EP2576857A1 - Device for plasma treatment of workpieces - Google Patents

Device for plasma treatment of workpieces

Info

Publication number
EP2576857A1
EP2576857A1 EP11754610.1A EP11754610A EP2576857A1 EP 2576857 A1 EP2576857 A1 EP 2576857A1 EP 11754610 A EP11754610 A EP 11754610A EP 2576857 A1 EP2576857 A1 EP 2576857A1
Authority
EP
European Patent Office
Prior art keywords
plasma
chamber
process gas
channel
station
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Withdrawn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
EP11754610.1A
Other languages
German (de)
French (fr)
Inventor
Sönke SIEBELS
Hartwig Müller
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 Corpoplast 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 Corpoplast GmbH filed Critical KHS Corpoplast GmbH
Publication of EP2576857A1 publication Critical patent/EP2576857A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D23/00—Details of bottles or jars not otherwise provided for
    • B65D23/02—Linings or internal coatings
    • 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
    • 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
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
    • C23C16/45561—Gas plumbing upstream of the reaction chamber
    • 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
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
    • C23C16/511—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using microwave discharges
    • 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
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/54—Apparatus specially adapted for continuous coating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32431—Constructional details of the reactor
    • H01J37/3244—Gas supply means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32431—Constructional details of the reactor
    • H01J37/32733—Means for moving the material to be treated
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32431—Constructional details of the reactor
    • H01J37/32798—Further details of plasma apparatus not provided for in groups H01J37/3244 - H01J37/32788; special provisions for cleaning or maintenance of the apparatus
    • H01J37/32807—Construction (includes replacing parts of the apparatus)
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32431—Constructional details of the reactor
    • H01J37/32798—Further details of plasma apparatus not provided for in groups H01J37/3244 - H01J37/32788; special provisions for cleaning or maintenance of the apparatus
    • H01J37/32899—Multiple chambers, e.g. cluster tools
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
    • H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
    • H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
    • H01L21/68764—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a movable susceptor, stage or support, others than those only rotating on their own vertical axis, e.g. susceptors on a rotating caroussel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
    • H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
    • H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
    • H01L21/68771—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by supporting more than one semiconductor substrate

Definitions

  • the invention relates to a device for the plasma treatment of workpieces, which has at least one evacuatable plasma chamber for receiving the workpieces and in which the plasma chamber is arranged in the region of a treatment station and in which the plasma chamber is delimited by a chamber bottom, a chamber cover and a lateral chamber wall is and in which the plasma chamber with a device for the controllable supply and / or discharge of process gases.
  • Such methods and devices are used, for example, to provide plastics with surface coatings; in particular, such devices are already known for coating inner or outer surfaces of containers which are used for packaging liquid foods. are provided. In addition, facilities for plasma sterilization are known.
  • PCT WO 95/22413 describes a plasma chamber for interior coating of PET bottles.
  • the bottles to be coated are raised by a movable floor in a plasma chamber and brought in the area of a bottle mouth with an adapter in combination. Through the adapter, an evacuation of the bottle interior can take place.
  • a hollow gas lance is inserted through the adapter into the interior of the bottles to supply process gas. Ignition of the plasma occurs using a microwave.
  • EP-OS 10 10 773 a feeder is described to evacuate a bottle interior and to supply with process gas.
  • PCT-WO 01/31680 a plasma chamber is described in which the bottles are introduced by a movable lid which has been previously connected to a mouth region of the bottles.
  • PCT-WO 00/58631 likewise already shows the arrangement of plasma stations on a rotating wheel and, for such an arrangement, describes a group-wise assignment of vacuum pumps and plasma stations in order to assist a favorable evacuation of the chambers as well as the interior spaces of the bottles.
  • the coating of several containers in a common plasma station or a common cavity is mentioned.
  • Another arrangement for carrying out an inner coating of bottles is described in PCT-WO 99/17334.
  • an arrangement of a microwave generator above the plasma chamber as well as a vacuum and resource supply line through a bottom of the plasma chamber will be described.
  • a gas lance is described, which is retractable into the interior of a preform to be coated and serves for the supply of process gases.
  • the gas lance is positionable in the longitudinal direction of the container.
  • thermoplastic plastic material In the vast number of known devices for improvement of barrier properties of the thermoplastic plastic material through the plasma generated container layers of silicon oxides having the general chemical formula SiO x used. Such barrier layers prevent the penetration of oxygen into the packaged liquids and escape of carbon dioxide in C0 2 -containing liquids.
  • the plasma stations are typically to be connected to vacuum sources with different levels of negative pressures, moreover, it is necessary to supply different process gases for carrying out the plasma treatment.
  • the control of this supply and discharge of process gases is typically carried out using control valves, the output side of which are connected to the plasma chamber and the input side via connecting lines with the associated process gas sources.
  • the corresponding connection with the process gas sources is relatively complicated if the plasma chambers together with the valves are arranged on a rotatable plasma wheel.
  • the valves are first connected via lines with a rotary distributor, which in turn is then connected via further connecting lines with the stationarily arranged process gas sources.
  • connection technique described above leads to a variety of couplings and connecting elements that can be leaking at longer operating times.
  • connection of the plasma chambers with the vacuum sources moreover, relatively large conduit cross sections are required in order to avoid flow losses.
  • the object of the present invention is to construct a device of the aforementioned type such that an effective process gas supply of the plasma chambers is supported.
  • the plasma chamber is disposed on a rotatable plasma wheel, which is supported by a stationary base and that at least one process gas channel is arranged in the region of the base, which is limited at least partially by a cover which is part of the Plasmarades is formed, and in that the cover has at least one connection opening to the process gas channel, which is coupled via a connecting channel and at least one control valve with an interior of the plasma chamber.
  • the arrangement of the process gas duct stationary in the region of the base and the arrangement of the control valve in the region of the rotating with the plasma wheel cover allows an extremely compact design.
  • the process gas channel can become in the immediate vicinity of the plasma chamber and provided with a large cross-section.
  • the supply of the plasma chamber is done with a low flow resistance.
  • the number of components to be interconnected is significantly reduced over the prior art and thereby reduces the risk of leakage.
  • necessary service and maintenance work is minimized.
  • the device according to the invention is particularly suitable for assisting the flow of a coating procedure for plastic bottles.
  • an inner coating of these bottles with a layer of SiOx takes place, it being possible to improve the adhesion of the layer of SiOx on the plastic by means of an intermediate layer, which is formed as an adhesion promoter.
  • the coating process is preferably carried out as a PICVD plasma process (plasma impulse induced chemical vapor deposition).
  • the plasma is ignited using pulses from a microwave.
  • the pulses can be controlled with regard to their pulse width, the pulse spacing and the pulse height.
  • a seal between the cover and the walls of the process gas passage is facilitated by the fact that the process gas channel extends substantially concentric with an axis of rotation of the plasma wheel.
  • a compact construction is supported by the fact that the control valve is arranged in the region of a valve block. Also, the compactness of the arrangement is supported by extending within the valve block at least one channel connecting the control valve to the plasma station.
  • a simultaneous supply of a plurality of cavities is supported by the fact that the channel has at least one channel branch for connection of the control valve with at least two cavities.
  • the supply and discharge of workpieces to be treated is facilitated by the fact that the cavities are arranged in rows along a circumference of the plasma wheel.
  • a chamber wall of the plasma station is arranged positionable in a vertical direction.
  • a long operability of the microwave generators is assisted by the fact that a microwave generator is immovably deten relative to a station frame of the plasma station.
  • a compact design of the plasma bath as well as good accessibility is supported by the fact that the plasma channel is arranged on the plasma wheel inside relative to the plasma station.
  • FIG. 1 A schematic diagram of a plurality of plasma chambers, which are arranged on a rotating plasma wheel and in which the plasma wheel is coupled to input and output wheels, an arrangement similar to FIG. 1, in which the plasma stations are each equipped with two plasma chambers, a perspective view Representation of a plasma bath with a plurality of plasma chambers, a perspective view of a plasma station with a cavity, a front view of the device of FIG. 4 with closed plasma chamber, a cross section along section line VI-VI in Fig. 5, a partial representation of a vertical section through the stationary Base and the processing station to illustrate the assignment of the process gas channels and the control valves,
  • Fig. 8 is a perspective view of a plasma station with four cavities and 9 is a perspective view of a folded up for cleaning purposes plate-like valve holder,
  • FIG. 1 shows a plasma module (1), which is provided with a rotating plasma wheel (2). Along a circumference of the plasma bath (2) a plurality of plasma stations (3) are arranged. The plasma stations (3) are provided with cavities (4) or plasma chambers (17) for receiving workpieces (5) to be treated.
  • the workpieces (5) to be treated become the plasma module
  • the plasma stations (3) are each equipped with two cavities (4) or plasma chambers (17).
  • two workpieces (5) can be treated simultaneously.
