Shanghai Daoqin Plastics Co., Ltd.

thermoplastic property plastics add hot soft flow, cooling hard molding product, this type of process is can 逆, can 反复进行. polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polyoxymethylene (POM), polycarbonate (PC), polyamide (PA), acrylic type plastics, its it polyolefin and its copolymer, polysulfone (PSU), polyphenylene oxide (PPO), chlorine polyether and other is thermoplastic property plastics. thermoplastic property plastics in resin separation 子链都 is type or belt/tape structure, separation between chemical generate, add hot soft flow, cooling hard process is material 理变化.

　　 resin is polymerization reaction made. this type of resin generally is has saturated and 键, main/primary is di mono 体,借 di 键打开生 formed, reaction process in low separation material 释出. polyolefin, poly 卤代烯烃, polystyrene (PS), polyoxymethylene (POM), acrylic type plastics belongs to polymerization type plastics. polymerization type plastics is thermoplastic property plastics. b) polycondensation type plastics resin is polycondensation reaction made. this type of resin generally is has certain types can 团(generally most less has 两 官 can 团) mono 体,借官 can between

　　 reaction make mono 体连接起 而形 formed. 1.3.3 按 plastics in resin large separation has 序状态 separation: a) 无定形 plastics resin large separation 子 排列 is 无序. this type of plastics, due to resin separation structure features, or hot force causes, or molding process process conditions scope/range made, separation 子链不会 generate has 序 整齐堆砌形 formed crystallization structure,而呈现 random 则 随 machine 排列. in pure resin 状态, this type of plastics is transparent. b) crystallization type plastics resin large separation 子排列呈现出 has versus. from melt cooling is products process in, resin separation can has 序 紧密堆砌 generate crystallization structure. generally crystallization type plastics,实际 upper is semi crystallization,不像 low separation 子晶体(例如NaCl) that can generate 100% crystallization degree. resin large separation 子链排列呈现出无定形 versus and crystallization versus 共存 状态. molding conditions for crystallization degree and structure has obvious effect/influence, from for products property can has obvious effect/influence. crystallization structure in thermoplastic property plastics in.

　　 thermoplastic property plastics injection molding molding is will plastics material melt, rear will its film 腔. melt plastics 一旦进入 mold in, it cold mold cavity molding formed 一定形状. 形状往往就 is most rear formed product, in or as is most formed product use front again need its it processing. many fine 部, 诸如凸起部. 肋, 螺纹, can in injection 模塑一步操 as in molding 出. injection machine has basic parts: used for melt and plastics mold injection plant/unit and clamping plant/unit. clamping plant/unit function in 于: (1) make mold in 承受住 injection pressure lower combined;(2) will products 取出. injection plant/unit in plastics mold front will its melt, rear control pressure and speed degree will melt mold. currently using/adopting injection plant/unit has types design: screw 式预塑化 device or di grade plant/unit, and 往复式 screw. screw 式预塑化 device utilizing 预塑化 screw (第一 grade) again will melt plastics 送人注 material 杆(第二 grade). screw 预塑化 device advantages is melt material quality 恒定, high pressure and high speed, and injection amount control (utilizing active 塞冲程两端 machine 械止推 plant/unit). this long positive is transparent, thin products and high production speed rate need. its disadvantages non-uniform time (导致材 material degradation), relatively high equipment use and repair use. most commonly used 往复式 screw injection plant/unit 不需柱塞即 will plastics melt injection. will material in powder or plastics melt, through screw to screw front 端止逆间处, plastics 流体流经 screw front 端并堆积于 screw front 方. screw front melt plastics will screw toward injection plant/unit rear 部, screw 转动, melt material and toward rear 部 移动一直持续 to formed injection amount. in lower equipment as cycle in, screw 末梢止逆问关闭, anti material material screw 返回. screw and material screw function has material 柱塞, will plastics pressure mold. 往复式 screw advantages decrease/reduce plastics time, screw and screw 梢. this advantages in processing hot property material and using/adopting belt/tape color raw materials or resin product types more 时, screw and machine need 清理时, is key/critical in. currently application clamping plant/unit design 包括: 肘杆式 clamping plant/unit, liquid pressure clamping plant/unit and liquid pressure machine clamping plant/unit. 肘杆式 clamping plant/unit its design in manufacturing cost low, suitable for small equipment. its features 包括闭锁 as high machine 械效益, inner 设锁模 decrease slow plant/unit, mold loss bad slow and fast speed clamping as.