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WO2000037543A1 - Procede permettant d'envelopper une pile d'elements avec une enveloppe constituee d'une feuille en gaine et feuille en gaine utilisee - Google Patents

Procede permettant d'envelopper une pile d'elements avec une enveloppe constituee d'une feuille en gaine et feuille en gaine utilisee Download PDF

Info

Publication number
WO2000037543A1
WO2000037543A1 PCT/DE1999/004006 DE9904006W WO0037543A1 WO 2000037543 A1 WO2000037543 A1 WO 2000037543A1 DE 9904006 W DE9904006 W DE 9904006W WO 0037543 A1 WO0037543 A1 WO 0037543A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubular film
film
film according
stack
polyolefins
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.)
Ceased
Application number
PCT/DE1999/004006
Other languages
German (de)
English (en)
Inventor
Hans Peter Walser
Franz Possemeyer
Helmut Olberding
Michael Kreymborg
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.)
Nordfolien GmbH
Original Assignee
Nordenia Verpackungswerke GmbH
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
Priority claimed from DE19960663A external-priority patent/DE19960663B4/de
Application filed by Nordenia Verpackungswerke GmbH filed Critical Nordenia Verpackungswerke GmbH
Priority to AU22778/00A priority Critical patent/AU2277800A/en
Priority to PL342318A priority patent/PL202384B1/pl
Publication of WO2000037543A1 publication Critical patent/WO2000037543A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B65D71/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans or pop bottles; Bales of material
    • B65D71/06—Packaging elements holding or encircling completely or almost completely the bundle of articles, e.g. wrappers
    • B65D71/08—Wrappers shrunk by heat or under tension, e.g. stretch films or films tensioned by compressed articles
    • 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
    • B65B9/13—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 preformed tubular webs being supplied in a flattened state
    • B65B9/135—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 preformed tubular webs being supplied in a flattened state for palletised loads
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets

Definitions

  • the invention relates to a method for wrapping a stack of individual pieces arranged side by side and one above the other, for example sacks containing bulk material, in which the tubular film is pulled from a tubular film magazine in sections to form a tubular hood, opened, gathered in the pulling direction, separated and at the separation point is closed and expanded with stretching and the gathered and widened hose hood thus formed is then pulled over the stack with dissolution of the gathering and is thus placed prestressed on the stack.
  • the invention also relates to a tubular film used in carrying out the method.
  • tubular hoods made of so-called “stretch film” for wrapping a stack of individual pieces.
  • stretch films are elastic so that, after appropriate stretching, they press against the stack under tension in order to prevent the packed individual pieces in the stack from slipping to back up.
  • the stretchability of foils results from the area of elastic stretching which initially begins during stretching and the area of plastic deformation which then follows as stretching continues, until tearing.
  • the delivery dimensions of known hose hoods are therefore dimensioned such that their widening dimension, which is dependent on the stack size or pallet size, is still in the range of the elastic expansion, so that a sufficient pretensioning force can be established for securing the goods stack.
  • bags with free-flowing contents are already ventilated to such an extent before they are stacked on pallets that they no longer give way when they are packed on the pallet.
  • the situation is different for free-flowing but compressible filling goods such as peat products and potting soil. These partially compress during pallet transport, so that the wrapping of the stretch film is no longer so tight because the prestressing force resulting from the elasticity is lower, the further the stretching approaches the starting position in the hose hood.
  • the stacked sacks may slip.
  • the invention has for its object to make current wrappings with stretch hood films permanently safer. They should be more elastic and still run smoothly on existing systems and under all conditions.
  • This object is achieved in that a highly elastic film with a stretchability of about 50% to more than 1200% is used as the tubular film.
  • the elasticity with the same or higher cohesive strengths is increased so that the compressible goods during transport and storage, for example peat products, in flexible packaging such as sacks do not slip in the stack, that is to say on the pallet.
  • the high stretchability makes it possible to cover a wide range of expansion dimensions with material costs-saving, relatively small delivery dimensions for hose hoods, so that various, even older, systems can still be used.
  • This is also achieved in that the elasticity of the film, particularly in the transverse direction, is advantageously increased to such an extent that different pallet sizes can be packed with a tubular film circumference, ie a delivery dimension.
  • Pallet formats from 800 x 1200 mm to 1100 x 1300 mm are common in the industrial sector.
  • the stretchability of the tubular film used is up to 1200% advantageous compared to the initial scope. Since the film can become thinner with this strong stretching, the film strength is adapted accordingly by using the raw materials and manufacturing processes of the tubular film.
  • Tensioning forces that hold the packaged stack together are produced essentially by the stretched tube cover by the widening, in which the foil is stretched mainly horizontally, and thus transversely to the longitudinal axis of the foil tube.
  • films are usually oriented lengthways, i.e. Because of the predominantly longitudinal orientation of the molecules, the films have a higher strength in the longitudinal direction and a reduced elasticity.
  • the film according to the invention has an increased elastic extensibility of 70% to 150% compared to the unstretched film, the transverse elasticity being approximately advantageous is the same, preferably greater than its longitudinal elasticity.
  • a tubular film is particularly advantageous, the longitudinal elasticity of which is approximately 70% to 80% of its transverse elasticity.
  • the delivery dimension i.e. the diameter of the film tube processed in the packaging machine may be about 20% to 65% smaller than the circumference of the stack to be wrapped.
  • Different pallet dimensions of the packaging can therefore be covered with one and the same machine, which is set up for such small film tube dimensions and, above all, with one and the same film tube, in terms of its dimensions.
  • Balanced properties can be present in tubular films which contain polyolefins, in particular copolymers of polyethylene.
  • polyolefins in particular copolymers of polyethylene.
  • metallocene-catalyzed low-density polyolefins preferably metallocene-catalyzed copolymers of polyethylene with a density below 0.9 g per cm 3 , for example PE copolymers with hexene, pentene, heptene or octene, makes it easier for the tubular film to have balanced properties.
  • the high-percentage copolymers of PE like EVA allow the production of highly elastic films. They are easy to process.
  • the metallocene PEs (mPE) mentioned allow even more elastic films, but are more difficult to process
  • a film according to the invention can be formed in one layer or also in multiple layers. Since the materials that make up highly elastic films have a rubber-like character, their processability on machines may be disturbed. In the case of multilayer foils, however, a trouble-free machine run can be achieved, however, by providing a highly elastic layer on the outside with corresponding cover layers that ensure trouble-free machine run.
  • the cover layers can be polyolefins, for example PE homopolymers. Low-percentage PE copolymers with a copolymer content below 5% are particularly suitable, which can also contain antiblocking agents.
  • a middle layer containing such materials, the molecules are in a balanced orientation. This results in properties that are equalized both in the transverse direction and in the longitudinal direction, in particular elastic properties, but also with regard to strength.
  • the stretch behavior of the top layers is inevitably less than that of the middle layer.
  • the cover layers are therefore as thin as possible so that the elastic behavior of the multilayer film is not disturbed.
  • a film has proven to be suitable, the middle layer of which is about 4 to 5 times thicker than the top layer.
  • the total thickness of a suitable film is around 70 to 150 ⁇ m, most of which is due to the thickness of the middle layer.
  • Measures in film production with machines and / or by stipulations for the manufacturer of the machines and also by recipes and mixtures of the film raw materials used according to the invention by the film producer can also achieve the advantage that the thickness tolerances of the layer thicknesses are as small as possible and no abrupt ones There are transitions from under to over thickness.
  • the thickness tolerances of less than ⁇ 8% based on the average thickness of a layer, preferably less than + 3%, are particularly preferred because they are optimal for economical production of the films, ⁇ 3% to 6%.
  • Such a tubular film can be stretched elastically to 60% to 150% compared to the supplied film, with sufficient pretensioning forces remaining in the stretching range of 45% to 135% after the expansion has been removed and applied to the wrapped stack of goods.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)

Abstract

Pour envelopper une pile d'éléments juxtaposés ou superposés, par exemple, de sacs contenant des produits en vrac, on tire d'un magasin de gainage et par sections une feuille en gaine pour former un gainage. On ouvre cette feuille en gaine et on la fronce dans le sens de traction ; on la détache ; on la scelle à l'endroit de séparation et on l'élargit par allongement. Le gainage ainsi froncé et élargi est ensuite tiré sur la pile par suppression du fronçage et ainsi appliqué prétendu sur la pile. La feuille en gaine utilisée contient de la polyoléfine, notamment des copolymères du polyéthylène et/ou de la polyoléfine catalysée métallocène, et est donc élastiquement extensible d'environ 70 % à 150 %.
PCT/DE1999/004006 1998-12-18 1999-12-16 Procede permettant d'envelopper une pile d'elements avec une enveloppe constituee d'une feuille en gaine et feuille en gaine utilisee Ceased WO2000037543A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU22778/00A AU2277800A (en) 1998-12-18 1999-12-16 Method for covering a stack of individual pieces in a blown-film hood and blown film for use with said method
PL342318A PL202384B1 (pl) 1998-12-18 1999-12-16 Sposób osłaniania stosu i folia rękawowa stosowana w tym sposobie

