Feb 20, 2024
In the plastics industry, a specific heat treatment process is essential to improve the performance and quality of injection-molded components.
This process, which is applied after injection molding, involves carefully heating the plastic parts to a precise temperature,
followed by a controlled cooling process.
The aim is to relieve internal stresses within the parts that can arise during the injection molding process.
This treatment not only improves the physical properties of the plastic products, such as flexibility and impact resistance,
but also increases their resistance to environmental influences and mechanical stresses.
The result is a significant increase in product quality and durability, which is beneficial for manufacturers and end users alike.
Mar 14, 2023
If a cold runner is used and an automated separation between part and runner is wanted, a tunnel gate can be used.
In this case the gate will be on the side of the part or a rib.
The tappered shape leads to a small gate size on the part surface and allows a good removal of the cold runner during mold open.
A baffle wall at the end of the tunnel is used to collect cold melt at the start of injection.
The separation between runner and part is possible by using a standard two plate mold.
Often there is a positive impact to the parts appearance due to the less visible gate on the side of the part.
Injection
mold: Using a tunnel to fill the
part
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Dec 19, 2018
The cavity contains air, which is pushed out by the arriving melt.
Therefore, venting is necessary to allow the air to escape the cavity.
Otherwise a compression of the air occurs, which leads to a rise of the temperature (burn mark).
The venting consists of small gaps, which are situated for example at the parting line, at the sliders and at the ejector pins.
Depending on the used polymer, the height of the gap needs to be adjusted.
If the gap is too small, it prevents the air from escaping.
If the gap is too big, flash formation occurs at the part.
