He lālā ʻo Dongguan Enuo mold Co., Ltd o Hong Kong BHD Group, ʻo ka ʻoihana nui ka hana ʻana i ka ʻōpala injection a me ka hoʻoheheʻe ʻana i ka injection. Eia kekahi, he hale hana OEM nō hoʻi ʻo Enuo mold e hana ana i ka R&D o nā mea nānā/Gauge, Die casting, CNC machining, Prototype products R&D, Parts spraying a me ka ʻākoakoa ʻana.
ʻElua mau ʻāpana nui o ka mold, ʻo ia ka mold injection (papa A) a me ka mold ejector (papa B). Ua kapa ʻia kēia mau ʻāpana he moulder a me mouldmaker. Komo ka resin plastik i loko o ka mold ma o kahi sprue a i ʻole ka puka i loko o ka mold injection; ʻo ka bushing sprue e sila pono i ka nozzle o ka pahu injection o ka mīkini hoʻoheheʻe a e ʻae i ka plastic i hoʻoheheʻe ʻia e kahe mai ka pahu i loko o ka mold, i ʻike ʻia hoʻi ʻo ka lua. Hoʻokele ka bushing sprue i ka plastic i hoʻoheheʻe ʻia i ka lua ma o nā kahawai i mīkini ʻia i loko o nā maka o nā papa A a me B. ʻAe kēia mau kahawai i ka plastic e holo ma o lākou, no laila ua kapa ʻia lākou he mau mea holo. Kahe ka plastic i hoʻoheheʻe ʻia ma o ka mea holo a komo i hoʻokahi a ʻoi aku paha nā puka kūikawā a i loko o ke ʻano lua e hana i ka ʻāpana i makemake ʻia.
ʻOiai he paʻakikī ke kuhi ʻana i ka heluna kanaka maoli o ʻAmelika ʻĀkau i ka manawa o ka launa pū ʻana me ʻEulopa, ua hoʻāʻo ʻia i ka hapa mua o ke kenekulia iwakālua e James Mooney me ka hoʻohana ʻana i nā moʻolelo mōʻaukala e kuhi i ka heluna kanaka ʻōiwi ma ka ʻākau o Mekiko i ka makahiki 1600. I nā makahiki i hala iho nei, ua hōʻano hou ʻo Douglas H. Ubelaker o ka Smithsonian Institution i kēia mau helu. ʻOiai ua kuhi ʻo Ubelaker he 92,916 ka heluna kanaka ma nā mokuʻāina ʻo ʻAkelanika hema a he 473,616 ka heluna kanaka ma nā mokuʻāina ʻo Gulf, manaʻo ka hapa nui o nā loea he haʻahaʻa loa ka helu.
