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WO2001051275A1 - A method of processing a web material for packaging pourable food products - Google Patents

A method of processing a web material for packaging pourable food products Download PDF

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Publication number
WO2001051275A1
WO2001051275A1 PCT/EP2000/013298 EP0013298W WO0151275A1 WO 2001051275 A1 WO2001051275 A1 WO 2001051275A1 EP 0013298 W EP0013298 W EP 0013298W WO 0151275 A1 WO0151275 A1 WO 0151275A1
Authority
WO
WIPO (PCT)
Prior art keywords
web material
processing
register
web
laser
Prior art date
Application number
PCT/EP2000/013298
Other languages
French (fr)
Inventor
Jonas Hakansson
Original Assignee
Tetra Laval Holdings & 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 & Finance Sa filed Critical Tetra Laval Holdings & Finance Sa
Priority to AU2001225122A priority Critical patent/AU2001225122A1/en
Publication of WO2001051275A1 publication Critical patent/WO2001051275A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/74—Auxiliary operations
    • B31B50/88—Printing; Embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/006—Controlling; Regulating; Measuring; Improving safety

Definitions

  • the present invention relates to a method of processing a web material for packaging pourable food products.
  • pourable food products such as fruit juice, pasteurized or UHT (ultra-high-temperature processed) milk, wine, tomato sauce, etc.
  • packages made of sterilized packaging material are sold in packages made of sterilized packaging material.
  • a typical example of such a package is the parallelepipedal package for liquid or pourable food products known as Tetra Brik Aseptic (registered trademark) , which is formed by folding and sealing a laminated web packaging material .
  • the laminated packaging material comprises layers of fibrous material, e.g. paper, covered on both sides with thermoplastic material, e.g. polyethylene.
  • the side of the packaging material eventually contacting the food product in the package also has a layer of barrier material, such as an aluminium sheet, which in turn is covered with a layer of thermoplastic material .
  • barrier material such as an aluminium sheet
  • thermoplastic material such packages are produced on fully automatic packaging machines, in which a continuous tube is formed from the web packaging material .
  • the web packaging material is loaded into the packaging machine in the form of a reel, from which it continuously unwinds and is fed to a sterilizing unit and then to a forming unit where it is longitudinally folded and sealed to form a tube.
  • the tube is then filled with the sterilized or sterile-processed food product, is sealed by pairs of jaws and then cut at equally spaced transverse bands to form pillow packs, which are subsequently folded mechanically to form the finished, e.g. parallelepipedal, packages.
  • the web packaging material is produced in converting plants where a paperboard or a pre-laminated paperboard, typically including a paper layer covered on one side at least with one layer of thermoplastic material and possibly with the barrier layer and a further layer of thermoplastic material, is subjected to a plurality of successive processing operations such as: printing a repeated design pattern on one side covered with a thermoplastic layer, which is usually made in at least four successive print units, e.g. one unit for printing each colour; creasing, i.e. forming weakened lines along which the material is folded in the packaging machine to form packages; auxiliary mechanical or laser operations such as perforation or cutting; and lamination, i.e. forming a further thermoplastic layer on the printed side.
  • register indexes In order to assure that all discrete operations both at the converting plant and in the packaging machine are in register with one another, i.e. made at correct relative positions on the web, register indexes must be provided on the web.
  • this problem is solved by printing a register mark and a register code on the web at the first print unit.
  • the register mark is used in the successive steps of the converting process to determine the actual position of the web in order to perform the successive operations, such as printing the remaining colours, creasing, and laser- processing, mechanical perforating, hole punching, etc., if any.
  • the register code is used in the packaging machine in order to control the feed of the tube of packaging material and the forming operations thereon.
  • a scope of the present invention is to provide a method of processing a web material for packaging food products which allows the overall errors due to the tolerance chain for functionally relevant dimensions to be reduced. This scope is achieved by a method according to claim 1.
  • Figure 1 is a scheme of a converting plant for performing the method of the present invention.
  • Figure 2 is a partial plan view of a web packaging material produced in accordance with the present invention.
  • numeral 1 indicates as a whole a converting plant for producing reels 2 of web packaging material 3 to be used in a food product packaging machine (not shown) .
  • Plant 1 essentially includes an unwinder 4, in which reels 5 of raw web material are loaded, a plurality of processing stations 6, 7, 8 described hereunder in detail, and a winder 9 where reels 2 of finished web packaging material 3 are formed.
  • the first processing station is a laser station 6 including a laser head 10 which is stationary and mirrors or lenses are moved e.g., by servo-motors, in order to deflect the laser beam.
  • the laser head may be carried and moved by a controllable, high-speed positioning unit 11 such as a robot or the like, so as to produce a register mark 14 on web packaging material 3 (figure 2) , which is used to determine the actual position of the web in the successive processing stations 7, 8.
  • Register mark 14 is repeated along web packaging material 3 at a pitch corresponding to the web length which is necessary to manufacture a package.
  • laser station 6 At least a further structure- modifying laser processing operation is performed, such as a perforation 15. According to a preferred embodiment of the present invention, laser station 6 also produces a register bar code 16 on web packaging material 3, which is to be used in a packaging machine (not shown) for in-register forming operations.
  • a control unit 17 controls laser station 6, and in particular the motion of positioning unit 11 as a function of web speed and laser beam emission by laser head 10, as well as all the other processing stations of plant 1, as described hereunder.
  • the next processing station is a print station 7 including a plurality of print units 7a, 7b, 7c, 7d, per se known, each of which prints a respective colour of a repeated design pattern 18.
  • the position of web packaging material 3 at print station 7 is detected by a sensor 19 which reads register marks 14; web feed at print units 7a, 7b, 7c, 7d and therefore the register of the different colours successively printed, is controlled by control unit 17 in response to sensor 19.
  • register bar code 16 on web packaging material 3 is not produced at laser station 6, then it may be printed at one of prints unit 7a, 7b, 7c, 7d.
  • the following processing station is e.g., a creasing station 8 , wherein web packaging material 3 is fed between two creasing rollers 20, 21 having complementary crease profiles 22, 23 (i.e. projecting ribs on one roller and grooves on the other) which locally delaminate web packaging material 3 along predetermined lines 24 which define a crease pattern on web packaging material 3.
  • the position of web packaging material 3 at crease station 8 is detected by a sensor 25 which reads register marks 14 ; web feed at crease station 8 , and therefore the register of the crease pattern 24, is controlled by control unit 17 in response to sensor 25.
  • Plant 1 may include one or more further processing units, e.g., a laminator (not shown) for producing a thermoplastic layer on the printed side and possibly on the opposite side of web material 3, and also for applying a barrier layer, where present, such as an aluminium foil layer.
  • a laminator for producing a thermoplastic layer on the printed side and possibly on the opposite side of web material 3, and also for applying a barrier layer, where present, such as an aluminium foil layer.
  • the method of processing web packaging material 3 performed by plant 1 includes the steps of: laser processing web packaging material 3 in order to create register mark 14, as well as to perform at least one material structure-modifying operation, and conveniently also to create register code 16; printing a design 18 by successive single-colour print operations in register with register mark 14; and creating a crease pattern 24 in register with register mark 14.
  • register code 16 is made in the first operation, then also all operations carried out in the packaging machine will be free from error sum effects due to tolerance chains .
  • the additional processing operation performed in laser processing station 6 may be of any kind; the number of print units may vary depending on the number of print colours; any further operations may be performed before or after creasing.

