EP1759998A1 - Verpackungsverfahren und -maschine zum Herstellen versiegelter Packungen mit giessfähigen Lebensmitteln - Google Patents

Verpackungsverfahren und -maschine zum Herstellen versiegelter Packungen mit giessfähigen Lebensmitteln Download PDF

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Publication number
EP1759998A1
EP1759998A1 EP05425608A EP05425608A EP1759998A1 EP 1759998 A1 EP1759998 A1 EP 1759998A1 EP 05425608 A EP05425608 A EP 05425608A EP 05425608 A EP05425608 A EP 05425608A EP 1759998 A1 EP1759998 A1 EP 1759998A1
Authority
EP
European Patent Office
Prior art keywords
packaging material
web
labels
packages
forming
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Withdrawn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
EP05425608A
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English (en)
French (fr)
Inventor
Claudio Casarini
Stefan Geijer
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.)
Tetra Laval Holdings and Finance SA
Original Assignee
Tetra Laval Holdings and Finance SA
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 Tetra Laval Holdings and Finance SA filed Critical Tetra Laval Holdings and Finance SA
Priority to EP05425608A priority Critical patent/EP1759998A1/de
Publication of EP1759998A1 publication Critical patent/EP1759998A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B55/00—Preserving, protecting or purifying packages or package contents in association with packaging
    • B65B55/02—Sterilising, e.g. of complete packages
    • B65B55/04—Sterilising wrappers or receptacles prior to, or during, packaging
    • B65B55/10—Sterilising wrappers or receptacles prior to, or during, packaging by liquids or gases
    • B65B55/103—Sterilising flat or tubular webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/2056—Machines for packages of special type or form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2203/00—Decoration means, markings, information elements, contents indicators
    • B65D2203/02—Labels

