EP0159302B1 - Method and arrangement for heat treatment of a medium enclosed in a receptacle - Google Patents
Method and arrangement for heat treatment of a medium enclosed in a receptacle Download PDFInfo
- Publication number
- EP0159302B1 EP0159302B1 EP19850850115 EP85850115A EP0159302B1 EP 0159302 B1 EP0159302 B1 EP 0159302B1 EP 19850850115 EP19850850115 EP 19850850115 EP 85850115 A EP85850115 A EP 85850115A EP 0159302 B1 EP0159302 B1 EP 0159302B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- receptacle
- medium
- tray
- liquid medium
- vessel
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B55/00—Preserving, protecting or purifying packages or package contents in association with packaging
- B65B55/02—Sterilising, e.g. of complete packages
- B65B55/027—Packaging in aseptic chambers
Definitions
- the invention relates to a method to heat and after that cool a first liquid medium in a pressure vessel by means of a second liquid medium, the first liquid medium being enclosed in a receptacle to a certain level above which a gaseous medium is enclosed in the receptacle, said second liquid medium being brought into contact with the outside of the receptacle and reaching temperatures at which the material of the wall of the receptacle becomes soft and strives at being deformed permanently by the gas pressure and the hydrostatic pressure of the media in the receptacle.
- the invention also relates to an arrangement for carrying out the method to heat and after that cool a first liquid medium in a pressure vessel by means of a second liquid medium, the first liquid medium being enclosed in a receptacle to a certain level above which a gaseous medium is enclosed in the receptacle, said second liquid medium being brought into contact with the outside of the receptacle.
- FR-A-1 325 455 which discloses a method and an arrangement of the kinds introductorily set forth shows an attempt to prevent said deformation by immersing a receptacle to be sterilized in a liquid to thereby balance the hydrostatic pressure acting inside the receptacle.
- the receptacle is, however, completely immersed in the liquid when the sterilizing temperature is reached which means that the hydrostatic pressure outside the top part of the receptacle, which contains a gaseous medium, compresses and deforms that part of the receptacle.
- the object of the invention is to substantially prevent deformation on all parts of the receptacle when it is heated and cooled with its liquid and gaseous media contents.
- the second medium surrounds the receptacle to such a level that the hydrostatic pressure on both sides of the wall of the receptacle equalize each other, and at least when the material of the wall of the receptacle has said temperatures the gas pressure in the vessel outside the receptacle is kept equal to the gas pressure inside the receptacle, and by the arrangement according to the invention thereby that the vessel contains at least one tray on the bottom of which one or more receptacles are intended to be placed, each tray being filled with said second liquid medium to such a level that the hydrostatic pressures on both sides of the wall of the receptacle equalize each other, and by means for keeping the gas pressure in the vessel outside the receptacle equal to the gas pressure inside the receptacle.
- By 10 is designated a closeable pressure vessel, in which two trays 12 and 14 are enclosed. Each tray is provided with a bottom 16, side walls 18 and a spillway 20 in the form of a pipe 21. In the respective tray a plurality of receptacles in the form of bottles 22 made of polyethylene are placed on a bottom plane 24. The bottles contain a liquid to a certain level 26.
- the bottles 22 are heat treated by water circulated through the pressure vessel 10 by a pump 28 which pumps water collected on the bottom of the vessel through a heat exchanger 30 which heats the water, after which the water is sprayed onto the bottles in the upper tray 12 through nozzles 32. Openings 34 in the bottom of the tray 12 let out a part of the water but also see to it that the water in the tray rises to the level 36 of the spillway 20, which lets out the rest of the water supplied through the nozzles 32.
- steam can be introduced through a valve 34 into the vessel 10 to heat the circulating water.
- the object of the spillway 20 is to keep such a level 36 outside the bottles 22 that the hydrostatic pressures on both sides of the wall 38 of the bottle substantially equalize each other and substantially counteract the deformation, which the liquid in the bottle would have caused on the wall of the bottle if there had not been any liquid level on the outside of the bottle.
- infusion solution i.e. a solution of medicaments in water, which solution has substantially the same density as water
- infusion solution i.e. a solution of medicaments in water, which solution has substantially the same density as water
- the level 36 of the water was kept equal to the level 26 of the infusion solution.
- Grooves 40 were arranged in the bottom plane 24 to let in water under the convex bottom 42 of the bottle. The convex bottom 42 also maintained its form during the heat treatment.
- the lower tray 14 is similar to and works in the same way as the upper tray 12.
- the tray 14 is supplied with heat treating liquid from the upper tray 12.
- the level 36 is kept substantially equal to the level 26. If the liquid in the bottles has a larger density than the heat treating liquid, the level 36 is suitably kept higher than the level 26, and if the liquid in the bottles has a smaller density than the heat treating liquid, the level 36 is suitably kept lower than the level 26 so that the deformation of the bottles shall become as small as possible.
