What are the factors that lead to an overflow in injection molds?

We need to know what is meant by overflow. Overflow, also known as spill and flutter, usually occurs in the open and closed positions of the mold. For example, the parting surface of the mold, the gap of the insert, the hole of the ejector, etc. If the overflow is not eliminated in time, it will lead to partial collapse or even damage to the injection mold. 

In addition, the overflow from the gap between inserts and ejector holes will cause the finished product to adhere to the mold, thus affecting the demolding process. So what are the factors that lead to the overflow of injection molds?

The following GonSon injection mold manufacturer's editor will give you a detailed explanation of the factors that lead to an overflow in injection molds, as follows.

Injection mold

1. improper adjustment of the mold closing device of the injection molding machine or improper elbow joint mechanism will cause the mold to fail to achieve the required parallelism, resulting in a tight seal on one side of the mold and a firm seal on the other side, which will easily overflow during the injection process.

2. The parallelism of the injection molding machine itself is problematic, and the uneven distribution of the tie rods will also cause the mold to fail to close tightly and cause overflow.

3. The fixing ring of the injection machine is severely worn, the screws are too worn, the injection volume in the barrel is not enough, and the cushion is too small, which may lead to overflow.

4. Poor accuracy of mold parting surface, deformation and warpage of movable template (such as a center plate), foreign objects on the parting surface, and protruding sliding burrs around mold seat can cause injection mold overflow.

5. The mold design is not reasonable. If the opening position of the mold cavity is offset too much, the one-way tension of the mold will be too large during the injection process, thus producing flying edges.