Lokacin da ake samar da kayayyakin polycarbonate na PC, me ya kamata a kula da shi?#PC#Extrusion na PC# Kayan PC

Busar da kayan da aka sarrafa

Ma filastik na PC, ko da lokacin da suka fuskanci ƙarancin danshi, za a haɗa su da ruwa don karya haɗin gwiwa, rage nauyin kwayoyin halitta da rage ƙarfin jiki. Saboda haka, kafin a yi ƙera, ya kamata a sarrafa yawan ruwan polycarbonate a ƙasa da kashi 0.02%, don guje wa raguwar ƙarfin injina na samfurin da aka ƙera ko kuma rashin kyawun bayyanar kumfa da ratsin azurfa a saman.
PC yana da matuƙar saurin kamuwa da ruwa, don haka dole ne a busar da shi gaba ɗaya kafin a yi masa allurar don rage yawan ruwan da ke cikinsa zuwa ƙasa da 0.02%. Yanayin bushewar PC gabaɗaya: 100 ~ 120°C, aƙalla awanni 4;

Zafin jiki na allura

Zafin allurar dole ne ya yi la'akari da siffar, girman da tsarin mold na samfurin. Ana iya yin sa ne kawai bayan an yi la'akari da aikin samfurin, buƙatunsa da sauran fannoni.

Gabaɗaya, zafin da ake amfani da shi wajen ƙera yana tsakanin 270 zuwa 320°C. Idan zafin kayan ya yi yawa, idan ya wuce 340°C, PC zai ruɓe, launin samfurin zai yi duhu, kuma lahani kamar zare na azurfa, ratsi masu duhu, tabo baƙi, da kumfa za su bayyana a saman. , kuma halayen jiki da na inji suma suna raguwa sosai.

PC kuma yana da matukar saurin kamuwa da zafin jiki. Danko na narkewa yana raguwa sosai tare da karuwar zafin jiki. Zafin ganga yana da 250~320°C (zai fi kyau kada ya wuce 350°C). Ƙara zafin jikin ganga yadda ya kamata yana da kyau ga plasticization na PC. Idan ya cancanta, rage damuwa a cikin tanda, zafin tanda 125~135°C, lokaci awanni 2, sanyaya ta halitta zuwa zafin ɗaki.

Injin matsa lamba

Yana da wani tasiri kan halayen jiki da na injiniya na samfuran PC, damuwa ta ciki, raguwar ƙira, da sauransu, kuma yana da tasiri mafi girma akan bayyanar da rushewar samfurin. Matsin allura mai ƙasa ko mai yawa zai haifar da wasu lahani a cikin samfurin. Ana sarrafa matsin lamba na allura tsakanin 80-120MPa. Ga samfuran da ke da siraran bango, dogayen tsari, siffofi masu rikitarwa da ƙananan ƙofofi, matsin lamba mafi girma na allura (120 -145MPa). Don haka ana samun cikakken samfuri mai santsi.

Ana buƙatar ƙarancin ruwa, allurar matsin lamba mai yawa, amma ya zama dole a yi la'akari da ragowar matsin lamba na ciki na ɓangaren filastik (na iya haifar da fashewa), saurin allura: matsakaicin gudu don kauri bango, babban gudu don bango mai siriri.

Riƙewa da Lokacin Riƙewa

Girman matsin lamba na riƙewa da tsawon lokacin riƙewa suna da babban tasiri ga matsin lamba na ciki na Samfurin PCYana da sauƙi a haifar da babban damuwa a cikin baki. A zahirin aikin, sau da yawa ana magance shi ta hanyar amfani da yanayin zafi mai yawa da kuma hanyar riƙewa mai ƙarancin matsi.

Zaɓin lokacin riƙewa ya kamata ya dogara da kauri na samfurin, girman ƙofa, zafin mold, da sauransu. Gabaɗaya, ƙanana da siriri ba sa buƙatar dogon lokacin riƙewa, akasin haka, lokacin riƙewa ga manyan kayayyaki masu kauri ya kamata ya fi tsayi. Ana iya tantance tsawon lokacin riƙewa ta hanyar gwada lokacin rufe ƙofar.

Gudun allura

Ba shi da wani tasiri a bayyane ga aikin samfuran PC. Banda ƙananan ƙofofi masu sirara, ramuka masu zurfi, da samfuran da ke gudana mai tsawo, galibi ana amfani da sarrafa matsakaici ko jinkirin sauri, mafi kyau allurar matakai da yawa, kuma galibi ana amfani da hanyar allurar matakai da yawa.

Mold zafin jiki

Kula da zafin jiki na mold: 85~120°C, gabaɗaya ana sarrafa shi a 80-100°C, ga samfuran da ke da siffofi masu rikitarwa, sirara, da buƙatu mafi girma, ana iya ƙara shi zuwa 100-120°C, amma bai kamata ya wuce zafin canjin zafi na mold ba. Zafin mold yana da yawa don rage bambanci tsakanin zafin mold da zafin kayan PC, wanda zai iya rage damuwa ta ciki na ɓangaren.

Gudun sukurori da matsin lamba na baya

Saboda yawan danko na narkewar PC, yana da amfani wajen yin robobi, fitar da hayaki, da kuma kula da injin filastik, kuma yana hana sukurori ya cika. Ana ba da shawarar a sarrafa matsin lamba na baya tsakanin kashi 10-15% na matsin lamba na allura. 

Amfani da ƙarin abubuwa

A tsarin yin allurar PC, ya kamata a yi taka tsantsan wajen amfani da maganin sakin jiki. A lokaci guda, kada a yi amfani da kayan da aka sake yin amfani da su sau uku, kuma ya kamata a yi amfani da su kusan kashi 20%.

Tsarin allurar PC yana da buƙatu mafi girma ga molds:

1) Tsara hanyar kwarara mai kauri da gajere gwargwadon iyawa, tare da ƙarancin lanƙwasawa, sannan a yi amfani da masu gudu masu zagaye da kuma niƙa da gogewa don rage juriyar kwararar narkewa.
2) Ƙofar allurar za ta iya ɗaukar kowace irin ƙofa, amma diamita na shigar ruwa bai kamata ya zama ƙasa da 1.5mm ba.

Bukatun da ake buƙata don injunan filastik waɗanda ke samar da samfuran PC:

Ana buƙatar cewa matsakaicin adadin allurar samfurin (gami da masu gudu, ƙofofi, da sauransu) bai kamata ya wuce kashi 70-80% na adadin allurar da aka saba ba;

Matsi mai matsewa: tan 0.47 zuwa 0.78 a kowace murabba'in santimita na yankin da aka yi hasashen samfurin da aka gama (ko tan 3 zuwa 5 a kowace murabba'in inch);

Girman injin: Nauyin samfurin da aka gama shine kusan kashi 40 zuwa 60% na ƙarfin injin ƙera allura. Misali, idan ƙarfin injin ya bayyana a cikin polystyrene (ounces), yana buƙatar rage shi da kashi 10%. Oza 1 = gram 28.3.

Sukuri: Tsawon sukurin ya kamata ya zama aƙalla diamita 15, kuma L/D ɗinsa shine 20:1. Ya kamata rabon matsi ya kasance tsakanin 1.5:1 zuwa 30:1. Bawul ɗin tsayawa a ƙarshen gaban sukurin ya kamata ya zama nau'in zobe mai zamiya, kuma gibin kwararar resin ya kamata ya zama aƙalla 3.2MM.