ʻIke pinepine ʻia ka mea PMMA me ka plexiglass, acrylic, etc. ʻO ka inoa kemika he polymethyl methacrylate. ʻO ka PMMA kahi mea ʻawaʻawa ʻole a pili i ke kaiapuni. ʻO ka hiʻohiʻona nui loa he transparency kiʻekiʻe, me ka transmittance māmā o 92%. ʻO ka mea me nā waiwai māmā maikaʻi loa, ʻo ka UV transmittance a hiki i ka 75%, a ʻo ka mea PMMA pū kekahi me ke kūpaʻa kemika maikaʻi a me ke kū ʻana i ka wā.
Hoʻohana pinepine ʻia nā mea acrylic PMMA e like me nā pepa acrylic, nā pellets plastic plastic, nā pahu kukui acrylic, nā bathtubs acrylic, a me nā mea ʻē aʻe. nā ipu), nā noi ʻoihana (nā wikiō wikiō, nā diffuser māmā) ), nā pihi o nā huahana uila (ʻoi aku ka maopopo), nā mea kūʻai aku (nā kīʻaha inu, nā mea kākau, etc.).
ʻOi aku ka maikaʻi o ka wai o ka mea PMMA ma mua o ka PS a me ABS, a ʻoi aku ka maʻalahi o ka hoʻoheheʻe ʻana i nā loli i ka mahana. I ke kaʻina hana, hoʻohana nui ʻia ka mahana injection e hoʻololi i ka viscosity melt. ʻO ka PMMA kahi polymer amorphous me kahi mahana hoʻoheheʻe ʻoi aku ma mua o 160 ℃ a me kahi mahana decomposition o 270 ℃. ʻO nā ʻano hana hoʻoheheʻe ʻana o nā mea PMMA me ka hoʻolei ʻana,hoʻoheheʻe ʻia, machining, thermoforming, etc.
1. Hoʻomaʻamaʻa i nā plastics
ʻO ka PMMA kekahi wai hoʻoheheʻe wai, a he 0.3-0.4% ka nui o ka hoʻoheheʻe ʻana o ka wai, a ʻo ka mahana o ka hoʻoheheʻe ʻia ʻana ma lalo o 0.1%, maʻamau 0.04%. ʻO ka loaʻa ʻana o ka wai e hoʻoheheʻe ʻia nā ʻōhū, nā kaha kinoea, a hōʻemi i ka ʻike. No laila pono e maloʻo. ʻO ka mahana maloʻo he 80-90 ℃, a ʻoi aku ka manawa ma mua o 3 mau hola.
I kekahi mau hihia, hiki ke hoʻohana ʻia ka 100% o nā mea hana hou. ʻO ka nui maoli e pili ana i nā koi maikaʻi. ʻO ka maʻamau, hiki ke ʻoi aku ma mua o 30%. Pono nā mea hana hou e pale i ka haumia, inā ʻaʻole ia e hoʻopilikia i ka mālamalama a me nā waiwai o ka huahana i hoʻopau ʻia.
2. Ke kohoʻana i ka mīkini hoʻoheheʻe injection
ʻAʻohe koi kūikawā o ka PMMA no nā mīkini hoʻoheheʻe injection. Ma muli o kona viscosity hoʻoheheʻe kiʻekiʻe, koi ʻia kahi ʻāwī wili hohonu a me kahi puka nozzle ʻoi aku ka nui. Inā koi ʻia ka ikaika o ka huahana e kiʻekiʻe, pono e hoʻohana ʻia kahi wili me kahi lākiō ʻoi aku ka nui no ka plasticization haʻahaʻa haʻahaʻa. Eia kekahi, pono e mālama ʻia ka PMMA i loko o kahi pahu maloʻo.
3. Mold a me ka hoʻolālā puka
Hiki i ka mahana mold-ken ke 60 ℃-80 ℃. Pono ke anawaena o ka sprue e like me ka taper o loko. ʻO ka huina maikaʻi loa he 5° a 7°. Inā makemake ʻoe e hoʻokomo i nā huahana 4mm a ʻoi aku paha, ʻo 7 ° ke kihi, a ʻo ke anawaena o ka sprue he 8 °. I ka 10mm, ʻaʻole pono ka lōʻihi o ka puka ma mua o 50mm. No nā huahana me ka mānoanoa pā ma lalo o 4mm, he 6-8mm ke anawaena o ke kukini, a no nā huahana me ka mānoanoa o ka paia ma mua o 4mm, he 8-12mm ke anawaena o ke kukini.
He 0.7 a 0.9t ka hohonu o ka puka diagonal, fan-like a me vertical-like (t ka mānoanoa o ka pā o ka huahana), a ʻo ke anawaena o ka puka nila he 0.8 a 2mm; no ka viscosity haʻahaʻa, pono e hoʻohana i kahi liʻiliʻi liʻiliʻi. ʻO nā puka makani maʻamau he 0.05 a 0.07mm ka hohonu a me ka 6mm ākea.Aia ka slope demolding ma waena o 30′-1° a me 35′-1°30° ma ka ʻāpana lua.
4. He wela wela
Hiki ke ana ʻia ma ke ʻano hoʻoheheʻe ea: mai 210 ℃ a 270 ℃, ma muli o ka ʻike i hāʻawi ʻia e ka mea hoʻolako.
5. Injection wela
Hiki ke hoʻohana ʻia ka wikiwiki wikiwiki, akā, no ka pale ʻana i ke koʻikoʻi o loko, pono e hoʻohana ʻia ka multi-stage injection, e like me ka slow-fast-slow, etc.
6. Noho manawa
Inā he 260 ℃ ka mahana, ʻaʻole pono ka manawa noho ma mua o 10 mau minuke i ka nui, a inā he 270 ℃ ka mahana, ʻaʻole pono ka manawa noho ma mua o 8 mau minuke.
Ka manawa hoʻouna: Mei-25-2022
