US5178293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Easily-openable packaging container
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1991-08-07
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Granted: 1993-01-12
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Expires: 2011-08-07
Abstract
Abstract 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.
Inventors
- 👤 Takanori Suzuki
- 👤 Yukio Takata
- 👤 Takeshi Shinohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:47
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/06; B65; B65D; B65D2577/00; B65D2577/10; B65D2577/20; B65D2577/2025; B65D2577/2033; B65D2577/2041; B65D2577/205; B65D2577/2066; B65D2577/2075; B65D2577/2083
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
224 words
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; said multilayered structure including a layer forming an inner surface layer of the container portion and another layer contacting the inner surface layer and being laminated thereto; a notch extending into said inner surface layer and being located at an inner peripheral portion of said flange portion, said notch being positioned inwardly of at least a part of the planar portion so that upward peeling of the inner surface layer away from said another layer allows at least a part of the inner surface layer in the planar portion of the flange portion of said multilayer structure to be separated from the another layer; at least a part of the planar portion being adapted to be heat sealed to a lid member for the container and to form a bond with said lid member exhibiting a peel strength greater than the interlaminar strength of the inner surface layer and the another layer; the interlaminar strength between the inner surface layer and the another layer being from 200 to 1500 g/15 mm and the thickness of the inner surface layer at the flange portion being from 5 to 150 μm.
Claim 2
Dependent Claim
224 words
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; said multilayered structure including a layer forming an inner surface layer of the container portion and another layer contacting the inner surface layer and being laminated thereto; a notch extending into said inner surface layer and being located at an inner peripheral portion of said flange portion, said notch being positioned inwardly of at least a part of the planar portion so that upward peeling of the inner surface layer away from said another layer allows at least a part of the inner surface layer in the planar portion of the flange portion of said multilayer structure to be separated from the another layer; at least a part of the planar portion being adapted to be heat sealed to a lid member for the container and to form a bond with said lid member exhibiting a peel strength greater than the interlaminar strength of the inner surface layer and the another layer; the interlaminar strength between the inner surface layer and the another layer being from 200 to 1500 g/15 mm and the thickness of the inner surface layer at the flange portion being from 5 to 150 μm.
Claim 3
Dependent Claim
28 words
A multilayer container according to claim 1, wherein the inner surface layer is a layer of polyethylene and the another layer contacting thereto is a layer of polypropylene.
Claim 4
Dependent Claim
43 words
A container according to claim 1, wherein the multilayered structure of said inner surface layer and said another layer is a combination of (A) a resin mixture layer comprising a polypropylene base resin and a polyethylene base resin and (B) a polyethylene layer.
Claim 5
Dependent Claim
25 words
A container according to claim 3, wherein the weight ration between said polypropylene base resin and said polyethylene base resin is from 50:50 to 97:3.
Claim 6
Dependent Claim
16 words
A container according to claim 3, wherein said polyethylene layer (B) is a high density polyethylene.
Claim 7
Dependent Claim
34 words
A container according to claim 1, wherein said inner surface layer is a layer of a polyolefin resin and said another layer contacting to the inner surface layer is a layer of a metal.
Claim 8
Dependent Claim
122 words
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; said multilayer container comprising a multilayered structure including a layer forming the inner surface layer and another layer contacting thereto and the interlaminar strength between the inner surface layer and the layer contacting thereto being from 200 to 1500 g/15 mm, the thickness of the inner surface layer at the flange portion being from 5 to 150 μm.
Claim 9
Dependent Claim
122 words
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; said multilayer container comprising a multilayered structure including a layer forming the inner surface layer and another layer contacting thereto and the interlaminar strength between the inner surface layer and the layer contacting thereto being from 200 to 1500 g/15 mm, the thickness of the inner surface layer at the flange portion being from 5 to 150 μm.
Claim 10
Dependent Claim
18 words
An easily-openable packaging container according to claim 7, wherein the notch is formed by pressing the lid member.
Claim 11
Dependent Claim
46 words
An easily-openable packaging container according to claim 7, wherein the lid member consists of a multilayer film comprising a sealant layer and an outer layer and the sealant layer is made of the same material as that of the inner surface layer of the multilayer container.
Claim 12
Dependent Claim
27 words
An easily-openable package container according to claim 7, wherein the inner surface layer is a layer of polyethylene and the another layer is a layer of polypropylene.
Claim 13
Dependent Claim
134 words
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; the interlaminar strength between the inner surface layer and the another layer being from 200 to 1,500 g/15 mm, the thickness of the inner surface layer at the flange portion being from 5 to 150 μm, and the peeling strength between the inner surface layer of the flange portion and said lid at the sealed portion being greater than said interlaminar strength; and two notches provided in the inner surface layer of the flange portion of the multilayered container, said sealed portion being located between said two notches.
