Tsarin Kumfa na EVA na Kayan Danye da Binciken Tsarin Aiki Huɗu

Tsarin Kumfa na EVA na Kayan Danye da Binciken Tsarin Aiki Huɗu
EVA, ethylene vinyl acetate copolymer, kayan polymer. Takalmin EVA mai sauƙi ne kuma yana da kyawawan halaye na zahiri, takalma ne na manya masu sauƙi, takalman wasanni, takalma na yau da kullun suna amfani da mafi yawan kayan. A yau, za mu koyi yadda ake ƙirƙirar kumfa na EVA na kayan aiki da hanyoyin guda huɗu.

A. Tsarin kumfa na EVA na waɗannan abubuwan

Tsarin kumfa na EVA gabaɗaya ya ƙunshi kayan aiki masu zuwa: babban kayan aiki, cikawa, mai kumfa, mai haɗin gwiwa, mai hanzarta kumfa, mai shafawa.

Babban kayan, wanda shine EVA ko PE. Tabbas, domin inganta halayen kayan, zaku iya ƙara wasu kayan, kamar roba, POE (polyethylene octene co-elastomer), da sauransu, amma kuma yana iya ƙara ɗan TPR (haɗin mallakar roba da thermoplastic na kayan) don ƙarfafa wasu halayen jiki.

Babban alamar EVA ita ce abun ciki na VA, babban yanke shawara da yake da shi, kusan dukkan ayyukan samfuran kumfa na EVA suna da alaƙa kai tsaye. Tabbas wasu kawai ana iya yin amfani da PE. Takamaiman abin da babban kayan ko ya dogara da buƙatun samfurin.

Ana amfani da sinadarin cikawa, wanda a halin yanzu ake amfani da shi wajen amfani da sinadarin calcium carbonate ko talcum powder. Ana amfani da shi don rage farashi, ƙara tauri na samfurin, da sauransu, amma kuma yana iya taka rawa a cikin yanayin zafi. Gabaɗaya girman barbashi a matsayin alamar inganci (ba shakka, abun da ke cikin ruwa shima wani ɓangare ne na shi), misali, raga 120, raga 400, da sauransu. A ƙa'ida, mafi kyau, mafi kyau, ba shakka, farashin zai fi girma. Matsakaicin adadin da aka samu a cikin girke-girken da na gani shine 40Phr (adadin shine kashi na babban kayan).

Wakilin kumfa, wanda galibi ana amfani da shi don amfani da jerin wakilin kumfa na AC, kamar AC-3000H, jerin wakilin kumfa na AC yana cikin wakilin kumfa mai zafi, zafin bazuwa a cikin fiye da digiri 220.

Akwai kuma maganin kumfa mai ƙarancin zafi, kamar AD-300, zafin narkewa a digiri 140, da kuma maganin kumfa mai matsakaicin zafi. Domin bambancin farashi ba shi da yawa, kuma maganin busawa mai yawan zafin jiki zai kasance mai daidaito, don haka yanzu da yawa daga cikin tsoffin EVA suna canzawa zuwa zafin jiki mai yawa, amma kuma tare da amfani da maganin AC, ya danganta da takamaiman mai ninkawa.

Maganin gadoji da aka fi amfani da shi a yanzu shine DCP (di-sec-octyl phthalate), wanda a da ake amfani da shi a baya TAIC, PL400, da sauransu. Rabin rayuwar DCP shine minti 1 a digiri 180 na Celsius da mintuna 10 a digiri 130 na Celsius, don haka gabaɗaya, lokacin yin aikin kayan, ya kamata a sarrafa zafin jiki ƙasa da digiri 120 na Celsius.

Wasu samfuran da ke buƙatar wari za su iya amfani da wani maganin haɗin gwiwa, BIPB, wanda galibi ana amfani da shi tare da TAIC. Yawan DCP shine 0.5-0.6Phr ga kumfa mai faɗi da ƙaramin kumfa a cikin mold, da kuma 0.8-1.0Phr ga kumfa mai allura, amma akwai kuma bambance-bambance a cikin amfani.

Akwai nau'ikan na'urorin haɓaka kumfa guda biyu, foda na zinc oxide da foda na zinc stearate, waɗanda ake amfani da su sosai a zamanin yau. Mun taɓa amfani da waɗannan biyun tare a nan, amma yanzu muna amfani da zinc oxide kawai. Nau'i ɗaya kuma zai iya cimma tasirin, kuma kwanciyar hankali na samfurin na iya zama mafi kyau. Zinc oxide yana rage zafin ruɓewar AC zuwa kimanin digiri 160, wanda ke sauƙaƙa samarwa. Muna da yarjejeniya a nan, yawan zinc oxide gabaɗaya bai wuce 0.2Phr ba, kuma raguwar samfura da yawa zai yi yawa. Tabbas, idan ya yi ƙasa da haka, saurin kumfa yana da jinkiri sosai, don haka ya fi kyau kada a ƙasa da 1.0hr/.

