Gas-injection molding for hollow components

In the internal gas pressure method, compressed nitrogen is introduced into the mold during the injection process. As a result, the malleable plastic core is displaced, a cavity is formed and the plastic mass is optimally distributed. The material is compressed by a uniform internal gas pressure in the cavity and pressed against the mold walls. This prevents warping and uneven shrinkage during cooling and consequent sink marks on the product surface and greatly improves the surface quality of the injection molded parts.