Method and system for folding and sealing bags

Inactive Publication Date: 2011-01-27
COATING EXCELLENCE INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]The invention relates to a bag to be filled with contents, the bag including a polymeric tube having a first panel, a second panel and side gussets, and the first panel having a first section and a second section. An end of the tube has a stepped construction, which includes the second section, and portions of the side gussets extending beyond the second section and a portion of the second panel extending beyond the side gussets. First adhesive material on the first section and second adhesive material on the stepped construction attain adhesive states by heating to a temperature below the softening point temperature of the polymeric material. The tube has a third section between the first section and the second section. The first adhesive material and the second adhesive material are absent from the third section wherein the third section is free of adhesive. The end of the tube is closed. The tube is folded along the third section without displacing or expelling adhesive from the third section in order to minimize adhesive contamination on surfaces of the tube, and the adhesive material on the stepped construction and the adhesive material on the first section meet in contact and under pressure below the third section and provide an adhesive-to-adhesive seal at the end of the bag.
[0006]Another embodiment of the invention relates to a bag constructed of polymeric material and adapted to be closed and sealed after being filled with contents. The bag includes a first panel, a second panel and side gussets, the first panel having a first section and a second section. The bag has one closed end. An end of the bag through which the bag is to be filled with contents has a stepped construction, which includes the second section, portions of the side gussets extending beyond the second section and a portion of the second panel extending beyond the portions of the side gussets. First adhesive material on the first section and second adhesive material on the stepped construction attain adhesive states by heating to a temperature below the softening point temperature of the polymeric material. The first panel has a third section between the first section and the second section. The first adhesive material and the second adhesive material are absent from the third section, wherein the third section is free of adhesive. The end of the bag is closable and the bag is foldable along the third section without displacing or expelling adhesive from the third section in order to minimize adhesive contamination on surfaces of the tube, and the adhesive material on the stepped construction and the adhesive material on the first section meet in contact and under pressure below the third section and provide an adhesive-to-adhesive seal at the end of the bag.
[0007]Another embodiment of the invention relates to a method for closing and sealing an end of a bag taken from multiple bags each made of polymeric material. The bag has a first adhesive material on a first section of a first panel, and has a second adhesive material on a stepped construction, which includes a second section of the first panel, portions of side gussets extending beyond the first panel and a portion of a second panel extending beyond the side gussets. Further, the method includes, heating the first adhesive material and the second adhesive material to their adhesive states, while conveying the bag along a hot air manifold after the bag has been filled with contents, and the bag closed and creased. The first adhesive material and the second adhesive material are absent from a third section of the first panel, wherein the third section is free of adhesive. The method includes conveying the third section free of adhesive along a section of the hot air manifold, which minimizes adhesive contamination. Further, the method includes folding the bag along the third section without displacing or expelling adhesive from the third section, which minimizes adhesive contamination of surfaces of the tube, and applying pressure to contact the first adhesive material and the second adhesive material and form an adhesive-to adhesive seal, which seals the end of the bag through which the bag has been filled with contents.

Problems solved by technology

The adhesive material can transfer to the hot air manifold and associated mechanisms, causing equipment contamination.

Method used

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  • Method and system for folding and sealing bags
  • Method and system for folding and sealing bags
  • Method and system for folding and sealing bags

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Embodiment Construction

[0020]Bags to be used for bulk packaging of granular or finely ground materials, such as nutrients including, but not limited to, whole and ground grains, seeds, dry pet food, chemical fertilizers, other bulk food and non-food products, and growing plant treatments, must be durable to resist material degradation, abrasion, puncture, contamination and leakage of contents, and must withstand a drop test while sealed and filled with contents weighing up to about 50 pounds, and even up to about 80 pounds. Moreover, such bags are typically disposed of after use, which requires an inexpensive and light-weight construction that is environmentally friendly, may be recyclable, and reduces waste in the supply chain from production, use of the bag, to disposal in either a recycling stream or landfill.

[0021]Currently, multi-walled paper and polymer layer bags, consisting of multiple paper layers and layers of polymer film, are heavy, expensive to produce and ship, easy to tear and puncture, and...

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Abstract

A system including multiple bags each having a first adhesive material on a first panel, and second adhesive material on a stepped construction of the bag, and a third section of each bag being free of adhesive, further including a hot air manifold along which the bag is conveyed after the bag has been filled with contents and closed, which heats the first adhesive material and the second adhesive material to their adhesive states; a section of the hot air manifold along which the third section free of adhesive is conveyed, which minimizes adhesive contamination; a blade to bias the stepped construction of the bag to follow along the manifold; and a trailing end of the blade to fold the bag along its third section without displacing or expelling adhesive from the third section, which minimizes adhesive contamination of surfaces of the bag.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a continuation in part of U.S. application Ser. No. 12 / 685,785, filed Jan. 12, 2010 (Attorney Docket E4919-00160), which is a Continuation-in-Part of U.S. patent application Ser. No. 12 / 508,710, filed Jul. 24, 2009 (E4919-00154), which claims the benefit of U.S. Provisional Patent Application No. 61 / 180,271, filed May 21, 2009 (E4919-00147) and the benefit of U.S. Provisional Patent Application No. 61 / 139,994, filed Dec. 22, 2008 (E4919-00144).FIELD OF THE INVENTION[0002]This invention relates to polymeric bags, and a method and system for folding and sealing such bags.BACKGROUND OF THE INVENTION[0003]US 2010 / 0154362 A1 discloses a method and system for closing and sealing bags, wherein each bag after filling with contents is conveyed along a hot air manifold which applies hot air under pressure to heat an adhesive layer on a first panel of the bag and to heat an adhesive layer on a second panel of the bag. Each of the ...

Claims

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Application Information

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IPC IPC(8): B65D30/20
CPCB31B19/60B31B19/62B31B2219/29B65B51/10B65D31/10B65D33/22B65B51/02B31B2219/6007B31B70/62B31B70/004
InventorSARGIN, GARY
OwnerCOATING EXCELLENCE INT