Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
  • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
  • D21D1/20—Methods of refining
  • D21D1/30—Disc mills
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C7/00—Crushing or disintegrating by disc mills
  • B02C7/02—Crushing or disintegrating by disc mills with coaxial discs
  • B02C7/06—Crushing or disintegrating by disc mills with coaxial discs with horizontal axis
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C7/00—Crushing or disintegrating by disc mills
  • B02C7/11—Details
  • B02C7/12—Shape or construction of discs
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
  • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
  • D21D1/20—Methods of refining
  • D21D1/30—Disc mills
  • D21D1/306—Discs

Definitions

• the invention relates to a method for producing a clothing for the treatment of aqueous suspended pulp in a treatment gap, consisting of a base body with treatment elements facing the gap.
• the invention also encompasses a clothing for treating aqueous suspended pulp in a treatment gap bounded by two treatment surfaces rotating relative to each other about a rotation axis and formed by sets, consisting of a base body with treatment elements extending radially to the gap, elongated and at least one directional component with the method according to the invention.
• sets are to be suitable for the mechanical treatment of suspended pulp material. This means, above all, the grinding of paper fibers, the dispersion of impurities and fibers, and the de-staining, ie the dissolution of fiber agglomerates.
• Trimmings are z. B. in grinding machines - so-called refiner - installed.
• the suspension in refiners has a solids content of about 2-8%.
• the mechanical processing taking place therein can detect the entire fibrous material, thus also dispersing the impurities contained therein.
• Such machines have at least one rotor and at least one stator with either disc-shaped or conical surfaces on which the trimmings are mounted, so that gaps can form between them.
• Many trimmings have webs and grooves on the work surfaces, which is why we also speak of "knife trimmings".
• Other trimmings are in the form of toothed rings. It is known that in addition to the shape of such webs, grooves and teeth and the material of which they are made, has effects on the processing of the pulp.
• the trimmings are subject to wear and must therefore be replaced at certain intervals. In addition, wear can cause the machining effect to change during the service life.
• a significant portion of the operating costs associated with the mechanical treatment of pulp in the pulp and paper industry stem from energy costs. Therefore, it has always been an effort to build sets and the machines used and operate so that - measured by the desired success - not too high energy consumption is required.
• the object of the invention is to increase the freedom of design in such sets with economically justifiable effort.
• this object is achieved in that the treatment elements are at least partially applied in layers of a liquid or solid material and thereby subjected to a physical or chemical curing or melting process.
• a core of the treatment elements is integrally connected to the base body and at least an outer region, preferably facing the treatment gap, outer part of the treatment elements layered from a liquid or solid material and thereby a physical or chemical curing or melting process is subjected.
• the treatment elements can be provided with a wear layer. If the color of the core differs from that of the outer part of the treatment elements, it can be concluded that the wear limit has been reached via the color change.
• the core of the treatment elements not only acts as a connecting element to the body but also reduces the amount of required and usually expensive, wear-resistant material. However, if more space is to be given to the arrangement and design of the treatment elements, it is advantageous if the treatment elements are applied as a whole in layers of a liquid or solid material and subjected to a physical or chemical hardening or melting process.
• the layered material is usually expensive, a cheaper, different material can be used for the base body. Because of the high load in such machines for grinding, dispersing or deflaking of fiber materials, the layered material should be applied be powdered and / or comprise one or more metals or metal compounds.
• the layered material is sintered or fused by means of laser.
• the surface roughness of the treatment element can be influenced by the grain size of the powder.
• the manufacturing method according to the invention makes it possible to select materials according to the specific requirements, which is why at least part of the surface of the treatment elements, each of two side surfaces and the intermediate upper side facing the gap, should consist of a material which differs from the material of the Body differentiates.
• the treatment elements can be made very wear resistant with minimal use of expensive materials such as tungsten carbide.
• treatment elements should in particular consist entirely of a material which differs from the material of the base body.
• this profile of the top of the treatment elements is formed by recesses which are delimited by webs extending therebetween and also at the edge of the top by webs forming part of the side surface of the treatment elements. Because of the high stress on this profile during the rotation of the treatment surfaces or the treatment of the pulp suspension should at least along one side surface of the treatment elements, which preferably at a rotating treatment surface in the direction of rotation and a fixed treatment surface opposite to the direction of rotation (the other, rotating treatment surface), the webs have a greater width than the webs extending between the recesses.
• a comprehensive protection of the profile regardless of the direction of rotation can be ensured by having along both side surfaces of the treatment elements, the webs, which form part of the side surfaces, a greater width than the extending between the recesses webs.
