Shanghai Daoqin Plastics Co., Ltd.

for/regarding has modified product types, its 燃烧特征 already 经改变, must in in 反复验证确定.

连粒 is series pellets versus 连 情形, in certain lower, pellets between through film for or 者以切 toward methods in 一起. in processing process in, several process issues can can or 共同导致此 types phenomenon 发生.

processing water hot is formed 连粒 一 causes, in 此情况 lower, reduce water temperature to pellets surface 足够 淬 cold.

water speed degree low is 引起连粒 一 causes, it 会导致 pellets pellet cutting speed degree decrease slow, 进而出现 pellets poly.

if 模头 孔眼距离 近, in processing process in export will formed pellets 触碰, its solution methods is using/adopting large 间距, less replace has 模头.

谓拖尾, is pellets has 突出, 切割边缘就像曲棍球杆 形状, it 看起 像一 位于切口底部 污染 material or 者撕扯 material.

its generate causes is, plant/unit in 此处没 can dry 脆利落 切割. generally lower, from material pellet cutting machine positive 确切割 pellets is 一 直角圆柱体, from water lower pellet cutting machine positive pellet cutting is 一 近乎完美 球形.

usually, easy material 末 材 material 也会因 is 拖尾而 generate material 末. false has processing parameters 都经 检查, generally can can by diagnosis is issues.

for/regarding material pellet cutting production 线而言, its solution methods is more 换滚刀 and 底刀以 provide new 且锋利 切刃; or according to manufacturing manual/handbook 规定 数 value heavy new equipment 间距.

for/regarding water lower pellet cutting 线而言, need 检查模 sheet/plate and 刀刃, ensure has 刻痕, is and 沟槽常常引起拖尾.

for/regarding many crystallization property material 而言, general purpose polystyrene (PS), material 末似乎 is types Common has 危害. it therefore formed is processing need for issues, is is it 们会改变材 material density, in extrusion machine machine in degradation or 烧焦, is process belt/tape 麻烦. resin production main/primary target/goal is production 均一 粒形, tool has long degree and 直径, has material or outer material 质 污染.

针 for issues, can through adjustment equipment control important process parameters, to decrease light material 末 目. 当进入切刀时, material production temperature degree can can 接近材 material soft 化点, ensure material can can to hot 切, from 而避免破裂.

针 for polymer, selection belt/tape has pellet cutting degree 滚刀, in decrease/reduce material 末方面发挥 important function. for/regarding filling polymer, amount use 司太立 alloy or tool 钢滚刀, make and 底刀刀口 maintain 锋利, 以避免弄碎 polymer. for/regarding pellet cutting rear rear equipment, add pressure also is true equipment, need 避免裹入空 gas.

for/regarding water lower pellet cutting 线, need ensure in processing process in maintain 足够 顶住模面 刀 pressure, 并适当 adjustment pellet cutting rear time, ensure pellets drying machine is hot.

pellet cutting equipment is types hard carbon sheet/slice, in its 适当位置 upper has alloy, can make it through 螺纹安装 to upper. usually, 底刀 刀刃转动 rear 就会出现底刀破裂 phenomenon, for 此, can 采取适当 measures this type of issues, in process in need fine manufacturing equipment manual/handbook upper recommendation method 进行.

in 此, need especially strong/high 调 一点 is, has 螺纹 因瓦 alloy rod is through solid to 位, it has 一 剪切限 made, easy in 安装时 by large 转矩破 bad. another, in or in, 破裂 底刀 easy 发生移位, in pellet cutting machine in dispersion, bad 滚刀 刀刃, improve/increase repair use.

shrinkage and 空心粒 material table/sheet material 回火不恰当. shrinkage light micro can can is pellets upper small 坑, heavy can can generate pellets, 就像调酒 rod 一样, this type of phenomenon 出现 情况 is, material temperature degree 接近熔 melt 状态, material by pellet cutting rear upper shrinkage. to positive 确回火 线 material, its interface temperature degree degree maintain 恒定, its by 切割时 for cooling 介质（空 gas or water ）没 has 响应.

