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Blog
why cooling important for injection molding
Injection molding is a manufacturing process for producing parts by injecting molten material into a mold. Injection molding can be performed with a wide variety of materials, including metals, alloys, glass, elastomers, and most commonly thermoplastic and thermosetting polymers. Material…
pressure holding-injection molding
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-injection molding process
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
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…
Design principles of runner
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…
feed system of plastic mold
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
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…
How to Choose the Wall Thickness
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…
How to vent the plastic mold
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…