The action of the pressure holding is to continue to exert pressure to the melt plastic, in order to increase the density of plastic to compensate for the shrinkage of plastic. In the process of pressure holding, the mold cavity…
Filling stage Filling is the first step in the process of injection molding; the filling time begins from the close of the plastic mold until the 95% filling of mold cavity. In theory, the shorter the filling time is, the…
Design of branch runner Branch runner is a melt flowing way connecting the main runner and the gate, which acts as the role of diversion and turning. The branch runner system of the side gate is on the parting line…
The concept of main runner The main runner is a conical section that connects injection molding machine nozzle to the branch runner, by which the molten plastic run into the mold cavities. And its diameter is closely related to the…
The function of the mold feed system is to make the high temperature melt under high pressure go into the mold cavity to fulfill that. The style and quantity of gate and feed style often determine the specifications of plastic mold…
Design principle of ejection system Product ejection is the last step of the injection process, the ejection quality will directly affect the quality of the product, and design should follow the principles. (1) The principle of equilibrium layout: ejector pins…
Local thick wall thickness, wrong position of gates and cooling layout would lead to sink marks, trapped air, deformation and burns on the injection parts, the following will analyze some factors: Wall Thickness: The wall thickness should keep same to…
In the injection molding, short-filling, trapped air burns, high internal stress, flow marks and weld lines and so on could be often seen. To solve those problems, the first consideration is the process setting, and the gate design also plays…
False Injection molding machine operation will cause poor quality, rejected plastic parts, lessen machine life and the damaged screw. The following lists a detailed and comprehensive description of the standard process to avoid misbehavior. A: Operational requirements Before starting to…
Prototype plastic components are generally employed to confirm the functionality of a designed component. The verification needs vary from size to loading, which is based on the end-use needs for the components. Components designed for engineering applications probably demand many…