FI73263C - REFERENCE TO A CONTAINER CONTAINING AVAILABLE MATERIAL FRAON EN TRANSPORTGAS. - Google Patents

Description

1 73263

This invention relates to a method and apparatus for continuously separating a particulate material, in particular a strip-like material such as a paper web edge band, from a gas used as its transport medium, usually air. In particular, this invention relates to a method in which a mixture of a particulate matter and a carrier gas is fed to a closed separator, separated from the particulate matter in a separator, vented from the separation space, and the separated particulate matter removed from the separation space.

Before winding the paper web coming from the paper machine, an uneven edge part is cut from both edges, the so-called edge band. With the speed of paper machines constantly increasing, the removal of these edge strips has not become a particular problem. The edge strips are usually removed from the cutting point by means of an ejector or a so-called shredder blower, in each of which the edge strip or pieces thereof are transported under overpressure. However, these solutions have certain disadvantages which have been eliminated by removing the edge strips from the cutting site by so-called suction transport, whereby the edge strips are separated from the air acting as a transport medium before the blower providing the suction. Relatively large volumes of air have to be used to transport the edge strips and the separation of these air volumes from the edge strips has proved problematic. In the above-mentioned suction transport, some liquid has had to be fed to the separation chamber arranged before the blower in order to stop the movement of the edge strips and to transport them to a mixing tank, which at the same time has acted as a liquid lock. However, it would be advantageous if the edge strips could be recovered and separated from the air used as the transport medium without the use of any liquid.

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It is therefore an object of the present invention to provide a method for continuously separating a particulate material, such as a strip or material, from a gas, such as air, used as a transport medium, without the use of any liquid to stop or transport the particulate material away from the separator. It is a further object of the invention to provide an apparatus for continuously separating a particulate matter from a gas used as a transport medium, which device operates without liquid, with a higher efficiency than usual, and from which the particulate matter is recovered in a very small space-compressed form.

The main features of the invention appear from the appended claims.

According to the present invention, the separation of the particulate matter from the gas used as its conveying medium is achieved by filtering a mixture of the particulate matter and the gas and compressing the particulate matter while mechanically passing it through a closed separation outlet. According to the invention, this is achieved by a device in which the particulate matter separation and removal means are at least one routed surface movable towards its outlet in an endless separation chamber forming a converging discharge channel with a fixed wall of the separation chamber or another endless surface moving towards its outlet. The separating and removing means for the particulate matter then act as both a press and a shut-off bait.

The endless surface moving towards the outlet of the separation chamber is perforated, the means for removing gas from the separation chamber being arranged on the opposite side of the endless perforated surface with respect to the supply means of the mixture of particulate matter and transport gas. In this case, the separating and removing means for the particulate matter act not only as a press and a shut-off feeder but also as a screen, separating the particulate matter from the transport gas.

The surface or surfaces moving towards the outlet in the separation chamber are preferably endless flexible track mats guided over rotating rollers, which preferably have holes substantially smaller and / or at least substantially different in shape than the pieces to be separated.

The particulate outlet is then preferably formed by a pressing point between the two rollers, whereby at least one of the rollers may be perforated and provided with a discharge zone on its peripheral part on the separation chamber side or act as a guide roller for said endless flexible track.

The transport of a piece of material can be done either by pressing! imukuljetuksena. In suction transport, the suction side of the transport pump is connected to the inside of the endless flexible track to suck gas through the perforated track and the material path passing over it.

The invention will be described in more detail below with reference to the accompanying drawings, in which Figures 1 and 2 show two schematic cross-sectional side views of preferred embodiments of the invention.

In Fig. 1, the separation chamber is generally indicated by reference numeral 4 and has an inlet at the top for feeding a mixture of a piece of material such as paper web edge strip and its conveying gas such as air to the separation chamber 4. The separation chamber 4 further has outlets 2 on both sides for removing air separated from the edge strips. - - 17 4 73263 mios. The outlets 2 are connected to the suction side of the fan (not shown). The transport of the edge strips separated from the paper web to the separation chamber 4 thus takes place as a suction transport. Separating the edge strips from the air used as the transport medium and possibly filtering this air before the fan saves the fan and thus increases its service life.

Inside the separation chamber 4, two endless track mats 5 and 5 are arranged, which are guided over rotating guide rollers 6, at least one of which is forced-operated. The rollers 5 and 5 'are preferably perforated, the size and / or shape of the holes being such that the edge strips cannot penetrate through them.

The guide rollers 6 of the tracks 5 and 5 'are arranged and the tracks 5 and 5' are guided so that the tracks form a channel tapering towards the outlet 3 of the edge strips separated from the inlet 1 of the separating chamber 4, where the air-conveyed edge strips from the inlet 1 are gradually compressed. and mechanically moved towards their outlet 3. The tracks 5 and 5 'then act not only as a conveyor but also as a press, a filter and a shut-off feeder. In this way, air is effectively removed and separated from the edge strips while the edge strips are compressed to a small size, making them easy to handle after the separation chamber.

In order to maintain a vacuum in the separation chamber 4, there are sealing members 7 between the rollers 5 and 5 'and the wall of the separation chamber 4, in addition to which the lower guide rollers 6 of each roll 5 and 5' are sealed 7 in the wall 8 between them.

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It will be clear to a person skilled in the art that at least one of the track 5 and 5 'shown in Fig. 1 can be replaced by a fixed or movable wall, such as a movable wall formed by the circumference of a rotating roll, as shown in Fig. 2.

In Fig. 2 a flexible perforated roller mat 5 is arranged over two rotating guide rollers 6, between the rollers 6 of which there is a wall 8 sealed to the rollers 6 by seals 7. One of the rollers 6 is further sealed to the separation chamber 4 by a seal 7 while the other guide roller 6 cooperates to the wall of the separation chamber 4 with a seal 6 'sealed by a seal 7, forming a pressing point through which the roll mat 5 and the air-separated edge strip on it are removed from the separation chamber 4. Air fed to the separation chamber 4 as a mixture with the edge strip and air separated through the roller 5 in the separation chamber 4 is removed. between the wall 8 connecting the guide rollers 6 from the tile box 2.

It will be clear to a person skilled in the art that the flexible endless track can be replaced by a perforated cylinder surface with a discharge zone inside the cylinder with a sector section opening into the separation chamber 4, whereby the separated air is removed from the separation chamber.

Claims (8)

A method for continuously separating a piece material from gas used as its transport medium by feeding a mixture (1) of the piece material and the transport gas to a closed separation space (4), separating the piece material from the transport gas in separating space (4), discharging gas (2) from the separation space and removing the separated unitary material from the separation space, characterized in that the mixture is filtered and the unitary material is compressed simultaneously as it is mechanically passed through an outlet opening (3). the enclosed separation space (4). Process according to claim 1, characterized in that the unitary material is compressed both mechanically and by maintaining a pressure difference on both sides of the unitary material flow which is compressed. 3. A device for continuous separation of a piece material from gas used as its transport medium, comprising a closed separation chamber (4), means (1) for feeding a mixture of the piece material and the transport gas to it. the separating chamber, means (2) for removing the gas from the separating chamber and means (5, 6, 6 ') for separating and removing the unitary material from the closed separation chamber, characterized in that the separating and removing means of the unitary material are at least one endless in the separation chamber (4) towards its outlet opening (3) movable perforated surface (5) forming a tapered outlet channel with the fixed wall of the separation chamber or another endless, in the separation chamber against its outlet opening (5 ', 6'), 2) for removing the gas from the separation chamber (4) is arranged on the opposite side of the endless, perforated surface (5) with respect to the feeding means