EP2780116A1 - Injecteur pour un solide granulaire - Google Patents

Injecteur pour un solide granulaire

Info

Publication number
EP2780116A1
EP2780116A1 EP12791136.0A EP12791136A EP2780116A1 EP 2780116 A1 EP2780116 A1 EP 2780116A1 EP 12791136 A EP12791136 A EP 12791136A EP 2780116 A1 EP2780116 A1 EP 2780116A1
Authority
EP
European Patent Office
Prior art keywords
section
central tube
annular gap
mixing
injector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12791136.0A
Other languages
German (de)
English (en)
Inventor
Oskar Stephan
Reiner Witt
Ulrich Schröder
John Joseph Louden
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Priority to EP12791136.0A priority Critical patent/EP2780116A1/fr
Publication of EP2780116A1 publication Critical patent/EP2780116A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71745—Feed mechanisms characterised by the means for feeding the components to the mixer using pneumatic pressure, overpressure, gas or air pressure in a closed receptacle or circuit system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/042—Outlets having two planes of symmetry perpendicular to each other, one of them defining the plane of the jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1481—Spray pistols or apparatus for discharging particulate material
    • B05B7/1486—Spray pistols or apparatus for discharging particulate material for spraying particulate material in dry state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/32—Mixing; Kneading continuous, with mechanical mixing or kneading devices with non-movable mixing or kneading devices
    • B29B7/325—Static mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7457—Mixing heads without moving stirrer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/461—Adjustable nozzles

