CA1059086A - Method for the closure of a vessel and vessel closed by means of such method - Google Patents
Method for the closure of a vessel and vessel closed by means of such methodInfo
- Publication number
- CA1059086A CA1059086A CA254,640A CA254640A CA1059086A CA 1059086 A CA1059086 A CA 1059086A CA 254640 A CA254640 A CA 254640A CA 1059086 A CA1059086 A CA 1059086A
- Authority
- CA
- Canada
- Prior art keywords
- vessel
- skirt
- capsule
- mouth
- screw thread
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67B—APPLYING CLOSURE MEMBERS TO BOTTLES JARS, OR SIMILAR CONTAINERS; OPENING CLOSED CONTAINERS
- B67B3/00—Closing bottles, jars or similar containers by applying caps
- B67B3/02—Closing bottles, jars or similar containers by applying caps by applying flanged caps, e.g. crown caps, and securing by deformation of flanges
- B67B3/10—Capping heads for securing caps
- B67B3/12—Capping heads for securing caps characterised by being movable axially relative to cap to deform flanges thereof, e.g. to press projecting flange rims inwardly
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
- Medical Preparation Storing Or Oral Administration Devices (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
- Closing Of Containers (AREA)
- Pressure Vessels And Lids Thereof (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Glanulating (AREA)
- Manufacturing Of Micro-Capsules (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method for the closure of a vessel provided with a neck with an external screw thread and a sealing surface on the outside of the neck between the screw thread and the mouth of the vessel, wherein a preformed metal capsule is placed over the mouth of the vessel, which capsule comprises a closed flat head and a skirt, the inner surface of the head being lined with a layer of sealing material, and the capsule, with the skirt directed downwardly, is pressed downwards against the mouth of the vessel with the aid of a downwardly moving hollow die in such manner that, after such movement, the sealing material covers not only the inner surface of the head of the capsule, but also a part of the inner surface of the upper part of the skirt which adjoins the inner surface of the head, and further, during the downward movement, the hollow die compresses the sealing layer between the sealing surface of the vessel and the upper part of the skirt, after which a screw thread is formed in a lower part of the skirt through the lower part of the skirt being pressed inwardly against that part of the neck of the vessel which is provided with the screw thread. According to the invention, the inner surface of the die which engages the capsule during the closure of the vessel is bevelled.
A method for the closure of a vessel provided with a neck with an external screw thread and a sealing surface on the outside of the neck between the screw thread and the mouth of the vessel, wherein a preformed metal capsule is placed over the mouth of the vessel, which capsule comprises a closed flat head and a skirt, the inner surface of the head being lined with a layer of sealing material, and the capsule, with the skirt directed downwardly, is pressed downwards against the mouth of the vessel with the aid of a downwardly moving hollow die in such manner that, after such movement, the sealing material covers not only the inner surface of the head of the capsule, but also a part of the inner surface of the upper part of the skirt which adjoins the inner surface of the head, and further, during the downward movement, the hollow die compresses the sealing layer between the sealing surface of the vessel and the upper part of the skirt, after which a screw thread is formed in a lower part of the skirt through the lower part of the skirt being pressed inwardly against that part of the neck of the vessel which is provided with the screw thread. According to the invention, the inner surface of the die which engages the capsule during the closure of the vessel is bevelled.
Description
l~S9~86 The invention relates to a method for the closure of a vessel provided with a neck with external screw thread and a seal-ing surface on the outside of the neck between the screw thread and the mouth of the vessel, wherein a preformed metal capsule is placed over the mouth of the vessel, which capsule comprises a closed, flat head and a skirt, the inner surface of the head being lined with a layer of sealing material, and the capsule, with the skirt directed downwardly, is pressed downwards against the mouth of the vessel with the aid of a downwardly moving hollow die in such manner that, after such movement, the sealing material covers not only the inner surface of the head of the capsule, but also a part of the inner surface of the upper part of the skirt which adjoins the inner surface of the head, and further, during its downward movement, the hollow die compresses the sealing layer between the sealing surface of the vessel and the upper part of the skirt, after which a screw thread is formed in a lower part of the skirt through the lower part of the skirt being pressed inwardly against that part of the neck of the vessel which is provided with the screw thread.
