Vorrichtung und Verfahren zum Aufbereiten von Aufgabegut, insbesondere zur Reinigung von vorzerkleinertem, folienförmigem Aufgabegut

austrian

Patent Office

[0001] The invention relates to a device for the treatment of feed material, in particular for cleaning precomminuted, sheet feed material, in accordance with the preamble 1 as well as a corresponding method in accordance with the preamble protection protection 14.

[0002] Faced with increasingly scarce resources in the useful materials contained in the waste and recycling the processing obtains production cycle increasingly important. In the course of the processing condition for the re-use of the material grown from it is valent that this very largely free of impurities and adhesions such as labels, sticking remainders , sand, oil and other liquids, etc. is. Objective of the treatment of the feed material is therefore, separate from the valuable material adhering foreign matter.

[0003] Zum recycling waste plastic is known, for example, from DE 10 2006,054,770 A1 a method and a device, in which pre-crushed plastic flakes are mixed with water and by means of a solids pump Zahnscheibenrefiner be supplied as a suspension to one. In the refiner discs formed from axially opposite the plastic flakes are ground, while adhering are pulps and other impurities are grinding zone from the plastic dissolved. After subsequent mechanical dewatering of the suspension pulp and plastic are separated from each other.

[0004] As disadvantage turn out to the mixing of the flakes and the water in a container before their promotion for Zahnscheibenrefiner. The solids content of the suspension to be conveyed is 20% in weight and normally seen between 30% in weight, so that the on the solids content is relatively high and due to the associated pump output related energy needs in principle in question is there an economic operation. At the same time the solids content is the only difficult to verify the refiner applied suspension, with the result that the yo-yo Zahnscheibenrefiner supplied suspension has the solid contents. The unsteady starting conditions during the material preparation from the rotating refining plate exerted an adverse influence on the quality of the treating material and the hydrodynamic pumping action.

[0005] Against this background, the task of the invention is to be found, to specify an improved apparatus and an improved method for the treatment of feed material.

[0006] This problem is solved by a device having the features 14 1 and a method having the features protection protection.

[0007] Advantageous embodiments result from the subordinate claims.

[0008] The basic idea of the device is, the feed material and to supply the liquid in separate streams of agitation zone , where they substantially solid phase and liquid phase are mixed with one another and as are processed. This does not exclude that the feed material is added before entry into the liquid already agitation zone , but in such small-scale that the solids content is not less than 75% in weight decreases. The agitation zone and allows a very efficient feeding of the feed material for an accurate adjustment of the mixing ratio of solids to liquid fraction in the agitation zone within narrow limits. The context of the treatment of the feed material in the constant agitation zone remain thus, what finally reach a consistently high quality of the product obtained in the course of the treatment leads.

[0009] the invention are explained in more detail with reference to an embodiment illustrated in Figures wherein additional features and advantages of the invention are disclosed.

austrian

Patent Office

[0010] It shows

[0011] Figure 1 a schematic view to a treatment plant with a device according to the invention,

[0012] Figure 2 a longitudinal section through the illustrated apparatus on a larger scale in Figure 1, and

[0013] Figure 3 a flow chart representing the course of the process.

[0014] Figure 1 shows an installation for the treatment of the invention 1st precomminuted sheet feed material by means of a device in the form of a plate grinder with dry feed material 2 for victualling The Appendix here includes a Dosing hopper tank is filled with a liquid and a, for example, from pre-comminuted plastic flakes are formed with a 3. The feed material 10 mm to 30 mm size of about; the liquid consists of water, optionally supplemented by additives for achieving an improved treatment. The The disc refiner 1 is fed from the metering hopper 3 with liquid 2 with feed material and from the tank. In order to facilitate a modular combination with other plant components 1 and 2 and 3 are both the disc refiner in a transportable frame structure 37 of steel profiles Dosing hopper integrated tank.

[0015] 1 and in particular from Figure 2 the disc refiner from Figures as indicated 4 has a cylindrical housing 1, its rear wall 6 is held by a shaft bearing 5, the turn is solidly fixed in the frame structure engages 37. The shaft bearing 7 about a horizontal axis 6 is used for rotatably receiving a rotary shaft 7 extends through a central opening 8. The shaft 5 and carries in the rear wall 4 with its end lying within the housing in a rotationally fixed manner on the shaft end 8 is seated. 9 end of the shaft opposite refining plate 23 coupled to a rotary drive The.

[0016] 5 facing away from the rear wall 9 are on the front side of the in the outer circumferential region concentric with the axis 7 first machining tools refining plate 10 arranged, with 9 extending axially from the front side of the refining plate, on a plurality of concentric this release with respect to the axis 7 arranged teeth 11.

