细孔

Plastic material is extruded through very small holes to form fibres.

塑料从细孔挤压出来形成纤维。

Pinhole. A short unwelded area in the weld line extending through the entire pipe so that fluid will leak out through the area very slowly.

针孔。指焊缝线上位焊接的、贯整个壁厚的细孔，可导致流从该孔缓慢漏出。