Definitions

  • the present invention relates to a method of producing sealed packages of pourable food products, and to a packaging machine implementing such a method.
  • pourable food products such as fruit juice, pasteurized or UHT (ultra-high-temperature treated) milk, wine, tomato sauce, etc.
  • UHT ultra-high-temperature treated milk
  • wine tomato sauce
  • etc. are sold in packages made of sterilized packaging material.
  • Tetra Brik Aseptic registered trademark
  • a typical example of this type of package is the parallelepiped-shaped package for liquid or pourable food products known as Tetra Brik Aseptic (registered trademark), which is made by folding and sealing laminated strip packaging material.
  • the packaging material normally has a multilayer structure comprising a layer of fibrous material, e.g. paper, covered on both sides with layers of heat-seal plastic material, e.g. polyethylene.
  • the packaging material comprises a layer of barrier material, e.g. defined by a sheet of aluminium foil or EVOH, which is superimposed on a layer of heat-seal plastic material, and is in turn covered with another layer of heat-seal plastic material eventually forming the inner face of the package contacting the food product.
  • barrier material e.g. defined by a sheet of aluminium foil or EVOH
  • the strip packaging material is normally supplied pre-printed with a series of equally spaced graphics or decorations on the portions eventually defining the outer surface of the packages.
  • the decorations normally comprise both images and writing, e.g. indicating the brand and providing consumer information about the product and the manufacturer.
  • packages of this sort are produced on fully automatic packaging machines, on which a continuous tube is formed from the web-fed packaging material. More specifically, the web of packaging material is unwound off a reel and fed through an aseptic chamber on the packaging machine, where it is sterilized, e.g. by applying a sterilizing agent such as hydrogen peroxide, which is subsequently evaporated by heating and/or subjecting the packaging material to radiation of appropriate wavelength and intensity; and the web so sterilized is maintained in a closed, sterile environment, and is folded into a cylinder and sealed longitudinally to form a continuous tube in known manner.
  • a sterilizing agent such as hydrogen peroxide
  • the tube of packaging material is fed in a vertical direction, is filled with the sterilized or sterile-processed food product, and is fed through a sealing device to form the individual packages. More specifically, in the sealing device, the tube is sealed along a number of equally spaced cross sections to form a continuous strip of pillow packs connected to one another by respective transverse sealing bands, i.e. extending perpendicularly to the traveling direction of the tube.
  • the pillow packs are separated by cutting the relative transverse sealing bands, and are then conveyed to a folding station where they are folded mechanically to form respective finished, parallelepiped-shaped packages.
  • labels are applied to complete the external configuration of the package.
  • the labels may contain specific additional consumer information, such as recipes, sales promotion details, or the use of particular ingredients or flavourings.
  • labels are applied to specific outer surface areas of the package with no printing, so that, using labels with different graphics, packages with different external configurations can be obtained as required.
  • labels are used to cover bar codes of packages sold in groups as opposed to singly.
  • the labels are normally applied by specific labelling devices as the packages are fed in an upright position along a conveyor belt.
  • covering the bar codes with labels may prove extremely difficult, on account of the areas in which the bar codes are located normally being difficult to reach in the travelling position of the packages on the conveyor belt.
  • the present invention also relates to a packaging machine for producing sealed packages of pourable food products, as claimed in Claim 8.
  • Number 1 in Figure 1 indicates as a whole a pourable food product packaging machine for continuously producing aseptic sealed packages of a pourable food product (some examples of which are shown in Figures 2, 4, 6, 8, 10 and commented on below) from a web of packaging material 2 (hereinafter referred to simply as "web 2").
  • Machine 1 comprises a sterilizing unit 3 for sterilizing web 2, and to which web 2 is fed off a reel (not shown) along a substantially horizontal path P 1 ; and a form-and-seal unit 4, in which web 2 is folded, sealed, and filled with the pourable food product to form the finished packages.
  • Sterilizing unit 3 substantially comprises a U-shaped sterilizing bath 5 containing a liquid sterilizing agent, e.g. a solution of 30% hydrogen peroxide (H 2 O 2 ) and water, up to a predetermined level.
  • Bath 5 is defined by a vertical input branch 6 and a vertical output branch 7, which have respective top openings 8 and 9 respectively defining the inlet and outlet by which web 2 is fed in and out of bath 5.
  • Branches 6 and 7 are connected at the bottom by a bottom portion 11 of bath 5 housing a horizontal-axis guide roller 12.
  • web 2 therefore describes a U-shaped path P 2 , the length of which is defined, as a function of the travelling speed of web 2, to ensure the packaging material remains long enough inside the sterilizing agent (e.g. 7 seconds).
  • Bath 5 forms part of a known peroxide control circuit (not shown), and is maintained, in use, at a controlled temperature, e.g. of about 70°C.
  • Machine 1 also comprises an aseptic chamber 15 having an inlet coincident with outlet 9 of bath 5.
  • Aseptic chamber 15 is defined by a top portion 16 housing known drying means 17 for removing residual sterilizing agent from web 2, and by a vertical bottom portion or tower 18 parallel to bath 5 and in which web 2 is folded longitudinally into a cylinder and sealed to form a continuous cylindrical tube 20.
