Lub evolution ntawm lub khob ntawv tau nthuav tawm nyob rau hauv plaub theem:
Conical / Pleated Paper Cups: Cov khob ntawv ntxov tshaj plaws yog conical hauv cov duab thiab xuas tes ua; lawv tau tuav ua ke los ntawm cov nplaum, nws tuaj yeem sib nrug, thiab yuav tsum tau siv tam sim ntawd. Tom qab ntawd, pleated ntawv khob tau qhia; ntxiv pleats rau lub sidewalls nce lub zog thiab durability. Txawm li cas los xij, cov qauv luam tawm ntawm cov pleated saum npoo no tau ua pov thawj nyuaj thiab tau txais txiaj ntsig zoo tshaj plaws.
Ciab-Coated Paper Cups: Hauv xyoo 1932, thawj ob -dawb daim ntaub-coated ntawv khob tau qhia. Nws du nto tso cai rau luam ntawv ntawm exquisite qauv, yog li pab txhawb kev txhawb nqa. Wax txheej tau ua haujlwm ntau lub hom phiaj: nws tiv thaiv kev sib cuag ncaj qha ntawm cov dej haus thiab cov ntawv, tiv thaiv cov nplaum nplaum los txhim kho kev ua haujlwm ntev, thiab nce phab ntsa thickness -ua kom lub khob muaj zog heev. Qhov no tso cai rau txo cov ntawv siv hauv kev tsim cov khob khov kho, yog li txo cov nqi tsim khoom. Thaum wax-coated khob tau dhau los ua tus qauv rau cov dej haus txias, kuj tseem muaj kev thov rau lub nkoj yooj yim rau cov dej kub. Txawm li cas los xij, cov dej haus kub ua rau cov txheej hauv cov quav ciab yaj thiab cov nplaum nplaum sib cais, ua cov khoom siv quav ciab-coated khob tsis haum rau cov kua dej kub.
Ncaj-Walled Ob- Txheej khob: Txhawm rau nthuav dav ntau yam ntawm cov ntawv thov, ncaj- phab ntsa ob- txheej khob ntawv tau tsim tawm hauv xyoo 1940. Cov khob no tsis yog siv tau xwb tab sis kuj haum rau cov dej kub. Cov neeg tsim khoom tom qab siv cov latex txheej los npog lub "khoom noj khoom haus" ntawm daim ntawv thiab ntxiv dag zog rau kev tawm tsam. Ib leeg- txheej ciab-coated khob kho nrog latex tau dav siv rau kas fes kub hauv tus kheej- kev pabcuam vending machines.
Polyethylene-Coated Paper Cups: Cov tuam txhab noj zaub mov tau pib txheej txheej ntawv nrog polyethylene los txhim kho qhov thaiv thiab kev sib khi ntawm cov ntawv ntim. Vim hais tias polyethylene muaj qhov melting point ntau dua li siv quav ciab, lub khob haus dej tshiab no yog qhov zoo tagnrho rau cov dej haus kub, daws cov teeb meem zoo los ntawm cov khoom siv txheej txheej. Nyob rau tib lub sijhawm, cov txheej txheem polyethylene yog smoother dua li cov ntaub ntawv qub, txhim kho cov tsos ntawm daim ntawv khob. Tsis tas li ntawd, txoj kev ua yog pheej yig dua thiab sai dua li cov txheej latex.