SE508733C2 - Method and apparatus for coating adhesive-coated surface with fiber flock - Google Patents

Abstract

The present invention solves the problem of controlling the amount of particles of fibres which are emitted in a nozzle from a gas flow when these are transported by the gas flow through a flexible hose or some other canal from a container. Due to the fact that the amount of fibres or other particles which are emitted can be controlled in a simple way, an accurate control of the density of a layer which is applied can be made, an even layer can be achieved and unnecessary material consumption can be avoided. The problem is solved primarily in that a gas flow containing the particles is conducted in a canal to a valve arranged where the particles are to be emitted, a second canal leads from the valve to a suction source and the vent comprises regulating means for controlling the size of the gas flows to the suction source and to the outlet of the valve. By means of this construction a continuous flow of fibres or particles can be guided towards the valve and that part which is not emitted to the nozzle is conveyed further by the suction source and is collected. By means of the above-mentioned method an application of fibres or particles in an adhesive layer, applied with, for example, melt adhesives or cold adhesives, may be guided during a course which can be continuous or intermittent.

Description

508 733 10 15 20 25 30 35 2 even layers can be achieved and unnecessary material consumption avoided.

According to the invention, the problem is solved primarily by directing a gas supply containing the particles in a channel to a valve located where the particles are to be discharged, a second channel is led from the valve to a suction source, and the valve comprises controls for controlling the size of an outflow of gas containing particles through the second channel, whereby also the remaining part of the gas supply is regulated and discharged to the mouth at the outlet of the valve. By this embodiment a continuous flow of fibers or particles can be led towards the valve and what is not delivered to the mouth is passed on by the suction source and collected.

By allowing the fibers or particles to be transported continuously in a gas flow in a channel, these will also have a higher and more even charge when they are charged in the channel (triboelectrically). fibers or particles that can be taken out via the valve from the friction method by means of the amount of continuous flow can also be considerably larger and the flow smoother than if they were not transported continuously in the gas flow past the valve. In addition, the ratio between the amount of fiber and the amount of air can be significantly greater. When, for example, applying fibers in an adhesive layer, the risk of film formation on the surface will therefore be less than if these were not transported continuously in said gas flow.

By the above-mentioned method, for example, an application of fibers or particles in an adhesive layer, applied by, for example, hot-melt adhesive or cold-adhesive technique, can be controlled during a process which can be continuous or intermittent.

Examples of such a process are, among other things, application to a plastic car, the function of the application is to eliminate squeaks and other details and components for assembly in which sounds that arise by adjacent parts moving and rubbing against each other. With the help of the present invention, existing technique / method, manual application of tape with textile surface, can be eliminated and replaced with an application of fiber flock which is performed in an automated process that is repeatable and measurable and thus possible to ensure quality. .

Further features of the present invention appear from the appended claims.

The invention will now be described in more detail with reference to the drawing.

Figure 1 schematically shows the construction of an apparatus used in the practice of the invention.

Figure 2 schematically shows the construction of a valve device (bypass unit) according to the invention.

Figure 3 shows schematically and in cross section the construction of a second embodiment of a valve device (bypass unit) according to the invention.

Figure 4 shows schematically and in cross section the construction of a third embodiment of a valve device (bypass unit) according to the invention.

As can be seen from Figure 1, an apparatus according to the invention is constructed with a flocking machine 1, which by means of a fan 3 from a container 2 delivers a controllable amount of flock F in a preferably air to a blowing duct 4. The blowing duct leads to a valve unit 6, suction duct 5 which directs an unissued part of the flock flow F gas flow, which is also connected to a vacuum pump 10 provided for a collecting container 11.

The collecting container ll be placed on top of the container 2 of the flocking machine but is normally separated from it by a partition wall 12, in which there can be an openable part for emptying to the container 2 of the flocking machine. The vacuum pump 10 is like a vacuum cleaner equipped with a filter unit 13. the air flow.

508 735 10 15 20 25 30 4 The valve unit or bypass unit 6 makes it possible to select different ratios between the openings A1, A2 and A3, whereby the amount of flock fibers 8 discharged to the nozzle 7 against a surface 9 can be varied and the remainder of the fibers from the blow channel 4 return via the suction duct 5.

An embodiment of a valve device (bypass unit) 6 according to the invention is shown in figure 3. In this the incoming fiber air flow F1 from the blow duct is arranged in line with the nozzle 7 with a valve 14 placed so that the suction duct catches the outgoing fiber air flow F2, led through the valve 14 A third embodiment of a valve device (bypass unit) according to the invention is shown in Figure 4. In this case the nozzle 7 is surrounded by a bellows or collar 15, which is intended to extend to the surface 9, which is to be covered. with fiber flock or other particles. A second suction channel 16 is arranged from the space surrounded by the bellows 15, whereby any remaining fibers in the bellows are led away. The second suction channel 16 can be connected to the suction channel 5.

Charging of the fibers to be delivered can take place in a known manner frictional charging at the nozzle and / or in the blow channel 4, placed in the fiber flow. by means of or by means of high-voltage electrodes The invention is not limited to the above-mentioned embodiments, but it can be varied in various ways within the scope of the claims.

Claims (10)

10 15 20 25 30 508 733 5 PATENT REQUIREMENTS Method for coating a delimited surface (9) with fi berflock, characterized in that the surface (9) is provided with an adhesive layer, that a stream of electrically charged fi wires which are diverted (8) from a nozzle (7) is directed towards the surface (9 ) and that the current with (8) charged fi fibers (8) from the nozzle (7) is regulated and interrupted by the fiber current being led from a channel (4) to the nozzle (7), vilket without which an adjustable amount of fi fibers is directed towards the surface (9) and the remainder of the er brer is passed through a suction channel (59 to a collecting container (11). A method according to claim 1, wherein the adhesive layer is a hot melt adhesive. A method according to claim 1, wherein the adhesive layer is cold adhesive. Method according to one of the preceding claims, characterized in that glue sticks and fi spreaders (8) for preventing squeaking and noise in mechanical structures which, after assembly, can come into contact with one another. Method according to one of the preceding claims, characterized in that the application of the lirn layer and the flow of fi to the lirn layer is carried out in an automated process. Method according to claim 1 for controlling the amount of fi fins (8) discharged ett from a gas fl by means of a disturbance nozzle (7) characterized in that the gas fl containing (b) (8) is led in a first channel (4) to a valve located at the nozzle where the brake is to be dispensed, that a second channel (5) is led (6) from the said valve (7) to a suction source (10), the van / id valve (6) comprises controls for controlling the amount of a gas containing from the gas. (8) through the second channel (5), whereby also the valve-controlled gas flow specified from the nozzle (7) is regulated. 508 735 10 15 6 Device for coating a glued surface (9) by means of fi glaciers (8) emitted from a gas fl desert, characterized in that gas fl desert containing fi glaciers is led in a first channel (4) to a valve (6) located where dispensed through a nozzle (7), a second channel (5) leading from the valve (6) to a suction source, (10) the valve comprising controls for controlling the magnitude of the fl fate of gas containing fi means (8) discharged to a nozzle ( 7) whereby the non-withdrawn part of the gas fl containing the fittings (8) is sucked away from the valve (6) through the second channel (5). Device according to claim 7, characterized in that the nozzle (7) is surrounded by a bellows (15) extending to a surface (9) to be coated. Device according to claim 8, characterized in that the space inside the bellows (15) is connected to a second suction material (16). Use of a method according to any one of claims 1 to 6 or a device according to any one of claims 7 to 9 for eliminating squeaks or other noises between surfaces which are brought into contact with each other by coating at least a part of said surfaces (9). with fi ber fl ock.