  • Drying means 17 are shown only partly in Figure 1, by not being necessary to a clear understanding of the present invention, and, as shown, substantially comprise two idle drying rollers 21, which are covered with relatively soft material, have respective horizontal axes parallel to each other, are located close to the inlet of aseptic chamber 15, on opposite sides of web 2, and exert pressure on respective opposite faces of web 2 to squeeze the drops of sterilizing agent out and back into bath 5.
  • Drying means 17 also comprise known air knives (not shown) located downstream from rollers 21 (in the travelling direction of web 2), i.e. over rollers 21, to direct hot-air jets onto web 2.
  • Aseptic chamber 15 is maintained at a slightly higher pressure than the outside atmosphere, so that any leakage from the seals is outwards and not inwards of the chamber.
  • the overpressure must be limited - in the order of a few mbars - to prevent excessive leakage of air contaminated by the sterilizing agent, which would pollute the working environment.
  • Top portion 16 and tower 18 of aseptic chamber 15 also house direction rollers and guide members, indicated generically by 23, for folding web 2 into a cylinder and forming tube 20 of packaging material.
  • tube 20 practically forms an extension of aseptic chamber 15, and is filled continuously downwards with the pourable food product by a feed conduit 24.
  • tube 20 is fed along a vertical path P 3 parallel to branches 6 and 7 of bath 5, and through form-and-seal unit 4 to produce the individual packages.
  • form-and-seal unit 4 - known and only shown schematically - comprises two or more pairs of jaws 25, which act cyclically on tube 20 to grip and seal it along equally spaced cross sections.
  • the result of the above operation is a continuous strip (shown only partly) of pillow packs 26 joined to one another by transverse sealing bands 27, and which are subsequently separated by cutting sealing bands 27 in known manner not shown, and are folded mechanically by a downstream unit - also known and not shown - to form the finished packages.
  • Machine 1 advantageously also comprises a device 30 operating upstream from sterilizing unit 3 and form-and-seal unit 4 to apply labels 31 directly onto web 2.
  • labels 31 are preferably adhesive, and are supplied on a continuous strip 32, which is unwound off a reel 33, is fed between a number of direction rollers 34, and is rewound, without labels 31, onto a further reel 35.
  • strip 32 of labels 31 is fed by rollers 34 along a path P 4 terminating, close to web 2, with a portion 36 incident with respect to web 2.
  • rollers 34 diverts strip 32 roughly 180° towards reel 35, and the sharp change in direction is exploited to detach labels 31 from strip 32 and attach labels 31 to web 2.
  • the adhesive used to fix labels 31 to web 2 must be resistant to the sterilization process through bath 5 containing hydrogen peroxide, and to the follow-up hot-air-jet drying process.
  • web 2 as it travels along path P 1 and before reaching sterilizing unit 3 and form-and-seal unit 4, is fed past device 30 for applying labels 31.
  • Labels 31 are fixed to predetermined areas of the portions of web 2 eventually forming the individual packages.
  • Numbers 10, 10', 10'', 10''', 10'''' in Figures 2, 4, 6, 8, 10 indicate as a whole examples of known packages producible on machine 1.
  • Numbers 100, 100', 100'', 100''', 100''', 100'''' in Figures 3, 5, 7, 9, 11 indicate the portions of web 2 from which packages 10, 10', 10'', 10''', 10'''' are formed respectively.
  • portions 100, 100', 100'', 100''' and 100''''', A, A', A'', A''', A'''' indicate respective crease patterns, i.e. fold lines along which web 2 is folded as it is fed through form-and-seal unit 4, and B, B', B'', B''', B'''' indicate the areas in which labels 31 of various shapes and sizes are to be applied.
  • any area of web portions 100, 100', 100'', 100''', 100'''', 100''' eventually forming respective finished packages 10, 10', 10'', 10''', 10'''' when formed and sealed is easily accessible and, above all, with the same positioning precision.
  • the surface of web 2 to which labels 31 are applied is flat and even, unlike the panels of a normal finished package, the planes of which are affected by the pourable food product inside the package.
  • Device 30 may easily be used to apply a number of labels 31 simultaneously to the same portion 100, 100', 100'', 100''', 100'''' of web 2, thus simplifying machine 1 as compared with known packaging machines.
  • Correct positioning of labels 31 on web 2 may advantageously be controlled, for example, using a special graphic or contrasting colour in areas B, B', B'', B''', B'''' with no printing, so that, once labels 31 are applied, the graphic is partly visible on the label application side and detectable by a detecting device based, for example, on television cameras or photocells and indicated 40 in Figure 1.
  • detecting device 40 may generate an error signal transmitted to a central control unit (not shown) of machine 1; and the package with the wrongly positioned label 31 may be rejected at the end of the form-and-seal operations.
  • Detecting device 40 may advantageously be located downstream from sterilizing unit 3.
  • correct positioning of labels 31 may also be controlled using as a reference the bar codes printed on web 2 or other references provided on web 2, such as those used to align the printed design on the finished package.
  • sterilizing unit 3 may be a different type, e.g. for irradiating web 2 of packaging material with radiation of appropriate wavelength and intensity.
  • Labels 31 may be heat sealed, as opposed to glued, to web 2 of packaging material, e.g. using known hotplate or induction heat sealing methods used to fix so-called pull-tabs to the strip packaging material, as described and illustrated in Patent Applications EP-B-1065145 and EP-B-149130 .
EP05425608A 2005-08-30 2005-08-30 Verpackungsverfahren und -maschine zum Herstellen versiegelter Packungen mit giessfähigen Lebensmitteln Withdrawn EP1759998A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05425608A EP1759998A1 (de) 2005-08-30 2005-08-30 Verpackungsverfahren und -maschine zum Herstellen versiegelter Packungen mit giessfähigen Lebensmitteln

