Analysis Of The Causes Of Uneven Color Of Injection Molded Products The main reasons and solutions for the uneven color of injection molded products are as follows: (1) The colorant is poorly diffused, and this often causes a pattern to appear near the gate. (2) The plastic or colorant has poor thermal stability. To stabilize…
Matters Needing Attention In Heat Treatment Of Die-Casting Molds The heat treatment is to change the metallographic structure of the die-casting mold material by heating and cooling, and to obtain the necessary strength, hardness, toughness, dimensional stability at high temperature, thermal fatigue resistance, machinability and the like. When heat treatment of die-casting molds, attention should…
Form And Cause Analysis Of Die Casting Failure From the mold material, heat treatment, design, manufacturing and processing, from the die-casting process, production operations, mold maintenance and other aspects, to analyze the form that causes the mold failure. The main forms that cause the die-casting mold to fail are: 1. The alternating stress of thermal…
Three Ways Of Heat Treatment Of Mold The new process of die forging heat deformation heat treatment is gradually becoming familiar. Most of the die forging temperature is about 850 °C. After the last fire forging, it is not slow cooling, but cold quenching, and then high temperature tempering or spheroidizing annealing. Heat treatment can…
Defects And Solutions For Injection Molding Cracking is a common defect of plastic products, and the main reason is due to stress deformation. There are mainly residual stresses, external stresses, and stress deformations caused by the external environment. (1) Crack caused by residual stress Residual stress is mainly caused by the following three conditions,…
Production Process Characteristics Of Injection Molding Two-Color Products First, the two-color injection molding machine consists of two sets of plastic injection devices with the same structure and specifications. The nozzles need to have a special structure according to the production method, or two sets of molding dies having the same structure that can be rotated…
Two-Color Mold Structure The traditional two-color injection mold has two forms: “punch shift” and “punch rotation”. First, the “male shift” mold has two female molds and one male mold. When the first cartridge is shot, the punch is closed with the first die to complete the injection of the first plastic. After the first plastic…
Gas Assisted Injection Molding The gas-assisted injection molding system uses an inert gas (usually nitrogen) directly injected into the plasticized plastic in the cavity through the sectional pressure control system to expand the interior of the plastic part to create a hollow shape, but still keep the surface of the product intact. Gas-assisted injection molding…
Injection Molding: Process Analysis Of Six Recycled Plastics First,recycled low density polyethylene (LDPE) process LDPE, the scientific name of high-pressure polyethylene, generally refers to plastic packaging film. Such as: woven bag inner liner film, food packaging film, daily necessities packaging film, greenhouse film. Most of these films are natural, light blue, and black. It is…
Solutions For Shrinkage Of Plastic Parts The problem of shrinkage of plastic parts (surface shrinkage and internal shrinkage) is due to defects caused by insufficient filling of the melt when the thicker part is cooled. We often encounter situations where the pressure is increased, the water inlet is increased, the injection time is prolonged, and…