EP0967157A1 - Halbdurchlässiger Entgasungsverschluss - Google Patents

Halbdurchlässiger Entgasungsverschluss Download PDF

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Publication number
EP0967157A1
EP0967157A1 EP98116531A EP98116531A EP0967157A1 EP 0967157 A1 EP0967157 A1 EP 0967157A1 EP 98116531 A EP98116531 A EP 98116531A EP 98116531 A EP98116531 A EP 98116531A EP 0967157 A1 EP0967157 A1 EP 0967157A1
Authority
EP
European Patent Office
Prior art keywords
liquid
cavity
passage
venting cap
absorbing mass
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.)
Withdrawn
Application number
EP98116531A
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English (en)
French (fr)
Inventor
Jannis Pagidas
Efstathios Koklas
Alexis Stassinopoulos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ARGO SA
Original Assignee
ARGO SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ARGO SA filed Critical ARGO SA
Publication of EP0967157A1 publication Critical patent/EP0967157A1/de
Withdrawn legal-status Critical Current

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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
    • B65D51/00—Closures not otherwise provided for
    • B65D51/16—Closures not otherwise provided for with means for venting air or gas
    • B65D51/1605—Closures not otherwise provided for with means for venting air or gas whereby the interior of the container is maintained in permanent gaseous communication with the exterior
    • B65D51/1616—Closures not otherwise provided for with means for venting air or gas whereby the interior of the container is maintained in permanent gaseous communication with the exterior by means of a filter

