Shanghai Daoqin Plastics Co., Ltd.

         bubbles 常常发生 in plastics products most rear 接缝处 or products relatively thick separation. products in type inner is surface cooling, outer surface already cooling, in separation still hot 状态. in separation cooling need shrinkage, plastics surface already cooling, therefore can internal shrinkage formed bubbles. has many thick made parts in 出模时 also has bubbles, is 经 数十秒钟 rear, in in separation has bubbles 出现.

         bubbles has types 情况, phenomenon different, causes different, separation lower:

        (1) relatively thick products, surface 发胖而鼓起, 锯开断面处 has bubbles, its causes can can is:

        1) injection speed degree fast, 包住空 gas, method troubleshooting, formed bubbles.

        2) add material amount more or less, injection pressure high, generate this type of phenomenon, 如适当 adjustment add material amount improvement this type of phenomenon.

        3) cooling time short (especially is thick products), solutions can in machine outer use cold water and cold pressure 模进行 cooling.

        4) products in has separation understanding phenomenon, this is due to temperature degree high formed. if 情况不严 heavy, can reduce temperature degree, if machine separation understanding, must 拆车清理.

        5) mold gate small and gas defect, generate this type of phenomenon.

        (2) products has 空洞, has phenomenon. products molding 时, injection pressure need low, injection speed degree need slow, 否则, gas in high pressure lower 经 摩 scratch by in products in, make products in has 黑 空嗣. therefore reduce injection pressure and injection speed degree, phenomenon 就会消失. also can 检查一 lower add material amount is more, decrease/reduce add material amount for improvement this type of phenomenon is has 利.

        (3) plastics products thick degree meanwhile, in products relatively thick separation has small bubbles, or in products thick has black large in 里面. meanwhile molding several different products 时, must attention/notes gate large small need and products weight versus 当, 否则, thick products easy generate bubbles. meanwhile also need attention/notes mold gas, 经常留 in front upper products make gas comparison difficult, easy generate upper phenomenon. can through mold or increase holding pressure time and cooling time, 莱妊补 thick pressure 不足, from improvement this type of phenomenon. more main/primary is in design products 时, amount products has thick separation.