GB2401914A - Valve joint and the process of its manufacture - Google Patents
Valve joint and the process of its manufacture Download PDFInfo
- Publication number
- GB2401914A GB2401914A GB0418137A GB0418137A GB2401914A GB 2401914 A GB2401914 A GB 2401914A GB 0418137 A GB0418137 A GB 0418137A GB 0418137 A GB0418137 A GB 0418137A GB 2401914 A GB2401914 A GB 2401914A
- Authority
- GB
- United Kingdom
- Prior art keywords
- joint
- gasket
- surface treatment
- valve
- process 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000004381 surface treatment Methods 0.000 claims abstract description 37
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 239000003380 propellant Substances 0.000 claims abstract description 11
- 230000000903 blocking effect Effects 0.000 claims abstract description 10
- 239000012632 extractable Substances 0.000 claims abstract description 10
- YFMFNYKEUDLDTL-UHFFFAOYSA-N 1,1,1,2,3,3,3-heptafluoropropane Chemical compound FC(F)(F)C(F)C(F)(F)F YFMFNYKEUDLDTL-UHFFFAOYSA-N 0.000 claims abstract description 9
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 claims abstract description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000004888 barrier function Effects 0.000 claims abstract description 6
- 239000002174 Styrene-butadiene Substances 0.000 claims description 8
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000011115 styrene butadiene Substances 0.000 claims description 8
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 8
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 7
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 5
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 5
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 5
- 229910052801 chlorine Inorganic materials 0.000 claims description 5
- 239000000460 chlorine Substances 0.000 claims description 5
- 238000010894 electron beam technology Methods 0.000 claims description 5
- -1 ethylene propylene diene Chemical class 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 5
- 239000011737 fluorine Substances 0.000 claims description 5
- 229920005555 halobutyl Polymers 0.000 claims description 5
- 125000004968 halobutyl group Chemical group 0.000 claims description 5
- 229910052736 halogen Inorganic materials 0.000 claims description 5
- 150000002367 halogens Chemical class 0.000 claims description 5
- 229920006168 hydrated nitrile rubber Polymers 0.000 claims description 4
- 239000007844 bleaching agent Substances 0.000 claims description 3
- 150000002826 nitrites Chemical class 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/16—Surface shaping of articles, e.g. embossing; Apparatus therefor by wave energy or particle radiation, e.g. infrared heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0866—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation
- B29C2035/0877—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation using electron radiation, e.g. beta-rays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2021/00—Use of unspecified rubbers as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
- B29L2031/265—Packings, Gaskets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/748—Machines or parts thereof not otherwise provided for
- B29L2031/7506—Valves
Landscapes
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
Abstract
A valve joint or gasket of a dispensing valve of a fluid product dispensing device, said joint being intended to come into contact with a fluid product comprising an aerosol propellant of the HFC-134a or HFC-227 type, with or without alcohol, characterised in that said joint comprises a surface subjected to a surface treatment, said surface treatment being adapted to lower the friction coefficient of the joint so as to reduce the risks of the valve blocking and/or to create a barrier on the joint surface so as to reduce the level of extractables from said joint.
Description
J
VALVE JOINT AND THE PROCESS OF ITS MANUFACTURE
The present invention relates to a valve joint or gasket and the process of its manufacture.
Many fluid product dispensing devices comprise valves, particularly measuring valves, to dispense the product contained in the device, by means of an aerosol propellant.
For ecological reasons, conventional aerosol propellants of the CFC type used in the past have been steadily replaced by aerosol propellants, which are less harmful to the environment, such as particularly the gases HFC 134a or HFC-227. The use of these aerosol propellants however brings with it a certain number of problems. On the one hand they place increased stress on the joints or gaskets, which can bring about more significant swelling, liable to lead to a problem of blocking of the valve which slides within the joints, a problem generally denoted by the expression "sticking". On the other hand the joint may be led to release compounds known by the term extractables.
These extractables are compounds, extracted from the joints by the propellant, which contaminate or pollute the fluid product to be dispensed.
The purpose of the present invention is to provide a joint or gasket and a manufacturing process of said joint or gasket which does not have the above-mentioned drawbacks.
Another purpose of the present invention is to provide a joint or gasket and a process for its manufacture which is simple and inexpensive to carry out.
The purpose of the present invention is to provide a joint or gasket, which can be used with HFC-134a or HFC-227 gases, in respect of which the release of extractables is reduced.
Another purpose of the present invention is to provide a joint or gasket, which can be used with HFC-134a or HFC- 227 gases, which reduce valve blocking problems.
The object of the present invention is therefore a process for manufacturing a valve joint or gasket of a dispensing valve of a fluid product dispensing device, said joint or gasket being intended to come into contact with a fluid product comprising an aerosol propellant of the HFC- 134a or HFC-227 type, with or without alcohol,characterised in that said process includes a joint or gasket surface treatment, said surface treatment reducing the friction coefficient of the joint or gasket so as to reduce the risks of the valve blocking and/or said surface treatment creating a barrier on the joint or gasket surface so as to reduce the level of extractables from said joint or gasket.
