Method for preparing biomechanical pulp from wheat straw sheath

Abstract

The invention provides a method for preparing biomechanical pulp from wheat straw sheath. The method comprises the following steps: S1, cutting the pretreated wheat straw sheath section into segments,and treating by means of action of warm water and alkaline complex enzyme; S2, adding hot water into the wheat straw sheath treated in the step S1 for performing saturation softening treatment; S3, grinding the wheat straw sheath, subjected to the softening treatment in the step S2, into thick liquid to prepare the biomechanical pulp. The wheat straw sheath is used as a raw material for the firsttime, and the high-yield primary color biomechanical pulp is prepared by using a hot water combined alkaline complex biological enzyme process, so that the requirements of producing primary color packaging paper and paper-based materials are reached. The preparation method provided by the invention is simple, green, environment-friendly and energy-saving, conforms to the national industrial policy of resource conservation, economic cycle, energy conservation and emission reduction, and can generate good social, economic and ecological benefits, thus having good practical application value andindustrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of papermaking technology and new materials, and in particular relates to a method for preparing biomechanical pulp from wheat straw sheaths. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] In 2016, my country's pulp imports reached 21.06 million tons, and waste paper imports reached 28.5 million tons. The import dependence of paper fiber raw materials was close to 50%. The large amount of waste paper made up for the gap in my country's fiber raw materials and supported the development of the paper industry. In April 2017, the central government issued the "Implementation Plan on Prohibiting the Entry of ...

AI Technical Summary

Problems solved by technology

[0004] In the traditional papermaking process in the past, wheat straw was used as an important papermaking raw material, and the wheat straw leaf sheath in the wheat straw is often required to be removed as much as possible during the material preparation process. Hemicellulose, but very hard to beat

Specifically, because the fibers in the wheatgrass sheath are short, and the content of miscellaneous cells is high, the outer layer of the secondary wall is thicker, and it is tightly bonded to the middle layer of the secondary wall, so it is difficult to remove during the beating process, thus causing the fiber to be broken. Swelling and fibrillation are very difficult

If excessive fine fiberization is required in beating, it will inevitably cause excessive cutting of fibers, which not only affects the strength of paper, but also makes it difficult to filter water during papermaking.

However, removing the wheat straw sheath not only increases the cost of material preparation, but also greatly reduces the utilization rate of wheat straw raw materials

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