A na-emepụta ngwaahịa thermoforming na-adabere na mpempe akwụkwọ, nke na-agwụcha site na extruder. A na-eji usoro extrusion na-akpụzi plastik ahụ ka ọ bụrụ otu agbaze, na n'ime usoro a, nrụgide na-ewuli elu site na ịghasa isi extruder na-aga n'ihu.
Ihe mkpofu plastik bụ akụkụ dị mkpa nke mkpofu siri ike. Dị ka ọnụ ọgụgụ si kwuo, mmepụta kwa afọ nke nkwakọ ngwaahịa rọba n'ụwa niile bụ tọn 130 nde, na 50% nke ngwaahịa rọba bụ ihe a na-ewepụ,
Ọ bụrụ na ejima-screw extruder kewara n'ime akụkụ abụọ bụ isi nke "extrusion" na "nfefe", mgbe ahụ, "akụkụ extrusion" bụ akụkụ bụ isi nke "ịhụ àgwà", na "akụkụ nnyefe" bụ akụkụ bụ isi nke "ịkwalite arụmọrụ" na "ịhụ mma".
Agba Masterbatch, nke a makwaara dị ka colorants, bụ ụdị ọhụrụ pụrụ iche na-ahụ maka agba agba maka ihe polymer, nke a makwaara dị ka nkwadebe pigmenti.
Ihe mejupụtara osisi-plastic nke akpọrọ WPC bụ nke obere biomass fibers dị ka sawdust, ibe osisi, ibe achara, mkpo osikapa, bran osikapa, shei ahụekere, ahịhịa owu, wdg dị ka isi akụrụngwa. A na-agwakọta ha na akụkụ ụfọdụ nke ihe ndabere rọba site na iji ụkpụrụ nke kemịkalụ polymer interface na njirimara nke ndochi plastik na mgbanwe. Mgbe nhazi pụrụ iche gasịrị, a na-edozi ha ma guzobe n'ime ihe ndị bụ isi na-agbanwe agbanwe na nke a na-emegharị ya na ngwaahịa dị iche iche na ụdị ọdịdị dị iche iche. Ihe WPC nwere njirimara ise:
The meshing co rotating twin screw extruder anyị na-eji na anyị mmepụta usoro nwere isi isii paramita: okpomọkụ elu, mgbali elu, viscosity dissipation, mixing index.