Shanghai Daoqin Plastics Co., Ltd.

        何 is versus film for “晶点” this 词一定 very 熟悉, simple is product 瑕疵.

         in upper for its understanding is: polymer molecular weight high 于周围同 types polymer molecular weight, generate degree polymer.

        晶点 generate causes

        晶点 usually is machine equipment, processing process, material material and other formed. polymer generate mechanism is is poly material generate, therefore need can can generate poly material has can can 导致晶点.

         raw materials effect/influence

        说 is raw materials effect/influence its is raw materials catalytic agent effect/influence.

         polymer production has catalytic agent 残留, in molding processing process in, has catalytic agent polymer melt viscous production equipment surface, in high temperature lower, catalytic agent for polymer 继续进行 catalytic polymerization function, therefore formed degree polymer.

         different resin polymerization equipment and process different, for catalytic agent pure degree has 差异, its for polymer in formed film in generate has different effect/influence, polymer in catalytic agent content low, equipment structure good, raw materials 本身 含 晶点就 less.

         polymer in oxygen effect/influence

         this main/primary is processing temperature degree relatively high 时, oxygen make polymer oxidation generate 自由基吸附 in 口模壁, 自由基 as is active property in 心引发 other polymer separation reaction, in 此处形 formed high concentrated degree unstable polymer, in high temperature lower formed color 点.

         add 入一定数 amount antioxidant, has anti oxygen for generate function.

         processing process, equipment effect/influence

         processing process main/primary is temperature degree control and other effect/influence, raw materials long time hot, degree polymerization, degradation 会导致晶点 generate.

         its very more is equipment 导致, 例如:

         film blowing machine 模头部位 design 欠佳, in 死角, formed a small amount of raw materials long time hot, degree polymerization, degradation;

        吹模 machine long ratio 配置, design and other;

         screw upper or inner upper due to long 期 积累, generate 一 炭化 东西, this 炭化 东西 can as is 凝胶点, 不断 吸附 more more to it upper 面, meanwhile 也不断 沾 to film upper formed 谓 晶点.

        总而言之, molding equipment 定期清洗 has decrease/reduce generate.

        颜 filler, color masterbatch and other effect/influence

        现 in film production 习惯添 add color masterbatch, color masterbatch dispersion 欠佳会导致晶点 and other defect defect, masterbatch in selection material surface treatment unstable, in masterbatch processing process in “团 poly ”, formed “ powder 点”; masterbatch resin and formed film raw materials versus property 欠佳.

         decrease/reduce or remove methods

         understanding above 晶点 形 formed causes, can very easy for its control, is 您列出 below/following types methods:

        1, raw materials selection pure good resin, decrease/reduce catalytic agent effect/influence;

        2, film molding process in increase fine degree, 勤换滤网(especially is equipment), has 利于晶点 decrease/reduce;

        3, antioxidant and other amount add;

        4, in production process in add iron surface lubricant, decrease/reduce polymer melt viscous in equipment surface;