  • Fig. 3 shows a perspective view of a plasma module (1) with partially constructed plasma wheel (2).
  • the plasma stations (3) are arranged on a support ring (14), which is formed as part of a rotary joint and mounted in the region of a machine base (15).
  • the plasma stations (3) each have a station frame (16) which holds plasma chambers (17).
  • the plasma chambers (17) have cylindrical chamber walls (18) and microwave generators (19).
  • a rotary distributor (20) is arranged, via which the plasma stations (3) are supplied with resources and energy.
  • ring circuits (21) can be used for distributing the operating medium.
  • the workpieces (5) to be treated are shown below the cylindrical chamber walls (18). Parts of the plasma chambers (17) are not shown for simplicity.
  • Fig. 4 shows a plasma station (3) in a perspective view. It can be seen that the station's frame (16) with guide rods (23) is provided, on which a carriage (24) for holding the cylindrical chamber wall (18) is guided. 4 shows the carriage (24) with chamber wall (18) in a raised state, so that the workpiece (5) is released.
  • the microwave generator (19) is connected via a deflection (25) and an adapter (26) to a coupling channel (27), which opens into the plasma chamber (17).
  • the microwave generator (19) both directly in the region of the Kammerdek- (31) and via a spacer element to the chamber lid (31) coupled with a predetermined distance to the chamber lid (31) and thus in a larger surrounding area of the chamber lid (31) to be ordered.
  • the adapter (26) has the function of a transition element and the coupling channel (27) is formed as a coaxial conductor.
  • a quartz glass window is arranged in the region of an opening of the coupling channel (27) in the chamber lid (31) .
  • the deflection (25) is designed as a waveguide.
  • the workpiece (5) is positioned by a holding element (28), which is arranged in the region of a chamber bottom (29).
  • the chamber bottom (29) is formed as part of a chamber base (30).
  • Another variant is to attach the chamber base (30) directly to the station frame (16). In such an arrangement, it is also possible, for example, to make the guide rods (23) in two parts in the vertical direction.
  • FIG. 5 shows a front view of the plasma station (3) according to FIG. 3 in a closed state of the plasma chamber (17).
  • the carriage (24) with the cylindrical chamber wall (18) is in this case opposite to the positioning in Fig. 4 is lowered, so that the chamber wall (18) against the chamber bottom (29) is driven. In this positioning state, the plasma coating can be performed.
  • the coupling channel (27) opens into a chamber lid (31) having a laterally projecting flange (32).
  • a seal (33) is arranged, which is acted upon by an inner flange (34) of the chamber wall (18), in a lowered state of the chamber wall (18) thereby sealing the chamber wall (18) relative to Chamber lid (31).
  • a further seal (35) is arranged in a lower region of the chamber wall (18), in order to ensure a seal here relative to the chamber bottom (29).
  • the chamber wall (18) surrounds the cavity (4), so that both an interior of the cavity (4) and an interior of the workpiece (5) can be evacuated.
  • a hollow gas lance (36) is arranged in the region of the chamber cup (30) and can be moved into the interior of the workpiece (5).
  • a lance carriage (37) which can be positioned along the guide rods (23).
  • a process gas channel (38) which is coupled in the raised position shown in Fig. 6 with a gas port (39) of the chamber base (30).
  • the workpiece (5) into a plasma chamber (17) immovable relative to the associated support structure. It is also possible, as an alternative to the illustrated coating of the workpieces (5) with their mouths in the vertical direction down to perform a coating of the workpieces with their mouths in the vertical direction upwards. In particular, it is intended to carry out a coating of bottle-shaped workpieces (5).
  • Such bottles are also preferably formed from a thermoplastic material. Preferably, the use of PET or PP is intended. According to a further preferred embodiment, the coated bottles serve to receive drinks.
  • a typical treatment process is explained below using the example of a coating process and carried out such that first the workpiece (5) using the input wheel (11) is transported to the plasma wheel (2) and that in a pushed-up state of the sleeve-like chamber wall (18) the insertion of the workpiece (5) into the plasma station (3).
  • the chamber wall (18) is lowered into its sealed positioning and offset in time follows a displacement of the holding element (28), so that a foreclosure of the interior of the workpiece (5) relative to the interior of the cavity (4).
  • the gas lance (36) is retracted into the interior of the workpiece. It is also possible to move the gas lance (36) into the interior of the workpiece (5) already synchronously with the commencement of the lowering of the cavity (4). It follows a simultaneous or temporary lent evacuated evacuation of the cavity (4) and from the interior of the workpiece (5). After a sufficient evacuation of the interior of the cavity (4), the pressure in the interior of the workpiece (5) is then further lowered. In addition, it is also intended to carry out the positioning movement of the gas lance (36) at least partially already parallel to the positioning of the chamber wall (18).
  • process gas is introduced into the interior of the workpiece (5) and ignited with the aid of the microwave generator (19) the plasma.
  • the plasma is envisaged to deposit both an adhesion promoter on an inner surface of the workpiece (5) and the actual barrier layer of silicon oxides with the aid of the plasma.
  • the plasma chamber (17) and the interior of the workpiece (5) is vented. After reaching the ambient pressure within the cavity (4) and in the interior of the workpiece (5), the chamber wall (18) is raised again and the gas lance (36) again removed from the interior of the workpiece (5). A removal of the coated workpiece (5) and an input of a new workpiece to be coated (5) can now be performed.
  • a positioning of the chamber wall (18), the sealing element (28) and / or the gas lance (36) can be carried out using different drive units.
  • it is intended to support an exact movement ordination with a rotation of the plasma wheel (2) to realize a curve control.
  • the cam control may for example be designed such that along a circumference of the plasma wheel (2) control cams are arranged along which cam rollers are guided. The cam rollers are coupled to the respective components to be positioned.
  • Fig. 7 illustrates the number of a plurality of process gas channels (40) in the region of the machine base (15).
  • the process gas channels (40) each have a bottom (41) and side walls (42) fixedly connected to the machine base (15). Opposite the bottom (41) is a cover (43) arranged as part of the plasma wheel (2). The cover (43) is sealed against the side walls (42) out.
  • connection openings (44) are arranged, which open into the process gas channels (40).
  • the connection openings (44) are each coupled via connection channels (45) with control valves (46).
  • control valves (46) control a connection of the plasma stations (3) with the process gas channels (40) and thus with the associated process gas supplies, in particular, it is intended to arrange the control valves (46) in the region of a valve block (47), in turn with the Chamber socket (30) is connected.
  • channel branches are arranged in the region of the valve block (47) to supply a specific process gas via only one control valve (46) of the plurality to be able to supply to cavities (4) or to realize a connection to a vacuum supply.
  • the process gas channels (40) extend concentrically with a center of the plasma wheel (2).
  • the process gas channels (40) extend concentrically with a center of the plasma wheel (2).
  • Fig. 8 illustrates a plasma station (3) with four cavities (4).
  • the microwave generator (19) typically has a number of microwave modules (48) corresponding to the number of cavities (4). In this way, each of the cavities (4) can be assigned a separate microwave module (48).
  • a positioning of the chamber wall (18) takes place according to a preferred embodiment of the invention mechanically using a cam control.
  • a cam roller (49) connected to the chamber wall (18) is guided in this case.
  • a mechanical cam control is preferably also used.
  • the lance carriage (37) is provided for this purpose with a cam roller (50).
  • Positioning of the gas lances (36), which are not visible in FIG. 8, relative to the lance carriage (37) is preferably carried out using a pneumatic cylinder (51) the combination of the mechanical control and the pneumatic control can decouple the operations of sealing the cavities (4) and the workpieces (5) and the actual retraction of the gas lances (36) into the workpieces (5).
  • FIG. 9 shows a perspective view of the valve block (47). It will be appreciated that a support plate (52) supporting the control valves (46) is pivotally mounted relative to a base member (53). For this purpose, a pivot joint (54) is used.
  • the pivot (54) is preferably disposed on a side of the base member (53) that is inboard in a radial direction of the plasma wheel (2). In the folded-up operating state shown in FIG. 9, undersides of the control valves (56) and valve seats arranged in the region of the base element (53) are easily accessible and can be cleaned.
  • the fixing element (55) may be formed as a screw.
  • An arrangement of the individual process gas channels (40) in a radial direction of the plasma wheel (2) is preferably carried out as a function of the respectively relevant fluidic conductance. This is understood as the quotient of volume flow and pressure. The larger this conductance, the more critical the vacuum technology requirements become. This means that with increasing volume flow or decreasing pressures increased demands are made.
  • the process gas channel (40) is arranged with the relatively highest suppression. Here is the lowest vacuum technical conductance. In the radial direction of the plasma wheel (2) to the outside and thus with smaller distances to the plasma station (3) then follow the process gas supplies with increasing to be considered conductance.

