EP3106006B1 - Verfahren und vorrichtung zur behandlung von stücken zur erhöhung der haftung - Google Patents

Verfahren und vorrichtung zur behandlung von stücken zur erhöhung der haftung Download PDF

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Publication number
EP3106006B1
EP3106006B1 EP15702478.7A EP15702478A EP3106006B1 EP 3106006 B1 EP3106006 B1 EP 3106006B1 EP 15702478 A EP15702478 A EP 15702478A EP 3106006 B1 EP3106006 B1 EP 3106006B1
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EP
European Patent Office
Prior art keywords
parts
electrode
plasma
corona
station
Prior art date
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Active
Application number
EP15702478.7A
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English (en)
French (fr)
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EP3106006A1 (de
Inventor
Antoine Antoine
Nathalie SENINCK
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.)
Systeme Et Technologies De Traitement De Surface
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Systeme Et Technologies De Traitement De Surface
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/10—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an adhesive surface
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/47—Generating plasma using corona discharges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
    • B05D3/141—Plasma treatment
    • B05D3/142—Pretreatment
    • B05D3/144—Pretreatment of polymeric substrates
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/47—Generating plasma using corona discharges
    • H05H1/471—Pointed electrodes

Definitions

  • the present invention relates to a method of treating parts in order to increase the adhesion properties of the surface of the parts. It also relates to an installation implementing said method.
  • references in square brackets ([]) refer to the list of references presented at the end of the text.
  • the wettability of the surfaces of parts made of synthetic material is often insufficient to apply and directly adhere to them a varnish, glue, ink or adhesive.
  • a modification of the surface structure must be made. This modification can be mechanical by abrasion, chemical, by a flame to attach carboxylic bonds or by electric potential discharge. Wettability is characterized by the physical magnitude of the surface tension. Similar problems arise for metal surfaces which may be covered with a film or traces of foreign material.
  • corona effect In the processes by electric potential discharge used in industry, there is the process known as the corona effect or the corona effect.
  • the corona effect can be produced in different ways: either between two electrodes which produce an arc which is blown by air to project it towards the surface to be treated, or by an electrode placed at a certain potential opposite a mass cylinder on which runs a plastic film to be treated.
  • a plasma atmospheric pressure and which is created by an electric discharge in a tube using air or gas. In practice, this system is called plasma torch or cold plasma at atmospheric pressure.
  • corona effect is often enough to modify the surface layer of the material on a few Angstroms in order to allow the adhesion of inks, glues, paints or varnishes. It should be noted that corona or corona discharge does not create heat and therefore does not cause the material to rise in temperature and that it occurs in ambient air at atmospheric pressure. It is also possible to use a mixture of gases or a specific gas passing through the corona discharge for certain applications.
  • the other electric discharge process is called an atmospheric pressure plasma or plasma torch. It is described for example in the document WO 2010/067306 A2 [2].
  • a tube called a plasma torch a luminescent electrical discharge or corona is created between an internal core brought to a certain electrical potential and the envelope of this tube connected to ground. Pressurized air or gas is injected inside this tube, which has the effect of creating turbulence separating the ionizing elements but giving the electrons a high temperature.
  • a potential-free flame-shaped plasma jet is formed, which is used as the corona effect to modify the surface state of the material to be treated over a few Angstroms. This plasma jet coming out of the tube is not very wide, it is circular.
  • This air or gas pressurized plasma surface treatment system is widely used in industry. It is also called cold plasma or atmospheric pressure plasma.
  • the invention aims to provide a method of treating parts such as for example plates in order to increase the wettability and adhesion of the surface which can treat thick parts and even if they contain agents that have migrated to the surface. It also aims to provide an installation implementing said method.
  • the document US2008 / 237935 A1 discloses an example of a device and associated method for the treatment by corona effect of polyolefin sheets previously treated by plasma.
  • the invention relates to a method of surface treatment of parts according to which thick parts are treated by the directional discharge corona effect by making the parts scroll relative to the corona station in a direction of travel, characterized in that, prior to the corona effect treatment, the parts are prepared by plasma.
  • the Applicant has discovered that, surprisingly, while the treatment by plasma alone or by directional discharge corona effect alone is not able to impart sufficient surface tension, regardless of the duration of the treatment, the combination of the plasma treatment followed by directional discharge corona treatment provides a much better surface tension. Such a phenomenon could be explained by the fact that the plasma treatment eliminates the interface which covers the part to be treated, which makes the surface accessible to the corona effect treatment.