Definitions

  • the invention is based on an injector for adding a granular solid into a mixing chamber, comprising a central tube for adding the granular solid, an addition device for adding a propellant gas surrounding the central tube, the central tube and the addition device surrounding the central tube form an annular gap at the end of the central tube, and a mixing section with a constant cross-section, which adjoins the annular gap.
  • an injector for adding a granular solid is used to make sanitary articles such as diapers, sanitary napkins, or similar products designed to hold and encase liquids.
  • superabsorbent particles are mixed together with fibers in a mixing chamber and applied as an absorber core on a support.
  • the addition of the superabsorbent particles takes place with an injector.
  • absorber cores of different widths.
  • different injectors are required for this purpose.
  • only absorber cores having a uniform structure can be produced.
  • the produced absorber cores have a uniform width.
  • a venturi nozzle unit for supplying particulate material is further described in WO-A 2009/073849.
  • the venturi nozzle unit includes an inner nozzle and an outer nozzle concentrically formed around the inner nozzle.
  • the inner nozzle has a conical shape and a crimped end portion, wherein in the crimped end portion a plurality of openings is formed. Through the openings, a propellant gas is supplied.
  • An adding device for a solid particulate material is further described in WO-A 2010/031742.
  • the injector is used to add superabsorbent particles for the production of hygiene products.
  • the setting of the injector via a displaceable in the injector inner tube. By shifting the inner tube, an annular gap, through which a propellant gas flows, can be adjusted. By adjusting the annular gap, the amount of air supplied can be controlled and thus the particle flow can be adjusted.
  • the system described does not allow the production of absorber cores of different widths without the replacement of injector components or of the entire injector. In particular, it is not possible to adapt the impact surfaces of the superabsorbent powder.
  • the object of the present invention is to provide an injector with which a granular solid, in particular a superabsorbent powder, for the production of absorber cores can be fed into a mixing chamber, in which the impact surface of the superabsorbent powder to the useful surface or to the geometry of the Absorber core can be adjusted.
  • an injector for adding a granular solid in a mixing chamber comprising a central tube for adding the granular solid, an adding device for adding a propellant gas surrounding the central tube, wherein the central tube and the adding device enclosing the central tube at the end of the central tube forming an annular gap, and a mixing section with a constant cross-section, which adjoins the annular gap, and a pipe section with outlet opening following the mixing section, the pipe section with outlet opening a cross-sectional change from a circular inlet cross-section to a non-circular outlet cross-section of the outlet opening and is rotatable about a central axis.
  • the injector according to the invention is used in particular for adding superabsorbent powder into a mixing chamber for the production of hygiene products, for example diapers or sanitary napkins.
  • the superabsorbent powder is sprayed together with fibers, such as cotton fibers or synthetic fibers in a mixing chamber, where mixed with the fibers and applied to a carrier layer.
  • the carrier layer is usually guided over a carrier, which is responsible for the formation of the absorber cores Has depressions. A vacuum is applied to the inside of the carrier so that the carrier material is sucked onto the carrier.
  • the outlet cross section of the tube section with outlet opening is oval or quadrangular, for example rectangular or square.
  • a different width is achieved by the length of one side of the square or by a 45 ° diagonal rotation.
  • the outlet cross-section of the pipe section with outlet opening is rectangular.
  • the ratio of long side to short side with a rectangular outlet cross section of the tube section with outlet opening is preferably in the range of 1 to 1 to 10 to 1, more preferably in the range of 1 to 1 to 8 to 1, in particular in the range of 1 1 to 6 to 1. If the exit cross section has the shape of an ellipse, the ratio of the long half axis to the short half axis is preferably in the range of 1.1 to 1 to 10 to 1.
  • the ratio of long side to short side or long half axis to short half axis is particularly dependent on the products to be produced with the injector.
  • the central tube is axially displaceable to adjust the width of the annular gap through which the propellant gas is added. If the volume flow of the propellant gas remains the same, the speed is reduced when the annular gap is increased and the speed is increased when the annular gap is reduced. This allows adjustment of the amount of particulate material added via the central tube. For example, at a higher velocity of the propellant, more powder is entrained than at a lower velocity.
  • the central tube In order to allow the finest possible adjustment of the annular gap, it is advantageous to mount the central tube with a thread in the injector housing and to adjust the width of the annular gap further penetrate the central tube in the thread or unscrew from the thread.
  • the width of the annular gap When screwing in the central Tube in the thread, the width of the annular gap is reduced and when unscrewing the width of the annular gap is increased.
  • the pitch of the thread can be realized in this way a very fine adjustment of the annular gap.
  • the diameter of the propellant gas adding device enclosing the central tube is preferable for the diameter of the propellant gas adding device enclosing the central tube to decrease towards the annular gap.
  • the annular gap is aligned axially to the main axis of the central tube. This also allows an increase in diameter from the central tube to the mixing section, which adjoins the central tube avoid.
  • the diameter of the central tube and mixing section is preferably the same.
  • a further effect of the diameter decrease of the propellant gas adding device enclosing the central tube is that the propellant gas receives an additional velocity component in the radial direction and therefore flows along with addition not only at the outer edge of the central tube, but also to the axis of the central tube executed.
  • the mixing section As a result, a uniform mixing of propellant gas and granular solid is achieved and achieved a uniform transport of the granular solid with the aid of the propellant gas.
  • the mixing section As an alternative to a design of the same diameter of central pipe and mixing section, it is also possible for the mixing section to have, for example, a slightly larger diameter than the central pipe or a slightly smaller diameter than the central pipe.
  • the annular gap should in any case be designed such that the added propellant gas has a velocity component towards the central axis of the central tube. Based on the diameter of the mixing section compared to the diameter of the central tube, the speed at which the propellant-enriched granular solid is transported can be determined.