Abstract

The invention relates to a device for plasma treatment of workpieces. The workpiece is placed into a chamber of a processing station that can be at least partially evacuated. The plasma chamber is bounded by a chamber floor, a chamber cover, and a side chamber wall. The plasma chamber is coupled to a device for feeding and/or discharging process gases in a controlled manner. The plasma chamber is further disposed on a rotatable plasma wheel supported on a static base. At least one process gas channel is disposed in the region of the base, bounded at least in regions by a cover. The cover is implemented as part of the plasma wheel and comprises at least one connection opening to the process gas channel. The connection opening can be coupled to an inner chamber by a connecting channel and at least one control valve.

Description

Vorrichtung zur Plasmabehandlung von Werkstücken  Apparatus for the plasma treatment of workpieces
Die Erfindung betrifft eine Vorrichtung zur Plasmabehand- lung von Werkstücken, die mindestens eine evakuierbare Plasmakammer zur Aufnahme der Werkstücke aufweist und bei der die Plasmakammer im Bereich einer BehandlungsStation angeordnet ist, sowie bei der die Plasmakammer von einem Kammerboden, einem Kammerdeckel sowie einer seitlichen Kammerwandung begrenzt ist und bei der die Plasmakammer mit einer Einrichtung zur steuerbaren Zuführung und/oder Ableitung von Prozeßgasen. The invention relates to a device for the plasma treatment of workpieces, which has at least one evacuatable plasma chamber for receiving the workpieces and in which the plasma chamber is arranged in the region of a treatment station and in which the plasma chamber is delimited by a chamber bottom, a chamber cover and a lateral chamber wall is and in which the plasma chamber with a device for the controllable supply and / or discharge of process gases.
Derartige Verfahren und Vorrichtungen werden beispielsweise eingesetzt, um Kunststoffe mit Oberflächenbeschichtungen zu versehen, insbesondere sind auch bereits derartige Vorrichtungen bekannt, um innere oder äußere Oberflächen von Behältern zu beschichten, die zur Verpackung von Flüssigkei- ten vorgesehen sind. Darüber hinaus sind Einrichtungen zur Plasmasterilisation bekannt. Such methods and devices are used, for example, to provide plastics with surface coatings; in particular, such devices are already known for coating inner or outer surfaces of containers which are used for packaging liquid foods. are provided. In addition, facilities for plasma sterilization are known.
In der PCT-WO 95/22413 wird eine Plasmakammer zur Innenbe- schichtung von Flasche aus PET beschrieben. Die zu beschichtenden Flaschen werden durch einen beweglichen Boden in eine Plasmakammer hineingehoben und im Bereich einer Flaschenmündung mit einem Adapter in Verbindung gebracht. Durch den Adapter hindurch kann eine Evakuierung des Fla- scheninnenraumes erfolgen. Darüber hinaus wird durch den Adapter hindurch eine hohle Gaslanze in den Innenraum der Flaschen eingeführt, um prozeßgas zuzuführen. Eine Zündung des Plasmas erfolgt unter Verwendung einer Mikrowelle. PCT WO 95/22413 describes a plasma chamber for interior coating of PET bottles. The bottles to be coated are raised by a movable floor in a plasma chamber and brought in the area of a bottle mouth with an adapter in combination. Through the adapter, an evacuation of the bottle interior can take place. In addition, a hollow gas lance is inserted through the adapter into the interior of the bottles to supply process gas. Ignition of the plasma occurs using a microwave.
Aus dieser Veröffentlichung ist es auch bereits bekannt, eine Mehrzahl von Plasmakammern auf einem rotierenden Rad anzuordnen. Hierdurch wird eine hohe Produktionsrate von Flaschen je Zeiteinheit unterstützt. From this publication, it is also already known to arrange a plurality of plasma chambers on a rotating wheel. This supports a high production rate of bottles per unit time.
In der EP-OS 10 10 773 wird eine Zuführeinrichtung erläutert, um einen Flascheninnenraum zu evakuieren und mit Prozeßgas zu versorgen. In der PCT-WO 01/31680 wird eine Plasmakammer beschrieben, in die die Flaschen von einem beweglichen Deckel eingeführt werden, der zuvor mit einem Mündungsbereich der Flaschen verbunden wurde. In EP-OS 10 10 773 a feeder is described to evacuate a bottle interior and to supply with process gas. In PCT-WO 01/31680 a plasma chamber is described in which the bottles are introduced by a movable lid which has been previously connected to a mouth region of the bottles.
Die PCT-WO 00/58631 zeigt ebenfalls bereits die Anordnung von Plasmastationen auf einem rotierenden Rad und beschreibt für eine derartige Anordnung eine gruppenweise Zuordnung von Unterdruckpumpen und Plasmastationen, um eine günstige Evakuierung der Kammern sowie der Innenräume der Flaschen zu unterstützen. Darüber hinaus wird die Beschich- tung von mehreren Behältern in einer gemeinsamen Plasmastation bzw. einer gemeinsamen Kavität erwähnt. Eine weitere Anordnung zur Durchführung einer Innenbe- schichtung von Flaschen wird in der PCT-WO 99/17334 beschrieben. Es wird hier insbesondere eine Anordnung eines Mikrowellengenerators oberhalb der Plasmakammer sowie eine Vakuum- und Betriebsmittelzuleitung durch einen Boden der Plasmakammer hindurch beschrieben. PCT-WO 00/58631 likewise already shows the arrangement of plasma stations on a rotating wheel and, for such an arrangement, describes a group-wise assignment of vacuum pumps and plasma stations in order to assist a favorable evacuation of the chambers as well as the interior spaces of the bottles. In addition, the coating of several containers in a common plasma station or a common cavity is mentioned. Another arrangement for carrying out an inner coating of bottles is described in PCT-WO 99/17334. In particular, an arrangement of a microwave generator above the plasma chamber as well as a vacuum and resource supply line through a bottom of the plasma chamber will be described.
In der DE 10 2004 020 185 AI wird bereits eine Gaslanze beschrieben, die in den Innenraum eines zu beschichtenden Vorformlings einfahrbar ist und zur Zuleitung von Prozeßgasen dient. Die Gaslanze ist in der Längsrichtung des Behälters positionierbar. In DE 10 2004 020 185 Al, a gas lance is described, which is retractable into the interior of a preform to be coated and serves for the supply of process gases. The gas lance is positionable in the longitudinal direction of the container.
Bei der überwiegenden Anzahl der bekannten Vorrichtungen werden zur Verbesserung von Barriereeigenschaften des thermoplastischen Kunststoffmaterials durch das Plasma erzeugte Behälterschichten aus Siliziumoxiden mit der allgemeinen chemischen Formel SiOx verwendet. Derartige Barriereschichten verhindern ein Eindringen von Sauerstoff in die verpackten Flüssigkeiten sowie ein Austreten von Kohlendioxid bei C02-haltigen Flüssigkeiten. In the vast number of known devices for improvement of barrier properties of the thermoplastic plastic material through the plasma generated container layers of silicon oxides having the general chemical formula SiO x used. Such barrier layers prevent the penetration of oxygen into the packaged liquids and escape of carbon dioxide in C0 2 -containing liquids.
Die Plasmastationen sind typischerweise an Unterdruckquellen mit unterschiedlich hohen Unterdrücken anzuschließen, darüber hinaus ist es erforderlich, zur Durchführung der Plasmabehandlung unterschiedliche Prozeßgase zuzuführen. Die Steuerung dieser Zuführung und Ableitung von Prozeßgasen erfolgt typischerweise unter Verwendung von Steuerventilen, die ausgangsseitig mit der Plasmakammer und ein- gangsseitig über Verbindungsleitungen mit den zugeordneten Prozeßgasquellen verbunden sind. Die entsprechende Verbindung mit den Prozeßgasquellen gestaltet sich relativ aufwendig, wenn die Plasmakammern gemeinsam mit den Ventilen auf einem rotationsfähigen Plasmarad angeordnet sind. In diesem Fall werden die Ventile zunächst über Leitungen mit einem Drehverteiler verbunden, der dann seinerseits über weitere Verbindungsleitungen mit den stationär angeordneten Prozeßgasquellen verbunden wird. The plasma stations are typically to be connected to vacuum sources with different levels of negative pressures, moreover, it is necessary to supply different process gases for carrying out the plasma treatment. The control of this supply and discharge of process gases is typically carried out using control valves, the output side of which are connected to the plasma chamber and the input side via connecting lines with the associated process gas sources. The corresponding connection with the process gas sources is relatively complicated if the plasma chambers together with the valves are arranged on a rotatable plasma wheel. In this case, the valves are first connected via lines with a rotary distributor, which in turn is then connected via further connecting lines with the stationarily arranged process gas sources.
