Tag - china plastic injection molding

How to match color of plastic masterbatch

The color matching of plastic color masterbatch is based on the three basic colors of red, yellow and blue, to match the colors that are pleasing, meet the color difference requirements of the color card, economical and can not change color when used after processing. In addition, plastic coloring can also give plastics a variety of functions, such as giving plastics some special functions; Improve the light resistance and weatherability of plastics, such as conductivity, antistatic; Different color agricultural […]

Characteristics of insert molding

Insert molding is a molding method for the integrated product by injecting resin into the pre prepared dissimilar inserts in the mold, and the fusion materials are bonded and solidified with the inserts.
Out SERT molding on the substrate refers to the method of embedding the injection molding parts on the metal plate surface.
The two molding methods are essentially the same. Its characteristics are as follows.
1. The composite of the resin’s formability, bending property and metal rigidity, strength and heat […]

Necessary for maintenance of injection molding machine

The core of injection molding machine maintenance work is fault judgment and fault handling. It involves a wide range of knowledge, a large degree of complexity, and has a certain depth (such as the level of comprehensive professional knowledge). We should have the basic knowledge of mechanical equipment maintenance, hydraulic maintenance and electrical maintenance. In fact, the maintenance work of injection molding machine is hard, but it is also a process of continuous learning and enterprising. As long as […]

Characteristics and injection molding process of transparent materials commonly used in plastics

Because of the light weight, good toughness and easy to form. The cost is low. In modern industry and daily products, more and more plastics are used instead of glass, especially in optical instruments and packaging industries, and it has developed rapidly. But because of the requirements of its transparency, wear-resistant parts to be high, impact toughness is better, back to the plastic composition, injection molding process, equipment. A lot of work should be done to ensure that the […]

ABS performance

The versatility of ABS comes from its three monomers, propylene, butadiene and styrene; B stands for butadiene, providing toughness and impact properties; S stands for styrene, providing rigidity and processability. ABS has excellent flowability and comprehensive properties.
Yellowish granular or bead resin. Non toxic, tasteless. Melting temperature 210 ~ 240 ℃, thermal decomposition temperature more than 250 ℃, density 1.03 ~ 1.07 / ^ 3. Soluble in aldehydes, ketones, esters and some chlorinated hydrocarbons. Insoluble in most alcohols and hydrocarbons. […]

Discussion on the causes of yellowing of plastic products

Generally speaking, the yellowing of plastic products is caused by the aging or degradation of materials. Generally, PP is caused by aging (degradation). Due to the existence of the upper side group of polypropylene, its stability is not good, especially in the case of light. Generally, light stabilizers are added. As for PE, because there is no side base, there is not a lot of yellowing at the initial stage of processing or use. PVC will turn yellow, which […]

Common problems and treatment after adding color masterbatch in injection molding

Under the sunlight, there are striped pigment bands in the products. This problem should be considered from two aspects: the physical and mechanical properties of plastics and the molding process of plastics
1. The temperature of the injection molding equipment is not well controlled, and the color masterbatch cannot be fully mixed with the resin after entering the mixing chamber.
2. Injection molding machine did not add a certain back pressure, screw mixing effect is not good.
3. Poor dispersion of Color […]

Injection molding process of PC material

PC has excellent performance, high transparency, good impact toughness, creep resistance, wide range of temperature. The process characteristics of PC are: the sensitivity of melt viscosity to shear rate is small, but it has great sensitivity to temperature, no obvious melting point, high viscosity of melt, easy hydrolysis of resin at high temperature and easy cracking of products. In view of these characteristics, we should pay special attention to the different treatment: to increase the fluidity of the melt, […]

Causes of color and luster defects of injection molded products

Under normal circumstances, the surface gloss of injection molded parts is mainly determined by the type of plastic, colorant and surface finish of the mold. But often because of some other reasons, the surface color and luster defects of products, surface dark and other defects. The causes and solutions are as follows:
(1) Poor finish of the mold, rust on the surface of the cavity, poor exhaust of the mold.
(2) The pouring system of the mould is defective, so it […]

Weld marks of forming defects

Weld mark
The fusion joint melt plastic in the cavity is confluent in multiple strands due to the penetration hole, the flow rate is not consistent, and the area where the filling material flow is interrupted. This kind of fusion of low temperature molten material can not fully fuse and produce linear fusion joint. In addition, the injection filling of the gate will also produce the fusion joint. This kind of weld mark only occurs at the fusion part of […]