CA1222860A - Method for heat treatment of articles and arrangement for carrying out the method - Google Patents
Method for heat treatment of articles and arrangement for carrying out the methodInfo
- Publication number
- CA1222860A CA1222860A CA000463843A CA463843A CA1222860A CA 1222860 A CA1222860 A CA 1222860A CA 000463843 A CA000463843 A CA 000463843A CA 463843 A CA463843 A CA 463843A CA 1222860 A CA1222860 A CA 1222860A
- Authority
- CA
- Canada
- Prior art keywords
- articles
- water
- vessel
- heat
- gaseous medium
- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/26—Accessories or devices or components used for biocidal treatment
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
- A61L2/04—Heat
- A61L2/06—Hot gas
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
- A61L2/04—Heat
- A61L2/06—Hot gas
- A61L2/07—Steam
Abstract
ABSTRACT
In a chamber in a pressure vessle, e.g. an autoclave, articles are heat-treated by water, which is sprayed over the articles through nozzles and supplies heat to or removes heat from the articles. Simultaneously, a gaseous medium, e.g. a mixture of steam and air, is forced by an impeller to flow through the articles in countercurrent to the water. By this a very even temperature distribution of the articles in the chamber is obtained.
In a chamber in a pressure vessle, e.g. an autoclave, articles are heat-treated by water, which is sprayed over the articles through nozzles and supplies heat to or removes heat from the articles. Simultaneously, a gaseous medium, e.g. a mixture of steam and air, is forced by an impeller to flow through the articles in countercurrent to the water. By this a very even temperature distribution of the articles in the chamber is obtained.
Description
The present invention relates to a method for heat treatment of articles which are placed in a chamber in a preessure ves~el, heat beinq supplied to and heat being removed from, respectively, the articles via water circulated in a closed circulation circuit and sprayed over the articles, whcih water during a heating period is heated by steam being introduced into the vessel and during a cooling period cooled by a ~irst heat exchanger in the circulation circuit.
The invention furthermore relates to an arrangement for heat treatment of articles which are placed in a cnamber in a pressure vessel for carrying out the method, which arrangement comprises a closed circulation circuit for water including a bottom outlet in the pressure vessel, a pump, a first heat exhcanger and nozzles which spray the water over the articles in the chamber, and means for supplying steam to the vessel.
It is known to sterilize articles, e.g. liquids in glass- or plastic packages, in a pressure vessel~ The packages are placed in the vessel, which is then closed, and the articles are heated to sterilizing temperature by water being sprayed through nozzles over the article~. This water is collected at the bottom of the vessel and pumped through il6~
a return conduit back to the no~zles. I~he water is heated by steam supplied to the vessel. When the steriliziny temperature has been reached and the articles have been kept at this temperature a certain time, the articles are cooled by water, which has been colled in a heat exchanger in the return conduit, being sprayed over the articles. After that the vessel is opened and the sterilized articles can be taken out.
The drawback of the known method is that the articles in difEerent parts of the vessel are unevenly heated and cooled, respectively, which is detrimetnal to the sterilizing result.
It is also kno~n to sterilize articles, e.g.
li~uid in glass- or plastic packaqes, by exposing them to a flow of gaseous medium, which flow is generated by an impeller inside the pressure vessel. The gaseous medium can for example be composed by a mixture of air and steam.
During heating steam is supplied to the vessel and circulated together with the air through the articles by the impeller. Inside the vessel a heat exchanger is arranged in the flow of the gaseous medium to cool the gaseous medium during cooling of the articles.
This method also has the drawback, that articles in di~ferent parts oE the vessel are unevenly heated and cooled, respectively.
The object of the invention is to eliminate said drawback and provide a temperature distribution of the articles in the chamber which is as even as possible. This object is attained by the method according to the invention thereby that simultaneously as the water is sprayed over the articles and flows downwards through them gaseous medium in the vessel is forced to flow upwards through the articles, and by the arrangement according to the invention thereby that an impeller is arranged in the vessel for generating a forced circulating flow of gaseous medium through the articles in countercurrent to the water flowing downwards through the articles and that meanes are arranged for driving the impeller and the pump simultaneously.
