ʻO ka Polypropylene (PP) kahi thermoplastic "hoʻohui polymer" i hana ʻia mai ka hui pū ʻana o nā monomers propylene. Hoʻohana ʻia ia i loko o nā noi like ʻole e hoʻokomo i ka ʻeke no nā huahana mea kūʻai aku, nā ʻāpana plastik no nā ʻoihana like ʻole me ka ʻoihana automotive, nā mea hana kūikawā e like me nā hinges ola, a me nā textiles.
1. Hoʻomaʻamaʻa i nā plastics.
ʻO ka PP maʻemaʻe he ʻelepani keʻokeʻo translucent a hiki ke hoʻoluʻu ʻia i nā kala like ʻole. No ka hoʻoluʻu PP, hiki ke hoʻohana ʻia ka masterbatch kala ma ka laulāhoʻoheheʻe ʻianā mīkini. 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.
2. Ke kohoʻana i ka mīkini hoʻoheheʻe injection
No ka mea he kiʻekiʻe ka crystallinity o PP. Pono ka mīkini hoʻoheheʻe lolouila me ka piʻi kiʻekiʻe a me ka mana multi-stage. Hoʻoholo ʻia ka ikaika clamping ma 3800t / m2, a ʻo ka nui o ka injection he 20% -85%.
3. 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 laulā he pālua ka mānoanoa o ka pā, a e hoʻonui mālie 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. I mea e pale aku ai i nā hōʻailona hōʻemi, e hoʻohana i ka nozzle nui a poepoe a me ka holo poepoe, a e liʻiliʻi ka mānoanoa o nā iwi ʻaoʻao. ʻAʻole hiki i ka mānoanoa o nā huahana i hana ʻia me ka homopolymer PP ma mua o 3mm, inā ʻaʻole e loaʻa nā bula.
4. 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 o ka wahi hoʻoheheʻe he 240°C.
5. 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. 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.
6. E hoohehee i ke kaomi hope
Hiki ke hoʻohana ʻia ka 5bar melt adhesive back pressure, a hiki ke hoʻoponopono pono ʻia ke kaomi hope o ka mea toner.
7. Injection a me ka mālama puʻe
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.
8. Ma hope o ka hana ʻana i 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 hoʻoheheʻe ʻia nā huahana.d i ka wai wela.
Ka manawa hoʻouna: Feb-25-2022