A method similar to the above is known from Dutch patent specification 132.786 and is used for the closure of vessels with a nominal neck diameter of 28 mm up to a maximum of 31 mm.
Sealing takes place against the straight cylindrical part of the vessel above the screw thread. To this end, it is necessary that the upper part of the skirt of the capsule be of reduced diameter in order that the sealing material can be pressed sufficiently firmly against this straight cylindrical part. The capsule must be rigid enough not to spring back under the influence of the pressure of, for example, aerated water contained in the vessel.
If the above method is applied to the closure of vessels with a nominal neck diameter of 38 mm, a number of problems arise.
For example, in order to impart the necessary rigidity to the - 1 - ~
- 1~59086 ~ sule, it is necessary to make use of very hard aluminum with a tensile strength of 24 kg/mm2 and a ductility of 7%, while the standard aluminum normally used has a tensile stren~th of 18 kg/mm and a ductility of 10~. This very hard aluminum and the enlarged surface of the capsule result in very great vertical closure forces being applied to the vessels. In the case of capsules with a minimum diameter of 3~ mm, these closure forces can rise to as much as 320 kg. For the normal type of caroussel machine, such loading on one part of the machine is very disadvantageous and leads to high maintenance costs. rloreover, such a closure pressure makes high demands on the crushing strength of the vessels, ~hich are generally of glass. Such great closure forces also naturally rule out the possibility of replacing the glass vessels by, for e~ample, plascic vessels.
The invention is based on appreciation of the fact that, to achieve an effective closure, sealing of the vessel need not necessarily be effected against the straight cylindrical part between the screw thread and the top of the vessel. A
seal against the rounded lip of the mouth of the vessel is sufficient. Such seal can be effected by means of the above-described method, if the inner surface of the die which engages the capsule during the closure of the vessel is bevelled.
Preferably, the bevelled surface of the die makes an angle of 30-60 with the vertical axis of the die.
Accordingl~, the present invention provides a method of closing a pressurized vessel with a preformed metal capsule, said vessel being provided with a neck portion having a mouth and having a helical rib formation on-said neck defining an external screw thread, an upper turn of said scre~.~ thread being displaced downwardlv from the mouth of the vessel so as to leave a thread-free area therebetween, said capsale ::.
- `` ' 1059086 ~-~ying a closed su~stantially flat, head lincd with a layer of sealins m~terial and a depending s~irt, said method comprising:
placing the capsule over the mouth of the vessel with the skirt ~irected downwardly; pressing the capsule against the mouth of the vessel with the aid of a dow~wardly mo~ing hollow die in such a manner that, after such movement, the sealing material covers not only the inner surface of the head of the ca~sule, but also a part of the inner surface of the region of the skirt which adjoins the inner surface of the head, sald hollow die having a bevelled inner surface such that on completion of said down~ardsmovement thereof the upper portion of said skirt extending over said thread-free area substantially from the mouth of the vessel to the upper turn of the screw thread has a frusto-conical shape, said bevelled inner surface further, during said downwards movement, compressing said sealing material against a rounded lip portion from the external periphery of the mouth of the vessel in a generally inwardly and down~ardly inclined direction; and impressing a screw thread into the lot.~er part of the skirt by pressing said lower part against said helical rib formation.
The method of the invention causes a seal to be effected exclusively against the rounded lip of the mouth of the vessel. S~lch a seal is not affected in the event of the head of the capsule assuming a convex form under the influence of the pressure in the vessel, ~1oreover, it is not necessary to reduce the diameter of the upper part of the sXirt of the capsule, so that the force which ~ould other~ise he re~uired for this need not be applied. The location of the seal also means that the capsule need not be made of very hard aluminum, but that standard aluminum will suffice. This has the added advantage of limiting the loading of the machinery for impressin the screw thread, so that wear is less rapid and the need for 1 1~)59()86 ~ ?lacement less frequent. The method permits tl-e closure pressure to be reduced to a~out 50-80 kg without an unfavouraDle effect on the efficiency of the seal, as a result of which it is possible to replace glass vessels by plastic vessels.
