CA2137146C - Anti-bulging container - Google Patents
Anti-bulging containerInfo
- Publication number
- CA2137146C CA2137146C CA002137146A CA2137146A CA2137146C CA 2137146 C CA2137146 C CA 2137146C CA 002137146 A CA002137146 A CA 002137146A CA 2137146 A CA2137146 A CA 2137146A CA 2137146 C CA2137146 C CA 2137146C
- Authority
- CA
- Canada
- Prior art keywords
- container
- base
- curve
- section
- container according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
- B65D1/0261—Bottom construction
- B65D1/0276—Bottom construction having a continuous contact surface, e.g. Champagne-type bottom
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Packages (AREA)
Abstract
The present invention is an anti-bulging container (1) comprising a side wall (2 ) and a base (3). In a cross section in a plane comprising the container's central vertical axis (A), the base (3) compris es a concave outwards curved section (4) connected to a side wall (2) followed by at least two stairs (6, 6') and a dome (8). Each stair (6, 6') consists of a straight part (5', 5) forming an angle (2', 2) with a plane perpendicular to the container's central vertical axis, followed by a sharp concave outward curve. The dome (8) consists of a smooth concave outward curve.
Description
-~093/Z4377 ~371~ PCT/U5~3/04580 ANTI BULGING CONTAINER
Field o~ the invention : .
The present invention relates to a:container of thermoplastic material for containing li~uids. The container is designed so as to resist bulging. ~ .
:
Back~round of the invention ..
~t is well known in the art to use thermoplastic materials to manufacture containers:for liquids. Some of the liquids to be contalned by such containers, for instance bleach-;containing compositions, create internal pressure which builds up with time. In such cases, the containers are progressively subjected to deformation due to the internal pressure build-up, especially at their base. This phenomenon is o~ten referred to as "bul~ing". This phenomenon is -' -especially acute in warm countries where the containers may be exposed to particularly elevated temperatur~s. In some instances, bulging can be so severe so as to induce a base deformation which is such that the container can no longer SlJE3STTrUrE SHEEr ~.,~.. ,~ ... . . . . . .
~Jl~7~.4~
WO93/2q377 PC~/~S93/04 ' :
stay in upright position. For instance in supermarkets, the containers may fall of the shelves.
:
Anti-bulging containers have been disclosed in the art, for instance in DE 16 07 895, DE 21 11 534, EP 0 002 082 and our co-pending European Application EP 91202524. These references disclose containers having a central dome, where the dome is connected to the side walls of the container by pieces of thermoplastic material of various shapes.
It is therefore an obiect of the present invention to provide a container of thermoplastic material for containing liquids with improved resistance to bu~ging.
It is also an object of the present invention to provide a solution to bulging which is particularly applicable to containers of smaller size.
The problem of bulging can to some extent be addressed by increasing the quantity of thermoplastic material used, so as to manufacture a container with thick walls. However, this solutiorl is quite objectionable from an environmental point of view as well as from an ea5e of manufacturing viewpoint.
It is therefore an another object of the present invention ~to provide a~ anti-bulging container of thermoplastic material having walls of minimum thickness.
Summarv of the invention The present invention is a container (1) of thermoplastic material comprising a side wall ~2) and a base ~3), said base comprising, in a cross section in a plane comprising the container's vertical aXis ~A), a concave inwards curved section (4) connected to the side wall (2), at least two successive stairs, each stair consisting of a straight part SUBSTlTU~ SHE~
. WO93J24377 ~ CT/US93/0458~
l,,~.-', ~'' (5,5l) forming an angle (~l,a2) with a plane (B) perpendicular to said axis (A), followed by a sharp concav~e outwards curve (6,6'~, and a dome (8) consisting of a smooth concave outwards curve. The base (3) of the container (1) is symmetrical about said axis (A).
, Detailed description of the invention The container according to the invention is made af a thermoplastic material. Such materials have been extensively described in the art and include vinyl chloride based resins, polymers and copolymers derived from olefins, acrylic polymers and copoly~ers, polyethylene, polypropylene, -.
polystyrene, polyethylene terephthalate, polyethylene ~erephthalate glycol, or mixtures thereof. The container can :-be made by single or multi layer extrusion of such materials.
It can also be made out of recycled thermoplastic materials. ;~
A preferred thermoplastic material for use herein is polyethylene. ~ .
