EP2307061A1 - Procédé et dispositif de stérilisation et/ou de désinfection - Google Patents

Procédé et dispositif de stérilisation et/ou de désinfection

Info

Publication number
EP2307061A1
EP2307061A1 EP09776848A EP09776848A EP2307061A1 EP 2307061 A1 EP2307061 A1 EP 2307061A1 EP 09776848 A EP09776848 A EP 09776848A EP 09776848 A EP09776848 A EP 09776848A EP 2307061 A1 EP2307061 A1 EP 2307061A1
Authority
EP
European Patent Office
Prior art keywords
plasma
workpiece
sterilization
workpieces
sterilizing
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.)
Withdrawn
Application number
EP09776848A
Other languages
German (de)
English (en)
Inventor
Gernot Keil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KHS GmbH
Original Assignee
KHS GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by KHS GmbH filed Critical KHS GmbH
Publication of EP2307061A1 publication Critical patent/EP2307061A1/fr
Withdrawn legal-status Critical Current

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

Definitions

  • the invention relates to a method for sterilizing and / or sterilizing workpieces made of plastic.
  • the invention further relates to a device for sterilizing and / or sterilizing workpieces made of plastic, which has a dispensing device for at least partially applying the workpiece with a sterilization medium.
  • a device for sterilizing and / or sterilizing workpieces made of plastic which has a dispensing device for at least partially applying the workpiece with a sterilization medium.
  • Such a method may, for example, be associated with the handling of packaging materials used to package products.
  • a particularly typical application is related to the packaging and filling of food or drinks in packages provided with a closure.
  • Typical known sterilization processes are carried out using hydrogen peroxide and / or superheated steam. Although such substances lead to the achievement of very high sterility rates, the achievement of high throughput rates per time unit is subject to significant restrictions due to the required process steps.
  • a sterilization process is typically understood as a reduction of germs and / or spores by at least 6 decades, a sterilization is typically understood as a reduction of germs and / or spores by about 4 to 5 decades. Both the sterilization and the sterilization refer here to a destruction or inactivation of germs, spores and generally of microorganisms.
  • Sterilization suitable In the following, for simplification, reference is made predominantly to the sterilization, but it should be emphasized that all method steps and all device components can likewise be applied alternatively or additionally to the performance of sterilization processes.
  • the object of the present invention is to improve a method of the aforementioned type such that a reliable sterilization is supported at high throughput rates.
  • This object is achieved in that the sterilization and / or sterilization by application of a plasma is performed, which is generated in a gas that has at least approximately an ambient pressure.
  • Another object of the present invention is to construct a device of the aforementioned type such that a reliable performance of a sterilization process is supported at high throughput rates.
  • This object is achieved in that the delivery device is designed as a generator for generating a plasma having approximately an ambient pressure.
  • An approximate ambient pressure is understood in particular to mean that the pressure typically does not deviate by more than plus or minus 10% from an ambient pressure. In general, however, this also includes pressures that do not differ by more than 50% from the respective ambient pressure.
  • the use of a plasma allows an extremely reliable performance of the sterilization process, supports rapid implementation of the sterilization process and avoids additional process steps. In particular, as compared to carrying out a sterilization process using steam or vaporous media, subsequent drying operations are avoided.
  • a plasma having approximately an ambient pressure or a normal pressure can be produced with a very simple apparatus and thus inexpensive.
  • the plasma leads to an ionization of the plasma gases, which are supplied to the plasma apparatus, whereby the ionized gases possibly present germs,
  • the plasma gas contains modular oxygen, atomic oxygen is produced in particular in the case of such an ionization, which proves to be extremely effective with respect to the performance of a sterilization process.
  • the workpieces be fed to perform the sterilization process of a rotating receiving device.
  • Workpieces can be achieved in that, during the execution of the sterilization process, the workpiece is at least partially separated from segments of a sterilization process. sators whose segments are positioned by two transport wheels.
  • the workpiece be received at least in places by an outer element during the execution of the sterilization process, to which an inner element is correspondingly positioned.
  • An outside boundary of the sterilization area can be effected in that the workpiece is at least partially surrounded by the outer element like a trough.
  • the inner element is positioned at least partially vorsprungsartig in the workpiece.
  • a sterilizing medium is at least partially generated in an interior of the outer element.
