Key points of designing venting grooves in injection molds
Venting grooves are a crucial structure in plastic mold design, they allow the venting of excess gas generated inside the mold, preventing the gas from hindering the normal filling speed of molten plastic and avoiding the compression of gas to generate excessive heat that burns the product.
Key points for designing the venting system in injection molds:
1. Position. The position of the venting groove should be set on the concave side of the parting surface as much as possible for easy mold manufacturing and cleaning, and it is suitable to set the groove in the area with a larger wall thickness to allow a smoother venting effect.
2. Direction. From a safety perspective, the venting direction should not be directed at the machine operator, and the venting groove should be made into a curve to avoid injuries caused by gas.
3. Size. The width and size of the venting groove need to be designed according to the mold structure but must not allow plastic materials to enter the venting groove.
4. Gap. The flash defect is related to the venting gap. It is necessary to design a reasonable venting gap based on the properties of different plastics to effectively avoid flash defects during mass production.
