Ol 'polyurethane' paip, olsem wanpela 'polymer material' we i gat gutpela pefomens, ol i save yusim planti long ol 'petrochemical', 'automotive', 'building water supply' na 'drainage', na ol 'medical device' indastri bikos ol i gat gutpela 'wear resistance', 'oil resistance', 'chemical corrosion resistance', na gutpela 'flexibility' bilong en. sevis laip bilong prodak. Olsem na, bikpela wok painimaut long wok bilong wokim ol 'polyurethane' paip i gat bikpela wok long en.
Ol as tingting na ol samting yu mas mekim bilong wokim ol 'polyurethane' paip
Polyurethane (PU) em i wanpela 'polymer material' we i kamap long 'polymerization reaction' bilong ol 'polyols' na 'isocyanates'. Long lukluk long 'ratio' bilong ol 'soft' na 'hard' hap, ol i ken brukim i go long 'thermoplastic polyurethane' (TPU) na 'cast polyurethane' (CPU). Ol i save wokim ol paip bilong 'polyurethane' long rot bilong 'casting process'. Wok bilong wokim 'mold' i nidim strongpela kontrol bilong ol 'raw material ratios', 'reaction temperature', 'mold design', na ol samting bihain long 'processing' bilong mekim paip i gat strong, strong, na 'surface' bilong en.
Ol bikpela samting bilong wokim ol 'polyurethane' paip em:
1. Raw material pretreatmen: Ol polyols na isocyanates i mas miks gut long wanpela spesifik tempereja long abrusim ol 'residual air bubbles';
2. Kontrol bilong 'reaction': 'Curing reaction' bilong 'polyurethane' i save givim bikpela hat, na i nidim gutpela 'mold temperature' na 'pouring speed' bilong stopim 'localized overheating' na 'cracking';
3. Demolding na post-treatmen: Ol paip we ol i moldim i nidim stretpela post-vulkanisasen o kol bilong mekim dimensen i stap gut.
Ol bikpela wok bilong wokim ol paip bilong 'polyurethane'
1. Kasting Moulding Proses
Kasting molding em i nambawan rot bilong wokim ol paip bilong 'polyurethane'. Ol bikpela step bilong en em:
• Raw Material Mixing: Ol i miksim prepolymer (isocyanate komponen) na chain extender (polyol komponen) long wanpela spesifik resio, na ol i rausim ol 'air bubble' long taim bilong miksim proses yusim 'vacuum degassing'.
• Redim Mold: Ol i mas hatim mol i go inap long gutpela tempereja (planti taim 60~80 digri), na putim wanpela samting bilong rausim mol long daunim pasin bilong pas.
• Kasting na Kuring: Ol i save putim ol miks raw materiel i go insait long mol na kukim aninit long wanpela kain presa (planti taim em i save kamap long win o liklik presa). Taim bilong mekim paip i kamap strong i dipen long bikpela bilong paip na bikpela bilong wol, na planti taim em i save stap long sampela minit i go inap long planti ten minit.
• Demolding: Bihain long paip i kamap orait olgeta, ol i save rausim na katim.
Dispela proses em i gutpela long ol liklik-batch, planti-kain prodaksen, moa yet long wokim ol 'polyurethane' paip wantaim ol kompleks straksa.
2. Ekstrusen Molding Proses
Long wokim planti stretpela paip o ol simpol -straksa 'polyurethane' paip, ol i ken yusim 'extrusion molding'. Dispela wok i gat:
• Raw material melting: Ol i save hatim ol 'thermoplastic polyurethane' (TPU) granules na meltim long yusim wanpela 'screw extruder';
• Extrusion molding: Ol i save rausim ol samting we i melt long wanpela 'die' bilong kamapim wanpela 'tubular structure' we i no senis;
• Kolim na sepim: Ol i save mekim 'extruded tube' i kol hariap long wara o win, na bihain ol i save stretim na katim i go long longpela bilong en long rot bilong wanpela 'traction machine'.
'Extrusion' em i gutpela tru na i gutpela long wokim ol 'standardized polyurethane tubes', tasol em i no gat planti 'flexibility' long 'product structure'.
3. Riaksen Injeksen Moulding (RIM) Proses
Long ol bikpela o strongpela 'polyurethane' tiub, ol i ken yusim 'reaction injection molding'. Dispela proses i involvim long putim ol 'polyols' na 'isocyanates' wanwan insait long ol 'high-pressure cylinders', miksim ol long bikpela spit aninit long bikpela presa, na bihain putim dispela miks i go insait long wanpela 'mold'. Dispela miks i save wok na kamap strong na kamapim laspela seip. RIM em i gutpela long ol tikpela -wol bilong ol 'tube' na i gat sotpela 'moulding cycle' na i gat bikpela strong bilong prodak.
Ol bikpela samting we i save mekim wok bilong wokim 'molding'
1. Raw Material Ratio: Isocyanate index (NCO/OH ratio) i save mekim stret 'crosslinking density' bilong 'polyurethane', na dispela i save mekim 'hardness' na 'elasticity' bilong paip i kamap strong.
2. Kontrol bilong Tempereja: Sapos tempereja bilong 'mold' i antap tumas dispela inap long kamapim ol 'residual bubbles' o ol samting i no stret long pes bilong en, tasol sapos tempereja i go daun tumas dispela inap long mekim taim bilong 'curing' i stap longpela taim.
3. Mold Design: Wanpela gutpela 'runner design' na 'venting system' inap long daunim ol hevi na mekim prodak i kamap wankain.
4. Bihain long tritmen: Sampela 'polyurethane' paip i nidim 'post-vulcanization (olsem ol CPU paip) long strongim hat na ol samting bilong masin.
Taim ol i makim wok bilong wokim ol 'polyurethane' paip, ol i mas tingim gut ol samting we ol i mas mekim, mak bilong prodaksen, na ol samting we i kost. Casting em i gutpela long ol paip we i gat bikpela -stretpela, kompleks-straksa, 'extrusion' em i gutpela long ol bikpela-skel standet prodaksen, na RIM (Reverse Molding Injection) i gat gutpela samting long wokim ol bikpela-skel, hai-pefomens paip. Long bihain taim, wantaim divelopmen bilong teknoloji bilong senisim ol samting long 'polyurethane', ol wok bilong wokim 'mold' bai kamap gutpela moa long inapim ol strongpela wok bilong indastri.
