Shanghai Daoqin Plastics Co., Ltd.

PET plastics raw materials blow molding bottle technology terephthalic acid ester (PET) blow molding bottle production type 坯 预 molding different can separation is injection tensile blow molding (简称注拉吹) and extrusion tensile blow molding (简称挤拉吹). in this types molding methods in, due to 注拉吹 process easy control, production efficiency high, waste product less relatively is general purpose.

PET blow molding bottle can separation is type , type is has pressure bottle, 如充装 carbon acid material bottle; type is pressure bottle, 如充装 water, 茶, and other bottle. material bottle is mixed poly 萘二甲 acid ester (PEN) modified PET bottle or PET and thermoplastic property poly ester composite/compounding bottle, in classification upper hot bottle, can heat resistant 80℃ above; water bottle cold bottle, for heat resistant property requirements. in molding process upper hot bottle and cold bottle versus 似. main/primary cold bottle in has pressure material bottle molding process.
1 equipment
随 科技 不断进步 and production 规模化, PET吹 bottle machine 自动化程 degree 越 越 high, production efficiency 也越 越 high. equipment production can force improve/increase, from front small production bottle development to in small production bottle. as 也由 手动按钮式 development is in full electrical control, large large reduce process as upper difficult degree, increase process stability property.
currently, 注拉吹 equipment production main/primary has France SIDEL company, Germany KRONES company and other. although production different, its equipment principle versus 似, generally 均包括供坯 system, add hot system, bottle system, control system and machine large separation.
2 blow molding process PET bottle blow molding process process/workflow
effect/influence PET bottle blow molding process important factors has preform, add hot, 预吹, mold and ring and other.
2.1 preform
made blow molding bottle 时, will PET切 sheet/slice injection molding is preform, it requirements recycling material ratio/proportion can high (5％ below/following), recycling 次数不 can ultra- 两次, but also molecular weight and viscosity can low (molecular weight 31000-50000, features viscosity 0.78-0.85cm3／g). injection molding preform 需存放48h above can use. add hot rear use preform, must again 存放48h above can heavy new add hot use. preform time can ultra- 六 month.
preform excellent poor very large degree upper 取决于PET材 material excellent poor, selection easy 吹胀, easy type material, made combined preform molding process. table/sheet 明, viscosity PET材 material molding preform, Imported raw materials need ratio Domestic material easy blow molding; 而同一 batch preform, production day different, blow molding process can can has relatively large 差别. preform excellent poor blow molding process difficult easy, for preform requirements is pure 洁, transparent, 无杂质, color, long degree and 周围晕斑 combined 适.
2.2 add hot
preform add hot add hot 烘箱 完 formed, its temperature degree 由人工 setting, adjustment. in 由远红 outer tube/pipe 发出远红 outer for preform add hot, 由烘箱底部风 machine hot ring, make inner temperature degree uniform. preform in in toward front meanwhile 自转, make preform hot uniform. tube/pipe in in upper lower generally 呈"区"字形, more, in less. hot amount tube/pipe 开启数 amount, overall temperature degree setting, 烘箱功 rate and add hot ratio control. tube/pipe need combined bottle adjustment.
need make more good function, its high degree, cooling sheet/plate and other adjustment very important, adjustment 不当, blow molding easy 出现胀 bottle 口(bottle large), hard 头颈(颈部 material 拉不开) and other defect.
2.3预吹
预吹 is 二步吹 bottle method in very important steps, it is blow molding process in in tensile decline meanwhile 开始预吹 gas, make preform tool 形状. this 一工序 in 预吹位置, pressure and gas amount is important process factors. bottle excellent poor blow molding process difficult easy and bottle property can excellent poor. positive 常 预吹 bottle is 纺锤形, 异常 则 has 亚铃状, 手柄状 and other, 如图2 示. formed 异常形状 causes has local add hot 不当, pressure or gas amount and other, 而预吹 bottle large small 则取决于预吹 pressure and 预吹位置. in production in need 维持整台 equipment has bottle large small and 形状一致, has 差异则 need specific causes, can according to bottle adjustment add hot or process. pressure large small bottle specifications, equipment can force different 而异, generally amount large, pressure need small; equipment production can force high, pressure high.
即 make using/adopting equipment production specifications bottle 子, due to PET材 material property can 差异, its 需预吹 pressure 也不尽 same. glass fiber reinforced PET材 material, relatively small pressure can make bottle 子底部 large separation positive orientation; use material or molding process 不适当 preform, 注点附近 has a large amount of force in easy 消退, if blow molding, in 注点处吹破 or in force testing in from 注点处爆裂, 渗漏. according to orientation conditions, can 如 示 灯 tube/pipe 移出2-3支至注点 upper 方开启, to 予注点处充 separation add hot, provide hot amount, make its speed orientation. for/regarding already add hot use preform or time ultra- 标 preform, due to temperature and other 差效应, molding process versus 似, and positive preform versus ratio, its requirements hot amount need less, pressure can reduce.
2.4辅 machine and mold
辅 machine main/primary 指维持 mold temperature equipment. mold temperature for product stability property has important function. generally bottle temperature degree high, bottle temperature degree low. for cold bottle 说, due to its cooling 效果决定 separation toward degree, will temperature degree control in 5-8℃ is 佳; hot bottle temperature degree need high more. mold is effect/influence PET bottle blow molding process important factors, mold excellent poor decrease light or add large process adjustment difficult degree, add strong/high 筋, 渡区 弧 degree and dispersion hot and other for process adjustment has effect/influence.
2.5 ring 境
production ring good bad for process adjustment has relatively large effect/influence, conditions can process stability and product stability. PET bottle blow molding generally in room temperature, low wet lower is 佳.
3 its it requirements
has pressure bottle meanwhile meet/satisfy force testing and resistant pressure testing requirements. force testing is is anti 止PET plastics raw materials bottle 灌装饮 material bottle and lubricant (alkali property)接触 process in generate separation degradation 而发生 cracking, and other inner in quality control; resistant pressure testing is anti bottle inner 充入一定 pressure gas rear generate 爆裂而进行 quality control. is meet/satisfy this types need, in thick degree need control in scope/range inner, generally is in thin, force testing relatively good, resistant pressure relatively 差; in thick, resistant pressure testing relatively good, force testing relatively 差. 当然, force testing also and in 心点周围 渡区域 material has very large 关系, this need according to experience adjustment.
4结语
PET bottle blow molding process adjustment, is for versus 应 材 material 进行, if material 不佳, for process requirements very 苛刻, 甚至于 difficult blow molding combined bottle 子