  • a sterilization of an inner surface of the workpiece is assisted in that the sterilizing medium is at least partially generated in an interior of the inner element.
  • a batch operation in carrying out the sterilization process is made possible in that the segments of the sterilizer are positioned on two opposing support plates such that a plurality of outer elements fixed on one of the support plates and a plurality of inner elements on the other of the support plate and that at least one of the support plates is positioned relative to the other of the support plates positionable.
  • Reproducible sterilization conditions are supported by the fact that the
  • Sterilization process is carried out with a cyclic feed of the workpieces.
  • the achievement of high throughput rates can also be supported by the fact that the sterilization process is carried out with a continuous feed of the workpieces. According to a preferred embodiment it is provided that shutter-like workpieces are sterilized.
  • cap-like workpieces are sterilized.
  • the sterilizing effect can be increased by supplying a process gas to the plasma apparatus.
  • a first process gas is also thought to supply a second second process gas or a plurality of process gases.
  • An inexpensive and effective provision of the plasma can take place in that the plasma is ignited in the interior by the action of an electromagnetic field.
  • Targeted guidance of the plasma in the direction of the workpiece to be sterilized can take place in that a plasma flow emerges from a nozzle-like outflow opening in the direction of the workpiece.
  • the plasma flow may be generated by the flow of the at least one process gas through the plasma apparatus.
  • FIG. 1 shows a schematic cross section through a device for sterilizing caps
  • FIG. 2 shows a schematic illustration of a sterilization device with sterilization segments arranged on rotating support elements
  • FIG. 3 is a more detailed view of the device of FIG. 2,
  • FIGS. 2 and 3 shows a modification of the embodiments in FIGS. 2 and 3 of the sterilization device
  • FIG. 8 shows an enlarged schematic representation of a plasma torch emerging from an outflow opening
  • FIG. 9 shows a schematic illustration to illustrate a hollow chamber construction for plasma generation
  • FIG. 10 is a more detailed view of the inner electrode of FIG. 9,
  • FIG. 11 is an enlarged view of the detail Xl in Fig. 9, 12 shows a further illustration for the construction of a hollow chamber plasma generator,
  • FIG. 13 shows a schematic representation for illustrating a power supply of the plasma generator
  • FIG. 14 shows a schematic representation of a plasma generator with RF discharge
  • FIG. 16 shows a schematic cross section through a plasma generator with dielectric
  • FIG. 17 shows a schematic representation of an electrode arrangement
  • 19 shows a schematic representation of a plasma generator with additional supply of a reactive gas
  • Fig. 20 is a schematic representation of an evaporator for hydrogen peroxide
  • Fig. 21 is a further schematic representation of a vaporizer for hydrogen peroxide with a screw-shaped evaporator unit.
  • Fig. 1 shows a schematic cross-sectional view of a sterilizer (1), which is provided for the sterilization of cap-shaped workpieces (2).
  • workpieces (2) may be formed, for example, as caps for bottles.
  • Corresponding sterilized caps can be used, for example, for closing bottles under aseptic filling conditions, such as are realized, for example, when bottling fruit juices.
  • plastic bottles such as PET bottles or glass bottles can be sealed.
  • the sterilizer (1) consists essentially of a pot-like or trough-like outer element (3) and an inner element (4) that is hat-shaped.
  • the outer element (3) and the inner element (4) together define a sterilization chamber (5) into which the workpiece (2) enters during the sterilization process. is set. Due to an implementation of the sterilization process at ambient pressure, it is possible to form the sterilization chamber (5) open in areas.
  • the inner member (4) and the outer member (3) are formed such that both an inner side and an outer side of the workpiece (2) can be sterilized.
  • the outer element (3) and the inner element (4) are contoured substantially cylindrical wall.
  • the sterilization process is performed by the application of a plasma that has substantially an ambient pressure or a normal pressure.
  • the plasma has a temperature that is not significantly increased compared to an ambient temperature. As a result, a thermal load on the workpiece (2) is avoided.
  • the outer element (3) is provided with an inner space (6) which is bounded by an inner wall (7) and an outer wall (8).
  • the inner wall (7) and the outer wall (8) are each shaped like a trough and are connected to each other by a flange (9), which is of annular design in the illustrated embodiment.
  • coil-like laid wires (10) are arranged, which are connected to a DC voltage or to a high-frequency AC voltage.
  • the voltage amplitudes can range from 100 volts to a few thousand volts.
  • the inner wall (7) is grounded and provided with outflow openings (11).
  • one or more feed openings (12) are arranged for a process gas. After ignition of the plasma in the region of the inner space (6), the plasma exits from the outflow openings (11) and acts on the outer
