Labarai

A cikin 'yan shekarun nan, akwai Multi-screw extruder tsarin da aka kafa a kasuwa a matsayin madadin Single - dunƙule extruders tare da pre-bushewa tsarin. (A nan muna kiran tsarin extrudering da yawa ciki har da Twin-screw extruders, Planetary roller extruders da dai sauransu)

Amma muna ganin ya zama dole don samun tsarin bushewa ko da kuna amfani da extruder mai yawa. Domin:

1) Multi-screw extruders abin da suke da shi ne sosai hadaddun vacuum-degassing tsarin shigar a kan extruder don hana wani hydrolysis sakamako daga faruwa saboda wani pre-bushe tsari da aka shigar. Yawancin lokaci irin wannan nau'in extruder ya bambanta ta amfani da yanayin:

Matsakaicin damshin abinci da aka yarda kada ya zama sama da 3000 ppm (0.3%)

A gaskiya ma, kwalabe na kwalba suna nuna bambance-bambance a cikin tsabta, girman barbashi, rarraba girman barbashi da kauri - kuma musamman a cikin zafi. Flakes na bayan-mabukaci yana ba da damar riƙe har zuwa kusan 5,000 ppm na zafi a cikin samfurin da kuma adana sau da yawa wannan adadin ruwa a saman sa. A wasu ƙasashe, damshin abinci na iya kaiwa zuwa 14,000 ppm har ma da cushe a cikin Babban Bag.

Dukansu cikakken matakin abun ciki na ruwa da bambance-bambancensa, waɗanda ba za a iya kaucewa ba, su ne ainihin ƙalubalen da ke tattare da tsattsauran ra'ayi mai yawa da ra'ayi mai alaƙa. Wannan ya aikata akai-akai yana haifar da sauye-sauye na tsari, waɗanda ake iya ganewa daga matsanancin matsananciyar fitarwa na extruder.Yana yiwuwa mai yawa yawan danshi har yanzu ya kasance yayin da yake kaiwa lokacin narkewa a cikin extruder saboda matakin danshi na farko a cikin guduro, da adadin da aka cire a lokacin injin

2) PET yana da hygroscopic sosai kuma yana ɗaukar danshi daga yanayin. Ƙananan adadin danshi zai sanya PET ruwa a cikin lokacin narkewa, rage nauyin kwayoyin halitta. PET dole ne ya bushe kafin sarrafawa, kuma PET amorphous yana buƙatar crystallizing kafin bushewa don kada barbashi su manne tare yayin da suke tafiya ko da yake canjin gilashi.

Hydrolysis na iya faruwa saboda danshi kuma ana iya ganin wannan sau da yawa azaman raguwa a cikin IV (Intrinsic Viscosity) na samfurin. PET shine "Semi-crystalline". Lokacin da aka rage IV, kwalabe sun fi raguwa kuma suna da kasawa a "ƙofa" (maganin allura) yayin busawa da cikawa.

A cikin yanayin "crystalline" yana da sassan crystalline da amorphous a cikin tsarin kwayoyin halitta. Sashin crystalline yana tasowa inda kwayoyin halitta zasu iya daidaita kansu a cikin tsari mai madaidaici. A cikin yankunan da ba na crystalline kwayoyin suna cikin tsari bazuwar. Ta hanyar tabbatar da cewa crystallinity ɗinku yana da girma, kafin sarrafawa, sakamakon zai zama mafi daidaituwa da samfurin inganci.

ODE Made IRD Infrared Rotary Drum Systems sun yi waɗannan ƙananan ayyuka ta hanyar da ta fi ƙarfin kuzari. Ƙirar gajeriyar igiyar igiyar ruwa ta musamman tana motsa yanayin zafi na ƙwayoyin cuta a cikin busassun busassun abu kai tsaye ba tare da ɗaukar matakin matsakaicin matsakaici na amfani da iska mai zafi ba. Irin wannan hanyar dumama a lokacin zafi da bushewa an rage zuwa kewayon kawai 8.5 har zuwa mintuna 20 dangane da takamaiman aikace-aikacen, yayin da yawancin sa'o'i dole ne a lissafta don tsarin iska mai zafi ko bushewa na al'ada.

Infrared bushewa iya muhimmanci inganta yi na wani tagwaye-dunƙule extruder saboda yana rage lalata da IV dabi'u da muhimmanci inganta kwanciyar hankali na dukan tsari.