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Easy-open container and closure assembly therefor

Inactive Publication Date: 2005-05-26
SONOCO DEV INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0006] It has been discovered that a higher acid content of the heat-seal material promotes such bond-strengthening with age (referred to as the “age-up” phenomenon). The invention addresses this problem by providing a heat-seal material comprising a blend of two different acidic ionomers of respectively higher and lower acid content such that the resulting blend has an intermediate acid content. In one embodimen

Problems solved by technology

However, the bond tends to become stronger with aging, to the point that it can become very difficult for the consumer to remove the membrane closure from the metal end.

Method used

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  • Easy-open container and closure assembly therefor
  • Easy-open container and closure assembly therefor

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Embodiment Construction

[0015] The present inventions now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. Indeed, these inventions may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like numbers refer to like elements throughout.

[0016] A container 10 in accordance with one embodiment of the invention is depicted in FIGS. 1-4. The container includes a container body 100 that can have various constructions. Typically the container will include a generally tubular or conical side wall 12 whose upper end defines a top opening of the container. The side wall 12 can be formed of various materials, including but not limited to plastic (e.g., the container body can be thermoformed or blow-molded from polymer material(s)) or composite (e.g., ...

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Abstract

A container comprises a container body defining a top opening, a sealing surface being defined on the container body encircling the top opening, and a closure sealed to the sealing surface by a heat-seal material comprising a blend of two different acidic ionomers having respectively higher and lower acid content such that the heat-seal material has an acid content intermediate between that of the two different ionomers, whereby the resulting heat seal strikes a balance between oil-resistance and age-up.

Description

BACKGROUND OF THE INVENTION [0001] 1. Technical Field [0002] The invention relates generally to easy-open containers for consumer products, wherein the container is sealed closed by heat-sealing a flexible membrane closure to a metal end, flange, or rim that encircles the top opening of the container. The invention more particularly relates to such a container employing a heat-seal material composed of an acidic ionomer. [0003] 2. Description of Related Art [0004] There is a class of easy-open product containers that are sealed closed by heat-sealing a membrane closure to a metal end or to a flange or rim that encircles the open top of the container. Such containers, for example, are marketed under the ULTRASEAL® trademark for containing various food products. In the case of containers having a metal end, the metal end generally comprises tin-plate steel, and its upper surface is coated with a heat-seal material The metal end is double-seamed to a flange formed on the container. The...

Claims

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Application Information

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IPC IPC(8): B32B27/06B65D53/00B65D17/50B65D51/20B65D77/20C08L23/00C08L23/08
CPCB32B27/06B65D17/502B65D51/20B65D77/2032B65D2517/0013B65D2517/0062B65D2517/0082C08L2205/02B65D2517/5013B65D2517/5029B65D2517/5083C08L23/0876C08L2666/06B32B2439/00B32B7/12
Inventor VARADARAJAN, KRISHNARAJU
Owner SONOCO DEV INC
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