Why is pultrusion the preferred process for high-precision fiberglass profiles?

Pultrusion yog cov txheej txheem txuas ntxiv rau kev tsim cov ntawv sib xyaw. Nws suav nrog impregnating untwistedfiberglassrovings thiab lwm yam khoom siv txuas ntxiv ntxiv, xws li polyester nto lev, mus rau ib qho scaffold nrog resin. Cov resin yog tom qab ntawd dhau los ntawm cov pwm uas tswj hwm tus ntoo khaub lig tshwj xeeb - ntu cov duab, kho hauv pwm, thiab txuas ntxiv extruded los tsim cov khoom pultruded. Qhov no yog cov txheej txheem ntau lawm.

 

Cov khoom tsim los ntawm cov txheej txheem pultrusion muaj zog tensile ntau dua li cov hlau zoo tib yam. Cov resin- nplua nuj txheej txheej kuj muab kev tiv thaiv corrosion zoo heev, ua rau nws yog qhov zoo tshaj plaws rau cov hlau hauv qhov chaw corrosive. Nws yog dav siv hauv kev thauj mus los, hluav taws xob engineering, hluav taws xob rwb thaiv tsev, tshuaj lom neeg kev lag luam, mining, marine engineering, shipbuilding, corrosive ib puag ncig, thiab ntau yam kev siv hauv tsev thiab pej xeem.

 

Pultrusion Molding Process Flow: Pultrusion txheej txheem tuaj yeem ua ntau hom thiab tuaj yeem faib ua ntau txoj hauv kev. Cov no suav nrog cov txheej txheem tsis sib xws thiab tsis tu ncua, cov txheej txheem ntsug thiab kab rov tav, cov txheej txheem ntub thiab qhuav, taug qab thiab clamped traction, hauv - pwm curing thiab hauv - pwm gelation nrog tawm - ntawm - pwm curing, thiab cua sov txoj kev xws li hluav taws xob cua sov, - cua sov cua sov, microwave cua sov, los yog sib xyaw ua ke txoj kev.

 

Cov txheej txheem pultrusion raug raws li hauv qab no: iav fiber ntau roving kev npaj - Impregnation - Preforming - Extrusion molding thiab curing - Traction - Txiav - Cov khoom tiav

 

Pultrusion khoom Cheebtsam:

 

1. Txhim kho cov khoom siv conveying system: xws li roving ncej, lev kis ntaus ntawv, roving qhov, thiab lwm yam.

 

2. Resin impregnation: Txoj kev ncaj groove impregnation feem ntau yog siv. Thoob plaws hauv cov txheej txheem impregnation, cov fibers thiab mats yuav tsum tau npaj kom zoo zoo.

 

3. Preforming: Cov khoom siv impregnated reinforcing dhau los ntawm cov khoom siv preforming, ua tib zoo thiab tsis tu ncua kom ntseeg tau tias lawv cov txheeb ze txoj haujlwm, maj mam nce mus txog qhov kawg ntawm cov khoom, thiab extruding ntau tshaj resin ua ntej nkag mus rau hauv pwm rau molding thiab kho.

 

4. Pwm: Cov pwm yog tsim raws li cov txheej txheem txheej txheem. Raws li cov resin curing exothermic nkhaus thiab kev sib txhuam cov khoom ntawm cov khoom thiab cov pwm, cov pwm tau muab faib ua peb qhov sib txawv ntawm cov cua sov, qhov kub thiab txias yog txiav txim los ntawm cov khoom ntawm cov resin system. Cov pwm yog qhov tseem ceeb tshaj plaws ntawm cov txheej txheem pultrusion; qhov ntev pwm ntev li ntawm 0.6 txog 1.2 meters.

 

5. Traction Device: Cov cuab yeej traction nws tus kheej tuaj yeem ua tau raws li tus neeg rub tawm lossis ob lub twj tso kua mis reciprocating clamping los xyuas kom muaj kev txav mus tas li.

 

6. Cov cuab yeej txiav: Qhov profile yog txiav mus rau qhov ntev uas yuav tsum tau ua los ntawm kev txav synchronous txiav txiav.

 

Lub luag haujlwm ntawm molding tuag yog kom ua tiav compaction, molding, thiab kho ntawm preform. Tus ntoo khaub lig tuag-sectional qhov ntev yuav tsum coj mus rau hauv tus account lub molding shrinkage tus nqi ntawm cov resin. Kev tuag ntev yog cuam tshuam nrog kev kho ceev, qhov kub thiab txias, cov khoom loj, pultrusion ceev, thiab cov khoom ntawm cov khoom siv ntxiv, thiab feem ntau yog 600-1200 hli. Kev ua tiav qhov siab hauv qhov tuag kab noj hniav yog qhov tsim nyog los txo qhov kev sib txhuam, ua kom ntev kev pab cuam lub neej, thiab pab kom demolding. Hluav taws xob cua sov feem ntau yog siv; microwave cua sov yog siv rau siab -cov ntaub ntawv ua tau zoo. Yuav tsum muaj ib lub tshuab cua txias ntawm qhov tuag inlet kom tiv thaiv kom tsis txhob ntxov ntxov ntawm cov nplaum. Cov txheej txheem impregnation feem ntau tswj cov txheeb ze ntom ntom (viscosity) ntawm cov nplaum thiab lub sijhawm impregnation. Nws cov kev cai thiab cov yam ntxwv cuam tshuam yog tib yam li prepreg.