  • the velocity is increased; as soon as the diameter of the mixing zone is greater than the diameter of the central tube, the mixture of propellant gas and granular solid has a lower velocity than if the diameter is the same ,
  • the diameter of the central tube and the diameter of the mixing section are equal. If the diameter of the mixing section is to be greater than the diameter of the central tube, it is further preferred that first the diameter of the adding device enclosing the central tube decreases towards the annular gap until it equals the diameter of the central tube and at the first annular gap Diffuser connects. In the first diffuser, the diameter is increased and then the mixing section with a constant cross section adjoins the first diffuser.
  • the diameter of the mixing section is in this case as large as the outlet cross section of the first diffuser.
  • the propellant gas used is preferably one that is inert to the granular solid used.
  • Suitable propellant gases are, for example, nitrogen or air.
  • the propellant is compressed air.
  • the adding device for adding the propellant gas is connected to a compressed air reservoir.
  • the pressure of the compressed gas is preferably kept constant.
  • the injector according to the invention is particularly preferably used for adding superabsorber powder into a mixing space for the production of hygiene products, for example diapers or sanitary napkins. To produce the hygiene products, the superabsorbent powder is usually added with the aid of the injector, and a fibrous material is added with the aid of a second injector.
  • the fibrous material and the superabsorbent powder are mixed in a mixing space and introduced into a suitable mold to produce an absorber core. Typically, this is a negative pressure connected to the mold, so that the mixture of fibrous material and superabsorbent powder is sucked into the mold.
  • FIG. 1 shows a nozzle for adding a granular solid with an axially displaceable central tube and an adjoining mixing section
  • FIG. 2 shows a three-dimensional representation of the injector according to the invention with a rotatable tube section with outlet opening
  • FIG. 1 shows a nozzle for adding a granular solid with an axially displaceable central tube and a mixing section.
  • a mixing nozzle 1 is part of an injector for adding a granular solid into a mixing space.
  • the mixing nozzle 1 comprises a central tube 3, through which a granular solid is supplied.
  • the central tube 3 is enclosed by an adding device 5 for adding a propellant gas.
  • the outer boundary of the adding device 5 forms an injector 7.
  • the central tube 3 and the central tube 3 enclosing the adding device 5 form an annular gap 9.
  • the propellant gas added via the adding device 5 flows through the annular gap 9 into a mixing section 1.
  • the propellant gas flowing through the annular gap 9 into the mixing section 11 draws granular solid from the central tube 3, which is supplied in this way.
  • the adding device 5 is designed so that its diameter decreases towards the annular gap 9.
  • the injector housing 7, which encloses the adding device 5, has a diameter constriction 13.
  • the diameter decreases in the diameter constriction 13 continuously in the axial direction.
  • the diameter corresponds to the diameter of the central tube 3.
  • the propellant gas added through the annular gap 9 undergoes a velocity component in the radial direction. This allows a uniform mixing of propellant and granular solid. There is not only a flow of the propellant along the wall of the mixing section 1 1.
  • the central tube 3 is axially displaceable. Due to the axial displaceability of the central tube 3, it is possible to adjust the width of the annular gap 9. This allows adjustment of the speed with which the propellant gas is added through the annular gap 9. By adjusting the annular gap 9, for example, pressure fluctuations of the propellant gas can be compensated. Alternatively, it is also possible to modify the speed by adjusting the annular gap 9 and to regulate the amount of added granular solid on the basis of the speed.
  • the adding device 5 which surrounds the central tube 3 as an annular channel, is connected to a connection 17.
  • the propellant gas is supplied.
  • the connection 17 is connected, for example, to a compressed air line.
  • the propellant gas flows into the adding device 5.
  • the annular design of the adding device 5 distributes the propellant gas evenly around the central tube 3 and then flows uniformly through the annular gap 9 into the mixing section 11.
  • the mixing section 1 1 is provided with a flange 19.
  • FIG. 2 shows an injector designed in accordance with the invention for adding a granular solid to a mixing chamber with a rotatable tube section with an outlet opening.
  • An injector 21 comprises, in addition to the mixing nozzle 1, a granular solid addition device 23.
  • the adding device 23 comprises, for example, a hopper 25 through which the granular solid is supplied.
  • the adding device 23 need not necessarily include a hopper 25. It is also possible, for example, to connect the injector 21 directly to a supply for the granular solid and to add the granular solid, for example through a sluice, for example a rotary valve. It is also possible, for example, to provide a large hopper containing a supply of granular solid.
  • the mixing nozzle 1 with the mixing section 1 1 connects.
  • a first diffuser 27 is connected to the mixing section 11, followed by a second mixing section 29 with a larger diameter.
  • Adjoining the second mixing section 29 is a pipe section 31 with an outlet opening, which has a cross-sectional change.
  • the cross section of the pipe section 31 with outlet opening changes from a circular inlet cross section to a rectangular outlet cross section.
  • the pipe section 31 with the outlet opening is rotatable about the central axis of the injector 1. This is shown here by an arrow 35.
  • the pipe section 31 with outlet opening is shown in a first position in a solid line and in a second position, which is rotated to the first position by 90 °, with a dashed line.
  • the injector 21, as shown in Figure 2 is particularly suitable for the addition of superabsorbent powder for the production of hygiene products.
  • the pipe section 31 with outlet opening has in each case a circular inlet cross section 37 and a quadrangular outlet cross section 39.
  • the pipe section 31 with outlet opening has the flange 19 with which the pipe section 31 with outlet opening is mounted on the second mixing section 29.
  • the pipe sections 31 with outlet opening illustrated in FIGS. 3 to 5 differ with respect to the geometry of the outlet cross section 39.
  • the outlet cross section is in the form of a rectangle with a long side 41 and a short side 43. where the ratio of long side 41 to short side 43 is approximately 6 to 1.
  • the ratio of long side 41 to short side 43 is approximately 2 to 1 in the embodiment shown in FIG. 4 and approximately 1 to 1 in the embodiment illustrated in FIG. 5, that is to say FIG Cross section is almost square.
  • the nozzles can each be used product-specifically.
  • a long side 41 as long as possible can be selected, even if very broad products are to be produced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Accessories For Mixers (AREA)
  • Nozzles (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