Claim 14
Dependent Claim
134 words
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; the interlaminar strength between the inner surface layer and the another layer being from 200 to 1,500 g/15 mm, the thickness of the inner surface layer at the flange portion being from 5 to 150 μm, and the peeling strength between the inner surface layer of the flange portion and said lid at the sealed portion being greater than said interlaminar strength; and two notches provided in the inner surface layer of the flange portion of the multilayered container, said sealed portion being located between said two notches.
Claim 15
Dependent Claim
17 words
An easily-openable packaging container according to claim 11, wherein the notches are formed by pressing the lid.
Claim 16
Dependent Claim
45 words
An easily-openable packaging container according to claim 11, wherein the lid consists of a multilayer film comprising a sealant layer and an outer layer and the sealant layer is made of the same material as that of the inner surface layer of the multilayered container.
Claim 17
Dependent Claim
27 words
An easily-openable packaging container according to claim 11, wherein the inner surface layer is a layer of polyethylene and said another layer is a layer of polypropylene.
Claim 18
Dependent Claim
26 words
An easily-openable packaging container according to claim 11, wherein the thickness of the inner surface layer at the flange portion is from 10 to 100 μm.
Claim 19
Dependent Claim
45 words
A container according to claim 7 or 11, wherein the multilayer structure of said inner surface layer and said another layer is a combination of (A) a resin mixture layer comprising a polypropylene base resin and a polyethylene base resin and (B) a polyethylene layer.
Claim 20
Dependent Claim
25 words
A container according to claim 16, wherein the weight ratio between said polypropylene base resin and said polyethylene base resin is from 50:50 to 97:3.
Claim 21
Dependent Claim
16 words
A container according to claim 16, wherein said polyethylene layer (B) is a high density polyethylene.
Claim 22
Dependent Claim
35 words
A container according to claim 7 or 11, wherein said inner surface layer is a layer of a polyolefin resin and said another layer contacting the inner surface layer is a layer of a metal.
Claim 23
Dependent Claim
147 words
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; the interlaminar strength between the inner surface layer and the another layer is from 200 to 1,500 g/15 mm, the thickness of the inner surface layer at the flange portion is from 5 to 150 μm, and the peeling strength between the lid and the inner surface layer of the multilayered container at the flange portion is greater than said interlaminar strength; and characterized in that said multilayered container and said lid are sealed with a larger sealing pressure at least at an innermost portion of a sealed portion of the flange portion than at the rest of the sealed portion.
Claim 24
Dependent Claim
147 words
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; the interlaminar strength between the inner surface layer and the another layer is from 200 to 1,500 g/15 mm, the thickness of the inner surface layer at the flange portion is from 5 to 150 μm, and the peeling strength between the lid and the inner surface layer of the multilayered container at the flange portion is greater than said interlaminar strength; and characterized in that said multilayered container and said lid are sealed with a larger sealing pressure at least at an innermost portion of a sealed portion of the flange portion than at the rest of the sealed portion.
Claim 25
Dependent Claim
26 words
An easily-openable packaging container according to claim 20, wherein the thickness of the inner surface layer at the flange portion is from 10 to 100 μm.
Claim 26
Dependent Claim
17 words
An easily-openable packaging container according to claim 20, wherein the inner surface layer comprises a sealing layer.
Claim 27
Dependent Claim
149 words
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; the interlaminar strength between the inner surface layer and the another layer is from 200 to 1,500 g/15 mm, the thickness of the inner surface layer at the flange portion is from 5 to 150 μm, and the peeling strength between the lid and the inner surface layer of the multilayered container at the flange portion is greater than said interlaminar strength; and characterized in that said multilayered container and said lid are pressed together during sealing with a larger pressure at least at an inner peripheral portion of said flange portion than at an outer peripheral portion of the flange portion.
Claim 28
Dependent Claim
149 words
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; the interlaminar strength between the inner surface layer and the another layer is from 200 to 1,500 g/15 mm, the thickness of the inner surface layer at the flange portion is from 5 to 150 μm, and the peeling strength between the lid and the inner surface layer of the multilayered container at the flange portion is greater than said interlaminar strength; and characterized in that said multilayered container and said lid are pressed together during sealing with a larger pressure at least at an inner peripheral portion of said flange portion than at an outer peripheral portion of the flange portion.
Claim 29
Dependent Claim
26 words
An easily-sealable packaging container according to claim 23, wherein the thickness of the inner surface layer at the flange portion is from 10 to 100 μm.
Claim 30
Dependent Claim
17 words
An easily-openable packaging container according to claim 23, wherein the inner surface layer is a sealing layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-01-12 | 1996-07-13 | 1997-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-12 | 2000-07-13 | 2001-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-12 | 2004-07-13 | 2005-01-12 | $7700.00 | Window Closed / Lapsed |