FI117238B - of the adhesive - Google Patents

Description

117238

of the adhesive

The present invention relates to an adhesive mixer for affixing and abrasive particles of mechanical woodworking particles, such as chips, prior to scattering or other further processing, wherein the adhesive mixer has a chip opening at one end and an outlet at one end, and a bonding station where the glue mixer chamber being substantially cylindrical and elongated, having a central rotatable axle mounted over substantially the entire length of the chamber with tools for mixing and guiding the pulp mass in the glue mixer chamber.

As the capacity of chipboard mill production lines increases, the diameter of the glue mixers has also had to be substantially increased. In a typical machine 15, the inner diameter of the jacket has been changed, for example, from 500 mm to 900 mm. However, there has been no need to increase the diameter of the central shaft, and it has typically been kept e.g. at 200 - 300 mm.

It is essential for the quality of the bonding that the droplets of glue sprayed onto the chips by the nozzles 20 can be rubbed as uniformly and effectively as possible on the surfaces of the chips after spraying. Rubbing and conveying the material is carried out using mixing tools. Their tips typically have a peripheral velocity of about 1000 m / min. The residence time of the chips mixed with the mess should be so long: f; that sufficient abrasive bonding to the chips will occur. However, abrasion should not: ** ·· 25 be too strong not to reduce the particle size of the chips • • · *; The forward driving effect of the tools can be changed by rotating them ··· * at appropriate mounting angles. Of course, the length of the glue mixer chamber * must also be sufficient.

\\ Y 30 Surface and central loading mixers in the chipboard process have to operate within wide j * capacity limits. In the manufacture of thin particle board, the mass flow rate of glued: y: medium chip is relatively small, with the need for a large surface chip. In the case of thick plates the opposite is true, the need for glued surface chips »· · y, ve is small and the need for middle chips is high. The minimum flow of material to be bonded may be V \ 35 only 20% of the maximum. Due to capacity variations, the glue mixer has * · *! typically a continuously adjustable automatic so-called. a trailing flap for controlling the flow of material to be discharged so that the current of the mixer drive motor 2 117258 remains at the desired, suitably high level to achieve the aforementioned suitable rate of abrasion, even at partial capacities.

The problem with adhesive mixers with large diaper diameters is that the volume between the diaper 5 and the shaft is too large for adjustability of the chip residence time and the abrasion event. Especially when driving at partial capacities, the response to the adjustment is not rapid enough, because "braking" the rear flap to maintain a high degree of friction for filling or emptying a large volume. The glue mixer is fluctuating and the gluing performance is uneven, especially at the partial capacities.

It is an object of the present invention to provide an adhesive mixer which does not have the problems described above, particularly in large size adhesive mixers. The glue mixer according to the Kek-15 invention is characterized in that the center axis of the glue mixer increases after the gluing position when viewed in the direction of the chip mash advance.

A preferred embodiment of the adhesive mixer according to the invention is characterized in that at least 1/3 of the central axis is larger in diameter than the rest of the central axis, and said larger diameter is located downstream of the central axis in the direction of cutting.

t * '·: In another preferred embodiment of the glue mixer according to the invention,

Hi: ***: 25 le is characterized in that the ratio of the diameter of the thicker part of the central shaft * to the diameter of the thinner part is about 2.

· * ♦ i · **

In another preferred embodiment of the glue mixer according to the invention. characterized in that when the inner diameter of the chamber is about 900 mm, the diameter of the thinner part of the middle window is about 300 mm and the diameter of the thicker part is about n.

* ·; · * 600 mm.

Λ -m m ♦ * · * ♦ ·

Advantages of the invention can be mentioned that in high capacity adhesive mixers the adhesion of the adhesive to the chips is enhanced, the adhesive is more uniformly applied to the surfaces of the slides and the process is considerably more stable. In this case, it is possible to * * * • save on the amount of glue and thus reduce manufacturing costs. It is easier to control the filling level of the machine, ie the dwell time of the chips in the mixer. Adjusting the spindle flap 3 117238 can better influence the density of the cutting mass in the operating range of the mixing tools, since the cutting mass does not fall into the empty space of the rear of the machine.

The bonding process is much more stable, especially with part capacities while driving, since adjusting the flap does not cause unstable void filling and emptying.

