Shanghai Daoqin Plastics Co., Ltd.

二十世纪九十 year 代初, China 农药界兴起 以塑代玻 hot 潮. short short year to, plastics bottle its can substitute/replace advantages, 占据 农药 packaging 主导 位. can 说, remove low 档农药 product or small injection molding parts processing still in use bottle outer, already very less again use it packaging 农药. 　　　　 however, plastics bottle remove light, 美观, easy processing, easy loss, comprehensive cost has competition force this advantages outer, in easy deformation this 么一 令人头痛 不足. 本文拟就此不足之 formed and how to add solution as in-depth discussion, to 一 抛砖引玉, 集思广益之 function. plastics packaging bottle deformation formed 　　　　农药 plastics packaging bottle deformation more 发生于 packaging 乳油农药, its deformation can its formed separation is type: 　　　　一, hot 灌装导致 deformation: 　　　　 in sales or in 一 特殊 情况 lower, plastics bottle temperature degree ratio ring temperature degree high very more. generally 农药灌装 rear 会立即封口 cover/cap 紧. is 避免农药灌装时溅出 or bottle 口, generally bottle inner need ratio 需灌入 liquid 体之容积 more less 10% above. is 说, hot rear bottle inner 10% above 存留空 gas temperature degree and is 一样. 当一段 time rear, and internal gas drop ring temperature degree 时, bottle inner 就会因 hot cold shrink and liquid upper liquid 化而造 formed negative pressure. negative pressure ultra- bottle strong/high degree 时, 就会导致 plastics bottle inner 陷, deformation. 　　　　二, solvent, heavy deformation. 　　　　此 deformation chemical material 质 极 property versus versus solvent principle. plastics packaging bottle 材质 极 property and its packaging 乳油农药之 has machine solvent agent property versus 近时, versus between 就会出现互 solvent. time 推移, solvent development formed 渗透. has machine solvent agent from packaging bottle bottle material separation 子间隙 in 渗透逸出. bottle 100 milli rise 装 农药 in dry time rear formed 90 milli rise, 80 milli rise, more less. therefore 时农药 bottle cover/cap is 密封, this type of 渗漏而导致 失 heavy generate negative pressure, most make bottle deformation. 　　　　 generally, high density polyethylene (PE) bottle （PE） use packaging 脂族, or ester type and ketone type, or solvent agent 时; polyester bottle （PET） packaging 二甲基甲酰 amine （DMF）时; more 层共挤 bottle inner is polyethylene (PE) alcohol （EVOH） packaging or ester type and ketone type solvent agent 时, 均会发生 this category of phenomenon. 　　三, oxidation generate negative pressure deformation. 　　　　农药 formed separation non complex, its formed separation in certain solvent agent, or emulsification agent, or raw materials in 不知名 杂质常常会 and bottle inner 存留 空 gas in oxygen gas oxidation reaction, 进而导致 negative pressure generate deformation. 　　　　 for phenomenon, 我们曾做 more fast speed aging test add 以证实. 如我们 will 1.8%阿维菌素 testing 农药放入 plastics bottle in, cover/cap cover/cap in cover/cap upper small and has water U形 tube/pipe versus 连接. rear, will bottle and and its versus U形 tube/pipe 放入50°±2℃ 烘箱 in hot 储5天, meanwhile 每天记录U形 tube/pipe liquid high degree 变化情况. 　　　　 in rise temperature and rear time inner, 因农药 bottle inner liquid and gas hot 膨胀, bottle inner generate positive pressure. U形 tube/pipe and bottle inner versus liquid low and outer large gas versus liquid 面. however time 推移, liquid high 差逐渐变 small, 30 small 时时齐平. rear, and large gas versus liquid 面开始 low and bottle inner versus liquid 面, this 显示出 bottle inner already 开始出现 negative pressure. 当满五天取出 testing 农药并回复至 room temperature 时, will 测 之 liquid 面差换算 formed negative pressure value is -12.9千帕（Kpa）, its 时, bottle inner oxygen amount 亦由原先 约20%~21% drop 至5%~7%. solution deformation types methods 　　　　鉴于 plastics bottle deformation is 一 普遍 phenomenon, plastics bottle production injection molding parts processing has necessary and injection molding parts processing 家一起携手 combined as, discussion and force solution this difficult 题. 　　　　一, 克服因 hot 灌装导致 deformation methods. 　　 very simple very 直接, can can normal temperature 灌装. is to 此目, injection molding parts processing in method reduce reaction temperature degree 时, 应采取 or long ring pipeline or increase cooling plant/unit add 以克服. this methods method achieve, in 农药灌装入 plastics bottle inner rear, its cooling normal temperature again 行封口 add cover/cap. 　　　　二, solvent, heavy deformation solution methods. 　　 main/primary methods is according to 乳油农药 in different solvent agent, selection different has for property retardant 隔效果材质 plastics bottle, in selection front versus property experiment/testing add 以确认. 　　　　 generally 而言, liquid 体农药之 water agent, agent deformation relatively less, 普通材质 plastics bottle already full can 胜任. 　　　　乳油农药因 its solvent agent more tool property, in most new 颁布并 already in 2001 year 3 month 1 day 起实施 《农药乳油 packaging 》 in especially 明确应 use bottle, high density polyethylene (PE) fluorine bottle and and other its it bottle （ bag ） and other packaging. 　　　　应该讲, polyester bottle （PET） for 一 乳油农药 use solvent agent has good retardant 隔效果, 但PET因 its easy absorption ring in water separation, 进而导致农药 water separation ultra- 标, separation understanding 乃至失效 this 一先天不足, in upper by made use. 　　　　就 retardant bottle 效果而言, bottle, aluminum bottle, more 层共挤 bottle （ inner is nylon or polyethylene (PE) alcohol ） and fluorine bottle has good performance. versus for 而言, bottle its easy loss 而导致污染 致命 low application day decrease/reduce. aluminum bottle cost relatively high. property ratio 而言, more bottle and fluorine bottle; 就效果而言, 100 milli rise and below/following more bottle excellent fluorine bottle, specifications large, fluorine bottle competition force strong/high. 　　　　 due to more bottle inner selection nylon also is polyethylene (PE) alcohol need 取决于农药 in solvent agent types type, fluorine bottle inner is poly ethylene （ plastics 王） and other fluorine plastics 层, formed separation non complex, in selection this types retardant bottle 时, must product versus property experiment/testing, 以确认 retardant 隔效果. 　　三, oxidation generate negative pressure deformation solution methods. 　　　　就农药 injection molding parts processing 家而言, can more solvent agent or emulsification agent, control raw materials content improve/increase pure degree reduce oxidation can can property. meanwhile, can 仿效国际 company, in 农药灌装时充 nitrogen, reduce 存留空 gas oxygen content, to stability formed separation and oxidation reaction di heavy 目. 　　　　就 plastics bottle production injection molding parts processing 商而言, can in equipment and injection molding parts mold can lower, increase bottle heavy improve/increase bottle resistant deformation strong/high degree. in heavy increase already 至极限而 still solution issues 时, 应考虑 development belt/tape add strong/high new bottle solution issues, types methods need development new injection molding parts mold and 花费一定 time, production must has versus 当 投入 and 承担不 small 风险（当 bottle is use 户接受时）. 　　　　实际操 as in, 经常会碰 to types bottle deformation causes meanwhile in, or very difficult separation is what causes deformation. 而发生 deformation rear 势必造 formed 包括经济 and injection molding parts processing 厂形象两 方面 loss 失.