Extrusion na TPU (Thermoplastic Polyurethane)

1. Shirye-shiryen Kayan aiki

• TPUZabin Pellets: ZaɓiFarashin TPUtare da taurin da ya dace (taurin bakin teku, yawanci jere daga 50A - 90D), ma'aunin narkewar ruwa (MFI), da halayen aiki (misali, juriya mai girma, elasticity, da juriya na sinadarai) bisa ga buƙatun samfurin ƙarshe.
• bushewa:TPUshi ne hygroscopic, don haka dole ne a pre-bushe kafin extrusion don cire danshi. Danshi na iya haifar da kumfa, lahani na sama, da rage kayan inji a cikin samfuran da aka fitar. Ana yin bushewa yawanci a zafin jiki tsakanin 80 - 100 ° C na 3 - 6 hours.

2. Tsarin Extrusion

• Abubuwan Extruder
  • Ganga: Ganga na extruder yana mai zafi a yankuna da yawa don narkar da pellet ɗin TPU a hankali. An saita bayanin zafin jiki a hankali don tabbatar da narkewa mai kyau ba tare da wuce gona da iri ba - dumama kayan, wanda zai haifar da lalacewa. Misali, yankin ciyarwar zai iya zama a kusa da 160 – 180C, yankin matsawa a kusa da 180 – 200°C, da kuma yankin metering a kusa da 200 – 220°C, amma waɗannan dabi’u na iya bambanta dangane da darajar TPU.
  • Screw: Screw yana jujjuya cikin ganga, isarwa, matsawa, da narkewaFarashin TPU.Daban-daban ƙira na dunƙule (misali, guda - dunƙule ko tagwaye - dunƙule extruders) na iya shafar hadawa, narkewa yadda ya dace, da kuma fitarwa kudi na extrusion tsari. Twin - dunƙule extruders gabaɗaya suna ba da ingantacciyar haɗuwa da ƙarin narkewa iri ɗaya, musamman don hadadden tsari.
• Narkewa da Haɗuwa: Yayin da pellet ɗin TPU ke motsawa ta cikin ganga, sannu a hankali suna narkewa ta hanyar haɗuwa da zafi daga ganga da juzu'in da juyawar dunƙule ke haifarwa. Narkakkar TPU an gauraye shi sosai don tabbatar da narke iri ɗaya.
• Mutu Zane da Siffatawa: Ana tilastawa TPU da aka narkar da shi ta hanyar mutuwa, wanda ke ƙayyade giciye - siffar sashe na samfurin da aka fitar. Za a iya keɓance mutuƙar don samar da siffofi daban-daban, kamar zagaye don bututu, rectangular don bayanan martaba, ko lebur don zanen gado da fina-finai. Bayan wucewa ta cikin mutuwa, TPU extruded yana sanyaya kuma yana ƙarfafawa, yawanci ta hanyar wucewa ta cikin wanka na ruwa ko amfani da sanyaya iska.

3. Buga - Gudanarwa

• Daidaitawa da Girma: Don wasu samfuran da aka fitar, ana buƙatar daidaitawa da ayyukan ƙima don tabbatar da ingantattun ƙima. Wannan na iya haɗawa da amfani da hannun riga, tankuna masu ƙima, ko wasu na'urori don sarrafa diamita na waje, kauri, ko wasu ma'auni masu mahimmanci na samfurin.
• Yanke ko iska: Dangane da aikace-aikacen, samfurin TPU da aka fitar ana yanke shi cikin takamaiman tsayi (don bayanan martaba, bututu, da sauransu) ko rauni akan rolls (don zanen gado da fina-finai).