WO1997018343A1 - Procede et dispositif de sterilisation, de desodorisation et de protection de la surface interne de recipients et tubes - Google Patents
Procede et dispositif de sterilisation, de desodorisation et de protection de la surface interne de recipients et tubes Download PDFInfo
- Publication number
- WO1997018343A1 WO1997018343A1 PCT/CH1996/000406 CH9600406W WO9718343A1 WO 1997018343 A1 WO1997018343 A1 WO 1997018343A1 CH 9600406 W CH9600406 W CH 9600406W WO 9718343 A1 WO9718343 A1 WO 9718343A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- container
- tube
- plasma
- discharge
- flow
- Prior art date
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
- A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
- A61L2/14—Plasma, i.e. ionised gases
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/04—Coating on selected surface areas, e.g. using masks
- C23C16/045—Coating cavities or hollow spaces, e.g. interior of tubes; Infiltration of porous substrates
Definitions
- the present invention relates to a process for sterilization (disinfection), deodorization and protection of the internal surface of containers and tubes, as well as the device for implementing the process. It relates to the field of plasma and activated gas technologies and can be used in particular in the treatment processes (sterilization, cleaning, deodorization, pickling, creation of barrier layers and protective layers) of interior surfaces of containers and tubes. in various materials (glass, polymers, etc.) and is applicable in particular in the food, pharmacological, medical, chemical and electrical industries.
- a method of sterilizing bottles is known by treating their inner surface using aqueous solutions of basic products and the like. This process is described in the document "Heutiger Stand des Tech i s im Nassteil für Abfullstrom", A Kneissl, Brauwelt, N 15/16 (1995). p. 730-737. This process is distinguished by its high productivity and is carried out on an industrial scale. Its disadvantage is that it may not completely destroy pathogenic microorganisms (especially in the form of spores), and also that it is unable to completely deodorize the treated surfaces, which means that, after treatment, odors and specific tastes are transmitted to the new contents of the container, these tastes and odors being identified using control means and specialized devices. As containers with a residual odor are considered as waste, they are thrown away. The economic losses can be great.
- the aim of the present invention is to remedy these problems by proposing a method based on the method of activation and surface modification proposed in Swiss patent application no. 3207/95 by the applicant filed on November 13, 1995 and entitled “Process of surface treatment and device for implementing the process ".
- the invention relates to a process for sterilization (disinfection), cleaning, deodorization and protection of the internal surface of containers or tubes by treating their internal surface using a convective flow or diffusion of activated particles, generated by plasma, in which the treatment of each container or tube is carried out by the introduction of a flow of plasma into each container or tube.
- the plasma flow acting on the inner wall of the container or the tube can be arranged:
- chemical components are added to the plasma flow acting on the interior wall of the container or of the tube so as to cause, after activation of the surface, the creation of a layer of materials whose composition corresponds to the chemicals added to the plasma, this layer representing an additional barrier for gases coming from outside or inside the container or the tube or a chemical protection of the material of the container or the tube.
- the action of the plasma on the interior surface of the container or of the tube is added by the action of an alternating electric current, in particular of high frequency, the density vector of which is directed at an angle other than zero with respect to the treated surface.
- a micro-plasmotron arranged to generate a plasma of argon and / or oxygen, allowing by a relative movement of the container and the micro-plasmotron to sweep the whole surface inside the container with the plasma jet.
- a liquid-cooled tube arranges so that a plasma jet, coming from an autonomous plasma generator, penetrates into the container or the tube and, thanks to a deflector of and, and has a movement relative of the container with respect to the tube, sweeps the entire interior surface of the container.
- the tube through which the and plasma is introduced into the container or the tube is constructed of dielectric material, and in that along this tube, at different heights, are arranged annular electrodes connected to a high current source voltage, causing a non-autonomous discharge in the plasma flow.
- the solution proposed by the present invention consists in treating individually or in groups each container or tube with substances activated by a plasma, this treatment being carried out either with the use of a low vacuum beforehand, either at atmospheric pressure or at pressure. sub ⁇ atmospheric. It allows plasma treatment to be easily integrated into technological processes for cleaning and individual filling of containers or tubes.
