KR930003395B1 - Process for preparation of waste paper - Google Patents

Abstract

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Description

Selection method of old paper

1 is a schematic representation of a primary material sorter.

2 is a representation of the horizontal structure of the process variant with the material decomposer in continuous operation.

* Explanation of symbols for main parts of the drawings

1: primary material decomposer 2: exhaust conduit

4: selector 11: roller

12: shaft 27: pump

The present invention relates to a high-definition selection method corresponding to the higher concept of claim 1. Such methods are described in Papier, Carton et Cellulose, July 1983, page 23.

In the above method, it is only possible to obtain a fibrous material which has been cleaned of impurities by a sorter connected subsequently to the first material cracker. Therefore, this is to ensure that the screen of the sorter must have a very large hole, so that the device does not close too soon in case of emptying of the first material cracker.

In this way too, the first material cracker is operated discontinuously, and the fiber suspension after the sorter can only be pushed down slightly. In this case, practically the entire fiber suspension must be cleaned again at different stages of the sorter.

The problem of the present invention is that in the case of maintaining a material decomposer of coarse contaminants, as little as possible equipment installation costs are possible to produce pure materials as quickly as possible, thereby avoiding costly trommel in this case. This problem is solved by the features of the feature part of claim 1 according to the invention. A particular advantage of this method is set by the high material density-decomposition method in the first material cracker. In this case, namely, the biggest problem with material crackers is usually the question of how to remove coarse contaminants from material crackers.

The invention is illustrated according to the embodiment shown in the drawings.

The primary material cracker 1 is shown schematically, from which the discharge conduit 2 is fed directly to the inlet joint 3 of the sorter 1 connected behind, without the need for an intermediate insert such as a screen. In this sorting machine, the roller 12 is installed while the shaft 12 rotates, which divides the material sections 7 and 9 of the material part 5 in the sorting machine 4, and the two parts It rotates in front of the flat screen which consists of (6) and (8).

The screen part 6 here has a relatively fine hole having a size of a hole smaller than 8 mm and the screen part 8 has a large hole of up to 30 mm but in any case a size larger than 8 mm. The material compartments 7 and 9 are then separated from each other by the partition 18. In the fibrous material section 9 in which the discharge junction 13 is also coarse in the material compartment 7, a corresponding discharge junction 14 is provided. The above distribution of the fiber suspension at the discharge junction 14 is directed to the intermediate barrel 20 using a pump 27.

For example, if 16% consistency was set in the material cracker, the old paper decomposed into the fiber suspension reaches the inlet joint 3 of the sorter 4 due to gravity.

In the instrument the fiber suspension is further diluted to allow for sorting through the holes in the screen portions 6 and 8.

In this way, in the intermediate cylinder 20, for example, the consistency may be 4 to 6%. Dilution water enters the device 4 via the junction 19. In the material compartment 7 there is a relatively clean material, which material has at least no coarse impurities and as a result only a little recleaning is required for them.

It is continuously pumped through conduit 29 using pump 23 for the next machining operation. In front of the screen, i.e. in the room in which the rollers 11 rotate, thicker dirt accumulates, which may lead to the closure of the screen part. Wash water is introduced through the conduit 19 into the appliance to prevent too soon closing of the screen, as a result of which another fiber material portion can pass through the screen portion 6 with finer holes. The large dirt portion can still be expected here, so preferably the valve 33 is closed and the valve 32 is opened, so that the amount of suspended material removed at this time can be separated out via the conduit 28 and taken out. .

During the above process, the valve 35 can also be kept closed at least partially at the beginning of this period. Experience has shown that after a certain time, only water without the large fiber content comes from the junction 13 or 14. At this time, all valves facing the junction 13 or 14 and located in the corresponding conduit are closed.

At this time, coarse dirt still remaining in the casing is dropped into the waste container through the discharge joint 15 and the valve 16 controlled by the operation unit 17, or it is cleaned when the valve 34 is opened using the washing water. It can be discharged into the conduit 25 via the junction 24. At this time, the final dehydration of the coarse dirt amount may also be a problem in order to recover the water.

During the cleaning process, the material breaker 1 is freshly charged while the valve 30 is locked, and a new decomposition process can be started. However, during the above disassembly process, the sorter 4 can be removed from the sorter 4 when the fiber suspension collected in the intermediate cylinder 20 is still open once again via the conduit 21 and the valve 31 is opened using the pump 22. It may continue to operate until it enters the inlet junction (3).

At this time the valve 26 is closed and the valve 32 or 33 is opened, preferably the valve 33 is opened, as a result of which a relatively washed fibrous suspension is obtained via the screen portion 6. In this case, it is considered that the incompletely decomposed waste paper is further divided by passing through the sorter 4 again under the action of the roller 11, so that a classifiable fiber component is obtained through the minute holes of the screen portion 6. You must.

The process described at the end of the above relates to discontinuous material decomposition operations. Even if the material cracker operates discontinuously, very continuous operation of the sorter 4 is obtained. In the continuous operation of the material decomposer 1, the discharge of the fiber suspension therefrom must be interrupted for only a short time for the cleaning process occurring in the sorter 4.

However, continuous material crackers generally operate at consistency less than 8% and have a material space separated from the cracking chamber by the screen, as a result of which there is yet another alternative to the sorter 4 as represented in FIG. You must install a connection.

