Keeb kwm khob

Waxed ntawv khob

Hauv 1932, tus thawj waxing tsuas tawm tuaj ob daim ntawv khob haus dej, nws nto du yuav tau luam tawm ntau exquisite designs zoo qib zoo heev. Waxed ntawv khob haus dej, ntawm qhov one tes yuav tsum tsis txhob haus cov dej muaj ntawv hu thiab adhesion ntawm lub yas, mus pab tau txoj xauv rau hauv khob ntawv ntxiv mus yuav tsub kom lub thickness ntawm sab phab ntsa, ua ntawv khob zog heev zoo tuaj, yog li kom daim ntawv tsim nyog los manufacture lub khob haus dej khov kho ntawv thiab kev txo nqi ntau lawm.

Coj ncaj phab ntsa khob

Tsim cov ntaub ntawv ntau hom ntawv khob haus dej, hauv 1940, coj ncaj phab ntsa ntawv khob lag luam. No khob yog tsis zoo xwb yooj yim, tab sis tseem rau cov uas muaj dej kub. Txij thaum ntawd los, manufacturers rau cov iav coated nrog cov txab yuav muab daim ntawv uas muaj cov "duab los qhia", thiab has rau ntawv khob leakproof. Ib txheej bacteria yas txheej ciab coated iav yog lug siv hauv nyias vending cav tov los muaj kub kas fes.

Laminating coated ntawv yas khob

Tej zaub mov tuam txhab uas muag polyethylene coated duab los qhia, yuav ua rau kom tus ntawv barrier thiab sealing. Vim lub yig tshaj ntawd dua lub melting cheej nyob ntawm polyethylene ciab, siv tau yam tshiab ntawm cov ntaub ntawv coated khob haus dej, haus kub yuav tsis zoo rau tus txais tos, tagnrho solves lub melted txheej cov ntaub ntawv thiab tej teeb meem uas muaj feem xyuam rau cov khoom zoo. Meanwhile, polyethylene txheej ntawm xim tshaj smooth ciab, zoo qhov mob yeej thooj li tus ntawv khob. Tsis tas li, as compared with siv AUTHORIZED ntawm txheej yas yog pheej yig thiab ceev.