Die vorstehend beschriebene Verbindungstechnik führt zu einer Vielzahl von Kupplungen und Verbindungselementen, die bei längeren Betriebszeiten undicht werden können. Hinsichtlich der Verbindung der Plasmakammern mit den Unterdruckquellen werden darüber hinaus relativ große Leitungs- querschnitte erforderlich, um Strömungsverluste zu vermeiden. The connection technique described above leads to a variety of couplings and connecting elements that can be leaking at longer operating times. With regard to the connection of the plasma chambers with the vacuum sources, moreover, relatively large conduit cross sections are required in order to avoid flow losses.
Aufgabe der vorliegenden Erfindung ist es, eine Vorrichtung der einleitend genannten Art derart zu konstruieren, daß eine effektive Prozeßgasversorgung der Plasmakammern unterstützt wird. The object of the present invention is to construct a device of the aforementioned type such that an effective process gas supply of the plasma chambers is supported.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Plasmakammer auf einem rotationsfähigen Plasmarad angeordnet ist, das von einem stationären Sockel gelagert und daß im Bereich des Sockels mindestens ein Prozeßgaskanal angeordnet ist, der mindestens bereichsweise von einer Abdek- kung begrenzt ist, die als Teil des Plasmarades ausgebildet ist, sowie daß die Abdeckung mindestens eine Verbindungsöffnung zum Prozeßgaskanal aufweist, die über einen Verbindungskanal und mindestens ein Steuerventil mit einem Innenraum der Plasmakammer koppelbar ist. This object is achieved in that the plasma chamber is disposed on a rotatable plasma wheel, which is supported by a stationary base and that at least one process gas channel is arranged in the region of the base, which is limited at least partially by a cover which is part of the Plasmarades is formed, and in that the cover has at least one connection opening to the process gas channel, which is coupled via a connecting channel and at least one control valve with an interior of the plasma chamber.
Die Anordnung des Prozeßgaskanals stationär im Bereich des Sockels sowie die Anordnung des Steuerventils im Bereich der mit dem Plasmarad rotierenden Abdeckung ermöglicht eine äußerst kompakte Konstruktion. Der Prozeßgaskanal kann sich in unmittelbarer räumlicher Nähe der Plasmakammer erstrek- ken und mit einem großen Querschnitt versehen werden. Die Versorgung der Plasmakammer erfolgt hierdurch mit einem geringen Strömungswiderstand. Darüber hinaus wird die Anzahl der miteinander zu verbindenden Bauelemente gegenüber dem Stand der Technik erheblich vermindert und hierdurch die Gefahr von Leckagen reduziert. Hinsichtlich des laufenden Betriebes werden darüber hinaus erforderliche Service- und Wartungsarbeiten minimiert . The arrangement of the process gas duct stationary in the region of the base and the arrangement of the control valve in the region of the rotating with the plasma wheel cover allows an extremely compact design. The process gas channel can become in the immediate vicinity of the plasma chamber and provided with a large cross-section. The supply of the plasma chamber is done with a low flow resistance. In addition, the number of components to be interconnected is significantly reduced over the prior art and thereby reduces the risk of leakage. In addition, with regard to the ongoing operation, necessary service and maintenance work is minimized.
Die erfindungsgemäße Vorrichtung ist insbesondere dafür geeignet, den Ablauf eines Beschichtungsverf hrens für Flaschen aus Kunststoff zu unterstützen. Es erfolgt hierbei insbesondere eine InnenbeSchichtung dieser Flaschen mit einer Schicht aus SiOx, wobei die Haftung der Schicht aus Si- Ox auf dem Kunststoff durch eine Zwischenschicht verbessert werden kann, die als ein Haftvermittler ausgebildet ist. Das Beschichtungsverfahren wird vorzugsweise als ein PICVD- Plasmaprozess durchgeführt (Plasma impuls induced Chemical vapour deposition) . Bei einem derartigen Verfahren wird das Plasma unter Verwendung von Pulsen einer Mikrowelle gezündet. Die Pulse können hinsichtlich ihrer Pulsbreite, des Pulsabstandes sowie der Pulshöhe gesteuert werden. The device according to the invention is particularly suitable for assisting the flow of a coating procedure for plastic bottles. In this case, in particular, an inner coating of these bottles with a layer of SiOx takes place, it being possible to improve the adhesion of the layer of SiOx on the plastic by means of an intermediate layer, which is formed as an adhesion promoter. The coating process is preferably carried out as a PICVD plasma process (plasma impulse induced chemical vapor deposition). In such a method, the plasma is ignited using pulses from a microwave. The pulses can be controlled with regard to their pulse width, the pulse spacing and the pulse height.
Eine Abdichtung zwischen der Abdeckung und den Wandungen des Prozeßgaskanals wird dadurch vereinfacht, daß sich der Prozeßgaskanal im Wesentlichen konzentrisch zu einer Rotationsachse des Plasmarades erstreckt. A seal between the cover and the walls of the process gas passage is facilitated by the fact that the process gas channel extends substantially concentric with an axis of rotation of the plasma wheel.
Eine kompakte Konstruktion wird dadurch unterstützt, daß das Steuerventil im Bereich eines Ventilblockes angeordnet ist. Ebenfalls wird die Kompaktheit der Anordnung dadurch unterstützt, daß sich innerhalb des Ventilblockes mindestens ein das Steuerventil mit der Plasmastation verbindender Kanal erstreckt . A compact construction is supported by the fact that the control valve is arranged in the region of a valve block. Also, the compactness of the arrangement is supported by extending within the valve block at least one channel connecting the control valve to the plasma station.
Eine gleichzeitige Versorgung einer Mehrzahl von Kavitäten wird dadurch unterstützt, daß der Kanal mindestens eine Kanalverzweigung zur Verbindung des Steuerventils mit mindestens zwei Kavitäten aufweist. A simultaneous supply of a plurality of cavities is supported by the fact that the channel has at least one channel branch for connection of the control valve with at least two cavities.
Die Zuführung und Ableitung zu behandelnder Werkstücke wird dadurch erleichtert, daß die Kavitäten reihenartig entlang eines Umfanges des Plasmarades angeordnet sind. The supply and discharge of workpieces to be treated is facilitated by the fact that the cavities are arranged in rows along a circumference of the plasma wheel.
Im wesentlichen ausschließlich horizontal verlaufende Tränsportwege der Werkstücke können dadurch erreicht werden, daß eine Kammerwandung der Plasmastation in einer vertikalen Richtung positionierbar angeordnet ist. Essentially only horizontally extending Tränsportwege the workpieces can be achieved in that a chamber wall of the plasma station is arranged positionable in a vertical direction.
Eine lange Betriebsfähigkeit der Mikrowellengeneratoren wird dadurch unterstützt, daß ein Mikrowellengenerator relativ zu einem Stationsrahmen der Plasmastation unbeweglich angeo dnet ist . A long operability of the microwave generators is assisted by the fact that a microwave generator is immovably deten relative to a station frame of the plasma station.
Eine kompakte Konstruktion des Plasmarades sowie eine gute Zugänglichkeit wird dadurch unterstützt, daß der Plasmakanal relativ zur Plasmastation innenliegend auf dem Plasmarad angeordnet ist. A compact design of the plasma bath as well as good accessibility is supported by the fact that the plasma channel is arranged on the plasma wheel inside relative to the plasma station.
Ebenfalls trägt es zu einer kompakten Konstruktion sowie zu einer guten Zugänglichkeit bei, daß der Prozeßgaskanal eine im Wesentlichen rechteckförmige Querschnittfläche aufweist und in lotrechter Richtung nach oben von der Abdeckung begrenzt ist. In den Zeichnungen sind Ausführungsbeispiele der Erfindung schematisch dargestellt. Es zeigen: It also contributes to a compact construction as well as good accessibility in that the process gas channel has a substantially rectangular cross-sectional area and is bounded vertically upwards by the cover. In the drawings, embodiments of the invention are shown schematically. Show it:
Eine Prinzipskizze einer Mehrzahl von Plasmakam- mern, die auf einem rotierenden Plasmarad angeordnet sind und bei der das Plasmarad mit Eingabe- und Ausgaberädern gekoppelt ist, eine Anordnung ähnlich zu Fig. 1, bei der die Plasmastationen jeweils mit zwei Plasmakammern ausgestattet sind, eine perspektivische Darstellung eines Plasmarades mit einer Vielzahl von Plasmakammern, eine perspektivische Darstellung einer Plasmastation mit einer Kavität, eine Vorderansicht der Vorrichtung gemäß Fig. 4 mit geschlossener Plasmakammer, einen Querschnitt gemäß Schnittlinie VI-VI in Fig. 5, eine teilweise Darstellung eines Vertikalschnittes durch den stationären Sockel und die Bearbeitungs- station zur Veranschaulichung der Zuordnung der Prozeßgaskanäle und der Steuerventile, A schematic diagram of a plurality of plasma chambers, which are arranged on a rotating plasma wheel and in which the plasma wheel is coupled to input and output wheels, an arrangement similar to FIG. 1, in which the plasma stations are each equipped with two plasma chambers, a perspective view Representation of a plasma bath with a plurality of plasma chambers, a perspective view of a plasma station with a cavity, a front view of the device of FIG. 4 with closed plasma chamber, a cross section along section line VI-VI in Fig. 5, a partial representation of a vertical section through the stationary Base and the processing station to illustrate the assignment of the process gas channels and the control valves,
Fig. 8 eine perspektivische Darstellung einer Plasmastation mit vier Kavitäten und Fig. 9 eine perspektivische Darstellung einer zu Reinigungszwecken hochgeklappten plattenartigen Ventil- halterung , Fig. 8 is a perspective view of a plasma station with four cavities and 9 is a perspective view of a folded up for cleaning purposes plate-like valve holder,
Aus der Darstellung in Fig. 1 ist ein Plasmamodul (1) zu erkennen, das mit einem rotierenden Plasmarad (2) versehen ist. Entlang eines ümfanges des Plasmarades (2) sind eine Mehrzahl von Plasmastationen (3) angeordnet. Die Plasmastationen (3) sind mit Kavitäten (4) bzw. Plasmakammern (17) zur Aufnahme von zu behandelnden Werkstücken (5) versehen. 1 shows a plasma module (1), which is provided with a rotating plasma wheel (2). Along a circumference of the plasma bath (2) a plurality of plasma stations (3) are arranged. The plasma stations (3) are provided with cavities (4) or plasma chambers (17) for receiving workpieces (5) to be treated.