The cross section of the container according to the present invention, and/or its base, in a plane perpendicular to the -.-con~ainer's vertical axis (A~, can be square or rectangular, ovoid or circular. Furthermore, the base (3) of the.
container according to the present invention is symmetrical about said axis (Aj. In a preferred embodiment of the J, ' invention, said cross section is circular. . The present invention is particularly suitable for containers of rather small size, i.e. where the container's largest dimension in said cross sectio~ is less than lOcm. - -The following description refers to fig 1 which represents the lower part of the container in a cross section in a plane comprising the container's central vertical axis (A). Fig 2 SU~STlfUTE SHEE~
,, .. . . . ~, .. , . . , . .. , . , .. . . . ~ . , .. . . , . . .. . . . .. . . ~ . .. .. . ...
. .
WO 93/24377 ~ PC~r/vs93/0458 .~ -- 4 --represents a scale up of the lower part of the container, on one side of (A).
The container (l) according to the present invention comprises a side wall (2) and a base (3~. The base (3) which is the gist of the present invention is connected to the s~de wall (2). The base (3) comprises a curved section (4), ~ollowed by at least two stairs (5/6,5'/6') and a dome (8).
The curved section (4) is connected at one extremity to the side wall(2)j and at the other extremity to at least two successive stairs. The curve of said curved section (4) is concave inwards, i.e. the interior of said curve faces the inside of the container.
Each stair comprises a straiyht part (5,5') followed by a sharp curve (6,6'). The straight parts (5,5') can be of same dimensions, but in a preferred embodiment, the straight part which is the closest to the periphery of the container is longer than straight part which is~closest to the center of thP container. Each straight part (5,5') forms an angle (al,~2) with a plane (B) perpendicular to the container's vertical.central axis (A). According to the present inverltion, al and a2 can be different, but in a preferred ~mbodiment of the invention ~1 and ~2 are the same. Each straight part (5,5') is connected to a sharp cuxve (6,6').
By sharp curv~, it is meant herein a curve who's radius is smaller than the radius of the curved section (4). said sharp curves (6,6') are concavP outwards, i.e. the interior of each sharp curve (6,6') faces the outside of the container. The radius of the sharp curves ~6,6') can be -:
identical, bu~ in a preferred embodiment, the radius of the sharp curve which is closest to the periphery of the container is larger than the radiu~ of the sharp curve which is closes~ to the ~enter of the container. In a preferred SUBSTITUTE SHEET
., .~.. .. . .. ... .. . .
.~093/24377 ;~ ~ ~ 7 ~ ~ ~ PCT/US93/04580 ~'~
.. . ..
embodiment of the present invention, the base (3) only comprise two stairs.
The sharp curve of the stair which is closest to the center of the container is connected to a dome (8). The dome (8) ~onsists of a smooth curve. Said smooth curve is concave ~
outwards, i~e. the interior of said curve faces the outside ~.
of the container. By smooth curve, it is meant herein a curve who's radius is larger than the radius of both curved sections (6,6'). .
:
The present invention ls further illustrated by the following example.
ExamPle ::
cy~indrical container according to the present invention is.-madP out of polyethylene. It has a diameter of 90mm. The .:
radius of the curved section (4j is 5.5mm. The length of the; -straight part ~5) measured along plane (B) is 11.5 mm. The -~
radius of the sharp curve (6~ is 3~m. The length of the --straight part (5'~ measured along pla-ne (B) is 4.65mm. The radius of the sharp curve (6') is 2mm. Finally, the radius of the dome is 9Omm. The thickness of the thermoplastic material used for this embodiment is 1.5mm throughout the container.
SUBSTlTUTE SHEET
Field o~ the invention : .
The present invention relates to a:container of thermoplastic material for containing li~uids. The container is designed so as to resist bulging. ~ .
:
Back~round of the invention ..
~t is well known in the art to use thermoplastic materials to manufacture containers:for liquids. Some of the liquids to be contalned by such containers, for instance bleach-;containing compositions, create internal pressure which builds up with time. In such cases, the containers are progressively subjected to deformation due to the internal pressure build-up, especially at their base. This phenomenon is o~ten referred to as "bul~ing". This phenomenon is -' -especially acute in warm countries where the containers may be exposed to particularly elevated temperatur~s. In some instances, bulging can be so severe so as to induce a base deformation which is such that the container can no longer SlJE3STTrUrE SHEEr ~.,~.. ,~ ... . . . . . .