shrinkage 空隙出现 specific causes is, processing water for polymer cold 时, material outer table/sheet cold 冻住, generate hard housing/shell, hot amount in material 芯部; another, material in gas or water in has 足够 浸泡 time, 导致线 material hot amount can to material surface, from method 进行良 good cooling.

water lower pellet cutting production pellets, due to melt in in by 困 挥发 material, 也会出现 shrinkage 空隙, types has 效 预 anti measures is extrusion machine upper true 空孔.

线 material is material in 喂入平台 upper in toward 一边集束 倾 toward 状态, it 会引起 material quality 变差, in fine long strip/profile and processing and other issues.

if pellet cutting machine 切割平面没 has 平行于 extrusion machine strip/profile sheet/plate, that material will 会出现 toward left or right 边拥挤 trend, most 终导致线 material 漂移.

another, formed material other causes also lower 喂入辊 and 刮刀 间隙不恒定, lower 喂入辊 直径不一致 and other.

fine long strip/profile is pellet cutting machine production 出 一 type non positive product, 顾名思义, its long degree ratio pellets dimensions long, long dimensions usually in 几英寸 scope/range inner 变动. fine long strip/profile （也称 is 斜角切割 pellets ） 出现 table/sheet material 喂入滚刀时 线 material control good, specific is due to material in 喂入滚刀时并 non 处于垂直角 degree, therefore in 切割时, material will 出现一 倾斜角 degree.

喂入辊（咬入点） and 滚刀（切割点） between 距离称 is pressure 进距离, in this degree upper has 任何东西 use control material. pellet cutting machine different sheet/plate 刨床, if 喂入辊安装不 positive, or 者工况差, that plastics material will 不会以垂直于切割面 角 degree to plant/unit in, 如此一, material 开始彼此交叉, 引起切割 quality 进一步恶化, most generate heavy issues. 交叉 线 material will make 两 喂入辊彼此 separation 开, make material 失 张 force, 进而导致线 material 暂时垂落, make material toward 喂入辊 两边. upper issues 预警信号 is, upper 喂入辊处于糟糕 工况, in 沟槽, cracks or color （ aging or hot hard 化） and other phenomenon.

other material control Common issues also 包括: lower 喂入辊 abrasion loss, this will 引起牵引 force loss 失; positive 确 线 material process, this will 会导致线 material 象蛇一样剧烈 bending; also has abrasion loss material sheet/plate, it will generate various different material. not only 如此, manufacturing also need 警惕极端 abrasion loss and 顶住线 material 底刀, is negative 责 线 material to 切割点, anti 止切刀 in ultra-high speed lower 运转, is this type of ultra-high speed 会引起线 material 摇摆.

in water lower pellet cutting system in, fine long strip/profile generate main/primary causes is due to speed degree and speed degree 不匹配, in 此情况 lower, need increase speed degree 匹配喂入 speed degree, or decrease small speed degree 匹配切刀 speed degree. another, in processing process in also need ensure 切割刀头 upper has 足够 刀 sheet/slice, ensure pellets tool has positive 确 几何形状, 并检查 is has 模孔发生 polymer material slow or retardant 塞.

increase agent and PVC separation between function force is relatively low 范德华 force and hydrogen 键, in processing and use increase agent easy toward outer 界发生迁移 expand dispersion.

increase agent expand dispersion methods main/primary has types:

① from PVC products surface 挥发至 large gas in;

② by PVC products liquid versus 抽出;

③ toward PVC products solid or semi solid material in 发生迁移 expand dispersion;

④ in pressure function lower 由PVC products in 渗出.

increase agent expand dispersion main/primary 经历三 stage/phase: increase agent toward inner surface expand dispersion, in inner surface formed “横卧”状态, expand dispersion products surface.

