Since mankind entered the industrial society, the production of all kinds of products has got rid of manual work. Automated machine production has been popularized in all walks of life, and the production of plastic products is no exception. Nowadays, plastic products are processed by injection molds with injection molding machines, such as those common in our daily life. All kinds of household appliances and digital products are processed by injection molding. How is a complete plastic product poruduced in the […]
From three points, we can see the quality of injection parts.
First, look at the appearance
Seewhetherthe injection parts are complete and whether they are deformed or not;
Whether the injection parts are uniform in color, whether there is obvious color difference, and whether the color is bright and translucent.
Second, touch the product
Touch the the surface of the injection part to see whether smooth, and whether there are burrs around the handle;
Whether theinjection parts have been naturally aged, the aging is reflected in […]
1) plastic materials
The complexity of plastic material properties determines the complexity of injection moulding process. The performance of plastic materials varies greatly with varieties, brands, manufacturers and even batches. Different performance parameters may lead to completely different forming results.
2) injection temperature
The melt flows into the cooling cavity and loses heat due to heat conduction. At the same time, the heat generated by shearing may be more or less than the heat dissipated by heat conduction, mainly depending on the […]
There are several ways to print or design the surface of plastic products.
1. Screen printing
This method is the most common and widely used one; it is generally suitable for flat or radian printing.
Principle of surface printing
Surface printing is to put the ink into the gravure with words or patterns carved, then copy the words or patterns onto the surface, then use the surface to transfer the words or patterns to the surface of the product, and finally solidify […]
In the development of automotive industry, the demand for plastic parts is increasing day by day, because the application of automotive construction to plastic parts is very high, that is to say, the quality of plastic parts has a huge role in promoting the development and construction of the automotive industry, which requires the production of plastic parts in need of quality assurance, and determines the quality of plastic parts. It is the mold. There are not a few cases that the […]
In the process of injection molding, processing holes play different roles on different sliders. In the front part of the product, the clamping line between the slider and the cavity is on the parting line, and the product is formed by the big slider around the product. Four clamping lines are formed at the interface between the sliders on the appearance surface of the product.
In order to ensure the smooth line between some sliders and the cavity and between the […]
Most of the defects of injection molded parts are caused by the plasticization and injection stage of injection molded parts, but sometimes unreasonable design. The influencing factors include the type of injection inlet, the number of mold cavities, position and size, the design of cold/hot runner system and the structure of the product itself. Therefore, in order to avoid the product defects caused by mold design, we need to analyze the injection mold during the production.
After getting the […]
The measurement and control of temperature is very important in injection molding. Although these measurements are relatively simple, most injection moulding machines do not have sufficient temperature pick-up points or circuits. In most injection molding machines, the temperature is induced by thermocouples. A thermocouple is basically made up of two ends of different wires. If one end is hot than the other, it will produce a tiny telegram; the more heated it is, the stronger the signal.
Thermocouples are […]
Transparent plastics, because of their high transmittance, are bound to require strict surface quality of plastic products, and can not have any defects such as markings, pores, whitening, fog halo, black spots, discoloration, poor gloss, etc. Therefore, in the entire injection molding process, the design of raw materials, equipment, molds, and even products should be paid great attention to and put forward strict. To special requirements. Secondly, transparent plastics are mostly of high melting point and poor fluidity, so […]
The injection molding process includes preparation before molding, injection process and post-processing of plastic parts.
Preparations before molding include the inspection of raw material appearance and the determination of technological properties, preheating and drying, cleaning of injection machine barrel, preheating of inserts and selection of release agent when demoulding is difficult. Sometimes it is necessary to preheat the mold.
During molding, powdered or granular materials are fed from the hopper into the high-temperature barrel for melting and plasticizing to become viscous […]