[0017] 7 immediately surrounding the axis 9 is of central region of the refining plate The a conical baffle 12 formed, whose tip is in the axis 7 from the refining plate 13 is equipped with strips 9 and of which the shell collects out, the extend from the apex to the peripheral region of the baffle 12. Am outer periphery of the radially extending wings 9 are in uniform circumferential distance first refining plate 14 arranged, the 9 a pumping action in the course of the rotation of the refining plate unfold. On the back of the refining plate 9 one sees also second wing 15, the also support the pumping action of the rotating refining plate 9.

[0018] 4 front wall of the housing 16 is formed of an enclosure door The, pivoting about a vertical axis, so as to ensure access to the housing interior. In the housing door 7 is a central opening 17 provided to the axis 16, via which the feed of the device 1 with feed material and liquid occurs. On the inside of the casing door 16 18 17 second fixed machining tools are set around the opening, the face 10 at an axial distance to form a working gap 19 the first machining tools. Even 18 have axially extending teeth 20 on the second working tools, are arranged in concentric circles. By a radial offset of the teeth 10 with respect to the teeth 11 of the first machining tools 20 the second machine tools is a meshed arrangement of the first 10 and second 18 18 possible processing tools machining tools.

[0019] 16 and baffle 21 mixture gap 12 form a housing door, the forms together with the working gap 19 a agitation zone , in which the treatment of the mixture of feed material and liquid occurs. By axial adjustment of the refining plate 9 is the width of the working gap 19 and thus the intensity of the treatment of the feed material adjustable.

austrian

Patent Office

[0020] a feed device 16 closes to the central opening 24 in the form of a screw conveyor 17 on the casing door, whose running coaxially with the casing door 16 is connected fixedly snail coat 25. The supply means 24 opens on fleas the axis 12 of the baffle 7 in the opposite thus mixture gapsnail coat 21 25 shall issue a co-axially extending worm shaft 26 on. The, whose snail coat 27 has a circumferential spiral conveyor 25-lying portion within the outside-lying portion 28 is coupled to a rotary drive and their. The Flohlwelle 26 is formed as a worm shaft, one end of which opens centrally into the 21 mixture gap can be loaded with liquid and the other end.

[0021] Thetask pit 24 25 29 takes place via a feed of the conveyor screw in the snail coat , the 2 by means of a metering device in the form of a metering screw 30 from the metering hopper is fed with feed material. The feed material in the region of the metering device 30 can the materials are conveyed In order to facilitate liquid are fed in small quantities, wherein the solid content above 90 wt.- %, however, remains, preferably above 95% in weight. Another liquid feed may take place either in the region of the feed device 24, wherein the solids portion of the feedstream agitation zone at least 75 wt % prior to its entry into the, preferably at least 80 wt- %.

[0022] In order in this way to substantially dry with the charging material 3 in the tank 1 the disc refiner in a predetermined delivered liquid stocked to supply 10 and the machining tools 18 mixing ratio, the disc refiner has a plurality of nozzles 1, the lead into the 21 mixture gap. A first nozzle 31 is formed from the end of the hollow worm shaft 26. Further eight nozzles 32 are concentrically arranged in uniform circumferential distance around the opening 17 in the housing door 16. 31 and 33 are fed via a line system with 32 nozzles The liquid from the tank 3, wherein a pump 34 provides for the necessary pressure. Over 35 36 the supplied amount to the valves 31 and 32 and liquid over the nozzles can be adjusted differentiated. Additionally lacks can be arranged on the rear wall 5 or more further nozzles, over the liquid 4 will be promoted mixed into the interior of the housing, where it joins the flow of material leaving the working gap 19. After supply of the liquid over the nozzles 31 and 32 is a maximum of 20 wt.- % of the solids content of the feedstream still, preferably a maximum of 12 wt. %, 1 wt- % minimum solid content preferably at least wherein the.

[0023] Back inmixture gap 21, where an intensive mixing of the feed material is effected with the liquid, but above all in the area of the working gap act on the feed material 10 a strong frictional forces, the for separation therefrom foreign matter from the surface of the feed material are causally. As a result of the addition of liquid remains in the region of the the invention the feed material passing through the working gap substantially uncomminuted agitation zone , what impact that will foster subsequent process steps.

[0024] After the radial exit from the working gap the treated feed material 22 are loaded with foreign matter and guided tangentially from the liquid via the outlet 1 and subjected to mechanical drainage The disc refiner, for example in a centrifuge, where the separation and thus recovering the separated from foreign matters from the rest of the flow of material is effected feed material.

[0025] Figure 3 is the expiry of the process according to the invention on the basis of a constitute flow chart. One can see clearly the two initially separate material streams (feed material/liquid), the only Merging agitation zone.