  • the inner element (4) has a substantially similar construction as the outer element (3). Again, an interior (13) of an inner wall (14) and an outer wall (15) is limited and the inner wall (14) and the outer wall (15) by a flange (16) are interconnected. Outflow openings (17) are here, however, arranged in the region of the outer wall (15) and a coil-like wire (18) for generating the required electric field extends in the region of the interior (13) facing surface of the inner wall (14). A feed opening (19) for the optional supply of a process gas is in turn arranged in the region of the flange (16).
  • the flanges (9, 16) are expediently formed from an electrically insulating material.
  • the wires (10, 18) are preferably made of a highly electrically conductive material, for example copper.
  • FIG. 2 shows a sterilizing device (20) in which a plurality of sterilizers (1) are arranged on rotating transport wheels (21, 22).
  • the outer elements (3) are in this case along a circumference of the transport wheel (21) and the inner elements (4) along a circumference of the transport wheel (22) positioned.
  • a distance of the transport wheels (21, 22) relative to each other and a distance between the outer elements (3) and the inner elements (4) along the respective circumference of the transport wheels (21, 22) are chosen such that in a sterilization positioning the workpiece (2) is acted upon by the sterilization medium for a sufficiently long time.
  • a rotation of the transport wheels (21, 22) can take place continuously or clocked.
  • the downtimes of the transport wheels (21, 22) respectively essentially correspond to the sterilization time.
  • the workpieces (2) are fed to the sterilizing device (20) preferably in a transport direction (23) in a row and at a distance relative to one another, which is adapted to the spacings of the outer elements (3) or the inner elements (4).
  • FIG. 3 shows the arrangement of FIG. 2 in a somewhat greater detail.
  • the arrangement of a workpiece (2) in the region of an outer element (3) and an inner element (4) is shown, which are arranged relative to one another in the sterilization position.
  • Fig. 4 shows another construction of a sterilizer (20).
  • the use of outer elements (3) and inner elements (4) is dispensed with and the workpieces (2) to be sterilized are merely guided past a sterilizing nozzle (24).
  • the transport of the workpieces (2) can in turn be continuous or clocked.
  • two sterilizing nozzles (24) arranged on opposite sides of the workpiece (2) can be used.
  • the sterilizing nozzles in rows next to each other. From the sterilizing nozzle (24) exits a plasma flow (25), which contains ionized gases to carry out the sterilization process.
  • the sterilizing nozzle (24) can be designed, for example, as a plasma jet.
  • FIG. 5 shows another possible embodiment for constructing a sterilizer (20).
  • a plurality of outer elements (3) and inner elements (4) are in this case arranged on support plates (26, 27). At least one of the support plates (26, 27) is arranged positionable substantially perpendicular to the other support plate (26, 27).
  • Fig. 6 illustrates preferred distance specifications in the arrangement of a workpiece (2) in a from the outer element (3) and the inner element (4) limited sterilization chamber (5).
  • An inner distance (28) between the workpiece (2) and the inner element (4) is in the range of 1 to 10 mm.
  • an outer distance (29) between the workpiece (2) and the outer member (3) is in the range of 1 to 10 mm.
  • a base distance (30) between a base of the outer member (3) and a base of the workpiece (2) is also 1 to 10 mm.
  • Fig. 7 illustrates for the arrangement shown there an inner distance (31) of a maximum of 30 mm and a base distance (32) in the range of 1 to 10 mm.
  • Fig. 8 shows the generation of a plasma flow (25), in which a process gas (33) is additionally supplied.
  • a process gas for example, H2O2, Ar, He, Ne, Kr, N2, 02, H2, CF4 or SF6 can be used.
  • OH groups, atomic oxygen and atomic fluorine prove to be extremely reactive and microbiocidal. Compared to an ambient air plasma, this sterilization effect can be significantly improved.
  • the ionized process gases emerge from the plasma flow (25) and develop their effect in a surrounding area (34).
  • the plasma generation is carried out using a wire (10) which is arranged on an insulator (35) and generates a discharge region (36) due to a high voltage, in particular when generating a high-frequency alternating current.
  • the method and the device according to the invention it is generally intended to generate the plasma flow (25) by supplying a gas in order to maintain the temperature of the plasma flow (25) in a range of material changes in the region of the workpiece avoids.
  • a gas in addition to the special process gases listed above, basically any gas is suitable for this, for example also ambient air,
  • the electrodes (15, 3, 14, 8) can also be connected to a high-frequency alternating voltage with a suitable voltage level.
  • Fig. 9 illustrates the formation of an inner member (4) provided with a supply of process gas (33).
  • FIG. 10 illustrates the arrangement of a coil-like arrangement of wires (18) on the inner wall (14) to generate the field required to ignite the plasma upon a corresponding high frequency current application.
  • 11 shows an enlarged representation of the detail (11) in FIG. 9.