~Jl~7~.4~
WO93/2q377 PC~/~S93/04 ' :
stay in upright position. For instance in supermarkets, the containers may fall of the shelves.
:
Anti-bulging containers have been disclosed in the art, for instance in DE 16 07 895, DE 21 11 534, EP 0 002 082 and our co-pending European Application EP 91202524. These references disclose containers having a central dome, where the dome is connected to the side walls of the container by pieces of thermoplastic material of various shapes.
It is therefore an obiect of the present invention to provide a container of thermoplastic material for containing liquids with improved resistance to bu~ging.
It is also an object of the present invention to provide a solution to bulging which is particularly applicable to containers of smaller size.
The problem of bulging can to some extent be addressed by increasing the quantity of thermoplastic material used, so as to manufacture a container with thick walls. However, this solutiorl is quite objectionable from an environmental point of view as well as from an ea5e of manufacturing viewpoint.
It is therefore an another object of the present invention ~to provide a~ anti-bulging container of thermoplastic material having walls of minimum thickness.
Summarv of the invention The present invention is a container (1) of thermoplastic material comprising a side wall ~2) and a base ~3), said base comprising, in a cross section in a plane comprising the container's vertical aXis ~A), a concave inwards curved section (4) connected to the side wall (2), at least two successive stairs, each stair consisting of a straight part SUBSTlTU~ SHE~
. WO93J24377 ~ CT/US93/0458~
l,,~.-', ~'' (5,5l) forming an angle (~l,a2) with a plane (B) perpendicular to said axis (A), followed by a sharp concav~e outwards curve (6,6'~, and a dome (8) consisting of a smooth concave outwards curve. The base (3) of the container (1) is symmetrical about said axis (A).
, Detailed description of the invention The container according to the invention is made af a thermoplastic material. Such materials have been extensively described in the art and include vinyl chloride based resins, polymers and copolymers derived from olefins, acrylic polymers and copoly~ers, polyethylene, polypropylene, -.
polystyrene, polyethylene terephthalate, polyethylene ~erephthalate glycol, or mixtures thereof. The container can :-be made by single or multi layer extrusion of such materials.
It can also be made out of recycled thermoplastic materials. ;~
A preferred thermoplastic material for use herein is polyethylene. ~ .
The cross section of the container according to the present invention, and/or its base, in a plane perpendicular to the -.-con~ainer's vertical axis (A~, can be square or rectangular, ovoid or circular. Furthermore, the base (3) of the.
container according to the present invention is symmetrical about said axis (Aj. In a preferred embodiment of the J, ' invention, said cross section is circular. . The present invention is particularly suitable for containers of rather small size, i.e. where the container's largest dimension in said cross sectio~ is less than lOcm. - -The following description refers to fig 1 which represents the lower part of the container in a cross section in a plane comprising the container's central vertical axis (A). Fig 2 SU~STlfUTE SHEE~
,, .. . . . ~, .. , . . , . .. , . , .. . . . ~ . , .. . . , . . .. . . . .. . . ~ . .. .. . ...
. .
WO 93/24377 ~ PC~r/vs93/0458 .~ -- 4 --represents a scale up of the lower part of the container, on one side of (A).
The container (l) according to the present invention comprises a side wall (2) and a base (3~. The base (3) which is the gist of the present invention is connected to the s~de wall (2). The base (3) comprises a curved section (4), ~ollowed by at least two stairs (5/6,5'/6') and a dome (8).
The curved section (4) is connected at one extremity to the side wall(2)j and at the other extremity to at least two successive stairs. The curve of said curved section (4) is concave inwards, i.e. the interior of said curve faces the inside of the container.
Each stair comprises a straiyht part (5,5') followed by a sharp curve (6,6'). The straight parts (5,5') can be of same dimensions, but in a preferred embodiment, the straight part which is the closest to the periphery of the container is longer than straight part which is~closest to the center of thP container. Each straight part (5,5') forms an angle (al,~2) with a plane (B) perpendicular to the container's vertical.central axis (A). According to the present inverltion, al and a2 can be different, but in a preferred ~mbodiment of the invention ~1 and ~2 are the same. Each straight part (5,5') is connected to a sharp cuxve (6,6').
