Shanghai Daoqin Plastics Co., Ltd.

几十 year large liquid bottle will by new type PP plastics large liquid bottle 取代. PP plastics large liquid bottle tool 备玻璃 bottle can ratio advantages: is resistant impact, easy loss; is weight relatively light, can large degree reduce cost; is one-time molding, generate 二次污染; is 无毒, for 人体不会 generate function; -五 is manufacturing cost low, mono bottle 计算, versus 当于玻璃 bottle cost 40％ left right. in addition, excellent one-time property plastics bottle 省略 清洗消毒工序, meanwhile 也节约 related can 源, can versus 当一部 separation production process. PP plastics large liquid bottle bottle 身(preform), inner cover/cap, outer cover/cap, ring and inner 塞五部 separation formed 如（图1）, production injection is 主, material 以BOPP is 主, upper products in production process in generate defect main/primary is products in bubbles, true 空泡, black spots 黑纹, this defect generate causes and solution methods analysis lower. bottle 身(preform), large liquid bottle production is use injection molding parts machine injection molding parts preform, is 我们常说 PP preform, use material is BOPP. PP preform in injection process in if process defect, that it 就会直接反映 to bottle upper, therefore has bottle defect, need in preform upper issues. PP preform and preform bottle defect main/primary is bubbles issues, bubbles in preform injection already generate 如图2. this preform formed bottle rear 如图3. in preform in products bubbles has types, generate causes is 不一样, generally according to bubbles 出现 位置 进行判断. 如图2 this bubbles is is defect generate, in process upper can through increase back pressure, reduce screw speed and improve/increase temperature degree and other methods solution. production efficiency reduce, this is can 忍受, therefore injection molding parts machine production injection molding parts processing through screw structure 进行处理. this 样就既 can solution bubbles issues, also reduce production efficiency, also can improve/increase production efficiency. this is gas generate in products in 部 情况; if bubbles generate in bottle 口处, 如图4, generally has 白斑, or 烧焦点, this is is gas defect standards phenomenon. is is gas defect generate, can using/adopting more grade injection, most rear use slow speed injection, reduce clamping force, improve/increase injection molding parts mold gas and other. 如图5 in this upper 也会出现” bubbles ”, its this 方 “ bubbles ” in has “汽”, is standards true 空泡, is due to injection holding pressure time 不够, 出现 倒流 phenomenon sink marks formed, therefore increase holding pressure time and holding pressure pressure is necessary. another in bottle formed rear, 偶尔会出现如图6 and 图7 defect, 图6 横 toward is bottle rear 出现, preform 号不定, is in bottle inner 壁, and bottle add temperature has 关, is 说, in bottle preform external temperature degree to plastics high elastic 态. preform internal temperature degree has to, therefore in bottle preform inner by hard property 扯拽, from generate toward 褶皱, and bottle, surface comparison coarse 糙, has and other defect. therefore 图6 defect and preform 本身没 has 关系, is bottle process issues. 图7 defect and preform injection molding parts process and injection molding parts mold has 关, 图7纵 toward strip/profile 纹出现 in solid preform upper, research toward strip/profile and preform in demolding 时 脱伤 has 关, preform in demolding by mold cavity and demolding direction same strip/profile 纹, this strip/profile in bottle by large 而出现 upper defect. therefore comparison process 人员发现, if has issues preform type 芯抛一 lower light, issues can solution, 但 一段 time also 会出现, this 说明, this is issues key/critical. its preform by injection molding parts mold type 芯刮伤(脱伤) and product force large has 关, force large and injection pressure and holding pressure large has 关, if is injection pressure and holding pressure large, that is what its it 腔不出现 this type of issues 呢? rear research 发现, this preform force large and it gate has 关. 经 测 amount, issues preform type gate large its it type 腔． this is issues in. gate large, pressure good, preform force large, therefore 会出现 demolding 刮伤. generally PP preform gate is 2mm(也 has 3mm). if its certain preform gate ultra- 2.1mm．就会出现 upper issues. preform is formed bottle thick degree main/primary causes, preform main/primary causes is injection pressure and holding pressure pressure large, formed injection molding parts mold type 芯偏心; type 芯本身倾斜 or type strong/high degree good, 都会造 formed upper issues. outer cover/cap, use material PP+ elastomer. due to elastomer in ． therefore outer cover/cap main/primary defect is black spots and true 空泡, 如图8. this is 一 典 type material separation understanding black spots, due to PP relatively elastomer resistant temperature property good ． therefore elastomer easy separation understanding generate black spots. in process upper can through reduce material temperature degree, back pressure and speed solution, adjustment comparison difficult but also also has 一 副 function. from injection molding parts machine screw structure upper solution comparison good, large machine PP specialized screw can has solution this issues. in outer cover/cap thick 边缘处容 easy true 空泡, 如图8 示, main/primary is sink marks formed, through holding pressure and other methods 进行处理就 can solution issues. inner cover/cap, use material PP+ elastomer. inner cover/cap remove outer cover/cap 一样会出现 black spots outer, its most easy defect is bubbles, 如图9示, especially in inner cover/cap 边缘容 easy bubbles. inner cover/cap due to is very thick, therefore true 空泡 几 rate is very large, generally is bubbles. causes is gas defect. due to is material flow most rear 部, but also use injection molding parts machine comparison large, therefore gas defect very positive 常, generally can through reduce speed and clamping force methods solution.