Kub suab paj yog ib qho tseem ceeb ntawm cov khoom tseem ceeb hauv cov khoom siv siab, raws li nws pab txhim kho cov khoom siv lub zog, elasticity, thiab tag nrho zoo. Cov txheej txheem cuam tshuam nrog kub yaj polymer, feem ntau yog cov khoom siv thermoplastic zoo li polyester, kom ua kom haum rau nws cov khoom siv neeg kho tshuab. Thawj kauj ruam ntawm daim duab kub yaj cov xov paj yog kom extrude cov polymer los ntawm cov spinneret los ntawm kev sib sau cov filaments nplua. Cov filaments no yog tom qab ntawd rhuab rau ib qho kub nyob hauv qab lawv cov lus me me kom ntseeg tau tias lawv yog qhov muag txaus tab sis tsis kub heev uas lawv poob lawv cov duab.
Thaum cov paj las mus txog qhov xav tau qhov xav tau, nws yog kos duab (lossis ncab) los ntawm cov rollers ntawm kev tswj ceev. Daim duab kos txheej txheem elongates cov fibers, nce lawv cov kev cob qhia raws qhov ntev ntawm cov xov paj. Cov txheej txheem no txhim kho lub zog tensile thiab modulus ntawm cov paj, ua kom muaj zog thiab ntau ruaj khov. Qhov ntau ntawm kev kos duab thiab qhov nrawm ntawm cov xov paj yog kos yog qhov tseem ceeb hauv kev txiav txim siab cov khoom kawg ntawm cov xov paj.
Tom qab kos duab, cov xov paj yog txias sai sai rau lub xauv nyob rau hauv cov tshiab molecular dlhos, thiab nws yog ces lub qhov txhab rau cov nqaij mos rau kev ua haujlwm ntxiv lossis siv. Kev tswj kom zoo ntawm qhov ntsuas kub, kos duab ceev, thiab nro hauv cov txheej txheem no yog qhov tseem ceeb kom paub meej cov xov xwm zoo thiab kev ua tau zoo. Cov khoom kawg yog feem ntau hloov tau yooj yim, muaj zog dua, thiab muaj zog rau ntau yam kev ntxhov siab hauv textiles, thiab lwm yam kub yaj xov cov xov paj.
