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Blended polymeric draw tapes

a polymer and draw tape technology, applied in the direction of flexible container closures, transportation and packaging, sacks, etc., can solve the problems of unattainable combined sealability and tensile strength by prior art multi-layer or single-layer films, and achieve the effect of low elongation and high strength

Inactive Publication Date: 2005-03-24
COVALENCE SPECIALTY MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] It is an object of the invention to provide an oriented polymeric tape having a blend of polymeric components that is singular in construction. It is a further object of the inventive draw tape that the draw tape is made by blown process as known in the art. This blown tape is then further physically stretched or oriented in machine direction to impart higher strength and low elongation.

Problems solved by technology

This combined sealability and tensile strength are not achievable by prior art multi-layer or single layer films.

Method used

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  • Blended polymeric draw tapes
  • Blended polymeric draw tapes

Examples

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example 1

[0024] A draw tape was constructed from a polymeric blend consisting of approximately 87.5% high-density polyethylene (HDPE), 10% low-density polyethylene (LDPE) and 2.5% of color concentrate. The HDPE used in this illustrative embodiment was a bimodal distribution high molecular weight material with an at least a density of approximately 0.952 and a melt index of approximately 0.055. The LDPE is a HPLD grade material having a melt index of 2.0 and a density of approximately 0.92. The addition of LDPE acts as a synergistic agent in improving the tensile performance of the draw tape. The color concentrate is pigment dispersed in a 2.0 MI LDPE carrier. The polymeric blend was made into a film by a blown process as known in the art. The blown film was made to approximately 9 mil thick and was then oriented in a machine direction yielding around 1.3 mil thick film. The orientation of the film imparts higher strength and lower elongation. In this particular illustrative embodiment the or...

example 2

[0025] A draw tape was constructed from a polymeric blend consisting of approximately 75% high-density polyethylene (HDPE), 20% metallocene polyethylene (mLDPE) and 5% of color concentrate. The HDPE used in this illustrative embodiment was a bimodal distribution high molecular weight material having a density of approximately 0.952 and a melt index of approximately 0.055. The mLDPE used within the example had a melt index of approximately 1.0 and a density of approximately 0.92. The polymeric blend according to this example was made into a film by a blown process as known in the art. The blown film was made to approximately 6 mil thick and was then oriented in a machine direction to yield around 1.0 mil thick film.

example 3

[0026] A draw tape was constructed from a polymeric blend consisting of approximately 67.5% high-density polyethylene (HDPE), 30% metallocene polyethylene (mLDPE) and 2.5% of color concentrate. The HDPE used in this illustrative embodiment was a bimodal distribution high molecular weight material having a density of approximately 0.952 and a melt index of approximately 0.055. The mLDPE used within this illustrative example had a melt index of approximately 1.0 and a density of approximately 0.92. The polymeric blend according to this illustrative example was made into a film by a blown process as known in the art. The blown film was made to approximately 6 mil thick and was then oriented in a machine direction yielding around 1.0 mil thick film.

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Abstract

The present invention relates to a draw tape bag having a draw tape made of a polymeric blend of first and second polymeric components having varying densities. The polymeric blend is formed into a film by a blown process known in the art. The film is oriented providing strength and reduced elongation allowing the draw tape bag to be held without sagging or failure under load during usage. The polymeric blend imparts to the draw tape material a sealability and tensile strength that is not achievable by the multi-layer films or single layer films used in the prior art.

Description

RELATED APPLICATIONS [0001] This application claims priority from U.S. Provisional Patent Application No. 60 / 502,814 entitled Blended Polymeric Draw Tapes filed on Sep. 12, 2003, the entirety of which is hereby incorporated by reference.FIELD OF THE INVENTION [0002] The instant invention relates to draw tape bags wherein an oriented blended polymeric draw tape is provided to improve the performance and ease of use of the draw tape bag. BACKGROUND OF THE INVENTION [0003] Draw tape bags have been commercially available for many years. For example, draw tape or draw cord bags are generally described in U.S. Pat. Nos. 2,798,523; 3,029,853; 3,506,048 and 3,687,357. Draw tape bags have been typically formed by employing two or more pliable layers joined together forming a draw tape that is fastened to the bag. Typically, a tubular hem is provided at the open edge of each sheet and contains a drawstring or tape made from a pliable thermoplastic strip. One or more access holes are provided ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65D33/28C08L23/06
CPCB65D33/28C08L23/06C08L2205/02C08L2666/06
Inventor KANNABIRAN, RENGAN
Owner COVALENCE SPECIALTY MATERIALS CORP
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