To advantage, said joint or gasket includes one or more of the following materials: nitrite, neoprene, butyl, halobutyl, EPDM (ethylene propylene diene), SBR (styrene butadiene), HNBR (hydrogenated nitrite).
According to a first embodiment of the invention, said surface treatment is of the chemical type.
To advantage, said surface treatment includes grafting halogens on the joint or gasket surface.
To advantage, the halogens include chlorine and/or fluorine.
To advantage, said surface treatment includes oxidising the joint or gasket surface in a chlorinated medium.
To advantage, said surface treatment includes immersing the joint or gasket in a solution containing water, hydrochloric acid and bleach.
According to a second embodiment of the invention, said surface treatment is of the physical type.
To advantage, said surface treatment includes modifying the joint or gasket surface by means of electron beams.
To advantage, said surface treatment includes subjecting the joint or gasket to an irradiation treatment, the power of which may vary from about 150 KeV to about 10 MeV.
Another object of the present invention is a valve joint or gasket of a dispensing valve of a fluid product dispensing device, said joint or gasket being intended to come into contact with a fluid product comprising an aerosol propellant of the HFC-134a or HFC-227 type, with or without alcohol, characterized in that said joint or gasket comprises a surface subjected to a surface treatment, said surface treatment being adapted to lower the friction coefficient of the joint or gasket so as to reduce the risks of the valve blocking and/or to create a barrier on the joint or gasket surface so as to reduce the level of extractables from said joint or gasket.
To advantage, said joint or gasket includes one or more of the following materials: nitrite, neoprene, butyl,halobutyl, EPDM, SBR, HNBR.
According to a first embodiment variant, the joint or gasket surface is modified by grafting atoms of chlorine and/or fluorine.
According to a second embodiment variant, the joint or gasket surface is irradiated by electron beams, the power of which may vary from about 150 Rev to about 10 MeV.
Other characteristics and advantages of the present invention will emerge more clearly during the following detailed description of two embodiments of the invention, given as non-restrictive examples.
Thus, the object of the invention is a valve joint or gasket, particularly a measuring valve joint or gasket, for a fluid product dispensing device. This joint may be a static joint or a dynamic joint, in other words a joint or gasket in which the valve slides. This joint is intended to be in contact with the fluid product which comprises an aerosol propellant of the HFC-134a or HFC-227 type, with or without alcohol, and the invention provides for the application of a surface treatment to said joint in order on the one hand to reduce the risks of the valve blocking and on the other hand to reduce the level of extractables from the joint.
To reduce the risks of the valve blocking, the surface treatment provides for a lowering of the friction coefficient of the joint, and to reduce the level of extractables from the joint, the surface treatment creates a barrier on the joint surface. These effects may be obtained separately or, preferably, together with the same surface treatment.
The joints of the invention, which may be subjected to the surface treatment, may particularly be constituted by one or more of the following materials: nitrite, neoprene, butyl, halobutyl, EPDM (ethylene propylene diene), SBR (styrene butadiene), HNBR (hydrogenated nitrite). Any combination of these materials may also be used. Clearly, other materials may also be used to make the joints to - which the present invention applies.
According to a first embodiment variant, the surface treatment of the joint is of the chemical type.
In particular, this surface treatment may include grafting halogens, such as atoms of chlorine and/or fluorine on the joint surface. A means of achieving this is to oxidise the joint surface in a chlorinated medium, for example by immersing the joint in a solution containing - water, hydrochloric acid and bleach.
According to a second variant of the invention, the surface treatment may be of the physical type. In particular this surface treatment may include modifying the joint surface by means of electron beams, subjecting the joint to an irradiation treatment, the power of this irradiation being able to vary between about 150 KeV to about 10 MeV, depending on the required performance, such as depth of treatment, speed of treatment, etc. The table given below shows the effect of the surface treatment on the friction coefficients.
The friction coefficients were measured according 25 to the NET 54-112 standard. This consists in sliding a rubber material over a given plastic medium. The force required to initiate movement and then to maintain it is then recorded. Two coefficients are deduced from this: - the static friction coefficient, which characterizes slide initiation (Ks), - the dynamic friction coefficient, which characterizes continuous slide (Kd).
_
Friction coefficient Ks Kd | _
_
Untreated nitrite 1.34 * Treated nitrite 0.32 0.31
_ _
Untreated neoprene 1.12 0.61 Treated neoprene 0.41 0.30 * measurement impossibl e because of too much fri ction The table above shows well the very significant effect of the surface treatment of the invention on the friction coefficient, which therefore significantly reduces the risks of sticking, in other words the blocking of the valve.
Although the invention has been described with reference to two particular embodiments of it, it is understood that various modifications may be made to it, by the man skilled in the art, without departing from the framework of the present invention, as set out in the appended claims.
