KR850001412B1 - Method for preparing paper board - Google Patents

Abstract

This manufacturing process uses a solution treatment with a 60-80% zinc chloride water solution at 40-80≰C for 1-10 min. which passes 1- 15 sheets of original paper to a zinc chloride precipitating box. The paper is hot rolled at 30-50≰C and simultaneously cut. It is then placed in the remaining treatment for 24 hours, washed gradually from the higher concentration zinc chloride water solution to a lower concentration zinc chloride water solution, dried in a rotating drying oven at 80-120 ≰C, pressed at 102-104 kg/cm2 pressure, cut and worked.

Description

Method of manufacturing

1 is a process chart of the manufacturing method of the divided type.

2 is a process chart of a semi-continuous dog manufacturing method.

3 is a flow chart of a continuous method of manufacturing.

The present invention is a method of producing a paper (crosslinked fiber) by immersing the paperboard paper (hereinafter referred to as the base paper) prepared by the general method with the main component of the plant fiber in a zinc chloride aqueous solution, followed by washing with water, drying and pressing with a heat press. It is about. As a method of preparing the gel by reacting the base paper with a crosslinking agent of zinc chloride or sulfuric acid, the physical and chemical properties such as chemical resistance, impact resistance, flex resistance, hardness, specific gravity, and strength are greatly improved.

The conventional method of manufacturing the cotton was immersed in zinc chloride, sulfuric acid, aluminum chloride aqueous solution, etc., but due to insufficient water during washing, the residue remains or dried naturally due to difficulties in the facility when it is dried. There is a phenomenon that the blister occurs due to the lack of technology, and there is a phenomenon that it is lifted up between the papers.

In order to solve the above problems, the present invention is sufficiently dried with hot air or heating rolls, and gradually dilutes the concentration of zinc chloride and washes to prevent blistering due to osmotic pressure from the difference in concentration and to enable continuous operation. In addition to improving the conventional process, the raw materials made it possible to use cotton pulp paper as well as cotton linter paper.

Cellulose is a main component of cotton linter and high-purity wood pulp. It has been used as a product of paper, film, fiber, etc. by using cellulose. Cellulose acetate, cupraammonium made by chemical reaction with cellulose And cellulose show good performance as a dialysis membrane. Also, many researches have been made on graft copolymers prepared by polymerizing cellulose and vinyl monomers, and cellulose has a structure of polysaccharide.

Cellulose has a hydroxyl group (-OH) and is well soluble in strong solvents. In the dry state, hydrogen bonds between cellulose and cellulose molecules to show strong physical properties.However, when moisture is present, cellulose-cellulosic hydrogen bonds are dropped and hydrogen bonds between cellulose and water are changed. Swelling. At this time, when cellulose is treated with sulfuric acid or zinc chloride, valcanization, ie, cellulose molecules are crosslinked, thereby greatly improving physicochemical performance.

In view of the above, the present invention has been accomplished by impregnating a cellulose-based raw material in a zinc chloride aqueous solution to produce a method of preparing a valcanized fiber. The raw material of the production (hereinafter referred to as raw paper) mainly uses cotton fiber or wood pulp. The base should be cellulose, cellulose or other impurities free of cellulose. The properties required for the base paper should be small in the difference between the front and back or the length and width, and have good swelling ability with zinc chloride. Since the shrinkage and density change according to the strength and reaction degree of the paper, the strength of the support varies greatly according to the natural strength of the paper. Therefore, the way that the raw pulp is not damaged is good. In addition, if the moisture of the base paper is low reactivity, the moisture content should be reduced.

Zinc chloride is used in water at a concentration of around 70% and can be recovered and used again. Impurities may include NH ₄ ⁺ , Ca ⁺⁺ , Fe ⁺⁺ , which may be included in the zinc chloride raw material or may be introduced during the reuse process. The acidity of zinc chloride is one of the important points of manufacturing. If alkaline, the precipitate of zinc hydroxide (Zn (OH) ₂ ) adheres to the base when diluted in hydrogen, causing contamination and is difficult to remove. If the acid is strong, it will damage the base and reduce the product strength. Complemented by this method, the physicochemical properties are significantly improved than the original paper. Tables 1 and 2 show the average values of the physical properties of the specimens prepared in the divisional, semi-continuous, and continuous form according to ASTM standards.

TABLE 1

Physical properties of the structure manufactured by division type, semi-continuous type and continuous type

TABLE 2

Ash, Sio ₂ , Zncl ₂ content analysis table of each sample

Example 1

As a separate manufacturing process as shown in FIG. 1, the paper is passed through a 10-minute dip paper at 40-80 ° C with zinc chloride at a concentration of 65-75%, and wound up to 5-20 sheets. When the desired thickness is cut, it is cut for 24 hours in the air, and the remaining zinc chloride is washed with water to completely remove it, then dried for 2-3 hours in a drying furnace at 60-90 ° C., at a temperature of 100-150 ° C. and 10 ² -10 ⁴ kg / ㎠ Press pressure at the pressure of the press and then cut to obtain a thickness of 1.5-10mm.

Example 2

In the semi-continuous manufacturing process, 1-15 sheets of paper were simultaneously passed through a 40-80 ° C zinc chloride dip immersing container at a concentration of 60-80% as shown in FIG. 2, and then pressed with a roller heated to 30-50 ° C. While cutting, excess for 24 hours. If the concentration is gradually washed with dilute aqueous zinc chloride solution, it is finally washed with water. After washing with water, it is dried in a rotary drying furnace at 80-120 ℃, compressed into a press at a pressure of 10 ² -10 ⁴ kg / ㎠, and cut. The holding thickness at this time is about 1-2 mm.

Example 3

As a continuous manufacturing process as shown in FIG. 3, 1-15 sheets of paper were immersed together in an aqueous zinc chloride solution, and then passed through a 30-60 ° C. known solution for 15-30 minutes. Wash with zinc chloride solution and wash with water in the final step. Pass through the roller at a temperature of 70-150 ℃, dry it, compress it in the roller, and shape it.

Claims (2)

In 1-10 minutes treatment at 40-80 ° C with an aqueous solution of 60-80% zinc chloride, 1-15 sheets of paper were simultaneously passed through a zinc chloride immersion bin and pressed while cutting with a roller heated to 30-50 ° C. After surplus for 24 hours, the mixture was washed with concentrated zinc chloride aqueous solution from gradually concentrated zinc chloride aqueous solution, and then with water, and then dried in a rotary drying furnace at a temperature of 80-120 ° C. and a pressure of 10 ² -10 ⁴ kg / ㎠ Method of manufacturing the pressing and cutting process. According to claim 1, 1-15 sheets of paper are immersed together in an aqueous zinc chloride solution, and then passed through 30-60 ° C. air for 15-30 minutes, surplus by severity, washed gradually with an aqueous solution of zinc chloride, and then washed with water. And passing through a roller at a temperature of 70-150 ° C., followed by drying and compression molding.

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