WO2020140736A1

WO2020140736A1 - Papermaking method

Info

Publication number: WO2020140736A1
Application number: PCT/CN2019/125461
Authority: WO
Inventors: 何仁城
Original assignee: 深圳市大可奇科技有限公司
Priority date: 2018-12-30
Filing date: 2019-12-15
Publication date: 2020-07-09
Also published as: CN110700003A; CN109594396A

Abstract

Disclosed is a papermaking method, comprising the following steps: smashing fiber raw materials into particles with an average diameter of less than 1000 μm and filaments with a diameter of 1 to 1000 μm; physically filtering the smashed fiber raw materials to remove impurities and sundries therein; modulating proportions of components of raw materials for papermaking and mixing evenly to form a colloidal paste; squeezing the colloidal paste through a gap between two parallel rollers to form a wet paper sheet; dehydrating the wet paper sheet to form a dry paper sheet; and performing cutting and scrap cutting to the dry paper sheet.

Description

Paper making method

Technical field

The invention relates to the technical field of papermaking.

Background technique

Existing papermaking technology. The mechanism is continuous on the paper machine, diluting the pulp suitable for the paper quality to a certain concentration with water, dewatering initially in the wire part of the paper machine to form a wet paper sheet, then dewatering by pressing, and then drying into paper. For handwork, the frame with bamboo curtain, polyester net or copper net is used to copy the fibers dispersed in water into wet paper sheets, which are dehydrated by pressing, and then dried or dried into paper. The biggest difference between machine-made and hand-made paper is that, because hand-made paper is manually beaten, the fibers in the pulp are well preserved; machine-made paper is beaten by machines, and the pulp fibers are broken. This makes handmade paper much better than machine-made paper in toughness. The mechanism paper has a pulp web speed difference, resulting in uneven distribution of fibers in the vertical and horizontal directions, and handmade paper does not have uneven distribution of fibers in the vertical and horizontal directions, which is particularly reflected on calligraphy and painting paper (such as rice paper).

In order to use white paper, the existing papermaking technology generally uses the chemical method of bleaching. The product of this method seriously affects the environment, and a large number of chemical agents are used in paper manufacturing. The use of paper is not safe and environmentally friendly, which is easy to harm. The user's physical and mental health, and the existing paper-making technology adopts the process of reacting in water in order to distribute the fiber evenly, requiring a large amount of water resources, causing waste of water resources, and its products have a serious impact on the environment.

Summary of the invention

The purpose of the present invention is to provide a papermaking method that can save water resources and is environmentally friendly.

The purpose of the present invention can be achieved in this way, designing a papermaking method, including the following steps:

A. Crush the fiber raw materials into particles with an average diameter of less than 1000 μm and filaments with a diameter of 1 to 1000 μm;

B. Physically screen the crushed fiber raw materials to remove impurities and debris;

C. Adjust the proportion of raw materials used to make paper and mix evenly to form a gelatinous dough;

D. Squeeze the gelatinous dough through the gap between two parallel rollers to form a wet paper sheet;

F. Dehydrate the wet paper sheet to form a dry paper sheet;

G. Cut dry paper and waste.

Further, it also includes step E, coloring the wet paper sheet to change its surface to the desired color.

Further, the composition ratio of the raw materials for adjusting the paper manufacturing described in step C includes modulation: the mass content of cellulose is 40%-95%, the mass content of hemicellulose is 2.5%-20%, and the mass content of lignin It is 0-30%, the mass content of the filler is 0-35%, the mass content of the prepared binder is 0-10%, and the average fiber length is 0.5-5 mm.

Further, the viscosity of the gelatinous dough described in step C is 50-1000 Pa·s.

Further, step D includes:

D1. Set two sets of machine rollers placed in parallel;

D2. Squeeze out the gelatinous dough from the gap between two parallel rollers, the gap between the gap is 1μm ~ 5000μm;

D3. The gelatinous dough passes through the above-mentioned gap to form a wet paper sheet, and the humidity of the wet paper sheet is 50% to 70%.

Further, step E includes:

E1. Prepare colored ink or colored adhesive;

E2. Print or spray colored ink or colored adhesive onto the wet paper sheet to form the external color of the wet paper sheet.