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19858773.2 1998-12-18
DE19858773 1998-12-18
DE19960663.3 1999-12-15
DE19960663A DE19960663B4 (de) 1998-12-18 1999-12-15 Verfahren zum Umhüllen eines Stapels aus Einzelstücken mit einer Haube aus Schlauchfolie sowie bei dem Verfahren anzuwendende Schlauchfolie

Publications (1)

Publication Number Publication Date
WO2000037543A1 true WO2000037543A1 (fr) 2000-06-29

Family

ID=26050869

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/004006 Ceased WO2000037543A1 (fr) 1998-12-18 1999-12-16 Procede permettant d'envelopper une pile d'elements avec une enveloppe constituee d'une feuille en gaine et feuille en gaine utilisee

Country Status (3)

Country Link
AU (1) AU2277800A (fr)
PL (1) PL202384B1 (fr)
WO (1) WO2000037543A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1013549B1 (fr) * 1998-12-23 2003-04-16 Maschinenfabrik Möllers GmbH u. Co. Procédé et dispositif pour envelopper une pile d'objets
US7411026B2 (en) 2003-08-11 2008-08-12 Exxonmobil Chemical Patents Inc. Polymers of ethylene and, optionally, copolymerizable esters, films using such polymers and stretch hood packaging processes using such films
WO2012001182A1 (fr) 2010-07-02 2012-01-05 Dow Global Technologies Llc Housses étirables réalisées à partir de formulations riches en uldpe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3837478A (en) * 1970-04-30 1974-09-24 Grip Pak Inc Stretchable packaging device for containers
US4499706A (en) * 1983-05-19 1985-02-19 Exxon Research & Engineering Co. Pass through stretch wrapping process
DE3440100A1 (de) * 1984-11-02 1986-05-22 Dr. Welp Entwicklungs-Kommanditgesellschaft, 6350 Bad Nauheim Verpackung sowie verfahren zum verpacken eines stapels von filmkarten und einsetzen desselben in eine filmkartenkassette einer filmkartenkamera
DE4401613A1 (de) * 1994-01-20 1995-07-27 Lachenmeier Kurt Aps Folienhaube zum Überziehen über Güterstapel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3837478A (en) * 1970-04-30 1974-09-24 Grip Pak Inc Stretchable packaging device for containers
US4499706A (en) * 1983-05-19 1985-02-19 Exxon Research & Engineering Co. Pass through stretch wrapping process
DE3440100A1 (de) * 1984-11-02 1986-05-22 Dr. Welp Entwicklungs-Kommanditgesellschaft, 6350 Bad Nauheim Verpackung sowie verfahren zum verpacken eines stapels von filmkarten und einsetzen desselben in eine filmkartenkassette einer filmkartenkamera
DE4401613A1 (de) * 1994-01-20 1995-07-27 Lachenmeier Kurt Aps Folienhaube zum Überziehen über Güterstapel

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1013549B1 (fr) * 1998-12-23 2003-04-16 Maschinenfabrik Möllers GmbH u. Co. Procédé et dispositif pour envelopper une pile d'objets
US7411026B2 (en) 2003-08-11 2008-08-12 Exxonmobil Chemical Patents Inc. Polymers of ethylene and, optionally, copolymerizable esters, films using such polymers and stretch hood packaging processes using such films
US7632573B2 (en) 2003-08-11 2009-12-15 Exxonmobil Chemical Patents Inc. Polymers of ethylene and, optionally, copolymerizable esters, films using such polymers and stretch hood packaging processes using such films
WO2012001182A1 (fr) 2010-07-02 2012-01-05 Dow Global Technologies Llc Housses étirables réalisées à partir de formulations riches en uldpe
WO2012003510A1 (fr) 2010-07-02 2012-01-05 Dow Global Technologies Llc Couvercles à allongement constitués à partir de formules riches en uldpe
US9238355B2 (en) 2010-07-02 2016-01-19 Dow Global Technologies Llc Stretch hoods made from ULDPE-rich formulations

Also Published As

Publication number Publication date
AU2277800A (en) 2000-07-12
PL342318A1 (en) 2001-06-04
PL202384B1 (pl) 2009-06-30

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