CN116163160A - Paper towel without chemical fiber and production method thereof - Google Patents

Abstract

The invention is a paper towel without chemical fiber, which is composed of three parts: the surface layer, the bottom layer and the core layer, wherein: the surface layer and the bottom layer are made of 80% bleached coniferous wood and 20% bleached hardwood (or flash drying) pulp Blended, the core layer is made of 80% bleached hardwood (or flash-dried) pulp and 20% bleached softwood pulp. The invention is a kind of reasonable design and scientific process, which adopts softwood pulp, broad-leaved wood pulp, flash drying pulp, cotton pulp and fluff pulp in combination ratio, and is equipped with temporary reinforcing glue, papermaking wet strength agent, dispersant and neutralizing agent. A kind of paper towel product and its production method that make the surface of the crepe paper stronger in structure, high in bulk, good in absorbability and soft, by using a non-toxic sizing agent.

Description

A paper towel without chemical fiber and its production method

technical field

The invention relates to paper and paper processed products, in particular to a chemical fiber-free paper towel and a production method thereof.

Background technique

People cannot do without all kinds of paper towels, disposable towels and bath towels and all kinds of highly absorbent and soft wiping products. At present, there are a wide variety of disposable wiping products and non-woven products on the market. More or less are inseparable from chemical fiber. As we all know, chemical fiber is a petroleum product. Although its functions are very suitable for the current fast-paced life, the relatively stable molecular structure of chemical fiber makes it difficult to decompose and degrade. At present, many countries and Organizations are looking for alternative raw materials and products.

The requirement for the production of soft and highly absorbent paper towels with surface enhancement lies in the selection of basic raw materials and the combination of papermaking and processing to make them more bulky and soft, and to make them stronger by printing glue on the surface, so as to provide better disposable products for the disposable products industry. Many options and prospects.

Contents of the invention

The purpose of this invention is to use several kinds of plant fiber raw materials, add softener, papermaking wet strength agent and dispersant to wait for the plant fiber to be made into paper, and then apply surface reinforcing glue on the front and back of the wet paper respectively, and then dry it at high temperature in a large tank. Wrinkled. The product has high bulk, very good absorbency, water retention, good softness and skin-friendly, without any chemical fiber, temporarily has high dry strength and certain wet strength (temporary strength in blisters Naturally hydrolyzed after a period of time). The invention is a new product and production method of the disposable daily necessities industry and household paper.

The invention is a chemical fiber-free paper towel, which is composed of three parts: the surface layer, the bottom layer and the core layer, wherein: the surface layer and the bottom layer are made of 80% bleached coniferous wood and 20% bleached hardwood (or flash drying) pulp Blended, the core layer is made of 80% bleached hardwood (or flash-dried) pulp and 20% bleached softwood pulp.

The present invention also includes a method for producing paper towels without chemical fibers, including the selection of raw materials, pulping and beating, dilution and pulping, molding, compounding, gluing, pre-drying, and drying in a dryer to crepe paper, including the following steps :

(1) On the surface, the bottom layer is made of 80% bleached coniferous wood and 20% bleached hardwood (or flash drying) pulp with a concentration of 5-6%. After beating, the beating degree is 26±2°SR, wet The weight is 8-12g; adjust the pulp concentration to 2-3% in the stock tank, add 0-20kg of wet strength agent per ton of paper and mix for 30-40 minutes, then add AKD pulp according to the amount of 5-15kg per ton of paper, after After the pulping concentration reaches 0.1-0.2%, add 2 kg of diluted PEO per ton paper into the high-level box, and form it by a low-quantity cylinder former;

(2) The core layer is selected from 80% bleached hardwood (or flash drying) pulp and 20% bleached softwood pulp, the concentration of which is 5-6%. ~8g; After the pulping concentration reaches 0.1~0.2%, add 2 kg of diluted PEO per ton paper in the high-level box, and shape it through the cylinder former;

(3) After the surface layer, the core layer and the bottom layer are compounded by three layers (or multiple layers) of couch rolls, the moisture is squeezed out by pressing, and the surface of the wet paper sheet is coated with low-quantity grid glue by transfer after pressing. The surface is preliminarily cured by infrared (or high-temperature hot air); the other side is also coated with grid-like glue through the transfer of felt; the wet paper is pressed and pasted on a large drying cylinder by rollers and dried by scraping at the same time.

As a preference, the present invention also includes the following steps: lead out the paper sheet after one crumpling from the drying cylinder, and transfer coating on the other side by grid transfer, the adhesive surface is preliminarily cured by infrared (or high-temperature hot air), and then pressed by a supporting roller It is dried on a large drying cylinder and is wrinkled twice by a scraper.