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05425608A EP1759998A1 (de) 2005-08-30 2005-08-30 Verpackungsverfahren und -maschine zum Herstellen versiegelter Packungen mit giessfähigen Lebensmitteln

Publications (1)

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EP1759998A1 true EP1759998A1 (de) 2007-03-07

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EP05425608A Withdrawn EP1759998A1 (de) 2005-08-30 2005-08-30 Verpackungsverfahren und -maschine zum Herstellen versiegelter Packungen mit giessfähigen Lebensmitteln

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010116519A1 (ja) * 2009-04-10 2010-10-14 オリヒロエンジニアリング株式会社 無菌充填包装機および無菌充填包装方法
CN104859907A (zh) * 2014-02-21 2015-08-26 莫迪维克检测有限公司 具有贴标装置的管袋成形机
WO2015128794A1 (en) 2014-02-28 2015-09-03 G.D S.P.A. Method for checking the position of an adhesive label on a sheet material
EP3081927A1 (de) * 2015-04-17 2016-10-19 Becton Dickinson Rowa Germany GmbH Vorrichtung zum verpacken von einzelnen medikamentenportionen und verfahren zu deren betrieb
US10155603B2 (en) 2015-04-17 2018-12-18 Carefusion Germany 326 Gmbh Apparatus for packaging individual medication doses and method for its operation
IT201900007201A1 (it) * 2019-05-24 2020-11-24 Gd Spa Macchina confezionatrice di prodotti per preparati alimentari versabili
WO2020260190A3 (en) * 2019-06-28 2021-03-11 Tetra Laval Holdings & Finance S.A. A method for removing excess of a sterilization agent from a web of carton-based packaging material and a system thereof
EP3933234A1 (de) * 2020-06-29 2022-01-05 Tetra Laval Holdings & Finance S.A. Ventil zur bereitstellung von luftimpulsen
JP7408459B2 (ja) 2020-03-30 2024-01-05 株式会社フジシール 蓋付き三角パックの製造方法及び蓋付き三角パック

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1002932A (en) * 1963-06-04 1965-09-02 Tetra Pak Ab A device for applying covering wafers, labels or the like to a continuously or intermittently advanced web of material
EP0149130B1 (de) 1983-12-15 1987-06-03 Ab Tetra Pak Verfahren zum Siegeln einer Entleerungsöffnung und Vorrichtung zur Ausübung des Verfahrens
GB2253385A (en) * 1990-03-13 1992-09-09 Osaka Sealing Label Print A packaging machine incorporating a labelling device
US6041575A (en) * 1998-11-03 2000-03-28 Exact Packaging, Inc. Method and apparatus for applying article to interior surface of flexible package
EP1050468A1 (de) * 1999-05-03 2000-11-08 Tetra Laval Holdings & Finance S.A. Einheit zum Sterilisieren eines Materialstreifens in einer Verpackungsmschine für das Verpacken von fliessfähigen Nahrungsmitteln, und Verpackungsmschine mit solcher Einheit
EP1375380A1 (de) * 2002-06-24 2004-01-02 Fuji Machinery Co., Ltd. Vorrichtungen zum Formen, Befüllen und Verschweissen, wiederverschweissbare flexible Verpackungen und Methoden für die Herstellung von wiederverschweissbaren flexiblen Verpackungen
EP1065145B1 (de) 1999-06-30 2004-11-03 Tetra Laval Holdings & Finance SA Verfahren und Vorrichtung zum Befestigen von Aufreisslaschen auf Verpackungsmaterial für flüssige Lebensmittelprodukte

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1002932A (en) * 1963-06-04 1965-09-02 Tetra Pak Ab A device for applying covering wafers, labels or the like to a continuously or intermittently advanced web of material
EP0149130B1 (de) 1983-12-15 1987-06-03 Ab Tetra Pak Verfahren zum Siegeln einer Entleerungsöffnung und Vorrichtung zur Ausübung des Verfahrens
GB2253385A (en) * 1990-03-13 1992-09-09 Osaka Sealing Label Print A packaging machine incorporating a labelling device
US6041575A (en) * 1998-11-03 2000-03-28 Exact Packaging, Inc. Method and apparatus for applying article to interior surface of flexible package
EP1050468A1 (de) * 1999-05-03 2000-11-08 Tetra Laval Holdings & Finance S.A. Einheit zum Sterilisieren eines Materialstreifens in einer Verpackungsmschine für das Verpacken von fliessfähigen Nahrungsmitteln, und Verpackungsmschine mit solcher Einheit
EP1065145B1 (de) 1999-06-30 2004-11-03 Tetra Laval Holdings & Finance SA Verfahren und Vorrichtung zum Befestigen von Aufreisslaschen auf Verpackungsmaterial für flüssige Lebensmittelprodukte
EP1375380A1 (de) * 2002-06-24 2004-01-02 Fuji Machinery Co., Ltd. Vorrichtungen zum Formen, Befüllen und Verschweissen, wiederverschweissbare flexible Verpackungen und Methoden für die Herstellung von wiederverschweissbaren flexiblen Verpackungen