increase agent expand dispersion can is polymer in small separation material 质 传递, is in polymer 链段间 空隙进行迁移. polymer separation 子链段 usually 包括线 type, type and crosslinked type, 而链段间 also generate and 堆砌, therefore, polymer internal 空间网络 structure its complex, meanwhile in and non 晶区. non more is 无定形形式, 链段间空隙 more 于晶区, therefore, small separation in 晶区 迁移 expand dispersion speed degree low non 晶区. 晶区, non 晶区, separation 子链段形态会随 temperature degree and other outer conditions 变化而发生变化.

effect/influence increase agent in PVC products in expand dispersion factors main/primary has temperature degree, PVC products features, increase agent separation features, increase agent content, and other.

① temperature degree: temperature degree can significantly effect/influence expand dispersion 发生, temperature degree high, hot active can large, 迁移越容 easy 发生.

②PVC products features: main/primary in 链段自由体积 and 链段运动 features. increase agent separation 子移动 需 most small 自由体积 small polymer/macromolecule 链段自由体积时, increase agent separation can expand dispersion through polymer/macromolecule 链段. PVC in 自由体积越 large, increase agent separation 子越容 easy 发生迁移. PVC separation 子链段不 saturated and degree high, property strong/high, increase agent easy expand dispersion.

③ increase agent separation features: increase agent versus for separation quality effect/influence its can force, versus for separation quality large, in PVC products in difficult expand dispersion. increase agent separation 子体积 versus meanwhile, or long separation increase agent need ratio separation increase agent easy 于发生 expand dispersion.

④ increase agent content: its it conditions versus meanwhile, increase agent content large, 迁移越容 easy 发生.

⑤介质: generally 说, increase agent by versus solvent agent relatively easy, by water versus relatively difficult.

is made increase agent expand dispersion process 发生, made increase agent methods has PVC surface treatment, PVC grafting modified, and polymer/macromolecule increase agent blending, add nano pellets, add 入蒙脱土, has machine solvent agent 浸泡, and PVC形 formed 共价键, increase agent modified and other.

（1）PVC surface treatment

① surface crosslinked.

for PVC surface crosslinked, can decrease/reduce PVC链段间 空隙, from made increase agent expand dispersion. PVC surface crosslinked can formed crosslinked structure, for increase agent separation formed “牵拉”, “包裹” function, retardant increase agent expand dispersion. crosslinked modified methods usually is will PVC and nitrogen material, 硫化钠 and other reaction, and other 离子处理, or 进行紫 outer light 照射.

② surface coating.

is decrease/reduce polymer inner increase agent and 抽出, can using/adopting in polymer surface 包覆一层 non material methods. will Cl原子 by modified PVC solvent understanding in has machine solvent agent in, will its coating in soft 质PVC products surface, through add hot or outer light make coating solid 化, using/adopting methods formed 一层30μm thin can retardant increase agent 迁移.

（2）PVC grafting modified

for PVC grafting modified can will PVC separation and its it function through separation 子键连接起, made or decrease/reduce PVC链段运动, decrease/reduce increase agent expand dispersion. β– ring 糊精(β–CD) is 由7 吡喃葡萄糖 separation 子连接形 formed ring combined material, tool has 圆台形空腔 structure, due to 羟基存 in tool has hydrophilic water property, inner due to C—H键存 in tool has hydrophobic water property, hydrophobic water property structure can 吸附并包埋 increase agent separation 子, from made increase agent 迁移. meanwhile, grafting rear β–CD形 formed bending can made increase agent 迁移. add β–CD technology simple, and PVC versus property relatively 差, non-uniform.

