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KR-102961981-B1 - heat sealing member

KR102961981B1KR 102961981 B1KR102961981 B1KR 102961981B1KR-102961981-B1

Abstract

Various improvements to heat seals by sealing layers that provide a reduced possibility of over-sealing the heat seal to a container are provided in this application. Such improvements include using a combination of various types of resins to provide desired heating and sealing properties. Additionally, heat seals may be particularly suitable for use with polyester containers, such as those containing polyethylene terephthalate.

Inventors

  • 자모라 라파엘
  • 파텔 미테슈쿠마르 비.

Assignees

  • 셀리그 실링 프로덕츠, 아이엔씨.

Dates

Publication Date
20260507
Application Date
20210212
Priority Date
20200214

Claims (20)

  1. As a sealing member for sealing a rim surrounding a container opening, the sealing member is, induction heating layer; and A heat seal laminate for bonding to the above edge, wherein the heat seal laminate comprises a first resin layer and a second resin layer, wherein the second resin layer is a heat seal layer for adhering to the above edge upon installation, and the first resin layer is an adhesion promoter for adhering the induction heating layer to the second resin layer, and A sealing member comprising a first resin layer comprising a copolymer of ethylene and acrylic acid, and a second resin layer comprising a modified ethylene acrylate resin.
  2. A sealing member according to claim 1, wherein the second resin layer has a lower vicat softening point than the first resin layer.
  3. A sealing member according to claim 1, wherein the first resin layer has a melting point of 95 to 105 ℃ and the second resin layer has a melting point of 85 to 100 ℃.
  4. A sealing member according to claim 1, wherein the ratio of the thickness of the first resin layer to the second resin layer is in the range of 1:1 to 28:7.
  5. In claim 1, the sealing member is a sealing member lacking a polyester material.
  6. In claim 1, the heat sealing laminate is a sealing member lacking a polyester material.
  7. A sealing member according to claim 1, wherein the first resin layer comprises a first resin of 10 to 30 g/ m² and the second resin layer comprises a second resin of 5 to 30 g/ m² .
  8. In claim 1, the heat seal laminate is a sealing member having a thickness of 25 to 40 microns.
  9. A sealing member according to claim 1, wherein the heat seal laminate is a coextrusion of the first resin layer and the second resin layer.
  10. In claim 1, the sealing member is a tabbed sealing member having an upper laminate portion positioned above the induction heating layer, and a portion of the upper laminate portion forms a gripping tab.
  11. In claim 10, the gripping tab is a sealing member that is completely defined within the perimeter of the sealing member.
  12. A sealing member according to any one of claims 1 to 11; and A container system comprising a land area on the container opening for accommodating the sealing member, the land area comprising a polyester material.
  13. A laminate for forming a sealing member for sealing the rim of a container, wherein the laminate is, Induction heating layer; and A heat sealing laminate for bonding to the above-mentioned edge, wherein the heat sealing laminate comprises a first resin layer and a second resin layer, wherein the second resin layer is a heat sealing layer for bonding to the above-mentioned edge upon installation, and the first resin layer is an adhesion promoter for bonding the induction heating layer to the second resin layer, and A laminate, wherein the first resin layer comprises a copolymer of ethylene and acrylic acid, and the second resin layer comprises a modified ethylene acrylate resin.
  14. In claim 13, the laminate, wherein the second resin layer has a lower Vicat softening point than the first resin layer.
  15. A laminate according to claim 13, wherein the first resin layer has a melting point of 95 to 105 ℃ and the second resin layer has a melting point of 85 to 100 ℃.
  16. A laminate according to claim 13, wherein the ratio of the thickness of the first resin layer to the second resin layer is in the range of 1:1 to 28:7.
  17. In claim 13, the sealing member is a laminate lacking a polyester material.
  18. In claim 13, the heat sealing laminate is a laminate lacking a polyester material.
  19. A laminate according to claim 13, wherein the first resin layer comprises a first resin of 10 to 30 g/m² and the second resin layer comprises a second resin of 5 to 30 g/m².
  20. In claim 13, the heat seal laminate is a laminate having a thickness of 25 to 40 microns.

Description

heat sealing member Cross-reference regarding related applications This application claims the benefit of U.S. Provisional Application No. 62/976,661 filed on February 14, 2020, the entirety of which is incorporated herein by reference. Technology field The present disclosure relates to a sealing member for sealing the mouth of a container, and more specifically, to sealing members having a heat seal configured to reduce oversealing. It is often desirable to seal the opening of a container using a removable or peel-off seal, sealing member, or inner seal. Often, a cap or other stopper is screwed on or placed over the container opening to capture the sealing member within it. Upon use, the consumer typically removes the cap or other stopper to access the sealing member, and then removes or otherwise peels off the seal from the container to dispense or access the contents. Early attempts to seal container openings utilized induction-type or conduction-type internal seals covering the container opening; in this case, the seal was typically conformed to the shape of the opening so that the circular container opening was sealed with a circular disc approximately the same size as the opening. These prior art seals typically had a lower heat-activated sealing layer to secure the periphery of the seal to a rim or other upper surface surrounding the container opening. When the seal was exposed to heat, the lower layer adhered to the rim of the container. In many cases, these seals included a foil layer capable of generating induction heat to activate the lower heat-activated sealing layer. While these prior art seals tended to provide a good seal, they were often difficult for the consumer to remove because there was nothing for the consumer to grasp to remove the seal. Often, because there was little or no sealing material to grip, consumers had to pinch the edge of the seal with their fingernails. Other types of seals for containers include side tabs or other flanges that extend outward from the peripheral edge of the seal. These side tabs are typically not fixed to the container rim and provide a grasping surface that allows the consumer to grab and remove the seal. However, these side tabs extend across the side of the container rim and often protrude into the threaded portion of the stopper. If the side tab is too large, this configuration can negatively affect the seal's ability to form a good heat seal. The side tab (and often the seal itself) may deform or crumple when the stopper or other cap is placed in the container due to contact between the stopper (and its threads) and the tabbed part of the seal. To minimize this problem, the side tab is often very small; thus, it provides little surface area or material for the consumer to grasp in order to remove the seal. However, even in tabbed and tabless forms, problems caused by oversealing of the seal against the container still occur. For example, if oversealing occurs, the bond between the heat seal and the container through the sealant layer or heat seal layer may be too strong, and consequently, the desirable removal of the entire seal from the container may be hindered. In some forms, the seal may rupture, and consequently, parts of the seal may remain on the container. In tabbed forms, the seal may rupture near the pivot point of the tab. In some forms, approximately half of the seal surface area may be covered by the tab, and consequently, approximately half of the seal may remain adhered to the container. This remaining portion can be particularly difficult to remove if the easily graspable tab is not left on this remaining portion. Over-sealing can occur due to various factors. For example, heat sealing equipment and/or induction heating equipment may not be properly calibrated, and/or otherwise, may provide too much heat or pressure during seal installation or provide the appropriate heat or pressure over an excessively long period. This can result in excessive heat generation or, alternatively, the bond becoming too strong. Furthermore, over-sealing can be a particular problem with PET (polyethylene terephthalate) containers. When conventional heat seal layers/seals are used, these materials can form a particularly strong bond with the PET container. PET can be a particular problem because the PET within the seal and/or on the container can melt and expand through the heat seal. For example, if the seal contains PET, such as a support layer behind the heat seal, the PET can melt and flow through the heat seal and consequently weld to the PET container. This can make the removal of the seal particularly difficult and also make it more susceptible to over-sealing. Induction heat seals can also experience other problems. For example, many induction heat seals include membranes, such as aluminum or other metal-containing layers. Such layers can be used not only to provide heat during induction sealing but also to provide barrier functions, such as mois