HUT63978A - Chipboard of arranged structure - Google Patents

Abstract

The invention relates to a chipboard with oriented structure comprising fibres (1) of vegetable origin e.g. wooden chippings having been fixed with some binding material (5) in their oriented position. The characteristic feature of the invention lies in that the fibres (1) of vegetable origin comprise ferromagnetic particles (2).

Description

The present invention relates to an ordered structure. a particle board which, in its directed position, is fixed with a binder, plant fibers, e.g. contains wood shavings.

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Different types of particle boards are known. Such as single or multilayer conventional chipboard, phenol formaldehyde resin-bonded wide flat chipboard (fiake board) or single or multilayer large (20-40mm long) chipboard (waferboard). It is also known to comply with sawdust or particle board with veneer on both sides. The rising cost of raw materials and the inadequate mechanical properties of conventional particleboard have led to the discovery of wood particleboard unconventional.

Such a new type of particle board is a structured particle board, the so-called chipboard. OSB-sheet (oriented structural board). OSB is a single or multilayer product made of large wood chips 30-50 mm long and 10-15 mm wide (Holzrundschau 12/12/1981 p.386-388). The mechanical properties of OSR boards are the same or better than those of veneer-covered sandwich panels (Forest Products Journal 33k.2, pp. 43-49).

An apparatus for producing a structured chipboard is disclosed in U.S. Patent No. 3,164,511. The familiar equipment mechanically controls large chips. The mechanical control was with cellular cylinders. Later, the. chip control with disc rollers. 1? The disadvantage of mechanical controls is that they are quite slender and therefore less suitable for large-scale production.

Mechanical control was further developed by Rison Works (USA), which used guiding discs with chain links for sorting. In order to increase productivity, they will later switch to electrostatic ordering of chips (Forest Industries I12-4, pp. 26-27). For electrostatic sorting, the required size of the chips is 75-100 mm long, 10-15 mm wide and 0.3-0.5 mm thick (Holz-Zentralblatt 105.k.84, p. 1236). Electrostatic3 ···· ···· sanitary equipment is disclosed in U.S. Patent 5,045,528. For electrostatic sorting, the chips must fall freely in the vertical direction. This free fall occurs between the cartridge inserts forming the electrodes.

The disadvantage of this method is that the chip material has to be approximately homogeneous because, due to their different sizes, the chip particles also have different mass inertia. The different humidity of the shavings affects the efficiency of the equipment, so it is also unfavorable that the humidity of the shavings should be set between 10-15%. It is also disadvantageous that the chipboard is pressed, thus deforming the plant fibers and losing their original properties.

The disadvantage of all known wood products is that the starting material is roundwood, and 60% of the live wood is therefore waste. The scarcity of coniferous wood is now perceptible worldwide, mainly in the form of rising prices. There is a need to produce a particle board which can utilize the branches of the foliage and the thicker root system, and with the help of which. waste can be significantly reduced.

The object of the present invention is to eliminate the drawbacks of the prior art and to provide a particle board which can be utilized in wood, has excellent mechanical properties and is quick and inexpensive to manufacture.

The inventive idea is based on the discovery that, when treated with individual plant fiber bundles or fibers with ferromagnetic material, the fibers are self-aligned in a magnetic field, compressed into one another, and in this position can be bonded with a binder to a more favorable particle board. It is also within the scope of the present invention that the ferromagnetic material is mixed with water to form a. plant fiber.

According to an object, the ordered chipboard according to the invention, which in its directed position is fixed with a binder, e.g. containing wood shavings, formed in such a way that:. plant fibers contain ferromagnetic particles.

A further feature of the invention may be the presence of a precipitate of ferromagnetic particles on the surface and channels of the plant fibers.

The chipboard according to the invention has several advantages. By distorting the magnetic field, plant fibers can be arranged not only in a straight line but also in a curved shape. By increasing the field strength, the fibers can be compressed side by side to avoid compression. By avoiding compression, not only is the technology process shorter and more economical, but the fibers retain their original elastic mechanical properties. The mechanical properties of the chipboard of the present invention are more favorable than any prior art solution.

It is also advantageous that the chipboard can be manufactured horizontally and the number of layers can be continuously increased. The present invention does not require the use of large wood chips. Production is much faster than before. It is also advantageous that the necessary plant fibers and fiber bundles can be extracted from the branches and root system, therefore; instead of the previous 40%, 90% of the living tree will be suitable for processing.

The invention hereinafter referred to as an embodiment connection. drawing based ismertetjiik closely.

The attached drawings show

Figure 1 is a plant fiber; side view of the

Figure 2 is a cross-sectional view of the plant fiber with the ···· ·············································································· ·

Figure 3 is a schematic diagram of the manufacture of chipboard in magnetic field.

Figure 1 shows plant fiber 1 with ferromagnetic particles 2 dispersed on its surface, e.g. Iron oxide. By fiber is meant a set of elongated cell bundles. Figure 2 shows a cross-section of the plant fiber 1. It can be seen that the ferromagnetic particles 2 adhere not only to the surface of the plant fiber 1 as a precipitate but also embedded in the channels of the plant fiber 1.

The sketch of Figure 3 illustrates the chipboard and its manufacturing process in more detail. In the magnetic field 3 represented by the north (N) - south (D) poles, the plant fibers 1, such as elementary dipoles, align in one direction. By increasing the intensity of the magnetic field 3, the plant fibers 1 can be compacted side by side. The plant fibers 1 are arranged on a conveyor belt 4 which runs uniformly in the horizontal direction. Unidirectional plant fibers 1 are sprayed with binder 5. The binder 5 is a. varies depending on the area of use of the particle board, for example, synthetic resin or natural wood; cellulose intermediate adhesive. In addition to the continuous passage of the conveyor belt 4, additional plant fibers l can be applied to the binder 5, thereby increasing the number of layers of chipboard.

You can even manufacture rail sleepers to increase the number of plywood panels. By changing the direction of the magnetic field 3 or by distorting the force lines, the plant fibers 1 can be arranged and fixed in different positions.

The particle board according to the invention can be used mainly in the construction industry, furniture industry and wood-utilizing areas of the industry.

Claims (2)

An ordered particle board which, in its directed position, is fixed with a binder, e.g. containing wood chips, characterized in that the plant fibers (1) include ferromagnetic particles (2). Chipboard according to Claim 1, characterized in that a deposit of ferromagnetic particles (2) is located on the surface of the plant fibers (1) and in its channels.