  • an installation comprising at least one electrode comprising tips aligned along an electrode path, the tips projecting in a tip direction towards the moving parts, is used, the tip direction being substantially perpendicular to the direction of travel, the electrode being placed between two counter-electrodes at a distance of the same distance.
  • the direction of travel is perpendicular to the electrode path.
  • the entire width of the room can be processed at one time.
  • the electrode is driven in an alternating movement perpendicular to the direction of travel. This makes it possible to cover a surface more homogeneously.
  • the plasma treatment is generated by at least one torch moving in a lateral reciprocating movement perpendicular to the direction of travel. This movement is also allowed to cover a surface more evenly.
  • an electrode comprising an active surface facing the parts to be treated is used to generate a directional discharge corona effect, a dielectric insulator being placed between the electrode and the parts.
  • a dielectric insulator being placed between the electrode and the parts.
  • Such an electrode is suitable for treating conductive parts.
  • the parts are for example connected to ground, while the electrode is energized.
  • the parts to be treated are for example made of synthetic material, insulating or conductive, or metallic.
  • the subject of the invention is also an installation for processing thick parts comprising a corona treatment station by the directional discharge corona effect, the installation comprising actuating means for making the parts scroll relative to the corona station, the installation being characterized in that it further comprises a plasma station upstream of the corona station, the plasma station comprising at least one plasma torch for sending a flow of plasma towards the moving parts.
  • the corona station comprises an electrode comprising points projecting in a point direction, the electrode being placed between two remote counter-electrodes at the same distance, the movement of the parts taking place in a plane perpendicular to the point. leading edge.
  • the corona station comprises a plurality of electrodes arranged parallel to one another, the tips of one electrode being offset from the tips of an adjacent electrode with respect to the direction of travel.
  • the installation comprises a plasma station 1 and furthermore a corona station 3 for treatment by the directional discharge corona effect.
  • the installation comprises actuating means for scrolling the parts 2 facing the plasma station 1 then the corona station 3 in a direction of travel F1.
  • the plasma station 1 comprises at least one plasma torch 10 for sending a flow of plasma to the moving parts 2.
  • the corona station 3 comprises a plurality of electrodes 30, 30 'arranged parallel to each other, as shown in figure 3 . On the figure 2 , only one electrode is shown. Each electrode 30 comprises tips 301 electrically connected and projecting in a tip direction F2 substantially perpendicular to the direction of travel F1. The electrode 30 is placed between two counter-electrodes 31 so as to be midway between them.
  • the tips 301 of an electrode 30 are offset from the tips 301 'of an adjacent electrode 30', as shown in FIG. figure 3 .
  • the counter electrodes are not shown in this view.
  • the plasma station 1 also comprises several plasma torches 10, only one of which is shown, in order to cover the entire width of the moving parts 2.
  • the parts 2 are set in motion by the displacement means so as to scroll facing the plasma station 1 and then facing the corona station 3.
  • the plasma torches 10 are activated.
  • the electrodes 30 of the corona station 3 are energized with a high voltage current, greater than 12 kV, and high frequency, of the order of several tens of kilohertz. Corona effluvia develop between the electrode 30 and the counter-electrodes 31.
  • the moving parts 2 are exposed first to the flows of the plasma torches 10 and then to the corona scents.
  • the running speed is adjusted so that the temperature of the surface of the parts 2 does not rise excessively with respect to the plasma torches 10, but that the interface or the layers of undesirable products are eliminated or transformed.
  • Parts 2 injected in polyethylene containing 2% of an amide-based slip agent were treated respectively by a corona 3 station alone, by a plasma station 1 alone and by the successive combination of the two treatments, starting with the plasma station 1.
  • the figure 1 shows spectrograms of the surface of the parts 2 thus treated, in comparison with an untreated part.
  • the diagram shows a transmittance as a function of a frequency, expressed in cm -1 .
  • the measurements were made with an infrared spectrometer using a mercury-cadmium telluride (MCT) cell and an attenuated total reflection (ATR) germanium crystal.
  • MCT mercury-cadmium telluride
  • ATR attenuated total reflection
  • the characteristic bands of polyethylene are present, in particular that at 1464 cm -1 as shown on the figure 1 .
  • peaks at 3400, 3200 cm -1 and 1645 cm -1 show the presence of amide compounds originating from the slip agent.
  • the spectrum is substantially the same, with the presence of the slip agent.
  • a wide band between 1600 and 1700 cm -1 indicates an additional degree of carbon oxidation.
  • a pronounced peak at 1650 cm -1 suggests the presence of degraded residues of the slip agent.
  • a wide band around 3280 cm -1 indicates the clear presence of hydroxyl groups on the polyethylene.
  • sample with the plasma treatment followed by the corona treatment has a surface tension greater than 56 mN / m to allow adhesion of ink, glue or adhesive.
  • the electrode 30 has an active surface facing the parts 2 "to be treated with an insulator.
  • dielectric 7 disposed between the electrode 30 "and the parts 2", as shown on the figure 4 .
  • Electrode 30 " is energized while part 2" is connected to ground.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Plasma Technology (AREA)

Claims (6)

