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polypropylene (PP) PP molding
Date: 2019-07-24 12:32
Views: 4556
Source: Internet
plastics raw materials processing process main/primary is 胶粒熔 melt, flow, type rear cooling formed is formed product, is add temperature rear again cooling process, is plastics from pellets to different process, below/following will different stage/phase degree processing process.
1.熔 melt
plant/unit add temperature device (Heater) let raw materials pellets 逐渐熔 understanding formed 流体状 flow, main/primary different raw materials combined temperature degree adjustment, high temperature degree make raw materials flow add fast, can increase efficiency 但不一定 can ensure yield rate, must combined balanced. good and PP遇 high hot understanding features, is production most good can let raw materials 顺利流畅 to 模头, 以避免充 material or phenomenon generate, 回流代 table/sheet raw materials flow relatively speed rate fast, most rear formed flow efficiency add large and other 于MFR improve/increase, is processing can utilizing methods 之一, 但却也造 formed MFR distribution non can can unstable property add large, defect rate can can add large. PP formed product is application 关系都不 is dimensions density very high product, therefore effect/influence also large.
2. screw
PP processing large 部份都 is screw belt/tape flow property, therefore screw design effect/influence non large, large small effect/influence amount, pressure shrink ratio large small effect/influence pressure value effect/influence amount and formed product 效果, this 也包括 multiple material (masterbatch, additives and agent) mixing/compounding 效果. raw materials flow main/primary add temperature device, raw materials abrasion scratch generate abrasion scratch hot can make flow property add fast, therefore screw pressure shrink ratio small belt/tape flow small, speed must add large formed abrasion scratch hot can relatively pressure shrink ratio large screw more. therefore plastics processing 无师傅, use understanding machine property can is 师傅. raw materials hot is add temperature device already, must scratch hot and time 都并算 in inner. therefore this is issues, experience has production issues solution and efficiency. screw if need mixing/compounding especially good, has design 二段式 different screw or di screw separation 设各段 different screw 以达各式 mixing/compounding 效果.
3. mold or 模头
plastics heavy new type is mold or 模头, injection shot molding formed product is 立体, mold comparison complex more need shrinkage rate issues, its it is 平面, strip/profile 状, 针状连续式 product 模头, is 特殊形状则归 is type, need attention/notes cooling type issues. plastics machine design large 部份皆像 injection 针筒, screw belt/tape 动 挤 pressure amount in small small export formed large pressure, improve/increase production efficiency. 当模头 design is 平面时 how to let raw materials distribution 整 面 upper, 衣架模头 design separation important, pressure machine increase 鱼鳃式帮浦 stability raw materials supply amount.
4. cooling
injection shot mold remove gate raw materials outer, has cooling water cooling raw materials design. pressure molding 则靠滚轮 inner cooling water 道 达 formed cooling 效果, remove outer has 风刀, cooling water 直接淋 in bag upper, and in gas and other cooling methods.
5.延伸
formed product again processing 延伸会 reinforcement 效果, 例如打包 belt/tape front rear belt/tape speed rate 不一即造 formed 延伸效果, formed product toward 延伸部份 resistant force add strong/high easy 撕断, toward 就极容 easy 撕开. molecular weight distribution effect/influence high speed production 时 延伸效果, has pressure formed product fiber has and other 延伸, true and pressure molding can is 延伸 另一 types 形式.
6. shrinkage
任何 raw materials has shrinkage rate issues, shrinkage causes hot cold shrink and crystallization formed generate internal stress formed. generally hot cold shrink relatively easy 克服, can in processing upper long cooling time, holding pressure can good, crystallization raw materials relatively non crystallization has more large shrinkage 差异, 以PP而言约 in per mille 之十六, 但ABS仅 per mille left right, very large this need in mold upper 克服, or 者往往添 add decrease/reduce shrinkage rate additives 克服, pressure sheet/plate 也常添 add LDPE improvement shrink issues.
1.熔 melt
plant/unit add temperature device (Heater) let raw materials pellets 逐渐熔 understanding formed 流体状 flow, main/primary different raw materials combined temperature degree adjustment, high temperature degree make raw materials flow add fast, can increase efficiency 但不一定 can ensure yield rate, must combined balanced. good and PP遇 high hot understanding features, is production most good can let raw materials 顺利流畅 to 模头, 以避免充 material or phenomenon generate, 回流代 table/sheet raw materials flow relatively speed rate fast, most rear formed flow efficiency add large and other 于MFR improve/increase, is processing can utilizing methods 之一, 但却也造 formed MFR distribution non can can unstable property add large, defect rate can can add large. PP formed product is application 关系都不 is dimensions density very high product, therefore effect/influence also large.
2. screw
PP processing large 部份都 is screw belt/tape flow property, therefore screw design effect/influence non large, large small effect/influence amount, pressure shrink ratio large small effect/influence pressure value effect/influence amount and formed product 效果, this 也包括 multiple material (masterbatch, additives and agent) mixing/compounding 效果. raw materials flow main/primary add temperature device, raw materials abrasion scratch generate abrasion scratch hot can make flow property add fast, therefore screw pressure shrink ratio small belt/tape flow small, speed must add large formed abrasion scratch hot can relatively pressure shrink ratio large screw more. therefore plastics processing 无师傅, use understanding machine property can is 师傅. raw materials hot is add temperature device already, must scratch hot and time 都并算 in inner. therefore this is issues, experience has production issues solution and efficiency. screw if need mixing/compounding especially good, has design 二段式 different screw or di screw separation 设各段 different screw 以达各式 mixing/compounding 效果.
3. mold or 模头
plastics heavy new type is mold or 模头, injection shot molding formed product is 立体, mold comparison complex more need shrinkage rate issues, its it is 平面, strip/profile 状, 针状连续式 product 模头, is 特殊形状则归 is type, need attention/notes cooling type issues. plastics machine design large 部份皆像 injection 针筒, screw belt/tape 动 挤 pressure amount in small small export formed large pressure, improve/increase production efficiency. 当模头 design is 平面时 how to let raw materials distribution 整 面 upper, 衣架模头 design separation important, pressure machine increase 鱼鳃式帮浦 stability raw materials supply amount.
4. cooling
injection shot mold remove gate raw materials outer, has cooling water cooling raw materials design. pressure molding 则靠滚轮 inner cooling water 道 达 formed cooling 效果, remove outer has 风刀, cooling water 直接淋 in bag upper, and in gas and other cooling methods.
5.延伸
formed product again processing 延伸会 reinforcement 效果, 例如打包 belt/tape front rear belt/tape speed rate 不一即造 formed 延伸效果, formed product toward 延伸部份 resistant force add strong/high easy 撕断, toward 就极容 easy 撕开. molecular weight distribution effect/influence high speed production 时 延伸效果, has pressure formed product fiber has and other 延伸, true and pressure molding can is 延伸 另一 types 形式.
6. shrinkage
任何 raw materials has shrinkage rate issues, shrinkage causes hot cold shrink and crystallization formed generate internal stress formed. generally hot cold shrink relatively easy 克服, can in processing upper long cooling time, holding pressure can good, crystallization raw materials relatively non crystallization has more large shrinkage 差异, 以PP而言约 in per mille 之十六, 但ABS仅 per mille left right, very large this need in mold upper 克服, or 者往往添 add decrease/reduce shrinkage rate additives 克服, pressure sheet/plate 也常添 add LDPE improvement shrink issues.