- the advantages of plasma treatment are the destruction of microorganisms, whatever they are, including spores, and the decomposition of complex molecules, sources of unwanted odors, into simple elements, such as water or carbon dioxide, and this, not only on the surface but inside the first few atomic layers, the formation of barrier layers, obstructing gases coming from inside or outside the container or tube, or representing chemical protection container or tube material.
- FIG. 2 illustrates the results of the chromatographic study of the influence of treatment with HF plasma type "capacity" of PET bottles, the concentration of aromatic molecules being indicated in the form of gray vertical bars before treatment. We see that the concentration of Limonene molecules is reduced by more than an order of magnitude after treatment.
- a flow of activated particles (radicals, excited atoms, excited molecules) is created from multiphase flows composed of gases, liquid and / or solid particles in a specially chosen source of plasma, located either inside the vessels or tubes to be treated, either outside. Thanks to forced convection and diffusion, these particles reach the internal surface of the container or tube and carry out disinfection, cleaning, pickling, sterilization, deodorization by oxidation, and destruction of organic matter which therein, in particular microorganisms, as well as possibly the covering with a barrier layer or a protective layer.
- the particles activated in this plasma duly chosen, and projected onto the wall to be treated with a sufficient flux density, at a high temperature, create thermal fluxes causing the ablation of the surface, its surface pickling as well as polishing of the micro-relief.
- the aromatic molecules which were impregnated in the solid structure of the treated surface are therefore in these cases taken away at the same time as the stripping (polishing, ablation) and disinfection residues.
- Table 1 shows that, after treatment, the density of microorganisms (Saccharomyces cerevisiae, streptococcus + Lactobacilli) on the inner surface of PET bottles initially of 3.10 ⁇ per bottle, i.e. 10 per 3 mm2 spots is reduced to zero on the full height of the bottle.
- microorganisms Sacharomyces cerevisiae, streptococcus + Lactobacilli
- FIG. 2 is the result of the chromatographic study of the molecular composition on the interior surface of PET bottles before and after plasma treatment of the "capacity" type. We see, among other things, that the concentration of aromatic molecules of Limonene, specially introduced on the interior surface of the bottle, is reduced by an order of magnitude after plasma treatment. Table 1
- Figure 4 illustrates a second possibility of carrying out the method and the device according to the invention.
- 1 container; 2: quartz tube; 3: electrodes; 4: discharge (plasma); Tp: transformer 220/10000, three-phase; L: inductivity; C: capacity
- FIG. 4 illustrates a second possibility of carrying out the method and the device according to the invention.
- the electrodes 3 is organized a discharge of spark at atmospheric pressure.
- this discharge generates intense ultraviolet radiation of short wavelength. This helps to destroy the microorganisms on the surface to be treated and to transform organic matter.
- Figure 5 illustrates a third possibility of realization of the method and the device according to the invention.
- 1 container; 2: metal or quartz tube; 3: electrodes; 4: discharge (plasma); 5: direct current source, 10 KV
- Figure 6 (or the reference signs respectively relate to: 1: container; 2: metal or quartz tube; 3: electrodes; 4: discharge (plasma); 5: direct current source, 10 kV) illustrates a fourth possibility of realization of the method and the device according to the invention.
- the container is filled with oxygen. A flow of oxygen ventilates it via the tube 2.
- the metal tube 2 is supplied by a high frequency generator. In the container is created a high-frequency discharge of type E (condenser) at atmospheric pressure.
- the electric current is distributed over the entire interior volume of the container, which increases the processing speed. An increase in the processing speed can be obtained by virtue of the fact that the treated container is immersed in water. In this case, the streamlines close over the entire interior surface of the container, as shown in Figure 5.
- Figure 7 shows another possibility of carrying out the process and the device according to the invention.
- the container is placed under a low vacuum (P -_ 1 millibar).
- P -_ 1 millibar The distance between the electrodes is less than the size of the cathode zone for the given pressure and gas. Between these electrodes is organized a calm discharge. This discharge is characterized by the fact that the electric current passes through the external surface of the electrodes and is distributed uniformly throughout the volume of the container.
