Workmanship of white flour craft paper wrapping type padding

Abstract

The invention relates to workmanship of white flour craft paper wrapping type padding, and the workmanship comprises the steps of (1) adding constantly cationic starch and water in calcium carbonate paste, stirring constantly in the adding process until uniformly mixed paste of calcium carbonate and cationic starch is formed; (2) transferring the paste to a pressure kettle and conducting heating, adding water gradually in the process of heating to meet the needs of the cationic starch gelatinization, wherein the air pressure in the pressure kettle is at least 1.2 times above that of the standard atmospheric pressure; (3) transferring the mixture to a spray drying device when the starch in the step (2) is entirely gelatinized, then the powder prepared through spray drying is the padding. Adopting high pressure method to gelatinize the cationic starch can reduce effectively the molecular weigh of the gelatinized cationic starch, guarantee that the gelatinized cationic starch can more sufficiently wrap the calcium carbonate, further increase the combining ability of calcium carbonate with fibers, and reduce the wastage rate of calcium carbonate.

Description

technical field [0001] The invention relates to a method for making paper-making fillers, in particular to a manufacturing process for white flour kraft paper-wrapped fillers. Background technique [0002] At present, there is a serious shortage of paper fiber raw materials at home and abroad. Fillers, with their abundant raw material resources, low price and excellent optical properties, partially replace fibers and become a component of paper materials. Adding filling can improve the drainage performance of pulp and the drying rate of paper sheets, which can increase the speed of paper machines to a certain extent, save drying energy consumption, and reduce papermaking costs. In addition, filling can also improve the opacity, whiteness and printability of the finished paper. [0003] Traditional fillers and filling methods will reduce the bonding strength between fibers in the slurry, and the strength performance of the filled paper will often be reduced. Filling will al...

AI Technical Summary

Problems solved by technology

[0005] The white flour kraft cardboard filler in the prior art uses cationic starch to wrap calcium carbonate, which has the following problems: cationic starch has a poor binding effect with calcium carbonate due to too large a molecular chain, resulting in the loss of calcium carbonate, and at the same time, the filler is gelatinized due to starch It is not easy to preserve (starch is easy to age or deteriorate), so it is used up in a short time after preparation. This situation limits the use conditions, and requires a filler that is easy to preserve and configure.