Introduction: E like me kekahi o nā plastics maʻamau i hoʻohana nui ʻia, hiki ke ʻike ʻia ʻo PP ma nā wahi āpau i ke ola o kēlā me kēia lā. ʻOi aku ka maʻemaʻe ma mua o ka PC maʻamau. ʻOiai ʻaʻohe ona kala kiʻekiʻe o ABS, ʻoi aku ka maikaʻi o ka maʻemaʻe a me ka waiho ʻana o ka kala. I ka ʻoihana, hoʻohana pinepine ʻia nā mea PP i nā mea hoʻopihapiha e like menā ʻōmole plastik, nā pāpale ʻōmole, ʻōmole cream, etc. Hoʻoponopono ʻia au eRB PALAPALAa kaʻana like me ke kaulahao hoʻolako no ka ʻike:
Ka inoa kemika: Polypropylene
Ka inoa Pelekania: Polypropylene (i kapa ʻia ʻo PP)
ʻO PP kahi polymer crystalline. Ma waena o nā plastic i hoʻohana mau ʻia, ʻo PP ka māmā loa, me ka nui o 0.91g/cm3 wale nō (emi ma mua o ka wai). Ma waena o nā plastics maʻamau, ʻoi aku ka maikaʻi o ka pale ʻana i ka wela. ʻO 80-100 ° C kona wela wela a hiki ke hoʻolapalapa ʻia i ka wai paila. Loaʻa ka PP i ke koʻikoʻi koʻikoʻi i ka haki ʻana a me ke ola luhi luhi kiʻekiʻe. ʻIke ʻia ʻo ia ʻo "100% plastic". ʻOi aku ka maikaʻi o ka hana piha o ka PP ma mua o ka mea o ka mea PE. Loaʻa i nā huahana PP ke kaumaha māmā, ka paʻakikī maikaʻi a me ke kūpaʻa kemika maikaʻi.
ʻO nā hemahema o PP: ka haʻahaʻa haʻahaʻa haʻahaʻa, ʻaʻole lawa ka rigidity, ke kū ʻana o ka wā maikaʻi ʻole, maʻalahi ka hana ʻana i ka "pōʻino keleawe", loaʻa iā ia ka hanana post-shrinkage, ma hope o ka hoʻohaʻahaʻa ʻana, ua maʻalahi ka makahiki, lilo i palupalu, a maʻalahi hoʻi e deform.
01
ʻO nā hiʻohiʻona hoʻoheheʻe
1) He hygroscopicity haʻahaʻa ka mea crystalline a hiki ke hoʻoheheʻe ʻia i ka haʻihaʻi, a maʻalahi ke hoʻoheheʻe ʻia i ka pilina lōʻihi me ka metala wela.
2) He maikaʻi ka wai, akā nui ka nui o ka hoʻohaʻahaʻa a me ka waiwai hoʻohaʻahaʻa, a ua maʻalahi nā puka shrinkage, nā niho, a me nā deformation.
3) ʻO ka wikiwiki ka wikiwiki, ʻo ka ʻōnaehana ninini a me ka ʻōnaehana hoʻoluʻu e hoʻopau mālie i ka wela, a e hoʻolohe i ka mālama ʻana i ka mahana hoʻoheheʻe. He mea maʻalahi ka hoʻonohonoho ʻana o ka mea wela ma ka wela haʻahaʻa a me ke kaomi kiʻekiʻe. Ke emi ka mahana ma lalo o 50 degere, ʻaʻole maʻalahi ka ʻāpana plastik, a maʻalahi ka hana ʻana i ka wiliwili maikaʻi ʻole, nā kaha kahe, Prone i ka warping a me ka deformation ma luna o 90 degere.
4) Pono e like ka mānoanoa o ka pā palaka i mea e pale aku ai i ka nele o ke kāpili a me nā kihi ʻoi e pale ai i ke koʻikoʻi.
02
Kaʻina hana
He maikaʻi ka wai o ka PP ma ka wela hoʻoheheʻe a me ka hana hoʻoheheʻe maikaʻi. ʻElua mau hiʻohiʻona o ka PP i ka hana
Hoʻokahi: Ua emi nui ka viscosity o PP hehee me ka piʻi ʻana o ka shear rate (emi ʻia e ka wela)
ʻElua: He kiʻekiʻe ke kiʻekiʻe o ka molecular orientation a ʻoi aku ka kiʻekiʻe o ka emi ʻana.
ʻO ka mahana hana o PP ma kahi o 200-300 ℃. Loaʻa iā ia ke kūpaʻa wela maikaʻi (ʻo ka mahana decomposition he 310 ℃), akā i ka wela kiʻekiʻe (270-300 ℃), hiki ke hoʻohaʻahaʻa inā noho ia i loko o ka pahu no ka manawa lōʻihi. Ma muli o ka emi nui o ka viscosity o PP me ka piʻi ʻana o ka wikiwiki o ka shear, hoʻonui i ke kaomi injection a me ka wikiwiki o ka injection e hoʻonui i kona wai a hoʻomaikaʻi i ka deformation shrinkage a me ke kaumaha. Pono e hoʻomaluʻia ka mahana wela i loko o ka laulā o 30-50 ℃. Hiki i ka PP hehee ke hele i loko o kahi āwaha haiki loa a kū i mua. I ke kaʻina hoʻoheheʻe ʻana o PP, pono ia e komo i ka nui o ka wela o ka hui ʻana (ʻoi aku ka nui o ka wela kikoʻī), a ʻoi aku ka wela o ka huahana ma hope o ka hoʻokuʻu ʻia ʻana mai ka ʻōpala. ʻAʻole pono e hoʻomaloʻo ʻia nā mea PP i ka wā e hana ai, a ʻoi aku ka haʻahaʻa o ka shrinkage a me ka crystallinity o PP ma mua o ka PE.