- Figure 8 illustrates a sixth possibility for carrying out the claimed invention.
- the container is submerged in water (or is sprayed with water).
- the slightly conductive water is earthed.
- the container is filled with metallic bodies in contact with each other (for example, a metal link chain can be used for this purpose).
- This metallic medium is put under high voltage.
- On the inner surface of the container appears a barrier discharge. In the latter is generated ozone (O3), if oxygen is introduced into the container through the tube 2.
- O3 ozone
- An intense radiation of ultraviolet rays also appears in the case of the presence of argon in the container.
- Figure 9 illustrates a seventh possibility of producing the device according to the invention.
- the dielectric tube 2 On the dielectric tube 2 is wound a spiral made of a metal tube of small diameter h, the space between the winding 4 and the tube 2 is 3 mm and the pitch of the spiral is 5 mm.
- the tubes are cooled with water.
- Tubes 3 and 4 are placed under high alternating voltage ( ⁇ 10 kV). Between the dielectric tube 2 and the tube 4 is generated a barrier discharge. When oxygen is blown through the container, the discharge generates an active oxidant, ozone. In the presence of argon, intense ultraviolet radiation appears. The two factors cause the sterilization of the internal wall of the container and its cleaning of organic matter.
- Figure 10 illustrates another possible embodiment of the device according to the invention.
- the container is crossed by ozone, generated externally by a barrier discharge or another type of discharge, so as to have uniform contact with the flow of the oxidizing gas. Oxidation causes effective disinfection and deodorization of the interior wall of the container.
- Figure 11 illustrates a ninth variant of the device according to the invention.
- a microplasmotron is introduced into the container. It generates a jet of oxygen plasma, at atmospheric pressure, created either by an arc discharge, or by a high voltage alternating current discharge.
- the jet projects on the interior wall of the container a flow of activated particles (0, 0 *, 0 * 2 / ° 3) which, attacking the wall treated by forced convection and diffusion, sterilize, clean, destroy organic matter superficially, deodorize locally the inner wall of the container.
- a relative movement of the micro-plasmotron and the wall of the container makes it possible to treat the interior surface of the container entirely.
- FIG. 12 illustrates a tenth possibility of making the device according to the invention.
- a plasma jet is formed outside the treated container.
- the plasma is introduced to the inside of the container using a tube which can be cooled. Once out of the tube, the plasma jet is reformed by a system of deflectors and openings so that the plasma can effectively reach all regions of the interior surface of the container.
- the reaction products are evacuated by ventilation along the introduction tube.
- a cold air (or other gas) ventilation system can be organized as shown in Figure 13 (where the reference signs relate respectively: 1: container; 2: plasma jet generator; 3: plasma jet; 4: cooling water supply; 5: gas supply, for example Ar, 0; 6: electric current supply; 7: cooled tube; 8: deflector; 9: central plasma jet; 10: lateral plasma jet; 11: forced ventilation system), to more effectively drive the plasma flow inside the container.
- the plasma introduction tube is made of metal or insulating material, for example quartz. In the latter case, the addition of two electrodes, placed on
- FIG. 14 An example of such a solution is illustrated in FIG. 14 (where the reference signs relate respectively: 1: container; 2: generator of a plasma jet; 3: plasma jet; 4: supply of cooling water; 5: gas supply, for example Ar, O; 6: electric current supply; 7: cooled dielectric tube, for example quartz; 8: deflector; 9: central plasma jet; 10: lateral plasma jet, 11: forced ventilation system; 12: annular electrodes; 13: direct current or alternating high voltage source, 10 kV).
- FIG. 15 illustrates an eleventh embodiment of the invention for the generation of a plasma by HF discharge with introduction for the treatment of the internal surface of a PET bottle ("a") and of a tube made of polymeric material ("b”), where the reference signs relate respectively to: 1.
- the walls of the treated container or tube serve as an enclosure for the generation of a high frequency induction plasma due to the passage of a high frequency current through the turns of an external inductor coaxial to the container or the treated tube.