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010116519A1 (ja) * 2009-04-10 2010-10-14 オリヒロエンジニアリング株式会社 無菌充填包装機および無菌充填包装方法
CN102387965A (zh) * 2009-04-10 2012-03-21 织宽工程株式会社 无菌填充包装机和无菌填充包装方法
CN102387965B (zh) * 2009-04-10 2013-07-17 织宽工程株式会社 无菌填充包装机和无菌填充包装方法
US9371146B2 (en) 2009-04-10 2016-06-21 Orihiro Engineering Co., Ltd. Aseptic filling packaging machine and aseptic filling packaging method
CN104859907A (zh) * 2014-02-21 2015-08-26 莫迪维克检测有限公司 具有贴标装置的管袋成形机
EP2910482A1 (de) * 2014-02-21 2015-08-26 MULTIVAC Marking & Inspection GmbH & Co. KG Schlauchbeutelmaschine mit Etikettiervorrichtung
WO2015128794A1 (en) 2014-02-28 2015-09-03 G.D S.P.A. Method for checking the position of an adhesive label on a sheet material
EP3110702B1 (de) * 2014-02-28 2020-06-17 G.D. S.p.A Verfahren zur überprüfung der position eines klebeetiketts auf einem blattförmigen material
US10155603B2 (en) 2015-04-17 2018-12-18 Carefusion Germany 326 Gmbh Apparatus for packaging individual medication doses and method for its operation
US11059616B2 (en) 2015-04-17 2021-07-13 Carefusion Germany 326 Gmbh Apparatus for packaging individual medication doses and method for its operation
WO2016166187A1 (de) * 2015-04-17 2016-10-20 Becton Dickinson Rowa Germany Gmbh Vorrichtung zum verpacken von einzelnen medikamentenportionen und verfahren zu deren betrieb
CN107531352B (zh) * 2015-04-17 2019-10-29 贝克顿迪金森罗瓦德国有限公司 用于包装单份药物剂量的设备和操作方法
EP3081927A1 (de) * 2015-04-17 2016-10-19 Becton Dickinson Rowa Germany GmbH Vorrichtung zum verpacken von einzelnen medikamentenportionen und verfahren zu deren betrieb
CN107531352A (zh) * 2015-04-17 2018-01-02 贝克顿迪金森罗瓦德国有限公司 用于包装单份药物剂量的设备和操作方法
IT201900007201A1 (it) * 2019-05-24 2020-11-24 Gd Spa Macchina confezionatrice di prodotti per preparati alimentari versabili
EP3741690A1 (de) * 2019-05-24 2020-11-25 G.D. S.p.A Verpackungsmaschine für flüssige lebensmittelzubereitungen
WO2020260190A3 (en) * 2019-06-28 2021-03-11 Tetra Laval Holdings & Finance S.A. A method for removing excess of a sterilization agent from a web of carton-based packaging material and a system thereof
EP3756693A3 (de) * 2019-06-28 2021-05-19 Tetra Laval Holdings & Finance S.A. Verfahren zur entfernung von überschüssigem sterilisationsmittel aus einer bahn aus kartonbasiertem verpackungsmaterial und system dafür
CN114051477A (zh) * 2019-06-28 2022-02-15 利乐拉瓦尔集团及财务有限公司 从基于纸盒的包装材料卷材去除过量灭菌剂的方法及其系统
CN114051477B (zh) * 2019-06-28 2023-10-20 利乐拉瓦尔集团及财务有限公司 从基于纸盒的包装材料卷材去除过量灭菌剂的方法及其系统
JP7408459B2 (ja) 2020-03-30 2024-01-05 株式会社フジシール 蓋付き三角パックの製造方法及び蓋付き三角パック
EP3933234A1 (de) * 2020-06-29 2022-01-05 Tetra Laval Holdings & Finance S.A. Ventil zur bereitstellung von luftimpulsen
WO2022002579A1 (en) * 2020-06-29 2022-01-06 Tetra Laval Holdings & Finance S.A. A valve for providing pulses of air

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