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style="margin-top:8px;text-indent:38px"><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">其次由于透明塑料多为熔点高、流动性差,因此为保 证产品的表面质量,往往要在机高温度、注射压力、注射速度等工艺参数作细微调整,使注塑料时既能充满模,又不会产生内应力而引起产品变形和开裂。因此从原料准备,对设备和北京塞车pk10全天计划网页版要求、注塑工艺和产品的原料处理几方面都要进行严格的操作。</span></p><p style="margin-top:8px;text-indent:38px"><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">一、料的准备与干燥由于在塑料中含有任何一点杂质,都可能影响产品的透明度,因此和储存、运输。加料过程中,必须注意密封,保 证原料干净。特别是原料中含有水分,加热后会引起原料变质,所以一定要干燥,并在注塑时,加料必须使用干燥料斗。</span></p><p style="margin-top: 8px; text-indent: 38px; text-align: center;"><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white"><img src="/Uploads/image/20181230/1546135135238006.jpg" title="" alt="IMG_20181219_161858"/></span></p><p style="margin-top:8px;text-indent:38px"><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">还要注意一点的是干燥过程中,输入的空气应经过滤、除湿,以便保 证不会污染原料。其干燥工艺如,透明塑料的干燥工艺:材料工艺干燥温度(</span><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">℃</span><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">)</span><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">干燥时间(h)料层厚度(mm)备注pmma70~802~430~40pc120~130>6<30采用热风循环干燥pet140~1803~4采用连续干燥加料装置为佳</span></p><p style="margin-top:8px;text-indent:38px"><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">二、机筒、螺杆及其附件的清洁为防止原料污染和在螺杆及附件凹陷处存有旧料或杂质,特别热稳定性差的树脂存在,因此在使用前、停机后都应用螺杆清洗剂清洗干净各件,使其不得粘有杂质,当没有螺杆清洗剂时,可用pe、ps等树脂清洗螺杆。</span></p><p style="margin-top:8px;text-indent:38px"><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">当临时停机时,为防止原料在高温下停留时间长,引起解降,应将干燥机和机筒温度降低,如pc、pmma等机筒温度都要降至160</span><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">℃</span><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">以下。(料斗温度对于pc应降至100</span><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">℃</span><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">以下)</span></p><p style="margin-top:8px;text-indent:38px"><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">三、在北京塞车pk10全天计划网页版设计上应注意的问题(包括产品的设计)为了防止出现回流动不畅,或冷却不均造成塑料成型不良,产生表面缺陷和变质,一般在北京塞车pk10全天计划网页版设计时,应注意以下几点。</span></p><p style="margin-top:8px;text-indent:38px"><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">a=</span><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">壁厚应尽量均匀一致,脱模斜度要足够大;</span></p><p style="margin-top:8px;text-indent:38px"><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">b=</span><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">过渡部分应逐步。圆滑过渡,防止有尖角。锐边产生,特别是pc产品一定不要有缺口;</span></p><p style="margin-top:8px;text-indent:38px"><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">c=</span><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">浇口。流道尽可能宽大、粗短,且应根据收缩冷凝过程设置浇口位置,必要时应加冷料井;</span></p><p style="margin-top:8px;text-indent:38px"><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">d=</span><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">北京塞车pk10全天计划网页版表面应光洁,粗糙度低(建议低于0。8);</span></p><p style="margin-top:8px;text-indent:38px"><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">e=</span><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">排气孔。槽必须足够,以及时排出空气和熔体中的气体;</span></p><p><span style="font-size:19px;font-family: '微软雅黑','sans-serif';color:#262626;background:white">f=</span><span style="font-size:19px;font-family:'微软雅黑','sans-serif';color:#262626;background:white">除pet外,壁厚不要太薄,一般不得小于lmm。</span></p><p><br/></p></p></div> <div class="relevant_new"> <h3 class="left_h3"><span>相关新闻</span></h3> <ul class="right_new"> <li><a href="/bmV3cy80Ml8zMjY=.html" title="注塑北京塞车pk10全天计划网页版为什么要设置排气系统?">注塑北京塞车pk10全天计划网页版为什么要设置排气系统?</a><span class="news_time">2019-01-07</span></li><li><a href="/bmV3cy80Ml8zMjQ=.html" title="注塑北京塞车pk10全天计划网页版怎么验收才好?">注塑北京塞车pk10全天计划网页版怎么验收才好?</a><span class="news_time">2019-01-04</span></li><li><a href="/bmV3cy80Ml8zMjI=.html" title="注塑缺陷:高光产品表面发雾怎么解决?">注塑缺陷:高光产品表面发雾怎么解决?</a><span class="news_time">2019-01-02</span></li><li><a href="/bmV3cy80Ml8zMjE=.html" title="透明塑料制品注塑成型工艺,你都了解吗?">透明塑料制品注塑成型工艺,你都了解吗?</a><span class="news_time">2018-12-30</span></li> </ul> </div> </div> <div class="col-xs-12 col-sm-4 col-md-3"> <h3 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