Plastic Injection Molding

Why Injection Mold Need to Be Tested?

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.
mold making
After getting the […]

How to Adjust Injection Molding Process Parameters

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.
 
Temperature control
 
Thermocouples are […]

Common Problems in Transparent Plastic Injection Molding Process

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 […]

Brief Introduction of Injection Molding Process

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 […]

Four Reasons for Insufficient Filling of Injection Molding Products

Improper feed adjustment, lack of material.

 
Inappropriate feeding metering or abnormal operation of the feeding control system, abnormal injection cycle caused by injection molding machine or mold or operating conditions, small back pressure of pre-plastics or small particle density in the barrel may result in material shortage, for large particles, large voids and crystalline plastics such as polyethylene, polypropylene, nylon For example, ABS and high viscosity plastics such as dragon should be adjusted to a higher volume.
 
When the barrel end […]

Influence of Injection Molding Process Conditions on Plastic Products

Plastic material
 
The complexity of the properties of plastic materials determines the complexity of the injection molding process. And the performance of plastic materials varies greatly because of different varieties, brands, manufacturers, and even batches. Different performance parameters may lead to completely different molding results.
 
Injection temperature
 
The melt flows into the cooling cavity, dissipating heat due to heat conduction. At the same time, the heat generated by shearing may lose more or less heat than heat conduction, depending mainly on the […]

Causes and Solutions of Deformation of Injection Molded Parts

The possible reasons for the deformation of injection molded parts are:
 

bending is due to excessive internal stress in injection molded parts.

 

mold filling speed is slow.

 

plastic material in cavity is not enough.

 

plastic temperature is too low or inconsistent.

 

injection molded parts are too hot at the time of ejection.

 

the temperature of cooling is insufficient or the temperature of the moving and fixed die is inconsistent.

 

the structure of injection molded parts is unreasonable (such as stiffeners are concentrated on one side, but […]

Post Processing of Plastic Injection Products

Plastic parts can not be directly put into use after molding and demoulding, and some treatment is needed. Because this treatment is carried out after molding and demoulding, it is called post-processing. It is described as follows:
 

Trimming

 
After demoulding, the plastic parts always have some excess materials, such as gate flying edge, which bring disadvantage to the appearance and use of the plastic parts, so it needs to be removed. This kind of removal is relatively simple, and can be […]

Detailed Explanation of Five Parameters for Injection Molding

Injection molding is a kind of production behavior that plastic particles are molded into predetermined shapes by heating and melting. In this process, many factors of production have an important impact on the quality and production efficiency of the final plastic products.
 
Although different materials and different products have a variety of injection molding techniques, but we can summarize the process of injection molding parameters in the final product of the impact of various factors, so as to adjust the […]

Common Used Material Property of Injection Molded Part

PC: PC is the abbreviation of polycarbonate, with excellent electrical insulation, elongation, dimensional stability and chemical corrosion resistance, high strength, heat resistance and cold resistance, but also has self-extinguishing, flame retardant, non-toxic, coloring and other advantages.

Applications: Broad-wave transparent optical instruments; flame-retardant and environmentally friendly telecommunications appliances; surface metallized automotive parts; food containers with low residual harmful substances; anti-cracking and embrittlement medical devices
 
ABS: (ABS resin) (acrylonitrile-styrene-butadiene copolymer), good rigidity, high impact strength, heat resistance, low temperature resistance, chemical resistance, mechanical […]