Carbonless copying paper

Abstract

The invention provides digital carbonless copying paper. Curtain coating is carried out on the carbonless copying paper. A coating comprises the following components in parts by weight: 2-5 parts of light calcium carbonate, 5-9 parts of sodium carboxymethyl cellulose, 4-9 parts of styrene-butadiene emulsion, 5-10 parts of polyamine polyepoxy resin, 10-15 parts of melamino-formaldehyde resin, 11-14 parts of styrene-acrylic copolymer, 10-18 parts of carboxylic butadiene-styrene latex, 1-3 parts of sulphonated castor oil, 7-16 parts of sodium polyacrylate, 12-18 parts of polyvinyl alcohol, 1-5 parts of kaolin, 1-4 parts of corn starch, 1-3 parts of pigment, 4-7 parts of emulation, 3-5 parts of argil, 5-12 parts of titanium dioxide and 4-12 parts of talcum powder. According to the invention, after the technical measures are adopted, as the digital carbonless copying paper parts can be automatically separated and leaves of each paper part are firmly bonded, requirements of clients are satisfied.

Description

technical field [0001] The invention relates to carbonless copy paper produced in the papermaking industry. Background technique [0002] Before the present invention was proposed, the use of digital carbonless copy paper did not require plate making like ordinary printing, which reduced the society's demand for rubber plates and further reduced the demand for oil. Due to the adoption of the curtain coating chemical coating process, in order to maintain the continuity of the curtain, a certain amount of surfactant needs to be added to reduce the surface tension of the coating, satisfy the continuous operation of the coating machine, and maintain the continuous production . At the same time, the addition of surfactants also reduces the contact angle of the paper surface and enhances the hydrophilicity. The penetration of the glue on the paper surface will be higher than that of other papers. If the knot strength is too high, it becomes very difficult; and the bond strength ...

AI Technical Summary

Problems solved by technology

At the same time, the addition of surfactants also reduces the contact angle of the paper surface and enhances the hydrophilicity. The penetration of the glue on the paper surface will be higher than that of other papers. If the knot strength is too high, it becomes very difficult; and the bond strength between the pages inside each copy is not enough, so they cannot be well bonded to each other, but become easy to separate