ʻO ke ʻano hana no ka PTFE ma ke kaomi ʻana

ʻO ka helu hoʻoheheʻe crystallization o PTFE he 327 ℃, akā ʻaʻole hiki ke resin i ka moku hoʻoheheʻe a hiki i luna o 380 ℃, a ʻoi aku ka kiʻekiʻe o ka melt viscosity e like me 1 010 Pa * S.Eia kekahi, he ikaika ko ka PTFE.No laila, ʻaʻole hiki iā ia ke hoʻoheheʻe i ke ʻano hana, ʻaʻole hiki ke hoʻoheheʻe ʻia ke ʻano hana, ʻo ka mea maʻamau ka hana ʻana o kāna mau huahana e like me ka metala a me ka hana seramika - ka laʻana, ka pauka mua, a laila sintering a me ka hana mechanical, a i ʻole ma o ka extrusion molding, isotactic pressing. ka hoʻoheheʻe ʻana, ka hoʻoheheʻe ʻana a me ka hoʻoheheʻe ʻana i ka calender a me nā ʻano hana ʻē aʻe.

ʻO ka helu hoʻoheheʻe crystallization o PTFE he 327 ℃, akā ʻaʻole hiki ke resin i ka moku hoʻoheheʻe a hiki i luna o 380 ℃, a ʻoi aku ka kiʻekiʻe o ka melt viscosity e like me 1 010 Pa * S.Eia kekahi, he ikaika ko ka PTFE.No laila, ʻaʻole hiki iā ia ke hoʻoheheʻe i ke ʻano hana, ʻaʻole hiki ke hoʻoheheʻe ʻia ke ʻano hana, ʻo ka mea maʻamau ka hana ʻana o kāna mau huahana e like me ka metala a me ka hana seramika - ka laʻana, ka pauka mua, a laila sintering a me ka hana mechanical, a i ʻole ma o ka extrusion molding, isotactic pressing. ka hoʻoheheʻe ʻana, ka hoʻoheheʻe ʻana a me ka hoʻoheheʻe ʻana i ka calender a me nā ʻano hana ʻē aʻe.

1. Hoolele

ʻO ka hoʻoheheʻe ʻana i kēia manawa ke ʻano hana hoʻoheheʻe nui loa no PTFE.ʻenehana kalaihe mau mea hoʻoheheʻe ʻia (ka pauka, granule, fibrous material, etc.) i loko o ka mold metala, ma – - wela paʻa, kaomi – - he ʻano hana.ʻAʻole kaupalena ʻia nā polymers i hoʻoheheʻe ʻia e ko lākou kaumaha molekala, a aneane hiki ke hoʻoheheʻe ʻia nā plastik āpau.ʻO nā hiʻohiʻona nui o ka molding;ʻO ke kumu kūʻai haʻahaʻa, nā mea hana maʻalahi, haʻahaʻa haʻahaʻa, ʻaʻole i kaupalena ʻia e ke kaumaha molekala o nā plastics i hana ʻia;ʻO nā hemahema ka haʻahaʻa hana pono, kiʻekiʻe o ka hana a me ka maikaʻi ʻole o ka huahana.ʻO ka PTFE he kiʻekiʻe molekala kaumaha a ʻilihune loa ka wai.Inā ʻaʻole i oʻo nā ʻano hana ʻē aʻe, ua hana nui ʻia nā huahana PTFE e ka hoʻoheheʻe ʻana ma ka honua holoʻokoʻa.

Hiki ke hoʻokaʻawale ʻia i loko o ʻelima mau ʻano e like me ka ʻokoʻa o ke kaʻina hana kikoʻī: (1) kaomi - hoʻopaʻa ʻana i kahi ala kaomi (ʻike pū ʻia ʻo ke ʻano manuahi manuahi); (2) sintering - kaomi ʻana; ʻano hana;(5) kaomi like ʻana a me ke ʻano sintering.

