JPH02501394A - Mechanical pulp manufacturing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention uses coniferous trees for use in various papers, cardboards, etc.

Materials made from lignocellulose-containing materials such as hardwoods or bamboos. The present invention relates to a method for manufacturing mechanical, thermomechanical, and chemimechanical valves.

The refining process involves cutting the material into chips, which are usually disc-refined. It is passed through the finer once or twice, sometimes three times, to be refined into valves. manufactured by this method The valves are RMP (Ritziner Mechanical Valve) and TMP (Thermomechanical Valve). Kanib J Le Parve), GMP (Chemimechanical Valve) and CTMP (Chemisa -Momechanical valves).

RMP: Untreated chips are refined under atmospheric pressure.

TMP: Refining steam-treated chips under overpressure.

CMP: Chemically treated chips are refined under atmospheric pressure.

CTMP: Chemically treated chips are refined in steam under overpressure.

The bulb has a high long Ill content and excellent strength properties. However, energy Energy consumption is high, approximately 2000KWh/bulb t. long and stiff fibers 6. Forming and smoothing of paper in paper making machine to increase the content. The power and optical properties are sometimes inadequate.

In older milling methods, blocks, or logs cut to length, are processed without water. The wood is crushed by pressing it against a rotating whetstone. For valves using the sofaning method described above. The corresponding valve types are as follows.

Crushed Ice Pulp 2 Raw wood is crushed under atmospheric pressure.

As a variant of the latter method, the stock is impregnated with chemicals and then cooked in an autoclave. There is also a method of crushing wood (Usp-, 2,713,540).

Five In the case of ice-breaking valves, the content of S fibers is lower than in refining valves.

For this reason, the strength characteristics are inferior, but the forming, smoothness and optical characteristics of the refined valve are inferior. is better than. Energy disappears! II is quite low, approximately 1000kWh/ This is valve t. One significant drawback is that log material must be used It is.

The chemical ice crushing process produces valves with excellent strength properties. But long Since the center of the log is not impregnated, the center remains black even after cooking, and the The ISO brightness of the bulb is low, making it difficult to bleach the bulb. Therefore, this method It is not widely used.

The purpose of the present invention is to eliminate the use of log materials that consume high energy, have poor strength, and The aim is to provide a method that does not have the disadvantages of having to use it.

The above objects and other objects are achieved by the present invention as defined in the appended claims. achieved by the method.

The attached block diagram shows in principle one embodiment of the invention.

A piece of edgi material (edgiH) or other material with the minimum dimensions shown below.

In Step 2, spray the raw material with heavy water to clean the raw material and remove sand and other impurities. Ru. In Step 3, the raw material is split into pieces, for example with a crosscut saw, and the material is cut into pieces with a maximum of 50 #R1 Or up to 25g! Make a stick with the smallest dimension across the line direction. Therefore , the stick can be in the form of a lip whose width is similar to the transverse dimension of the raw material However, its thickness does not exceed the dimensions mentioned above. Cleaving is for each Seed-type cleaved HN, preferably the m-fiber to leave it as intact as possible It is carried out by a device that splits the wood along the structure. The purpose of cleavage is the subsequent impregnation process. This is to make the work easier. If the raw material consists of e.g. a thin backing or an edging material, Of course, the cleavage step can be omitted when the cleavage process is carried out.

Step 5: Heat the stick with atmospheric pressure or low-pressure steam to remove air that interferes with impregnation. . Step 6: Impregnate the stick with the liquid. This liquid may be water or water containing chemicals. Good too. The liquid is pumped into the textile material using a high hydraulic pump.

Chemicals include bases such as caustic soda, sodium sulfite, and sodium bisulfite. It can be an alkali metal salt, such as an alkali metal salt, or a decomposed compound, such as a peroxide. For example, caustic Mixtures of powder and sodium sulfite or peroxide may also be used. Impregnation is different The process may be carried out more than once using different chemicals, in which case the excess chemicals are removed between steps. Ru.

During liquid impregnation, residual air is removed from the wood and replaced with liquid. IIF expands This allows for easy thrashing during disintegration, resulting in a valve with excellent strength. liquid etc. The strength can be varied according to the composition. The mildest effect is obtained using only water; When alkali is used, the semi-cellulose of wood becomes more f! Expand. sulfite II salt or hypochlorite When sulfate is used, partial sulfonation occurs and lignin is eliminated. Alkaline The yellow coloration can interfere with the action of peroxides.