- The invention is further described below ~y way of example with reference to the accompanying drawings wherein:
Fig. 1 shows a part1al cross-section of the neck of a vessel with a closure applied by menas of the known method;
and Fig. 2 shows a cross-section corresponding to Fis. 1 with a closure applied in accordance with the invention.
In Figs. 1 and 2 the same items are indicated by the same reference num~ers. A vessel or bottle has a neck 4.
The neck 4 has a top edge 2 provided with a rounded lip 1.
The neck 4 is also provided with a cylindrical lateral surface 3 between a screw thread in the form of a helical rib formation on the neck 4 and the top edge 2 of the neck. As shown in the figures, the surface 3 is thread-free. A preformed capsule 5 is applied to the vessel or bottle. The capsule 5 comprises a head 7 and a skirt. The capsule 5 contains sealing material 6 resting against the head 7 of the capsule and also against the upper part of its skirt. By means of a die 9, the upper part of the skirt of the capsule is reduced in diameter, so that with the ~nown method the sealing material is pressed against the cylindrical surface of the neck 4 of the vessel. There-after, the screw thread 8 is impressed into the lower part of the s~irt.
The most important difference between the method according to the invention and that illustrated by Fig. 1 derives from the shape of the die 9, an inner surface 10 of which is bevelled in the method according to the invention. The bevelled surface 10 of the die preferably makes an angle of _4_ ~ 60 with the axis of the die. I~1hen closure pressure is applied to the die 9, the capsule 5 acquires an oblique surface 11 which forms a frusto-conical transitional zone extending o~-er - the cylindrical surface 3 between the head 7 and the lower part of the skirt of the capsule 5 into which the screw-thread is impressed. The sealing material is pressed mainly against the rounded lip 1 of the neck 4 of the vessel. Conseauently, if the head 7 assumes a convex form under the influence of excess pressure in the vessel, the seal against the rounded lip 1 remains intact.
(~i' - ' .
A method similar to the above is known from Dutch patent specification 132.786 and is used for the closure of vessels with a nominal neck diameter of 28 mm up to a maximum of 31 mm.
Sealing takes place against the straight cylindrical part of the vessel above the screw thread. To this end, it is necessary that the upper part of the skirt of the capsule be of reduced diameter in order that the sealing material can be pressed sufficiently firmly against this straight cylindrical part. The capsule must be rigid enough not to spring back under the influence of the pressure of, for example, aerated water contained in the vessel.
If the above method is applied to the closure of vessels with a nominal neck diameter of 38 mm, a number of problems arise.
For example, in order to impart the necessary rigidity to the - 1 - ~
- 1~59086 ~ sule, it is necessary to make use of very hard aluminum with a tensile strength of 24 kg/mm2 and a ductility of 7%, while the standard aluminum normally used has a tensile stren~th of 18 kg/mm and a ductility of 10~. This very hard aluminum and the enlarged surface of the capsule result in very great vertical closure forces being applied to the vessels. In the case of capsules with a minimum diameter of 3~ mm, these closure forces can rise to as much as 320 kg. For the normal type of caroussel machine, such loading on one part of the machine is very disadvantageous and leads to high maintenance costs. rloreover, such a closure pressure makes high demands on the crushing strength of the vessels, ~hich are generally of glass. Such great closure forces also naturally rule out the possibility of replacing the glass vessels by, for e~ample, plascic vessels.
The invention is based on appreciation of the fact that, to achieve an effective closure, sealing of the vessel need not necessarily be effected against the straight cylindrical part between the screw thread and the top of the vessel. A
seal against the rounded lip of the mouth of the vessel is sufficient. Such seal can be effected by means of the above-described method, if the inner surface of the die which engages the capsule during the closure of the vessel is bevelled.
