The isi ịghasa adopts BM elu-arụmọrụ ụdị, na mmepụta bụ ngwa ngwa na plasticized ọma.
A na-achịkwa ọkpụrụkpụ mgbidi nke ngwaahịa ọkpọkọ na obere ihe mkpofu nke akụrụngwa.
Tubular extrusion ebu pụrụ iche, ihe nkiri mmiri na-agba ọsọ dị elu, nke nwere valvụ njikwa mmiri jikọtara ọnụ na ọnụ ọgụgụ.