2. Hydroform ala

ʻO ke ala kaomi hydraulic, ʻike ʻia hoʻi ʻo ke ʻano equalization, isobaric pressure method or rubber molding method, ʻo ia ka hoʻohui ʻana i ka resin PTFE ma waena o ka ʻeke a me ka pā mold, a laila i ka ʻeke i loko o ka wai (wai hoʻohana mau ʻia), ke kaomi o ka wai. ʻeke kīpē i ka hoʻonui ʻia o ka pā mold, hoʻopaʻa i ka resin a lilo i huahana preformed - he ʻano hana.Hiki ke hoʻohana ʻia kēia ʻano hana no ka hana ʻana i ka lima nui, ka pahu mālama lalo, ka pūpū hemispheric, ke kolamu hale kiaʻi, ka papa nui, a me nā mea ʻē aʻe, a me nā huahana paʻakikī me ka PTFE composite structure, e like me ka tee, kuʻekuʻe a me ka profile.ʻO nā mea maikaʻi nui o ka hoʻoheheʻe hydraulic ʻo ia ke ʻano maʻalahi o nā mea hana a me ka mold - hoʻololi ka pauma wai maʻamau i ka paʻi kiʻekiʻe-tonnage, a ua hoʻopili ʻia nā huahana me ka paʻa a me ka paʻa - ka hopena i ka hana ʻana i nā ʻāpana nui, nā ʻano paʻakikī a me nā ʻano lining maʻalahi. .

3. Hoʻoheheʻe ʻia

Ua ʻike ʻia ke kaomi ʻana e like me ka hoʻopili ʻana i ka extrusion molding, 20-30 mesh sieve o ka disperse resin a me nā mea hoʻohui organik (toluene, petroleum ether, solvent oil, ratio o ke kaumaha resin o 1/5) i hui ʻia i loko o kahi paʻi, prepress i loko o ka pā mānoanoa cylindrical blank , a laila e hoʻokomo i loko o ka pahu mīkini paʻi paʻi, ma lalo o ka hoʻomehana ʻana me ka plunker push molding.Ma hope o ka hoʻomaloʻo ʻana a me ka sintering i ka mahana o 360 ~ 380 ° C, ʻoi aku ka ikaika a me ka paʻakikī a me ka pahu kaomi a me nā huahana bar ma hope o ka hoʻoilo.Ua kaupalena ʻia nā huahana hoʻokuke a paʻi i ke koʻokoʻo me ke anawaena o 16mm a i ʻole ka liʻiliʻi a me ka paipu me ka mānoanoa pā o 3mm a i ʻole.

4. Spiral extrusion molding

ʻOkoʻa ka extruder screw o ka pauka PTFE mai ka extruder i hoʻohana ʻia e nā plastic thermoplastic ʻē aʻe.ʻO ka hoʻoheheʻe ʻia ʻana o nā plastic thermoplastic maʻamau e hoʻokuʻu i ka mea i mua me ke kōkua o ka hoʻololi ʻana i ka screw, a ʻo ia hoʻi e hoʻopaʻa, ʻako a hui pū i nā mea.Hoʻoheheʻe ʻia ka mea i ka wela i hana ʻia e ka ikaika shear a me ka hoʻomehana waho o ka cylinder material.Eia naʻe, ʻo ka wili o ka PTFE extruder wale nō ke pāʻani i ke kuleana o ka lawe ʻana a me ka hoʻokuke ʻana, no laila e hele ka mea i ke poʻo o kahi extruder hoʻokahi-screw me ka pae poʻo pālua a me ka pitch like a me ka hohonu, a laila komo i loko o ka mold waha no ka. sintering a me ka hoʻoluʻu ʻana, a me nā ʻano me ke kaomi i hāʻawi ʻia e ka mea paʻi counter-pressure e hoʻokō i ke kumu hoʻomau.He mea paʻakikī ke hana i ka PTFE me ka extruder screw hoʻokahi.ʻO ka haʻahaʻa haʻahaʻa haʻahaʻa o ka pauka PTFE ke kumu i ka skidding i ka wā o ka hānai ʻana, ka mea e hōʻemi nui ai i ka hiki ke lawe ʻia o ka screw.A ma muli o ke kuʻi ʻana o ka wela, hiki ke hoʻopili ʻia ka pauka i ka wili a i ʻole ka barela, e ʻoi aku ka paʻakikī o ka hānai ʻana.