Definitions

  • the present invention relates to a semipermeable venting cap according to the preamble of the independent claim. It permits the selective passage of gases but not of the liquids, suitable to seal plastic bottles, containing liquids which could create positive or negative pressure by producing gaseous products or by absorbing air from the headspace, and to compensate pressure differences. Examples of such liquids are housecleaning and sanitation solutions, cosmetics, biochemicals, agrochemicals, beverages and liquid food products. The creation of positive or negative pressure in the plastic container causes unwanted deformation of the container.
  • Venting caps must be able to function properly in a wide spun of end uses and storage and transportation conditions. For a wide group of consumer packages the following major prerequisites are required: (a) The caps must vent air at low pressure difference built-up. (b) They must not permit liquid exit even at high pressure built-up in the container. (c) They must retain these properties in the most extreme conditions of transportation and storage. (d) Their cost of production must be low and the materials and parts required for their manufacturing must be readily available. From the evaluation of vented cap technology available at present it was found that in all cases the vented caps proposed or offered in the market do not conform sufficiently to one or more of the above prerequisites.
  • caps containing an outlet covered by an elastic membrane with a thin split which would permit the exit of gas above certain pressure but impermeable to the liquid contents.
  • Such caps are described in EP-0 555 623 GB-1 534 570, US-5,143,236 (L'Oreal), US-4,896,789 and Greek patent application 96011443.
  • the drawback of such caps is the lack of complete selectivity in permitting the exit of gas but not of the liquid. Normally one can see liquid bubbles coming out of such caps during storage. It has been found in our experiments that the size and shape of the slit, the geometry of the elastic membrane, and the characteristics of the elastic material of the membrane are so critical that even the slightest deviation creates this non selectivity problem.
  • caps containing an inside elastic sealing disc seated on a ribbed or grooved non flat surface on the underside of the cap.
  • a gas under pressure inside the bottle deforms the elastic disc and escapes through the openings created between the deformed disc and the non flat surface of the cap (US-5,242,069 (Henkel), DE-3 611 089 (Henkel), WO 94/13549 (Wazel), EP-0 241 780 (Henkel), US-5,457,943 (Hertramf)).
  • the main drawback in such caps in addition to their non-selectivity, is the fact that very high pressure differences are required to deform the disc (200 mbar or more). At such high pressures the plastic bottle is already deformed before the escape of gas.
  • the aim of the present invention is to overcome the above limitations of the up to now existing venting caps.
  • the aim is solved by the invention as defined in the independent claims.
  • the herein disclosed cap is designed to permit gas escape from the contents to the environment and vice versa at very low pressure differences, even when the cap is wet. In the same time the cap is not permeable to liquid even at high pressure differences.
  • the distinguished characteristic of the venting cap described in the present invention is the foolproof selective permeation of gas but not of liquid.
  • the venting properties of such a cap remain unaltered even at extreme conditions of transportation and storage.
  • This selective permeation is achieved by forcing the fluid contents, liquid or gas, to pass through a swellable liquid-absorbing mass preferably made of polymeric matrix before finding an outlet to the outside environment. No liquid is permitted to pass through this polymeric matrix after its expansion by absorption of water, contrary to the free passage of gas.
  • the selective free passage of gas is further improved by the inclusion of granules of a porous material in the swollen polymeric mass.
  • the venting cap comprises a cavity, at least one first passage for fluids connecting the cavity with the inside of the container, at least one second passage for fluids connecting the cavity with the outside of the container, and a liquid-absorbing mass arranged within the cavity.
  • the liquid-absorbing mass acts, after absorption of liquid, as a selective filter prohibiting the passage of liquid, but permits the passage of gas.
  • Figure 1 shows a preferred embodiment of a semipermeable venting cap 1 according to the invention.
  • the cap 1 is preferably made of polypropylene or other thermoplastic or thermo set materials.
  • An inside 11 of the cap 1 comprises at least one narrow venting channel 5.1, 5.2 restricting the passage of liquid; such venting channels 5.1, 5.2 may also form a network.
  • the inside 11 of the cap 1 is designed to form a cavity 7 for storing a liquid-absorbing mass 8 (see Fig. 2) and the fastening of an undercap 3.
  • the cavity 7 is formed by a cylindrical ring 12 connected to the cap 1, and the undercap 3 is fitted over the ring 12.
  • the undercap 3 is preferably made of low-density PE or other flexible material.
  • venting hole 4 with a diameter in the range of 0.1 to 1.5 mm which is small enough to slow down the passage of liquid contents.
  • a cut or slot or a slot having a length in the range of 2 to 10 mm and a width in the range of width 0.01 to 0.2 mm would also be suitable to serve as the venting hole 4.
  • a sealing ring 6 is incorporated to create air-tight sealing between the cap 2 and a container 9 (see Fig. 4).
  • FIG. 2 shows the venting cap 1 in a front view.
  • the cavity 7 is filled with the liquid-absorbing mass 8, e.g., water-absorbing polymeric granules.
  • the undercap 3 acts as a cover which prevents the water-absorbing granules 8 from falling out of the cavity 7.
  • the narrow venting channels 5.1, 5.2 are arranged in such a manner that the adjustment of pressure difference by gas flow is supported and the flow of liquid is restricted.
  • the cavity 7 can also be arranged in a different way but it is preferably located in a place where normally it is surrounded by gas.
  • the venting cap 1 permits therefore the selective passage of gases but not of liquids.
  • the water-absorbing granules 8 in the cavity 7 act as a selective filter prohibiting the passage of liquid, but permitting the passage of gas.
  • the following swellable polymers are preferred as liquid absorbing polymeric mass: Crosslinked acrylic acid polymers and copolymers polymerized in organic solvents. Other carboxylic acids and salts used to create such polymers are metacrylic acid, malcic acid and itaconic acid. To improve the rate of water absorbency, these acrylic acid polymers can be polymerized in presence of dispersed nitrogen or CO 2 so that polymer porous particles are formed.
  • the liquid-absorbing mass 8 in the cavity 7 preferably has a bulk volume of 5-70 % of the volume of the cavity 7.
  • an inert organic or inorganic porous material can be included in the cavity 7.
  • This porous material with a open surface structure creates a continuous network of channels, when in contact to each other.
  • the ensuring of free passage of gas is guaranteed.
  • porous materials Aluminosilicate molecular sieve with a preferred bulk density of 750 kg/m 3 , a bead size of 95 % between 1 and 0.5 mm and an average pore size of 3 ⁇ m; Porous polyolefin with a preferred bulk density of 300 kg/m 3 , a bead size of 1-3 mm, a porosity of > 50 vol% and an average pore size of 3 ⁇ m.
  • FIG. 3 shows the venting cap 1 in a top view.
  • the hidden edges are dashed.
  • the narrow venting channels 5.1, 5.2 connect the cavity 7 with the outer environment of the cap 1.
  • the narrow channels 5.1, 5.2 are arranged in a way that their existence is not visible from the outside, which may be an advantage due to design reasons.
  • the narrow venting channels 5.1, 5.2 can also be arranged in a different way or have a different design than in the embodiment of Fig. 1. They are optimized as to the liquid stored in the container closed by the cap 1. If more gas has to be transferred, they are designed wider. It is also possible that the narrow channels 5.1, 5.2 are temporarily sealed, if this is necessary. For certain high-quality beverages it is an advantage if they are completely sealed during a certain period. Young wines in bottles as an example need a cap which allows to equalize pressure differences during storing because of gas production.
  • the narrow channels 5.1, 5.2 in a combination with the water-absorbing granules 8 can be designed to guarantee optimal
  • FIGs 4-6 explain the operation of the invention.
  • a container 9 is filled with a liquid product 10 (e.g., a disinfectant solution of hydrogen peroxide) and capped with the venting cap 1.
  • a liquid product 10 e.g., a disinfectant solution of hydrogen peroxide
  • an opening 5 has the same function as the narrow channels 5.1, 5.2 of Figs. 1 and 2.
  • the liquid 10 starts slowly entering into the cavity 7 through the small opening 4 of the undercap 3. This is displayed by an arrow P.
  • the first small quantity of water solution entering the cavity 7 between cap 2 and undercap 3 swells the granules 8 of polymer, creating a mass which fills the cavity 7. This is displayed in Figs.
  • a container 9 is filled with a hot liquid 10 e.g., a hot sauce, and capped with a venting cap 1.
  • a hot liquid 10 e.g., a hot sauce
  • a venting cap 1 With a normal sealing cap (not shown in detail) the walls of the bottle will be deformed after cooling.
  • the use of the venting cap 1 according to the invention will create equalization of outside and inside pressures by permitting air to enter the bottle 9. In case that the bottle is stored side-down, the cap becomes liquid-tight due to the mechanism described in the previous example.
  • venting cap 1 with already swollen water-absorbing granules 8.
  • a bottle 9 is filled, for an example, with an agrochemical product in organic solvent, e.g., xylene.
  • the liquid-absorbing mass 8 absorbs only water but not xylene, this embodiment would not work.
  • the problem is solved by using the venting cap 1 with pre-swollen water-absorbing granules 8. This is achieved by adding to the cavity 7 of the cap 1 the proper amount of water together with the swollen water-absorbing granules 8 before fastening the undercap 3 to the ring 12.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
EP98116531A 1998-06-25 1998-09-01 Halbdurchlässiger Entgasungsverschluss Withdrawn EP0967157A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GR980200103U GR2002256Y (en) 1998-06-25 1998-06-25 Liquid-impermeable and air-permeable caps
GR98200103 1998-06-25