An embodiment of an arrangement according to the invention will be described below with reference to the accompanying drawing. The drawing Figure is cross sectional view of a pressure vessel filled with articles to be heat-treated and having means for controlling the process.
. .
The numberal 10 designates a pressure vessel in the form of an insulated cylirlder 12 with end walls (not shown). In the lower part of the vessel is an outlet 14, which communicates with a pump 16. The pressure side of the pump is connected to the inlet of heat exchan~er 18, the outlet of which is connected to several spray nozzles 20 positioned in the top wall 22 of chamber 24, into which the articles to be sterilized, e.~. qlass packages 26, are inserted.~ By the chamber 24 comprising vertical walls 28, the vessel obtains double-walled form. Heat exchangers 32 are arranqed in ducts 30 located outside the walls 28.
In the upper part of the vessel there is an impeller 34, the inlet of which is located in the top wall 22 of the chamber 24. The outlet of the impeller is directed radially and communicates with the chamber via the ducts 30 and an opening 36 in the bottom of the chal~er 24.
In the vessel there are furthermore one or more steam inlets 38.
The arrangement works in the following way. After the articles to be heat-treated have been inserted in the chamber 24, thes door (not shown) of the vessel is closed.
A quantity of water is supplied to the lower ~art of the vessel via a valve 58. The treatment is thereafter started ~zz~
by a control means 40, which simultaneously starts the pump 16, so that water will be sprayed over the articles, the impeller 34, so that gaseous medium, at the beginning only air, will flow throuqh the articles, and opens a valve 42 to the steam inlet, so that steam will flow into the vessel.
The steam heats the air and water flowing through the articles, the water being heated by the steam condensing in it. The circulating air is mixed with the steam and brinqs about an intense mixinq and heating effect inside the chamber 24 on the water which is sprayed over the articles and flows downwards through them, so that all parts of the articles will be heated evenly and rapidlY.
A temperature sensor 44 senses the temperture in the chamber 24 and regulates via the steam valve 42 the steam supply to the vessel in dependence of the temperture in the chamber 24.
When another temperture sensor 46 located in a representati~e glass package in the chamber 24, senses that the desired treatment ~emperature has been reached in the package, it gives a signal to a timer 48 of the control means to start. When the timer has run the time, during which the desired heat treatment shall take p~ace, it - initiates simulateous closing of the steam valve 42 and 28~
openinq of the valves 50 and 52 of the heat exchanqers 18 and 32, respectively, so that cooling water flow through them and cool both the water being sprayed over the articles and the gas mixture circulated through the articles. The cieculating gas mixture brings about an intense mixing and cooling effect inside the chamber 24 on the water which is sprayed over the articles and flows downwards through them, so that all ~arts of the articles will be cooled evenly and rapidly.
When the articles are cooled to the desired temperature the pump 16 and the impeller 34 are stopped and the valves 50 and 52 are closed, after which the water is discharged through a valve 60 and the pressure by opening of a valve 54. The vessel can then be opened and the heat treated, e.g. sterilized, articles be taken out.
During the whole process the desired pressure in the vessel is controlled by supplying sterile compressed air through a valve 56 or by discharging gaseous medium through the valve 54.
Tests have been made which show the difference in result between the two said known methods and the method according to the inventionO The chamber 24 is an arrangement accoring to the drawing was filled with glass 1~2~6~
packages 26. The temperature Tl, T2 and T3 were measured in three different packages.
The first known method described in the description was carried out on the packages. The impeller 34 was standing still while the pump 16 was running, spraying water over the packages. Heating was effected by steam only from the steam inlet 38. Cooling was effected by the heat exchanqer 18 only. The result is evident from Table 1.
Without moving the packages in the chamber 24 the second known method described in the description was carried out on the packages. The pump 16 was standing still while the impeller 34 was running and circulated gaseous medium between the packages. Heating was effected by steam only from the steam inlet 38. Cooling was effected by the heat exchangers 32 only. The result is evident from Table 20 The packages were furthermore subjected to the method according to the invention. The pump 16 as well as the impeller 34 were running. ~eating was effected by steam only from the steam inlet 38. Cooling was effected by as well the heat exchanger 18 as by the heat exchangers 32.
