JP2002115188A - Method for producing paper-producing pulp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing paper-producing pulp, by which the good pulp can be obtained in simple processes without applying a chemical treatment. SOLUTION: This method for producing the paper-producing pulp, characterized by comprising a process for cutting a raw material in a constant length to produce chips, a process for mixing the chipped raw material with a microorganism to ferment the raw material, a process for grinding the fermented chips together with water to produce the pulp, and a process for washing the obtained pulp with water. It is preferable to use a white decay fungus as the microorganism. The raw material is especially not limited, but, for example, kenaf which is not a wood may be used. It is preferable to use warm water as the water on the grinding treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing paper pulp, and more particularly, to wood paper pulp using softwood, hardwood, etc., and non-wood paper pulp using non-wood plant raw materials such as jute and kenaf. The present invention relates to a method for producing paper pulp that can be used for producing pulp.

[0002]

2. Description of the Related Art Wood is mainly used as a raw material for paper pulp, and wood paper pulp accounts for 90% of the world's paper pulp production. Although wood pulp is suitable for mass production and mass consumption, it has the following problems. One of the usual pulp manufacturing methods is to add a chemical solution containing caustic soda and sodium sulfide as a main component to the chips for digestion, so that sulfur dioxide gas generated from the manufacturing process pollutes the atmosphere, The problem is that the cooking effluent and the papermaking process effluent contaminate the water quality. The two are deforestation due to logging. Deforestation has had a significant impact on weather and ecosystems, including being said to be causing global warming.

In order to solve such a problem of wood paper pulp, non-wood has recently been receiving attention as a new pulp resource. In particular, kenaf pulp is being studied as a non-wood paper pulp because it is an annual plant that grows quickly and is suitable for paper pulp. For example, Japanese Patent No. 2960063 proposes a pulping method without chemical treatment. This method includes a step of chipping kenaf, a step of pulverizing the chipped kenaf, and a step of boiling the pulverized kenaf in water (pulp). After the water boil is finished, it is washed with water and completed.

[0004]

However, the above-mentioned method requires that the ground kenaf is boiled in water for pulping. For this reason, it takes a long time to boil water and requires equipment for boiling water. It takes time and effort to boil water to obtain a small amount of pulp, and large equipment is required to obtain a large amount of pulp, which increases the cost of pulp.

[0005] Therefore, the present invention provides a method for producing paper pulp in a simple process without passing through the process of boiling water. Another object of the present invention is to provide a method for producing paper pulp without performing chemical treatment using a chemical solution such as caustic soda and thus without polluting the environment. Another object of the present invention is to provide a method for producing paper pulp which can obtain high-quality paper pulp having extremely high whiteness without using a bleaching agent.

[0006]

The present invention has the following configuration to achieve the above object. As a result of various studies, the inventors have found that pulping is performed by grinding chips. Therefore, the method for producing paper pulp according to the present invention comprises a step of cutting the raw material into chips of a predetermined length to form chips, a step of pulping the raw material by chipping with water, and a step of pulping the raw material. Washing the crushed material with water. Although the chip raw material is not particularly limited, for example, kenaf, which is non-wood, can be used. It is preferable to use warm water instead of water at the time of grinding. When hot water is used, the chip becomes flared, which is effective for fibrillation and removal of lignin. The above kenaf,
The kenaf stem may be separated into a core and a skin, and the core may be cut into a fixed length to form chips, or the separated skin may be cut into a fixed length to form chips.

The method for producing paper pulp according to the present invention includes a step of cutting the raw material into fixed lengths to form chips.
A step of mixing and fermenting microorganisms with the chipped raw material, pulping by grinding the fermented chips with water, and washing the pulped ground with water. It is characterized by. It is preferable to use a white rot fungus for the microorganism. The raw material is not particularly limited. For example, kenaf, which is non-wood, can be used. And it is preferable to use warm water as water at the time of grinding. The kenaf is obtained by separating the stem into a core and a skin and cutting the core into a fixed length to form a chip, or separating the stem into a core and a skin and cutting the skin into a fixed length to form a chip. Is also good. According to the present invention, lignin and pectin that adhere to the fibers can be removed by grinding the chips instead of simply grinding them, and at the same time, the fibers can be fibrillated to make them fluffy.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a preferred embodiment of a method for producing paper pulp according to the present invention will be described in the case where kenaf is used as a raw material. FIG. 1 is a schematic process diagram of the present invention. First, in the first step, kenaf, which is a raw material, is cut (formed into chips). The second step is chip fermentation (digestion) by microorganisms. In the third step, the fermented chips are ground (pulp). The fourth step is washing with water.

