Thaum cov ntawv thermal raug kub siab tshaj 70 degree, nws cov thermal txheej pib hloov xim. Yuav kom nkag siab tias yog vim li cas qhov no tshwm sim, ib tug yuav tsum saib nws cov tshuaj muaj pes tsawg leeg.
Cov txheej txheej thermal feem ntau muaj ob yam: cov xim tsis muaj xim (tseem hu ua leuco dye) thiab cov xim tsim tawm. Hom ntawv no yog hu ua ob -cov ntaub ntawv sau cov ntaub ntawv pov thawj tshuaj thermal.
Feem ntau siv cov xim tsis muaj xim muaj xws li cov khoom siv xws li Crystal Violet Lactone (CVL) los ntawm triphenylmethane phthalide system, fluoran-raws li dyes, Benzoyl Leuco Methylene Blue (BLMB), thiab spiropyran-raws li compounds.
Feem ntau siv cov tshuaj dispersing xws li Polyvinyl cawv (PVA) qib L-3266, GL-05, thiab KL-03 (tsim los ntawm Nippon Synthetic Chemical Industry).
Feem ntau siv cov tshuaj ntxiv rau saum thiab hauv paus txheej muaj xws li Gohsefimer Z-200 thiab PVA qib T-350 thiab N-300.
Feem ntau siv cov xim tsim muaj xws li cov khoom xws li p-hydroxybenzoic acid thiab nws cov esters (PHBB, PHB), salicylic acid, 2,4-dihydroxybenzoic acid, thiab aromatic sulfones.
Thaum cov ntawv thermal yog rhuab, cov tshuaj tiv thaiv tshwm sim ntawm cov xim tsis muaj xim thiab cov xim tsim, tsim cov xim; yog li ntawd, thaum daim ntawv siv hauv lub tshuab fax kom tau txais thiab luam tawm cov cim lossis hauv lub tshuab luam ntawv thermal, cov duab thiab cov ntawv yuav tshwm. Vim tias muaj ntau hom xim tsis muaj xim muaj, cov xim luam tawm tuaj yeem sib txawv -ua cov xim xws li xiav, magenta, lossis dub.