The result is evident from Table 3.
. .
? 2 2 ~? ~? ~
.: Cl rClIIA~ t Wl~
Tim~ ~1 T2 r3 m5n., 3~7C- C C C
0 00 42 ? 1 37,0 36 6 He~tlng 2'~0~ 84,9 90,4 84 7 4 '00~ 113,4 118,0 114,5 6'00~ 127,5 12~,7 127,9 6'00~ 127,5 12~,7 127,g Sterllizlng7700~ 127,8 127,9 127,8 ~'o~r 127,9 12~,0 127,9 ~-~on 127,S 128,0 127,9 Coollng g 00 IOQ,6 97,5 98,2 109~0~ 7~,1 74,2- 74,2 11 45 4890 47,6 4;?~5 T~bl~ 2. Circ~l~um only Time Tl T2 T3 mln., sec. oc oc oc 0'0~" 36,0 2~,7 35,8 He~tin I'00" 94,5 89,6 88,8 9 2'00" 123,~ 121,9- 119,6
The invention furthermore relates to an arrangement for heat treatment of articles which are placed in a cnamber in a pressure vessel for carrying out the method, which arrangement comprises a closed circulation circuit for water including a bottom outlet in the pressure vessel, a pump, a first heat exhcanger and nozzles which spray the water over the articles in the chamber, and means for supplying steam to the vessel.
It is known to sterilize articles, e.g. liquids in glass- or plastic packages, in a pressure vessel~ The packages are placed in the vessel, which is then closed, and the articles are heated to sterilizing temperature by water being sprayed through nozzles over the article~. This water is collected at the bottom of the vessel and pumped through il6~
a return conduit back to the no~zles. I~he water is heated by steam supplied to the vessel. When the steriliziny temperature has been reached and the articles have been kept at this temperature a certain time, the articles are cooled by water, which has been colled in a heat exchanger in the return conduit, being sprayed over the articles. After that the vessel is opened and the sterilized articles can be taken out.
The drawback of the known method is that the articles in difEerent parts of the vessel are unevenly heated and cooled, respectively, which is detrimetnal to the sterilizing result.
It is also kno~n to sterilize articles, e.g.
li~uid in glass- or plastic packaqes, by exposing them to a flow of gaseous medium, which flow is generated by an impeller inside the pressure vessel. The gaseous medium can for example be composed by a mixture of air and steam.
During heating steam is supplied to the vessel and circulated together with the air through the articles by the impeller. Inside the vessel a heat exchanger is arranged in the flow of the gaseous medium to cool the gaseous medium during cooling of the articles.
This method also has the drawback, that articles in di~ferent parts oE the vessel are unevenly heated and cooled, respectively.
The object of the invention is to eliminate said drawback and provide a temperature distribution of the articles in the chamber which is as even as possible. This object is attained by the method according to the invention thereby that simultaneously as the water is sprayed over the articles and flows downwards through them gaseous medium in the vessel is forced to flow upwards through the articles, and by the arrangement according to the invention thereby that an impeller is arranged in the vessel for generating a forced circulating flow of gaseous medium through the articles in countercurrent to the water flowing downwards through the articles and that meanes are arranged for driving the impeller and the pump simultaneously.
An embodiment of an arrangement according to the invention will be described below with reference to the accompanying drawing. The drawing Figure is cross sectional view of a pressure vessel filled with articles to be heat-treated and having means for controlling the process.
. .
The numberal 10 designates a pressure vessel in the form of an insulated cylirlder 12 with end walls (not shown). In the lower part of the vessel is an outlet 14, which communicates with a pump 16. The pressure side of the pump is connected to the inlet of heat exchan~er 18, the outlet of which is connected to several spray nozzles 20 positioned in the top wall 22 of chamber 24, into which the articles to be sterilized, e.~. qlass packages 26, are inserted.~ By the chamber 24 comprising vertical walls 28, the vessel obtains double-walled form. Heat exchangers 32 are arranqed in ducts 30 located outside the walls 28.
In the upper part of the vessel there is an impeller 34, the inlet of which is located in the top wall 22 of the chamber 24. The outlet of the impeller is directed radially and communicates with the chamber via the ducts 30 and an opening 36 in the bottom of the chal~er 24.
