Mechanical method for making pulp by extruding sunflower stems

Abstract

The invention relates to a mechanical method for making pulp by extruding sunflower stems, belonging to the field of paper making and aiming to provide a method for preparing paper making pulp by taking the sunflower stems as raw materials. Severed sunflower stems are firstly delivered into a vertical type depithing machine to carry out depithing by a half wet method and then washed to carry out depithing by a wet method, then the severed sunflower stems are steamed and then enter a twin-screw extrusion impregnating machine, slag charge sheets are extruded and grinded into mass-shaped rough pulp and also impregnated and absorbed by NaOH inside the twin-screw extrusion impregnating machine, the mixed rough pulp enters a reaction chamber to be continuously reacted and then enters a high-concentration attrition mill to mill the rough pulp into highly-concentrated pulp, and the milled pulp is delivered into a latency chest to be diluted, stayed and stirred and finally enters a screw pressdewaterer to carry out screw type press and dewatering and extrude finished pulp. The invention has the advantages of low-energy consumption, no pollution, low water consumption (ton paper / 10 tons ofwater), high intensity, high yielding rate and high benefit.

Description

Technical field: [0001] The invention belongs to the field of papermaking. Background technique: [0002] Sunflower stalk is an annual growth plant, the content of cellulose is about 76%, the content of polypentose is about 19%, and the ratio of stalk to pith is 89:11. Sunflower stalk fibers are relatively uniform, 0.5-1.0mm fibers account for 50-60%, easy to moisten and swell when beating, and the pulping strength is better than ordinary stalk fibers, and the fiber quality belongs to the general broad-leaved wood category. [0003] The xylem of sunflower stalks contains components such as fiber cells, vessel molecules, wood ray cells and wood ray parenchyma cells. The content of miscellaneous cell components is high. These miscellaneous cell components have different shapes and small sizes, which not only affect the The fiber quality of the pulp is high, and it is easy to lose during the pulping and washing process, so the pulping yield will be reduced. [0004] The volum...

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Problems solved by technology

[0003] The xylem of sunflower stalks contains components such as fiber cells, vessel molecules, wood ray cells and wood ray parenchyma cells. The content of miscellaneous cell components is high. These miscellaneous cell components have different shapes and small sizes, which not only affect the The fiber quality of the pulp, and it is easy to lose during the pulping and washing process, so it will reduce the pulping yield

[0004] The volume of myeloid cells in the core of sunflower stalks accounts for more than 50% of the whole plant volume, and the main components of the ashes of the marrow cells are inorganic minerals such as Ca and Si. Regardless of making chemical pulp or chemical mechanical pulp, this component not only consumes Pulp chemicals, but also affect the pulp quality

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