WRAPPING MATERIAL COMPRISING A MULTILAYER FILM AS TEAR STRIP

• US 20070237918A1
• Filed: 04/06/2006
• Published: 10/11/2007
• Est. Priority Date: 04/06/2006
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Jonza, James, Heinz, Robert
• Application Number:
  US11/278,892
• Publication Number:
  US 20070237918A1
• Time in Patent Office: Days
• US Class Current: 428/43
• CPC Class Codes: B32B 2250/05 5 or more layers
• CPC Class Codes: B32B 2250/40 Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
• CPC Class Codes: B32B 2307/40 having particular optical properties light or UV resistant B32B2307/71
• CPC Class Codes: B32B 2307/42 Polarizing, birefringent, filtering
• CPC Class Codes: B32B 2307/514 Oriented
• CPC Class Codes: B32B 2307/582 Tearability
• CPC Class Codes: B32B 2307/706 Anisotropic
• CPC Class Codes: B32B 2553/00 Packaging equipment or accessories not otherwise provided for
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/302 comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: Y10T 428/15 Sheet, web, or layer weakened to permit separation through thickness

Abstract

In accordance with one aspect, there is provided a wrapping material for wrapping an article, said wrapping material comprising a tear strip associated therewith, wherein said tear strip comprises a multilayer film comprising alternating layers of at least a first and second polymer, said multilayer film having a first optical appearance at a first observation angle and a second optical appearance at a second observation angle different from said first observation angle, said second optical appearance being different from the first optical appearance.

Claims

1. Wrapping material for wrapping an article, said wrapping material comprising a tear strip associated therewith, wherein said tear strip comprises a multilayer film comprising alternating layers of at least a first and second polymer, said multilayer film having a first optical appearance at a first observation angle and a second optical appearance at a second observation angle different from said first observation angle, said second optical appearance being different from the first optical appearance.

2. Wrapping material according to claim 1 wherein said multilayer film appears substantially clear at said first observation angle and colored at said second observation angle and said multilayer film having a series of layer pairs having an optical thickness of 360 nm to 450 nm.

3. Wrapping material according to claim 1 wherein said tear strip further comprises a layer of adhesive on a first major side of said multilayer film.

4. Wrapping material according to claim 1 wherein said multilayer film comprises on one major side a relief structure defining indicia.

5. Wrapping material according to claim 4 wherein said tear strip further comprises on a second major side of said multilayer film opposite to said first major side, a colored layer.

6. Wrapping material according to claim 5 wherein said colored layer defines an image.

7. Wrapping material according to claim 6 wherein said image comprises indicia that are in register with said relief structure defining indicia.

8. Wrapping material according to claim 4 wherein said raised structures display a color different from the color displayed by the background between said relief structure at said observation angle.

9. Packaged article comprising a wrapping material as defined in claim 1.

10. Method of authenticating an article comprising wrapping an article with a wrapping material as defined in claim 1.