Die zu behandelnden Werkstücke (5) werden dem PlasmamodulThe workpieces (5) to be treated become the plasma module
(I) im Bereich einer Eingabe (6) zugeführt und über ein Vereinzelungsrad (7) an ein Übergaberad (8) weitergeleitet, das mit positionierbaren Tragarmen (9) ausgestattet ist. Die Tragarme (9) sind relativ zu einem Sockel (10) des Übergaberades (8) verschwenkbar angeordnet, so daß eine Abstandsveränderung der Werkstücke (5) relativ zueinander durchgeführt werden kann. Hierdurch erfolgt eine Übergabe der Werkstücke (5) vom Übergaberad (8) an ein Eingaberad(I) in the region of an input (6) and fed via a separating wheel (7) to a transfer wheel (8), which is equipped with positionable support arms (9). The support arms (9) are arranged pivotable relative to a base (10) of the transfer wheel (8), so that a change in the distance of the workpieces (5) relative to each other can be performed. This results in a transfer of the workpieces (5) from the transfer wheel (8) to an input wheel
(II) mit einem relativ zum Vereinzelungsrad (7) vergrößerten Abstand der Werkstücke (5) relativ zueinander. Das Eingaberad (11) übergibt die zu behandelnden Werkstücke (5) an das Plasmarad (2) . Nach einer Durchführung der Behandlung werden die behandelten Werkstücke (5) von einem Ausgaberad(II) with a relative to the separating wheel (7) increased distance of the workpieces (5) relative to each other. The input wheel (11) transfers the workpieces (5) to be treated to the plasma wheel (2). After performing the treatment, the treated workpieces (5) from a dispensing wheel
(12) aus dem Bereich des Plasmarades (2) entfernt und in den Bereich einer Ausgabestrecke (13) überführt. (12) removed from the area of the plasma wheel (2) and transferred to the area of a discharge line (13).
Bei der Ausführungsform gemäß Fig. 2 sind die Plasmastationen (3) jeweils mit zwei Kavitäten (4) bzw. Plasmakammern (17) ausgestattet. Hierdurch können jeweils zwei Werkstücke (5) gleichzeitig behandelt werden. Grundsätzlich ist es hierbei möglich, die Kavitäten (4) vollständig voneinander getrennt auszubilden, grundsätzlich ist es aber auch mög- lieh, in einem gemeinsamen Kavitätenraum lediglich Teilbereiche derart gegeneinander abzugrenzen, daß eine optimale Beschichtung aller Werkstücke (5) gewährleistet ist. Insbesondere ist hierbei daran gedacht, die Teilkavitäten zumindest durch separate Mikrowelleneinkopplungen gegeneinander abzugrenzen. In the embodiment according to FIG. 2, the plasma stations (3) are each equipped with two cavities (4) or plasma chambers (17). As a result, two workpieces (5) can be treated simultaneously. In principle, it is possible here to form the cavities (4) completely separate from each other, but in principle it is also possible. borrowed, in a common cavity space only subdivisions such delimit each other so that an optimal coating of all workpieces (5) is guaranteed. In particular, this is thought to delimit the partial cavities at least by separate Mikrowelleneinkopplungen against each other.
Fig. 3 zeigt eine perspektivische Darstellung eines Plasmamoduls (1) mit teilweise aufgebautem Plasmarad (2) . Die Plasmastationen (3) sind auf einem Tragring (14) angeordnet, der als Teil einer Drehverbindung ausgebildet und im Bereich eines Maschinensockels (15) gelagert ist. Die Plasmastationen (3) weisen jeweils einen Stationsrahmen (16) auf, der Plasmakammern (17) haltert. Die Plasmakammern (17) weisen zylinderförmige Kammerwandungen (18) sowie Mikrowellengeneratoren (19) auf. in einem Zentrum des Plasmarades (2) ist ein Drehverteiler (20) angeordnet, über den die Plasmastationen (3) mit Betriebsmitteln sowie Energie versorgt werden. Zur Betriebs- mittelverteilung können insbesondere Ringleitungen (21) eingesetzt werden. Fig. 3 shows a perspective view of a plasma module (1) with partially constructed plasma wheel (2). The plasma stations (3) are arranged on a support ring (14), which is formed as part of a rotary joint and mounted in the region of a machine base (15). The plasma stations (3) each have a station frame (16) which holds plasma chambers (17). The plasma chambers (17) have cylindrical chamber walls (18) and microwave generators (19). in a center of the plasma wheel (2) a rotary distributor (20) is arranged, via which the plasma stations (3) are supplied with resources and energy. In particular, ring circuits (21) can be used for distributing the operating medium.
Die zu behandelnden Werkstücke (5) sind unterhalb der zylinderförmigen Kammerwandungen (18) dargestellt. Unterteile der Plasmakammern (17) sind zur Vereinfachung jeweils nicht eingezeichnet . The workpieces (5) to be treated are shown below the cylindrical chamber walls (18). Parts of the plasma chambers (17) are not shown for simplicity.
Fig. 4 zeigt eine Plasmastation (3) in perspektivischer Darstellung. Es ist zu erkennen, daß der Stations ahmen (16) mit FührungsStangen (23) versehen ist, auf denen ein Schlitten (24) zur Halterung der zylinderförmigen Kammerwandung (18) geführt ist. Fig. 4 zeigt den Schlitten (24) mit Kammerwandung (18) in einem angehobenen Zustand, so daß das Werkstück (5) freigegeben ist. Fig. 4 shows a plasma station (3) in a perspective view. It can be seen that the station's frame (16) with guide rods (23) is provided, on which a carriage (24) for holding the cylindrical chamber wall (18) is guided. 4 shows the carriage (24) with chamber wall (18) in a raised state, so that the workpiece (5) is released.
Im oberen Bereich der Plasmastation (3) ist der Mikrowellengenerator (19) angeordnet. Der Mikrowellengenerator (19) ist über eine Umlenkung (25) und einen Adapter (26) an einen Kopplungskanal (27) angeschlossen, der in die Plasmakammer (17) einmündet. Grundsätzlich kann der Mikrowellengenerator (19) sowohl unmittelbar im Bereich des Kammerdek- kels (31) als auch über ein Distanzelement an den Kammerdeckel (31) angekoppelt mit einer vorgebbaren Entfernung zum Kammerdeckel (31) und somit in einem größeren Umgebungsbereich des Kammerdeckels (31) angeordnet werden. Der Adapter (26) hat die Funktion eines Übergangselementes und der Kopplungskanal (27) ist als ein Koaxialleiter ausgebildet. Im Bereich einer Einmündung des Kopplungskanals (27) in den Kammerdeckel (31) ist ein Quarzglasfenster angeordnet. Die Umlenkung (25) ist als ein Hohlleiter ausgebildet. In the upper region of the plasma station (3) of the microwave generator (19) is arranged. The microwave generator (19) is connected via a deflection (25) and an adapter (26) to a coupling channel (27), which opens into the plasma chamber (17). Basically, the microwave generator (19) both directly in the region of the Kammerdek- (31) and via a spacer element to the chamber lid (31) coupled with a predetermined distance to the chamber lid (31) and thus in a larger surrounding area of the chamber lid (31) to be ordered. The adapter (26) has the function of a transition element and the coupling channel (27) is formed as a coaxial conductor. In the region of an opening of the coupling channel (27) in the chamber lid (31) a quartz glass window is arranged. The deflection (25) is designed as a waveguide.
