DE1183671B - Devices for adhering wood chips or similar bulk material with binding agents or sprayable or atomizable substances - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Class: B 29 j

German class: 39 a7-5 /02

Number: 1183 671

File number: H 356841 c / 39 a7

Filing date: February 21, 1959

Opening day: December 17, 1964

The invention relates to devices for adhering wood chips, in particular such flat or elongated training and behaving similarly, for example when throwing or Fall of debris whirling or fluttering in the air with finely dispersible additives such as liquids or powdery binder preparations, hardeners for the binder, water-repellent emulsions, Dye solutions and the like, in mixers known per se, which are equipped with nozzles or atomizers for to the binding agent or the like and circulating and loosening or throwing the bulk material Organs are equipped.

For example, for chipboard production, the wood chips or similar comminution products of vegetable raw materials are sprayed with the binding agent in the glue mixers. This is mainly done in throwing or compulsory mixers. The latter, which have a coaxially rotating circulating mechanism in a drum, are not charged too heavily with the material to be glued, so that the material picked up by the agitator blades wanders through the upper mixer chamber, in which the spraying takes place, in a state loosened up to the individual particles. In the throwing mixers, a throwing roller provided in the lower part of a casing or trough throws the chips more or less obliquely upwards for spraying. The chips then fall onto a sliding surface that feeds them back to the throwing roller. In other throwing mixers, the trough bottom has two parallel troughs for receiving one throwing roller each, which are separated from one another by a saddle-like elevation in the bottom. The two throwing rollers rotate in opposite directions in such a way that the material thrown into the spraying area falls onto the trough saddle, which guides it back to the rollers. The sheathing or trough roofing of these mixers, which are known in numerous special designs, is kept in terms of size and cross-sectional profile in such a way that the particles to be treated (chips) are not hindered in their loosened flight and fall. It is also proposed to arrange the nozzles on the drum or on one or some, usually longitudinally continuous bulges of this outside in such a way that the spray cones enter the interior of the drum through small openings in the jacket or the bulge. A throwing roller of much smaller diameter has also been provided on the upwardly striving inside of a rotating horizontal drum, which jets the material entrained by the rotation of the drum with devices for adhering wood chips
or similar bulk material with binders
or sprayable or atomizable substances

Applicant:

Dipl.-Ing. Max sky lifter,

Baiersbronn (Black Forest), Saarstr. 7th

Named as inventor:

Dipl.-Ing. Max sky lifter,

Baiersbronn (Black and White);

Walter KuIl, Freudenstadt, (Black and White)

throws into the drum room. The nozzles and their feed pipe, which passes through one of the non-rotating ones End disks passed through and additionally supported on the other end face are located in the upper part of the drum room.

In the arrangement of the nozzles or distribution elements for the binding agent or the like Spangut has taken the paint spray technique as a model, based on the jet or scattering cone is directed perpendicular to the surface to be sprayed, and one has in the known mixers the Nozzles or the like. Arranged so that their scatter cones or mist droplets and atomized substances also as perpendicular as possible to the moving chip streams, d. H. perpendicular to their direction of movement, hit. However, the investigations leading to the invention have shown that With this usual arrangement, it is far from the optimum in terms of bulk material adhesion and binder utilization can be achieved.

The invention is based on the knowledge that when sticking wood chips and the like Bulk goods, the individual particles of which are more or less flat or elongated, one in particular good utilization and favorable distribution of the sprayed or atomized binders or the like the special coordination of the movement processes of the chip or similar material and the sprayed material or atomized substances in the sense that the two movements, i.e. H. the of the chips flying for adhesion in the loosened state and those of the sprayed additives, largely run in the same direction.

409 758/359

In order to achieve this, the chips can in a manner known per se in a mixer, for example by a throwing roller, largely dissolved and thrown so that one more or less Flat-like throwing layer of the individual chip particles with an approximately parallel direction of movement the individual particles are created. Known nozzles, which are set up for direct liquid atomization or for atomization by means of compressed air will. According to the invention, the nozzles or the like, however, differ from the known devices arranged so that the liquid droplets leaving the nozzles one with the chip movement in the same direction, d. H. have approximately the same movement with the chips or on their Path cut the path of the wood particles at an acute angle. It is achieved in that the Liquid particles do not suddenly hit the sides of the chips that are facing the nozzles, but that the liquid veil and the swarf veil mix with each other in a much larger space and penetrate and that a substantially longer period of time elapses between impacts two droplets or dust particles directly following one another in their trajectory.

Since the glue particles only gradually lay on the flying chips and these during their During the flight, they usually still perform their own motion, flutter or turn, they will during this time not only applied on one side. Another advantage according to the invention is that due to the parallelism or the shallow angle of intersection of the trajectories, the liquid or dust particles are relatively long in the area of the chips and thus the risk of several droplets on the same Hit the spot or fly through the swarf veil unused and get on the inner wall or Deposit equipment parts of the mixer, is significantly less than with the usual vertical spraying.

The injection speed can be, for. B. adjusted by regulating the compressed air or the nozzles themselves be that the speed of the binder droplets is initially slightly greater than that of the Chips, so that they are initially acted upon from behind. The flight of the tiny droplets is made by the air resistance is soon delayed, so that further back in the trajectory the chips catch up with the droplets, so be acted upon from the front. The chips can depending on the requirements of the area of activity of the nozzles can be exposed once or repeatedly; the nozzles can also be in one or more rows be arranged, wherein nozzles can also be provided below the swarf curtain.

Examples of mixers equipped according to the invention are shown schematically in the drawing.