By sharp curv~, it is meant herein a curve who's radius is smaller than the radius of the curved section (4). said sharp curves (6,6') are concavP outwards, i.e. the interior of each sharp curve (6,6') faces the outside of the container. The radius of the sharp curves ~6,6') can be -:
identical, bu~ in a preferred embodiment, the radius of the sharp curve which is closest to the periphery of the container is larger than the radiu~ of the sharp curve which is closes~ to the ~enter of the container. In a preferred SUBSTITUTE SHEET
., .~.. .. . .. ... .. . .
.~093/24377 ;~ ~ ~ 7 ~ ~ ~ PCT/US93/04580 ~'~
.. . ..
embodiment of the present invention, the base (3) only comprise two stairs.
The sharp curve of the stair which is closest to the center of the container is connected to a dome (8). The dome (8) ~onsists of a smooth curve. Said smooth curve is concave ~
outwards, i~e. the interior of said curve faces the outside ~.
of the container. By smooth curve, it is meant herein a curve who's radius is larger than the radius of both curved sections (6,6'). .
:
The present invention ls further illustrated by the following example.
ExamPle ::
cy~indrical container according to the present invention is.-madP out of polyethylene. It has a diameter of 90mm. The .:
radius of the curved section (4j is 5.5mm. The length of the; -straight part ~5) measured along plane (B) is 11.5 mm. The -~
radius of the sharp curve (6~ is 3~m. The length of the --straight part (5'~ measured along pla-ne (B) is 4.65mm. The radius of the sharp curve (6') is 2mm. Finally, the radius of the dome is 9Omm. The thickness of the thermoplastic material used for this embodiment is 1.5mm throughout the container.
SUBSTlTUTE SHEET
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A container (1) of thermoplastic material comprising a side wall (2) and a base (3), said base comprising in a cross section in a plane comprising the container's vertical axis (A), a concave inwards curved section (4) connected to the side wall (2), at least two successive stairs, each stair consisting of a first and second straight part (5,5') formingan angle (.alpha.1, .alpha.2) with a plane (B) perpendicular to said axis (A), followed by a first and second sharp concave outwards curve (6,6'), and a dome (8) consisting of a smooth concave outwards curve, said base (3) being symmetrical about said axis (A).
2. A container according to claim 1 which has a larger dimension in a cross section in a plane perpendicular to the container's central vertical axis of less then about 10cm.
3. A container according to claim 1 which has a circular cross section in a plane perpendicular to the container's central vertical axis.
4. A container according to claim 1 comprising only two stairs.
5. A container according to claim 1 where .alpha.1 is equal to .alpha.2.
6. A container according to claim 1 wherein the first straight part (5) which isclosest to the periphery of the container is longer than the second straight part (5') which is closest to the center of the container.
7. A container according to claim 1 where the radius of the first sharp concave outwards curve (6) which is closest to the periphery of the container is larger than the radius of the second sharp concave outwards curve (6') which is closest to the center of the container.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP92201566A EP0572722B1 (en) | 1992-06-02 | 1992-06-02 | Anti-bulging container |
| EP92201566.4 | 1992-06-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2137146A1 CA2137146A1 (en) | 1993-12-09 |
| CA2137146C true CA2137146C (en) | 1998-09-22 |
Family
ID=8210643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002137146A Expired - Fee Related CA2137146C (en) | 1992-06-02 | 1993-05-13 | Anti-bulging container |
Country Status (13)
| Country | Link |
|---|---|
| EP (1) | EP0572722B1 (en) |
| JP (1) | JP2980684B2 (en) |
