JPH02264096A - Production of sheet from wood flour and bark - Google Patents

Abstract

PURPOSE:To obtain a pollution-free sheet useful as a building material, construction material, agricultural material, stockbreeding material, etc., at a low cost while effectively utilizing sawdust, etc., discarded hitherto as industrial wastes by compounding wood flour, etc., with natural fiber, etc., and forming the mixture into a sheet with a wet paper-making machine. CONSTITUTION:The objective sheet can be produced by compounding wood flour and/or bark with at least one component selected from natural fiber, synthetic fiber, chemical fiber and synthetic pulp and forming the mixture into a sheet with a wet paper-making machine. Preferably, the mesh size of the paper-making machine for the screening of the raw material is 30-120 mesh and the raw material is beaten to a freeness (Canadian freeness) of 100-700cc and compounded with >=5% of natural or synthetic fiber.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention applies to wood powder commonly known as sawdust and bark (park), which is treated as industrial waste generated at sawmills, pulp factories, etc.
The purpose of this project is to establish a technology for producing sheets using a wet paper machine.

Sheeted products can be used as construction materials, civil engineering materials, agricultural materials, livestock materials, etc. by being given various functions.
It can be used effectively and inexpensively as miscellaneous goods and decorative materials.

[Conventional technology 1] The composition of sawdust and bark is considered to be tree fragments, which cannot be suspended in water but float, and also have fiber entanglements (which cannot be expected at all, but which form a sheet and have a certain strength). It was difficult to do so.

[Problem to be solved by the invention]

Sawdust and bark will float to the surface when placed in water.)
Moreover, since it does not have adhesion properties, it is extremely difficult to make uniform sheets using the wet papermaking method.

[Means to solve the problem]

In order to solve this problem, the present invention succeeded in forming a sheet of wood flour (commonly known as sawdust) and/or bark (park) by suitably blending natural or synthetic fibers that can be suspended in water. However, when making continuous sheets, it is important to know how to prevent clogging on the wire, how to have the wet paper picked up by the conveying blanket, and how to prevent paper breakage during paper making to prevent sawdust and bark from falling off. The most difficult point was how to continuously produce uniform sheets.

In order to uniformly disperse and suspend the sawdust or bark in water, for example, when a conventional pulp raw material is used, the sawdust or bark is gradually added to the pulp suspension while stirring. It is desirable that the circulation of stirring be performed in an upward and downward direction.

If the pulp content is less than 5%, the paper will not have strength and will break when separated from the wire.

Next, the sawdust or bark is passed through a crusher to make the size uniform. The beating machine is a beater even if it is a refiner type.
It can also be a model. As a guideline for uniformity during beating, the objective can be achieved by measuring the freeness, but it is possible to achieve the goal by measuring the freeness.
If it is less than 0 cc, the wire will become clogged, dewatering will be poor, and wire separation will be poor, and transfer to the blanket will be uneven, making it impossible to make paper. Moreover, if the volume is more than 700 cc, the pulp will not be mixed uniformly, the paper strength will not be good, and furthermore, papermaking will become impossible.

Wire mesh and freeness have a mutually complementary relationship, and striking a balance between them is the most important point in continuing continuous production.

In carrying out the present invention, the mesh size of the raw material is 30 to 30.
120 mesh is optimal.

Various chemicals are added to the above raw materials, and the finished sheet is processed by impregnation, coating, spraying, etc. to give it functionality.The chemicals used in the above are those used in the paper manufacturing industry. All chemicals can be used.

〔Example〕

In order to further explain the present invention in detail, the present invention will be explained using the following specific examples, but the present invention is not limited only to the following examples.

Example 1 50% saw flour and 50% NBKP (bleached softwood kraft pulp) were mixed and adjusted to a freeness of 300 cc using a beating machine, and Kaimen 557H (manufactured by Detzik Hercules) was added as a wet strength agent. 1% of the raw material was added, and a sheet of 100m2 was made using a circular wire paper machine with 60 mesh wire.

This sheet was sprayed with a commercially available deodorizer at 20 g/nf and used as a bed sheet. Not only did the sheet absorb pet urine and have a deodorizing effect, but the sheet, which was disposed of in the soil after use, completely disappeared within six months and was also effective as compost.

Example 2 90% cypress bark and 10% LBKP (bleached hardwood kraft pulp) were mixed and the mixture was made to a freeness of 5 using a beating machine.
The protoplasm adjusted to GQcc and further stained according to a conventional method,
A circular paper machine with 100 mesh wire makes 6 m2
I made a sheet of 0. This sheet has a decorative effect that makes use of natural bark, has a faint scent of wood, and is a natural paper with a fancy tone.

Table 1 shows the physical properties of each sheet in the above.

Table 1 [Effects of the invention] The present invention produces a low-cost, disposable, natural scent from sawdust and bark, which are industrial wastes that have been simply discarded and incinerated, with little use of the raw materials themselves. This is a non-polluting sheet that can be effectively used to float in the air, and completely disappears even if it is discarded after use.

Claims (4)

[Claims] (1) Wood flour and/or bark and natural fibers, synthetic fibers,
A method for manufacturing a sheet, comprising blending at least one of chemical fibers and synthetic pulp and forming the sheet using a wet paper machine. (2) The mesh of the paper machine that takes the raw material is 30 to 120 mesh, and the freeness (Canadian freeness) of the raw material is 1.
Beaten to 00-700cc, 5% natural or synthetic fiber
The method for manufacturing a sheet according to claim 1, comprising the above blends. (3) The method for producing a sheet according to claim 1 or 2, wherein the sheet is filled with, impregnated with, sprayed on, coated with, etc., with a substance that imparts functionality depending on the intended use. (4) Claim 1, which is colored or embossed, and is further laminated with paper, film, etc. to provide functionality as well as a decorative effect;
2. The method for producing a sheet according to 2 or 3.