WO2006016175A2 - Pliage de materiaux plastiques en feuilles - Google Patents

Pliage de materiaux plastiques en feuilles Download PDF

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Publication number
WO2006016175A2
WO2006016175A2 PCT/GB2005/003172 GB2005003172W WO2006016175A2 WO 2006016175 A2 WO2006016175 A2 WO 2006016175A2 GB 2005003172 W GB2005003172 W GB 2005003172W WO 2006016175 A2 WO2006016175 A2 WO 2006016175A2
Authority
WO
WIPO (PCT)
Prior art keywords
rule
sheet material
plastics
sheet
crease
Prior art date
Application number
PCT/GB2005/003172
Other languages
English (en)
Other versions
WO2006016175A3 (fr
Inventor
Thomas Harney
Robin Arnold Nailer
Original Assignee
Field Group Plc
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 Field Group Plc filed Critical Field Group Plc
Publication of WO2006016175A2 publication Critical patent/WO2006016175A2/fr
Publication of WO2006016175A3 publication Critical patent/WO2006016175A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/08—Making a superficial cut in the surface of the work without removal of material, e.g. scoring, incising
    • B26D3/085—On sheet material
    • 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
    • B31B50/25—Surface scoring
    • B31B50/252—Surface scoring using presses or dies

Definitions

  • the present invention relates to creasing plastic sheet materials and in particular to a process and apparatus for effecting the same. More particularly the invention relates to a method and apparatus which will allow sheet material to be creased to form creases with measurably consistent crease resistance values which facilitates automatic machine erection, lading and filling of product.
  • Paperboard cartons typically comprise a series of crease lines which allow the sheet material to be erected into the finished shape. In traditional paperboard cartons, these fold lines are created using a rule which deforms the sheet material to form the crease line. The creased blank is then erected, either manually or by machine, into the carton. Such methods have not, however, been successfully employed on plastic sheet materials to date. It is more usual in plastic sheet materials to form a hinge line ultrasonically, or by heat creasing. However, these are expensive and complicated procedures.
  • the present invention seeks to provide a simplified method for forming crease lines in sheet plastics material.
  • the present invention provides a method of cold forming a crease line in a sheet plastics material comprising the steps of: a) positioning the sheet material over a planar platen surface; b) forming the crease line by bringing a scoring rule into engagement with the plastic sheet material and deforming the sheet material between the end of the rule and the platen surface, the scoring rule having a main body portion and a pointed tip.
  • the invention also extends to creasing apparatus for creasing a plastics sheet material, comprising a planar platen surface and a scoring rule, which in use is brought into engagement with the plastic sheet material to deform the sheet material between the end of the rule and the platen surface, the rule having a main body portion and a pointed tip portion.
  • the scoring rule is a 2pt scoring rule, having a main body width of 0.7 mm.
  • the tip has an included angle of between 60° and 110°, more preferably between 80° and 105°.
  • Preferred included angles include 84° and 104°.
  • the pointed tip makes it easy to produce a crease having a relatively low crease strength, which means that the plastic sheet may be formed more easily into a desired shape.
  • the tip preferably tapers symmetrically from the main body portion of the rule.
  • the tip at least of the tool has a Rockwell C hardness of over 55, more preferably 60 or more. This assists in reducing wear on the tool and ensures that the crease depth remains constant through a prolonged production run.
  • the plastics material is cut at the same time as it is creased using a cutting rule.
  • This cutting rule cuts completely through the plastics material to the underlying platen surface.
  • the cutting rule and scoring rule are preferably mounted such that the tip of the scoring rule is set back 0.2 mm from the tip of the cutting rule.
  • scoring rule cuts through enough of the plastic material to ensure that the processed material has a weak crease suitable for running on a carton- erecting machine. At the same time it does not give so weak a crease that the folded carton after the gluing step has no gape in it. Gape is an important property of a folded glued carton; it ensures that a carton does not collapse when pulled from a magazine by the feeding arm, but readily assumes a hollow shape.
  • the rule is typically pushed into the plastics sheet to a depth of between 50% and 90% of the sheet thickness, in some cases over 75% of the sheet thickness .
  • the plastics sheet material is 300 to 800 microns thick, more preferably 350 to 650 microns thick, and the thickness of the material is typically reduced to between 100 and 250 microns, more preferably to between 100 and 200 microns, more preferably still to between 100 and 150 microns, in the crease.
  • the crease formed in the sheet material may not extend completely to the edge of the sheet . Indeed in certain embodiments, it is preferred to offset the end of the crease from the edge so as to prevent, or at least reduce the likelihood of, the crease tearing. Offsets in the range 0.5 to 2 mm, e.g. 0.5, 1.0. 1.5 and 2.0 mm, have been used. Larger offsets are used where the crease is in a highly stressed area where tearing is more likely to occur.