Preferably, the bevelled surface of the die makes an angle of 30-60 with the vertical axis of the die.
Accordingl~, the present invention provides a method of closing a pressurized vessel with a preformed metal capsule, said vessel being provided with a neck portion having a mouth and having a helical rib formation on-said neck defining an external screw thread, an upper turn of said scre~.~ thread being displaced downwardlv from the mouth of the vessel so as to leave a thread-free area therebetween, said capsale ::.
- `` ' 1059086 ~-~ying a closed su~stantially flat, head lincd with a layer of sealins m~terial and a depending s~irt, said method comprising:
placing the capsule over the mouth of the vessel with the skirt ~irected downwardly; pressing the capsule against the mouth of the vessel with the aid of a dow~wardly mo~ing hollow die in such a manner that, after such movement, the sealing material covers not only the inner surface of the head of the ca~sule, but also a part of the inner surface of the region of the skirt which adjoins the inner surface of the head, sald hollow die having a bevelled inner surface such that on completion of said down~ardsmovement thereof the upper portion of said skirt extending over said thread-free area substantially from the mouth of the vessel to the upper turn of the screw thread has a frusto-conical shape, said bevelled inner surface further, during said downwards movement, compressing said sealing material against a rounded lip portion from the external periphery of the mouth of the vessel in a generally inwardly and down~ardly inclined direction; and impressing a screw thread into the lot.~er part of the skirt by pressing said lower part against said helical rib formation.
The method of the invention causes a seal to be effected exclusively against the rounded lip of the mouth of the vessel. S~lch a seal is not affected in the event of the head of the capsule assuming a convex form under the influence of the pressure in the vessel, ~1oreover, it is not necessary to reduce the diameter of the upper part of the sXirt of the capsule, so that the force which ~ould other~ise he re~uired for this need not be applied. The location of the seal also means that the capsule need not be made of very hard aluminum, but that standard aluminum will suffice. This has the added advantage of limiting the loading of the machinery for impressin the screw thread, so that wear is less rapid and the need for 1 1~)59()86 ~ ?lacement less frequent. The method permits tl-e closure pressure to be reduced to a~out 50-80 kg without an unfavouraDle effect on the efficiency of the seal, as a result of which it is possible to replace glass vessels by plastic vessels.
- The invention is further described below ~y way of example with reference to the accompanying drawings wherein:
Fig. 1 shows a part1al cross-section of the neck of a vessel with a closure applied by menas of the known method;
and Fig. 2 shows a cross-section corresponding to Fis. 1 with a closure applied in accordance with the invention.
In Figs. 1 and 2 the same items are indicated by the same reference num~ers. A vessel or bottle has a neck 4.
The neck 4 has a top edge 2 provided with a rounded lip 1.
The neck 4 is also provided with a cylindrical lateral surface 3 between a screw thread in the form of a helical rib formation on the neck 4 and the top edge 2 of the neck. As shown in the figures, the surface 3 is thread-free. A preformed capsule 5 is applied to the vessel or bottle. The capsule 5 comprises a head 7 and a skirt. The capsule 5 contains sealing material 6 resting against the head 7 of the capsule and also against the upper part of its skirt. By means of a die 9, the upper part of the skirt of the capsule is reduced in diameter, so that with the ~nown method the sealing material is pressed against the cylindrical surface of the neck 4 of the vessel. There-after, the screw thread 8 is impressed into the lower part of the s~irt.
