CN103547733A

CN103547733A - Fibre sorting system

Info

Publication number: CN103547733A
Application number: CN201280023764.1A
Authority: CN
Inventors: M.佩琳
Original assignee: Voith Paper Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2011-05-26
Filing date: 2012-05-08
Publication date: 2014-01-29
Anticipated expiration: 2032-05-08
Also published as: EP2714988A1; EP2714988B1; WO2012159876A1; DE102011076518A1; CN103547733B

Abstract

The invention relates to a method for removing long fibres from a fibrous material suspension. The aim of the invention is to separate out long fibres as simply as possible. Said aim is achieved in that a jet (1) of the fibrous material suspension is directed at the rotor blades (2) of a rotor, wherein the jet direction forms an angle of less than 45 DEG with the rotation axis (3), and longer fibres which adhere to the rotor blades (2) are thrown off owing to the centrifugal force of the rotor blades (2) and collected separately.

Description

Fiber sorting

Technical field

The present invention relates to a kind of for from the separated long stapled method of fibrous suspension.

The invention still further relates to a kind ofly for from the separated long fiber of fibrous suspension, in particular for carrying out the equipment of the method, it has the rotor with rotor blade.

Background technology

When preparing new fibrous suspension by timber or when changing the paper of recovery into fibrous suspension, fiber has very different length conventionally.Therefore, advantageously that short paper pulp fiber is separated with long paper pulp fiber, first this be in order to manufacture the page of different quality.

Generally the object at this is, obtains on the one hand the staple fibre cut that mainly comprises staple fibre, and the order of magnitude of its average length, for being less than 1 millimeter, obtaining and mainly contains long stapled long fiber cut on the other hand, and the order of magnitude of its even length is for being greater than 1.5 millimeters.

May interestedly be to obtain the long fiber cut that comprises long fiber and for example do not contain mineral matter equally.

But in most situation, utilize this device to prepare in this wise old paper fiber magma, make it again can be for the manufacture of fibrous cloth width as magma.

The old paper mixing conventionally consists of different types of paper and has compares the relatively wide fiber length ranges of fresh paper pulp.

For this reason, known by DE2018510, fibrous suspension is ejected on hole pattern, but wherein, hole is easy to stop up.

Therefore, in WO01/29297, advise, mesh element is stretched along nozzle.At this, metal wire or analog that mesh element is extended by the direction of motion along net form.Nozzle is positioned at the outside of the ring of mesh element.

This is still not fully up to expectations aspect fractionating effect.

Improvement aspect fractional method can realize by WO2010/018120, and wherein, columniform mesh element has the sorting being formed by bar and stitches.But manufacturing cost and to keep sorting to stitch unobstructed energy requirement by cleaning nozzle be relatively high.

Similarly situation is, should be by rinsing the less desirable component of defibre suspension.

For the present invention, concept fibrous suspension is also process water or the waste water that contains fiber, and wherein, the recovery of fiber is very important.

Summary of the invention

Therefore, technical problem to be solved by this invention, as far as possible simply and effectively realizes long stapled sorting.

By the present invention, this technical problem solves as follows: the beam of fibrous suspension points to the rotor blade of rotor, wherein, beam direction becomes to be less than the angle of 45 ° with shaft axis and sticks to longer fiber on rotor blade because centrifugal force gets rid of and collects individually from rotor blade.

Compare with the general use of net, by the risk that has hardly obstruction for the method from the separated long fiber cut of fibrous suspension of the present invention.Therefore, the present invention is also suitable for processing and has material denseness and be no more than 3.5%, the fibrous suspension of preferably to 3.5%.

In addition, the method is very efficient, because main only long fiber sticks on rotor blade and assembles, radially outward slides and get rid of from this on rotor blade.

For this can carry out as far as possible equably around shaft axis, the shaft axis that the beam direction of fibrous suspension bundle should be roughly parallel to rotor extends.

At this advantageously, the beam of fibrous suspension accelerated before hitting rotor blade.This acceleration causes fiber streamwise directed, and this contributes to trap long fiber by rotor blade.