  • the plasties material is preferably creased in traditional paperboard creasing machinery. This machinery comprises a platen against which is pressed a die board.
  • the die board mounts cutting blades and creasing rules such that when the board is pressed against the platen, the blades cut through the material in the desired pattern and the creasing rule presses into the material by a predetermined amount to form the creases.
  • the back surface of die board is acted on by a press to effect the cutting and creasing.
  • a force compensation member is applied to the back surface of the die board so that the cutting and creasing force is properly distributed across the board, thereby achieving the desired depth of cut or crease.
  • This member is applied to selected areas of the die board behind the scoring rule.
  • the force compensation member is typically less that 100 microns thick, more typically under 70 microns thick.
  • Typical thicknesses used are 36, 54 and 68 microns.
  • a force compensation member of less than 25 microns, for example 20 microns or less may be used.
  • the force compensation member may be in the form of a tape, such as a non metallised plastics foil material .
  • the material is in the form of a tape.
  • the force compensation material may be applied in a suitable pattern and with suitable thicknesses under the crease locations to achieve the appropriate creasing force distribution.
  • relatively soft plastic material such as polypropylene can be creased very effectively using a process as discussed above.
  • a creased sheet is produced whose crease have a relatively low, and consistent, crease strength, typically in the range 400-900 ⁇ iN. This makes such sheets particularly suitable for use in automatic erection apparatus which requires blanks with relatively low crease strengths to ensure well defined corners and flat panels.
  • the invention extends to a method of erecting, preferably machine erecting, a carton from a plastics sheet material wherein the blank for forming the carton is creased in accordance with the invention.
  • the invention also extends to a plastics sheet creased in accordance with the invention and a carton erected from such a sheet.
  • Figure 1 shows apparatus for creasing plastic sheet material in accordance with the first embodiment of the invention
  • Figure 2 shows, schematically the profile of the crease formed by the apparatus of Figure 1;
  • Figure 3 shows, schematically, apparatus for forming plastic sheet in accordance with the invention;
  • Figure 4 shows a detail of the apparatus of Figure 3;
  • FIG. 5 shows a further detail of the apparatus of Figure 3.
  • creasing apparatus comprises a platen 2 and a steel scoring rule 4.
  • the platen 2 has a planar upper surface 6 while the rule 4 has a main body portion 8 and a sharply pointed tip portion 10.
  • the lower edge of the tip portion 10 runs in a continuous manner along the lower end of the rule 4.
  • the main body- portion 8 of the rule has a width of 0.7 mm and the overall length of the rule 4 is 23.60 mm.
  • the rule 2 is used to form a crease line 12 in a sheet 14 of a plastics material such as polypropylene. Typically the thickness of the plastic sheet 14 is 350 to 650 microns.
  • the scoring rule 4 is pressed downwardly into the sheet material 14.
  • one or more scoring rules 4 are mounted in a die board 16 together with one or more cutting blades 18 which project slightly below the rules 4.
  • the cutting blade has a length of 23.80 mm, meaning that the tip 10 of the scoring rule 4 is set back 0.2 mm from the tip of the cutting blade.
  • a creasing and cutting force is applied to the die board by a press 20.
  • the force with which the rule is applied is chosen so as to give a desired crease strength in the crease 14.
  • the material in the crease is compressed so as to leave a depth D of material between 100 and 150 microns.
  • the back surface 22 of the die board 16 is marked up to show the outline 24 and creases 26 in the blank being cut and creased. Typically this is done by marking the outline 24 and creases 26 on a sheet of paper which is stuck to the back surface 22, aligned with the respective cutting blades 18 and creasing rules 4.
  • Strips of force correcting tape 28 are selectively placed over the crease lines 26, where needed, in order that the creasing force and depth is consistent over the blank. Generally it has been found that the majority or all of the creases will need tape applying to the die board. In areas where the tape 28 is applied, a greater force will be produced.
  • the correction tape 28 is typically a dense but tearable paper or a non-metallised plastics foil. Typical thicknesses of foil are 20, 36, 54 and 68 microns .
  • plastics sheets can be produced to have crease strengths of 400 to 900 inN compared to 1500 or more mN of earlier creased plastics products.
  • the crease strength is that measured in a Messmer crease tester when the crease in a standard 38 mm wide segment is folded through an angle of 60° with the force applied at a distance of 10 mm from the crease.
  • Such equipment and measurements are standard in the industry and need not be explained in detail here.
  • a sheet creased in accordance with the invention can be erected into a suitably shaped carton or merely just a folded component. Due to the relatively low crease strengths obtained using the method and apparatus of the present invention, the creased sheet is particularly suitable for erection into cartons using automatic machinery, producing cartons with crisp corners and flat panels.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

L'invention concerne un procédé de formage à froid d'une ligne de pliage dans un matériau plastique en feuille (14). Ledit procédé consiste à positionner le matériau en feuille (14) sur une surface d'appui plane (2) et à former la ligne de pliage en amenant une règle (4) en contact avec le matériau plastique en feuille (18), puis à déformer ce matériau en feuille entre l'extrémité de la règle (4) et la surface d'appui (2).
PCT/GB2005/003172 2004-08-13 2005-08-12 Pliage de materiaux plastiques en feuilles WO2006016175A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0418165.7 2004-08-13
GB0418165A GB2417010A (en) 2004-08-13 2004-08-13 Creasing plastics sheet materials

Publications (2)

Publication Number Publication Date
WO2006016175A2 true WO2006016175A2 (fr) 2006-02-16
WO2006016175A3 WO2006016175A3 (fr) 2006-04-06

Family

ID=33017517

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/003172 WO2006016175A2 (fr) 2004-08-13 2005-08-12 Pliage de materiaux plastiques en feuilles

Country Status (2)

Country Link
GB (1) GB2417010A (fr)
WO (1) WO2006016175A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008027357A1 (de) * 2008-06-05 2009-12-10 Jenoptik Automatisierungstechnik Gmbh Verpackung mit Sollknicklinie und Verfahren zu deren Herstellung
WO2022240417A1 (fr) * 2021-05-14 2022-11-17 Kimberly-Clark Worldwide, Inc. Emballage polymère souple à rigidité accrue

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2957511A1 (fr) * 2014-06-17 2015-12-23 Tetra Laval Holdings & Finance S.A. Paquet

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1111926B (de) * 1960-07-16 1961-07-27 Hans Blumer Zurichtband zum Hinterlegen der aus Bandstahl gefertigten Messer von Werkzeugen fuerdas Stanzen und/oder Praegen von Karton od. dgl.
DE2752717A1 (de) * 1977-11-25 1979-05-31 Lks Laser Kombinationssysteme Stanzmesserform und deren herstellungsverfahren
FR2456613A1 (fr) * 1979-05-16 1980-12-12 Reine Yvan Procede pour fabriquer des emballages pliants a partir d'une feuille de matiere plastique souple, outillage utilise et emballage obtenu
FR2490143A1 (fr) * 1980-09-17 1982-03-19 Sedat Procede et machine pour preparer l'ebauche d'une boite par pliage d'une feuille de matiere synthetique. ebauche et boite en resultant
US4373929A (en) * 1979-01-22 1983-02-15 Smith Paul W Method and apparatus for cutting and scoring folding container blanks
US4825740A (en) * 1988-03-07 1989-05-02 Mucci Sr Edmund Cutting dies and punches
EP0672602A1 (fr) * 1994-03-16 1995-09-20 Franz Vossen Procédé et dispositif de traitement des feuilles de correction pour une presse utilisant des bandes en acier pour le formage ou la découpe
US5809858A (en) * 1996-12-04 1998-09-22 Deroo, Sr.; Paul Wesley Device for achieving optimum leveling of cutting die and platen components in die cutting machines
JP2000158562A (ja) * 1998-11-27 2000-06-13 Mitsubishi Plastics Ind Ltd プラスチックシート用罫線形成刃
WO2002047888A1 (fr) * 2000-12-14 2002-06-20 Thorsten Seufert Procede de fabrication de contenants d'emballage et d'elements de contenants pliables a partir de feuilles thermoplastiques et coupes d'emballage ainsi fabriquees
US20030104916A1 (en) * 2001-12-03 2003-06-05 Kunitsugu Suzuki Plastic sheet having creasing lines and creasing-line-forming blade for plastic sheet

