Shanghai Daoqin Plastics Co., Ltd.

         soft PVC pipe/tube production process/workflow separation is: raw materials front 处理, combined, pelletizing, extrusion pipe/tube 4 部 separation:

        1, raw materials front will use PVC resin, increase agent, stabilizer, lubricant, filling agent, material and other 进行 筛, abrasion.

        2, combined will good raw materials use low combined machine relatively long time combined, make various material dispersion uniform, lubricating absorption 效果良 good.

        3, pelletizing can extrusion or calendering mixing/compounding types methods will combined material pelletizing.

        4, extrusion pipe/tube use extrusion machine its material methods separation is 平挤垂拉 method [见图(a)] and 平挤平拉 method [见图(b)]进行 extrusion pipe/tube.

soft PVC pipe/tube extrusion plant/unit

         soft PVC pipe/tube molding process in phenomenon, generate causes and solution measures:

        一, surface gloss

         generate causes: defect, machine temperature degree low

         solution measures: improve/increase machine temperature degree, improve/increase machine temperature degree

        二, soft tube/pipe surface has pellets

         generate causes: resin 筛不当 or resin 本身鱼眼

         solution measures: more true resin or more resin

        三, tube/pipe 壁不圆

         generate causes: extrusion temperature degree high, cooling conditions combined 适

         solution measures: reduce processing temperature degree, adjustment water amount and cooling long degree

        四, surface has 云花, 斑状, coarse 糙面

         generate causes: machine temperature degree high, viscous material separation understanding, 开车时 temperature degree high

         solution measures: reduce machine temperature degree, 清理口模, adjustment temperature degree, front machine coating lubricant

        五, table/sheet pipe/tube 起泡

         generate causes: machine temperature degree high, semi formed product in has water separation

         solution measures: reduce temperature degree, semi formed product dry

        六, tube/pipe has material 痕

         generate causes: machine inner has 杂质, 口模, export has 伤痕

         solution measures: machine 头, will 口模, 芯模抛 light 处理

        七, has 熔接痕

         generate causes: separation runner structure combined 理, machine temperature degree low, machine pressure shrink ratio small, type long degree short, temperature degree high

         solution measures: separation runner structure, improve/increase machine temperature degree, machine design parameters

        八, material soft, tube/pipe lower 垂

        出 material soft, tube/pipe lower 垂

         generate causes: temperature degree control high

         solution measures: reduce temperature degree

        九, tube/pipe coarse fine non-uniform

         generate causes: machine and screw large, extrusion phenomenon, machine pressure shrink ratio small, material non-uniform, speed degree positive 常

         solution measures: machine need 检修, machine design, 检修供 material system, positive speed degree, adjustment pressure 辊

        十, tube/pipe 壁出现焦粒 or separation understanding 黄线

         generate causes: machine has 死角, material material local separation understanding, machine inner material local separation understanding, machine or machine temperature degree high, material material stability property 差

         solution measures: 拆模清理 or machine design, 清理主 machine, adjustment temperature degree, add hot 圈, formulation design, improve/increase material material stability property

        十一, tube/pipe surface has or 杂质

         generate causes: machine inner has separation understanding material

         solution measures: improve/increase speed, use material material belt/tape 出杂质 or separation understanding material, 若无效则 need 清理模头

        十二, tube/pipe large small specifications 不符

         generate causes: tube/pipe large: temperature degree low, tensile ratio small, tube/pipe small: temperature degree high, tensile ratio large

         solution measures: adjustment temperature degree, adjustment tensile ratio, adjustment temperature degree, adjustment tensile ratio