Spool ndi mtundu wa kuyika kwa chitoliro komwe kumagwiritsidwa ntchito panthambi ya payipi.Spool imagawidwa mu mainchesi ofanana ndi awiri osiyana.Malekezero a spools ofanana m'mimba mwake onse ndi ofanana;Kukula kwa mphuno ya chitoliro cha nthambi ndi yaying'ono kuposa ya chitoliro chachikulu.Pogwiritsa ntchito mapaipi opanda msoko kuti apange ma spools, pali njira ziwiri zomwe zimagwiritsidwa ntchito nthawi zambiri: hydraulic bulging ndi hot pressing.The dzuwa ndi mkulu;makulidwe a khoma la chitoliro chachikulu ndi mapewa a spool akuwonjezeka.Chifukwa cha kuchuluka kwa zida zomwe zimafunikira kuti pakhale hydraulic bulging process of seamless spool, zida zopangira zomwe zimagwiritsidwa ntchito ndizomwe zimakhala ndi chizoloŵezi cholimba chozizira kwambiri.