In addition, shown advantageously, the speed of fibrous suspension bundle when hitting rotor blade between 3 to 20m/s and/or the peripheral speed of rotor blade between 10 to 70m/s.Preferably between 20 to 40m/s.Guarantee by this way, as far as possible only long fiber sticks on rotor blade, and wherein, the shared share of separated long fiber can increase by increasing peripheral speed.

In order not affect, long stapledly radially to skid off and get rid of, fibrous suspension bundle should be at least main, preferably only on the inner radial region of rotor blade, extends.

Therefore, especially when fibrous suspension bundle has the cross section of shaft axis annular, that surround rotor, can realize rotor blade utilizes widely.At this advantageously, the ring thickness of the fibrous suspension bundle of annular is between 1 to 5mm.

With regard to regard to equipment of the present invention importantly, the beam of fibrous suspension points on the rotor blade of rotor, wherein, beam direction and shaft axis angulation are less than 45 °, and rotor blade has the blade edge pointing to along direction of rotation and in getting rid of of rotor blade settled in an area territory, is provided with for get rid of the collecting chamber of that fall, longer fiber from rotor blade.

At this blade edge, should contribute to long fiber fraction collection, assemble and get rid of and fall in collecting chamber.Therefore advantageously, blade edge has the thickness between 0.2 to 2mm.

In order to ensure the staple fibre of fibrous suspension and filler as far as possible without difficulty from rotor blade by-pass flow, advantageously, rotor blade has flat, the cross section of preferably extending along direction of rotation or there is the cross section of wedge shape along direction of rotation, wherein, wedge grip points to and forms blade edge or be designed to metal wire or flexible silk thread along direction of rotation.

With the profile of rotor blade independently, contribute to long stapled radially skid off until along getting rid of of blade edge, fall be, blade edge is radially outwardly at least at a section, preferably at least outermost section relative radius extends obliquely against direction of rotation, wherein, should be between 30 ° to 70 ° in section and the angle between radius of this inclination.

Leading edge at rotor blade is not sharp-pointed, and while having certain circularity, the effect of rotor blade can also improve, and this for example can produce by electrobrightening.

For symmetrical structure, the shaft axis that the beam direction of fibrous suspension bundle should be roughly parallel to rotor extends.This can make fibrous suspension bundle be designed to annular and coaxially guide with rotor.

In addition, beam should point on rotor blade by the nozzle of accelerated beam.At this advantageously, the distance between nozzle and rotor blade is less than 20mm, is preferably less than 10 and be especially less than 5mm.

Between jet expansion and rotor blade, very little distance guarantees, due to the acceleration of beam in nozzle kept fiber until hit rotor blade all streamwise strengthen as far as possible fully orientation.

At this, with regard to efficiency, proved advantageously, rotor blade just length is between 5 to 30mm, preferably between 10 to 20mm and/or the diameter of rotor by the inswept disc of rotor blade between 300 to 1500mm.

Accompanying drawing explanation

Followingly by a plurality of embodiment, further set forth the present invention.In accompanying drawing:

Fig. 1: be the simple cross section by screening installation;

Fig. 2 and Fig. 3: be the top view with the rotor of different rotor blade 2;

Fig. 4 to Fig. 6: be by the cross section of different rotor blade 2.

The specific embodiment

As seen in Figure 1, the screening installation of the separated long fiber cut that mainly contains longer fiber of fibrous suspension for from for the manufacture of fine paper web face, the fibrous suspension bundle 1 of annular forms and points to the rotor blade 2 of rotor by being arranged on the formed body 8 of nozzle central authorities.

When fault or shutdown, in the nozzle body 13 and the gap before formed body 8 that limit beam 1 border from outside, increase.This realizes against the mobile of flow direction by nozzle body 13 simply in the embodiment shown in Fig. 1.This should prevent that gap from being stopped up by fiber.