Further, the dehydration method described in step F is one or a combination of baking dehydration, press dehydration, and air drying dehydration; the moisture of the wet paper sheet is dehydrated to 5% to 8% to form a dry paper sheet.

Further, step G includes:

G1. Trim and cut the dry paper sheet according to the actual required size;

G2. Cut off the excess edges of the cut paper.

Further, the preparation of the average fiber length: compare the average fiber length of the fiber raw material with the set average fiber length after step B, and then add relatively long fibers or relatively short fibers to the fiber raw material to achieve the set average fiber length.

Further, the pulping method used in step A includes: mechanical energy pulping, chemical and thermal energy pulping, and mechanochemical comprehensive treatment pulping.

Further, the equipment used in step D is a tablet press.

Further, the fiber raw material in step A is one of stem fibers, bast fibers, seed wool fibers, and wood fibers, or a combination thereof.

Further, the screening method used in step B is one of a screen filtering screening method and a gravity filtering method or a combination thereof.

Further, the stirring described in step C is one of unidirectional stirring, multidirectional stirring, stranded stirring, or a combination thereof.

Further, the prepared adhesive is one of natural adhesive, synthetic adhesive, or a combination thereof.

Further, the colored adhesive is one of natural adhesive, synthetic adhesive, or a combination thereof.

The invention does not require paper pulp to react in water, saves a lot of water resources, not only has high working efficiency, but also saves energy and protects the environment.

BRIEF DESCRIPTION

Figure 1 is a flowchart of a preferred embodiment of the present invention;

2 is a flowchart of step C of the preferred embodiment of the present invention;

3 is a flowchart of step D of the preferred embodiment of the present invention;

4 is a flowchart of step E of the preferred embodiment of the present invention;

FIG. 5 is a flowchart of step G of the preferred embodiment of the present invention.

detailed description

The present invention will be further described below with reference to examples.

As shown in Fig. 1, a papermaking method includes the following steps:

A. Crush the fiber raw material into particles with an average diameter of less than 1000 μm and filaments with a diameter of 1 to 1000 μm.

The above diameter is not greater than the gap between two parallel rollers placed in the tablet press. It can be adjusted according to different paper types. The thickness of the finished paper affects the maximum diameter of particles and filaments that can be accepted during the crushing process of the fiber raw material.

In this embodiment, the fiber raw material is composed of long fibers and short fibers, the length of the long fibers is 2 to 5 mm, and the length of the short fibers is 0.5 to 2 mm. The pulping method in step A includes: mechanical energy pulping, chemical and thermal energy pulping, and mechanochemical comprehensive treatment pulping. In this embodiment, mechanical energy is used for pulping, and the fiber raw material is processed by a grinder. The processed fiber raw material has better hydrophilicity.

The fiber raw material described in step A is one or a combination of stem fibers, bast fibers, seed wool fibers, and wood fibers.

B. Physically screen the crushed fiber raw materials to remove impurities and debris; debris is the unqualified part. Impurities are unqualified parts, such as sand, gravel, etc. The screening method used is a screen filtration screening method or/and gravity filtration method.

C. Adjust the proportion of raw materials used to make paper and stir to form a gelatinous dough.

The composition ratio of the raw materials used to adjust the paper in step C includes modulation: the mass content of cellulose is 40%-95%, the mass content of hemicellulose is 2.5%-20%, and the mass content of lignin is 0- 30%, the mass content of the filler is 0-35%, the mass content of the prepared binder is 0-10%, and the average fiber length is 0.5-5 mm. The viscosity of the gelatinous dough described in Step C is 50 to 1000 Pa·s.

In the preparation process, starch and protein are preferably used as preparation binders to reduce the use of chemical reagents, and the paper produced will not affect the health of users, and is safe and environmentally friendly.

Modulation of average fiber length: Compare the average fiber length of the fiber raw material with the set average fiber length after step B, and then add relatively long fibers or relatively short fibers to the fiber raw material to achieve the set average fiber length.

In the process of modulation, according to the actual output demand and the actual fiber content of raw materials, the purpose of adjusting the cellulose ratio of the mixture is achieved by adding cellulose, filler, hemicellulose, and lignin. The content of short fibers is also adjusted according to actual needs. A high proportion of long fibers will increase the toughness of the entire paper.