Landscapes

  • Making Paper Articles (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)

Abstract

A method of processing a web material (3) for packaging food products, including the step of laser-processing the web material (3) in order to create a register mark (14) and to perform one or more additional material structure-modifying operations such as a perforation (15) or hole; the step of printing a design (18) by successive single-colour print operations in register with the register mark (14); and the step of creating a crease pattern (24) in register with the register mark (14).

Description

A METHOD OF PROCESSING A WEB MATERIAL FOR PACKAGING POURABLE FOOD PRODUCTS.
TECHNICAL FIELD The present invention relates to a method of processing a web material for packaging pourable food products. BACKGROUND ART
Many pourable food products, such as fruit juice, pasteurized or UHT (ultra-high-temperature processed) milk, wine, tomato sauce, etc., are sold in packages made of sterilized packaging material. A typical example of such a package is the parallelepipedal package for liquid or pourable food products known as Tetra Brik Aseptic (registered trademark) , which is formed by folding and sealing a laminated web packaging material . The laminated packaging material comprises layers of fibrous material, e.g. paper, covered on both sides with thermoplastic material, e.g. polyethylene. In the case of aseptic packages, the side of the packaging material eventually contacting the food product in the package also has a layer of barrier material, such as an aluminium sheet, which in turn is covered with a layer of thermoplastic material . As is known, such packages are produced on fully automatic packaging machines, in which a continuous tube is formed from the web packaging material .
The web packaging material is loaded into the packaging machine in the form of a reel, from which it continuously unwinds and is fed to a sterilizing unit and then to a forming unit where it is longitudinally folded and sealed to form a tube. The tube is then filled with the sterilized or sterile-processed food product, is sealed by pairs of jaws and then cut at equally spaced transverse bands to form pillow packs, which are subsequently folded mechanically to form the finished, e.g. parallelepipedal, packages.
The web packaging material is produced in converting plants where a paperboard or a pre-laminated paperboard, typically including a paper layer covered on one side at least with one layer of thermoplastic material and possibly with the barrier layer and a further layer of thermoplastic material, is subjected to a plurality of successive processing operations such as: printing a repeated design pattern on one side covered with a thermoplastic layer, which is usually made in at least four successive print units, e.g. one unit for printing each colour; creasing, i.e. forming weakened lines along which the material is folded in the packaging machine to form packages; auxiliary mechanical or laser operations such as perforation or cutting; and lamination, i.e. forming a further thermoplastic layer on the printed side.
In order to assure that all discrete operations both at the converting plant and in the packaging machine are in register with one another, i.e. made at correct relative positions on the web, register indexes must be provided on the web.
According to a known processing method, this problem is solved by printing a register mark and a register code on the web at the first print unit. The register mark is used in the successive steps of the converting process to determine the actual position of the web in order to perform the successive operations, such as printing the remaining colours, creasing, and laser- processing, mechanical perforating, hole punching, etc., if any. The register code is used in the packaging machine in order to control the feed of the tube of packaging material and the forming operations thereon.
The use of a printed register mark for all successive operations implies that such operations are performed with a position error, depending on the process tolerances, which is referred to the printed mark. This means that any result of a successive operation (printed design, crease pattern, laser pattern, etc.) may have a positive or negative position error with respect to a theoretical position determined by the printed mark; the absolute value of the error is comprised within a maximum value depending on the process tolerances. In case two successive operations which have a functional impact when forming and filling packages, such as the crease pattern and the laser pattern, happen to by subjected to errors in opposite directions, the tolerance chain may produce a relative error between such operations which is up to the sum of the tolerance widths of each single operation. DISCLOSURE OF INVENTION A scope of the present invention is to provide a method of processing a web material for packaging food products which allows the overall errors due to the tolerance chain for functionally relevant dimensions to be reduced. This scope is achieved by a method according to claim 1.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the present invention is described hereunder, by way of non-limiting example and with reference to the attached drawings, in which:
