WO2003103957A1 - Materiau en feuille duplex servant a envelopper du metal - Google Patents

Materiau en feuille duplex servant a envelopper du metal Download PDF

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Publication number
WO2003103957A1
WO2003103957A1 PCT/CA2003/000896 CA0300896W WO03103957A1 WO 2003103957 A1 WO2003103957 A1 WO 2003103957A1 CA 0300896 W CA0300896 W CA 0300896W WO 03103957 A1 WO03103957 A1 WO 03103957A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet material
material according
scrim
polyolefm
layer
Prior art date
Application number
PCT/CA2003/000896
Other languages
English (en)
Inventor
Baldev Singh Shokar
Martin Vido
Original Assignee
Interwrap Inc.
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 Interwrap Inc. filed Critical Interwrap Inc.
Priority to AU2003236749A priority Critical patent/AU2003236749A1/en
Publication of WO2003103957A1 publication Critical patent/WO2003103957A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/17—Amines; Quaternary ammonium compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/28—Nitrogen-containing compounds

Definitions

  • the present invention is directed to wrapping materials for use in packaging metal goods. More particularly, it is directed to a two-layer sheet material that reduces corrosion of the wrapped metal goods during handling, transportation and storage.
  • volatile corrosion inhibitors also called vapor phase corrosion inhibitors
  • vapor phase corrosion inhibitors are used in wrapping materials for metal items to protect them from corroding.
  • the volatile corrosion inhibitors By vaporization from a solid or liquid state, the volatile corrosion inhibitors reach the surface of the object to be protected and form a stable bond with the metal surface.
  • the limita- tions for good efficiency are (1) the transfer of the inhibitors to the metallic surface, (2) the rate of transfer, and (3) the effectiveness of the packaging seal around the metal object, i.e. to prevent the inhibitor from escaping into the atmosphere.
  • the present invention provides a sheet material for packaging metal items so as to protect them from corrosion during storage. It has two layers, bonded together only at their edges along the length of the material, in which the other layer is a woven scrim and the inner layer is a polyolefm film having a combination of volatile corrosion inhibitors and contact corrosion inhibitors.
  • the outer layer may be a composite layer in which one or more polyolefm films or coatings, or kraft paper, is laminated to the scrim.
  • the inner layer can slide freely across the outer layer, permitting it to move independently of the outer layer and cling to the wrapped metal items.
  • the unique combination of features provided by the sheet material of the invention results in a mechanically strong and highly effective wrapping material able to constantly and adequately supply corrosion inhibitors to wrapped metal products for a substantial period of time, effectively inhibiting corrosion.
  • Figure 1 is an enlarged cross-sectional view through the sheet material according to the first embodiment of the invention.
  • Figure 2 is an enlarged cross-sectional view through the sheet material according to the second embodiment of the invention.
  • Figure 3 is an enlarged cross-sectional view through the sheet material according to the third embodiment of the invention.
  • Figure 4 is an enlarged cross-sectional view through the sheet material according to the fourth embodiment of the invention.
  • FIGS 1 to 4 show preferred embodiments of the sheet material.
  • the same or similar elements in the various embodiments are indicated by like reference numbers.
  • FIG. 1 illustrates a first embodiment of the invention.
  • Sheet material 2 comprises a scrim 4 and a polyolefm film 6 bonded along opposite edges 8, 10 by strips of adhesive 12.
  • the film 6 is the inner layer, i.e. the layer that contacts the wrapped metal goods, and the scrim is the outer layer.
  • the sheet material of the invention is produced by feeding the layers off rolls and through conventional fabricating equipment, including rollers or laminators.
  • the direction along the length of the material as processed through the production equipment is referred to herein as the "machine direction.”
  • the direction perpendicular to the machine direction is referred to herein as the "cross direction,” being the direction along the width of the sheet material between edges 8 and 10.
  • the scrim 4 is a woven structure made of polyolefm tapes which are fabricated by methods well known in the art.
  • the tapes are about 1.5 to 6 mm in width.
  • the number of tapes in the machine direction is preferably in the range of 4 to 16 tapes per inch.
  • the number of tapes in the cross direction is preferably in the range of 2 to 16 tapes per inch.
  • the dicetex of the tapes (grams per 10,000 meters) is preferably in the range of 500 - 2,500.
  • the weight of the scrim is preferably in the range of 30 to 400 grams per square meter.
  • the width of the scrim 4, and of the sheet material 2 can be any convenient width that can be processed on available production equipment and is suitable for a particular application. It is preferably in the range of 30 to 160 inches.
