What are the factors that cause overflow in injection molds?

Author: MULAN - Plastic Molding Manufacturer

We need to know what is called flashing, in fact, flashing is also called flashing and flashing, which usually occurs at the opening and closing position of the mold. For example, the parting surface of the mold, the clearance of the insert, the hole of the ejector, etc. If the overflow cannot be eliminated in time, it will cause part of the injection mold to collapse or even be damaged.

In addition, the gap between the blades and the overflow of the ejector pin hole will cause the finished product to stick to the mold, which will affect the demoulding process. So what are the factors that lead to the overflow of the injection mold? The editor of the injection mold manufacturer below will explain in detail the factors that cause the overflow of the injection mold. The specific content is as follows: 1. Improper adjustment of the clamping device of the injection molding machine Or the improper toggle 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 can easily overflow during injection. 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 fixed ring of the injection molding machine is severely worn, the screws are too worn, the injection volume in the barrel is insufficient, and the buffer pad is too small, which may cause overflow. 4. Poor accuracy of the parting surface of the mold, deformation and warping of the movable template (such as the middle plate), foreign objects on the parting surface and prominent sliding burrs around the mold base will all cause the injection mold to overflow. 5. The mold design is unreasonable.

If the opening position of the mold cavity deviates too much, the one-way tension of the mold will be too large during the injection process, resulting in flash.