  • a plasma flow (25) emerging from the outflow opening (17) can be seen.
  • the plasma flow (25) is expelled from the outflow opening (17).
  • this material is conductive.
  • sintered metal particles can be used.
  • FIG. 12 shows a further illustration of an outer element (3).
  • a plurality of plasma flows (25) emerging from the outflow openings (11) can be seen.
  • Fig. 13 shows an embodiment in which the wires (10) via a resistor (37) to a high-frequency generator (38) are connected.
  • the resistor (37) makes the plasma high-impedance and thereby leads to a stabilization of the plasma burning at atmospheric pressure.
  • Fig. 14 shows the generation of the plasma using an RF generator (39).
  • the RF generator (39) provides a frequency of the electrical excitation current in the range of 100 kHz to 300 MHz.
  • the metallically formed inner wall (7) and the outer wall (8) act as electrodes, so that a use of wires (10) is not required. This design is applicable to all shown in the figures representations of plasma apparatus, for which according to the embodiments shown in the figures, one of the respective electrodes of electrode wires is formed.
  • FIG. 15 shows a further variant in which the RF generator (39) is connected to the outer element (3) via a matching network (40). This results in an adaptation of the RF discharge to the RF generator (39).
  • FIG. 16 shows an embodiment of the sterilizer (1) in which a dielectric (41) is arranged in the region of a surface of the outer wall (8) facing the inner space (6).
  • the high voltage used to generate the plasma is between the inner wall (7) and the outer wall (8), which each form the electrodes.
  • the height of the high voltage is chosen such that just one discharge is ignited.
  • the dielectric (41) hinders a direct discharge, so that the discharge is formed on the basis of the characteristic of the displacement currents of the dielectric (41).
  • FIG. 17 shows a further embodiment for generating a plasma flow (25).
  • an inner electrode (42) is surrounded by an insulator (43) and arranged within an outflow channel (44).
  • the discharge is generated between the inner electrode (42) and an outer electrode (45).
  • the sterilizing properties can also be improved in this embodiment.
  • Fig. 18 shows an arrangement of several plasma generators according to Fig. 17 in the region of a curved surface (46). By arranging a plurality of outflow channels (44), a plurality of plasma flows (45) are generated.
  • a hydrogen peroxide evaporator (47) is coupled to a plasma generator (49) via a mixer (48).
  • a process gas supply (50) is additionally connected to the mixing device (48).
  • a typical process gas flow is in the range of 500 to 10,000 sccm (standard cubic centimeter).
  • a typical hydrogen peroxide gas flow is in the range of 0.5 to 100 sccm.
  • Fig. 20 shows a detailed construction of the evaporator (47).
  • liquid hydrogen peroxide is supplied at a concentration of 5 to 60%.
  • a supply (53) of hydrogen peroxide collects in an interior space (52), wherein a respective filling level is optionally detected via a filling level device (54) and controlled on the basis of the corresponding measured value.
  • Via a heater (55) is supplied so much heating energy that the supply (53) assumes a temperature in the range of 100 to 160 ° C. This produces gaseous hydrogen peroxide, which exits the outlet (56) and can either be fed directly to the plasma generator (49) or to the mixing device (48).
  • Fig. 21 shows a modification of the evaporator (47).
  • a control element (58) which is designed, for example, as a valve or as a metering pump, the liquid hydrogen peroxide is fed to the evaporator (47).
  • the evaporator (47) has helical passages (59).
  • a gaseous hydrogen peroxide exits an outlet (56) of the evaporator (47) via a control element (60) which is designed, for example, as a valve or as a mass flow regulator.
  • the mass flow is in the range of 0.5 to 100 sccm.
  • the hydrogen peroxide is heated to a temperature of 100 0 C to 160 ° C.
  • the supply of process gas (33) can be used to specify the temperature of the plasma flow (25).
  • a larger feed flow of process gas (33) leads to a lower plasma flow temperature (25).
  • results in a flow of process gas (33) of 1000 sccm, a temperature of the plasma flow (25) of 160 0 C and at a feed flow of 3500 sccm of process gas (33) has a temperature of 40 ° C the plasma flow (25) ,
  • the decomposition of the hydrogen peroxide takes place on the one hand by the ionized gases of the plasma and by the electrons present in the plasma itself, but also by the given temperature conditions and by the UV radiation generated by the plasma.
  • decomposing the hydrogen peroxide arise OH groups and atomic oxygen. These radicals increase the temperature of the plasma and thus gain increased efficacy.
  • the radicals because of their chemical character, tend to combine with other molecules, in particular the molecular chains of the shells of microorganisms, thereby damaging the structure of the microorganisms.
  • the decomposition products of the hydrogen peroxide emerge from the actual plasma flame and extend the sterilization effective area in each resultant spatial direction by about 10 mm. This allows the geometry of the piasm Ma articulate be simplified because the distance to the workpiece (2) can be increased.

