Composite kraft paper manufacturing process

Abstract

The invention discloses a composite kraft paper manufacturing process. Composite kraft paper consists of a face layer and a bottom layer. The composite kraft paper manufacturing process includes the steps: (1) selecting softwood pulp and hardwood pulp for preparing face layer pulp, and selecting bamboo pulp and waste paper pulp subjected to half bleaching treatment for preparing bottom layer pulp; (2) preparing the face layer pulp; (3) preparing the bottom layer pulp; (4) enabling mixed face layer pulp to sequentially pass through a fiber dispersion machine and a pulping machine to make the face layer pulp; (5) sequentially subjecting mixed bottom layer pulp to a high-concentration residue removal procedure, a rough screening procedure, a low-concentration residue removal procedure and a pulping procedure to make the bottom layer pulp; (6) feeding the bottom layer pulp onto a paper machine, and then feeding the bottom layer pulp; (7) sequentially performing a dewatering procedure, a drying procedure, a squeezing procedure, a calendaring procedure and reeling. The composite kraft paper manufacturing process has the advantages that the face layer and the bottom layer of the composite kraft paper is made of two different type of raw materials respectively, and pulping and coating for the face layer and the bottom layer are carried out separately, so that mutual influence is avoided; fibers are used in a classified manner, and accordingly utilization rate of the raw materials is increased, and cost is reduced.

Description

technical field [0001] The invention relates to a manufacturing process of composite kraft paper, and belongs to the technical field of papermaking technology. Background technique [0002] Kraft paper is used as packaging material, with high strength, usually in yellowish brown color, semi-bleached or fully bleached kraft pulp in light brown, cream or white, with a basis weight of 80-120g / m 2 , high tear strength, breaking work and dynamic strength, mostly roll paper, and flat paper, using kraft coniferous wood pulp as raw material, after beating, it is made on a fourdrinier paper machine, and can be used as a cement bag paper, envelope paper, plastic-sealing paper, asphalt paper, cable protection paper, insulating paper, etc. [0003] At present, the relatively mature kraft paper production process usually uses kraft wood pulp as raw material, and kraft larch wood pulp is used as raw material. After calendering treatment, the glossiness of the paper sheet is improved and...

AI Technical Summary

Problems solved by technology

[0008] The manufacturing process of kraft paper mentioned above requires many parameters to be strictly controlled, and it is difficult to meet them simultaneously in practical application production, which not only leads to extremely high requirements for equipment and pulp in the production process, but also makes the production cost very high , raising the market circulation price of kraft paper

[0009] After searching, the inventor found that the patent number is 2008100933910, and the patent name is: high-quality kraft paper and its production method. It discloses a method for making kraft paper by using masson pine, Chinese fir, and broad-leaved wood. Although it has achieved good kraft paper performance, the production of kraft paper The cost of raw materials is very high, resulting in a high cost of kraft paper, which is not conducive to the use in many places with low requirements

[0010] After searching, the inventor also found that the application number is 201310246673.0, and the patent name is: water-absorbing kraft paper and its manufacturing process. Water-absorbing kraft paper made of wet strength agent, whitening agent and dispersant, but there are many additives in the kraft paper, resulting in the production of kraft paper in the actual production, which will produce difficult-to-treat wastewater, which is not conducive to clean production