The most important difference between the method according to the invention and that illustrated by Fig. 1 derives from the shape of the die 9, an inner surface 10 of which is bevelled in the method according to the invention. The bevelled surface 10 of the die preferably makes an angle of _4_ ~ 60 with the axis of the die. I~1hen closure pressure is applied to the die 9, the capsule 5 acquires an oblique surface 11 which forms a frusto-conical transitional zone extending o~-er - the cylindrical surface 3 between the head 7 and the lower part of the skirt of the capsule 5 into which the screw-thread is impressed. The sealing material is pressed mainly against the rounded lip 1 of the neck 4 of the vessel. Conseauently, if the head 7 assumes a convex form under the influence of excess pressure in the vessel, the seal against the rounded lip 1 remains intact.
(~i' - ' .
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of closing a pressurized vessel with a preformed metal capsule, said vessel being provided with a neck portion having a mouth and having a helical rib formation on said neck defining an external screw thread, an upper turn of said screw thread being displaced downwardly from the mouth of the vessel so as to leave a thread free area therebetween said capsule having a closed, substantially flat, head lined with a layer of sealing material and a depending skirt, said method comprising: placing the capsule over the mouth of the vessel with the skirt directed downwardly; pressing the capsule against the mouth of the vessel with the aid of a downwardly moving hollow die in such a manner that, after such movement, the sealing material covers not only the inner surface of the head of the capsule, but also a part of the inner surface of the region of the skirt which adjoins the inner surface of the head, said hollow die having a bevelled inner surface such that on completion of said downwards movement thereof the upper portion of said skirt extending over said thread-free area substantially from the mouth of the vessel to the upper turn of the screw thread has a frusto-conical shape, said bevelled inner surface further, during said downwards movement, compressing said sealing material against a rounded lip portion from the external periphery of the mouth of the vessel in a generally inwardly and downwardly inclined direction; and impressing a screw thread into the lower part of the skirt by pressing said lower part against said helical rib formation.
2. A method according to claim 1, wherein the bevelled surface of the die makes an angle of between 30 and 60° with the vertical axis of the die.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7506993A NL7506993A (en) | 1975-06-12 | 1975-06-12 | PROCEDURE FOR CLOSING A HOLDER, AS WELL AS HOLDER CLOSED APPLYING THE PROCESS. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1059086A true CA1059086A (en) | 1979-07-24 |
Family
ID=19823943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA254,640A Expired CA1059086A (en) | 1975-06-12 | 1976-06-11 | Method for the closure of a vessel and vessel closed by means of such method |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5224316A (en) |
| CA (1) | CA1059086A (en) |
| DE (1) | DE2626240A1 (en) |
| ES (1) | ES448842A1 (en) |
| FR (1) | FR2314136A1 (en) |
| GB (1) | GB1527816A (en) |
| NL (1) | NL7506993A (en) |
| SE (1) | SE7605578L (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH041405Y2 (en) * | 1984-09-29 | 1992-01-17 | ||
| DE19910443A1 (en) * | 1999-03-10 | 2000-09-14 | Alcoa Gmbh Verpackwerke | Molding tool and method for closing containers |
-
1975
- 1975-06-12 NL NL7506993A patent/NL7506993A/en not_active Application Discontinuation
-
1976
- 1976-05-17 SE SE7605578A patent/SE7605578L/en not_active Application Discontinuation
- 1976-06-09 DE DE19762626240 patent/DE2626240A1/en not_active Withdrawn
- 1976-06-10 JP JP6818276A patent/JPS5224316A/en active Pending
- 1976-06-10 GB GB2407076A patent/GB1527816A/en not_active Expired
- 1976-06-11 FR FR7617847A patent/FR2314136A1/en active Granted
- 1976-06-11 CA CA254,640A patent/CA1059086A/en not_active Expired
- 1976-06-12 ES ES448842A patent/ES448842A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES448842A1 (en) | 1977-11-01 |
| DE2626240A1 (en) | 1976-12-30 |
| FR2314136B3 (en) | 1979-03-02 |
| JPS5224316A (en) | 1977-02-23 |
| NL7506993A (en) | 1976-12-14 |
| FR2314136A1 (en) | 1977-01-07 |
| GB1527816A (en) | 1978-10-11 |
| SE7605578L (en) | 1976-12-13 |
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