Formed body 8 this impel the flow velocity of fibrous suspension 1 to increase and thereby make the strengthening of fiber streamwise and be orientated, this contributes to by rotor blade 2 trapping long fibers.For the orientation of fiber can not crossed doughtily and lose, the outlet of beam from nozzle and the distance between rotor blade 2 are 5mm only.

Rotor is driven by the motor 9 below being arranged at this.At this, the beam direction of fibrous suspension bundle is consistent with the axis of rotor 3, and wherein, the speed of fibrous suspension bundle 1 is when hitting rotor blade 2 between 3 to 20m/s, and the peripheral speed of rotor blade 2 is between 20 to 40m/s.If improve the shared share of long fiber of dividing by rotor blade 2, to improve the peripheral speed of rotor blade 2 for this reason.

When chopped fibers suspension bundle 1, most long fiber keeps hanging on rotor blade 2.It can be assembled and radially outward vacillate on rotor blade 2 due to centrifugal force at this place, then gets rid of.

In order to make to get rid of, fall to not being subject to fibrous suspension bundle 1 to affect, fibrous suspension bundle 1 only points to the inner radial part of rotor blade 2, and wherein, the thickness of ring is between 1 to 5mm, and the length of rotor blade 2 is between 10 to 20mm.

In addition, rotor is between 300 to 1500mm by the diameter of the inswept disc of rotor blade 2, even if this has also guaranteed enough production capacity in the relevant annular fibrous suspension bundle 1 of the flow velocity with making every effort to reach.

Because annular fibrous suspension bundle 1 is coaxially arranged with shaft axis 3, so obtain best and uniform effect.In order collecting from rotor blade 2, to get rid of the long fiber (long fiber cut) that falls, around rotor, in getting rid of accordingly the territory of settling in an area, to be extended with collecting chamber 6.The residue of fibrous suspension is collected in feeder 10 and discharges through rotor blade 2 and in its below.

In order to contribute to capture long fiber when the chopped fibers suspension bundle 1, rotor blade 2 has surface and thickness blade edge between 0.2 to 2mm 5 with regard to beam direction of electrobrightening.

With simple especially shape, rotor blade 2 can be formed by metal wire by Fig. 2, although metal wire extends point-blank at this, with respect to radius, against direction of rotation 4, tilts on 12 ground at an angle.By the inclination of blade edge 5, the long fiber sticking on blade edge 5 can more easily radially outward slide and fly into from here collecting chamber 6.

On the other hand, Fig. 3 illustrates rotor blade 2 and is positioned at rotor ring 11 possibility connected to one another of the end of inner radial and inner radial trend by it.In this way, rotor blade 2 can with rotor ring 11 jointly relative cost cheap by plate, made, wherein, thickness of slab between 0.2 to 2mm, rotor blade 2 along the width of direction of rotation 4 between 1 to 5mm.

At this, rotor blade 2, as shown in FIG. 5, can have cross section flat and that extend along direction of rotation 4.

But as alternative also feasible, rotor blade 2 correspondingly has the cross section of wedge shape with Fig. 4 along direction of rotation 4, wherein, wedge grip points to and forms blade edge 5 along direction of rotation 4.

This cross section also makes shorter fiber more easily by rotor blade 2.

For long fiber is more easily radially outward slided, blade edge 5, as shown in Figure 6, can radially outward observe along the beam direction of fibrous suspension bundle 1.

Therefore in a preferred embodiment, a plurality ofly by screening installation of the present invention, also can use common shaft axis and also use common driver 9.At these these screening installations, can work in series or in parallel.

Claims

1. for from the separated long stapled method of fibrous suspension,

It is characterized in that, the beam of described fibrous suspension (1) points to the rotor blade (2) of rotor, wherein, described beam direction becomes to be less than the angle of 45 ° with shaft axis (3) and sticks to longer fiber on described rotor blade (2) because centrifugal force gets rid of and collects individually from described rotor blade (2).

2. by method claimed in claim 1, it is characterized in that, the shaft axis (3) that the beam direction of described fibrous suspension bundle (1) is roughly parallel to described rotor extends.

