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US 5,178,293 AGranted
Easily-openable packaging container
AssigneeIdemitsu Petrochemical Co., Ltd.
InventorsTakanori Suzuki, Yukio Takata, Takeshi Shinohara
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AssigneeIdemitsu Petrochemical Co., Ltd.
InventorsTakanori Suzuki, Yukio Takata, Takeshi Shinohara
Estimating the term…
A multilayer container having a flange portion and an easily-openable packaging container packaged by using the multilayer container, wherein the interlaminar strength of the multilayer container is smaller than the peeling strength between the flange portion and the lid member, and a ring notch is provided to an inner surface layer of the flange portion inside a heat seal portion. The packaging container has both a good sealing property and an easy openability and has an excellent resistance to boiling and a retort treatment, and peeled surface has a good appearance. A method for producing the multilayer container and a method for producing the packaging container, and an apparatus to be used for producing the multilayer container, and a method for filling and packaging, and an apparatus for filling and packaging are disclosed.
A multilayer container comprising a multilayered structure shaped to define a container portion having an opening and a flange portion surrounding the opening, said flange portion including a planar portion arranged adjacent to said opening;
An easily-openable packaging container comprising a multilayer container having a flange portion and a lid member heat sealed at the flange portion, in which the interlaminar strength of said multilayer container is smaller than the peeling strength between said flange portion and said lid member, and a ring notch is provided to an inner surface layer of the flange portion inside a heat-seal portion;
An easily-openable packaging container comprising a lid and multilayered container having an inner surface layer laminated to another layer, said multilayered container having a flange portion, said lid being sealed to the inner surface layer at a part of the flange portion of the multi-layered container;
An easily-openable packaging container comprising a lid and multilayered container having an inner surface layer laminated to another layer, said multilayered container having a flange portion, said lid being sealed to the inner surface layer at a part of the flange portion of a multilayered container;
An easily-openable packaging container comprising a lid and a multilayered container having an inner surface layer laminated to another layer, said multilayered container having a flange portion, said lid being sealed to the inner surface layer at a part of the flange portion of a multilayered container;
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Interconnection of layers: permitting easy separation
Multi-layered container, e.g. laminated, coated: with one or more layers of container being torn off upon initial opening
Pull tabs: integral with the closure
By applying separate lids or covers: means on, or attached to, container flange facilitating opening, e.g. non-bonding region, cut-out
Term ended 12 Jan 2010 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to a multilayer container and a method for producing the multilayer container, an easily-openable packaging container packaged by using the multilayer container, a method for packaging an article by using the multilayer container, and an apparatus for packaging an article (e.g. foods and drinks). More precisely, the present invention relates to a multilayer container suitable for heat sterilization packaging, which makes the setting of the heat sealing condition at heat sealing of a lid member easy. This invention is able to make a package which has not only an excellent sealing property but also easy openability and which can be opened with a stable opening force, a method and an apparatus for easily producing the multilayer container, an easily-openable packaging container packaged by using the above-mentioned multilayer container which provides a peeled surface having a good appearance and has an excellent resistance to boiling and retort treatment, a method for packaging, and an apparatus for packaging easily.
2. Description of the Prior Art
FIG. 1 is a sectional view showing a structure of a multilayer container of an embodiment according to the present invention.
FIG. 2 is a sectional view of a container in which the multilayer container shown in FIG. 1 is heat sealed with a lid member.
FIG. 3 is a sectional view of a multilayer container of another embodiment of the present invention.
FIG. 1 is a sectional view of a multilayer container of an embodiment according the present invention. A reference numeral 1 represents an inner surface layer of the multilayer container, a reference numeral 2 represents a layer contacting thereto, and a reference numeral 3 represents a notch formed at the inner peripheral portion of a flange portion. A reference numeral 4 represents a flange portion, which is to be used for heat-sealing the inner surface layer 1 of the multilayer container and a lid member after an article is filled and a lid member is covered.
The shape of the multilayer container of the present invention is not critical, and it is usually circular, square, and so forth, and the multilayer container is heat-sealed circularly along a flange portion of the shape. Also, the multilayer container may be cup-shaped or tray-shaped.
Referring to the multilayer structure of the multilayer container, it is not critical so long as the interlaminer strength of the multilayer container is smaller than the heat seal strength of a lid member and the multilayer container so that delamination occurs between the layers of the multilayer container at peeling of the lid member, and the lid mumber can be easily opened. The preferable interlaminer strength of the multilayer container is from 200 to 1500 g/15 mm, more preferably from 300 to 1200 g/15 mm (tensile speed: 300 mm/min). Further, the thickness of the inner surface layer at the flange portion is usually from 5 to 150 .mu.m, preferably from 10 to 100 .mu.m.