2K lossis 'two-shot' injection molding muaj cov zauv ob hom polymers (los yog ob qho tib si xim ntawm ib lub polymer) rau hauv qhov kawg ntawm kev siv ib txoj kev txhaj tshuaj molding. Txoj kev siv tshuab no yuav pab tau ntau yam kev ua haujlwm kom muaj kev sib xyaw nrog cov khoom siv moulded.
Ib qho tseem ceeb ntawm 2K koob molding piv rau overmoulding yog tias cov polymer yuav tsum txhaj yog tseem kub thiab tsis shrunk tsis tau. Qhov no zoo excludes qhov kev pheej hmoo ntawm burrs raug tsim nyob rau hauv ob feem tivthaiv. Ntxiv mus, cov nplaim tseem 'virginally' huv, enabling zoo molecular adhesion.
Lwm qhov zoo dua yog lub sij hawm voj voog, cov txheej txheem tas li thiab qhov tseeb uas tsis yog qhov yuav tsum tau siv, yog li tsis txhob muaj kev puas tsuaj rau thawj feem.