Plastic molding yɛ mfiridwuma mu mfiridwuma a ɛfa akwan horow a wɔfa so dan plastic ma ɛbɛyɛ plastic nneɛma. Wɔ saa nsakrae yi mu no, nea edidi so yi mu biako anaa nea ɛboro saa taa ba: nsakrae a ɛba polymer rheology ne honam fam ne nnuru su mu.
Nhyɛso a Wɔde Yɛ Nneɛma
Adwinnade titiriw a wɔde yɛ compression molding ne press ne mold. Press a wɔtaa de di dwuma ne hydraulic press a ɛwɔ ne ho, a ne duru fi tɔn du du kosi ɔhaha pii. Ase-nhyɛso mfiri ne soro-nhyɛso mfiri wɔ hɔ. Wɔfrɛ nkuku a wɔde yɛ nhyɛsoɔ nkukuo no nhyɛsoɔ nkukuo, a wɔakyekyɛ mu akuo mmiɛnsa: nkukuo a ɛboro so, nkukuo a ɛboro so, semi-nkukuo a ɛboro so, ne nkukuo a ɛnyɛ-nsuo a ɛboro so. Mfaso titiriw a ɛwɔ compression molding so ne sɛ etumi nwene nneɛma a ɛwɔ soro a ɛyɛ tratraa na etumi yɛ pii. Nea enye wɔ ho ne sɛ ɛyɛ nneɛma a wɔyɛ no bere tenten na ɛnyɛ adwuma yiye.
Injection Molding a Wɔde Yɛ Nneɛma
Lamination molding taa de lamination press di dwuma. Saa press yi wɔ press mprɛte a ɛyɛ hyew a ɛsensɛn nsu so pii wɔ nhyɛso mprɛte a ɛkɔ ne nea egyina hɔ ntam. Nneɛma a wɔtaa de hyɛ mu den wɔ lamination molding mu ne ntama a wɔde kotoku ayɛ, ahwehwɛ ntama, krataa, ne ntama a wɔde asbestos ayɛ. Nneɛma a wɔde yɛ nneɛma no bi ne phenolic resins, epoxy resins, polyester resins a enni ahoɔden, ne thermoplastic resins bi. Injection blow molding, extrusion blow molding, stretch blow molding, film coating, ɔhyew a ɛyɛ hyew a wɔde kata so, fluidized mpa so spraying, ogya a wɔde petepete so, electrostatic spraying, plasma spraying.
Extrusion Nsusuwii a Wɔde Yɛ Nneɛma
Extrusion molding, a wɔsan frɛ no extrusion molding anaa extrusion, yɛ ɔkwan a wɔfa so yɛ nneɛma bere nyinaa denam die so wɔ tebea a ɛsen mu denam ɔhyew ne nhyɛso a wɔde hyɛ mu wɔ extruder mu no so. Wɔde extrusion di dwuma titiriw de nwene thermoplastics, nanso wobetumi de adi dwuma nso ama thermosetting plastics bi. Nneɛma a wɔayi afi mu no yɛ profile ahorow a ɛkɔ so, te sɛ paipu, abaa, nhama, sini, ne waya ne nhama a wɔde kata so. Bio nso, wobetumi de adi dwuma de afrafra plastic, ayɛ granulation a wɔde plastic ayɛ, de kɔla ayɛ, na wɔde afra. Afiri a wɔde yɛ extrusion molding no yɛ extrusion mfiri, afiri a wɔde fa nneɛma kɔ, ne ɔhyew ne onwini nhyehyɛe. Extruders wɔ ahorow abien: screw type (skru biako ne multi-skru) ne plunger su. Kan no yɛ adeyɛ a ɛkɔ so yi fi mu, bere a nea etwa to no yɛ nea ɛkɔ so bere ne bere mu. Mfitiaseɛ nhyehyɛɛ a ɛwɔ-screw extruder baako mu titire ne afiri a wɔde fa nkra, afiri a ɛma aduane, toa, skru, die ti, ne die. Mfiri a ɛboa ma extruders no gu akuw atitiriw abiɛsa mu: mfiri a wɔde di kan yɛ nneɛma ho adwuma (te sɛ nneɛma a wɔde kɔ na ɛyow), mfiri a wɔde yɛ extrudate ho adwuma (a wɔde yɛ nneɛma, ɛma onwini, twetwe, twitwa, anaasɛ wɔbobɔw), ne mfiri a wɔde hwɛ sɛnea nneɛma yɛ no tebea so.
Pultrusion Nsusuwii a Wɔde Yɛ Nneɛma
Pultrusion yɛ akwan a wɔfa so yɛ nwene a wɔde yɛ thermosetting fiber-reinforced plastics no mu biako. Wɔde yɛ profile ahorow a ɛwɔ cross-sectional shape a ɛyɛ pintinn na ne tenten nni anohyeto. Nneɛma a wɔde yɛ nkuku no hwehwɛ sɛ wɔtwe nhama a ɛkɔ so a wɔde resin ahyɛ mu ma denam die a ɛyɛ hyew so, na afei wɔsan sa resin no yare wɔ ɔhyew dan mu ma ɛyɛ ɔkwan biako a ɛkɔ soro-ahoɔden a ɛkɔ so hyɛ mu den plastic profile.
Resin ahorow a wɔtaa de di dwuma de yɛ pultrusion molding no bi ne polyester a ɛnyɛ saturated, epoxy, ne silicone. Polyester resin a ɛnyɛ den na wɔde di dwuma kɛse. Mpɛn pii no, pultrusion molding afiri yɛ fiber nhyehyɛe afiri, resin tank, preforming afiri, die ne ɔhyew afiri, traction afiri, ne twa mfiri.
