n fact, the bulging is caused by the TPE material that has not been completely cooled and hardened to release gas under the action of internal pressure, which causes the expansion of TPE / TPR material adult products. Therefore, the improvement measures of this defect are as follows:
① Better cooling: The method is to reduce the mold temperature, extend the mold opening time, and reduce the drying and plasticizing temperature of the TPE material
② Reduce the filling speed, reduce the molding cycle and reduce the flow resistance
③ Improve holding pressure and extend holding time
④ Improve the structure of TPE plastic parts to avoid the situation where the plastic parts are too thick or the thickness changes too much
⑤ The structural design of plastic parts: reduce the inconsistency of the thickness, try to ensure the uniform wall thickness; avoid the sharp corner structure of the parts, and avoid the trapped air
⑥ Mold design: Add a vent groove at the place where the melt is finally filled; redesign the gate and runner system; ensure that the vent is large enough to allow the gas to have enough time and space to drain.
⑦ Process conditions: reduce the final injection speed; set a reasonable mold temperature and prolong the mold opening time; optimize the injection pressure and holding pressure; reduce the screw loosening amount to prevent the loosening of the air into the next mold, Lower the material temperature.
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