Shanghai Daoqin Plastics Co., Ltd.

        TPE injection molding parts surface issues, causes is raw materials quality 差, and formulation dispersion non-uniform has 关系, its and injection molding process parameters has 关.

        1, whitening phenomenon :

        指 stabilizer and other combined agent 迁移至 molding product surface, its surface upper powder 一样呈现出一 types white phenomenon.

         causes: main/primary is due to stabilizer amount combined or and polymer versus 容而引起, versus can add 入南京塑泰 related compatibilizer solution. selection and polymer versus property good stabilizer or will stabilizer use amount control in most scope/range.

         its 次, more formed versus for separation quality high stabilizer is separation has 效. another, has through 迁移至 molding product surface its function stabilizer. 例如, anti-static agent, lubricant and other. for this type of stabilizer 讲, selection make 迁移也 difficult 以出现 whitening stabilizer is non necessary.

         thermoplastic property elastomer in generally ring lower use very less 会出现 whitening issues, in high temperature, wet, outer long use combined, is improve/increase resistant property in combined upper add resistant heat stabilized agent (anti agent), resistant stabilizer is separation necessary. especially is high temperature lower, its easy 引起迁移, therefore stabilizer selection is versus important.

        2, viscous phenomenon :

         and resin versus ratio, soft thermoplastic property elastomer surface more easy generate viscous phenomenon.

         causes: main/primary is aging formed low versus for separation quality polymer and increase agent, stabilizer 迁移至 surface 而引起. 但无论 哪 types 情况, using/adopting outer light method (IR) and other analysis 手段, through analysis viscous formed separation can comparison easy 确定出 and related material 质.

        发 viscous main/primary is molding temperature degree high, polymer hot separation understanding formed low versus for separation quality material 质 缘故. tube/pipe molding machine setting temperature degree 本身未达 to hot separation understanding temperature degree, in molding process in 剪切生 hot has 时也会 make its 暂时达 to high temperature.

         solutions: as is its countermeasures, reduce molding temperature degree, low 剪切化, use nitrogen gas molding machine liquid pressure internal is separation has 效. another, in molding machine 暂停时, material long time melt 状态置留 in molding machine mold cavity inner, has 时也会因 hot aging viscous. another, in high temperature lower use products very easy 出现发 viscous phenomenon. therefore, stabilizer, soft agent types type selection and use amount is non important.

        3, aging phenomenon :

         products mechanical properties obvious reduce, appearance quality 变差.

         causes: and machine material and metal material versus ratio, polymer/macromolecule material heat resistant, resistant outer property relatively 差引起 products aging. more products aging make its machine features obvious reduce, appearance quality 变差.

         solutions: through combined heat resistant, weather resistance and other stabilizer, through add outer absorption agent, light stabilizer methods, in 一定程 degree upper can made aging phenomenon generate. and injection molding has issues and its countermeasures.

        4, gas 孔:

         in molding product in 出现凹孔 phenomenon, main/primary is molding product in mold inner cooling process in shrinkage 而引起. remove requirements material must mold cavity outer, fast speed cooling is separation necessary. specific 讲, is improve/increase holding pressure (二次 pressure), reduce resin and mold setting temperature degree.

         another, for molding product 形状也 has very large property. due to in thick 部位极 easy gas 孔, therefore for this products 说, using/adopting in its 周围设 has 注胶口 or 流胶道 that 样 模 type design.

        5, flash/burrs :

         this is resin from mold cavity 溢出造 formed. for injection molding 讲, flash/burrs is positive 常, for resin or thermoplastic property elastomer is positive 常.

         its is:

         and 橡胶胶 material versus ratio, melt resin or thermoplastic property elastomer flow property relatively high, injection pressure comparison low;

         and mold 接触, cooling, in 瞬间即 can solid 化, flow. therefore, resin or thermoplastic property elastomer usually is easy flash/burrs phenomenon.

         as is countermeasures, 首先必 must reduce filling amount, reduce holding pressure and shrink short holding pressure time. another, for dimensions degree 差, separation type has mold 讲, its is non necessary. in molding product 投影面积 large, clamping force versus for low injection pressure combined, has 时也会出现 flash/burrs, therefore must use more large molding machine.

        6, flow 痕迹:

         in molding product surface gloss different strip/profile phenomenon.

         generally 讲, in resin injection molding in has:

        间隔 narrow strip/profile 纹状;

         in molding product surface upper lower 出现同位 versus comparison wide strip/profile 纹状;

         in molding product surface upper lower 出现异位 versus comparison narrow strip/profile 纹状三 types type type.

         solution this issues can through this methods solution, add pure mono resin, improve/increase injection speed degree, mold temperature degree, add large 注胶口, improve/increase resin temperature degree and injection speed rate, improve/increase molding temperature degree, mold temperature degree or reduce injection speed degree and other. through improve/increase injection speed degree and mold temperature degree is has 效.

        7, demolding property 差:

         demolding property molding product from mold in difficult 以取出 or in process in full deformation. tool has viscous property material easy this issues, using/adopting in material in add demolding agent or molding front in mold upper coating demolding agent methods can to improvement.

         molding product cooling 不足(solid 化不足)也容 easy this issues, therefore for molding product 进行充 separation cooling is non necessary. another, mold design combined 理也会 formed is difficult demolding causes, especially is in 注胶口, 进胶道 and other easy mold sticking 部位, add large 注胶口 拔出角 degree, add wide 进胶道都 is non has 效.

        8, color strip/profile 纹:

        以注胶口 is in 心出现放射状 strip/profile phenomenon, is material in water separation or formed separation gas 化引起. its in, in process in or mold inner 存留 空 gas 也会导致 this phenomenon generate. therefore, for property material in molding front 进行充 separation drying and reduce easy generate separation understanding property gas material molding temperature degree is non necessary.

        9, short shot :

        未充满 mold cavity phenomenon is short shot. this main/primary is 因填胶 amount and other molding conditions 不适而引起, molding gas separation or 流胶道不均衡(more mold)也会导致 this phenomenon generate.

        10, 烧焦:

         is filling 至端部 and 未充满 mold cavity separation 出现像烧焦 that aging phenomenon. this main/primary is gas separation, gas or generate gas 体引起 thermal insulation pressure shrink, make temperature degree significantly upper rise 而导致 结果(即: molding product surface hot aging).

         improvement gas methods is relatively good solutions, degree light lower, reduce injection speed degree can solution.

        11, color 泽不均一:

         in using/adopting thermoplastic property elastomer pellets and dry mixed material is material mixed combined material color 时, very easy molding product color 泽不均一 phenomenon, mixed combined non-uniform or combined good;

         as is countermeasures, use combined coupling agent, compatibilizer. improve/increase screw back pressure, strong/high filler mixing/compounding is has 效.