- the bottles are cooled, suitably thereby that water, cooled by the heat exchanger 30, is circulated through the vessel 10 via the nozzles 32.
- a gaseous medium In the part 46 of the bottle, which is located above the level 26, a gaseous medium is enclosed, which strives to expand and thereby deform the bottle when the temperature rises. This expansion and deformation is counteracted by pressure air, which is introduced into the vessel 10 through a valve 48, such that the pressure in the vessel 10 is kept equal to the pressure in the part 46. Air and steam can be let out of the vessel 10 through another valve 50, such that the pressure in the vessel 10 does not become larger than the pressure in the part 46, in which case the bottle would be squeezed.
Description
- The invention relates to a method to heat and after that cool a first liquid medium in a pressure vessel by means of a second liquid medium, the first liquid medium being enclosed in a receptacle to a certain level above which a gaseous medium is enclosed in the receptacle, said second liquid medium being brought into contact with the outside of the receptacle and reaching temperatures at which the material of the wall of the receptacle becomes soft and strives at being deformed permanently by the gas pressure and the hydrostatic pressure of the media in the receptacle.
- The invention also relates to an arrangement for carrying out the method to heat and after that cool a first liquid medium in a pressure vessel by means of a second liquid medium, the first liquid medium being enclosed in a receptacle to a certain level above which a gaseous medium is enclosed in the receptacle, said second liquid medium being brought into contact with the outside of the receptacle.
- It is known to sterilize a liquid in a receptacle of polyethylene plastic in an autoclave by heating the outside of the receptacle, and thereby the liquid, by means of a heated liquid, which is sprayed onto the receptacle. Such a receptacle can be heated to maximally about 110°C. At a higher temperature the plastic becomes so soft that the receptacle loses its form completely.
- Already before the receptable reaches 110°Cthe plastic begins to soften, which results in that the hydrostatic pressure in the receptacle deforms the receptacle. An originally cylindric, standing receptacle will after treating to 110°C get a conical form, which becomes wider at the bottom. The bottom of the receptacle will also form after the bed, on which the receptacle stands.
- FR-A-1 325 455 which discloses a method and an arrangement of the kinds introductorily set forth shows an attempt to prevent said deformation by immersing a receptacle to be sterilized in a liquid to thereby balance the hydrostatic pressure acting inside the receptacle. The receptacle is, however, completely immersed in the liquid when the sterilizing temperature is reached which means that the hydrostatic pressure outside the top part of the receptacle, which contains a gaseous medium, compresses and deforms that part of the receptacle.
- The object of the invention is to substantially prevent deformation on all parts of the receptacle when it is heated and cooled with its liquid and gaseous media contents.
- This object is attained by the method according to the invention thereby that the second medium surrounds the receptacle to such a level that the hydrostatic pressure on both sides of the wall of the receptacle equalize each other, and at least when the material of the wall of the receptacle has said temperatures the gas pressure in the vessel outside the receptacle is kept equal to the gas pressure inside the receptacle, and by the arrangement according to the invention thereby that the vessel contains at least one tray on the bottom of which one or more receptacles are intended to be placed, each tray being filled with said second liquid medium to such a level that the hydrostatic pressures on both sides of the wall of the receptacle equalize each other, and by means for keeping the gas pressure in the vessel outside the receptacle equal to the gas pressure inside the receptacle.
- A method and an arrangement according to the invention are described below with reference to the accompanying drawing, which shows an embodiment of an arrangement according to the invention.
