Repeatable printing paper

A technology for printing paper and paper stock, applied in the field of printing materials, can solve the problems of limited application scope, low contrast and resolution, etc., and achieve the effect of simple process and low cost

Inactive Publication Date: 2016-11-16
BAODING LUCKY FILM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They are all based on the fact that the sprayed white layer becomes transparent when it meets water, and the carbon black layer or the color of the dark base paper realizes the physical property change of water writing

Method used

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  • Repeatable printing paper
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Effect test

preparation example Construction

[0065] In the present invention, the preparation method of described coating liquid preferably comprises the following steps:

[0066] The solvochromic spiro compound dye, organic solvent, water and sizing agent are mixed to obtain a coating solution.

[0067] In the present invention, the coated wet paper is calendered. The invention makes the paper have higher smoothness, glossiness, thickness and uniformity of the paper web through calendering. The present invention has no special limitation on the calendering method, and the calendering technical solution well known to those skilled in the art can be adopted. In the present invention, the required tightness is preferably achieved by pressing the upper and lower rollers during the calendering process, and the paper surface can be modified to a certain extent.

[0068] After the calendering is completed, the present invention preferably rolls the calendered paper, that is, rolls the paper web into a paper roll with a certa...

Embodiment 1

[0073] preparing the pulp to obtain a prepared paper stock; forming, pressing, coating and calendering the prepared paper stock in sequence to obtain reprintable printing paper;

[0074] The coating solution used in the coating includes 0.05g (E)-4-(2-(9,9-dimethyl-7-nitro-2,3,9,9a-tetrahydrooxazoline[3 ,2-a] indole-9a-)vinyl)-N,N-dimethylaniline dyestuff, 50g brand is the silane coupling agent of KH560, 4500g water and 500g styrene ester copolymer sizing agent;

[0075] The thickness of the coating layer was 1 μm.

[0076] The words written on the reprintable paper with a pen or brush dipped in clear water will disappear in 30 hours under the natural environment, and can be reused many times.

Embodiment 2

[0078] preparing the pulp to obtain a prepared paper stock; forming, pressing, coating and calendering the prepared paper stock in sequence to obtain reprintable printing paper;

[0079] The coating solution used in the coating includes 0.06g (E)-4-(2-(9,9-dimethyl-7-nitro-2,3,9,9a-tetrahydrooxazoline[3 ,2-a] indole-9a-)vinyl)-N,N-dimethylaniline dye, 100g brand is the silane coupling agent of KH560, 5000g water and 600g styrene ester copolymer sizing agent;

[0080] The thickness of the coating layer was 4 μm.

[0081] The reprintable paper is printed with an inkless waterjet printer, uses an acetic acid solution with a pH value of 4 as the printing color developer, and prints the font No. 5. Under the natural environment, it will disappear after 50 hours and can be reused many times.

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Abstract

The invention provides a kind of reprintable paper, which is prepared by the following preparation method: pulp is prepared to obtain modulated paper material; the modulated paper material is sequentially formed, pressed, coated and calendered to obtain reprintable paper Paper; the coating solution used in the coating includes solvochromic spiro compound dyes, organic solvents, water and sizing agents. The reprintable paper provided by the invention includes a solvochromic spiro compound dye, which can display desired characters or patterns when exposed to water or an acidic color developer, and the characters or patterns will disappear after a certain period of time, so that the characters or patterns can be reused. Experimental results show that: for the printing paper of the present invention, when water is used as the color developer, the color development time is 10min to 30h; when an acid solution is used as the color developer, the color development time is 30min to 100h. The preparation method of the present invention is simple in process, and can be obtained by adding dyes to the surface sizing step of a mature papermaking process, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of printing materials, in particular to a reusable printing paper. Background technique [0002] Traditional writing paper is disposable, and the writing on it cannot be erased or reused. People writing drafts, copying exercises, etc. will inevitably waste a lot of paper. Disposable writing paper or printing paper is seriously wasted. From the perspective of environmental protection and resource reuse, paper recycling is particularly important. [0003] At present, there are also a large number of reusable water-colored water writing papers on the market, but the existing water writing papers are all composed of paper base, carbon black layer and sprayed white layer or directly composed of dark base paper and sprayed white layer . They are all based on the fact that the sprayed white layer becomes transparent when it encounters water, and the carbon black layer or the color of the dark base paper realizes...

Claims

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Application Information

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IPC IPC(8): D21H27/00D21H21/28D21H21/16D21H19/14D21H21/14B41M5/42
CPCD21H27/00B41M5/423D21H19/14D21H21/143D21H21/16D21H21/28
Inventor 卢志凯李建平黄海水王洪泽高学军王肖鹏张晓安盛兰
Owner BAODING LUCKY FILM
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