I kēia mau makahiki i hala iho nei, ua hoʻohana pū ʻia ka twin-screw i ka hana ʻana i nā mea hana o kēia ʻano kūikawā.He ʻokoʻa kona kumu hānai mai ka mea hoʻokahi-screw extruder, a he hana kaʻa kaʻa maikaʻi, hiki ke lanakila i ka pilikia sliding o ka pauka UHMWPE i loko o ka wili a hoʻomaikaʻi maikaʻi i ka hiki ke hānai ʻia.ʻOi aku ka maikaʻi o ka hui ʻana a me ka hopena homogenization ka counter-rotating twin-screw extruder ma mua o ka extruder twin-screw extruder, akā ma muli o kona ikaika kaʻawale nui, ʻoi aku ka nui o ka hana ʻāhi ʻana ma ke āpau o ka wili, kahi e wela ai ka mea. , a hiki ke hāʻule ke kaumaha molekala o ka extruder ma kahi o 40%. Inā nui ka āpau a ʻaʻole i hoʻokomo ʻia ka wili, e pili ka mea i ka metala wela.Eia naʻe, ʻo ka hoʻohana ʻana i ka hoʻololi like o ka extruder māhoe māhoe, ʻaʻohe pilikia.Mea i loko o ka extruder e ka shearing hana o ka liʻiliʻi, plasticizing i ka makemake nui o ka wela, nā mea a pau mai me ka wela kumu, a pela hiki ke pololei ka mana, i hiki ke hana i ka mea i loko o ka extrusion kaʻina e hōʻemi i ka wela degradation, i ka manawa like ma. no ka mālama ʻana i ke kahe waiwai o ka mea maʻamau a paʻa i ka ihu, pono e kūpono ka nui o ka ʻāpana ihu o ka hoʻolālā me ka nui o kahi mea lawe uila.ʻAʻole wikiwiki ka māmā holo, ma kahi o 10 mau kipi i kēlā me kēia minuke.I mea e pale aku ai i ka pili koke ʻana o nā mea i ka ʻili metala, pono e mālama pono ʻia ka mahana extrusion.

5. Plunger extrusion molding

Plunger extrusion processing plastic, plastic processing is a old old method, mai ka puka ʻana mai o kēia mea, hoʻomaka ka poʻe e hoʻohana i kēia ʻano hana i ka plastic.Hoʻohana ʻia ka PTFE me kahi plunger extruder ma ke kaomi ʻana i ka resin quantitative i loko o ka mold inlet, e hoʻihoʻi i ka plunger a kaomi ʻana i kahi huahana preformed.No laila, hoʻi a i waho, i loko o ka waha e hoʻoheheʻe ʻia e hana i nā huahana multi-stage pre-mollding.Ma muli o ka friction ma waena o ka resin PTFE a me ka friction ma waena o ka resin PTFE a me ka pā mold, a me ka hoʻonui nui ʻana o ka huahana preformed i ka wā o ka sintering i ka mold, ua hoʻopaʻa ʻia ka huahana preformed a hoʻomaha ʻia i loko o kahi holoʻokoʻa ma lalo o ke kaomi.ʻO nā mea maikaʻi o kēia ʻano hana penei: ʻaʻohe ʻoki ʻoki i ke kaʻina hana hoʻoheheʻe, emi ke kaumaha o ka molekala pili, maikaʻi ka maikaʻi o ka huahana, ʻaʻole i kaupalena ʻia e ke kaumaha molekala pili.Eia naʻe, ma muli o ka liʻiliʻi liʻiliʻi liʻiliʻi ma waena o nā mea maka a me nā ʻāpana hoʻomehana i ke kaʻina extrusion, haʻahaʻa ka maikaʻi o ka hoʻomehana ʻana, e kaupalena ana i ka wikiwiki extrusion.

6. Nā ʻano hana ʻē aʻe;

Hiki ke hana ʻia ʻo PTFE e ka hoʻoheheʻe ʻana, ka hoʻoheheʻe calendering, ka hoʻoheheʻe ʻana a i ʻole ka hoʻoheheʻe lua.