板厚对夹芯注射成型芯层物料填充能力的影响
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摘要
基于Cross-WLF黏度控制方程,构建了3种典型夹芯注射成型芯/壳层物料组合,并研究了不同物料组合时板厚对芯层物料填充能力的影响。研究表明,调整板厚将使芯、壳层熔体流动状态和黏度发生变化,但上述变化因物料组合不同而呈现显著的差异性:当芯层熔体流动指数相对壳层熔体更大时,随板厚增大,芯/壳层熔体黏度比(R)减小,芯层物料填充能力降低;当芯层熔体流动指数相对壳层熔体更小时,随板厚增大,R增大,芯层物料填充能力升高;当芯、壳层熔体流动指数相当时,上述现象均不明显。
Based on Cross-WLF viscosity control equation,three typical core/skin material combinations for sandwich injection moulding were constructed,and the effect of plate thickness on the filling capacity of core material under different material combinations were studied. The results show that the flow state and viscosity of core and shell melt would be changed by the adjustment of plate thickness,however the above changes could show significant differences due to different material combinations. When the flow index of core melt is larger than the skin melt,with the increase of plate thickness,the viscosity ratio of core/shell melt( R) could decrease,and the filling capacity of core material would decrease. When the flow index of core melt is smaller than the skin melt,with the increase of plate thickness,R could increase,and the filling capacity of core material would increase. When the flow index of core and skin melt is equal,the above phenomena are not obvious.
Based on Cross-WLF viscosity control equation,three typical core/skin material combinations for sandwich injection moulding were constructed,and the effect of plate thickness on the filling capacity of core material under different material combinations were studied. The results show that the flow state and viscosity of core and shell melt would be changed by the adjustment of plate thickness,however the above changes could show significant differences due to different material combinations. When the flow index of core melt is larger than the skin melt,with the increase of plate thickness,the viscosity ratio of core/shell melt( R) could decrease,and the filling capacity of core material would decrease. When the flow index of core melt is smaller than the skin melt,with the increase of plate thickness,R could increase,and the filling capacity of core material would increase. When the flow index of core and skin melt is equal,the above phenomena are not obvious.
引文
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[2]ZHANG K Y,NAGARAJN V,ZARRINBAKHSH N,et al.Co-injection molded new green composites from biodegradable polyesters and miscanthus fibers[J].Macromol Mater Eng,2014,299(4):436-446.
[3]孟健,陈金涛,李桂丽,等.聚丙烯共注射成型柱晶形成判据研究[J].中国塑料,2018,32(8):40-45.
[4]KIM N H,ISAYEV A I.Birefringence and interface in sequential co-injection molding of amorphous polymers:Simulation and experiment[J].Polym Eng Sci,2015,55(1):88-106.
[5]王湘冀,陈怀民,李德勤.夹芯共注成型技术在卫浴行业的应用[J].塑料工业,2012,40(2):45-48.
[6]邢攸冬,马孝松.不同胶厚对硬聚氯乙烯板搭接强度的影响[J].塑料,2018,47(3):80-83.
[7]黄志超,程梁.未缝合与缝合玻纤泡沫夹层复合板弯曲性能研究[J].塑料工业,2018,46(8):89-94.
[8]姜开宇,鲁勇,杨磊,等.共注成形过程中聚合物流动特性的物理可视化试验[J].高分子材料科学与工程,2018,34(8):102-106.
[9]MOHSENZADEH A,ESCROCHI M,AFRAZ M V,et al.Non-hydrocarbon gas injection followed by steam-gas co-injection for heavy oil recovery enhancement from fractured carbonate reservoirs[J].J Petrol Sci Eng,2016,46(8):121-130.
[10]王利霞,卢松涛,朱文娜,等.共注射成型中芯/壳层材料黏度比对追赶距离的影响[J].高分子材料科学与工程,2010,26(3):116-118.
[11]喻选,辛勇.聚合物剪切流变特性及其结晶行为研究[J].塑料工业,2017,45(12):74-77.
[12]王广龙,沈俊芳,侯树森,等.等规聚丙烯顺序共注射制件的结构与性能[J].高分子材料科学与工程,2017(11):67-74.