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  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Abstract

L'invention concerne un procédé et un dispositif de stérilisation et/ou de désinfection de pièces en matière plastique. La stérilisation et/ou la désinfection sont obtenues à l'aide d'un plasma. Le plasma est produit dans un gaz qui présente au moins approximativement une pression égale à celle de l'environnement.
EP09776848A 2008-07-21 2009-06-26 Procédé et dispositif de stérilisation et/ou de désinfection Withdrawn EP2307061A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008034111A DE102008034111A1 (de) 2008-07-21 2008-07-21 Verfahren und Vorrichtung zum Sterilisieren und/oder Entkeimen
PCT/EP2009/004625 WO2010009795A1 (fr) 2008-07-21 2009-06-26 Procédé et dispositif de stérilisation et/ou de désinfection

Publications (1)

Publication Number Publication Date
EP2307061A1 true EP2307061A1 (fr) 2011-04-13

Family

ID=41102119

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09776848A Withdrawn EP2307061A1 (fr) 2008-07-21 2009-06-26 Procédé et dispositif de stérilisation et/ou de désinfection

Country Status (3)

Country Link
EP (1) EP2307061A1 (fr)
DE (1) DE102008034111A1 (fr)
WO (1) WO2010009795A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011056260A1 (de) * 2011-12-12 2013-06-13 Krones Ag Behältnissterilisation mit UV-Strahlung
DE102012106532A1 (de) * 2012-07-19 2014-01-23 Krones Ag Vorrichtung und Verfahren zur Behandlung von Verschlüssen für Behälter
DE102013203648A1 (de) 2013-03-04 2014-09-04 INP Greifswald Leibniz-Institut für Plasmaforschung und Technologie e. V. Verfahren und vorrichtung zur plasmabehandlung von hohlkörpern

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
RU2067003C1 (ru) * 1995-12-15 1996-09-27 Общество с ограниченной ответственностью Научно-производственная фирма "Плайн" Способ обработки поверхностей тел и устройство для его осуществления
AU2648297A (en) * 1996-05-22 1997-12-09 Tetra Laval Holdings & Finance Sa Method and apparatus for treating inside surfaces of containers
DE19719911A1 (de) * 1997-05-13 1998-11-19 Max Kettner Gmbh & Co Kg I K Vorrichtung zur Behandlung von Getränkebehältern
JP4841236B2 (ja) * 2005-11-30 2011-12-21 三洋電機株式会社 殺菌方法および殺菌装置
JP2007268252A (ja) * 2006-03-07 2007-10-18 Univ Of Ryukyus 滅菌装置及びそれを用いた滅菌方法

Non-Patent Citations (1)

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Title
See references of WO2010009795A1 *

Also Published As

Publication number Publication date
WO2010009795A1 (fr) 2010-01-28
DE102008034111A1 (de) 2010-01-28

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