Cutting of raw material (chip formation) (first step) First, the first step is performed in the same manner as in a known pulp manufacturing method.
Kenaf, a raw material, is made into chips. The cultivated kenaf is cut off, and the stem from which the leaves have been dropped is cut into a length of about 1 to 2 cm to obtain a chip. To make kenaf chips,
After peeling the bark from the stem to separate it into a core and a bark, the core and the bark may be separately cut into chips, or a chip may be cut as it is from the stem. Roots can also be used as a raw material. The roots may be washed with water and cut into a fixed length to obtain chips.

The kenaf used as a raw material is preferably used while it is blue after cutting, but it is also possible to use the kenaf that has been cut and left to dry as it is or withered and dried. When roots are used as a raw material, the chips may be washed, dried, and then cut into chips.

Fermentation by Microorganism (Pulping Action) (Second Step) Next, kenaf chips are fermented by a microorganism. The inventor has conducted various studies from the viewpoint that pulping can be achieved by a simple method without polluting the environment, and as a result of fermentation heat generated when microorganisms ferment, the heat of fermentation using conventional chemicals It has been found that it has the same effect as cooking.

[0012] In order to ferment with a microorganism, a primary culture solution of the microorganism is sprayed evenly on the raw material chip,
Stir well. As the microorganism, a bacterium that degrades lignin or cellulose, for example, a white rot fungus, can be used. The amount of microorganism used depends on the material, water content, size, etc. of the chip, but is 2 to 8% by weight based on the raw material chip.
It is preferable to set the degree.

In order to ferment the chips, it is preferable to use a fermentation tank and to seal the chips to some extent in order to promote the fermentation. If the fermenter is provided with a bottom at the bottom, in the case of a chip having a large amount of water, excess moisture naturally accumulates at the bottom of the fermenter through the bottom of the fermenter, and fermentation can be further promoted. The fermentation speed varies depending on the material, water content, amount, etc. of the chip raw material, but takes about ten to several hours to several days. For example, in the case of a chip of 50 kg of raw kenaf bast, it took about 24 hours for fermentation heat to appear.

In the fermentation by microorganisms, lignin is decomposed by the microorganisms and a part of cellulose is decomposed to have the same effect as the conventional digestion. The use of microorganisms has solved the problem of air pollution and water pollution caused by conventional chemicals, and has made it possible to produce chemical-free and bleach-free pulp. After confirming that the chips in the fermenter have been fermented sufficiently, the process proceeds to the next step.

Grinding of Fermentation Chips (Pulping) (Third Step) Next, the fermented chips are pulverized by grinding with water. Conventionally, in order to pulverize the chips, it has been necessary to pulverize the chips by a pulverizing means and to boil or digest the pulverized products while chemically treating the pulverized products with an aqueous alkali solution. Such a conventional means was indispensable for removing lignin and pectin that adhered the fibers. The “method of producing kenaf pulp” in the above-mentioned Japanese Patent No. 2960063 also requires a step of boiling the pulverized kenaf in water, following the step of pulverizing the chips while stirring the chips.

In contrast to the above conventional method, the present invention provides:
Since the cooking or cooking action is performed by microorganisms, high-quality pulp can be obtained by milling with a mill. Grinding is carried out while pouring water with chips into the grinding device. The water may be room temperature water, but it is preferable to use warm water. The warm water uses warm water of 40 ° C. or more, preferably 50 ° C. or more. The use of warm water promotes the milling action.

The grinding device is a mill-type grinding device, but it is preferable that the upper grinding wheel and the lower grinding wheel do not adhere to each other and have a certain clearance. For example,
The outer periphery is a flat grinding surface and the inside is a concave frustoconical part, and a ring-shaped grindstone with a certain number and depth of grooves is opposed to each other up and down, a fixed grindstone above and a rotating grindstone below. A milling device can be provided. A clearance of about 0.01 to 0.1 mm is provided between the fixed whetstone and the rotary whetstone. As such a grinding device,
For example, "Mascoroider" (trade name, manufactured by Masuyuki Sangyo)
Can be used.

