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  • The process principle and requirements of high gloss injection molding

The process principle and requirements of high gloss injection molding

The process principle of high gloss injection molding.
The mold is heated up before and during the mold closing process, and after the mold closing is completed, the temperature reaches the set condition and the injection is carried out. During the injection process, the mold continues to maintain high temperature, so that the rubber can maintain good fluidity in the mold during the injection. When the injection is completed, the mold is cooled down during the pressure-holding and cooling process, which can greatly shorten the cooling time of the products and thus improve the production efficiency.

To produce high-quality high-gloss products, injection molding machines, molds, temperature control equipment high-gloss products special plastic, as well as boilers, cooling devices and other aspects with.

1. Configuration of the plastic machine

① The rigidity of the clamping mechanism should be good; because the whole production process should be constantly heating up and cooling down. Therefore, the clamping mechanism of the injection molding machine must be rigid and strong to ensure the accuracy and stability of the clamping force. In order to ensure the surface quality of the products.

② Choose a large clamping machine: In this process, the clamping force required to produce the product is larger because gas-assisted injection is no longer available.

③ Choose a smaller injection volume according to the situation: For example, when producing flat panel TVs, LCD bezels, etc., the injection volume does not need to be larger, so try to choose an injection molding machine with a small injection volume. The actual weight of the product is between 30% and 80% of the theoretical injection volume of the machine. If the injection volume of the machine is too large, the glue will stay in the barrel for a long time and decompose easily, and the surface of the product will have defects such as silver wire.

④ Equipped with a special screw to produce high-gloss products used in the plastic hardness is relatively high, the melt index is relatively low, so the screw plasticization is required to be good. At the same time, the shear of the screw should not be too large, otherwise the rubber will be easily decomposed.

2. Mould configuration

① The inner surface of the mold must have a very high degree of finish to ensure the surface quality of the product.

② The piping inside the mold must be opened reasonably to ensure that it can be warmed up and cooled down quickly.

③ The pipes inside the mold should have good thermal conductivity.

④ Since the production process requires constant heating and cooling, the steel chosen for the mold should be good.

⑤ Pay special attention to the maintenance of the mold in the process of use to ensure that it is dry and dust-free. 3.

3. configuration of temperature control equipment

① Temperature control should be very accurate, which is an important guarantee of product quality.

② The response of temperature control equipment should be very fast to ensure high production efficiency.

4. Specialized plastics

When producing products with high surface quality, the commonly used plastics are ABS, PC+ABS or PMMA+ABS, of which ABS has the lowest hardness and PMMA+ABS has the highest hardness, up to H or even 2 H. However, the higher the hardness, the lower the melt index. However, the higher the hardness, the lower the melt index, and the poorer the flowability, so the appropriate plastic can be selected according to the production needs.

Steamless high-gloss injection molding technology greatly improves the surface quality and surface strength of products, and can eliminate the subsequent spraying or painting processes, which not only protects the environment and operator's health, but also eliminates the expensive secondary processing costs by reducing the process, and saves energy and materials while significantly reducing production costs.
Last: Analysis of the injection molding process of polypropylene (PP) Next: Four tips for the maintenance of injection molds! 
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