Shanghai Daoqin Plastics Co., Ltd.

塑 parts gloss defect main/primary causes is: mold, injection molding process , raw materials and other 方面.

一, injection molding mold

      1.若 mold type processing defect, has 伤痕, micro 孔, abrasion loss, coarse and other 不足, 势必会 reaction to parts upper, make parts gloss defect, for 此, need processing mold, make type surface has relatively small coarse degree, necessary can light 镀铬.

      2.若 type surface has 油污, water 渍, or demolding agent make more, make parts surface dark, has gloss, for 此, need and remove and water 渍, amount use demolding agent.

      3.若塑 parts demolding degree small, demolding difficult, or demolding force large, make parts surface gloss *佳, for 此, need add large demolding degree.

      4.若 mold gas defect, more gas 体停留 in type inner, 也导致 gloss defect, for 此, need and positive mold gas system.

      5.若 gate or runner 截面积 small or 突然变化, melt in its in flow 时受剪 force function large, flow flow, gloss defect, for 此, 应适当 add large gate and runner 截面积.

二, injection molding process

        1.若 injection speed degree small, parts surface 不密实, gloss defect, for 此, can improve/increase injection speed degree.

        2. for/regarding thick parts, cooling separation, its surface 会发毛, gloss dark, for 此, improvement cooling system.

        3.若 holding pressure pressure 不足, holding pressure time short, make parts density 不够而 gloss defect, for 此, increase large holding pressure pressure and holding pressure time.

        5.若 melt temperature degree low, make flow property relatively 差, easy gloss defect, for 此, 应适当 improve/increase melt temperature degree.

        6. for/regarding crystallization resin, 如PE, PP, POM and other made as parts, cooling non-uniform 会导致 gloss defect, for 此, improvement cooling system, make uniform cooling.

        7.若 injection speed degree large, gate 截面积 also small, product 附近会发 dark gloss defect, for 此, can reduce injection speed degree and increase large gate 截面积.

三, Raw Materials

        1. Raw Materials degree relatively large, make difficult uniform 塑化, gloss defect, for 此, will Raw Materials 进行筛 separation 处理.

        2. raw materials in recycled material or water material add more, effect/influence melt uniform 塑化而 gloss defect, for 此, decrease/reduce recycled material or water material add amount.

        3. has Raw Materials in temperature separation understanding color gloss defect, for 此, selection resistant temperature property relatively good Raw Materials.

        4. Raw Materials in water separation or easy material content high, hot 时挥发 formed gas 体, in type and melt in shrink, 导致塑 parts gloss defect, for 此, for Raw Materials 进行预 drying 处理.

        5. has additives dispersion property 太差而 make parts gloss defect, for 此, use flow property can relatively good additives.

        6. Raw Materials in mixed has material, material or versus solvent material material, it can and its raw materials uniform mixed in 一起而导致 gloss defect, for 此, 应事先严格 troubleshooting this material.

        7.若 lubricant use amount less, melt flow property relatively 差, parts surface 不致密, make gloss defect, for 此, 应适当 increase lubricant use amount.