  • Scrim 4 has high mechanical and tensile strength in both the machine and cross directions. During production of the tapes, they are stretched from three to five times their original length by passing through hot pinch rolls to align polymer chains within the body of the tapes to increase their strength. It is a function of the scrim to impart mechanical strength to sheet material 2.
  • the scrim 4 may be fabricated of any suitable polyolefm, including high density polyethylene, low density polyethylene and polypropy- lene.
  • Film 6 is an extruded film made of any suitable polyolefm, including polyethylene (low density or high density) or polypropylene. The thickness is preferably in the range of 0.5 - 4 mils.
  • the polyolefm of film 6 can be the same as or different from the polyolefm of scrim 4. Film 6 is impermeable to air and water, providing a barrier to protect the wrapped goods from the atmosphere,
  • Polyolefm film 6 incorporates both a volatile corrosion inhibitor and a contact corrosion inhibitor.
  • the volatile corrosion inhibitor is present in concentrations of 0.1 to 5 percent by weight (i.e. relative to the weight of the inner layer).
  • the contact corrosion inhibitor is present in concentrations of 0.5 to 15 percent by weight.
  • the volatile and contact corrosion inhibitors can be selected from ones well known in the art.
  • the volatile corrosion inhibitor can be a nitrite compound such as dicyclohexylammonium nitrite;
  • the contact corrosion inhibitor can be an alkali metal nitrite or benzoate, such as sodium nitrite or sodium benzoate. Any of a wide variety of volatile and contact corrosion inhibitors known in the art can be selected for use in the invention.
  • the volatile corrosion inhibitors are transferred to the metal surface by volatilizing from the solid phase and inhibit corrosion by forming a protective layer around the metal surface.
  • the contact corrosion inhibitors protect by creeping from the . film to the metal surface.
  • the sheet material is preferably able to supply corrosion inhibitors to the metal item for a period of up to two years, effectively inhibiting corrosion.
  • the scrim 4 is bonded to the film 6 by strips of adhesive 12 along edges 8 and 10, i.e. along the edges in the machine direction.
  • the strips of adhesive are narrow relative to the total width of the sheet material. They are preferably in the range of 0.5 - 3 inches.
  • the layers may alternatively be bonded by means of melt bonding or sonic bonding, or other suitable means.
  • the two layers of the sheet material are accordingly unattached except at their edges 8 and 10, and are accordingly free to slide relative to one another across their middle part and thereby work independently have each other in protecting the wrapped item. Not being laminated to the scrim, the inner layer is more free to cling to the wrapped metal item.
  • the natural tendency of a polyolefm film to hold a static charge promotes static cling of the film to the metal item.
  • the close contact of the film 6 and the wrapped item is conducive to transfer of the contact corrosion inhibitor to the metal item.
  • the embodiments of the sheet material shown in Figs. 2 to 4 differ from that in Fig. 1 in having a composite outer layer.
  • the sheet material 20 differs from sheet material 2 in having a film 22 laminated to the outer side of scrim 4.
  • the film 22 is a coating of polyolefm applied to the scrim to impart additional protection against the transmission of air and water into contact with the wrapped item.
  • the film 22 is preferably from 0.5 to 3 mils in thickness and has a weight of 12 to 72 grams per square meter.
  • the polyolefm of film 22 may be any suitable polyolefm, including high and low density polyethylene and polypropylene. It can be the same as or different from the polyolefm of scrim 4 and of film 6.
  • Sheet material 30 differs from sheet material 20 in having the film 32 laminated to the inner side of scrim 4.
  • the film 32 is preferably from 0.5 to 3 mils in thickness and has a weight of 12-72 grams per square meter.
  • the polyolefm of film 32 which may be any suitable polyolefm, including high and low density polyethylene and polypropylene. It can be the same as or different from the scrim 4 and film 6.
  • Sheet material 40 differs from sheet material 2 in that it includes a layer of kraft paper 42 laminated to the inner side of scrim 4 by means of laminating polyolefm layer 44.
  • the kraft paper 42 preferably has a weight in the range of 200 grams per square meter. It imparts strength and moisture-absor- bency to the outer layer.
  • the laminating layer 44 can be any suitable polyolefm, including high and low density polyethylene and polypropy- lene. It can be the same as or different from the polyolefm of scrim 4 and film 6. It has a thickness in the range of 0.5 to 2 mils.
  • the corrosion inhibitors are incorporated into the resin used to make the film of the sheet material by methods well known in the art.
  • the compositions are compounded with a carrier resin in a master batch, which is then mixed and diluted with the base resin used to make the film.
  • a layer of kraft paper instead of a layer of kraft paper, a layer of non- woven fibers can be used.
  • One or more layers may include pigments or other additives, such as flame retardants and UV-resistant compositions, making the product more suitable for particular applications.
  • the outer surface may be treated with an anti-skid coating.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