Preferably, the present invention also includes the following steps: After the wet paper sheets are compounded and pressed, they are dried into a semi-finished product in a single or multiple cylinders for use; the semi-finished paper roll is unwound by an unwinding mechanism and coated once.

Preferably, the grid-shaped glue on the front and back surfaces has a temporary reinforcing coating, and the coating glue will naturally hydrolyze (lose strength) after being kept in water for a certain period of time.

Preferably, the grid shape of the temporary reinforcing coating can be a honeycomb grid, the grid line spacing is 1.5-2 mm, and the glue line width is 0.2-0.5 mm.

Preferably, the temporary reinforcing coating is a strong resin with temporary dry and wet properties such as modified polyacrylamide resin or modified acrylate or glyoxal polyamide resin.

Preferably, the composite method of the surface layer, the bottom layer and the core layer can be multi-cylinder composite molding, or multi-layer inclined mesh molding.

Preferably, the grid transfer coating mechanism is a gravure printing mechanism, and may also be a screen roller transfer printing mechanism, and must be coated on both sides.

The invention is a kind of reasonable design and scientific process, which adopts softwood pulp, broad-leaved wood pulp, flash drying pulp, cotton pulp and fluff pulp in a combination ratio, and is equipped with temporary reinforcing glue, papermaking wet strength agent, dispersant and neutralizing agent. A kind of paper towel product and its production method that make the surface of the crepe paper have a stronger structure, high bulk, good absorbency and softness by using a non-toxic sizing agent to form paper.

Detailed ways

The technical solutions of the present invention will be further specifically described below through examples.

Implementation Example 1

First, the surface and the bottom layer are made of 80% bleached coniferous wood and 20% bleached hardwood (or flash-dried) pulp, with a concentration of 5-6%. After beating, the beating degree is 26±2°SR, wet weight 8-12g; adjust the pulp concentration to 2-3% in the pulp tank, add 0-20kg wet strength agent per ton of paper and mix for 30-40 minutes, then add AKD pulp according to the amount of 5-15kg per ton of paper, after adjusting After the pulp concentration reaches 0.1-0.2%, 2 kg of diluted PEO per ton paper is added to the high-level box, and formed by a low-quantity cylinder former.

At the same time, the core layer is made of 80% bleached hardwood (or flash drying) pulp and 20% bleached softwood pulp, the concentration of which is 5-6%. 8g; after adjusting the pulp concentration to 0.1-0.2%, add 2 kg of diluted PEO per ton paper in the high-level box, and shape it through the cylinder former.

Finally, after the surface layer, the core layer and the bottom layer are compounded by three layers (or multiple layers) of couch rolls, the water is squeezed out by pressing. After pressing, the surface of the wet paper sheet is coated with low-quantity grid-like glue by transfer, and the glue surface is preliminarily cured by infrared (or high-temperature hot air). Transfer the other side through the felt and apply the same grid glue. The wet paper is pressed and pasted on a large drying cylinder by rollers for drying, and at the same time, it is creased by a scraper.

Implementation Example 2

First, the surface and the bottom layer are made of 80% bleached coniferous wood and 20% bleached hardwood (or flash-dried) pulp, with a concentration of 5-6%. After beating, the beating degree is 26±2°SR, wet weight 8-12g; adjust the pulp concentration to 2-3% in the pulp tank, add 0-20kg wet strength agent per ton of paper and mix for 30-40 minutes, then add AKD pulp according to the amount of 5-15kg per ton of paper, after adjusting After the pulp concentration reaches 0.1-0.2%, add 2 kg of diluted PEO per ton paper into the head box, and send it to the surface layer and the bottom layer of the former on the three-layer inclined wire former.

At the same time, the core layer is made of 80% bleached hardwood (or flash drying) pulp and 20% bleached softwood pulp, the concentration of which is 5-6%. 8g; after the pulping concentration reaches 0.1-0.2%, add 2 kg of diluted PEO per ton paper into the high-level box, and send it to the middle layer on the three-layer inclined wire former.

Finally, after the three layers of inclined wire are formed, the wet paper is pressed to squeeze out the moisture. After pressing, the surface of the wet paper sheet is coated with low-quantity grid-like glue by transfer, and the glue surface is preliminarily cured by infrared (or high-temperature hot air). The wet paper is pressed and pasted on a large drying cylinder by rollers for drying, and at the same time, it is creased by a scraper. The paper sheet after once wrinkling is drawn out from the drying cylinder, and the other side is also coated by grid transfer. Wrinkled twice.

