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1、购买设计文档后加Q-97666224免费领取CAD图纸题目热吸成型辅机毕业设计专业学生姓名╳╳╳学号指导教师╳╳╳论文字数完成日期2015年4月购买设计文档后加Q-97666224免费领取CAD图纸摘要聚氯乙烯为白色蜡状半透明材料,柔而韧,可分为低密度聚氯乙烯(LDPVC)和高密度聚氯乙烯(HDPVC)两大类,LDPVC是由乙烯在高压(98-250MPa)下制得,密度大约在0.91-0.92g/m3之间,HDPVC由乙烯在1.0MPa压力下聚合而成,密度较高,约为0.94-0.96g/cm3t。聚氯乙烯无毒,具
2、有优异的介电性能,它的玻璃化温度约为一125~C。聚氯乙烯具有优异的化学稳定性,室温下能耐酸和碱,但容易受光氧化、热氧化,在紫外线下还可发生光降解。聚氯乙烯还具有优异的力学性能,其结晶部分赋予聚氯乙烯较高的强度,非结晶部分赋予其良好的柔韧性。在热塑性材料的软化温度和熔融温度之间使其在纵向或横向拉伸,使分子具有定向性,冷却后使定向性定型,称为定向技术或拉伸技术。拉伸膜(又称拉伸回缩膜、缠绕膜)是一种在常温下具有良好弹性和耐穿刺性能的膜材料,拉伸倍率高达200%-300%,并具有较大的回缩性、持久的束紧力、适宜的透
3、气和透湿性等。。关键词:聚氯乙烯;热拉伸;透气购买设计文档后加Q-97666224免费领取CAD图纸AbstractPolyvinylchlorideas awhitewaxy translucentmaterial, softandtough, canbedividedinto lowdensitypolyvinylchloride (LDPVC) andhighdensity polyvinylchloride (HDPVC) two, LDPVCiscomposedofethylene athighpre
4、ssure (98-250MPa) was about0.91-0.92g /m3, thedensityof between HDPVC, theethylenepolymerization underthepressureof1.0MPa and a, thehigherdensity, isabout0.94-0.96 g /cm3t.Polyvinylchloride nontoxic, has excellentdielectricproperties, glasstransitiontemperat
5、ure isabout 125~Cit. PVC with excellentchemicalstability, acid and alkali atroomtemperature, but susceptibleto oxidation,thermaloxidation, ultraviolet light degradation canoccur. PVC has excellentmechanicalproperties,crystallization of polyvinylchloride with
6、 highstrength, non crystallinepart hasgood flexibility. Thethermoplasticmaterial softeningtemperature andmeltingtemperature inthe longitudinalor购买设计文档后加Q-97666224免费领取CAD图纸transversetensile, themolecule isdirectional, directional cooling after setting, called
7、 directionaltechnology or drawingtechnology. Tensile membrane (alsoknownas tensilemembraneretraction, wrappingfilm) isakindofmembrane materialwithgood elasticity atambienttemperature and punctureresistance, tensile rate ashighas200%-300%, andhas retracted, f
8、asteningforce, lasting for airpermeabilityandwatervaporpermeability of.Keywords::Polyvinylchloride; tensile; permeability目录第1章绪论11.1热吸成型概述1购买设计文档后加Q-97666224免费领取CAD图纸1.2热吸成型辅机国内外研究状况2第2章设计内容32.1