As more chemicals are liberated, bulb yields decrease, optical properties deteriorate, and chemical consumption increases. The amount is large and causes serious environmental problems.

Therefore, chemicals need to be measured carefully.

In step 7, the impregnated stick is reacted with a chemical at a constant temperature for a constant v1 period. reaction is carried out in the liquid or vapor phase at atmospheric pressure or overpressure. After the reaction is complete, remove the excess liquid. to be discharged. At step 8, the stick is oriented in a certain direction while supplying water. The material is defibrated by pressing it against the surface of the rotary disintegrator while the product is being held in place. Therefore, □, ゛7"L/"28blindt"This second 08, □, 6...

The direction of motion is perpendicular to the tian direction, for example aluminum oxide or carbide Contains a grinding wheel made of sharp, hard particles made of silicon held together by a ceramic bond. An ice crusher (preferably pressurized) may be used. The ice crusher and its feeder are Must be suitable for handling sticks instead of locks. Existing bracelet Places, chains, screws, etc. are not very suitable. Pressure plate turns wood into ice crushing surface Pocket-type devices that press are preferred.

At step 9, the bulb after disintegration is taken out and subjected to subsequent processing, such as screening, washing, 8j! Subjected to white and other treatments.

Of course, other embodiments can be devised within the spirit of the invention. Each process A variety of continuous and discontinuous devices may be used. Disassembling the cross cutting in 3 It may be carried out to obtain wood that is twice or several times longer than the final length suitable for installation. A final crosscut may be performed before disaggregation.

The steam heating step in step 5 may be omitted or replaced with e.g. vacuum evaporation, in step 7. The reaction can also be omitted. It is also possible to use other types of esoteric devices. Ru. For example, one solution can be performed on the flat surface of a disintegrating disk. Disintegration surface It may also be constructed of other materials such as steel and cemented carbides. stomach Mechanical valve: Steam heated as required, impregnated with water, and under atmospheric pressure! ! lji do.

Two thermomechanical valves are heated with steam as required, impregnated with chemicals, and steamed as required. Under the steam disintegrate.

Chemi-mechanical pulp is heated twice, impregnated with chemicals, digested if necessary, and released into the atmosphere. Disintegrates under pressure.

Chemi-thermomechanical valve: Steam treated, impregnated with chemicals, and if necessary cooked. , disintegrated under steam pressure Other modifications may also be envisaged within the spirit of the invention.

! Scope of request for correction 1. The fibers are oriented in the same plane as the tangential press surface and the surface is preferably in the fiber direction. The material is pressed against a rotating disintegrating member while moving perpendicularly to the disintegrating member. containing fragmented lignocellulose having a length in the fiber direction of at least 200a+ A method for producing mechanical pulp made of materials, in which the fiber structure of the material is first The thickness of the material piece can be increased up to 50 aw by splitting it along the fibers2, impregnating the material piece. 2. A method according to claim 1, characterized in that the method is steam-treated immediately before.

3. A claim characterized in that the impregnation is carried out in several steps using different impregnating liquids. The method according to scope 1 or 2.

4. Between impregnation and disintegration, the material pieces are cooked under superpressure in a vapor phase or an oil phase. The method according to any one of claims 1 to 3, characterized in that:

international search report or〒zcrQ7/nnaqa

Claims (5)

[Claims] 1. Pressing the material against a rotating disintegrating member while supplying liquid to disintegrate it fragmented lignocellulose-containing material having a length in the fiber direction of at least 200 mm. A method for producing mechanical pulp made of organic material, in which the thickness of a piece of material is Reduced to a minimum dimension transverse to the fiber direction of up to 50 mm and impregnated the piece of material with liquid. A method characterized by subsequently performing disaggregation. 2. reducing the thickness of a piece of material by cleaving it along the fibrous structure of the material The method according to claim 1, characterized in that: 3. According to claim 1 or 2, characterized in that the piece of material is steam-treated immediately before impregnation. Method described. 4. Claim characterized in that the impregnation is carried out in several steps with different impregnating liquids The method according to any one of ranges 1 to 3. ヰ 5. During impregnation and disintegration, the material pieces are cooked under superpressure in the vapor phase or in the liquid phase. 5. The method according to any one of claims 1 to 4, characterized in that: