Causes and solutions for bubbles that are prone to injection molding products such as TPR/TPE
What are the reasons for the appearance of many different villages and shape bubbles on the surface and inside of injection molded products such as TPR/TPE? How should we solve it?
(1) Wrapped in air when melting
The pressure is too small or the time is too short, and the air entrapped in the injection process is not sufficiently discharged, causing bubbles to form in the product. Solutions for bubble-forming products such as TPR/TPE are prone to bubble formation: if the glue is entrapped in the air, the back pressure, injection pressure, holding pressure, and dwell time are appropriately increased.
(2) The rubber contains moisture
TPR/TPE injection molding products are prone to bubble solution: properly adjust the product formula, add stabilizer; thoroughly dry the material to remove low molecular substances
(3) The mold design is unreasonable
If the gate is not in the correct position or the gate section is too small, the main channel and the runner are long and narrow, etc., which may cause bubbles to produce bubbles that are prone to bubbles in injection molded products such as TPR/TPE: rational design of the mold structure (including the runner) Structure, gate structure, etc.)
(4) Process conditions
The molding temperature is too high; the molding cycle is too long. Solutions such as TPR/TPE are prone to bubbles. Appropriately reduce the molding temperature; shorten the molding cycle.