 

Cov txheej txheem curing thiab molding feem ntau yog tswj cov molding kub, tuag kub faib, thiab lub sij hawm cov khoom dhau los ntawm qhov tuag (pultrusion ceev). Qhov no yog cov txheej txheem tseem ceeb hauv pultrusion molding. Thaum lub sij hawm pultrusion, lub prepreg tau dhau los ua ib qho kev hloov ntawm lub cev, tshuaj, thiab physicochemical hloov thaum nws dhau los ntawm cov pwm, uas tseem tsis paub meej. Kev hais lus dav dav, cov pwm tuaj yeem muab faib ua peb thaj chaw raws li lub xeev ntawm prepreg thaum nws hla dhau. Cov khoom siv txhawb zog dhau los ntawm cov pwm ntawm qhov nrawm nrawm, thaum cov resin coj txawv txawv. Ntawm cov pwm nkag, cov resin coj zoo li cov kua Newtonian; Lub viscous kuj ntawm cov resin thiab pwm lub puab phab ntsa slows nws rau pem hauv ntej tshaj tawm, maj mam rov qab mus rau ib theem piv rau cov fiber ntau raws li qhov deb ntawm lub puab puab nto nce.

 

Raws li lub prepreg txav mus rau pem hauv ntej, nws dhau los ua tus ntoo khaub lig- txuas cov tshuaj tiv thaiv thaum cua sov, nws cov viscosity txo qis, nws cov viscous tsis kam nce, thiab nws pib gel, nkag mus rau hauv thaj chaw gel. Nws maj mam hardens, shrinks, thiab detaches los ntawm pwm. Cov resin txav mus rau pem hauv ntej sib npaug nrog cov fiber ntau ntawm tib lub nrawm. Hauv cheeb tsam curing, nws txuas ntxiv kho nyob rau hauv tshav kub, kom ntseeg tau tias qhov kev kho kom zoo yog tiav thaum demolding. Qhov kub curing feem ntau yog siab tshaj qhov siab tshaj tus nqi ntawm cov exothermic ncov ntawm cov resin, thiab qhov kub thiab txias, gel lub sij hawm, thiab traction ceev yog matched.

 

Lub preheating cheeb tsam kub yuav tsum yog tsawg, thiab qhov kub thiab txias faib yuav tsum tau tswj kom lub curing exothermic ncov tshwm me ntsis tom qab nyob rau hauv nruab nrab ntawm cov pwm, nrog rau cov detachment point tswj nyob rau hauv nruab nrab ntawm cov pwm. Qhov kub sib txawv ntawm peb ntu yuav tsum tswj ntawm 20 thiab 30 degree, thiab qhov kub ntawm qhov ntsuas kub yuav tsum tsis txhob loj dhau. Cov nyhuv ntawm exothermic curing cov tshuaj tiv thaiv kuj yuav tsum tau xav txog. Feem ntau, peb lub tshuab cua sov yog siv los tswj qhov kub ntawm txhua qhov ntawm peb cheeb tsam.

 

Traction quab yuam yog qhov tseem ceeb rau kev ua kom du demolding. Qhov loj ntawm lub zog traction nyob ntawm qhov sib cuam tshuam shear kev nyuaj siab ntawm cov khoom thiab cov pwm. Shear kev ntxhov siab txo qis nrog nce traction ceev, nthuav tawm peb lub ncov ntawm pwm inlet, nruab nrab, thiab qhov hluav taws xob. Lub ncov ntawm lub inlet yog tshwm sim los ntawm cov viscous tsis kam ntawm cov resin ntawm qhov chaw. Nws qhov loj me yog nyob ntawm cov khoom ntawm cov kua nplaum resin, qhov kub ntawm qhov nkag, thiab cov ntsiab lus muab tub lim. Nyob rau hauv cov pwm, resin viscosity txo nrog nce kub, thiab shear stresses txo. Raws li kev kho cov tshuaj tiv thaiv pib, viscosity thiab shear stress nce. Qhov thib ob ncov sib haum mus rau qhov tso tawm taw tes thiab txo qis nrog nce traction ceev. Lub ncov thib peb yog nyob rau ntawm qhov hluav taws xob, tsim los ntawm kev sib txhuam ntawm cov khoom kho thiab cov phab ntsa sab hauv ntawm cov pwm, thiab nws cov nqi yog me me. Traction force yog qhov tseem ceeb heev hauv kev tswj cov txheej txheem. Txhawm rau kom ua tiav cov khoom lag luam du, qhov kev ntxhov siab ntawm qhov chaw tso tawm (lub ncov thib ob) yuav tsum yog me me, thiab cov khoom yuav tsum raug tso tawm ntawm pwm kom ntxov li sai tau. Cov kev hloov hauv traction quab yuam qhia txog cov tshuaj tiv thaiv lub xeev ntawm cov khoom hauv pwm thiab muaj feem xyuam rau cov ntsiab lus fiber ntau, cov khoom zoo thiab qhov loj me, tso tawm tus neeg sawv cev, qhov kub thiab txias, traction ceev, thiab lwm yam.