In the vessel there are furthermore one or more steam inlets 38.
The arrangement works in the following way. After the articles to be heat-treated have been inserted in the chamber 24, thes door (not shown) of the vessel is closed.
A quantity of water is supplied to the lower ~art of the vessel via a valve 58. The treatment is thereafter started ~zz~
by a control means 40, which simultaneously starts the pump 16, so that water will be sprayed over the articles, the impeller 34, so that gaseous medium, at the beginning only air, will flow throuqh the articles, and opens a valve 42 to the steam inlet, so that steam will flow into the vessel.
The steam heats the air and water flowing through the articles, the water being heated by the steam condensing in it. The circulating air is mixed with the steam and brinqs about an intense mixinq and heating effect inside the chamber 24 on the water which is sprayed over the articles and flows downwards through them, so that all parts of the articles will be heated evenly and rapidlY.
A temperature sensor 44 senses the temperture in the chamber 24 and regulates via the steam valve 42 the steam supply to the vessel in dependence of the temperture in the chamber 24.
When another temperture sensor 46 located in a representati~e glass package in the chamber 24, senses that the desired treatment ~emperature has been reached in the package, it gives a signal to a timer 48 of the control means to start. When the timer has run the time, during which the desired heat treatment shall take p~ace, it - initiates simulateous closing of the steam valve 42 and 28~
openinq of the valves 50 and 52 of the heat exchanqers 18 and 32, respectively, so that cooling water flow through them and cool both the water being sprayed over the articles and the gas mixture circulated through the articles. The cieculating gas mixture brings about an intense mixing and cooling effect inside the chamber 24 on the water which is sprayed over the articles and flows downwards through them, so that all ~arts of the articles will be cooled evenly and rapidly.
When the articles are cooled to the desired temperature the pump 16 and the impeller 34 are stopped and the valves 50 and 52 are closed, after which the water is discharged through a valve 60 and the pressure by opening of a valve 54. The vessel can then be opened and the heat treated, e.g. sterilized, articles be taken out.
During the whole process the desired pressure in the vessel is controlled by supplying sterile compressed air through a valve 56 or by discharging gaseous medium through the valve 54.
Tests have been made which show the difference in result between the two said known methods and the method according to the inventionO The chamber 24 is an arrangement accoring to the drawing was filled with glass 1~2~6~
packages 26. The temperature Tl, T2 and T3 were measured in three different packages.
The first known method described in the description was carried out on the packages. The impeller 34 was standing still while the pump 16 was running, spraying water over the packages. Heating was effected by steam only from the steam inlet 38. Cooling was effected by the heat exchanqer 18 only. The result is evident from Table 1.
Without moving the packages in the chamber 24 the second known method described in the description was carried out on the packages. The pump 16 was standing still while the impeller 34 was running and circulated gaseous medium between the packages. Heating was effected by steam only from the steam inlet 38. Cooling was effected by the heat exchangers 32 only. The result is evident from Table 20 The packages were furthermore subjected to the method according to the invention. The pump 16 as well as the impeller 34 were running. ~eating was effected by steam only from the steam inlet 38. Cooling was effected by as well the heat exchanger 18 as by the heat exchangers 32.
The result is evident from Table 3.
. .