- Plasma is formed in the uniphasic or multiphasic substance injected inside the container or the tube to initiate, form and stabilize it.
- the plasma particles which reach the wall of the container or the tube carry out the treatment there which, according to their physico-chemical nature, is a disinfection, a cleaning, a pickling or a layer deposition.
- FIG. 16 illustrates another alternative embodiment of the invention for the generation of a plasma by HF discharge of the "capacity" type for the treatment of the internal surface of a PET bottle ("a") and of a tube in polymeric material ("b"), where the reference signs relate respectively to: 1. container; 2: tube; 3: current source; 4: central electrode; 5: flow rate of the injected substance; 6: streamlines; 7: peripheral electrode; 8: plasma.
- the walls of the container or of the treated tube serve as enclosure for the generation of a high frequency plasma of the "capacity” type formed by the passage of a high frequency current through the interior volume of the container or of the tube to be treated.
- the treatment which, depending on the nature of the substance injected inside the container or the tube consists of disinfection, cleaning, pickling or depositing of film, is due not only to the access of the particles of the plasma. to the treated surface, but to electron bombardment of this surface.
- FIG. 17 where the reference signs relate respectively: 1.
- the plasma generated inside the container or tube to be treated is an HF plasma of the "torch" type, the generation of which requires only the presence of an electrode, the role of the second electrode being heard by surrounding objects, in contact with the earth.
- an initiating substance injected inside the container or the tube, forms and stabilizes the discharge. Cleaning, disinfection, pickling and film deposition treatments are possible depending on the nature of the initiating substance injected.
- the external plasma can be of the "induction”, “capacity” or “torch” type.
- Figure 18 illustrates the case of a "capacity" type plasma, activated simultaneously with the interior plasma.
- a "capacity" type plasma activated simultaneously with the interior plasma.
- outside the added wall is a peripheral electrode.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- Materials Engineering (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
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- Veterinary Medicine (AREA)
- Apparatus For Disinfection Or Sterilisation (AREA)
- Cleaning In General (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96934318A EP0862663A1 (fr) | 1995-11-13 | 1996-11-13 | Procede et dispositif de sterilisation, de desodorisation et de protection de la surface interne de recipients et tubes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH321295 | 1995-11-13 | ||
CH3212/95 | 1995-11-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997018343A1 true WO1997018343A1 (fr) | 1997-05-22 |
Family
ID=4251080
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH1996/000406 WO1997018343A1 (fr) | 1995-11-13 | 1996-11-13 | Procede et dispositif de sterilisation, de desodorisation et de protection de la surface interne de recipients et tubes |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0862663A1 (fr) |
WO (1) | WO1997018343A1 (fr) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001056706A1 (fr) * | 2000-02-01 | 2001-08-09 | Tetra Laval Holdings & Finance S.A. | Dispositif de revetement de la surface interieure d'un corps creux |
FR2807912A1 (fr) * | 2000-04-17 | 2001-10-19 | Lasers Et Tech Avancees Bureau | Procede et torche a plasma pour traiter une surface dans une cavite, et installation de remplissage bouchage s'y rapportant |
GB2364914A (en) * | 2000-07-26 | 2002-02-13 | Jacques Protic | Sterilisation |
EP2551374A1 (fr) * | 2011-07-29 | 2013-01-30 | Jokey Plastik Sohland GMBH | Procédé de génération d'un revêtement empêchant la perméation pour récipients en plastique et installation de revêtement |