（3） and polymer/macromolecule increase agent blending

has polymer/macromolecule material and PVC blending 时, and PVC tool has good versus property, can reduce PVC 玻璃化转变 temperature degree, improve/increase flexible, to and small separation increase agent similar function, can as is PVC polymer/macromolecule increase agent. meanwhile, type increase agent molecular weight relatively high, usually large 于1000, and small separation increase agent versus ratio tool has good resistant property and low temperature resistance property, also is type increase agent. polymer/macromolecule increase agent generally price 昂贵, add rear reduce PVC products transparent degree, meanwhile, polymer/macromolecule increase agent in efficiency issues, and small separation increase agent rear can reinforcement efficiency.

polymer/macromolecule increase agent main/primary has type, separation is polyester, ethylene copolymer and elastomer. polyester increase agent saturated and binary acid and binary alcohol polycondensation formed, molecular weight in 800～8000. polyester increase agent and small separation increase agent rear, can 够吸引 and solid small separation increase agent, retardant its toward PVC surface expand dispersion. ethylene copolymer main/primary has ethylene –乙 acid ethylene ester copolymer, ethylene – acrylic copolymer, ethylene –一 oxidation carbon –乙 acid ethylene ester copolymer (Elvaloy) and other. Elvaloy is DuPont company product, tool has excellent increase 塑效果. 丁腈橡胶(NBR) is types elastomer increase agent, NBR and DOP复配 rear, can decrease/reduce DOP 迁移.

（4） add nano pellets

nano pellets ratio surface large, surface more, surface 原子周围缺 less versus 邻原子, has relatively more 悬空键, tool has saturated and property, easy its it material 质, property small separation increase agent. meanwhile, nano pellets in PVC in 本身不 easy 迁移, can for PVC separation and increase agent separation 子 运动起 to retardant function. therefore, in PVC in add nano pellets can decrease/reduce increase agent 迁移.

add nano pellets technology simple, cost low, reduce increase agent efficiency, and can can reduce PVC products resistant water property, transparent property and force property can and other.

（5） add 入蒙脱土

蒙脱土 is types water silicon aluminum acid salt viscous 土, tool has sheet/slice structure, sheet/slice thick degree 约l nm. 蒙脱土经 has machine modified rear, sheet/slice 层间层间距 increase large, will 蒙脱土 and PVC mixing/compounding, can make 蒙脱土 sheet/slice mono sheet/slice dispersion in PVC in, sheet/slice structure can for increase agent separation formed “迷宫通路”, retardant increase agent 迁移, from to made increase agent function.

however, 蒙脱土 add increase PVC processing difficult degree, meanwhile 不利于PVC heat stabilized property.

（6） has machine solvent agent 浸泡

increase agent in PVC in expand dispersion is through PVC链段间 空隙进行, has increase agent PVC can as 处于橡胶态, PVC separation 子链段 soft/flexible; 当PVC in increase agent 时, can as 处于玻璃态, PVC separation structure 致密, has 空隙. will PVC products short time in has machine solvent agent in 时, PVC products surface increase agent 先迁移至 has machine solvent agent in, formed 两层不含 increase agent 玻璃态“ crystallization thin 层”, PVC internal increase agent again toward solvent agent 迁移时, to “ crystallization thin 层” retardant 挡, expand dispersion speed degree decrease slow.

（7） and PVC形 formed 共价键

PVC separation and increase agent separation between chemical in, versus function low, in processing and use process in, increase agent easy 发生迁移 expand dispersion. if will increase agent separation grafting to PVC separation upper formed 共价键, make increase agent formed is PVC separation, can has 效避免 increase agent expand dispersion, generally is will small separation increase agent hydrophilic 核取代PVC separation upper Cl.

（8） increase agent modified

is reduce or remove small separation increase agent 渗出, can for small separation increase agent modified 处理, increase large small separation increase agent property or molecular weight. commonly used methods has toward increase agent in 引入Cl原子, chlorine 化原位 grafting, in small separation increase agent upper grafting large separation 子基团 and other methods. utilizing 自由基取代连锁 reaction, will Cl引入脂肪 acid ester in, to chlorine oxygen 基脂肪 acid ester, improvement increase agent and PVC versus property and resistant property, tool has flame retardant property can.