Nūhou

I nā makahiki i hala iho nei, ua hoʻokumu ʻia nā ʻōnaehana extruder multi-screw i ka mākeke ma ke ʻano he koho no Single - screw extruders me kahi ʻōnaehana hoʻomaloʻo mua. (Eia mākou e kapa aku ai i ka ʻōnaehana extrudering multi-screw me nā Twin-screw extruders, Planetary roller extruders etc.)

Akā manaʻo mākou he mea pono e loaʻa i ka ʻōnaehana pre-drying ʻoiai ke hoʻohana nei ʻoe i ka multi-screw extruder. No ka mea:

1) ʻO nā mea hoʻoheheʻe multi-screw ka mea i loaʻa iā lākou a pau, he paʻakikī loa nā ʻōnaehana hoʻoheheʻe ʻia i hoʻokomo ʻia ma luna o ka extruder e pale ai i ka hopena hydrolysis ma muli o ka hoʻokomo ʻole ʻia ʻana o ke kaʻina hana maloʻo. ʻO ka mea maʻamau, ʻokoʻa kēlā ʻano extruder me ka hoʻohana ʻana i ke kūlana:

ʻAʻole pono ke kiʻekiʻe o ka mākū hānai i ʻae ʻia ma mua o 3000 ppm (0.3 %)

ʻO ka ʻoiaʻiʻo, hōʻike ʻia nā ʻāpana ʻōmole i nā ʻano like ʻole o ka maʻemaʻe, ka nui o ka ʻāpana, ka puʻupuʻu nui a me ka mānoanoa - a ʻoi loa i ka haʻahaʻa. Hiki i nā flakes post-consumer ke mālama i ka 5,000 ppm o ka haʻahaʻa i loko o ka huahana a mālama pinepine i kēia nui o ka wai ma luna o kona ʻili. I kekahi mau ʻāina, hiki ke piʻi i ka 14,000 ppm ka wai hānai i loko o ka Big Bag.

ʻO ke kiʻekiʻe piha o ka wai a me kona mau ʻokoʻa, ʻaʻole hiki ke pale ʻia, ʻo ia ka paʻakikī maoli no ka multi-screw extruder a me ka manaʻo degassing pili. ʻO kēia ka hopena pinepine i nā loli kaʻina hana, i ʻike ʻia mai nā kaomi hoʻololi loa o ka extruder. He mea hiki loa ke waiho ʻia ka nui o ka wai i ka hiki ʻana i kona pae heheʻe i loko o ka extruder ma muli o ka pae wai mua i ka resin, a me ka nui i hoʻoneʻe ʻia i ka wā o ka vacuum

2) He hygroscopic nui ka PET a hoʻopaʻa i ka makū mai ka lewa. ʻO ka liʻiliʻi o ka wai e hydrolyze i ka PET i ka māhele heheʻe, e hōʻemi ana i ke kaumaha mole. Pono e maloʻo ka PET ma mua o ka hana ʻana, a pono ka PET amorphous i ka crystallizing ma mua o ka hoʻomaloʻo ʻana i ʻole e pili nā ʻāpana i ko lākou hele ʻana me ka hoʻololi aniani.

Hiki ke hana ʻia ka hydrolysis ma muli o ka makū a ʻike pinepine ʻia kēia ma ke ʻano he hōʻemi i ka IV (Intrinsic Viscosity) o ka huahana. ʻO PET ka "semi-crystalline". Ke hoʻemi ʻia ka IV, ʻoi aku ka palupalu o nā hue a hāʻule i ka "puka" (injection point) i ka wā o ka puhi ʻana a me ka hoʻopiha ʻana.

I loko o kona moku'āina "crystalline" aia nā ʻāpana crystalline a me nā ʻāpana amorphous i kona ʻano mole. Hoʻokumu ka ʻāpana crystalline i kahi e hiki ai i nā molekole ke hoʻohālikelike iā lākou iho i kahi ʻano laina laina paʻa loa. I loko o nā ʻāpana kalakala ʻole nā ​​molekala i kahi hoʻonohonoho ʻokoʻa. Ma ka hōʻoia ʻana i ke kiʻekiʻe o kāu crystallinity, ma mua o ka hoʻoili ʻana, ʻoi aku ka hopena o ka huahana a ʻoi aku ka maikaʻi.

Ua hana ʻo ODE Made IRD Infrared Rotary Drum Systems i kēia mau hana liʻiliʻi ma kahi ala ʻoi aku ka maikaʻi o ka ikehu. Hoʻoulu ʻia ka hoʻoheheʻe ʻana o ka infrared i ka molecular molecular fluctuation i loko o ka mea maloʻo me ka ʻole o ka lawe ʻana i ka pae waena kūpono ʻole o ka hoʻohana ʻana i ka ea wela. ʻO ia ʻano hoʻomehana i ka wela a me ka hoʻomaloʻo ʻana i hoʻemi ʻia i ka laulā o 8.5 wale nō a hiki i 20 mau minuke ma muli o ka noi kikoʻī, ʻoiai he mau hola e helu ʻia no nā ʻōnaehana wela a maloʻo paha.

Hiki i ka hoʻomaloʻo infrared ke hoʻomaikaʻi nui i ka hana o kahi extruder twin-screw no ka mea e hoʻemi ana i ka hoʻohaʻahaʻa ʻana o nā waiwai IV a hoʻomaikaʻi nui i ka paʻa o ke kaʻina holoʻokoʻa.