? 2 2 ~? ~? ~
.: Cl rClIIA~ t Wl~
Tim~ ~1 T2 r3 m5n., 3~7C- C C C
0 00 42 ? 1 37,0 36 6 He~tlng 2'~0~ 84,9 90,4 84 7 4 '00~ 113,4 118,0 114,5 6'00~ 127,5 12~,7 127,9 6'00~ 127,5 12~,7 127,g Sterllizlng7700~ 127,8 127,9 127,8 ~'o~r 127,9 12~,0 127,9 ~-~on 127,S 128,0 127,9 Coollng g 00 IOQ,6 97,5 98,2 109~0~ 7~,1 74,2- 74,2 11 45 4890 47,6 4;?~5 T~bl~ 2. Circ~l~um only Time Tl T2 T3 mln., sec. oc oc oc 0'0~" 36,0 2~,7 35,8 He~tin I'00" 94,5 89,6 88,8 9 2'00" 123,~ 121,9- 119,6
2'~0" 129~0 128,a 127,2 2'30* 129,0 128,~ 127,2 Ster~tlzlng7'30" 128,0 12a,Q 127,7 4'30" 128,1 128,0 12779 4 30 12~,1 128 ? 0 127 ? 9 Co~ling 5'30" 90,4 a9,0 9~,3 9'~0" 67,2 52,7 65,5 13'15" 49,5 34,5 45,7 56~
Tnbl~ oth clrcul~tlng w~t~rnnd _rculntln~ qaR~ou~ m~dlum Tlmo T1 T2 T~
mln.l 8~1~. C C C
0 00 ~7,5 ~5,0 ~6D4 2'00~ 79,4 78,0 78,5 H~tlng 4'00" 110,5 110,0 109,B
6'00n ~2a,0 127,8 127,~
6'00~ ,0 127,~ 127,a Sterlll 2 Ing 7'00" 127,~ 127, a 127 9 ~'00~ 127,8 127,8 127 ~700" 127,8 127,fl 127,B
9'0Q~ lD0,2 9790 9~,1 Csoling lO'OOn 74,2 7~,~ 73,6 11'~0" 48,~ 49,2 49,2 From the above tables it is evident that the method and the arrangement according to the invention result in that the heat treatment of the articles takes place rapidly and simultaneously homogenously, so that the articles at each moment during the treatment showe an extraordinary even temperature distribution over the whole chamber 24. All the articles reach rapidly..and ~2~
simultaneously the clesired treatment temperature during the heating without any part of the articles lagging in temperature respect, which would imply a harmful under-treatment of this part of the articles during the S subsequent heat treatment. After that, all the articles keep at the desired treatment temperature without any part being neither colder nor warmer, which would be harmful to the treatment result. During the cooling the temperature of the articles sinks rapidly and simultaneously with the advantaye that no part of the articles is staying at a higher temperaturee, which would im~ly a harmful over-treament of the articles.
A cause contributing to the even temperature distribution during the heating is that the articles then are exposed to warm medium from two directions simultaneously, vi~. partly by warm gas mixture which flows upwards through the articles from below and is cooled by the articles on its way upwards through the articles, and partly by warm water which flows downwards through the articles from above and is cooled by the articles on its way downwards through them.
A cause contributing to the even temperature - distribution during the cooling is that the articles then are exposed to cold medium from two directions simultaneously, viz. partly by cold gas mixture, cooled by the heat exchanqers 32, which qas mixture flows upwards throuqh the articles from below and is heated by the articles on its way upwards through them and partly by cold water, cooled by the heat exchanger 18, which water flows downwards throuqh the articles from above and is heated by the articles on its way downwards throuqh the them.
Besides being applicable to sterlization the invention is also with advantaqe applicable to other kinds of heat treatments in order to kill micro-orqanisms, e.g.
pasteurizing and tyndalizinq.
Tnbl~ oth clrcul~tlng w~t~rnnd _rculntln~ qaR~ou~ m~dlum Tlmo T1 T2 T~
mln.l 8~1~. C C C
0 00 ~7,5 ~5,0 ~6D4 2'00~ 79,4 78,0 78,5 H~tlng 4'00" 110,5 110,0 109,B
6'00n ~2a,0 127,8 127,~
6'00~ ,0 127,~ 127,a Sterlll 2 Ing 7'00" 127,~ 127, a 127 9 ~'00~ 127,8 127,8 127 ~700" 127,8 127,fl 127,B
9'0Q~ lD0,2 9790 9~,1 Csoling lO'OOn 74,2 7~,~ 73,6 11'~0" 48,~ 49,2 49,2 From the above tables it is evident that the method and the arrangement according to the invention result in that the heat treatment of the articles takes place rapidly and simultaneously homogenously, so that the articles at each moment during the treatment showe an extraordinary even temperature distribution over the whole chamber 24. All the articles reach rapidly..and ~2~
simultaneously the clesired treatment temperature during the heating without any part of the articles lagging in temperature respect, which would imply a harmful under-treatment of this part of the articles during the S subsequent heat treatment. After that, all the articles keep at the desired treatment temperature without any part being neither colder nor warmer, which would be harmful to the treatment result. During the cooling the temperature of the articles sinks rapidly and simultaneously with the advantaye that no part of the articles is staying at a higher temperaturee, which would im~ly a harmful over-treament of the articles.