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH596975A5 (fr) * 1976-09-24 1978-03-31 United Patents Trust Reg
JPH11320669A (ja) * 1998-05-12 1999-11-24 Ks System:Kk プラスチックシート用折罫線刃
DE69825492T2 (de) * 1998-06-17 2005-07-28 Fuji Seal, Inc. Blatt und klinge zur formung einer falte
JP2004098586A (ja) * 2002-09-12 2004-04-02 Tadashi Hashimoto 折り曲げ罫線入りプラスチックシート
JP2004223632A (ja) * 2003-01-21 2004-08-12 Tsukatani Hamono Seisakusho:Kk プラスチックシート加工用刃材及び折り曲げ罫線入りプラスチックシート

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1111926B (de) * 1960-07-16 1961-07-27 Hans Blumer Zurichtband zum Hinterlegen der aus Bandstahl gefertigten Messer von Werkzeugen fuerdas Stanzen und/oder Praegen von Karton od. dgl.
DE2752717A1 (de) * 1977-11-25 1979-05-31 Lks Laser Kombinationssysteme Stanzmesserform und deren herstellungsverfahren
US4373929A (en) * 1979-01-22 1983-02-15 Smith Paul W Method and apparatus for cutting and scoring folding container blanks
FR2456613A1 (fr) * 1979-05-16 1980-12-12 Reine Yvan Procede pour fabriquer des emballages pliants a partir d'une feuille de matiere plastique souple, outillage utilise et emballage obtenu
FR2490143A1 (fr) * 1980-09-17 1982-03-19 Sedat Procede et machine pour preparer l'ebauche d'une boite par pliage d'une feuille de matiere synthetique. ebauche et boite en resultant
US4825740A (en) * 1988-03-07 1989-05-02 Mucci Sr Edmund Cutting dies and punches
EP0672602A1 (fr) * 1994-03-16 1995-09-20 Franz Vossen Procédé et dispositif de traitement des feuilles de correction pour une presse utilisant des bandes en acier pour le formage ou la découpe
US5809858A (en) * 1996-12-04 1998-09-22 Deroo, Sr.; Paul Wesley Device for achieving optimum leveling of cutting die and platen components in die cutting machines
JP2000158562A (ja) * 1998-11-27 2000-06-13 Mitsubishi Plastics Ind Ltd プラスチックシート用罫線形成刃
WO2002047888A1 (fr) * 2000-12-14 2002-06-20 Thorsten Seufert Procede de fabrication de contenants d'emballage et d'elements de contenants pliables a partir de feuilles thermoplastiques et coupes d'emballage ainsi fabriquees
US20030104916A1 (en) * 2001-12-03 2003-06-05 Kunitsugu Suzuki Plastic sheet having creasing lines and creasing-line-forming blade for plastic sheet

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 09, 13 October 2000 (2000-10-13) -& JP 2000 158562 A (MITSUBISHI PLASTICS IND LTD), 13 June 2000 (2000-06-13) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008027357A1 (de) * 2008-06-05 2009-12-10 Jenoptik Automatisierungstechnik Gmbh Verpackung mit Sollknicklinie und Verfahren zu deren Herstellung
WO2022240417A1 (fr) * 2021-05-14 2022-11-17 Kimberly-Clark Worldwide, Inc. Emballage polymère souple à rigidité accrue
GB2622163A (en) * 2021-05-14 2024-03-06 Kimberly Clark Co Flexible polymer packaging with increased rigidity

Also Published As

Publication number Publication date
WO2006016175A3 (fr) 2006-04-06
GB0418165D0 (en) 2004-09-15
GB2417010A (en) 2006-02-15

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