  1. Verfahren zur Oberflächenbehandlung von Teilen (2), bei dem dicke Teile (2) durch gerichtete KoronaEntladung behandelt werden, indem die Teile (2) in Bezug auf die Korona-Station (3) in einer Durchlaufrichtung (F1) durchlaufen lassen werden, in der die Teile (2) vor der Korona-Entladungs-Behandlung durch Plasma vorbereitet werden;
    wobei das Verfahren dadurch gekennzeichnet ist, dass
    - zum Erzeugen der Wirkung der gerichteten Korona-Entladungs-Behandlung eine Vorrichtung verwendet wird, die mindestens eine Elektrode (30) beinhaltet, die Spitzen (301) beinhaltet, die entlang eines Elektrodenpfades ausgerichtet sind, wobei die Spitzen (301) in einer Spitzenrichtung (F2) zu den durchlaufenden Teilen (2) hin hervorstehen, die Spitzenrichtung (F2) im Wesentlichen senkrecht zu der Durchlaufrichtung (F1) verläuft, die Elektrode (30) zwischen zwei Gegenelektroden (31) platziert ist, die um eine selbe Abweichung beabstandet sind;
    - die Durchlaufrichtung (F1) senkrecht zum Elektrodenpfad verläuft;
    - die Elektrode (30) zu einer Hin- und Herbewegung senkrecht zur Durchlaufrichtung (F1) angeregt wird.
  2. Verfahren nach Anspruch 1, wobei die Behandlung durch Plasma durch mindestens einen Brenner (10) erzeugt wird, der zu einer seitlichen Hin- und Herbewegung, senkrecht zur Durchlaufrichtung (F1), angeregt wird.
  3. Verfahren nach Anspruch 1, wobei zum Erzeugen der Wirkung der gerichteten Korona-Entladungs-Behandlung eine Elektrode verwendet wird, die eine aktive Oberfläche gegenüber den zu behandelnden Teilen (2") beinhaltet, wobei eine dielektrische Isolierung (7) zwischen der Elektrode und den Teilen (2") angeordnet ist.
  4. Verfahren nach Anspruch 1, wobei die zu behandelnden Teile (2) aus einem isolierenden synthetischen Werkstoff oder aus einem leitfähigen synthetischen Werkstoff sind.
  5. Verfahren nach Anspruch 1, wobei die zu behandelnden Teile (2) aus Metall sind.
  6. Vorrichtung zur Behandlung von dicken Teilen (2), die zur Umsetzung des Verfahrens nach einem der Ansprüche 1 bis 5 angepasst ist, wobei die Vorrichtung eine Korona-Station (3) zur Behandlung durch gerichtete Korona-Entladungs-Wirkung beinhaltet, die Vorrichtung Betätigungsmittel beinhaltet, um die Teile (2) in Bezug auf die Korona-Station (3) durchlaufen zu lassen, eine Plasma-Station (1) stromaufwärts der Korona-Station (3), wobei die Plasma-Station (1) mindestens einen Plasmabrenner (10) zum Ausschicken eines Plasmaflusses zu den durchlaufenden Teilen (2) beinhaltet, wobei die Vorrichtung dadurch gekennzeichnet ist, dass sie weiter Folgendes beinhaltet
    - mindestens eine Elektrode (30), die Spitzen (301) beinhaltet, die in einer Spitzenrichtung (F2) hervorstehen, wobei die Elektrode (30) zwischen zwei Gegenelektroden (31) platziert ist, die um eine selbe Abweichung beabstandet sind, wobei der Durchlauf der Teile (2) entlang einer Ebene senkrecht zur Spitzenrichtung (F2) erfolgt,
    - eine Vielzahl von Elektroden, die parallel zueinander angeordnet sind, wobei die Spitzen (301) einer Elektrode (30) zu den Spitzen (301) einer in Bezug auf die Durchlaufrichtung (F1) benachbarten Elektrode (30) verschoben sind.
EP15702478.7A 2014-02-10 2015-02-03 Verfahren und vorrichtung zur behandlung von stücken zur erhöhung der haftung Active EP3106006B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1451022A FR3017314B1 (fr) 2014-02-10 2014-02-10 Procede et installation de traitement de pieces afin d'augmenter l'adherence.
PCT/EP2015/052163 WO2015117942A1 (fr) 2014-02-10 2015-02-03 Procédé et installation de traitement de pièces afin d'augmenter l'adhérence

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Publication Number Publication Date
EP3106006A1 EP3106006A1 (de) 2016-12-21
EP3106006B1 true EP3106006B1 (de) 2021-05-12

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EP (1) EP3106006B1 (de)
FR (1) FR3017314B1 (de)
WO (1) WO2015117942A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI104645B (fi) * 1998-08-19 2000-03-15 Valmet Corp Menetelmä ja sovitelma paperin tai kartongin ohjaamiseksi valmistuksen aikana
DE10022306A1 (de) * 2000-05-09 2001-11-29 Trespaphan Gmbh Transparente biaxial orientierte Polyolefinfolie mit verbesserten Hafteigenschaften
DE102005052441C5 (de) * 2005-11-03 2013-05-16 Treofan Germany Gmbh & Co. Kg Verfahren zur Erhöhung der Oberflächenspannung einer biaxial orientierten Folie aus thermoplastischen Polymeren, sowie Verfahren zur Herstellung von bedruckten, metallisierten, laminierten, kaschierten oder beschichteten Folien, hergestellt nach diesem Verfahren zur Erhöhung der Oberflächenspannung
JP2009279557A (ja) * 2008-05-26 2009-12-03 Able Corp イオン壁形成装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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WO2015117942A1 (fr) 2015-08-13
FR3017314B1 (fr) 2016-03-04
EP3106006A1 (de) 2016-12-21
FR3017314A1 (fr) 2015-08-14

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