A cause contributing to the even temperature distribution during the heating is that the articles then are exposed to warm medium from two directions simultaneously, vi~. partly by warm gas mixture which flows upwards through the articles from below and is cooled by the articles on its way upwards through the articles, and partly by warm water which flows downwards through the articles from above and is cooled by the articles on its way downwards through them.
A cause contributing to the even temperature - distribution during the cooling is that the articles then are exposed to cold medium from two directions simultaneously, viz. partly by cold gas mixture, cooled by the heat exchanqers 32, which qas mixture flows upwards throuqh the articles from below and is heated by the articles on its way upwards through them and partly by cold water, cooled by the heat exchanger 18, which water flows downwards throuqh the articles from above and is heated by the articles on its way downwards throuqh the them.
Besides being applicable to sterlization the invention is also with advantaqe applicable to other kinds of heat treatments in order to kill micro-orqanisms, e.g.
pasteurizing and tyndalizinq.
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Method for heat treatment of articles which are placed in a chamber in a pressure vessel, heat being supplied to and heat being removed from, respectively, the articles via water circulation circuit and sprayed over the articles, which water during a heating period is heated by steam being introduced into the vessel and during a cooling period cooled by a first heat exchanger in the circulation circuit, characterized in that simultaneously as the water is sprayed over the articles and flows downwards through them gaseous medium in the vessel is forced to flow upwards throught the articles.
2. Method according to Claim 1, characterized in that during the cooling period the gaseous medium is brought to be cooled by a second heat exchanger.
3. Method according to Claim 1 or 2, characterized in that the flows of water and gaseous medium are activated simultaneously during the heating period and a holding period at a treament temperature as well as during the cooling period.
4. Apparatus heat treating articles comprising a pressure vessel defining a chamber for containing articles, a closed circulation cirucit for water including a bottom outlet in the pressure vessel, a pump, a first heat exchanger and nozzles which spray water over articles in the chamber, and means for supplying steam to the vessel, characterized in that an impeller is arranged in the vessel for generating a forced circulating flow of gaseous medium through the articles in countercurrent to the water flowing downwards through the articles and that means are arranged for drving the impeller and the pump simultaneously.
5. Arrangement according to Claim 4, characterized in that a second heat excharger is arranged in the vessel in the circulation path for cooling the gaseous medium during the cooling period.
6. Arrangement according to Claim 5, characterized by a first means, which is arranged, on starting the heat treatment, simultaneously to start the pump, the impeller and the steam supply, and a second means, arranged when a desired treatment temperture has been reached, to give a signal to a timer to start, which timer after a certain desired holding time at the treatment temperature is arranged to cut off the steam supply.
7. Arrangement according to Claim 6, characterized in that the timer is arranged, after said holding time, to initiate supply of cooling medium to the first and the second heat exchanger so that the water which is sprayed over the articles and the circulating gaseous medium, respectively, are cooled.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8305139A SE450685B (en) | 1983-09-23 | 1983-09-23 | PROCEDURE AND DEVICE FOR HEAT TREATMENT OF GOODS |
| SE8305139-1 | 1983-09-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1222860A true CA1222860A (en) | 1987-06-16 |
Family