- By 10 is designated a closeable pressure vessel, in which two
trays 12 and 14 are enclosed. Each tray is provided with abottom 16,side walls 18 and aspillway 20 in the form of apipe 21. In the respective tray a plurality of receptacles in the form ofbottles 22 made of polyethylene are placed on abottom plane 24. The bottles contain a liquid to acertain level 26. - The
bottles 22 are heat treated by water circulated through thepressure vessel 10 by apump 28 which pumps water collected on the bottom of the vessel through aheat exchanger 30 which heats the water, after which the water is sprayed onto the bottles in the upper tray 12 throughnozzles 32.Openings 34 in the bottom of the tray 12 let out a part of the water but also see to it that the water in the tray rises to thelevel 36 of thespillway 20, which lets out the rest of the water supplied through thenozzles 32. - As a complement or an alternative to the
heat exchanger 30 steam can be introduced through avalve 34 into thevessel 10 to heat the circulating water. - The object of the
spillway 20 is to keep such alevel 36 outside thebottles 22 that the hydrostatic pressures on both sides of thewall 38 of the bottle substantially equalize each other and substantially counteract the deformation, which the liquid in the bottle would have caused on the wall of the bottle if there had not been any liquid level on the outside of the bottle. - On testing cylindrical polyethylene bottles containing so-called infusion solution, i.e. a solution of medicaments in water, which solution has substantially the same density as water, it has proved that the bottles substantially maintain their cylindrical form and their measures during a heat treatment up to 100°C. At the test the
level 36 of the water was kept equal to thelevel 26 of the infusion solution.Grooves 40 were arranged in thebottom plane 24 to let in water under theconvex bottom 42 of the bottle. Theconvex bottom 42 also maintained its form during the heat treatment. - The
lower tray 14 is similar to and works in the same way as the upper tray 12. Thetray 14 is supplied with heat treating liquid from the upper tray 12. - If the liquid in the bottles has substantially the same density as the heat treating liquid the smallest deformation of the bottles is obtained if the
level 36 is kept substantially equal to thelevel 26. If the liquid in the bottles has a larger density than the heat treating liquid, thelevel 36 is suitably kept higher than thelevel 26, and if the liquid in the bottles has a smaller density than the heat treating liquid, thelevel 36 is suitably kept lower than thelevel 26 so that the deformation of the bottles shall become as small as possible. - After the heat treatment the bottles are cooled, suitably thereby that water, cooled by the
heat exchanger 30, is circulated through thevessel 10 via thenozzles 32. - Instead of letting the
end 20 of thepipe 21 constitute a spillway, one can let theupper edge 44 of thetray 12, 14 constitute a spillway. - In the
part 46 of the bottle, which is located above thelevel 26, a gaseous medium is enclosed, which strives to expand and thereby deform the bottle when the temperature rises. This expansion and deformation is counteracted by pressure air, which is introduced into thevessel 10 through avalve 48, such that the pressure in thevessel 10 is kept equal to the pressure in thepart 46. Air and steam can be let out of thevessel 10 through anothervalve 50, such that the pressure in thevessel 10 does not become larger than the pressure in thepart 46, in which case the bottle would be squeezed.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8401848 | 1984-04-03 | ||
SE8401848A SE451540B (en) | 1984-04-03 | 1984-04-03 | SET AND DEVICE TO HEAT TREATMENT OF A LIQUID MEDIUM CONTAINED IN A CONTAINER |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0159302A1 EP0159302A1 (en) | 1985-10-23 |
EP0159302B1 true EP0159302B1 (en) | 1988-02-24 |
Family
ID=20355432
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19850850115 Expired EP0159302B1 (en) | 1984-04-03 | 1985-03-29 | Method and arrangement for heat treatment of a medium enclosed in a receptacle |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0159302B1 (en) |
JP (1) | JPS60228222A (en) |
AU (1) | AU571953B2 (en) |
CA (1) | CA1250403A (en) |
DE (1) | DE3561647D1 (en) |
SE (1) | SE451540B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1291092C (en) * | 1988-03-11 | 1991-10-22 | Donald A. Poole | Easy opening gable top carton |
US5242701A (en) * | 1988-10-24 | 1993-09-07 | Fbi Brands Ltd. | Method for shelf stable packaging of liquid food in hermetically sealed easy-to-open gable top cartons |
JPH0487934A (en) * | 1990-07-16 | 1992-03-19 | Hisaka Works Ltd | Method and device for retort pasturing liquid contained in plastic container and heating pasturizing tray used |
US5283033A (en) * | 1991-11-29 | 1994-02-01 | Advanced Retort Systems, Inc. | Process for sterilizing the contents of a sealed deformable package |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1325455A (en) * | 1962-06-18 | 1963-04-26 | Duschek Gmbh Alois | Method and device for the deformation-free sterilization of hermetically sealed plastic containers |
FR2288481A1 (en) * | 1974-10-24 | 1976-05-21 | Hanau Sa F | NEW METHODS AND EQUIPMENT FOR THE HEAT TREATMENT OF PRODUCTS CONTAINED IN WATERTIGHT CONTAINERS |
US4050894A (en) * | 1975-02-25 | 1977-09-27 | Mariano Rodriguez Genis | Sterilizing and sterility maintaining apparatus for dental and surgical tools and the like |
-
1984
- 1984-04-03 SE SE8401848A patent/SE451540B/en not_active IP Right Cessation
-
1985
- 1985-03-28 AU AU40472/85A patent/AU571953B2/en not_active Ceased
- 1985-03-29 DE DE8585850115T patent/DE3561647D1/en not_active Expired
- 1985-03-29 EP EP19850850115 patent/EP0159302B1/en not_active Expired
- 1985-04-02 CA CA000478169A patent/CA1250403A/en not_active Expired
- 1985-04-02 JP JP6862085A patent/JPS60228222A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE3561647D1 (en) | 1988-03-31 |
AU4047285A (en) | 1985-10-10 |
SE451540B (en) | 1987-10-19 |
SE8401848L (en) | 1985-10-04 |
CA1250403A (en) | 1989-02-28 |
JPS60228222A (en) | 1985-11-13 |
EP0159302A1 (en) | 1985-10-23 |
SE8401848D0 (en) | 1984-04-03 |
AU571953B2 (en) | 1988-04-28 |
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