| AT (1) | ATE148668T1 (en) |
| BR (1) | BR9306481A (en) |
| CA (1) | CA2137146C (en) |
| DE (1) | DE69217358T2 (en) |
| DK (1) | DK0572722T3 (en) |
| ES (1) | ES2097268T3 (en) |
| GR (1) | GR3022504T3 (en) |
| IE (1) | IE930416A1 (en) |
| MA (1) | MA22899A1 (en) |
| TR (1) | TR27426A (en) |
| WO (1) | WO1993024377A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2717443B1 (en) * | 1994-03-16 | 1996-04-19 | Evian Eaux Min | Plastic molded bottle. |
| DE69523903T2 (en) | 1995-06-26 | 2002-06-06 | Procter & Gamble | liquid container |
| US9150320B2 (en) | 2011-08-15 | 2015-10-06 | Graham Packaging Company, L.P. | Plastic containers having base configurations with up-stand walls having a plurality of rings, and systems, methods, and base molds thereof |
| FR2998877B1 (en) * | 2012-11-30 | 2014-12-26 | Sidel Participations | CONTAINER HAVING BACKGROUND PROVIDED WITH A DOUBLE-BREAKDOWN VOUTE |
| EP2764967B1 (en) | 2013-02-06 | 2015-10-14 | Sidel Participations | Mold for blow molding a hot-fill container with increased stretch ratios |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3409167A (en) * | 1967-03-24 | 1968-11-05 | American Can Co | Container with flexible bottom |
| US4120419A (en) * | 1976-02-23 | 1978-10-17 | National Steel Corporation | High strength seamless chime can body, sheet metal container for vacuum packs, and manufacture |
| US4177746A (en) * | 1976-07-29 | 1979-12-11 | Reynolds Metals Company | Method of forming a container |
| JPS5325186A (en) * | 1976-08-20 | 1978-03-08 | Daiwa Can Co Ltd | Metallic can for drink containing carbon dioxide or the like |
| FR2382373A1 (en) * | 1977-03-02 | 1978-09-29 | Solvay | HOLLOW BODY IN THERMOPLASTIC MATERIAL |
| FR2429157A1 (en) * | 1978-06-21 | 1980-01-18 | Carnaud Total Interplastic | Blow moulded containers featuring a radiused impression in the base - to enhance local orientation and drop impact test resistance |
| US4197954A (en) * | 1978-10-05 | 1980-04-15 | Ethyl Development Corporation | Container |
| FR2448480A1 (en) * | 1979-02-07 | 1980-09-05 | Solvay | HOLLOW BODY IN ORIENTED THERMOPLASTIC MATERIAL |
| US4408698A (en) * | 1980-11-24 | 1983-10-11 | Ballester Jose F | Novel cover and container assembly |
| US4542029A (en) * | 1981-06-19 | 1985-09-17 | American Can Company | Hot filled container |
-
1992
- 1992-06-02 AT AT92201566T patent/ATE148668T1/en not_active IP Right Cessation
- 1992-06-02 DK DK92201566.4T patent/DK0572722T3/en active
- 1992-06-02 DE DE69217358T patent/DE69217358T2/en not_active Expired - Fee Related
- 1992-06-02 EP EP92201566A patent/EP0572722B1/en not_active Expired - Lifetime
- 1992-06-02 ES ES92201566T patent/ES2097268T3/en not_active Expired - Lifetime
-
1993
- 1993-05-13 BR BR9306481A patent/BR9306481A/en unknown
- 1993-05-13 JP JP6500580A patent/JP2980684B2/en not_active Expired - Fee Related
- 1993-05-13 CA CA002137146A patent/CA2137146C/en not_active Expired - Fee Related
- 1993-05-13 WO PCT/US1993/004580 patent/WO1993024377A1/en active Application Filing
- 1993-05-24 TR TR00416/93A patent/TR27426A/en unknown
- 1993-05-28 MA MA23198A patent/MA22899A1/en unknown
- 1993-06-01 IE IE041693A patent/IE930416A1/en not_active Application Discontinuation
-
1997
- 1997-02-06 GR GR970400199T patent/GR3022504T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CA2137146A1 (en) | 1993-12-09 |
| TR27426A (en) | 1995-04-21 |
| MA22899A1 (en) | 1993-12-31 |
| DE69217358D1 (en) | 1997-03-20 |
| DK0572722T3 (en) | 1997-04-01 |
| EP0572722B1 (en) | 1997-02-05 |
| BR9306481A (en) | 1998-09-15 |
| WO1993024377A1 (en) | 1993-12-09 |
| ATE148668T1 (en) | 1997-02-15 |
| DE69217358T2 (en) | 1997-06-26 |
| IE930416A1 (en) | 1993-12-15 |
| ES2097268T3 (en) | 1997-04-01 |
| EP0572722A1 (en) | 1993-12-08 |
| JPH07507259A (en) | 1995-08-10 |
| JP2980684B2 (en) | 1999-11-22 |
| GR3022504T3 (en) | 1997-05-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |