成都塑料管帽的安裝步驟塑(su)(su)(su)(su)料(liao)管(guan)(guan)帽和(he)(he)塑(su)(su)(su)(su)料(liao)護帽成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)選擇主要(yao)決定于塑(su)(su)(su)(su)料(liao)的(de)(de)(de)(de)類型(xing)(xing)(xing)(xing)(xing)，是(shi)(shi)熱(re)(re)塑(su)(su)(su)(su)性(xing)(xing)(xing)還(huan)是(shi)(shi)熱(re)(re)固(gu)性(xing)(xing)(xing)，起始形(xing)態以(yi)及制品的(de)(de)(de)(de)外形(xing)和(he)(he)尺寸。加(jia)工(gong)(gong)熱(re)(re)塑(su)(su)(su)(su)性(xing)(xing)(xing)塑(su)(su)(su)(su)料(liao)常用(yong)的(de)(de)(de)(de)有(you)擠(ji)出、注(zhu)(zhu)(zhu)射成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)(xing)(xing)、壓(ya)延、吹塑(su)(su)(su)(su)和(he)(he)熱(re)(re)成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)(xing)(xing)等，加(jia)工(gong)(gong)熱(re)(re)固(gu)性(xing)(xing)(xing)塑(su)(su)(su)(su)料(liao)一般采(cai)用(yong)模(mo)(mo)壓(ya)、傳遞模(mo)(mo)塑(su)(su)(su)(su)，也(ye)(ye)用(yong)注(zhu)(zhu)(zhu)射成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)(xing)(xing)。塑(su)(su)(su)(su)料(liao)成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)(xing)(xing)是(shi)(shi)將各(ge)(ge)種(zhong)形(xing)態(粉(fen)料(liao)、粒(li)料(liao)、溶液和(he)(he)分(fen)散體)的(de)(de)(de)(de)塑(su)(su)(su)(su)料(liao)制成(cheng)(cheng)(cheng)(cheng)所需(xu)形(xing)狀的(de)(de)(de)(de)制品或(huo)(huo)坯件(jian)的(de)(de)(de)(de)。成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)多(duo)達三(san)十幾(ji)(ji)種(zhong)。層壓(ya)、模(mo)(mo)壓(ya)和(he)(he)熱(re)(re)成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)(xing)(xing)是(shi)(shi)使(shi)(shi)塑(su)(su)(su)(su)料(liao)在(zai)(zai)平面上(shang)成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)(xing)(xing)。上(shang)述塑(su)(su)(su)(su)料(liao)加(jia)工(gong)(gong)的(de)(de)(de)(de)，均可用(yong)于橡膠加(jia)工(gong)(gong)。此(ci)外，還(huan)有(you)以(yi)液態單體或(huo)(huo)聚合物(wu)為(wei)(wei)原料(liao)的(de)(de)(de)(de)澆鑄等。在(zai)(zai)這(zhe)些(xie)中，以(yi)擠(ji)出和(he)(he)注(zhu)(zhu)(zhu)射成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)(xing)(xing)用(yong)得多(duo)，也(ye)(ye)是(shi)(shi)基本的(de)(de)(de)(de)成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)(xing)(xing)。 塑(su)(su)(su)(su)料(liao)管(guan)(guan)帽成(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)(xing)(xing)要(yao)注(zhu)(zhu)(zhu)意(yi)以(yi)下幾(ji)(ji)個方(fang)面： (1)塑(su)(su)(su)(su)件(jian)的(de)(de)(de)(de)線尺寸收(shou)縮(suo)(suo)(suo)由于冷(leng)縮(suo)(suo)(suo)，塑(su)(su)(su)(su)件(jian)脫模(mo)(mo)時的(de)(de)(de)(de)彈(dan)性(xing)(xing)(xing)恢復(fu)、塑(su)(su)(su)(su)性(xing)(xing)(xing)變(bian)形(xing)等原因(yin)(yin)塑(su)(su)(su)(su)件(jian)脫模(mo)(mo)冷(leng)卻到(dao)室(shi)溫后(hou)其(qi)(qi)尺寸縮(suo)(suo)(suo)小，為(wei)(wei)此(ci)型(xing)(xing)(xing)(xing)(xing)腔設(she)計(ji)時必(bi)須考慮予以(yi)補償。 (2)收(shou)縮(suo)(suo)(suo)方(fang)向(xiang)性(xing)(xing)(xing)成(cheng)(cheng)(cheng)(cheng)形(xing)時分(fen)子按方(fang)向(xiang)排列，使(shi)(shi)塑(su)(su)(su)(su)件(jian)呈現(xian)各(ge)(ge)向(xiang)，沿料(liao)流(liu)方(fang)向(xiang)(即(ji)平行方(fang)向(xiang))則收(shou)縮(suo)(suo)(suo)大(da)、強度(du)高，與料(liao)流(liu)直角方(fang)向(xiang)(即(ji)垂直方(fang)向(xiang))則收(shou)縮(suo)(suo)(suo)小、強度(du)低。另(ling)外，成(cheng)(cheng)(cheng)(cheng)形(xing)時由于塑(su)(su)(su)(su)件(jian)各(ge)(ge)部位密度(du)及填料(liao)分(fen)布不勻(yun)，故使(shi)(shi)收(shou)縮(suo)(suo)(suo)也(ye)(ye)不勻(yun)。產生(sheng)收(shou)縮(suo)(suo)(suo)差使(shi)(shi)塑(su)(su)(su)(su)件(jian)易發生(sheng)翹(qiao)曲、變(bian)形(xing)、裂紋，尤其(qi)(qi)在(zai)(zai)擠(ji)塑(su)(su)(su)(su)及注(zhu)(zhu)(zhu)射成(cheng)(cheng)(cheng)(cheng)形(xing)時則方(fang)向(xiang)性(xing)(xing)(xing)更為(wei)(wei)明顯。因(yin)(yin)此(ci)，模(mo)(mo)具設(she)計(ji)時應考慮收(shou)縮(suo)(suo)(suo)方(fang)向(xiang)性(xing)(xing)(xing)按塑(su)(su)(su)(su)件(jian)形(xing)狀、流(liu)料(liao)方(fang)向(xiang)選取收(shou)縮(suo)(suo)(suo)率為(wei)(wei)宜。成都塑料管帽的安裝步驟

　　(3)后(hou)收(shou)縮塑(su)件(jian)成(cheng)(cheng)形(xing)時(shi)，由(you)(you)于受(shou)成(cheng)(cheng)形(xing)壓力(li)(li)、剪切應力(li)(li)、各向、密度不勻(yun)(yun)、填料(liao)分(fen)布不勻(yun)(yun)、模(mo)溫不勻(yun)(yun)、硬(ying)化不勻(yun)(yun)、塑(su)性變(bian)形(xing)等因素的(de)影(ying)響，引(yin)起一系列應力(li)(li)的(de)作用，在粘流態(tai)時(shi)不能全部消失，故塑(su)件(jian)在應力(li)(li)狀態(tai)下成(cheng)(cheng)形(xing)時(shi)存在殘余(yu)應力(li)(li)。當(dang)脫模(mo)后(hou)由(you)(you)于應力(li)(li)趨向平衡(heng)及貯存條件(jian)的(de)影(ying)響，使殘余(yu)應力(li)(li)發(fa)生變(bian)化而使塑(su)件(jian)發(fa)生再收(shou)縮稱為(wei)后(hou)收(shou)縮。一般塑(su)件(jian)在脫模(mo)后(hou)10小時(shi)內變(bian)化，24小時(shi)后(hou)基本定型(xing)，但要經30-60天。鋼管上用的(de)塑(su)料(liao)管帽(mao)和塑(su)料(liao)護帽(mao)通常(chang)熱(re)塑(su)性塑(su)料(liao)的(de)后(hou)收(shou)縮比熱(re)固性大，擠塑(su)及注射成(cheng)(cheng)形(xing)的(de)比壓塑(su)成(cheng)(cheng)形(xing)的(de)大。