F i g. 1 shows a cross-section of a throwing mixer, in which the throwing roller 1 slants the swarf veil 2 throws up. The scatter cone or cones 4 of the nozzle or nozzles 3 are also directed obliquely upwards, wherein the nozzles are arranged so that their scattering cone the throwing material initially in the almost in the same direction of movement and then in the upper reversal zone of the trajectory parabolas, in which the chips remain in the meanwhile widened scattering cones for a relatively long time before they fall on a downward sloping surface, which feeds them back to the throwing roller. The setting shown the nozzles or their scatter cones for the same direction enforcement of the swarf and the subsequent encounter with the slow good particles passing over the fall is for the gluing of the chips particularly cheap.

F i g. 2 shows in cross section a rotating drum mixer in which the material is produced by the drum rotation is constantly fed back in a known manner to the throwing roller 1. In addition to Row of nozzles 3 with the scattering cones 4, a row of nozzles 3 'can be provided below the throwing roller, the scattering cones 4 'of which enter the shavings 2 from below at acute angles.

In Fig. 3 (cross section) and FIG. 4 (top view) shows a spreader mixer, apart from the spreader roller 1 and the nozzles 3 arranged, for example, in two rows according to the invention, a feed roller 5, which constantly feeds the dropped material back to the throwing roller. The feed roller 5 is expediently equipped with continuous blades, which are inclined to the axis when the device should work continuously. The illustrated combination of throwing roller 1 and feed roller 5 in the trough floor of mixer mixers has also proven itself to be excellent in mixers that otherwise are not equipped according to the invention, so that for this combination more independent Protection is requested. The nozzles 3 are set similar to the chip curtain 2 with regard to their scattering cone 4, like this with reference to F i g. 1 is described. By changing the distance between the nozzles Throwing veil 2 and its angle of inclination to this and the speed of the throwing roller, etc. can be Treatment of bulk goods that behave differently, the best design of the spraying resp. Adhesion process can be achieved.

The devices prepared or equipped according to the invention offer the following advantages: The sprayed or atomized particles are deposited more evenly on the chips.

There is no unused residue of the spray mist or dust in the possible exhaust air; all sprayed material is applied to the chips or the like.

The inner wall and internals of the device (the mixer) remain free from precipitation and only need to be cleaned very rarely.

The strength values, water repellency and the like are significantly increased - the transverse tensile strength, for example, by 30 to 50 ⁰ Zo - with the same binding agent, water repellant or the like, or binding agents or the like can be saved if the same values are striven for.

Also on throwing mixers equipped with two throwing rollers and on compulsory mixers, in particular if the latter are not filled too high and their impellers are capable of removing the chips or the like well To bring them loosely through the upper drum part, the arrangements according to the invention to be hit.

The mixer set up according to the invention can without impairing the described good effects in a manner known per se, e.g. B. by inclination in the longitudinal direction to the horizontal,

Special training of the circulating or throwing elements, baffles or the like, for continuous throughput operation be prepared.

Claims (6)

Patent claims: 1. Device for adhering wood chips or similar bulk materials with binding agents or other liquid or powdery substances either in a rotating drum or on a fixed casing with nozzles, atomizers or similar distributors for the binder od. Like. As well as loosening up in the interior with the material to be wetted and overturning, especially throwing organs and, if necessary, additional facilities for returning or forwarding the goods or for cleaning outer surfaces and the like. is equipped, characterized in that the nozzles or manifolds (3) of the Binder or the like. Are arranged in these mixers or on their sheathing so that the Direction of flight of the sprayed or atomized particles (4) that of those thrown up or is largely in the same direction in the loosened stream (2) flying good particles, preferably in such a way that the scattering cones emerging from the distributors are loosened in the same direction Cut moving or thrown goods at acute angles (Fig. 1). 2. Apparatus according to claim 1, characterized by the arrangement of the Netzgutverteiler (Nozzles 3 or the like) and the throwing or loosening circulating elements (1) to each other, in such a way that the spray or scattering cones (4) emerging from the distributors initially remove the veil primarily push through goods (2) that are thrown up at an angle or that are flying at an acute angle and then into the upper reversal zone of the flight or throwing parabolas of this good (below the apex of the parabolas in flight or in the material that is initially slowly sinking there) enter (Fig. 2). 3. With a throw element equipped device according to claim 1 or 2, characterized in that that wetting agent distributors (nozzles 3 'or the like) are also provided below the material thrown up or the throwing organ (1) are, the scattering cone (4 ') from below at an acute angle and in the same direction of movement in the flying goods enter (Fig. 2). 4. Device according to one of claims 1 to 3, characterized by known per se Devices on the wetting agent distributors (nozzles 3 'or the like) for regulating the exit speed the sprayed or atomized particles and on the circulating or throwing elements (1) their speed control. 5. Device, in particular according to one of claims 1 to 4, characterized in that a throwing roller (1) provided at the bottom of the casing and preferably rotating in the same direction with continuous blades (6) occupied feed roller (5) is arranged upstream, which the falling material (2) is constantly fed back to the throwing roller (FIGS. 3 and 4). 6. Device according to one of claims 1 to 5, characterized in that it is through Inclination of the drum, the casing or its bottom to the horizontal and / or training the mixing, circulating or throwing elements and / or by means of baffles or the like in per se is set up in a known manner for continuous operation. Considered publications:
German patent specifications No. 878104, 971067. Legacy Patents Considered:
German Patent No. 1085 327. 1 sheet of drawings 409 758/359 12.64 ι Bundesdruckerei Berlin