FI117129B - Method and apparatus for scattering chips - Google Patents

Description

METHOD AND APPARATUS FOR CHIPPING

The present invention relates to a method for scattering chips in a process by scattering the chips on one or more roller rollers or the like and in which the scavenging gas, which is generally air, is used. Further, the apparatus of the invention f for carrying out the method.

In the manufacture of particle board, a mixture consisting of chips and a binder mixed with them is used to form the particle board; a mat for a belt conveyor or the like. The chip mat is pressed into a plate-like piece in a press, usually a hot press, which is image-operative, or else the chip mat can be cut and transported to a stroke press with cross plates.

15 In the manufacture of particle board, the aim is to optimize the scattering of the mah, so that the mixture of chips and binder becomes a uniform mat on the belt or the like. The scattering f occurs so that the coarser material is located on both surfaces of the finer material of the sheet being manufactured. Because the board generally has a target thickness of ί 20 after the compression step, the particle size distribution * to the abrasive depth should be as low as possible * * v .: after grinding, the surface will be <ψ · * v: consistent with the abrasive depth. Thus, the fine area should be as high as possible to achieve a patchy and even surface despite the thickness variations of the mat.

·· * ·· «4 m m * ♦ ··· *. Fl patent 90746 discloses an apparatus for scattering fibers or chips together with a binder for a scattering belt conveyor, wherein βίβ is a single track consisting of at least three mutually one; 30 rollers and adjustable track spacing. Track and strap among others. .. .. ....

2

Fl patent 97112 discloses an apparatus for scattering fibers and chips in an apparatus above the actual scattering roll, with a preload of chips preformed at the beginning of the chuck <This preload includes at least two adjacent rolls 5 formed between cylinders. The spacing between the individual rollers in the pre-roll is greater than the spacing between the rolls in the actual track for the pre-roll; The preload enhances the separation of fine particles in the Hiei layer at the beginning of the actual track, as the coarser material fits between the track slits of the track, moving to the actual roll: after the 10 track.

In the manufacture of plates, in particular for coating applications, the hic sanded surface must be as homogeneous and homogeneous as possible, so that the coating thickness is as thin as possible ki | 15 to minimize. The problem with known scattering methods is to increase the uniformity of the j region.

If the airflow is only used between the belt conveyor and the upper half of the roller as usual, the airflow tends to bring the fine ai to the far end of the roller. This causes the fine cargo to be right on the surface of the abrasive area, resulting in a surface exposed after grinding of mm. too coarse and porous the finest material was ground: T; After grinding, the surface properties also vary too much due to: j *: variations in sanding depth. Another problem is that small sharks: ***. Thus, in the aforesaid process, the most abrasive is to be adsorb * the most relatively expensive binder which needs to be added more than the net need in order to obtain larger particles to provide sufficient strength. Highly binder-containing dust also causes clogging and / or excessive wear of abrasive papers.

It is also an object of the present invention to provide an apparatus for scattering a surface layer using the inventive composition. In the method according to the invention, the gas stream (which is <air) is conducted in different directions or velocities and velocities of the gas streams of the track and belt conveyor 5, it is possible to control the desired intermediate with at least one track intermediate to the other track. The velocity of the gas streams in the various track spacing can be advantageously influenced by the fractional distribution, thereby ultimately affecting the surface quality of the sheet. In addition, it is possible to obtain 10 equilibrium shifts to the desired location by adjusting the gas flow rate j, thereby improving the quality control of the scattering process. For example, above the lowest roller, the gas flow is opposite to the gas flow between roller and belt conveyor. For this finest chip, during pre-fractionation, it moves more centrally to the lowest roller 15 on the chipboard more uniformly than in known equipment.

Detailed features of the invention are set forth in the claims.

The method and apparatus of the invention provide an improved scattering result. V: thinner and avoids the finest and most abundant: T; accumulation of adsorbed material near chipboard surface layer: fine layer can be distributed evenly from surface to surface ·· *. Up to 25 depths. In addition, binder-rich adsorbent dust js *!:. significantly more in the non-abrasive structure, whereby the concentration of the lastur can be reduced and the desired nose is still achieved. better sanding, whereby the amount of abrasive paper required * · »• ;; j 30 The quality of the sanded surface of the particle board is also smoother The variations in the surface quality of the various sanding depths are considerably smaller. Star 4

The invention will now be described in more detail with reference to the following silicon

Figure 1 is a side view of a preferred embodiment of the spreading apparatus of the invention comprising at least two rollers 2 and 11.

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As shown in Figure 2, the chamber-like spaces are separated by a baffle plate 14 or the like mounted on the end of the rollers.

Figure 3 shows an embodiment with only one track.

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Figure 4 shows a simplified schematic example of a scattering result according to the invention.