Claims (16)
1. A process for manufacturing a valve joint or gasket of a dispensing valve of a fluid product dispensing device, said joint or gasket being intended to come into contact with a fluid product comprising an aerosol propellant of the HFC-134a or HFC-227 type, with or without alcohol, characterized in that said process includes a joint or gasket surface treatment, said surface treatment reducing the friction coefficient of the joint or gasket so as to reduce the risks of the valve blocking and/or said surface treatment creating a barrier on the joint or gasket surface so as to reduce the level of extractables from said joint or gasket.
2. A process according to claim 1, wherein said joint or gasket includes one or more of the following materials: nitrite, neoprene, butyl, halobutyl, EPDM (ethylene propylene diene), SBR (styrene butadiene), HNBR(hydrogenated nitrite).
3. A process according to claim 1 or 2, wherein said surface treatment is of the physical type.
4. A process according to claim 3, wherein said surface treatment includes modifying the joint or gasket surface by means of electron beams.
5. A process according to claim 4, wherein said surface treatment includes subjecting the joint or gasket to an irradiation treatment, the power of which may vary from about 150 KeV to about 10 MeV.
6. A process according to claim 1 or 2, wherein said surface treatment is of the chemical type.
7. A process according to claim 6, wherein said surface treatment includes grafting halogens on the joint or gasket surface.
8. A process according to claim 7, wherein the halogens include chlorine and/or fluorine.
9. A process according to any one of claims 6 to 8, wherein said surface treatment includes oxidising the joint or gasket surface in a chlorinated medium.
10. A process according to claim 9, wherein said surface treatment includes immersing the joint or gasket in a solution containing water, hydrochloric acid and bleach.
11. A valve joint or gasket of a dispensing valve of a fluid product dispensing device, said joint or gasket being intended to come into contact with a fluid product comprising an aerosol propellant of the HFC134a or HFC-227 type, with or without alcohol, characterized in that said joint or gasket includes a surface subjected to a surface treatment, said surface treatment being adapted to reduce the friction coefficient of the joint or gasket so as to reduce the risks of the valve blocking and/or to create a barrier on the joint or gasket surface so as to reduce the level of extractables from said joint or gasket.
12. A joint or gasket according to claim 11, wherein said joint or gasket includes one or more of the following materials: nitrite, neoprene, butyl, halobutyl, EPDM, SBR, HNBR.
13. A joint or gasket according to claim 11 or 12,wherein the joint surface is irradiated by electron beams, the power of which may vary from about 150 KeV to about 10 MeV.
14. A joint or gasket according to claim 11 or 12, wherein the joint or gasket surface is modified by grafting atoms of chlorine and/or fluorine.
15. A process for manufacturing a valve joint or gasket of a dispensing valve of a fluid product dispensing device, substantially as herein described and exemplified.
16. A valve joint or gasket of a dispensing valve of a fluid product dispensing device, substantially as herein described and exemplified.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0014530A FR2816688B1 (en) | 2000-11-10 | 2000-11-10 | VALVE GASKET AND MANUFACTURING METHOD THEREOF |
| GB0127010A GB2371092B (en) | 2000-11-10 | 2001-11-09 | Valve gasket and the process of its manufacture |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0418137D0 GB0418137D0 (en) | 2004-09-15 |
| GB2401914A true GB2401914A (en) | 2004-11-24 |
| GB2401914B GB2401914B (en) | 2005-03-16 |
Family
ID=33312267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0418137A Expired - Lifetime GB2401914B (en) | 2000-11-10 | 2001-11-09 | Valve gasket and the process of its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2401914B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0870699A2 (en) * | 1995-03-10 | 1998-10-14 | Minnesota Mining And Manufacturing Company | Aerosol valves |
| WO1999042154A1 (en) * | 1998-02-23 | 1999-08-26 | Bespak Plc | Drug delivery devices |
| WO1999055600A1 (en) * | 1998-04-30 | 1999-11-04 | 3M Innovative Properties Company | Metered-dose valve for pharmaceutical aerosol |
| GB2361229A (en) * | 2000-04-14 | 2001-10-17 | Presspart Mfg Ltd | Metering valve |
-
2001
- 2001-11-09 GB GB0418137A patent/GB2401914B/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0870699A2 (en) * | 1995-03-10 | 1998-10-14 | Minnesota Mining And Manufacturing Company | Aerosol valves |
| WO1999042154A1 (en) * | 1998-02-23 | 1999-08-26 | Bespak Plc | Drug delivery devices |
| EP1088567A2 (en) * | 1998-02-23 | 2001-04-04 | Bespak plc | Improvements in drug delivery devices |
| WO1999055600A1 (en) * | 1998-04-30 | 1999-11-04 | 3M Innovative Properties Company | Metered-dose valve for pharmaceutical aerosol |
| GB2361229A (en) * | 2000-04-14 | 2001-10-17 | Presspart Mfg Ltd | Metering valve |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2401914B (en) | 2005-03-16 |
| GB0418137D0 (en) | 2004-09-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Expiry date: 20211108 |