ID=20352615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000463843A Expired CA1222860A (en) | 1983-09-23 | 1984-09-24 | Method for heat treatment of articles and arrangement for carrying out the method |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4576792A (en) |
| EP (1) | EP0138789A3 (en) |
| JP (1) | JPS6090117A (en) |
| AU (1) | AU563328B2 (en) |
| CA (1) | CA1222860A (en) |
| SE (1) | SE450685B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1236960A (en) * | 1985-04-16 | 1988-05-24 | Shohei Masuhara | Method for sterilizing artificial organs and apparatus used therefor |
| EP0236575B1 (en) * | 1986-02-12 | 1989-11-15 | BBC Brown Boveri AG | Apparatus for the disinfection of liquids |
| AU597943B2 (en) * | 1986-04-07 | 1990-06-14 | Nichols, Robert L. | Instrument sterilization container |
| US5032186A (en) * | 1988-12-27 | 1991-07-16 | American Sterilizer Company | Washer-sterilizer |
| US5656248A (en) * | 1990-04-19 | 1997-08-12 | Winfield Industries Inc. | Multi-stage infectious waste treatment system |
| US5425925A (en) * | 1990-04-19 | 1995-06-20 | Winfield Industries, Inc. | Multi-stage infectious waste treatment system |
| US5360594A (en) * | 1990-04-19 | 1994-11-01 | Winfield Industries | Control system for medical waste disposal unit |
| US5118357A (en) * | 1991-03-20 | 1992-06-02 | Finishing Equipment, Inc. | Treatment fluid application and recovery apparatus and method |
| US5355901A (en) * | 1992-10-27 | 1994-10-18 | Autoclave Engineers, Ltd. | Apparatus for supercritical cleaning |
| US5364590A (en) * | 1993-05-07 | 1994-11-15 | American Sterlizer Company | Method for sterilization of objects |
| US5439643A (en) * | 1993-11-03 | 1995-08-08 | Liebert; Richard T. | Method and apparatus for terminal sterilization |
| KR0164023B1 (en) * | 1994-08-24 | 1998-12-15 | 오오쯔카 요시미쯔 | Spray-type sterilizer apparatus and sterilizing method |
| US6203756B1 (en) | 1997-12-17 | 2001-03-20 | Johnson & Johnson Medical, Inc. | Integrated cleaning sterilization process |
| US7556767B2 (en) * | 1997-12-17 | 2009-07-07 | Ethicon, Inc. | Integrated washing and sterilization process |
| US20050163655A1 (en) * | 1997-06-11 | 2005-07-28 | Szu-Min Lin | Integrated washing and sterilization process |
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| DE891355C (en) * | 1942-03-12 | 1953-09-28 | Lubecawerke G M B H | Pressure cooker with liquid filling for sterilizing filled cans |
| GB714221A (en) * | 1951-08-14 | 1954-08-25 | Pierre Matthieu Constant Dekke | Apparatus for sterilising or pasteurising food-stuffs, especially milk |
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| FR2244972B2 (en) * | 1973-09-21 | 1977-01-07 | Lagarde Ets Joseph | |
| DE2363468A1 (en) * | 1973-12-20 | 1975-07-03 | Oskar Neiss | Heat sterilising foodstuffs in sealed containers - using satd. steam, and non-condensible gases as pressure compensators |
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| AT348685B (en) * | 1977-04-01 | 1979-02-26 | Ver Edelstahlwerke Ag | STERILIZER FOR INFUSION SOLUTIONS FILLED IN CONTAINERS OR DGL. |
| DE2729776C3 (en) * | 1977-07-01 | 1980-03-27 | C. Stiefenhofer Kg, 8000 Muenchen | Device for cooling sterilized filled containers |
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| US4447399A (en) * | 1981-05-07 | 1984-05-08 | Mdt Chemical Company | Combination steam and unsaturated chemical vapor sterilizer |
-
1983
- 1983-09-23 SE SE8305139A patent/SE450685B/en not_active IP Right Cessation
-
1984
- 1984-09-05 AU AU32733/84A patent/AU563328B2/en not_active Ceased
- 1984-09-17 EP EP84850274A patent/EP0138789A3/en not_active Withdrawn
- 1984-09-17 JP JP59192732A patent/JPS6090117A/en active Pending
- 1984-09-17 US US06/650,847 patent/US4576792A/en not_active Expired - Fee Related
- 1984-09-24 CA CA000463843A patent/CA1222860A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| SE8305139L (en) | 1985-03-24 |
| AU3273384A (en) | 1985-03-28 |
| JPS6090117A (en) | 1985-05-21 |
| SE8305139D0 (en) | 1983-09-23 |
| US4576792A (en) | 1986-03-18 |
| SE450685B (en) | 1987-07-20 |
| EP0138789A3 (en) | 1986-10-08 |
| EP0138789A2 (en) | 1985-04-24 |
| AU563328B2 (en) | 1987-07-02 |
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