Plastic extruders ni gaw plastics galaw ai bungli hta madung arung arai ni rai nna, pipe, profile, sumla hkrung, wire hte cable ni hpe shinggrup da ai zawn re ai arung arai ni hpe galaw shapraw ai hta grai law hkra jai lang ai. Ndai lam hta lahkam law law lawm ai, dai hta raw material hkyen lajang ai, katsi ai hte hka lim ai, plastici ai hte extruding galaw ai, gram lajang ai hte katsi ai, hpang- hpe galaw ai lam ni lawm ai. Lahkam shagu gaw hpang jahtum na arai a hkam kaja lam hpe grai hkra machyi shangun ai. Ndai laika hta plastic extruder langai a madang masat masa galaw ai lam hte madung hpaji masa ni hpe hkrang shapraw ai hku sang lang dan ai.
1. Raw arung arai ni hpe hkyen lajang ai lam hte tau hkrau hkyen lajang ai lam
Plastic extrusion galaw ai lam hta shawng nnan na lahkam gaw, raw materials ni hpe jep joi nna, shawng tsi lajang ai lam rai nga ai. Dai arung arai ni ra sharawng ai hta hkan nna, raw materials ni gaw langai sha resin ( polyethylene (PE) shing nrai polypropylene (PP)) shing nrai, arung arai law law hpe shinggyin la lu ai (calcium carbonate fillers (sh) masterbatch ni lawm ai zawn re ai) langai sha resin langai sha rai mai ai. Raw arung arai ni gaw lawu na ra kadawn ai lam ni hpe hkan sa ra ai:
San seng ai lam: N san seng ai lam ni hte awu asin byin ai lam hpe koi ra ai ( metal particles hte paper scraps ni zawn re ai) gaw, jak rung ni hpe hkra machyi shangun ai (sh) arung arai n kaja ai lam ni hpe byin shangun chye ai.
Dryness: Hygroscopic arung arai ni (nylon PA hte polycarbonate PC zawn re ai) hpe 80–120℃hta katsi ai hku katsi shangun ra ai, dai gaw extrusion galaw ai shaloi bubble ni hpe makawp maga na matu re.
Mixing Uniformity: Formulation hta additives ni lawm yang, masterbatch (sh) kaga additives ni hpe tsaw ai{0}}}speed mixer hta shawng nnan lang garan nna, langai sha re ai hku garan ginhka lu na matu.
II. Lusha hte shat shadu sha ai lam
Pretreated raw materials ni hpe extruder barrel kata de hopper langai hku nna shang shangun ai. Dai ni na aten na extruder ni hta, matut manoi hte ngang grin ai malu masha hpe lu la na matu, atik anang shadu sha ai wa (sh) n-gun rawng ai feeder hpe lang chye ma ai. Ndai aten hta ahkyak ai myit yu ai lam ni gaw:
Feed Rate Matching: Ndai hpe screw lawan ai hte hka lim ai atsam hte matut mahkai nna, barrel kata hta arung arai ni hpe shinggyin la na (sh) n-gun n rawng hkra galaw ra ai.
Anti- Npu na hkrang: Hopper a kata bunghku hpe n-gun n rawng ai majaw, n-gun n rawng ai hte pat shingdang ai lam ni hpe pat shingdang na matu, n-gun n rawng ai (sh) n-gun n rawng ai hku galaw ai.
III. Hka lum ai, hka ja ai, hte Plasticization
Dai raw materials ni barrel de shang wa ai hpang, screw rotation hte shinggan na katsi ai lam ni a hpawng de ai action a majaw loi loi hte hka lim mat nna plasticized byin mat ai. Ndai ladat hpe functional zone masum hku garan nna galaw ai:
Conveying Section (Feeding Section): Screw gaw n-gun n law ai sha shinggrup nna, arai hpe shawng de sit shangun ai. Barrel nbung katsi ai lam gaw n law ai (typically 80–120℃).
Garu ai Daw (Melting Section): Barrel nbung katsi ai lam hpe plastic a hka lim ai shara (ga shadawn, PE a matu 160–180℃daram) a ntsa de loi loi hte jat wa ai. Screw goove sung ai lam yawm wa ai, shear n-gun ni hpe jat wa nna, solid particle ni hpe viscous melt de galai shai wa ai.
