Device for coating surface of paper with polyvinyl alcohol

Abstract

The invention discloses a device for coating the surface of paper with polyvinyl alcohol. The device comprises a box body, a motor and paper, wherein the motor is fixedly connected to the upper surface of the top plate of the box body, plural sets of conveying rollers are rotationally connected to the inner side wall of the box body, the output shaft of the motor is in transmission connection withthe conveying rollers through a belt, containing boxes arranged in a staggered manner are fixedly connected to the inner side wall of the box body, a heating drying lamp is arranged on one side of the containing box and fixedly connected to the inner side wall of the box body, a material inlet and a material outlet hole are formed in the side wall of the box body, and the material outlet hole ispositioned on the upper side of the material inlet hole and is parallel to the material inlet hole. According to the invention, with the device, the front surface and the back surface of paper can becoated with polyvinyl alcohol, the drying speed of the polyvinyl alcohol coated on the paper can be increased, the polyvinyl alcohol coated on the paper is prevented from being adhered to the conveying rollers, the coating effect of the polyvinyl alcohol on the paper is guaranteed, and the convenience is brought to workers.

Description

technical field [0001] The invention relates to the technical field of paper processing equipment, in particular to a device for coating polyvinyl alcohol on the surface of paper. Background technique [0002] Paper is mainly composed of plant fibers, which are easy to absorb water and moisture; after the paper absorbs water and moisture, the water molecules will directly destroy the bonding force between the plant fiber molecules, resulting in a decrease in the tensile strength of the paper, which in turn affects the subsequent use of the paper by customers. Especially in high temperature and high humidity environment, the tensile strength of paper drops more obviously. In the paper production process, starch is required to be added to the surface of the paper (starch will not penetrate into the paper), and to a certain extent, starch increases the bonding force between fibers. In order to prevent moisture absorption, solid additives should also be added to reduce the visc...

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Problems solved by technology

[0003] The Chinese invention patent with the notification number CN207347830U discloses a device for coating polyvinyl alcohol on the surface of paper, including a pin and a glue roller, and a pressure roller is arranged next to the glue roller, and the paper passes through the glue roller and the pressure roller The gap between them is pressed tightly on the glue roller by the pressure roller. The rotating shaft of the pressure roller is fixed by the buffer rod, and the holding tray is fixed under the glue roller. Fix the liquid level sensor, the liquid level sensor is connected to the pump through the control system, the output end of the pump is connected to the storage tray, and the input end of the pump is connected to the container for storing polyvinyl alcohol; although the surface of this kind of paper is coated with polyvinyl alcohol device, the cost is low, There is no need to modify the original sizing system, and the sizing is uniform, high reliability, and easy to replace the scraper; but after the paper is coated with polyvinyl alcohol, it usually dries naturally, and the drying speed is relatively slow. When the side covered with polyvinyl alcohol is in contact with the pressure roller, due to the slow drying speed of the polyvinyl alcohol on the surface of the paper, part of the polyvinyl alcohol on the paper adheres to the pressure roller, thus affecting the adhesion of the polyvinyl alcohol on the paper. Coating effect brings inconvenience to the staff, so we propose a paper surface coating polyvinyl alcohol device to solve the above problems

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