3. by the method described in claim 1 or 2, it is characterized in that, the beam of described fibrous suspension (1) accelerates before hitting described rotor blade (2).

4. by the method one of aforementioned claim described, it is characterized in that, the speed of fibrous suspension bundle (1) when hitting described rotor blade (2) between 3 to 20m/s.

5. by the described method of one of aforementioned claim, it is characterized in that, the peripheral speed of described rotor blade (2) is between 10 to 70m/s, preferably between 20 to 40m/s.

6. by the method one of aforementioned claim described, it is characterized in that, improve described peripheral speed in case increase the shared share of isolated long fiber.

7. by the described method of one of aforementioned claim, it is characterized in that, described fibrous suspension bundle (1) is at least main, preferably only on the inner radial region of described rotor blade (2), extends.

8. by method claimed in claim 7, it is characterized in that, described fibrous suspension bundle (1) has the cross section of shaft axis (3) annular, that surround described rotor.

9. by method claimed in claim 8, it is characterized in that, the described fibrous suspension bundle (1) of annular has the ring thickness between 1 to 5mm.

10. one kind for separated long stapled from fibrous suspension, in particular for carrying out by the equipment of the described method of one of aforementioned claim, this equipment has the rotor with rotor blade (2), it is characterized in that, the beam of described fibrous suspension (1) points on the described rotor blade (2) of described rotor, wherein, described beam direction becomes to be less than the angle of 45 ° with described shaft axis (3), described rotor blade (2) has the blade edge (5) pointing to along direction of rotation (4) and is provided with for get rid of the collecting chamber (6) of the longer fiber falling from described rotor blade (2) getting rid of in the territory of settling in an area of described rotor blade (2).

11. by equipment claimed in claim 10, it is characterized in that, the shaft axis (3) that the beam direction of described fibrous suspension bundle (1) is roughly parallel to described rotor extends.

12. by the equipment described in claim 10 or 11, it is characterized in that, described beam (1) points to described rotor blade (2) by accelerating the nozzle of described beam (1).

13. by the equipment described in claim 12, it is characterized in that, the distance between described nozzle and described rotor blade (2) is less than 20mm, is preferably less than 10mm and is especially less than 5mm.

14. by the described equipment of one of claim 10 to 13, it is characterized in that, the length of described rotor blade (2) is between 5 to 30mm, preferably between 10 to 20mm.

15. by the described equipment of one of claim 10 to 14, it is characterized in that, described rotor is between 300 to 1500mm by the diameter of the inswept disc of described rotor blade (2).

16. by the described equipment of one of claim 10 to 15, it is characterized in that, the thickness of described blade edge (5) is between 0.2 to 2mm.

17. by the described equipment of one of claim 10 to 16, it is characterized in that, described rotor blade (2) has flat, the cross section of preferably extending along direction of rotation (4).

18. by the described equipment of one of claim 10 to 16, it is characterized in that, described rotor blade (2) has the cross section of wedge shape in direction of rotation (4), and wherein, described wedge grip points to and form described blade edge (5) along direction of rotation (4).

19. by the described equipment of one of claim 10 to 16, it is characterized in that, described rotor blade (2) is designed to metal wire.

20. by the equipment one of claim 10 to 19 described, it is characterized in that, described blade edge (5) radially outwardly at least at a section, be preferably at least that in outermost section, relatively described radius tilts against described direction of rotation (4).

21. by the equipment described in claim 20, it is characterized in that, in the section of the inclination of described blade edge (5) and the angle (12) between described radius between 30 ° to 70 °.

22. by the described equipment of one of claim 10 to 16, it is characterized in that, described rotor blade (2) is designed to flexible metal wire.

23. by the described equipment of one of claim 10 to 22, it is characterized in that, and described rotor blade (2), especially its leading edge is electrobrightening.

24. by the equipment one of claim 10 to 23 described, it is characterized in that, that described fibrous suspension bundle (1) is designed to annular and coaxially guide with described rotor.