What Is The Cause Of Bubbles in Mold Injection Products
May 05, 2022
What is the cause of bubbles in mold injection products?
Why do bubbles appear in the product during the injection molding process? Many friends will encounter such problems in the production process.
1. Defects in mold design
Such as: poor gate position, too small gate, asymmetric gate arrangement of multi-gate parts, small runner, unreasonable mold cooling system, making the mold temperature difference too large, etc. continuous, blocking the passage of air.
2. The parting surface of the mold lacks the necessary exhaust channels or the exhaust channels are insufficient, blocked, and in poor position, and there are no processing gaps such as inserts and thimbles for exhausting, so that the air in the cavity cannot be exhausted when the plastic enters. leave at the same time.
3. The surface roughness of the mold is poor and the frictional resistance is large, causing local hot spots and decomposing the passing plastic.
In addition to the reasons for the mold, there will also be equipment, technology, raw materials and other reasons;