In the above-mentioned grinding apparatus, if chips serving as raw materials are introduced from the introduction port at the center of the grinding wheel, the introduced chips are placed on the grinding flat surface by centrifugal force caused by the high-speed rotation of the rotating grinding wheel from the inner periphery. It is supplied and discharged from the outer peripheral portion under the force of shearing force, rolling friction, compression attrition and the like. Chips can be pulped by such a grinding action.

Conventionally, in the case of pulp made of cellulose fiber, since the length and thickness of the fiber are too large or too hard as it is, fibrillation has been performed in which the fiber is separated by flapping and fluffed. In the present invention, fibrillation of fibers is achieved by means of grinding. Furthermore, in grinding, lignin etc. are removed from chips to some extent by digestion by microorganisms,
A substance such as lignin is further removed from the chip while performing fibrillation.

[0020] Papermaking pulp, especially kenaf pulp, was hard to obtain high-quality pulp only by milling because of its hard fibers. Thus, by combining digestion with the fermentation heat of microorganisms and milling, high-quality pulp without chemicals and without bleaching was obtained.

Washing with water (fourth step) Next, the pulp produced by grinding is washed with water. Washing with water may be carried out by putting it in a zigzag or fine wire mesh container and rinsing with water, or by putting it in a cloth bag and washing with water. The pulping is completed by washing with water. In order to store the pulp, the pulp washed with water may be sufficiently squeezed and stored as a squeezed mass, or the pulp may be stored after the mass has been broken and dried. The papermaking method using the pulp is not particularly limited, and can be performed by a conventionally known method.

In the above embodiment, kenaf pulping was described as a preferred embodiment, but it is a matter of course that the present invention is not limited to kenaf pulping. As long as it is papermaking pulp, its raw material is not particularly limited, and it does not matter whether it is wood pulp or non-wood pulp. Also,
In the above embodiment, the case where a fermentation step by a microorganism is provided as a preferable pulp production method,
The fermentation step can be omitted as appropriate. When the fermentation step is omitted, the chips are soaked in water in advance, or the temperature of the hot water used at the time of grinding is increased. For example, 70
It is preferable to grind the chips together with hot water at a temperature of at least ° C.

[0023]

According to the present invention, high-quality paper pulp can be produced in a large amount without chemicals and without bleaching. Further, since the steps such as cooking and cooking are not required, equipment is not required, and high quality paper pulp can be provided at low cost. Further, since no chemical treatment using a chemical solution or the like is performed, no pollution problem due to waste liquid treatment occurs.

[Brief description of the drawings]

FIG. 1 is a process chart showing a method for producing paper pulp of the present invention.

[Explanation of symbols]

 1: Cutting of raw material (chip formation) 2: Fermentation by microorganism (cooking action) 3: Grinding of fermentation chips (pulp formation) 4: Washing with water

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D21H 11/12 D21H 11/12 // (C12S 3/08 (C12S 3/08 C12R 1: 645) C12R 1 : 645)

Claims (9)

[Claims] 1. A step of cutting a raw material into chips by cutting to a predetermined length, a step of pulping by grinding the raw material chipped with water, and a step of washing the pulverized ground material with water. And a process for producing paper pulp. 2. The method for producing paper pulp according to claim 1, wherein the raw material is kenaf and the water at the time of milling is hot water. 3. The method for producing paper pulp according to claim 2, wherein the kenaf stem is separated into a core and a skin, and the core is cut into a predetermined length to form chips. 4. The method for producing paper pulp according to claim 2, wherein the kenaf stalk is separated into a core and a skin, and the skin is cut into a predetermined length to form chips. 5. A step of cutting a raw material into chips to form chips, a step of mixing microorganisms with the chipped raw materials and fermenting the mixture, and a step of grinding the fermented chips together with water to produce pulp. And a step of washing the pulped ground material with water. 6. The method for producing paper pulp according to claim 5, wherein the microorganism is a white rot fungus. 7. The method for producing paper pulp according to claim 5, wherein the raw material is kenaf and the water at the time of grinding is hot water. 8. The method for producing paper pulp according to claim 7, wherein the kenaf stalk is separated into a core and a skin, and the core is cut into a predetermined length to form chips. 9. The method for producing paper pulp according to claim 7, wherein the kenaf stalk is separated into a core and a skin, and the skin is cut into a predetermined length to form chips.