Das Werkstück (5) wird von einem Halteelement (28) positioniert, das im Bereich eines Kammerbodens (29) angeordnet ist. Der Kammerboden (29) ist als Teil eines Kammersockels (30) ausgebildet. Zur Erleichterung einer Justage ist es möglich, den Kammersockel (30) im Bereich der Führungsstangen (23) zu fixieren. Eine andere Variante besteht darin, den Kammersockel (30) direkt am Stationsrahmen (16) zu befestigen. Bei einer derartigen Anordnung ist es beispielsweise auch möglich, die Führungsstangen (23) in vertikaler Richtung zweiteilig auszuführen. The workpiece (5) is positioned by a holding element (28), which is arranged in the region of a chamber bottom (29). The chamber bottom (29) is formed as part of a chamber base (30). To facilitate an adjustment, it is possible to fix the chamber base (30) in the region of the guide rods (23). Another variant is to attach the chamber base (30) directly to the station frame (16). In such an arrangement, it is also possible, for example, to make the guide rods (23) in two parts in the vertical direction.
Fig. 5 zeigt eine Vorderansicht der Plasmastation (3) gemäß Fig. 3 in einem geschlossenen Zustand der Plasmakammer (17) . Der Schlitten (24) mit der zylinderförmigen Kammerwandung (18) ist hierbei gegenüber der Positionierung in Fig. 4 abgesenkt, so daß die Kammerwandung (18) gegen den Kammerboden (29) gefahren ist. In diesem Positionierzustand kann die Plasmabeschichtung durchgeführt werden. FIG. 5 shows a front view of the plasma station (3) according to FIG. 3 in a closed state of the plasma chamber (17). The carriage (24) with the cylindrical chamber wall (18) is in this case opposite to the positioning in Fig. 4 is lowered, so that the chamber wall (18) against the chamber bottom (29) is driven. In this positioning state, the plasma coating can be performed.
Fig. 6 zeigt in einer Vertikalschnittdarstellung die Anordnung gemäß Fig. 5. Es ist insbesondere zu erkennen, daß der Kopplungskanal (27) in einen Kammerdeckel (31) einmündet, der einen seitlich überstehenden Flansch (32) aufweist. Im Bereich des Flansches (32) ist eine Dichtung (33) angeordnet, die von einem Innenflansch (34) der Kammerwandung (18) beaufschlagt wird, in einem abgesenkten Zustand der Kammerwandung (18) erfolgt hierdurch eine Abdichtung der Kammerwandung (18) relativ zum Kammerdeckel (31) . Eine weitere Dichtung (35) ist in einem unteren Bereich der Kammerwandung (18) angeordnet, um auch hier eine Abdichtung relativ zum Kammerboden (29) zu gewährleisten. It can be seen in particular that the coupling channel (27) opens into a chamber lid (31) having a laterally projecting flange (32). In the region of the flange (32) a seal (33) is arranged, which is acted upon by an inner flange (34) of the chamber wall (18), in a lowered state of the chamber wall (18) thereby sealing the chamber wall (18) relative to Chamber lid (31). A further seal (35) is arranged in a lower region of the chamber wall (18), in order to ensure a seal here relative to the chamber bottom (29).
In der in Fig. 6 dargestellten Positionierung umschließt die Kammerwandung (18) die Kavität (4), so daß sowohl ein Innenraum der Kavität (4) als auch ein Innenraum des Werkstückes (5) evakuiert werden können. Zur Unterstützung einer Zuleitung von Prozeßgas ist im Bereich des Kammersok- kels (30) eine hohle Gaslanze (36) angeordnet, die in den Innenraum des Werkstückes (5) hineinverfahrbar ist. Zur Durchführung einer Positionierung der Gaslanze (36) wird diese von einem Lanzenschlitten (37) gehaltert, der entlang der Führungsstangen (23) positionierbar ist. Innerhalb des Lanzenschlittens (37) verläuft ein Prozeßgaskanal (38) , der in der in Fig. 6 dargestellten angehobenen Positionierung mit einem Gasanschluß (39) des Kammersockels (30) gekoppelt ist , Durch diese Anordnung werden schlauchartige Verbindungselemente am Lanzenschlitten (37) vermieden. Alternativ zur vorstehend erläuterten Konstruktion der Plasmastation ist es erfindungsgemäß aber auch möglich, das Werkstück (5) in eine relativ zur zugeordneten Tragstruktur unbewegliche Plasmakammer (17) einzuführen. Ebenfalls ist es möglich, alternativ zur dargestellten Beschichtung der Werkstücke (5) mit ihren Mündungen in lotrechter Richtung nach unten eine Beschichtung der Werkstücke mit ihren Mündungen in lotrechter Richtung nach oben durchzuführen. Insbesondere ist daran gedacht, eine Beschichtung von fla- schenförmigen Werkstücken (5) durchzuführen. Derartige Flaschen sind ebenfalls bevorzugt aus einem thermoplastischen Kunststoff ausgebildet. Vorzugsweise ist an die Verwendung von PET oder PP gedacht. Gemäß einer weiteren bevorzugten Ausführungsform dienen die beschichteten Flaschen zur Aufnahme von Getränken. In the positioning shown in FIG. 6, the chamber wall (18) surrounds the cavity (4), so that both an interior of the cavity (4) and an interior of the workpiece (5) can be evacuated. To support a supply of process gas, a hollow gas lance (36) is arranged in the region of the chamber cup (30) and can be moved into the interior of the workpiece (5). To carry out a positioning of the gas lance (36), it is supported by a lance carriage (37) which can be positioned along the guide rods (23). Within the lance carriage (37) extends a process gas channel (38) which is coupled in the raised position shown in Fig. 6 with a gas port (39) of the chamber base (30). By this arrangement hose-like connecting elements on the lance carriage (37) are avoided. As an alternative to the above-described construction of the plasma station, it is also possible according to the invention to introduce the workpiece (5) into a plasma chamber (17) immovable relative to the associated support structure. It is also possible, as an alternative to the illustrated coating of the workpieces (5) with their mouths in the vertical direction down to perform a coating of the workpieces with their mouths in the vertical direction upwards. In particular, it is intended to carry out a coating of bottle-shaped workpieces (5). Such bottles are also preferably formed from a thermoplastic material. Preferably, the use of PET or PP is intended. According to a further preferred embodiment, the coated bottles serve to receive drinks.
Ein typischer Behandlungsvorgang wird im folgenden am Beispiel eines BeschichtungsVorganges erläutert und derart durchgeführt, daß zunächst das Werkstück (5) unter Verwendung des Eingaberades (11) zum Plasmarad (2) transportiert wird und daß in einem hochgeschobenen Zustand der hülsenartigen Kammerwandung (18) das Einsetzen des Werkstückes (5) in die Plasmastation (3) erfolgt. A typical treatment process is explained below using the example of a coating process and carried out such that first the workpiece (5) using the input wheel (11) is transported to the plasma wheel (2) and that in a pushed-up state of the sleeve-like chamber wall (18) the insertion of the workpiece (5) into the plasma station (3).
Nach einem Abschluß des Einsetzvorganges wird die Kammerwandung (18) in ihre abgedichtete Positionierung abgesenkt und zeitlich versetzt folgt eine Verschiebung des Halteelementes (28) , so daß eine Abschottung des Innenraumes des Werkstückes (5) gegenüber dem Innenraum der Kavität (4) entsteht. Anschließend wird die Gaslanze (36) in den Innenraum des Werkstückes eingefahren. Ebenfalls ist es möglich, die Gaslanze (36) bereits synchron zur beginnenden Absenkung der Kavität (4) in den Innenraum des Werkstücks (5) hinein zu verfahren. Es folgt eine gleichzeitige oder zeit- lieh versetzte Evakuierung der Kavität (4) sowie vom Innenraum des Werkstückes (5) . Nach einer ausreichenden Evakuierung des Innenraumes der Kavität (4) wird der Druck im Innenraum des Werkstückes (5) anschließend noch weiter abgesenkt. Darüber hinaus ist auch daran gedacht, die Positionierbewegung der Gaslanze (36) wenigstens teilweise bereits parallel zur Positionierung der Kammerwandung (18) durchzuführen. After completion of the insertion process, the chamber wall (18) is lowered into its sealed positioning and offset in time follows a displacement of the holding element (28), so that a foreclosure of the interior of the workpiece (5) relative to the interior of the cavity (4). Subsequently, the gas lance (36) is retracted into the interior of the workpiece. It is also possible to move the gas lance (36) into the interior of the workpiece (5) already synchronously with the commencement of the lowering of the cavity (4). It follows a simultaneous or temporary lent evacuated evacuation of the cavity (4) and from the interior of the workpiece (5). After a sufficient evacuation of the interior of the cavity (4), the pressure in the interior of the workpiece (5) is then further lowered. In addition, it is also intended to carry out the positioning movement of the gas lance (36) at least partially already parallel to the positioning of the chamber wall (18).