L'invention concerne un injecteur (21) permettant d'introduire un solide granulaire dans une chambre de mélange, comprenant un tube central (3) destiné à l'introduction dudit solide granulaire, un dispositif d'introduction (5) lequel entoure le tube central (3) et lequel permet d'introduire un gaz d'entraînement, le tube central (3) et le dispositif d'introduction (5) lequel entoure le tube central (3) formant une fente annulaire (9) à l'extrémité du tube central (3), ainsi qu'une trajectoire de mélange (11) ayant une section constante et constituant la prolongation de la fente annulaire (9), et une partie de tube (31) laquelle est pourvue d'une sortie et laquelle constitue la prolongation de la trajectoire de mélange (11). La partie de tube (31) pourvue d'une sortie présente une section laquelle est modifiée a manière à passer d'une section d'entrée circulaire à une section de sortie non-circulaire et peut subir une rotation autour d'un axe central.
EP12791136.0A 2011-11-16 2012-11-15 Injecteur pour un solide granulaire Withdrawn EP2780116A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12791136.0A EP2780116A1 (fr) 2011-11-16 2012-11-15 Injecteur pour un solide granulaire

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11189340 2011-11-16
PCT/EP2012/072717 WO2013072410A1 (fr) 2011-11-16 2012-11-15 Injecteur pour un solide granulaire
EP12791136.0A EP2780116A1 (fr) 2011-11-16 2012-11-15 Injecteur pour un solide granulaire

Publications (1)

Publication Number Publication Date
EP2780116A1 true EP2780116A1 (fr) 2014-09-24

Family

ID=47226134

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12791136.0A Withdrawn EP2780116A1 (fr) 2011-11-16 2012-11-15 Injecteur pour un solide granulaire

Country Status (5)

Country Link
US (1) US20130142007A1 (fr)
EP (1) EP2780116A1 (fr)
JP (1) JP2015504359A (fr)
CN (1) CN104010731A (fr)
WO (1) WO2013072410A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107835903B (zh) * 2015-07-15 2020-10-13 巴斯夫欧洲公司 喷射器喷嘴和喷射器喷嘴的用途
CN105090678A (zh) * 2015-08-12 2015-11-25 上海交通大学 可实现均匀分布的气固掺混输送装置及其应用
BE1024173B1 (nl) * 2016-04-28 2017-12-05 Soudal Vochtgevoelige producten maken met drukveranderingen
CN112827690B (zh) * 2020-12-31 2021-11-30 广东省科学院新材料研究所 一种喷嘴装置及喷涂设备
CN115253734A (zh) * 2021-04-30 2022-11-01 国家能源投资集团有限责任公司 气固混合器及煤气化设备
CN115283369A (zh) * 2022-09-06 2022-11-04 林峡 一种二氧化碳状态控制系统及方法

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US2433463A (en) * 1944-10-05 1947-12-30 Sprayo Flake Company Spray gun and method of spraying
DE922039C (de) * 1950-10-05 1955-01-07 Richard Antretter Verstellbare Duese zum Vernebeln von fluessigen, breiigen oder pulverfoermigen Stoffen
NL133667C (fr) * 1961-11-15
BE764407A (fr) * 1971-03-17 1971-08-16 Four Industriel Belge Dispositif pour le dosage d'un melange de deux gaz.
US4075296A (en) * 1977-01-25 1978-02-21 Orsini Ronald J Idle speed needle screw for carburetors
US4186772A (en) * 1977-05-31 1980-02-05 Handleman Avrom Ringle Eductor-mixer system
US4210166A (en) * 1977-09-14 1980-07-01 Munie Julius C Mixing apparatus
GB2198479A (en) 1986-12-11 1988-06-15 Westinghouse Brake & Signal Ejecting granular or particulate material
US5171090A (en) * 1990-04-30 1992-12-15 Wiemers Reginald A Device and method for dispensing a substance in a liquid
US6802638B2 (en) * 2001-10-26 2004-10-12 Thomas E. Allen Automatically adjusting annular jet mixer
US7029165B2 (en) * 2001-10-26 2006-04-18 Allen Thomas E Automatically adjusting annular jet mixer
US20100048393A1 (en) * 2006-12-05 2010-02-25 Basf Se Solid Particle Controlled Dispersing Nozzle and Process
EP2222414A1 (fr) 2007-12-05 2010-09-01 Innovent, An Unincorporated Division Of Standex International Corporation Procédé et appareil d'application de matières particulaires
JP2012502784A (ja) 2008-09-16 2012-02-02 ビーエーエスエフ ソシエタス・ヨーロピア 調節可能な固体粒子提供システム
US7784999B1 (en) * 2009-07-01 2010-08-31 Vortex Systems (International) Ci Eductor apparatus with lobes for optimizing flow patterns

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Also Published As

Publication number Publication date
WO2013072410A1 (fr) 2013-05-23
US20130142007A1 (en) 2013-06-06
JP2015504359A (ja) 2015-02-12
CN104010731A (zh) 2014-08-27

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