Publications (1)

Publication Number Publication Date
EP0967157A1 true EP0967157A1 (de) 1999-12-29

Family

ID=10943631

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98116531A Withdrawn EP0967157A1 (de) 1998-06-25 1998-09-01 Halbdurchlässiger Entgasungsverschluss

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EP (1) EP0967157A1 (de)
GR (1) GR2002256Y (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3023204A1 (de) * 2014-11-21 2016-05-25 HILTI Aktiengesellschaft Handwerkzeuggetriebeverschluss und Handwerkzeugmaschine
CN117602236A (zh) * 2023-11-22 2024-02-27 中稀(广西)金源稀土新材料有限公司 一种存稀土罐体排气防倒入方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805991A (en) * 1967-09-11 1974-04-23 G Cheladze Lid construction with non-leak vent
EP0110046A1 (de) * 1982-11-30 1984-06-13 Rhein-Conti Kunststoff-Technik GmbH Gasdurchlässiger Gefässverschluss
EP0382146A1 (de) * 1989-02-06 1990-08-16 Unilever N.V. Behälterverschluss mit Innendruckbegrenzer
EP0382896A1 (de) * 1989-01-31 1990-08-22 Tecumseh Products Company Brennstoffkappe mit Spritzschutz
EP0519168A1 (de) * 1991-06-17 1992-12-23 Frohn, Eric, Dr.Jur. Entgasungventil eines Behälters für den Transport gefährlicher Flüssigkeiten
DE19633006A1 (de) * 1995-08-18 1997-02-20 Mauser Werke Gmbh Entgasungsverschluß

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805991A (en) * 1967-09-11 1974-04-23 G Cheladze Lid construction with non-leak vent
EP0110046A1 (de) * 1982-11-30 1984-06-13 Rhein-Conti Kunststoff-Technik GmbH Gasdurchlässiger Gefässverschluss
EP0382896A1 (de) * 1989-01-31 1990-08-22 Tecumseh Products Company Brennstoffkappe mit Spritzschutz
EP0382146A1 (de) * 1989-02-06 1990-08-16 Unilever N.V. Behälterverschluss mit Innendruckbegrenzer
EP0519168A1 (de) * 1991-06-17 1992-12-23 Frohn, Eric, Dr.Jur. Entgasungventil eines Behälters für den Transport gefährlicher Flüssigkeiten
DE19633006A1 (de) * 1995-08-18 1997-02-20 Mauser Werke Gmbh Entgasungsverschluß

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3023204A1 (de) * 2014-11-21 2016-05-25 HILTI Aktiengesellschaft Handwerkzeuggetriebeverschluss und Handwerkzeugmaschine
WO2016079289A1 (de) * 2014-11-21 2016-05-26 Hilti Aktiengesellschaft Handwerkzeuggetriebeverschluss und handwerkzeugmaschine
CN107000195A (zh) * 2014-11-21 2017-08-01 喜利得股份公司 手持工具传动器封闭装置和手持式工具机
CN107000195B (zh) * 2014-11-21 2020-02-21 喜利得股份公司 手持工具传动器封闭装置和手持式工具机
CN117602236A (zh) * 2023-11-22 2024-02-27 中稀(广西)金源稀土新材料有限公司 一种存稀土罐体排气防倒入方法

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Publication number Publication date
GR2002256Y (en) 2000-07-04
GR980200103U (en) 2000-02-29

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