ʻO ka lāʻau maoli a me ka metala nā mea kūkulu hale pono no nā kānaka no nā kaukani makahiki. ʻO nā polymers synthetic a mākou i kapa ai he plastics kahi mea hou i pahū i ke kenekulia 20.
Loaʻa nā metala a me nā plastics i nā waiwai i kūpono no ka hoʻohana ʻana i nā ʻoihana a me nā ʻoihana. nā mea hoʻolālā:ʻaʻole maikaʻi nā mea hana'ilika, aʻaʻohe mea makemake e noho i loko o ka hale'ilika.
Ma kekahi mau noi, hiki i ka laau maoli ke paio me na metala a me na plastics. Ua kukuluia ka hapa nui o na hale ohana ma ke kalai laau. ʻO ka pilikia, he palupalu loa ka lāʻau maoli a he maʻalahi loa ka pōʻino i ka wai e pani ai i ka plastic a me ka metala i ka hapa nui o ka manawa. koke?
ʻO ka hale fibrous o ka lāʻau aia ma kahi o 50% cellulose, he polymer maoli me nā waiwai ikaika theoretically maikaʻi. ʻO ke koena o ka hapalua o ka hale lāʻau he lignin a he hemicellulose. ʻOiai ʻo cellulose e hana lōʻihi, paʻakikī paʻakikī e hāʻawi i ka lāʻau me ka iwi kuamoʻo o kona ikaika maoli, he liʻiliʻi ko ka hemicellulose i hui pū ʻia a no laila ʻaʻole e hāʻawi i ka ikaika. hana i nā hana pono no ka lāʻau ola. Akā, no ka manaʻo o ke kanaka ʻo ka hoʻopaʻa ʻana i ka lāʻau a hoʻopaʻa paʻa loa i kona mau mea cellulose, ua lilo ka lignin i mea keakea.
I loko o kēia noiʻi ʻana, ua hana ʻia ka lāʻau maoli i lāʻau paʻakikī (HW) i ʻehā mau ʻanuʻu. kaomi ʻia ka lāʻau ma 105 ° C (221 ° F) no kekahi mau hola hou e hoʻopau ai i ka densification, a laila maloʻo. ʻO ka hope, hoʻokomo ʻia ka lāʻau i loko o ka ʻaila mineral no nā hola 48 e hana i ka wai o ka huahana.
One mechanical waiwai o ka structural mea he indentation paakiki, he ana ia o kona hiki ke pale aku i ka deformation ke kaomi e force.Diamond mea paakiki ma mua o ke kila, paʻakikī ma mua o ke gula, paakiki ma mua o ka laau, a paakiki ma mua o ka packing foam. ili me kekahi ikaika. E ana i ke anawaena o ka indentation poepoe i hanaia e ka poepoe. Ua heluia ka waiwai paakiki o Brinell me ka hoohana ana i ke ano makemakika; ʻO ka ʻoi aku ka nui o ka lua o ka pōleʻa, ʻoi aku ka palupalu o ka mea.
ʻO ka hapa nui o ka lāʻau maoli ʻaʻole i hoʻoponopono ʻia e komo i ka wai. Hiki i kēia ke hoʻonui i ka lāʻau a hoʻopau i kona mau waiwai. hohola i na kulu palahalaha (a mahope iho e komo maalahi i ka wai). No laila, ʻaʻole wale ka hoʻonui nui ʻana o ka wai minerala i ka hydrophobicity o ka HW, akā, ke pale pū nei hoʻi i ka lāʻau mai ka hoʻomoʻa ʻana i ka wai.
Ma kekahi mau ho'āʻo 'enekinia, HW pahi i hana iki maikaʻi ma mua o metala pahi.'Ōlelo nā mea kākau i ka pahi HW ma kahi oʻekolu manawaʻoi aku o kaʻoi aku o ka pahi i loaʻa i ke kālepa. ʻo ka ʻiʻo hoʻokahi me ka ʻaoʻao ʻūlū o ka ʻōpala metala, a ʻoi aku ka maikaʻi o ka pahi steak.
Pehea e pili ana i na kui? Hiki i ke kui HW hoʻokahi ke hoʻopaʻa maʻalahi i nā papa ʻekolu, ʻaʻole naʻe e like me ka kikoʻī e like me ka maʻalahi i ka hoʻohālikelike ʻia me nā kui hao. Hiki i nā mākia lāʻau ke hoʻopaʻa i nā papa, me ka pale ʻana i ka ikaika e wāwahi iā lākou, me ka ʻoi aku ka paʻakikī e like me nā maʻi hao. hōʻike ʻia.
ʻOi aku ka maikaʻi o nā kui HW ma nā ʻano ʻē aʻe? ʻOi aku ka māmā o nā mākia lāʻau, akā ʻaʻole i hoʻoikaika mua ʻia ke kaumaha o ka hale e ka nui o nā mākia e paʻa ai.
ʻAʻohe mea kānalua ua hoʻomohala ka mea kākau i kahi hana e hana ai i ka lāʻau i ʻoi aku ka ikaika ma mua o ka lāʻau maoli. Akā naʻe, pono e aʻo hou ka pono o ka ʻenehana no kēlā me kēia hana. Hiki iā ia ke ʻoi aku ka liʻiliʻi a me ka waiwai ʻole e like me ka plastic?
Ka manawa kau: Apr-13-2022