Figure 1 is a scheme of a converting plant for performing the method of the present invention; and
Figure 2 is a partial plan view of a web packaging material produced in accordance with the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
With reference to Figure 1, numeral 1 indicates as a whole a converting plant for producing reels 2 of web packaging material 3 to be used in a food product packaging machine (not shown) .
Plant 1 essentially includes an unwinder 4, in which reels 5 of raw web material are loaded, a plurality of processing stations 6, 7, 8 described hereunder in detail, and a winder 9 where reels 2 of finished web packaging material 3 are formed.
According to the present invention, the first processing station is a laser station 6 including a laser head 10 which is stationary and mirrors or lenses are moved e.g., by servo-motors, in order to deflect the laser beam. Alternatively, the laser head may be carried and moved by a controllable, high-speed positioning unit 11 such as a robot or the like, so as to produce a register mark 14 on web packaging material 3 (figure 2) , which is used to determine the actual position of the web in the successive processing stations 7, 8. Register mark 14 is repeated along web packaging material 3 at a pitch corresponding to the web length which is necessary to manufacture a package.
In laser station 6, at least a further structure- modifying laser processing operation is performed, such as a perforation 15. According to a preferred embodiment of the present invention, laser station 6 also produces a register bar code 16 on web packaging material 3, which is to be used in a packaging machine (not shown) for in-register forming operations.
A control unit 17 controls laser station 6, and in particular the motion of positioning unit 11 as a function of web speed and laser beam emission by laser head 10, as well as all the other processing stations of plant 1, as described hereunder.
The next processing station is a print station 7 including a plurality of print units 7a, 7b, 7c, 7d, per se known, each of which prints a respective colour of a repeated design pattern 18.
The position of web packaging material 3 at print station 7 is detected by a sensor 19 which reads register marks 14; web feed at print units 7a, 7b, 7c, 7d and therefore the register of the different colours successively printed, is controlled by control unit 17 in response to sensor 19.
If register bar code 16 on web packaging material 3 is not produced at laser station 6, then it may be printed at one of prints unit 7a, 7b, 7c, 7d. The following processing station is e.g., a creasing station 8 , wherein web packaging material 3 is fed between two creasing rollers 20, 21 having complementary crease profiles 22, 23 (i.e. projecting ribs on one roller and grooves on the other) which locally delaminate web packaging material 3 along predetermined lines 24 which define a crease pattern on web packaging material 3. The position of web packaging material 3 at crease station 8 is detected by a sensor 25 which reads register marks 14 ; web feed at crease station 8 , and therefore the register of the crease pattern 24, is controlled by control unit 17 in response to sensor 25.
Plant 1 may include one or more further processing units, e.g., a laminator (not shown) for producing a thermoplastic layer on the printed side and possibly on the opposite side of web material 3, and also for applying a barrier layer, where present, such as an aluminium foil layer.
According to the present invention, the method of processing web packaging material 3 performed by plant 1 includes the steps of: laser processing web packaging material 3 in order to create register mark 14, as well as to perform at least one material structure-modifying operation, and conveniently also to create register code 16; printing a design 18 by successive single-colour print operations in register with register mark 14; and creating a crease pattern 24 in register with register mark 14.
The advantages of the present invention are clear from the foregoing description. In particular, by using a laser head 10 as the first operation for the creation of the register mark 14 as well as for performing other structure-modifying operations such as making holes or perforations (which thus are perfectly in register with the register mark) , and by using the register mark to detect the web position for all subsequent operations, the overall position error between functionally relevant operations, e.g. perforation and creasing, will decrease.
If also register code 16 is made in the first operation, then also all operations carried out in the packaging machine will be free from error sum effects due to tolerance chains .
Clearly, changes may be made to the method described herein without, however, departing from the scope of the present invention as claimed.
In particular, the additional processing operation performed in laser processing station 6 may be of any kind; the number of print units may vary depending on the number of print colours; any further operations may be performed before or after creasing.

