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</dd> </dl> </div> </div> </div> <div class="main_right"> <div class="sitemap"><a href="//www.vfhjc.icu/" title="qqɳ˺">qqɳ˺</a> > <a href="/news/gsxw/">公司新闻</a> > 详细内容 > 塑胶玩具厂家提醒您龟裂的原因都有哪些</div> <div class="content"> <div class="news_xaingxi"><h1>qqɳڲ:塑胶玩具厂家提醒您龟裂的原因都有哪些</h1></div> <div class="news_author"> 来源Q?a href='//www.vfhjc.icu/news/69.html'>//www.vfhjc.icu/news/69.html</a>   发布旉Q?018-01-17 </div> <div class="news_content"> <p> <a href="//www.vfhjc.icu/">qqɳ˺</a> www.vfhjc.icu <p> <span style="font-size:14px;">龟裂?b><a href="//www.vfhjc.icu/" title="qqɳ˺">qqɳ˺</a></b>在制作塑料制品较常见的一U缺P产生的主要原因是׃应力变Ş所致。主要有D余应力、外部应力和外部环境所产生的应力变形?/span> </p> <p> <span style="font-size:14px;">D余应力主要׃以下三种情况Q即充填q剩、脱模推出和金属镶嵌仉成的。作为在充填q剩的情况下产生的龟裂,其解x法主要可在以下几斚w入手Q?/span> </p> <p> <span style="font-size:14px;">1、由于直口压力损失最,所以,如果龟裂最主要产生在直口附近Q则可考虑改用多点分布Ҏ口、侧口及柄形浇口方式?/span> </p> <p> <span style="font-size:14px;">2、在保证树脂不分解、不劣化的前提下Q适当提高树脂温度可以降低熔融_度Q提高流动性,同时也可以降低注压力,以减应力?/span> </p> <p> <span style="font-size:14px;">3、一般情况下Q模温较低时Ҏ产生应力Q应适当提高温度。但当注速度较高Ӟ即模温低一些,也可减低应力的生?/span> </p> <p> <span style="font-size:14px;">4、注和保压旉q长也会产生应力Q将光当~短或进行Thơ保压切换效果较好?/span> </p> <p> <span style="font-size:14px;">5、非l晶性树脂,如AS树脂、ABS树脂、PMMA树脂{较l晶性树脂如聚乙烯、聚甲醛{容易生残余应力,应予以注意?/span> </p> <p> <span style="font-size:14px;">脱模推出Ӟ׃脱模斜度、模具型胶及凸模_糙Q推出力过大,产生应力Q有时甚臛_推出杆周围生白化或破裂现象。只要仔l观察龟裂生的位置Q即可确定原因?/span> </p> <p> <span style="font-size:14px;">在注成型的同时嵌入金属件时Q最Ҏ产生应力Q而且Ҏ在经q一D|间后才生龟裂,危害极大。这主要是由于金属和树脂的热膨胀pL相差悬殊产生应力Q而且随着旉的推U,应力过逐渐劣化的树脂材料的强度而生裂UVؓ预防由此产生的龟裂,作ؓl验Q壁?”与嵌入金属他的外径</span> </p> <p> <span style="font-size:14px;">通用型聚苯乙烯基本上不适于宜加镶嵌Ӟ而镶嵌g对尼龙的影响最。由于玻璃纤l增强树脂材料的热膨胀pL较小Q比较适合嵌入件?/span> </p> <p> <span style="font-size:14px;">另外Q成型前寚w属嵌件进行预热,也具有较好的效果?/span> </p> <p> <span style="font-size:14px;">大家对于塑胶玩具龟裂的原因都了解清楚了吗Q今?strong><a href="//www.vfhjc.icu/" title="qqɳ˺">qqɳ˺</a></strong>在这里就不多说了Q有需要的朋友Q欢q来电咨询下单!</span> </p> <p> <img src="//www.vfhjc.icu/uploads/news/20180117045315.jpg" width="500" height="400" title="塑胶玩具厂家" align="" alt="塑胶玩具厂家" /> </p></p> <div class="pagess"><div class="zjn">上一?<a href="70.html">塑胶玩具表面光泽度低怎么解决Q塑胶玩具厂家来教你</a></div> <div class="zjn">下一?<a href="68.html">东莞塑胶制品厂家Q塑胶制品按原料l怎么分类</a></div> </div> <div class="info_key"> <span class="zjn">相关标签Q?a href='/key.aspx?k=%e5%a1%91%e8%83%b6%e7%8e%a9%e5%85%b7%e5%8e%82%e5%ae%b6'>塑胶玩具厂家</a>,<a href='/key.aspx?k=%e4%b8%9c%e8%8e%9e%e9%a5%b0%e5%93%81%e5%8e%82%e5%ae%b6'>东莞饰品厂家</a>,<a href='/key.aspx?k=%e4%b8%9c%e8%8e%9e%e5%a1%91%e8%83%b6%e5%88%b6%e5%93%81'>东莞塑胶制品</a>,</span> </div> </div> <div class="clear"></div> </div> <div class="zklist"> <div class="zklist-T"> 相关新闻</div> <div class="zklist-C"> <ul class="zjn"> <li class="zjn"> <a href="/news/103.html" title="东莞塑胶制品的保M要分哪三? 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