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Unidirectional Oriented Polyethylene-Based Heat Shrinkable Polymeric Label

a technology of unidirectional orientation and heat shrinkage, applied in the direction of identification means, instruments, seals, etc., can solve the problems of unbalanced tensile properties of uniaxal oriented cast polypropylene films, poor storage stability of conventional films, and shrinkage, etc., to achieve high molecular weight, improve processing properties, shrinkage properties or optical properties, and improve tensile properties or optical properties

Pending Publication Date: 2014-02-27
CCL LABEL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a special polyethylene label that can shrink in a certain direction when exposed to heat. This label is made from a special type of polyethylene film that has been printed and cut to fit a specific product. The polyethylene can be high or low density, or a mixture of both. The film may also contain additives to improve its properties. The label is made by a special process that makes it great at shrinking in one direction but resistant in the other. The label can be used on products like containers, bottles, or batteries, and is attached using a strong adhesive and a release liner. This invention allows for more precise and consistent labeling of products.

Problems solved by technology

In the prior art, roll-fed MD (machine direction) heat shrinkable polyolefin films exhibit shrinkage of about 25% at 135° C. The films often have poor storage stability exhibiting considerable shrinkage when stored at temperatures of 60° C. or higher.
Conventional films may also have poor seam integrity when used in conjunction with hot melt adhesives in label applications.
Machine direction uniaxal oriented cast polypropylene films have been characterized as having unbalanced tensile properties, poor film flatness, high shrinkage forces, high shrink temperatures and maximum shrinkage of 40 percent.

Method used

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  • Unidirectional Oriented Polyethylene-Based Heat Shrinkable Polymeric Label
  • Unidirectional Oriented Polyethylene-Based Heat Shrinkable Polymeric Label
  • Unidirectional Oriented Polyethylene-Based Heat Shrinkable Polymeric Label

Examples

Experimental program
Comparison scheme
Effect test

example 1

Shrinkage of a Single Layer

[0042]Table 1 provides the percent shrinkage of a non-shrink biaxial orientation polyethylene-based monolayer label (Sample #1, 110 gauge) compared to polyethylene-based unidirectional-oriented polyethylene-based heat shrinkable monolayer label produced by biaxial orientation followed by uniaxial machine direction orientation (Sample #2, 75 gauge; #3, 110 gauge; #4, 150 gauge; #5, 175 gauge; and #6, 200 gauge).

TABLE 1TemperatureSample Shrinkage(° C.)Direction#1#2#3#4#5#670Machine03.52.51.510Traverse−0.5−1010080Machine0.55.5532.52Traverse−0 .5−10−0.500.590Machine1995.565Traverse0−100−0.5−1100Machine1.51414996Traverse−0.5−1.5−1−1−1−1120Machine27675557128Traverse−1−4−4−3−5−4130Machine68382858482Traverse−4−3−4−4−5−6

example 2

Shrinkage of a Laminate

[0043]Table 2 provides label shrinkage of a two-film lamination label. Samples #7-#9 are a lamination of two films where both films are polyethylene-based unidirectional-oriented polyethylene-based heat shrinkable films produced by biaxial orientation followed by machine direction orientation. Samples #10-#11 are a lamination of two films where the outside film is a polyethylene-based unidirectional-oriented polyethylene-based heat shrinkable film produced by biaxial orientation followed by machine direction orientation and the inside film is a non-shrink biaxial orientation polyethylene-based film. Films used in the labels are selected from the films listed in Table 1. Specifically Sample #7 is a lamination of #3 (100 gauge) and #2 (75 gauge); Sample #8 is a lamination of two #2 films (each 75 gauge); Sample #9 is a lamination of #4 (150 gauge) and #2 (75 gauge); Sample #10 is a lamination of #3 (100 gauge) and #1 (110 gauge); and Sample #11 is a lamination o...

example 3

Properties of Single and Multilayer Labels

[0044]Table 3 provides the tensile and optical properties of a non-shrink biaxial orientation polyethylene-based film (#1, 110 gauge) and polyethylene-based unidirectional-oriented heat shrinkable films produced by biaxial orientation followed by uniaxial machine direction orientation (#2, 75 gauge; #3, 110 gauge; #4, 150 gauge; #5, 175 gauge; #6, 200 gauge) and of two-film lamination labels. Lamination Samples #7-#9 where composed of two films, each being a polyethylene-based unidirectional-oriented polyethylene-based heat shrinkable film produced by biaxial orientation followed by machine direction orientation (#7, 110 gauge+75 gauge; #8, 200 gauge+75 gauge; #9, two 75 gauge films). Lamination Samples #10-#11 were composed of two films where the outside film was a polyethylene-based unidirectional-oriented heat shrinkable film produced by biaxial orientation followed by machine direction orientation and the inside film was a non-shrink bia...

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Abstract

The present invention features pressure-sensitive labels produced from unidirectional heat shrinkable polyethylene films and their application to consumer products such as containers, tubes, bottles and batteries.

Description

[0001]This patent application claims the benefit of priority from U.S. Provisional Application Ser. No. 61 / 445,803 filed Feb. 23, 2011 and from U.S. Provisional Application Ser. No. 61 / 492,957 filed Jun. 3, 2011, the content of each of which is herein incorporated by reference in its entirety.INTRODUCTIONBackground of the Invention[0002]Unidirectional heat shrinkable films have been used to label and decorate containers and items based on transverse direction or machine direction shrinkage. Transverse direction shrink films are typically converted to sleeves prior to application to the container or item to be labeled. Machine direction shrink films are applied by a roll fed method or in certain applications as a pressure-sensitive label. Such heat shrinkable films have been produced from polyvinyl chloride (PVC) and polystyrene (OPS) for applications related to pressure-sensitive labels for cylindrical dry cell batteries. Other heat shrinkable films based on polyethylene terephthala...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65D65/22B32B7/028
CPCB65D65/22B32B27/08B32B27/32G09F3/10B32B2250/02B32B2307/412B32B2307/516B32B2307/518B32B2307/736B32B2519/00C08J5/18C08J2323/06C08J2323/08B32B7/028B32B27/10
Inventor MCKILLIP, BARRON G.HOSTETTER, BARRYWIEGAND, EDWARDWEYERMANN, ULRICH E.MARTIN, WILLIAM J.
Owner CCL LABEL INC
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