Why Are Inserts Exposed During Rotational Molding Of Products?
1. Analysis of causes
Exposed inserts can sometimes be interpreted as poor resin coating, but sometimes this is not the case.
Due to continued cooling and shrinkage after the product is demoulded, the outer surface of the nut insert on the rotomolded product will be higher than the surface of the product, affecting the appearance or use.
When the insert is too close to the side of the product or the distance between the fixed end face of the insert and the mold surface is unreasonably designed,
When they interfere with each other during the rotational molding process, the root of the insert cannot be effectively filled with powder.
A phenomenon similar to the mold filling dissatisfaction during injection molding may also easily cause the insert to be exposed.
2. Solution
Before molding, add a gasket of appropriate thickness and size between the mold and the insert.
It can not only make up for the defects caused by the shrinkage of the product after molding, but also does not affect the appearance of the product.
The insert structural design must be done well. The distance between the fixed end face of the insert and the inner wall of the mold must be appropriate or flush with the inner surface of the mold.
This prevents phenomena such as dissatisfaction with mold filling during injection molding.
The cause of one or several defects in a product is not isolated.
It is often related to a variety of factors, and requires craftsmen to conduct a comprehensive analysis from all aspects of the process route based on the defects that occur.
Consider solutions from the main causes first, and then combine solutions with other non-main causes.
If we solve it as soon as possible, we will avoid detours and produce products with better quality through rotational molding.