Man shafawa yawanci stearic acid ne. A zahiri, ba shi da tasiri sosai, shine a bar kayan aikin motsa jiki, ba injin mai mannewa ba. Ba shi da kyau a yi amfani da shi fiye da haka, domin yana iya rage gogayya tsakanin maki, ta yadda yawancin halayen jiki za su ragu kuma ana ba da shawarar 0.5Phr.

B. Game da Tsarin

Kumfa na EVA gabaɗaya ana amfani da shi wajen yin aiki guda huɗu, babban kumfa na gargajiya, ƙaramin kumfa a cikin mold, allura da kuma kumfa mai tsauri.

1. Tsarin allura

Wannan tsari shine babban abin da za a yi nan gaba, tsari ne da ba a yi shi ba, amma daidaiton mold ya fi girma. Ka'idar tana kama da mold ɗin masana'antar filastik, amma mold ɗin allura yana buɗe nan take, kuma zafin mold ya bambanta, wato, ana daidaita zafin mold ɗin allurar EVA da lokacin buɗe mold kaɗan. Yanzu takalman wasanni da aka sani sun canza dangane da wannan hanyar. Sauran hanyoyin fiye da ita, inganci yana da nisan mil miliyan.

2. Babban Kumfa Mai Faɗi na Gargajiya

A zamanin yau, ƙananan masana'antu galibi suna amfani da wannan nau'in, kuma farashin injuna da kayan aiki yana da ƙasa kaɗan. Ana yin wannan tsari ne da zanen gado, sannan a yi shi ta hanyar naushi, niƙa da sauransu. Yanayin kumfa yana da ɗan gyara, zafin jiki shine 160-170, lokaci yana ƙayyade ta hanyar kauri na mold, gabaɗaya daƙiƙa 90-110 / MM, matsin lamba 150KG / murabba'in CM.

3. Ƙarami a cikin mold Kumfa

Ana amfani da wannan tsari galibi a cikin kayan takalma, takalman wasanni don yin kumfa na farko na tsakiyar tafin ƙafa na biyu. Ana yin kayan bisa ga dabarar, a auna kuma a saka shi cikin buɗaɗɗen mold, kuma kumfa yana fitowa a matsayin kamannin takalmin gabaɗaya.

Wahalar wannan tsari ita ce daidaiton mold da girke-girke; in ba haka ba yana da wuya a sarrafa yawan da tauri a lokaci guda. Sau da yawa girman ya cancanta amma tauri bai isa ba, kuma tauri ya isa amma girman ya ƙanƙanta.

Yanayin kumfa na wannan tsari ya fi sassauƙa, ya danganta da tsarin siffar samfurin, ba shakka, galibi lokaci shine canjin, kuma canjin zafin jiki ba shi da yawa.

A baya, mun yi magana game da tsakiyar tafin ƙafa na biyu, kuma a nan mun gabatar da tsarin na biyu. Ana niƙa ɗan tayin da ke cikin kumfa na baya daga fata sannan a matse shi cikin tsarin da aka gama, kuma ana samar da samfurin ta hanyar dumama da sanyaya a matakai biyu.

Zafin dumama a 125-135 ya fi dacewa, matsin lamba 50KG / murabba'in CM, dumama na wani lokaci sannan ruwa ya huce, cirewa shine tafin tsakiya na biyu. Wannan matsi zuwa girman ƙasa ya fi karko, halayen jiki sun fi kyau.

4. Kumfa Mai Tsanani

Sarkar kwayoyin halitta ta EVA tana layi ne, don haka a tsarin kumfa yawanci ana buƙatar ƙara wakili mai haɗin giciye, ta hanyar tsarin haɗin giciye don kulle iskar. Saboda haka, kumfa mai ƙarfi na EVA zai buƙaci magance matsalar yadda ake kulle iskar.

Daga wallafe-wallafen haƙƙin mallaka da wasu bayanai na kamfanoni, tsarin kumfa mai ƙarfi na EVA a zahiri hanya ce irin wannan: haɗa abubuwa masu yawa bayan haɗin gwiwa, yin amfani da granulation, yin gyare-gyare don samun tafin da aka riga aka yi wa vulcanized, tafin ƙafa zuwa na'urar kumfa ta autoclave, wakilin kumfa na zahiri a cikin kettle, ta amfani da hanyar rage matsin lamba don samun kayan tafin ƙafa na microporous.

Canje-canje a cikin yanayin kayan EVA: granulation - allura / ƙera allura - kumfa - tafin ƙafa.

Irin wannan tsarin kumfa za a iya fahimtarsa ​​kawai a matsayin tsarin ƙera kumfa, sinadarin busawa zuwa sinadarin busawa na zahiri, tare da aikin rage matsin lamba cikin sauri, za ku iya samun tafin EVA mai ƙarfi. Idan kuna son dukkan tsarin ya kasance mai tsabta da kuma tsabtace muhalli, za a iya maye gurbin tsarin haɗin giciye na baya da hanyar haɗin sinadarai kamar haɗin giciye na radiation.

An haɓaka tsarin kumfa mai ƙarfi a cikin shekaru biyu da suka gabata, kayan aiki, fasaha sun kasance cikakke, wanda ke daidaita tsarin, tsari, don haka kyakkyawan aiki da kuma rage raguwar farashi shine mabuɗin.