Paper surface electrostatic painting process and special high pressure electrostatic painting system therefor

Abstract

The invention discloses a paper surface electrostatic spraying technology which includes the following steps: (1) a working electric field is firstly established and connected with a negative high voltage electrode by a spray gun to form a high voltage negative electrode; a metal plate is additionally made to form a positive electrode after grounding; (2) spraying coating is prepared; and (3) paper is caused to move clinging to a positive metal plate in an electric field formed by two electrodes. The spraying coating is input into the spray gun and charged coating particles sprayed from the spray gun move to the positive metal plate under the action of a high-voltage electric field and are accepted by the paper and then deposited on the surface of the paper to form a coating layer. In addition, the invention also discloses a specific high-voltage electrostatic spraying system of the technology. The technology and the system of the invention can realize the coating of pigment with comparatively large particle size and the prepared paper has good glossiness, good scintillation effect, high utilization rate of the coating, uniform and smooth coating surface, and little fly ash, thereby being applicable to bulk production.

Description

technical field [0001] The present invention relates to a coating process on the surface of paper, in particular to an electrostatic spraying process on the surface of paper, which can also be used for surface coating of non-conductive coils (such as fabrics, thin films, etc.); in addition, the present invention also relates to High-voltage electrostatic spraying system dedicated to the above process. Background technique [0002] Coating the surface of paper with new effect materials (such as pearlescent powder, glitter powder, etc.) can add artistic effects to the surface of paper. At present, the most widely used method is to use pearlescent powder to coat the surface of paper to produce pearlescent paper. [0003] The specific coating process is to add a certain amount of pearlescent powder to the resin to prepare the pearlescent coating, and use the gravure printing method to coat and print the paper surface. The process is characterized by accurate coating quantity, h...

AI Technical Summary

Problems solved by technology

However, although the effect of pearl powder with a particle size greater than 100um is good, it cannot be applied due to the size of the cavity space of the coating gravure roller (generally, the depth of the cavity of the gravure roller is within 30um)

Therefore, according to the coating method in the existing paper processing, it is difficult to coat the decorative pigment with larger particle size on the paper, and the shimmering effect of the produced pearlescent paper is not satisfactory.

Therefore, we thought of using the method of spraying. After testing, it was proved that the method of spraying can be used to achieve the coating of larger particle size pigments. There is a lot of flying dust and cannot be mass-produced. Therefore, it is necessary to study a spraying process to overcome the above problems

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