Yini okufanele uyenze uma ikhwalithi yezilawuli ze-PVC foaming imbi?

Ngesikhathi senqubo yokugqwala kwezinto, igesi eboliswa yi-ejenti egqwala yakha amabhamuza ekuncibilikeni. Kukhona umkhuba wamabhamuza amancane akhula aye kumabhamuza amakhulu kulawa mabhamuza. Ubukhulu kanye nenani lamabhamuza akuhlobene nje kuphela nenani le-ejenti egqwala engeziwe, kodwa futhi namandla okugqwala kwe-polymer. Uma ukuqina kuphansi kakhulu, igesi ingaphuma kalula lapho isakazeka ebusweni bokugqwala, futhi amabhamuza amancane ahlangana ukuze akhe amabhamuza amakhulu. Amaketanga amade ama-molecule abalawuli be-foam ayabanjwa futhi anamathele kumaketanga ama-molecule e-PVC, akha isakhiwo esithile senethiwekhi. Ngakolunye uhlangothi, kukhuthaza ukwenziwa kwepulasitiki kwezinto, kanti ngakolunye uhlangothi, kuthuthukisa amandla okugqwala kwe-PVC, ukuze udonga lweseli le-foam lukwazi ukumelana nengcindezi yegesi ngaphakathi kweseli le-foam ngesikhathi senqubo yokugqwala, ukuze lungaqhekeki ngenxa yamandla anganele. Abalawuli be-foam bangenza ama-pores omkhiqizo abe mancane futhi abe maningi, ngesakhiwo se-pore esifanayo nesinengqondo, okunciphisa kakhulu ubuningi bomzimba we-foam. Ikhwalithi ephansi noma umthamo onganele wabalawuli be-foam kungaholela emandleni aphansi e-foam, okuholela ekuqhumeni noma kuma-string bubbles.

Isisindo sama-molecule kanye nokuqina kwe-foam regulators ezikhiqizwa abakhiqizi abahlukene kuyahlukahluka kakhulu. Lapho imikhiqizo ye-foam iphula noma ihlanganisa ama-bubble, kanye nezinye izindlela zingasebenzi, ukufaka esikhundleni se-foam regulator noma ukwandisa umthamo ngokufanele ngokuvamile kungaveza imiphumela ebalulekile. Kodwa-ke, ukwengeza noma ukufaka esikhundleni se-foam regulators ngesisindo sama-molecule aphezulu kungandisa ubuningi bomkhiqizo ngenxa ye-viscosity eyeqile, okuvimbela ukwanda kwama-bubbles ekuncibilikeni. Futhi ngenxa ye-viscosity ephezulu ye-melt, uketshezi luzowohloka, okuholela ekukhishweni okungalingani kwe-mold, okuthinta ukuthamba kwendawo yepuleti, ngisho nesikhathi esifushane sokukhiqiza, okuholela ekwehlulekeni kwe-mold paste, ikakhulukazi lapho kukhiqizwa amapuleti anobukhulu obungaphansi kuka-10mm.