Cette invention concerne un matériau en feuille servant à emballer des objets métalliques afin de les protéger contre la corrosion lors de leur stockage. Ce matériau en feuille comprend deux couches collées l'une à l'autre uniquement au niveau de leurs bords et sur toute leur longueur. La couche extérieure est un renfort en polyoléfine tissé conférant une résistance mécanique au matériau. La couche intérieure est un film en polyoléfine qui renferme une combinaison d'inhibiteurs de corrosion volatils et d'inhibiteurs de corrosion de contact. La couche extérieure peut être une couche composite contenant des films de polyoléfine ou du papier kraft.
PCT/CA2003/000896 2002-06-11 2003-06-11 Materiau en feuille duplex servant a envelopper du metal WO2003103957A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003236749A AU2003236749A1 (en) 2002-06-11 2003-06-11 Two-layered sheet material for wrapping metal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2,390,273 2002-06-11
CA 2390273 CA2390273A1 (fr) 2002-06-11 2002-06-11 Materiau en feuille a deux couches pour recouvrir des metaux

Publications (1)

Publication Number Publication Date
WO2003103957A1 true WO2003103957A1 (fr) 2003-12-18

Family

ID=29721241

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2003/000896 WO2003103957A1 (fr) 2002-06-11 2003-06-11 Materiau en feuille duplex servant a envelopper du metal

Country Status (3)

Country Link
AU (1) AU2003236749A1 (fr)
CA (1) CA2390273A1 (fr)
WO (1) WO2003103957A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005059188A2 (fr) * 2003-12-15 2005-06-30 Polymer Group, Inc. Lamine de protection et procede de fabrication correspondant
EP2184162A1 (fr) * 2008-11-07 2010-05-12 Nordenia Deutschland Gronau GmbH Matériau d'emballage pour objets en métal sujets à la corrosion
US7838445B2 (en) 2005-05-10 2010-11-23 Interwrap Inc. Multi-layer wrapping material with water vapor-permeable inner layer
WO2013184079A3 (fr) * 2012-06-07 2014-01-30 Atmaz Ambalaj Teksti̇l Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ Matériau d'emballage non composite doté d'une résistance au déchirement élevée

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5958805A (en) * 1998-04-17 1999-09-28 Quinones; Victor Manuel Tear/puncture resistant semi-laminate material
US6242371B1 (en) * 1998-04-17 2001-06-05 Victor Manuel Quinones Tear/puncture resistant semi-laminate material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5958805A (en) * 1998-04-17 1999-09-28 Quinones; Victor Manuel Tear/puncture resistant semi-laminate material
US6242371B1 (en) * 1998-04-17 2001-06-05 Victor Manuel Quinones Tear/puncture resistant semi-laminate material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ASHISH GANDHI, BORIS MIKSIC: "Lay-up of Cooling Towers and Boilers with Volatile Corrosion Inhibitors", CORROSION 2001, CORTEC CORPORATION, pages 1 - 6, XP002256368, Retrieved from the Internet <URL:http://www.cortecvci.com/Publications/Papers/Watertreatment/LAYUP2watertreat.html> [retrieved on 20030926] *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005059188A2 (fr) * 2003-12-15 2005-06-30 Polymer Group, Inc. Lamine de protection et procede de fabrication correspondant
WO2005059188A3 (fr) * 2003-12-15 2005-12-15 Polymer Group Inc Lamine de protection et procede de fabrication correspondant
GB2424852A (en) * 2003-12-15 2006-10-11 Polymer Group Inc Protective laminate and method for making the same
US7838445B2 (en) 2005-05-10 2010-11-23 Interwrap Inc. Multi-layer wrapping material with water vapor-permeable inner layer
EP2184162A1 (fr) * 2008-11-07 2010-05-12 Nordenia Deutschland Gronau GmbH Matériau d'emballage pour objets en métal sujets à la corrosion
EP2457726A1 (fr) * 2008-11-07 2012-05-30 Nordenia Deutschland Gronau GmbH Matériau d'emballage pour objets en métal sujets à la corrosion
WO2013184079A3 (fr) * 2012-06-07 2014-01-30 Atmaz Ambalaj Teksti̇l Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ Matériau d'emballage non composite doté d'une résistance au déchirement élevée

Also Published As

Publication number Publication date
AU2003236749A1 (en) 2003-12-22
CA2390273A1 (fr) 2003-12-11

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