Implementation example 3

With reference to implementation examples 1 and 2, after the wet paper sheets are compounded and pressed, they are dried into semi-finished products in a single or multiple cylinders and then used for later use. The semi-finished paper roll is unwound by the unwinding mechanism, and coated once, the surface of the paper sheet is coated with low-quantity grid glue by transfer, and the glue surface is preliminarily cured by infrared (or high-temperature hot air). The wet paper is pressed and pasted on a large drying cylinder by rollers for drying, and at the same time, it is wrinkled by a scraper at one time. The paper sheet after once wrinkling is drawn out from the drying cylinder, and the other side is also coated by grid transfer. Wrinkled twice.

The above-mentioned embodiment is an illustration of the present invention, not a limitation of the present invention, and any structure after simple transformation of the present invention belongs to the protection scope of the present invention.

Claims (9)

1. A tissue free of chemical fibers, characterized in that: is formed by compounding a surface layer, a bottom layer and a core layer, wherein: the surface and bottom layers are formed by mixing 80% bleached softwood and 20% bleached hardwood (or flash-dried) pulp, and the core layer is formed by mixing 80% bleached hardwood (or flash-dried) pulp and 20% bleached softwood pulp.

2. The production method of the paper towel without chemical fiber comprises the steps of raw material selection, pulp mixing and pulping, dilution and pulp mixing, forming, compounding, gluing, pre-drying and wrinkling to form paper, and is characterized by comprising the following steps of:

(1) The surface, the bottom layer adopts 80% bleached needle wood and 20% bleached broadleaf wood (or flash drying) pulp mixed pulp, the concentration is 5-6%, after pulping, the beating degree is 26+/-2 DEG SR, and the wet weight is 8-12 g; mixing pulp concentration in a pulp pond to 2-3%, adding 0-20kg of wet strength agent per ton of paper for mixing for 30-40 minutes, adding AKD (alkyl ketene dimer) according to 5-15 kg of the dosage of per ton of paper for pulp mixing, adding 2 kg of diluted PEO (PEO per ton of paper) into a high-level box for forming by a low-quantitative cylinder former after mixing pulp concentration to 0.1-0.2%;

(2) The core layer is made of 80% bleached hardwood (or flash drying) pulp and 20% bleached softwood pulp, the concentration of the bleached hardwood (or flash drying) pulp is 5-6%, after pulping, the beating degree is 18+/-2 DEG SR, and the wet weight is 4-8 g; adding diluted PEO ton paper with the dosage of 2 kg into a high-level box after the pulp concentration is regulated to 0.1-0.2%, and forming by a cylinder former;

(3) After the surface layer, the core layer and the bottom layer are compounded by three layers (or multiple layers) of couch rolls, water is pressed out by pressing, the surface of the wet paper after pressing is coated with low-quantitative latticed glue by transferring, and the glue surface is primarily solidified by infrared (or hot air) radiation; the other surface is transferred through the felt and is also coated with latticed glue; the wet paper sheet is pressed and stuck on a large drying cylinder through a carrier roller for drying and is wrinkled by a scraper.

3. The method for producing a tissue free of chemical fiber according to claim 2, further comprising the steps of: the paper sheet after primary wrinkling is led out of the drying cylinder, the other surface is coated by grid transfer, the rubber surface is primarily solidified by infrared (or high-temperature hot air) and then is stuck on a large drying cylinder by a backing roll to be dried, and meanwhile, the paper sheet is formed by secondary wrinkling of a scraper.

4. A method of producing a tissue free of chemical fibers according to claim 2 or 3, characterized by the further steps of: according to the method, after wet paper sheets are compositely molded and pressed, a semi-finished product is obtained by drying in a single large cylinder or multiple cylinders for standby; the semi-finished paper roll is unreeled by an unreeling mechanism and coated once.

5. A method of producing a tissue free of chemical fibers according to claim 2, characterized in that: the latticed gel on the front and back surfaces has a temporary reinforcing coating, which naturally hydrolyzes (loses strength) after being kept in water for a certain time.

6. The method for producing a tissue free of chemical fiber according to claim 5, wherein: the mesh shape of the temporary reinforcing coating may be a honeycomb mesh with the pitch of the mesh lines being 1.5-2mm and the width of the glue lines being 0.2-0.5mm.

7. A method of producing a tissue free of chemical fibers according to claim 5 or 6, characterized in that: the temporary reinforcing coating is a strong resin with temporary dry and wet properties, such as modified polyacrylamide resin, modified acrylic ester or glyoxal polyamide resin.

8. A method of producing a tissue free of chemical fibers according to claim 2, characterized in that: the composite mode of the surface layer, the bottom layer and the core layer can be multi-cylinder mould composite forming or multi-layer inclined net forming.

9. A method of producing a tissue free of chemical fibers according to claim 2, characterized in that: the grid transfer coating mechanism is a gravure printing mechanism, can also be a screen roller transfer mechanism, and must be subjected to double-sided coating.