Claims

1.- A method of processing a web material (3) for packaging pourable food products, the method including a first step of creating a register mark (14) on said web material (3) , a second step of printing a design (18) by successive print operations, a third step of creating a crease pattern on said web material (3) so as to allow said web material (3) to be folded along predetermined lines (24) in a food packaging machine, and a fourth step of performing at least one further structure- modifying operation on said web material (3) , characterised in that said first and fourth steps are carried out by laser-processing said web material (3) in a laser-processing station (6) , said second and third steps being performed by using said register mark (14) created by laser processing to determine the actual position of said web material (3) .
2.- A process as claimed in claim 1, characterised by including the step of creating a register code (16) for said packaging machine on said web material (3) .
3. - A process as claimed in claim 2 , characterised in that said register code (16) is created in said first step of said method by laser processing.
4.- A process as claimed in claim 2, characterised in that said register code (16) is printed in said second step of said method.
PCT/EP2000/013298 2000-01-14 2000-12-27 A method of processing a web material for packaging pourable food products WO2001051275A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001225122A AU2001225122A1 (en) 2000-01-14 2000-12-27 A method of processing a web material for packaging pourable food products

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0000106-5 2000-01-14
SE0000106A SE520430C2 (en) 2000-01-14 2000-01-14 A process for processing a web material intended for packaging liquid food products

Publications (1)

Publication Number Publication Date
WO2001051275A1 true WO2001051275A1 (en) 2001-07-19

