Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1990-03-16
1992-05-26
Seidleck, James J.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
220359, 220457, 428 358, 428 3692, 428344, 428399, B65D 4100
Patent
active
051166518
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Background
The present invention relates to an easy-open sealed packaging vessel. More particularly, the present invention relates to an easy-open sealed packaging vessel having a pressure-resistant performance capable of resisting a sterilization treatment such as retort sterilization and an easy openability in combination.
2. Description of the Prior Art
A vessel comprising a flanged vessel proper obtained by draw-forming of a metal foil sheet and a lid heat sealed to the vessel proper through the flange portion and a vessel comprising a flanged vessel proper having at least an inner surface formed of a resin and a lid formed of a metal foil sheet having an inner face of a resin, which is heat-sealed to the vessel proper through the flange portion, are widely used in the field of packaging of foods.
An inner face-covering layer of a paint or the like is formed on a metal foil sheet for such vessels or lids so as to prevent direct contact between the metal and content and protect the metal, and an inner face material composed of an olefin resin is formed on the inner face of a mating member for the purpose of heat sealing.
As the means for increasing the adhesion between a coating and an olefin resin, a method in which an acid-modified olefin resin is incorporated into the coating and the acid-modified olefin resin is predominantly distributed in the surface portion of the coating to improve the heat adhesiveness between the coating and olefin resin has already been known from Japanese Examined Patent Publication No. 58-2825.
This conventional technique is advantageous in that a strong adhesion can be attained between the coating and the olefin resin layer, but this conventional technique involves a problem in that the heat seal strength is too high for a so-called peelable sealed vessel where the heat sealed interface between the lid and the flange is peeled by hands for opening.
As means for solving this problem, Japanese Examined Patent Publication No. 58-385 proposes a structure of a plurality of coatings in which peeling is effected between the coatings, and Japanese Examined Patent Publication No. 56-22699 proposes a method in which the distribution of the acid-modified olefin resin in the coating is controlled by a distribution-controlling layer disposed below the coating. However, these proposals are defective in that the coating operation should be performed in two stages.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide an easy-open sealed packaging vessel which has a sealing performance or pressure-resistant performance capable of resisting a sterilization treatment such as retort sterilization and an easy openability in combination, in which an easy peeling performance is attained between an acid-modified olefin-containing coating and an inner face material composed of an olefin resin.
Another object of the present invention is to provide an easy-open sealed packaging vessel in which the peel strength in the heat-sealed interface can be adjusted easily and assuredly by adjusting the composition of an acid-modified olefin resin coating and/or the composition of an inner face material of an olefin resin.
Still another object of the present invention is to provide an easy-open sealed packaging vessel comprising a flanged vessel proper prepared by draw-forming of a coated metal foil sheet and a lid of a metal foil substrate having an inner face material composed of a polyolefin resin, in which opening in the heat-sealed portion can be easily accomplished.
A further object of the present invention is to provide a retortable packaging vessel, in which at least the inner face side of a vessel proper is composed of a polyolefin, a lid is composed of a metal foil sheet having a coating formed on the inner face side thereof, the heat-sealed portion formed between the vessel proper and the lid has a sealing performance capable of resisting the retort sterilization and enduring the subsequent storage, and at the opening operation, t
REFERENCES:
patent: 4596861 (1986-06-01), Sheih et al.
patent: 4656068 (1987-04-01), Raines
patent: 4722982 (1988-02-01), Tawaka
patent: 4766018 (1988-08-01), Hinrichsen et al.
Katsura Tadahiko
Matsuoka Kikuo
Miyake Kazuo
Taira Kazuo
Ueno Hiroshi
Seidleck James J.
Toyo Seikan Kaisha Ltd.
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