Further preferably, the size of the hole of the screen portion 6 of the sorter 4 having the small hole lies between 2 and 5 mm, while the size of the hole of the screen portion 8 with the large hole is not smaller than 10 mm. Preferably 20 mm remains to be added. The material compartments, as represented, may also be placed concentrically with each other. The screen portion or screen region with fine pores serves a purpose that is larger than the other so that it allows a passage material that is at least 100% to 150% larger than other screen portions.

In FIG. 2, components or piping corresponding to FIG. 1 are indicated with the same reference numerals as those of FIG. In this process mode, at 8% material consistency, most of the fiber suspension is discharged from the material cracker 1 'through the conduit 38 via the screen 36 and introduced into the second material cracker 39. The life of the screen of the material cracker 1 ′ preferably has a size of a hole of 18 mm.

Such operating modes are known from US-PS 40 17 033. In the second material cracker described above, the screen separates the switch-and crack chamber 40 from the material chamber 41 as indicated. The turbine blade-shaped roller 42 is attached to the screen so as to be able to rotate closely. In this case the holes of the screen in the second material cracker preferably have a hole size of 3 to 5 mm. This material is transferred from the material chamber 41 to the discharge passage 47 via the conduit 46. Two material streams enriched with impurities are discharged from the decomposition chamber 40, i.e., material streams hatched with contaminants, particularly light contaminants, through conduit 43 and hatched with particularly severe contaminants via conduits 44. Material flow is discharged. At this point the heavy contaminant-material horn is preferably intermediately washed via the liquid cyclone 49. Both material streams are collected in the vat prior to their next cleaning.

The part enriched with the dirt from the first material decomposer 1 'is discharged through the pipe 2' when the valve 30 'is opened and the separator 4' corresponding to the separator 4 in FIG. Is introduced. The material discharged from the material compartment with severe contaminants due to the coarse dirt hole in the screen portion connected to the front is led to the material discharge conduit 38 of the first material cracker 1 in this case. Relatively clean material due to the microscopic holes in the screen portion connected to it reaches the outlet 47 as well via conduit 29 '.

By the above process, coarse contaminants are semi-continuously removed from the first material cracker 1 'because they are separated and separated in the fiber suspension reaching the conduit 2 and in the sorter 4'. . The discharge conduit 2 'leading to the sorter 4' is preferably connected to the crude discharge pipe 37 of the first material cracker 1 'which is constructed horizontally. Such connection possibilities of conduits 2 'are known from US-PS 39 89 197. In the sorter 4 ', the size of the holes of the screen portion is likewise preferably 2 to 5 mm for fine holes and 10 to 30 mm especially 20 mm for large holes.

The diverting chamber 50 of the sorter 4 is reduced in diameter by 10-25% compared to the inlet space at the inlet end (as is also the case in FIG. 1), whereby coarse or heavy contaminants are formed too large. It can be seen that the discharge junction 15 '(15 to 15) is collected and reached.

Claims (6)

Immediately after the first material decomposer operating at high consistency-in some cases the medium begins to soften by intermediate connection to the buffer and at least in part the degraded old paper unselected, i.e. at least on a large surface. In essence, the turbine blade-shaped rollers are rotatably arranged in front of a generally flat screen with all contaminant parts and are guided into the unit with a diverting chamber separate from the material section, whereby the sorter is still capable of If the containing material can be discharged from the material part, or if the casing is cleaned through a contaminant discharge conduit, then the high contaminant discharge junction is removed from the periphery of the cylindrical casing downwards through the large contaminant discharge junction. The above process in the selection method Two different areas 6, 8 of the screen or screen portion of the sorter 4 having at least overwhelmingly at the same time two different fiber material flows having two holes of different sizes by at least 6 mm in time by means of Selecting method of highland, characterized in that is discharged from the material portion (5) of the sorter (4) via. The screen portion according to claim 1, having a poor hole in the case of discontinuous operation of the first material decomposer 1 after discharge of the first material decomposer or in the case of closing of the screens 6, 8 of the sorter 4. 8) The material outlet 9 is attached to the lower part from the material compartment 9 connected at the rear, and then collected in the bin, and the amount of the fiber material discharged from the material compartment next is sorted in the sorting machine 4. Selection of Notices. In the apparatus for carrying out the method of claim 1, the sorting machine 4 forms an inlet 3 on the front side of the switching chamber, and out of the rotary vane and the rotary vane opposite the inlet to the sorting machine 4. The screen separating the switching chamber from the material section 5 of the array is arranged, in which case the screen has two parts (6, 8) or areas, the holes differing in hole size by 6 mm or more, in this case The small hole in the waste paper is characterized in that it is smaller than 8 mm and preferably 2 to 5 mm and the large hole is between 10 and 30 mm and the material compartments 7 to 9 belong to the respective screen portions 6 and 8. Selector. 5. The sorter of highland according to claim 3, characterized in that the material compartments (7, 9) lie concentrically with each other. 5. The screen portion or screen range 6 with fine pores according to claim 3 or 4 is much larger than the others, and the material material flow discharged by both screen portions 6, 8 is at least about 2: An upright selection device, characterized in that proportional to one. 5. The switching chamber according to claim 3, wherein the supply conduit of the suspension is connected to the inlet space on the front side in the center of the sorter 4 ′, the diameter of which is connected to the sorter 4 ′. An upright sorting device, characterized in that about 10-25% smaller than the maximum diameter of 50.

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