Self-adhesive labels are also called post-it notes, self-adhesive labels. It is a kind of composite material with paper, film or special material as the surface, the back is coated with adhesive, and the silicon protective paper as the base paper.
Carbon-free paper is divided into upper paper, middle paper and lower paper. On the next side of the upper and middle pages, a certain drug is applied, and on the upper side of the middle and next pages, another chemical is applied. After combining in the order of the upper, middle and lower pages, when affected by the impact of the printing needle or the pressure of the pen tip, two different drugs will meet and show wonderful trace to achieve the purpose of copying.
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