Lub tshuab nqus tsev sib sau tshuab ntsug Txhaj Moulding Tshuab Pwm Kub

Lub tshuab nqus tsev sib sau tshuab ntsug Txhaj Moulding Tshuab Pwm Kub

Cov pwm kub muaj qhov cuam tshuam rau qhov zoo ntawm cov khoom siv tes ua. Nws xaiv nyob ntawm seb cov polymer yog crystalline, specifications thiab qauv ntawm cov khoom siv tes ua, cov yam ntxwv yuav tsum tau, thiab lwm yam kev txhaj tshuaj (melt kub, txhaj tshuaj npaum li cas thiab ua hauj lwm siab, molding voj voog), thiab lwm yam.

Rau non-crystalline bulk polymers, pwm kub feem ntau cuam tshuam rau viscosity (fluidity) ntawm cov tshuaj.

Yog tias cov tshuaj viscosity ntawm cov khoom siv raw yog qis, xws li Ps, pwm kub tuaj yeem qis dua me ntsis los txhim kho cov zis tawm. Yog tias qhov viscosity ntawm cov tshuaj yog siab, (xws li mPPE, PSF), siv cov pwm pwm ntau dua: mPPE yog 120 degree ~ 140 degree, PSF yog 140 degree ~ 130 degree.

Nqus molding tshuab ntsug txhaj molding tshuab nozzle kub

Txij li thaum cov khoom kub ntawm cov yaj yuav nce ntxiv nrog kev nthuav dav ntawm kev txiav ceev (txog 103 - 102) raws li lub nozzle, lub nozzle kub yog me ntsis qis dua qhov kub ntawm lub thoob, tab sis yog tias nws qis heev, kev txhaj tshuaj siab yuav nthuav dav, lossis Ua rau thaum ntxov coagulation ntawm cov khoom siv raw, cuam tshuam rau cov khoom siv tes ua zoo.

Txij li thaum muaj ntau yam cuam tshuam rau lub fluidity ntawm polymers, feem ntau, ua ntej tsim, kev hloov kho yog ua raws li "kev txhaj tshuaj" los yog "kev tsom xam txoj kev ntawm cov khoom siv tes ua", thiaj li yuav paub meej tias qhov kub ntawm lub chim ntawm ntsug txhaj tshuaj. molding tshuab los ntawm cov ntawv nyeem. thiab nozzle kub.

Nqus txoj kev tshuab ntsug txhaj molding tshuab chim kub

Kev xaiv ntawm lub chim kub ntawm ntsug txhaj tshuaj molding tshuab muaj feem xyuam rau cov yam ntxwv ntawm cov yas, tshwj xeeb tshaj yog cov fluidity kub (Τf) los yog melting point (Τm) ntawm cov yas.

Rau amorphous plastics, qhov kub ntawm qhov kawg ntawm lub thoob yuav tsum siab tshaj Τf, thaum lub crystalline plastics yuav tsum siab tshaj Τm, tab sis qhov kub ntawm cov yas yuav tsum tsawg tshaj li qhov kub dissolution (Τd) ntawm cov polymer. . Yog li ntawd, qhov kub zoo ntawm lub thoob yuav tsum nyob nruab nrab ntawm Τf lossis Τm - Τd.

Rau cov yas uas muaj qhov nqaim ntawm Τf lossis Τm-Τd, xws li PVC, pom, thiab lwm yam, qhov kub ntawm lub thoob yuav tsum qis dua me ntsis. Rau cov yas uas muaj ntau yam dav, xws li pE, APP, thiab lwm yam, qhov kub ntawm lub thoob tuaj yeem siab dua me ntsis. Tsis tas li ntawd, kev tiv thaiv tshav kub, cov ntsiab lus thiab kev faib tawm ntawm cov yas, cov khoom ntim thiab cov khoom siv ntxiv, cov khoom siv tes ua thiab cov pwm txhaj tshuaj, thiab lawv cov khoom siv txhaj tshuaj yuav tsum tau txiav txim siab. Cov thoob tau faib ruaj khov, thiab cov nozzles feem ntau maj mam nce los ntawm qhov pib thiab qhov kawg ntawm lub silo, kom qhov kub ntawm cov ntaub ntawv raw yog sib npaug mus rau lub hom phiaj ntawm cov yas zoo tib yam.

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