Shanghai Daoqin Plastics Co., Ltd.

         injection molding is types industrial product production type methods. product usually use injection molding and plastics injection molding. injection molding also can separation injection molding pressure method and pressure method.

         injection molding machine (简称 injection machine or injection molding machine) is will thermoplastic property plastics or hot solid property material utilizing plastics molding mold made formed various plastics products main/primary molding equipment, injection molding is through injection molding machine and mold achieve.

         that 么, this 里认识 lower effect/influence injection molding parts strong/high degree injection molding process:

        1) improve/increase injection pressure can improves PP injection molding parts tensile strength

        PP material versus for other hard material elastic property relatively large, therefore injection molding parts density pressure increase increase this features versus comparison relatively obvious. plastics parts density increase 时, it resistant strong/high degree 自然会跟 reinforcement, 反之则会 decrease small.

        不, density increase to PP本身 can to most large value 时, again rise high pressure, tensile strength 也不会继续 reinforcement, 反而会 increase injection molding parts internal stress,令 injection molding parts 变脆, therefore can 而止.

         other material has similar 情形, obvious degree has different.

        2) mold hot injection molding can improvement parts and nylon parts strong/high degree

         nylon and POM material, belongs to crystallization type plastics. mold use hot machine hot injection molding, can make injection molding parts cooling speed degree slow, plastics crystallization degree to improve/increase. meanwhile due to cooling speed degree slow, injection molding parts internal stress therefore decrease small. therefore, use hot machine hot injection molding nylon and POM parts impact resistant property can and tensile strength versus to improve/increase.

         need attention/notes is, use hot machine hot injection molding nylon and POM parts versus for water injection molding injection molding parts dimensions has different, nylon parts also large 一.

        3) speed degree fast make 180℃ injection molding 也会生胶

         usually lower, pvc90 degree material use 180℃ injection molding, temperature degree already 经足够, generally 不会出现生胶 issues. 但常常 is due to 未引起操 as attention/notes 原故, or is add fast production has add fast speed degree, make screw rear speed degree versus fast, ratio use 两三秒 time, screw to most large amount separation above 位置, PVC material by add hot and time heavy 不足, formed temperature degree and mixed combined 不均 生胶 issues, make injection molding parts strong/high degree and tough property 都会变 versus 当 差.

         therefore, in injection molding PVC material 时候, need attention/notes need will 熔胶转 speed to 100转/ separation above. if need versus fast, need will material temperature rise high 5至10℃, or 者适当 increase back pressure combined, meanwhile also need attention/notes 经常检查 has has 发生生胶 issues, 否则极 has can can formed heavy large loss 失.

         about/regarding this issues, generally 人都不会太 in 意, therefore this especially 提出 提醒 production must attention/notes, and need 记 做 good 检查功夫.

         versus need attention/notes is, if speed degree slow, is 180 degree injection molding PVC90 degree material, 也会造 formed issues, especially is transparent PVC, injection molding parts upper has many and gas marks generate.