Figure 5 shows an example of the result of the present invention.

| Figure 1 is a side view of a preferred embodiment of the spreading apparatus of the invention comprising at least two rollers 2 and 11.

20 The dosing conveyor 5 feeds the chipless 3 under the control of roller 1. The roller roller consists of parallel rotating rolls. Since the telojer: V: slits, the chip material falls between the slots 2 and 11 of the roll: * · *: for the belt conveyor 8. The finer material falls from the upper roller 2

. viewed from the beginning of the set of 11 and the coarser the more o) Y

25 is provided by increasing the roll spacing and / or by increasing the pin profile depth of the rolls. Finally, a belt 9 is formed on the belt conveyor 8 which I carries forward. In addition to the scattering machine of Figure 1, a ***** mirror-scattering machine is required to provide a complete symmetrical with fine top and bottom surface layers and a coarser core 30 formed for further transfer to the press. Often the above mentioned machineider ··· ♦ ·. . | »| | i „t # i u, t * i ·.

5! through. The gas flow 10 carries the material falling through the roller 11, the fine chips being transported, on average, slightly farther than I suppose as the fine and coarse material mixes with the belt conveyor 8 from the two materials so that the material is as homogeneous as possible.

The gas shall be blown or aspirated over the racks or between the rack and the straps and the gas removed by means of a gas suction 4. Ka; further regulated by a movable flap 6 or the like, with a v <10, if necessary, for additional gas 7 to flow between the rollers or between the rollers and the belt.

The gas flow between the tracks is further regulated by a gas blowing suction 4 which is introduced by the tracks 2,11 or the track 11 and the conveyor 15 The speeds and intensities and direction of the gas flows are each adjustable in each chamber-like state 12,13 by gas blowing. It is shown in Fig. 1 that one direction of the gas streams s 1 can also be opposite, i.e. the direction of the gas gas blowing 10 and 7 can be as desired.

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By way of example, when there are two roller tracks 2.11, there is a substantially chamber-like space between the lower tel: Y: conveyor belt 8: T: opposite to the gas flow direction 25 i i of the upper roller 2 and the lower roller 1:

The chamber-like spaces may also be separated from one another by a spacer or similar spacer "** 'mounted at the end of the tracks, whereby in each substantially chamber-like space 12,13, the gas may be in communication with the other chamber-like spaces.

6 1

Figure 4 shows a simplified schematic example! and the scattering texture of the present invention in Figure 5. In Figures 4 and 5, 1 is the axis including the thickness of the sheet from the non-abrasive surface A. 5% by weight of material fractions. The finest fraction is denoted by j4. The charts show how much each fraction is added at a certain depth. The surface level after grinding is represented by the C-k sanded area with the letter "D". The variation in the thickness of the non-abrasive sheet The abraded surface C can be positioned anywhere along the letter B, as shown in Fig. 4.

In the structure of the invention shown in Figure 5, area B is Hoi * and the proportions of fractions visible on surface C remain constant regardless of that location.

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It will be apparent to one skilled in the art that the various embodiments of the invention are limited solely to the above examples and may vary within the scope of the following claims.

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Claims (5)

7 1 1. A method for scattering chips, comprising: scattering through one (11) or more (11.2) rollers! 5 (9) for a movable belt conveyor (8) or the like and which is assisted by a gas flow, e.g. an air known gas stream is introduced into at least two substantially chambers (13,12) located below at least one chassis and at least one chamber-like gas stream (4) the direction is in the opposite direction to other corners (13). Method according to claim 1, known by gas blowing and / or suction controlling the gas flow and direction. The method of claims 1-2, the known direction and velocity of the gas flow being individually adjustable: in a substantially chamber-like state (12,13), the gas flow 20 being 0.1-3 m / s. : A: 4. Apparatus for scattering chips (3) into a chipping mat: T: with binder for belt conveyor (8), comprising: scattering through one (11) or more (11,2) rollers] / **. Auxiliary gas streams, e.g. air, characterized in that I is supplied to at least two substantially chamber-like spaces located at the top and bottom ** of at least one of the tracks (11) in at least one chamber-like space (12). in the opposite direction to the other ventricular spaces »* # 30 Apparatus according to claims 4-5, wherein the substantially chamber-like spaces (12,13) are separated by a baffle plate or equivalent elements (14) mounted on the ends of the rollers, wherein the gas streams (4,10) in each substantially chamber 5 can be separate, Yesterday you need to be in touch. • «• ·« • i »« «9 9« 9 9 9 «99 9 • 9 9 9 9 * · 99 · 9 9« «9 9 9 999 • • 99 9 9 9 99 9 9 1 9 9 9 9 9 9 9 * • «· 9« 99 9 99 9 9 9