• At least the outer region of the treatment elements lying below the profile is completely filled with the corresponding material over a thickness of at least 2 mm, preferably at least 4 mm , wherein the density of this material in the sections with overlying webs is higher than in sections with overlying recesses.
• the profile of the treatment elements is removed as a result of wear, material is increasingly being loosened or washed out of the recesses so that a certain tread depth remains ensured over a long service life.
• the dissolved material is not critical to the pulp processing process because of the small amount of material relative to the amount of pulp being treated.
• treating machines for pulp processing have circular or annular treatment surfaces, which are composed of several sets. In this case, the advantages of the manufacturing method according to the invention in terms of manufacturability and cost-effectiveness, in particular, when the main body, the shape of a circular segment or a
• Circular segment has and the product of segment angle (in °) and the circle diameter (in cm) is greater than 6000, preferably greater than 6500.
• the manufacturing process according to the invention allows larger sets and thus reduces their number per treatment area, which improves the homogeneity of the treatment.
• the circle diameter of the body should be between 35 and 150 cm.
• the thickness of the body is less than the height of the treatment elements and in particular less than 85%, preferably less than 75% of the height of the treatment elements.
• the outgoing from the body height of the treatment element can be reduced at the same operating time, which in turn simplifies their stratified order.
• there is a reduced idle power of the machine, with a small amount of treatment elements is beneficial.
• the height of the treatment elements should be at least partially, preferably entirely below 5 mm, preferably below 4 mm.
• the production method according to the invention in contrast to conventional casting, allows very narrow treatment elements and equally small distances between adjacent treatment elements.
• the treatment elements parallel to the base should have an elongated cross-sectional shape and at least partially, preferably entirely a width between 0.1 and 5 mm, in particular between 0.1 and 1 mm and / or the distance between adjacent treatment elements at least partially, preferably entirely between 0.1 and 5 mm, in particular between 0.1 and 2 mm.
• the radius at the transition between the base body and treatment element is less than 1 mm, preferably less than 0.3 mm and the treatment elements can be implemented without Ausformschräge. This leads to a larger open groove surface, a better conveying effect of the trimmings and an optimal use of the treatment surface.
• the inventive method now also allows undercuts in the treatment elements.
• the direction of rotation should be in the case of a rotating treatment surface Side surface of the treatment elements with respect to a perpendicular to the rotation direction against the rotational direction to be inclined.
• the elongate treatment elements are at least partially odd, i. are curved or have a kink.
• FIG. 1 shows a schematic cross section through a grinding arrangement
• FIG. 2 shows a plan view of a set 2, 3 of the grinding arrangement
• FIGS. 3-6 partial cross sections through different sets 2,3 and
• FIGS. 7-9 plan views of two different treatment elements 6.
• a grinding gap 4 is formed by a fixed grinding surface coupled to the housing and a grinding surface rotating about a rotation axis 15.
• the two annular grinding surfaces treatment surfaces parallel to each other, wherein the distance between them is usually adjustable.
• the rotating grinding surface is moved here in the direction of rotation by a rotatably mounted in the housing shaft 16.
• the shaft 16 is driven by a
• the fiber suspension 1 to be ground passes via an inlet through the center into the grinding gap 4 between the two grinding surfaces.
• a supply via openings in the clothing is possible.
• the fiber suspension 1 passes the cooperating grinding surfaces radially outwards and leaves the adjoining annular space through a drain.
• Both grinding surfaces are each formed by a plurality of circular segment or annular segment-shaped grinding sets 2,3 according to Figure 2, which extend over in each case a peripheral segment of the corresponding grinding surface.
• the sets 2,3 are, as shown in Figure 2, each formed by a base plate 5 with a plurality of substantially radially extending, strip-shaped treatment elements 6 and grooves 9 between them.
• the cross-section of the treatment elements 6, also called knives, is generally rectangular, as shown in FIGS. 3, 4 and 6, but there are also other shapes.
• one or both of the side surfaces 18 of the treatment elements 6, which are usually approximately perpendicular to the direction of rotation 17 of the grinding surface, may be inclined in or against the direction of rotation 17.
• a conveying effect in the grinding gap 4 and thus also an intensification of the fiber treatment is achieved if, as shown in Figure 5a-c, with a rotating grinding surface facing in the direction of rotation 17 side surface 18 of the treatment elements 6 with respect to a perpendicular to the rotation direction 17th is inclined opposite to the direction of rotation 17.
• both sides of the treatment elements 6 are inclined in the same direction.
• the opposite Rotation direction 17 facing side surface 18 may be inclined against the Roatationscardi 17 or as in Figure 5b perpendicular to Roatationsrichung 17.
• the variation of the inclinations of the side surfaces 18 is not limited to this, but can be done depending on the desired effect, for example, even with fixed grinding surfaces.
• the treatment elements 6 Parallel to the base 5, the treatment elements 6 have an elongated cross-sectional shape, wherein the treatment gap 4 facing upper side 19 of the treatment elements 6 is generally parallel to the outer surface of the base body 5.