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SE (1) SE520430C2 (en)
WO (1) WO2001051275A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003072439A1 (en) * 2002-02-21 2003-09-04 Stora Enso Baienfurt Gmbh & Co. Kg Method and device for producing packagings
WO2009093936A1 (en) * 2008-01-23 2009-07-30 Tetra Laval Holdings & Finance S.A. Method for controlling the register between a printed pattern and a three-dimensional pattern on a packaging material
WO2014023487A1 (en) * 2012-08-06 2014-02-13 Tetra Laval Holdings & Finance S.A. Improved processing of webs
US9030512B2 (en) 2012-06-08 2015-05-12 Tecnomar Oy Laser process alignment measuring method
WO2017072072A1 (en) * 2015-10-29 2017-05-04 Tetra Laval Holdings & Finance S.A. Arrangement and method for processing a web of packaging material, and a packaging material
DE102023132968A1 (en) * 2023-11-27 2025-05-28 Koenig & Bauer Ag Printing machine with non-impact printing unit and creasing device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4610649A (en) * 1980-10-31 1986-09-09 Plk Papier-Und Kunstoff Werk Linnich Gmbh Method of manufacturing plastic-coated packages to hold liquids
EP0279505A2 (en) * 1987-01-14 1988-08-24 The Wiggins Teape Group Limited Laser apparatus for repetitively marking a moving sheet
EP0527113A1 (en) * 1991-06-12 1993-02-10 Roll Systems, Inc. System and method for manufacturing envelopes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4610649A (en) * 1980-10-31 1986-09-09 Plk Papier-Und Kunstoff Werk Linnich Gmbh Method of manufacturing plastic-coated packages to hold liquids
EP0279505A2 (en) * 1987-01-14 1988-08-24 The Wiggins Teape Group Limited Laser apparatus for repetitively marking a moving sheet
EP0527113A1 (en) * 1991-06-12 1993-02-10 Roll Systems, Inc. System and method for manufacturing envelopes

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003072439A1 (en) * 2002-02-21 2003-09-04 Stora Enso Baienfurt Gmbh & Co. Kg Method and device for producing packagings
WO2009093936A1 (en) * 2008-01-23 2009-07-30 Tetra Laval Holdings & Finance S.A. Method for controlling the register between a printed pattern and a three-dimensional pattern on a packaging material
JP2011517644A (en) * 2008-01-23 2011-06-16 テトラ・ラヴァル・ホールディングス・アンド・ファイナンス・ソシエテ・アノニム A method for controlling registration between a pattern printed on a packaging material and a three-dimensional pattern.
US8334979B2 (en) 2008-01-23 2012-12-18 Tetra Laval Holdings & Finance S.A. Method for controlling the register between a printed pattern and a three-dimensional pattern on a packaging material
RU2479834C2 (en) * 2008-01-23 2013-04-20 Тетра Лаваль Холдингз Энд Файнэнс С.А. Method of checking registration between printed image and three-dimensional structure on packaging material
RU2552906C2 (en) * 2012-06-08 2015-06-10 Текномар Ой Method of measuring laser processing alignment
US9030512B2 (en) 2012-06-08 2015-05-12 Tecnomar Oy Laser process alignment measuring method
CN104520107A (en) * 2012-08-06 2015-04-15 利乐拉瓦尔集团及财务有限公司 Improved processing of webs
WO2014023487A1 (en) * 2012-08-06 2014-02-13 Tetra Laval Holdings & Finance S.A. Improved processing of webs
JP2015534140A (en) * 2012-08-06 2015-11-26 テトラ・ラヴァル・ホールディングス・アンド・ファイナンス・ソシエテ・アノニムＴｅｔｒａ Ｌａｖａｌ Ｈｏｌｄｉｎｇｓ ＆ Ｆｉｎａｎｃｅ Ｓ．Ａ． Improved web processing
US9361550B2 (en) 2012-08-06 2016-06-07 Tetra Laval Holdings & Finance S.A. Processing webs using printed graphic code symbol relating to web features
RU2635077C2 (en) * 2012-08-06 2017-11-08 Тетра Лаваль Холдингз Энд Файнэнс С.А. Advanced processing of sheets
WO2017072072A1 (en) * 2015-10-29 2017-05-04 Tetra Laval Holdings & Finance S.A. Arrangement and method for processing a web of packaging material, and a packaging material
CN108349190A (en) * 2015-10-29 2018-07-31 利乐拉瓦尔集团及财务有限公司 Manufacture the method and apparatus and packaging material of decorated package
CN108925134A (en) * 2015-10-29 2018-11-30 利乐拉瓦尔集团及财务有限公司 Apparatus and method for processing a web of packaging material and packaging material
US20190061301A1 (en) * 2015-10-29 2019-02-28 Tetra Laval Holdings & Finance S.A. Arrangement and method for processing a web of packaging material, and a packaging material
DE102023132968A1 (en) * 2023-11-27 2025-05-28 Koenig & Bauer Ag Printing machine with non-impact printing unit and creasing device
WO2025113827A1 (en) 2023-11-27 2025-06-05 Koenig & Bauer Ag Printing machine with non-impact printing unit and scoring device

Also Published As

Publication number Publication date
SE0000106L (en) 2001-07-15
AU2001225122A1 (en) 2001-07-24
SE0000106D0 (en) 2000-01-14
SE520430C2 (en) 2003-07-08

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