Shanghai Daoqin Plastics Co., Ltd.

疫情接近尾声, material basic 恢复, market easy in 逐步迈 toward positive 轨.

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01, 断 strip/profile generate 原不足

increase 滤网目数 or 张数; 适当调 low machine speed or high material speed;

适当 reduce extrusion processing temperature degree （ machine or other 各区）.

02, external 杂质

检查 mixed material and material step/link equipment is 否清理 dry and is has mixed 入;

尽 amount less add material or for material 进行初筛, remove 杂质;

increase 滤网目数 and 张数;

尽 amount cover/cap can can has material 掉落 孔洞（实 cover/cap or cover/cap ）.

03, internal 杂质

machine pressure high （包括口模堵塞, 滤网太 more, machine temperature degree low and other ）, formed increase 而导致炭化 add heavy, material by belt/tape to material strip/profile in, in force function lower, formed strip/profile;

extrusion machine local hot, formed add heavy, material by belt/tape to material strip/profile, in force function lower, formed strip/profile;

screw local strong/high, formed material material local add heavy, material by belt/tape to material strip/profile, in force function lower, formed strip/profile;

machine use year long, screw and machine abrasion loss, increase large, increase, machine viscous 附 炭化 material increase, extrusion time long, material by belt/tape to material strip/profile, in force function lower, formed strip/profile;

true or 自然排 gas 口（此处包括垫 sheet/slice and 死角） long time 不清理, in material by belt/tape to material strip/profile, in force function lower, formed strip/profile;

machine 头口模（此处包括出 material and machine internal 死角）未清理 dry 净, 口模里面含 has material or by belt/tape to material strip/profile, in force function lower, formed strip/profile;

more 换滤网 time 间隔太 long, by 堵住, material material 出不, formed strip/profile.

04, material material defect

extrusion temperature degree low or screw 剪切太 low, material material separation 塑化, material 疙瘩, in force function lower, formed strip/profile;

formulation system in low melting point additives （包括EBS or PETS and other ）, in screw low or screw and machine 筒间隙 increase large and 剪切偏 low front lower, formed defect, formed strip/profile.

05, raw materials material property 变化

blending separation in temperature degree, flow property in large 差异, due to flow property 不匹配 or full versus 容（包括 material 理缠结 and chemical reaction ）, upper this type of 叫“ versus separation 离”, “ versus separation 离” generally in blending extrusion 不会出现, relatively more in injection molding process in, if MFR versus large, in screw versus for relatively low front lower, can can 出现断 strip/profile;

blending separation degree 变化: for 同一材 material 而言, if MFR decrease small, hardness, rigid property and 缺口变 large, has can can material molecular weight relatively front has large, formed degree large, in has processing temperature degree and process function lower, formed defect, improve/increase extrusion temperature degree or reduce machine screw speed can solution.

06, material strip/profile or gas 不畅

processing temperature degree high or screw local 剪切太 strong/high or screw local hot, formed certain flame retardant and other additives separation understanding, 释放出 gas 体, true and will gas 体抽出, gas in material strip/profile 里面, in force function lower, formed strip/profile;

material material 受潮严 heavy, processing water and 时经 自然排 gas and true troubleshooting, 汽体困 in material strip/profile, in force function lower, formed strip/profile;

自然排 gas or true gas 不畅（包括堵塞, gas, sheet/slice high and other ）, formed has gas （ or 汽）困 in material strip/profile 里, in force function lower, formed strip/profile.

07, material material rigid property large, water cold or water more, 牵引不匹配

material material rigid property large, water temperature low, water more, machine 头 出 material very soft, water 则立刻变 non hard, in force 不匹配 function lower, formed strip/profile —— this type of phenomenon 常出现 in PBT or PET add 纤, PC add 纤, AS add 纤, ABS add and other crystallization speed degree non fast or rigid property non large material, especially is small machine 做实验 relatively heavy, improve/increase water temperature, reduce water amount, let pellet cutting machine material strip/profile maintain soft/flexible degree, can solution.

08, 滤网目数 low or 张数不够

this type of phenomenon 常出现 in upper machine pressure 不足, external and internal 杂质 时候.

09, 连粒 issues

versus viscous 连 一 series material, usually by is di or its generate causes can can is processing water temperature high or water speed degree low 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. 例如, processing water hot is formed 连粒 一 causes, in 此情况 lower, reduce water temperature to pellets surface 足够 淬 cold; another, 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. in addition, 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.

10, 拖尾 issues

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.

11, powder issues

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 钢（Stellite） 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.

12, 底刀破裂 issues

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.

13, 线 material issues

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.

14, 线 property control issues

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.