Plastik molding em i wanpela enjiniaring teknoloji we i gat kain kain wok bilong senisim ol plastik i kamap ol plastik prodak. Long taim bilong dispela senis, wanpela o moa bilong ol dispela samting i save kamap: senis long 'polymer rheology' na ol samting bilong bodi na kemikel.
Kompresen Molding
Ol bikpela samting bilong wokim 'compression molding' em i wanpela 'press' na 'mold'. Pres we ol i save yusim planti em i wanpela 'self-contained hydraulic press, we hevi bilong en i save stat long tenpela i go inap long handet ton. I gat ol 'bottom-pressure pressure' na 'top-pressure pressures. Mold we ol i save yusim long wokim 'compression molding' ol i kolim 'compression mold', we ol i brukim i go long tripela lain: 'overflow molds', 'semi-overflow molds', na 'non-overflow molds. Ol bikpela gutpela samting bilong 'compression molding' em olsem em inap long wokim ol samting wantaim bikpela 'flat surface' na em inap long kamapim planti samting. Ol hevi bilong en em longpela taim bilong prodaksen na liklik wok bilong en.
Injeksen Molding
Lamination molding i save yusim wanpela 'lamination press'. Dispela kain pres i gat planti 'floating hot press plates' namel long ol 'muving' na 'stationary pressure plates'. Ol samting we ol i save yusim long strongim ol samting long 'lamination molding' em ol laplap bilong koten, laplap bilong glas, pepa, na laplap bilong 'asbestos'. Ol resin i gat ol 'phenolic resin', 'epoxy resin', 'unsaturated polyester resin', na sampela 'thermoplastic resin'. Injection blow molding, extrusion blow molding, stretch blow molding, film coating, hot melt coating, fluidized bed spraying, flame spraying, electrostatic spraying, plasma spraying.
Ekstrusen Molding
'Extrusion molding', ol i save kolim tu olsem 'extrusion molding' o 'extrusion', em i wanpela rot bilong wokim ol samting oltaim long wanpela 'die' we i ron long rot bilong hatim na putim presa long en insait long wanpela 'extruder'. Ol i save yusim 'extrusion' long wokim ol 'thermoplastics', tasol ol i ken yusim tu long sampela 'thermosetting' plastik. Ol prodak we ol i rausim em ol samting we i save stap oltaim, olsem ol paip, stik, 'filament', 'film', na 'wire' na 'cable sheathing'. Na tu, ol i ken yusim long miksim plastik, mekim ol 'granulation' i kamap plastik, putim kala, na tanim tanim. Wanpela masin bilong wokim 'extrusion' i gat ol samting bilong 'extrusion', wanpela 'transmission mechanism', na wanpela 'heating' na 'cooling' sistem. Ol 'extruder' i gat tupela kain: kain skru (wanpela skru na planti skru) na plunja kain. Pastaim em i wanpela 'extrusion process' we i save kamap oltaim, tasol namba tu em i save kamap namel long taim. Besik straksa bilong wanpela -skru ekstruda i gat wanpela transmisen divais, fiding divais, barel, skru, dai het, na dai. Ol helpim ikwipmen bilong ol 'extruder' i stap long tripela bikpela kategori: ol ikwipmen bilong pritritim ol samting (olsem ol samting bilong karim na draim), ol ikwipmen bilong prosesim ol 'extrudate' (sepim, kolim, pulim, katim, o rolim), na ol ikwipmen bilong bosim kondisen bilong prodaksen.
Pultrusion Molding
Pultrusion em i wanpela rot bilong wokim ol plastik we i gat 'thermosetting fiber-reinforced. Ol i save yusim long kamapim ol profail wantaim wanpela 'fixed cross-sectional shape' na i no gat mak bilong en. Wok bilong wokim 'moulding' i gat wok long pulim ol 'fibers' we i gat 'resin' long en long wanpela 'heated die', na bihain ol i mas mekim 'resin' i kamap strong moa insait long wanpela 'heating chamber' bilong kamapim wanpela 'unidirectional high-strength continuously reinforced plastic profile.
Ol resin we ol i save yusim long wokim 'pultrusion molding' em ol 'unsaturated polyester', 'epoxy', na 'silicone'. Unsaturated polyester resin em i nambawan samting ol i save yusim. Wanpela masin bilong wokim 'pultrusion' i save gat wanpela 'fiber arrangement device', 'resin tank', 'preforming device', 'die' na 'heating device', 'traction device', na 'cutting equipment'.