03
Nā mea e hoʻomaopopo ai i ka hana ʻana i ka plastic
ʻO ka hana palaki
ʻO ka PP maʻemaʻe he keʻokeʻo ʻelepani translucent a hiki ke hoʻoluʻu ʻia i nā kala like ʻole. Hiki ke hoʻoluʻu wale ʻia ka PP me ka masterbatch kala ma nā mīkini hoʻoheheʻe maʻamau, akā aia kekahi mau hiʻohiʻona i nā mea plasticizing kūʻokoʻa e hoʻoikaika ai i ka hopena hui ʻana, a hiki ke hoʻoluʻu ʻia me ka toner.
Hoʻopiha piha ʻia nā huahana i hoʻohana ʻia ma waho me nā UV stabilizers a me ka ʻeleʻele kalapona. ʻAʻole pono e ʻoi aku ka nui o ka hoʻohana ʻana o nā mea hana hou ma mua o 15%, inā ʻaʻole e hāʻule ka ikaika a me ka decomposition a me ka discoloration. ʻO ka maʻamau, ʻaʻole pono ka hoʻomaʻemaʻe maloʻo kūikawā ma mua o ka hoʻoili ʻana o PP injection.
Koho i ka mīkini hoʻoheheʻe ʻia
ʻAʻohe koi kūikawā no ke koho ʻana i nā mīkini hoʻoheheʻe injection. No ka mea he kiʻekiʻe ka crystallinity o PP. Pono ka mīkini hoʻoheheʻe lolouila me ka ʻoi aku ke kiʻekiʻe o ke kaomi ʻana a me ka mana multi-stage. Hoʻoholo ʻia ka ikaika clamping e 3800t / m2, a ʻo ka nui o ka injection he 20% -85%.
Mold a me ka hoʻolālā puka
ʻO ka mahana wela ka 50-90 ℃, a hoʻohana ʻia ka mahana wela kiʻekiʻe no nā koi nui kiʻekiʻe. ʻOi aku ka nui o ka mahana ma mua o 5 ℃ haʻahaʻa ma mua o ka mahana o ka lua, ʻo ke anawaena o ke kukini he 4-7mm, ʻo ka lōʻihi o ka puka nila he 1-1.5mm, a ʻo ke anawaena hiki ke liʻiliʻi e like me 0.7mm.
ʻO ka lōʻihi o ka ʻīpuka lihi e like me ka pōkole, ma kahi o 0.7mm, ʻo ka hohonu ka hapalua o ka mānoanoa o ka pā, a ʻo ka laula he ʻelua ka mānoanoa o ka pā, a hoʻonui ʻia me ka lōʻihi o ke kahe hehee i loko o ka lua.
Pono ka puka makani maikaʻi. ʻO ka puka makani he 0.025mm-0.038mm ka hohonu a he 1.5mm ka mānoanoa. No ka pale ʻana i nā hōʻailona hōʻemi, e hoʻohana i nā nozzles nui a poepoe a me nā kukini pōʻai, a ʻo ka mānoanoa o nā iwi ʻaoʻao e liʻiliʻi ( No ka laʻana, 50-60% o ka mānoanoa o ka pā).
ʻAʻole pono ka mānoanoa o nā huahana i hana ʻia me ka homopolymer PP ma mua o 3mm, inā ʻaʻole e loaʻa nā bula (hiki i nā huahana pā mānoanoa ke hoʻohana i ka copolymer PP).
He wela wela
ʻO ka helu hoʻoheheʻe o PP ʻo 160-175 ° C, a ʻo ka mahana decomposition he 350 ° C, akā ʻaʻole hiki ke hoʻonohonoho ʻia ka mahana ma mua o 275 ° C i ka wā o ka hana injection. ʻOi aku ka maikaʻi o ka mahana ma ka ʻāpana heheʻe he 240°C.
ʻO ka wikiwiki o ka injection
I mea e hōʻemi ai i ke koʻikoʻi o loko a me ka deformation, pono e koho ʻia ke kiʻekiʻe-wikiwiki injection, akā ʻaʻole kūpono kekahi mau māka o ka PP a me nā mold (nā ʻōpū a me nā laina ea i ke kapa kanaka). Inā ʻike ʻia ka ʻili i hoʻohālikelike ʻia me nā kaha māmā a me ka ʻeleʻele i hoʻopuehu ʻia e ka puka, pono e hoʻohana ʻia ka hoʻokele haʻahaʻa haʻahaʻa a me ke kiʻekiʻe o ka wela.
hehee hope kaomi
Hiki ke hoʻohana ʻia ka 5bar melt adhesive back pressure, a hiki ke hoʻoponopono pono ʻia ke kaomi hope o ka mea toner.
Injection a me ka paa pu ana
E hoʻohana i ke kaomi hoʻokiʻekiʻe kiʻekiʻe (1500-1800bar) a me ka paʻa paʻa (ma kahi o 80% o ke kaomi injection). E hoʻololi i ke kaomi paʻa ma kahi o 95% o ka hahau piha, a hoʻohana i ka manawa paʻa lōʻihi.
Ma hope o ka hana ʻana o nā huahana
I mea e pale aku ai i ka emi ʻana a me ka deformation i hoʻokumu ʻia e ka post-crystallization, pono e hoʻoinu ʻia nā huahana i ka wai wela.
ʻO Shanghai Rainbow Industrial Co., Ltdʻo ia ka mea hana,pūʻolo ānuenue ShanghaiE hoʻolako i hoʻokahi-stop cosmetic packaging.Inā makemake ʻoe i kā mākou huahana, hiki iā ʻoekāhea iā mā˚ou,
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Ka manawa hoʻouna: Oct-04-2021