Apr 9, 2019
In the plastic industry, different materials (components) are used frequently to create parts with more functionality.
For example:
Components with a different material (e.g. metal) are inserted into the mold before injection molding.
This is done manually or with a robot.
It is important to hold the insert in the correct position until the plastic flows around and fixes the part.
The encapsulation allows a strong connection between insert and part, and both will be ejected as one.
Injection Molding Process: The Inserts (metal connectors) encapsulated by plastic.
Related topics:
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Jan 15, 2020
A process in which fine powdered material with high melting point (>1.000°C) is mixed with thermoplastic based binders to a moldable compound is called powder injection molding.
The powdered material comes preferred wise in globular shape and corn sizes of 15 µm – 20 µm. The binder is incapsulating the powdered corn.
Volumetric share: Binder > 20 % / powdered material
Nov 29, 2018
The injection mold is usually temperated during the complete cycle.
The time from the end of packing phase until ejection is called residual cooling time (blue line in the time-pressure diagram below).
During this time the cooling of the part takes place solely.
Apr 8, 2019
A plug-on injection unit to an existing injection molding machine used for multicolor or multicomponent molding is called Secondary Injection Unit.
It is equipped with its own controller and is flexible in installation. It can be mounted on top or on non-operator side of a tool. The Secondary Injection Unit can inject into the parting line as cold runner system or into a hot runner system.
Nov 9, 2018
Especially for big parts as well as if weld lines shall be avoided sequential injection is useful.
This means that valve gates will be opened and closed one after the another.
Weld lines can be avoided by overflow the gate before opening it.
The quality of the part is improved.
Short flow length make it possible to reduce the filling pressure.
Opening and closing single gates allows to get the packing pressure in requested areas.