• the treatment elements 6 often extend oddly over at least a radial section, i.e., at least over a radial section. curved, curled or bent as seen in Figure 2.
• the treatment elements 6 of the trimmings are at least partially applied in layers of a liquid or solid material and subjected to a physical or chemical curing or melting process.
• the main body 5 can be cast from a cheap metal and have the same shape for differently shaped sets 2.3. Even a reuse of the main body 5 is possible.
• the treatment elements 6 are subject to increased wear, which is why at least a portion of each formed by two side surfaces 18 and the intermediate, directed to the gap 4 top 19 surface the treatment elements 6 consists of a wear-resistant material, which differs from the material of the main body 5.
• the layered application of pulverulent material which comprises ceramics or one or more metals or metal compounds is particularly suitable.
• This layered material can then be sintered or fused by laser after each layer.
• the arrangement of the treatment elements 6 can be selected on the base body 5 as needed.
• treatment elements 6 consist entirely of a material which differs from the material of the main body 5. Therefore, the treatment elements 6 can be applied as a whole layer by layer from a liquid or solid material and thereby undergo a physical or chemical curing or melting process.
• the treatment elements 6 in FIGS. 4 and 6 each have a core 7 integrally connected to the main body 5.
• the arrangement of the treatment elements 6 is predetermined, on the other hand a very strong fixation on the main body 5 is ensured via the cores 7.
• FIG. 4 While in FIG. 4 the complete surface of the treatment elements 6 is produced in layers, in FIG. 6 this takes place only on the upper side 19 facing the treatment gap 4.
• tungsten carbide is suitable as the outer wear layer for the layered structure, wherein usually a thickness of this wear layer of 1 mm is sufficient. Since the layered material often differs in color from the material of the base body 5, a complete abrasion of the material applied in layers on the upper side 19 of the treatment elements 6 facing the gap 4 can easily be detected.
• At least the top 4 of the treatment elements 6 facing the gap 4 can be made profiled.
• This profile essentially comprises recesses 20 on the upper side 19 which are delimited by webs 21 running between the recesses 20 and also by webs 22 forming part of the side surface 18 of the treatment elements 6 at the edge of the upper side 19.
• the recesses 20 are formed by slots open towards the gap 4 and in FIG. 8 by open honeycombs. Since the profile is exposed to great stress, the webs 22 in Figure 8 along a side surface 18 of the treatment elements 6 have a greater width than the other, in particular extending between the recesses 20 webs 21st
• the reinforced webs 21 are located at a rotating grinding surface in the direction of rotation 17 and a fixed grinding surface in the opposite direction of rotation 17 (the opposite, rotating grinding surface) facing side.
• the webs 22 in Figure 7 along both side surfaces 18 of the treatment elements 6 have a greater width than the extending between the recesses 20 webs 21st It is also essential here that the outer region of the treatment elements 6 situated below the profile is completely filled with the corresponding material over a thickness of at least 4 mm, the density of this material being higher in the sections with overlying webs 21, 22 than in FIG Sections with overlying recesses 20 is.
• FIG. 3b While this difference in density in FIG. 3b extends, by way of example, over a substantial part of the treatment element 6, it can be found down to the core 7 in FIG. 6a.
• FIG. 9 shows an embodiment in which the course of the webs 21, 22, perpendicular to the upper side 19 of the treatment elements 6, changes.
• the treatment elements 6 here consist of several layers arranged one above the other towards the grinding gap 4, whereby the webs 21 of a layer extend essentially over the slot-shaped recesses 20 of the layer lying below ,
• the thickness 1 1 of the main body 5 can now be less than the height 10 of the treatment elements 6, which has a positive effect on the weight and the handling of the set 2.3.
• This in turn also makes it possible to select the segment angle 8 of the set 2,3 greater than usual, so that the product of segment angle 8 (in °) and the circle diameter (in cm) is greater than 6000, preferably greater than 6500.
• the circle diameter of the base body 5 is between 35 and 150 cm.
• the height 10 of the treatment elements 6 is here, for example, less than 5 mm, the width 12 of the treatment elements 6 between 0.1 and 1 mm and the distance 13 between adjacent treatment elements 6 between 0.1 and 2 mm.
• the new manufacturing process also allows at the transition between the base body 5 and treatment element 6 smaller radii 14 of less than 0.3 mm, which is positive for the conveying effect.

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• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Paper (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)

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Citations (6)

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• 2015
  • 2015-04-24 DE DE102015207536.2A patent/DE102015207536A1/de not_active Withdrawn
• 2016
  • 2016-02-22 EP EP18173135.7A patent/EP3398684B1/de active Active
  • 2016-02-22 EP EP18173097.9A patent/EP3398682B1/de active Active
  • 2016-02-22 CN CN201811464158.9A patent/CN109317253B/zh active Active
  • 2016-02-22 EP EP16707006.9A patent/EP3285931A1/de not_active Withdrawn
  • 2016-02-22 CN CN201680023864.2A patent/CN107530707B/zh active Active
  • 2016-02-22 KR KR1020177034121A patent/KR20170139156A/ko active IP Right Grant
  • 2016-02-22 CN CN201811464166.3A patent/CN109317255B/zh active Active
  • 2016-02-22 EP EP18173124.1A patent/EP3398683B1/de active Active
  • 2016-02-22 CA CA2983614A patent/CA2983614C/en active Active
  • 2016-02-22 CN CN201811464160.6A patent/CN109317254B/zh active Active
  • 2016-02-22 WO PCT/EP2016/053640 patent/WO2016169672A1/de active Application Filing
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