Nach Erreichen eines ausreichend tiefen Unterdruckes wird Prozeßgas in den Innenraum des Werkstückes (5) eingeleitet und mit Hilfe des Mikrowellengenerators (19) das Plasma gezündet. Insbesondere ist daran gedacht, mit Hilfe des Plasmas sowohl einen Haftvermittler auf eine innere Oberfläche des Werkstückes (5) als auch die eigentliche Barriereschicht aus Siliziumoxiden abzuscheiden. After reaching a sufficiently low negative pressure process gas is introduced into the interior of the workpiece (5) and ignited with the aid of the microwave generator (19) the plasma. In particular, it is envisaged to deposit both an adhesion promoter on an inner surface of the workpiece (5) and the actual barrier layer of silicon oxides with the aid of the plasma.
Nach Abschluß des Beschichtungsvorganges wird die Plasmakammer (17) sowie der Innenraum des Werkstückes (5) belüftet. Nach Erreichen des Umgebungsdruckes innerhalb der Kavität (4) und im Innenraum des Werkstückes (5) wird die Kammerwandung (18) wieder angehoben und die Gaslanze (36) wieder aus dem Innenraum des Werkstückes (5) entfernt. Eine Entnahme des beschichteten Werkstückes (5) sowie eine Eingabe eines neuen zu beschichtenden Werkstückes (5) kann nun durchgeführt werden. After completion of the coating process, the plasma chamber (17) and the interior of the workpiece (5) is vented. After reaching the ambient pressure within the cavity (4) and in the interior of the workpiece (5), the chamber wall (18) is raised again and the gas lance (36) again removed from the interior of the workpiece (5). A removal of the coated workpiece (5) and an input of a new workpiece to be coated (5) can now be performed.
Eine Positionierung der Kammerwandung (18) , des Dichtelementes (28) und / oder der Gaslanze (36) kann unter Verwendung unterschiedlicher Antriebsaggregate erfolgen. Grundsätzlich ist die Verwendung pneumatischer Antriebe und / oder elektrischer Antriebe, insbesondere in einer Ausführungsform als Linearmotor, denkbar. Insbesondere ist aber daran gedacht, zur Unterstützung einer exakten Bewegungsko- ordinierung mit einer Rotation des Plasmarades (2) eine Kurvensteuerung zu realisieren. Die Kurvensteuerung kann beispielsweise derart ausgeführt sein, daß entlang eines Umfanges des Plasmarades (2) Steuerkurven angeordnet sind, entlang derer Kurvenrollen geführt werden. Die Kurvenrollen sind mit den jeweils zu positionierenden Bauelementen gekoppelt . A positioning of the chamber wall (18), the sealing element (28) and / or the gas lance (36) can be carried out using different drive units. In principle, the use of pneumatic drives and / or electric drives, in particular in one embodiment as a linear motor, conceivable. In particular, however, it is intended to support an exact movement ordination with a rotation of the plasma wheel (2) to realize a curve control. The cam control may for example be designed such that along a circumference of the plasma wheel (2) control cams are arranged along which cam rollers are guided. The cam rollers are coupled to the respective components to be positioned.
Fig. 7 veranschaulicht die Anzahl einer Mehrzahl von Prozeßgaskanälen (40) im Bereich des Maschinensockels (15) . Die Prozeßgaskanäle (40) weisen jeweils einen Boden (41) und Seitenwände (42) auf, die fest mit dem Maschinensockel (15) verbunden sind. Dem Boden (41) gegenüberliegend ist eine Abdeckung (43) angeordnet, die als Teil des Plasmarades (2) ausgebildet ist. Die Abdeckung (43) ist abgedichtet gegenüber den Seitenwänden (42) geführt. Fig. 7 illustrates the number of a plurality of process gas channels (40) in the region of the machine base (15). The process gas channels (40) each have a bottom (41) and side walls (42) fixedly connected to the machine base (15). Opposite the bottom (41) is a cover (43) arranged as part of the plasma wheel (2). The cover (43) is sealed against the side walls (42) out.
Im Bereich der Abdeckung (43) sind Verbindungsöffnungen (44) angeordnet, die in die Prozeßgaskanäle (40) einmünden. Die Verbindungsöffnungen (44) sind jeweils über Verbindungskanäle (45) mit Steuerventilen (46) gekoppelt. In the region of the cover (43) connecting openings (44) are arranged, which open into the process gas channels (40). The connection openings (44) are each coupled via connection channels (45) with control valves (46).
Die Steuerventile (46) steuern eine Verbindung der Plasmastationen (3) mit den Prozeßgaskanälen (40) und somit auch mit den zugeordneten Prozeßgasversorgungen, insbesondere ist daran gedacht, die Steuerventile (46) im Bereich eines Ventilblockes (47) anzuordnen, der seinerseits mit dem Kammersockel (30) verbunden ist. The control valves (46) control a connection of the plasma stations (3) with the process gas channels (40) and thus with the associated process gas supplies, in particular, it is intended to arrange the control valves (46) in the region of a valve block (47), in turn with the Chamber socket (30) is connected.
Bei einer Anordnung von mehreren Kavitäten (4) im Bereich der Plasmastation (3) sind im Bereich des Ventilblockes (47) Kanalverzweigungen angeordnet, um ein bestimmtes Prozeßgas über jeweils nur ein Steuerventil (46) der Mehrzahl an Kavitäten (4) zuführen zu können bzw. ein Anschluß an eine Unterdruckversorgung zu realisieren. In the case of an arrangement of a plurality of cavities (4) in the region of the plasma station (3), channel branches are arranged in the region of the valve block (47) to supply a specific process gas via only one control valve (46) of the plurality to be able to supply to cavities (4) or to realize a connection to a vacuum supply.
Typischerweise erstrecken sich die Prozeßgaskanäle (40) konzentrisch zu einem Mittelpunkt des Plasmarades (2) . Im dargestellten Ausführungsbeispiel sind die ProzeßgaskanäleTypically, the process gas channels (40) extend concentrically with a center of the plasma wheel (2). In the illustrated embodiment, the process gas channels
(40) nach oben offen und werden im Bereich ihrer oberen Ausdehnung mit der Abdeckung (43) versehen. Grundsätzlich ist aber auch jede andere räumliche Orientierung der Prozeßgaskanäle (40) denkbar, beispielsweise mit der Abdeckung(40) open at the top and are provided in the region of their upper extension with the cover (43). In principle, however, any other spatial orientation of the process gas channels (40) is conceivable, for example with the cover
(43) unterhalb der Prozeßgaskanäle oder neben den Prozeßgaskanälen. (43) below the process gas channels or beside the process gas channels.
Fig. 8 veranschaulicht eine Plasmastation (3) mit vier Kavitäten (4) . Der Mikrowellengenerator (19) weist typischerweise eine Anzahl von Mikrowellenmodulen (48) auf, die der Anzahl der Kavitäten (4) entspricht. Hierdurch kann jeder der Kavitäten (4) ein separates Mikrowellenmodul (48) zugeordnet werden. Fig. 8 illustrates a plasma station (3) with four cavities (4). The microwave generator (19) typically has a number of microwave modules (48) corresponding to the number of cavities (4). In this way, each of the cavities (4) can be assigned a separate microwave module (48).
Eine Positionierung der Kammerwandung (18) erfolgt gemäß einer bevorzugten Aus ührungsform mechanisch unter Verwendung einer Kurvensteuerung. Entlang einer entsprechenden Kurvenbahn wird hierbei eine mit der Kammerwandung (18) verbundene Kurvenrolle (49) geführt. A positioning of the chamber wall (18) takes place according to a preferred embodiment of the invention mechanically using a cam control. Along a corresponding cam track, a cam roller (49) connected to the chamber wall (18) is guided in this case.
Für die Positionierung des Lanzenschlittens (37) wird bevorzugt ebenfalls eine mechanische Kurvensteuerung verwendet. Der Lanzenschlitten (37) ist hierzu mit einer Kurvenrolle (50) versehen. For the positioning of the lance carriage (37), a mechanical cam control is preferably also used. The lance carriage (37) is provided for this purpose with a cam roller (50).
Eine Positionierung der in Fig. 8 nicht zu erkennenden Gas- lanzen (36) relativ zum Lanzenschlitten (37) erfolgt bevorzugt unter Verwendung eines Pneumatikzylinders (51) Durch die Kombination der mechanischen Steuerung sowie der pneumatischen Steuerung lassen sich die Vorgänge des Abdichtens der Kavitäten (4) und der Werkstücke (5) sowie das eigentliche Einfahren der Gaslanzen (36) in die Werkstücke (5) hinein entkoppeln. Positioning of the gas lances (36), which are not visible in FIG. 8, relative to the lance carriage (37) is preferably carried out using a pneumatic cylinder (51) the combination of the mechanical control and the pneumatic control can decouple the operations of sealing the cavities (4) and the workpieces (5) and the actual retraction of the gas lances (36) into the workpieces (5).