Metering Section (Homogenization Section): Nbung katsi ai lam hpe n galai shai ai hku tawn da ai (hka lim ai shara kaw nna loi mi jan ai), screw gaw lawan ai hku galaw nna, ngang grin ai hka lim ai n-gun hte langai sha re ai nsam hpe hkam la lu na matu galaw ai.
Madung hpaji masa ni: Barrel nbung n-gun n-gun n-gun, screw lawan ai (typically 50–300 rpm), hte hka lim ai n-gun (5–20 MPa) hpe arung arai atsam ni hte maren gram lajang ra ai. Ga shadawn, PVC hpe galaw ai shaloi, n-gun yawm ai (150–180℃) ra ai.
IV. Extrusion hte Die form
Plasticized melt hpe die bawnu hku nna shapraw nna ra sharawng ai cross{0}} daw hkrang hpe galaw ai (ga shadawn, round tubes (sh) rectangular profiles zawn re ai). Die design gaw product a quality hpe hkrak hkra hkra machyi shangun nna lawu na ra kadawn ai lam ni hpe hkan sa ra ai:
Flow channel balance: Hka lim ai shara shagu hta langai sha re ai n-gun hpe n-gun jaw ai (sh) n-gun n-gun n-rawng ai hpe koi lu na matu.
Temperature control: Die temperature gaw, n-gun n-gun hpe shayawm kau nna, n-gun hpe n-gun n-gun hpe gram lajang na matu, barrel nbung hta loi mi yawm ai.
V. Hka lum ai hte ka ai
Hot extrud ai melt hpe lawan ladan katsi hkra galaw ra ai. Common ladat ni gaw:
Hka katsi ai lam: Ndai hpe hka tank (sh) hka lim ai ladat (pipe galaw ai line ni hta zawn re ai) hta lup nga ai hku nna lu la ai. Hka lum ai hka katsi ai hpe dai arung arai hpe madung tawn nna gram lajang ra ai (galaw madang 15–40℃).
Nbung katsi ai lam: N-gun n rawng ai sumla hkrung ni (sh) n-gun n rawng ai arung arai ni a matu htuk manu ai, nbung katsi ai hpe shayawm na matu fan (sh) chill roll ni hpe lang ai.
Dai laman, sumla ka ai jak gaw, dimensional stability hpe n-gun n-htum hkra, n-gun n-htum hkra gang je kau ai. Hkrang shala ai lawan ai hte extrusion lawan ai (draw ratio) a ratio gaw, dai arung arai a n-gun hte hkum hkrang atsam ni hpe dawdan ya ai.
VI. Cut galaw ai hte Posti{1}}Processing
Katsi mat ai hpang, dai arung arai hpe daw ni (ga shadawn, 6-meter tubes) (sh) hkala nba ni hku nna, online cutter lang nna, roll (ga shadawn, sumla hkrung, wire, hte cables) ni hku nna daw kau ai. Nkau arung arai ni gaw, matut nna galaw ra ai, ga shadawn:
Surface tsi lajang ai lam: Hkrang n-gun hpe jat ya lu ai flame tsi lajang ai (sh) corona tsi lajang ai lam;
Quality jep joi ai lam: Infrared thickness gauge (sh) ntsa n kaja ai lam ni hpe mu lu ai hku jep yu ai hpe lang nna bunghku a n-gun hpe yu reng ai.
Plastic extrusion galaw ai lam gaw hpaji amyu myu hte hpaji chye ai (polymer arung arai hpaji, jak hpaji, hte thermodynamics) ni hpe hpawng de ya ai. Stage shagu hta parameters ni hpe grau kaja hkra galaw ai (ga shadawn, temperature profile hte screw configuration) gaw galaw shapraw ai atsam hte product quality hpe grai kaja hkra galaw ya lu ai. Hpaji rawng ai galaw shapraw ai hpaji masa rawt jat wa ai hte rau, dai ni na aten na extrusion jak ni gaw, tengman ai- aten hpe yu reng ai lam hte, shi hkum shi bai htang ai lam ni hpe hpaw shabawn da ai, plastic ni hpe galaw ai bungli hpe, tsaw ai-precision hte grup yin hpe makawp maga ai lam ni de grau nna woi sa wa ai.