The invention will now be explained in more detail with reference to the accompanying drawing, which shows an embodiment of an adhesive mixer according to the invention.

shown in the drawing, of the adhesive have a substantially cylindrical elongated chamber 1, in which the chips are fed to the direction of arrow A. The arrow B and discharged at a point indicated. In the center of the chamber is a longitudinally rotatable central axis 2 of the chamber to which mixing tools 3 are attached. These mixing tools are used to transport and grind the material within the chamber. The residence time of the chips in the mixer should be so long that sufficient rubbing to spread the glue on the chips can take place. The driving effect of the mixing tools 3 can be changed by rotating them to the appropriate mounting angles.

·· «: Reference numeral 4 represents a gluing station, known per se · *. ·. *: A plurality of glue sprayers 4 '. As shown in the drawing, the gluing station is: substantially arranged at the beginning of the mixing chamber 1 so that sufficient gluing of the glue to the chips can take place.

• M

ί • «·« · «·

In the apparatus according to the invention, the central shaft 2 is provided with a thickening 2 'in the region after the gluing spray zone. The adhesive spray zone has. however, it is preferable to keep the free space of the chamber as large as possible so that the adhesive is sprayed onto the chip particles so that they are not yet too tight • * *: · 'with respect to each other. Typically, about 1/3 to 1/2 of the length of the shaft is thickened, but the invention is not limited to this, but the length of the thickening is always feasible on a case-by-case basis. Of course, it is possible that one or more adhesive nozzles are also in the thicker area. However, the bulk of the gluing station l * \ 35 is prior to thickening.

• · i ·. * ί 4 117238

The distance between the inner casing 5 of the mixer chamber and the surface of the central axis 2, 2 'is reduced, e.g., in a 900 mm chamber, typically, e.g., from 300 mm to 150 mm. Thus, the thickness of the thickening after the glue spray zone is typically increased from 300 mm to 600 mm in order to bring the volume into a sufficiently small area suitable for process control. Thus, the ratio of the diameter of the thicker portion 2 'of the central axis to the diameter of the thinner portion 2 is about 2.

Reference numeral 6 denotes an automatic agitator flap for "braking" the ejected material flow so that the current of the agitator drive motor remains at the desired, high enough level to achieve a suitable degree of abrasion, even at partial capacities.

It will be apparent to one skilled in the art that the invention is not limited to the embodiments described above, but may be varied within the scope of the appended claims. Thus, for example, the central axle 2, 2 'may also be at least partially conical.

20 · 1 2 «• · · * 1 •» • ♦ ♦ ♦ · 1 »I1 • Φ 9 • · 1 • 9 · ··· • ft •« 999 • ft • 1 1 * · ft · 1 · i

IM

• «• ^ 1 • 1 * e · • · β

♦ M I

* · · * «•» • · 1 • 9 • I I 919 919

Ml • · * «* 9 9 9

Ml • «

»I

·· ♦ 9 2 • 19 9 9

Claims (5)

117238 PATENT REQUIRED KSET An adhesive mixer for applying and abrasive glueing mechanical woodworking particles, such as chips, prior to scattering or other further processing, wherein the adhesive mixer has a chip feed opening (A) at one end and an adhesive station (4) therebetween. , wherein glue is supplied to the glue mixer, and wherein the glue mixer chamber (1) is substantially cylindrical and longitudinally convex, and has a central rotatable shaft (2) mounted on substantially the entire length of the chamber with tools (3) for mixing and guiding the glue mixer in the chamber, characterized in that the diameter of the central axis (2, 2 ') of the glue mixer increases after the gluing station n (4) in the direction of cutting of the cutting mass. Adhesive mixer according to claim 1, characterized in that at least 1/3 of the central axis is larger in diameter than the rest of the central axis, and wherein said larger diameter portion (2 ') is located at the rear end of the central axis 20 as viewed in the cutting direction. : V Adhesive mixer according to claim 1 or 2, characterized in that ϊβ: *: that the ratio of the diameter of the thicker part (21) of the central axis is thinner; the part (2) has a diameter of about 2. * «· 25:. ·. Adhesive mixer according to Claim 3, characterized in that • * * [· * · [when the inner diameter of the chamber (1) is about 900 mm, the thinner part (2) of the middle axis is about 300 mm and the thicker part (2J) ) diameter n. . 600mm. ::: ··· · 30 # *** Adhesive mixer according to Claim 1 or 2, characterized in that the central axis (2, 21) is at least partially conical. ·· * • · • M • * · • • • · ··· 35 • · · · »· 6 117238