RU2081230C1 - Method of preparation of paper-making stock for paper production - Google Patents

Abstract

FIELD: wood-pulp and paper industry. SUBSTANCE: the essence of the offered method consists in magnetic treatment of polymer solution before its introduction into composition basin. In so doing, polymer macromolecules are turned into linear chain along the lines of magnetic induction to increase its system length. Due to it, number of points of polymer contact with cellulose fibers increases, and, as a result, efficiency of polymer utilization rises, and its consumption drops and mechanical parameters of produced paper improve. After composition basin, paper-making stock is supplied for paper sheet formation. EFFECT: higher efficiency. 2 dwg

Description

 The invention relates to pulp and paper production, namely to the manufacture of paper with enhanced mechanical properties.

 A known method of preparing paper pulp, including grinding fibrous semi-finished products and the preparation of a polymer solution in the composition, and the polymer solution is prepared in an emulsifier. The polymer solution prepared in the emulsifier consists of a liquid phase and macromolecules dissolved in it. The macromolecules have a convoluted structure (in the form of Gaussian coils), which reduces the number of “points” of contacts between the functional groups of the polymer and the hydroxyl groups of cellulose fibers. This leads to increased polymer consumption and adversely affects the formation and mechanical properties of the paper.

 The technical problem to which the invention is directed is to increase the efficiency of using a polymer solution and improve the mechanical properties of the paper produced.

 This problem is solved due to the fact that the polymer solution is treated with a magnetic field before being introduced into the composite pool. In this case, the polymer macromolecules unfold in a linear chain along the lines of magnetic induction, increasing its porsystem length. Due to this, the number of points for contact of the polymer with cellulose fibers increases, and, consequently, the efficiency of use of the polymer increases, its consumption decreases, and the mechanical indicators of the paper produced increase.

 In FIG. 1 shows a schematic diagram of the preparation of paper pulp; figure 2 emulsifier with a device for processing a constant magnetic field.

 After turning on the device, the method is as follows.

 Take fibrous prefabricated / for the manufacture of newsprint 25% sulfite pulp and 75% wood pulp / and produce grinding in a disk mill / type MF /. Then the mass is fed into the composite pool / 1 /. At the same time, in a emulsifier equipped with an electromagnet coil mounted on the outlet pipe (Fig. 2), a polymer solution / polyacrylamide / with additive / copper complex compounds / is prepared to improve the paramagnetic properties of the solution. After this, the prepared paper pulp is fed into the composite pool and then to the ebb and molding of the paper web.

 When studying the properties of paper pulp, empirical curves were constructed of the dependence of the breaking length of the castings on the magnetic field strength, which had a peak character, for example, for polyacrylamide, the maximum breaking length in the strength range of 40-60 T with an unchanged amount of added additive. This method of preparation of paper pulp allows to reduce the consumption of polycrylamide by about 50-60 kg / t of pulp and increase the breaking length of the paper by about 1.3 times.

Claims (1)

 A method of preparing paper pulp for making paper, in which the fibrous material is milled to obtain pulp, a polymer solution in an emulsifier is prepared, then the resulting pulp and the prepared polymer solution are simultaneously fed into the composition pool to formulate the composition, characterized in that the solution prepared in the emulsifier polymer before feeding it into the composite pool is treated with a constant magnetic field.

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