Examples of fibers that can be used as additives are: polyester fiber, viscose fiber, acrylic fiber, cotton fiber, etc.

The stirring described in step C is one or a combination of unidirectional stirring, multidirectional stirring, and twisted stirring. The invention adopts the method of forward and reverse reciprocating stirring and then twisting and stirring of the high-speed mixer, so that the fibers and the adhesive are evenly distributed and interwoven, without the need to react in water, saving a lot of water resources, not only the work efficiency is high, but also Energy saving and environmental protection.

In one embodiment, as shown in FIG. 2, step C includes:

C1. Adjust the proportion of fiber raw materials used to make paper.

C2. The prepared binder is made of materials including starch and protein. The mass ratio of the long fiber, short fiber and prepared binder is 2:5:1; the length of the long fiber is 2-5 mm, and the length of the short fiber It is 0.5～2mm.

C3. The paper raw materials are fully stirred to form a gelatinous dough, and the viscosity of the gelatinous dough is 50-1000 Pa·s.

There are many options for the preparation of adhesives, such as base material adhesives, natural adhesives, synthetic adhesives, water-soluble adhesives, and solvent-based adhesives. In this embodiment, the prepared adhesive is a natural adhesive or/and a synthetic adhesive.

Base material adhesives: mainly include original (natural) starch, dextrin, casein, and now chemically synthesized and environmentally friendly various water-based latexes. Widely used in color boxes, cigarette packs, paper bags, gift boxes, hardcover boxes and various handmade boxes, as well as wooden furniture.

Natural binders: substances derived from nature. Including biological adhesives such as starch, protein, dextrin, animal glue, shellac, hide glue, rosin, etc.; also including mineral adhesives such as asphalt.

Synthetic adhesive: mainly refers to synthetic materials, including inorganic adhesives such as water glass, and organic adhesives such as synthetic resin and synthetic rubber.

Water-soluble adhesives: Adhesives using water as a solvent, mainly starch, dextrin, polyvinyl alcohol, carboxymethyl cellulose, etc.

Solvent-based adhesive: an adhesive that is insoluble in water and soluble in a certain solvent. Such as shellac, butyl rubber, etc.

Filling, the filling material can be selected from kaolin, calcium carbonate, talc, titanium dioxide, etc. Filling on the one hand can reduce costs, on the other hand is to improve the properties of paper products. The content of filler in paper raw materials is 0 to 35%.

In one embodiment, as shown in FIG. 3, step D includes:

D1. Set two sets of machine rollers placed in parallel;

D2. Squeeze the gelatinous dough out of the gap between two parallel rollers, the gap between the gap is 1μm ~ 5000μm;

D3. The gelatinous dough passes through the above-mentioned gap to form a wet paper sheet (cloth), and the humidity of the wet paper sheet is 50% to 70%.

E. Color the wet paper sheet and change its surface to the desired color.

E1. Prepare colored ink or colored adhesive;

The color ink or color adhesive is usually white. In one embodiment, as shown in FIG. 4, the nozzle coating method is used: the nozzle is filled with white ink or white adhesive; the nozzle sticks the white ink or white The mixture is sprayed onto the surface of the cloth (wet paper sheet), and the surface color of the cloth (wet paper sheet) becomes the desired white.

Other colors can also be selected according to the user's actual color requirements on the paper surface. It is also possible to use the primary colors of the raw materials and omit Step E.

The colored adhesive in this embodiment is a natural adhesive or/and a synthetic adhesive.

In this embodiment, the nozzle is filled with white ink or white adhesive. It is preferred to use white starch adhesive for spraying on the surface, which is healthier and lower cost. For some application scenarios that do not require white, this spraying process can be omitted.

The whiteness can be selected according to the purpose. The whiteness of books and periodicals paper is 55%-75%, the whiteness of newsprint is 45%-52%, the whiteness of offset color printing paper is 77%-87%, and the whiteness of color printing coated paper The maximum requirement is 80% to 85%.

F. Dehydrate the wet paper sheet to form a dry paper sheet; the dehydration method is one or a combination of baking dehydration, press dehydration, and air drying dehydration; it is formed by dehydrating the humidity of the wet paper sheet to 5% to 8% Dry paper sheet.

