Dongguan Enuo mold Co., Ltd ndi gulu laling'ono la Hong Kong BHD Gulu, kapangidwe ka nkhungu za pulasitiki ndi kupanga ndiye bizinesi yawo yayikulu.Komanso, mbali zitsulo CNC Machining, mankhwala prototype R&D, anayendera fixture / Gauge R&D, pulasitiki zopangidwa akamaumba, kupopera mbewu mankhwalawa ndi msonkhano komanso kuchita nawo.
Chikombolecho chimakhala ndi zigawo ziwiri zazikulu, jekeseni nkhungu (A mbale) ndi ejector mold (B mbale).Zigawozi zimatchedwanso moulder ndi moulder.Pulasitiki utomoni amalowa nkhungu kudzera sprue kapena chipata mu jekeseni nkhungu;The sprue bushing ndi kusindikiza mwamphamvu pamphuno ya jekeseni wa mbiya ya makina omangira ndi kulola pulasitiki yosungunuka kutuluka mu mbiya kulowa mu nkhungu, yomwe imadziwikanso kuti patsekeke.The sprue bushing imatsogolera pulasitiki yosungunuka kupita pabowo img kudzera mu ngalande zomwe zimapangidwira kumaso a mbale za A ndi B.Njirazi zimalola pulasitiki kuyenda pambali pawo, motero amatchedwa othamanga.Pulasitiki wosungunuka umayenda kudzera pa wothamanga ndikulowa pachipata chimodzi kapena zingapo zapadera ndikulowa mu geometry yamkati kuti apange gawo lomwe mukufuna.
Ngakhale kuti kuyerekezera anthu obadwa ku North America panthaŵi imene ku Ulaya kunkakumana nawo n'kovuta, kuyesa kunachitika kumayambiriro kwa zaka za m'ma 1900 ndi James Mooney pogwiritsa ntchito mbiri yakale kuti awerengere kuchuluka kwa anthu okhala kumpoto kwa Mexico mu 1600. Posachedwapa zaka, Douglas H. Ubelaker wa Smithsonian Institution wasintha ziwerengerozi.Ngakhale kuti Ubelaker anayerekezera kuti kunali anthu 92,916 kum’mwera kwa nyanja ya Atlantic komanso anthu 473,616 m’chigawo cha Gulf, akatswiri ambiri amaona kuti chiwerengerochi n’chochepa kwambiri.
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