the advantages of material saving, low shrinkage, good appearance and good rigidity. The key part of the moulding equipment is the gas-assisted device and its control software.


5. Electromagnetic dynamic injection moulding technology

This technology uses electromagnetic forces to create reciprocating vibrations in the axial direction of the screw. This allows the plastic to be microplasticised during the preplasticisation phase, resulting in a denser structure and reduced internal stress in the product during the holding phase. This technique can be used to mould demanding products, such as discs.


6. Film overmoulding technology

In this technique, a special printed decorative plastic film is clamped into the mould before injection moulding. The printed film is heat deformed and can be laminated to the surface of the plastic part, which is not only beautiful but also eliminates the need for subsequent decorative steps.

In general, the demand for plastic moulds for home appliance plastic products is very high, and at the same time, the technical requirements for plastic moulds are high, as well as the processing cycle should be as short as possible, thus greatly promoting the development of mould design and modern mould manufacturing technology.

Post time: Nov-17-2022


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