Fig. 9 zeigt eine perspektivische Darstellung des Ventil- blockes (47) . Es ist zu erkennen, daß eine Tragplatte (52) , die die Steuerventile (46) trägt, relativ zu einem Basiselement (53) verschwenkbar angeordnet ist. Hierzu ist ein Schwenkgelenk (54) verwendet. Das Schwenkgelenk (54) wird vorzugsweise auf einer Seite des Basiselementes (53) angeordnet, die in einer radialen Richtung des Plasmarades (2) innenliegend ist. Bei dem in Fig. 9 dargestellten hochgeklappten Betriebszustand sind hierdurch Unterseiten der Steuerventile (56) sowie im Bereich des Basiselementes (53) angeordnete Ventilsitze gut zugänglich und können gereinigt werden. 9 shows a perspective view of the valve block (47). It will be appreciated that a support plate (52) supporting the control valves (46) is pivotally mounted relative to a base member (53). For this purpose, a pivot joint (54) is used. The pivot (54) is preferably disposed on a side of the base member (53) that is inboard in a radial direction of the plasma wheel (2). In the folded-up operating state shown in FIG. 9, undersides of the control valves (56) and valve seats arranged in the region of the base element (53) are easily accessible and can be cleaned.
Nach einem Zurückschwenken der Tragplatte (52) in eine geschlossene Positionierung wird die Tragplatte (52) relativ zum Basiselement (53) von einem Fixierelement (55) arretiert. Das Fixierelement (55) kann als eine Schraube ausgebildet sein. After a pivoting back of the support plate (52) in a closed position, the support plate (52) relative to the base member (53) by a fixing element (55) is locked. The fixing element (55) may be formed as a screw.
Eine Anordnung der einzelnen Prozeßgaskanäle (40) in einer radialen Richtung des Plasmarades (2) erfolgt vorzugsweise in Abhängigkeit vom jeweils maßgeblichen strömungstechnischen Leitwert. Hierunter versteht man den Quotienten aus Volumenstrom und Druck. Je größer dieser Leitwert ist, umso kritischer werden die vakuumtechnischen Anforderungen. Dies bedeutet, daß mit zunehmendem volumenströmen bzw. abnehmenden Drücken erhöhte Anforderungen gestellt werden. Radial innenliegend und somit am weitesten von der Plasmastation (3) entfernt wird der Prozeßgaskanal (40) mit dem relativ höchsten Unterdrück angeordnet. Hier liegt der geringste vakuumtechnische Leitwert vor. In radialer Richtung des Plasmarades (2) nach außen und somit mit geringeren Abständen zur Plasmastation (3) folgen dann die Prozeßgasversorgungen mit zunehmenden zu berücksichtigenden Leitwerten. An arrangement of the individual process gas channels (40) in a radial direction of the plasma wheel (2) is preferably carried out as a function of the respectively relevant fluidic conductance. This is understood as the quotient of volume flow and pressure. The larger this conductance, the more critical the vacuum technology requirements become. This means that with increasing volume flow or decreasing pressures increased demands are made. Located radially inwardly and thus farthest from the plasma station (3), the process gas channel (40) is arranged with the relatively highest suppression. Here is the lowest vacuum technical conductance. In the radial direction of the plasma wheel (2) to the outside and thus with smaller distances to the plasma station (3) then follow the process gas supplies with increasing to be considered conductance.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Vorrichtung zur Plasmabehandlung von Werkstücken, die mindestens eine evakuierbare Plasmakammer zur Aufnahme der Werkstücke aufweist und bei der die Plasmakammer im Bereich einer Behandlungsstation angeordnet ist, sowie bei der die Plasmakammer von einem Kammerboden, einem Kammerdeckel sowie einer seitlichen Kammerwandung begrenzt ist und bei der die Plasmakammer mit einer Einrichtung zur steuerbaren Zuführung und/oder Ableitung von Prozeßgasen gekoppelt ist, dadurch gekennzeichnet, daß die Plasmakammer (17) auf einem rotationsfähigen Plasmarad (2) angeordnet ist, das von einem stationären Sockel (15) gelagert ist und daß im Bereich des Sockels (15) mindestens ein Prozeßgaskanal (40) angeordnet ist, der mindestens bereichsweise von einer Abdeckung (43) begrenzt ist, die als Teil des Plasmarades (2) ausgebildet ist, sowie daß die Abdeckung (43) mindestens eine Verbindungsöffnung (44) zum Prozeßgaskanal (40) auf- weist, die über einen Verbindungskanal (45) und mindestens ein Steuerventil (46) mit einem Innenraum der Plasmakammer (17) koppelbar ist. 1. Apparatus for plasma treatment of workpieces, which has at least one evacuatable plasma chamber for receiving the workpieces and in which the plasma chamber is arranged in the region of a treatment station, and in which the plasma chamber is bounded by a chamber bottom, a chamber lid and a lateral chamber wall and in the the plasma chamber is coupled to a device for the controllable supply and / or discharge of process gases, characterized in that the plasma chamber (17) is arranged on a rotatable plasma wheel (2) which is supported by a stationary base (15) and in the region at least one process gas channel (40) is arranged at least partially bounded by a cover (43) formed as part of the plasma wheel (2), and in that the cover (43) has at least one connection opening (44). to the process gas channel (40) has, which via a connecting channel (45) and at least one control valve (46) with an interior of the plasma chamber (17) is coupled.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sich der Prozeßgaskanal (40) im Wesentlichen konzentrisch zu einer Rotationsachse des Plasmarades (2) erstreckt . 2. Apparatus according to claim 1, characterized in that the process gas channel (40) extends substantially concentric to a rotational axis of the plasma wheel (2).
3. Vorrichtung nach Anspruch 1 oder 2 , dadurch gekennzeichnet, daß das Steuerventil (46) im Bereich eines Ventilblockes (47) angeordnet ist. 3. Device according to claim 1 or 2, characterized in that the control valve (46) in the region of a valve block (47) is arranged.
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß sich innerhalb des Ventilblockes (47) mindestens ein das Steuerventil (46) mit der Plasmastation (3) verbindender Kanal erstreckt, 4. Device according to one of claims 1 to 3, characterized in that within the valve block (47) extends at least one connecting the control valve (46) with the plasma station (3) channel,
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Kanal mindestens eine KanalVerzweigung zur Verbindung des Steuerventils (46) mit mindestens zwei Ka- vitäten (4) aufweist. 5. Apparatus according to claim 4, characterized in that the channel has at least one channel branch for connecting the control valve (46) with at least two ka- vitäten (4).
6. Vorrichtung nach einem der Ansprüche 1 bis 5 , dadurch gekennzeichnet, daß die Kavitäten (4) reihenartig entlang eines Umfanges des Plasmarades (2) angeordnet sind. 6. Device according to one of claims 1 to 5, characterized in that the cavities (4) are arranged in rows along a circumference of the plasma wheel (2).
7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß eine Kammerwandung (18) der Plasmastation (3) in einer vertikalen Richtung positionierbar angeordnet ist. 7. Device according to one of claims 1 to 6, characterized in that a chamber wall (18) of the plasma station (3) is arranged positionable in a vertical direction.
8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß ein Mikrowellengenerator (19) relativ zu einem Stations ahmen (16) der Plasmastation (3) unbeweglich angeordnet ist. 8. Device according to one of claims 1 to 7, characterized in that a microwave generator (19) relative to a station ahamen (16) of the plasma station (3) is arranged immovably.
9. Vorrichtung nach Anspruch 1 bis 8, dadurch gekennzeichnet, daß der Plasmakanal (40) relativ zur Plasmastation (3) innenliegend auf dem Plasmarad (2) angeordnet ist. 9. Apparatus according to claim 1 to 8, characterized in that the plasma channel (40) relative to the plasma station (3) is arranged on the inside of the plasma bath (2).
10. Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der Prozeßgaskanal (40) eine im Wesentlichen rechteckförmige Querschnittfläche aufweist und in lotrechter Richtung nach oben von der Abdeckung (43) begrenzt ist. 10. Device according to one of claims 1 to 9, characterized in that the process gas channel (40) has a substantially rectangular cross-sectional area and in the vertical direction is bounded above by the cover (43).
EP11754610.1A 2010-06-07 2011-06-03 Device for plasma treatment of workpieces Withdrawn EP2576857A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010023119A DE102010023119A1 (en) 2010-06-07 2010-06-07 Apparatus for the plasma treatment of workpieces
PCT/DE2011/001158 WO2011153993A1 (en) 2010-06-07 2011-06-03 Device for plasma treatment of workpieces

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JP (1) JP5789659B2 (en)
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WO (1) WO2011153993A1 (en)

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US20130186336A1 (en) 2013-07-25
JP2013534565A (en) 2013-09-05
DE102010023119A1 (en) 2011-12-22
JP5789659B2 (en) 2015-10-07
WO2011153993A1 (en) 2011-12-15

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