Shanghai Daoqin Plastics Co., Ltd.

         mono screw pressure machine using/adopting 先经塑化 rear material molding hard tube/pipe, therefore hard tube/pipe products good bad in very large degree upper 决定于 semi products material 塑化程 degree and uniform property.

        粒 material process generally has types: types is will and uniform powder material in pressure machine in rear, in machine upper 放出圆 strip/profile material meanwhile, 由旋转甩刀切 formed sheet/slice material;

        另一 types is will and material 经密炼 and pressure machine upper rear, made formed thick degree, wide degree material sheet/slice, formed 卷子, again pellet cutting formed 方形粒 material.

        1, extrusion pelletizing

         advantages is 密封连续化, equipment investment small, strong/high degree low, small, therefore is currently pelletizing process development trend. especially di screw pelletizing pressure machine, due to it mixing/compounding degree good, uniform, already to heavy 视.

        但 production in must attention/notes below/following 几点: raw materials must has fine degree, ensure in and machine in mixed and uniform, in pressure pelletizing process in, pellets 会出现三 salt property acid 铅 白点, black spots, and filling material block and other effect/influence quality.

         resin must selection hydrophobic type (即棉花球 type) resin, effect/influence pelletizing pressure machine 连续迸 material.

        挤 pressure machine machine temperature degree must control in low 于170℃, 以免粒 material outer already color, internal has micro 孔. this 样 粒 material in pipeline production in material unstable, easy separation understanding.

         pelletizing process in 必需经常调换 滤网, waste mixed 入, or due to by 打穿而破 bad positive as.

        2, 密炼滚 compression molding pelletizing

        密炼塑化 and 滚筒塑化 temperature degree 不宜太 high, 密炼塑化 material temperature ultra- 175-180℃, 滚筒塑化 间距不 ultra- 3 mm. low temperature more process is comparison 台理, meanwhile, 每一批粒 material requirements 塑化程 degree uniform 理想.

        现 separation lower: raw materials in mixed and process in must mixed combined uniform, in extrusion process in, salt property acid and hard acid easy 析出, and material stability property relatively 差, easy separation understanding.

         in 密炼塑化 process in, material temperature high, extrusion process in tube/pipe easy 发毛, 起泡.

        不 use machine, use 二道滚 compression molding production material 时, need attention/notes temperature degree low, tube/pipe easy 发脆, make experiment/testing can combined quality requirements.

        塑化 temperature degree high, in extrusion process in, pressure relatively large, electrical machine electrical 流就会 rise high.