G. Cut dry paper and waste.

In one embodiment, as shown in FIG. 5, step G includes:

G1. Trim and cut the dry paper sheet according to the actual required size;

G2. Cut off the excess edges of the cut paper.

When working, first of all, through mechanical energy pulping, chemical and thermal energy pulping, mechanochemical comprehensive treatment and pulping methods, the fiber raw materials are crushed into particles with an average diameter of less than 1000 μm and filaments with a diameter of 1 to 1000 μm; After the physical selection of the fiber raw materials, to remove impurities and debris; according to the actual output demand and the actual fiber content of the raw materials, by adding cellulose, filler, hemicellulose, lignin to achieve the modulation of the fiber mixture The purpose of the element ratio is also to adjust the ratio of the content of long fibers and short fibers according to actual needs. A high ratio of long fibers will improve the toughness of the entire paper. After the preparation is completed, the fiber and the preparation adhesive are evenly distributed and interweaved by the forward and reverse reciprocating stirring of the high-speed mixer and then the twisting and stirring method, and then the gelatinous dough is formed.

Press the gelatinous dough through the gap between two parallel rollers to form a wet paper sheet; fill the nozzle with white ink or colored adhesive, and the nozzle sprays the white ink or colored adhesive onto the wet paper sheet ( The surface of the cloth), thereby changing the surface color of the wet paper sheet (cloth) to white or other colors, and then dehydrating the wet paper sheet to form a dry paper sheet, and finally cutting and scrapping the dry paper sheet cut.

The method of the invention is simple, and the surface of the produced colored paper is sprayed or printed with white adhesive or white ink, which becomes a generally accepted white color. The invention does not require paper pulp to react in water, saves a lot of water resources, not only has high working efficiency, but also saves energy and protects the environment.

Claims

A method of making paper, characterized in that it includes the following steps:

A. Crush the fiber raw materials into particles with an average diameter of less than 1000 μm and filaments with a diameter of 1 to 1000 μm;

B. Physically screen the crushed fiber raw materials to remove impurities and debris;

C. Adjust the proportion of raw materials used to make paper and mix evenly to form a gelatinous dough;

D. Squeeze the gelatinous dough through the gap between two parallel rollers to form a wet paper sheet;

F. Dehydrate the wet paper sheet to form a dry paper sheet;

G. Cut dry paper and waste.
The method of making paper according to claim 1, further comprising step E, coloring the wet paper sheet to change its surface to a desired color.
The papermaking method according to claim 1, characterized in that the proportion of the raw materials used to adjust the papermaking material in step C includes modulation: the mass content of cellulose is 40% to 95%, and the mass content of hemicellulose It is 2.5% to 20%, the mass content of lignin is 0 to 30%, the mass content of the filler is 0 to 35%, the mass content of the prepared binder is 0 to 10%, and the average fiber length is 0.5 to 5 mm.
The method of making paper according to claim 1, wherein the viscosity of the gelatinous dough in step C is 50-1000 Pa·s.
The method of making paper according to claim 1, wherein step D comprises:

D1. Set two sets of machine rollers placed in parallel;

D2. Squeeze out the gelatinous dough from the gap between two parallel rollers, the gap between the gap is 1μm ~ 5000μm;

D3. The gelatinous dough passes through the above-mentioned gap to form a wet paper sheet, and the humidity of the wet paper sheet is 50% to 70%.
The method of making paper according to claim 2, wherein step E comprises:

E1. Prepare colored ink or colored adhesive;

E2. Print or spray colored ink or colored adhesive onto the wet paper sheet to form the external color of the wet paper sheet.
The method of making paper according to claim 1, wherein the dehydration method in step F is one or a combination of baking dehydration, squeezing dehydration, and air drying dehydration; dehydrating the wet paper sheet to 5 % To 8% to form a dry paper sheet.
The method of making paper according to claim 1, wherein step G comprises:

G1. Trim and cut the dry paper sheet according to the actual required size;

G2. Cut off the excess edges of the cut paper.
The method of making paper according to claim 3, characterized in that the average fiber length is adjusted by comparing the average fiber length of the fiber raw material with the set average fiber length after step B, and then adding relatively long fibers to the fiber raw material or Relatively short fibers to achieve the set average fiber length.