DE102012201955A1 (de) * | 2012-02-09 | 2013-08-14 | Krones Ag | Powerlanze und plasmaunterstützte Beschichtung mit Hochfrequenzeinkopplung |
US10194672B2 (en) | 2015-10-23 | 2019-02-05 | NanoGuard Technologies, LLC | Reactive gas, reactive gas generation system and product treatment using reactive gas |
US10925144B2 (en) | 2019-06-14 | 2021-02-16 | NanoGuard Technologies, LLC | Electrode assembly, dielectric barrier discharge system and use thereof |
US11896731B2 (en) | 2020-04-03 | 2024-02-13 | NanoGuard Technologies, LLC | Methods of disarming viruses using reactive gas |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3383163A (en) * | 1964-01-24 | 1968-05-14 | Little Inc A | Treatment of surfaces |
WO1993024243A1 (fr) * | 1992-05-28 | 1993-12-09 | Polar Materials, Inc. | Procedes et dispositif de depot de couches d'arret |
WO1995020688A1 (fr) * | 1994-01-26 | 1995-08-03 | Neomecs Incorporated | Modification au plasma de la surface de lumiere d'un tube artificiel |
WO1995022413A1 (fr) * | 1994-02-16 | 1995-08-24 | The Coca-Cola Company | Recipients creux a revetement interieur inerte ou impermeable applique par reaction superficielle au plasma ou polymerisation superficielle |
-
1996
- 1996-11-13 WO PCT/CH1996/000406 patent/WO1997018343A1/fr not_active Application Discontinuation
- 1996-11-13 EP EP96934318A patent/EP0862663A1/fr not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3383163A (en) * | 1964-01-24 | 1968-05-14 | Little Inc A | Treatment of surfaces |
WO1993024243A1 (fr) * | 1992-05-28 | 1993-12-09 | Polar Materials, Inc. | Procedes et dispositif de depot de couches d'arret |
WO1995020688A1 (fr) * | 1994-01-26 | 1995-08-03 | Neomecs Incorporated | Modification au plasma de la surface de lumiere d'un tube artificiel |
WO1995022413A1 (fr) * | 1994-02-16 | 1995-08-24 | The Coca-Cola Company | Recipients creux a revetement interieur inerte ou impermeable applique par reaction superficielle au plasma ou polymerisation superficielle |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001056706A1 (fr) * | 2000-02-01 | 2001-08-09 | Tetra Laval Holdings & Finance S.A. | Dispositif de revetement de la surface interieure d'un corps creux |
FR2807912A1 (fr) * | 2000-04-17 | 2001-10-19 | Lasers Et Tech Avancees Bureau | Procede et torche a plasma pour traiter une surface dans une cavite, et installation de remplissage bouchage s'y rapportant |
WO2001080607A1 (fr) * | 2000-04-17 | 2001-10-25 | Steriplasma | Procede et torche a plasma pour traiter une surface dans une cavite, et installation de remplissage-bouchage s'y rapportant |
GB2364914A (en) * | 2000-07-26 | 2002-02-13 | Jacques Protic | Sterilisation |
GB2364914B (en) * | 2000-07-26 | 2002-07-24 | Jacques Protic | A sterilisation process and apparatus therefor |
EP2551374A1 (fr) * | 2011-07-29 | 2013-01-30 | Jokey Plastik Sohland GMBH | Procédé de génération d'un revêtement empêchant la perméation pour récipients en plastique et installation de revêtement |
DE102012201955A1 (de) * | 2012-02-09 | 2013-08-14 | Krones Ag | Powerlanze und plasmaunterstützte Beschichtung mit Hochfrequenzeinkopplung |
US10194672B2 (en) | 2015-10-23 | 2019-02-05 | NanoGuard Technologies, LLC | Reactive gas, reactive gas generation system and product treatment using reactive gas |
US11000045B2 (en) | 2015-10-23 | 2021-05-11 | NanoGuard Technologies, LLC | Reactive gas, reactive gas generation system and product treatment using reactive gas |
US11882844B2 (en) | 2015-10-23 | 2024-01-30 | NanoGuard Technologies, LLC | Reactive gas, reactive gas generation system and product treatment using reactive gas |
US10925144B2 (en) | 2019-06-14 | 2021-02-16 | NanoGuard Technologies, LLC | Electrode assembly, dielectric barrier discharge system and use thereof |
US11896731B2 (en) | 2020-04-03 | 2024-02-13 | NanoGuard Technologies, LLC | Methods of disarming viruses using reactive gas |
Also Published As
Publication number | Publication date |
---|---|
EP0862663A1 (fr) | 1998-09-09 |
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