WO2024078764A1 - Dispositif et procédé de durcissement d'une couche polymère sur un corps cylindrique - Google Patents

Dispositif et procédé de durcissement d'une couche polymère sur un corps cylindrique Download PDF

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Publication number
WO2024078764A1
WO2024078764A1 PCT/EP2023/070718 EP2023070718W WO2024078764A1 WO 2024078764 A1 WO2024078764 A1 WO 2024078764A1 EP 2023070718 W EP2023070718 W EP 2023070718W WO 2024078764 A1 WO2024078764 A1 WO 2024078764A1
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WO
WIPO (PCT)
Prior art keywords
curing
inert gas
light
gap
substrate
Prior art date
Application number
PCT/EP2023/070718
Other languages
German (de)
English (en)
Inventor
Christoph Gschossmann
Oliver Fechner
Original Assignee
Maschinenfabrik Kaspar Walter Gmbh & Co. Kg
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
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Application filed by Maschinenfabrik Kaspar Walter Gmbh & Co. Kg filed Critical Maschinenfabrik Kaspar Walter Gmbh & Co. Kg
Publication of WO2024078764A1 publication Critical patent/WO2024078764A1/fr

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Classifications

    • 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
    • B05D3/06—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 exposure to radiation
    • B05D3/061—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 exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating
    • 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
    • B05D3/04—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 exposure to gases
    • B05D3/0466—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 exposure to gases the gas being a non-reacting gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
    • 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
    • B05D2254/00—Tubes
    • B05D2254/02—Applying the material on the exterior of the tube

Definitions

  • the invention relates to a curing device for curing a polymer layer on a cylindrical substrate.
  • Such a substrate can be, for example, a printing form that can be coated with a polymer coating material.
  • the term substrate or printing form is used below in particular as a generic term for gravure printing forms, relief printing forms or structural forms for embossing, but also for coating rollers or inking rollers.
  • a printing form and a polymer coating material for it are known from WO 2021/052641 Al.
  • the coating material is a polymer nanocomposite that can be built up as a single layer for printing forms.
  • the polymer nanocomposite is applied in flowable form to the cylindrical outside of the printing form and subsequently cured by irradiation with UV light.
  • the resulting polymer layer can be structured, for example, using infrared lasers to create a surface structure that has, for example, cells or structures for absorbing ink or for embossing, as is also described in WO 2021/052641 Al.
  • UV LEDs are increasingly being used, which rely on inerting the surface due to the predominant oxygen inhibition of the surface of the radical polymerization.
  • UV radiation curing should be provided regardless of format and size, while at the same time minimizing inert gas consumption.
  • the invention is therefore based on the object of specifying a hardening tool that can be used flexibly for different circumferences and format widths of cylindrical substrates.
  • the object is achieved according to the invention by a hardening device having the features of claim 1.
  • Advantageous embodiments are specified in the dependent claims.
  • a curing device for curing a polymer layer on a cylindrical substrate, with a UV light device for generating UV light and providing the UV light at a light opening; with a curing gap arranged in front of the light opening; with an inert gas supply device for supplying inert gas to the curing gap upstream of the light opening; with an inert gas flow through the curing gap; and with an oxygen measuring device for measuring the oxygen content in the inert gas downstream of the light opening.
  • the coated substrates can be rollers of all kinds, in particular printing forms, such as gravure forms or cylinders, structural forms or cylinders, embossing forms or cylinders and relief printing forms or cylinders or coating rollers as well as inking rollers, e.g. for flexographic printing.
  • printing forms such as gravure forms or cylinders, structural forms or cylinders, embossing forms or cylinders and relief printing forms or cylinders or coating rollers as well as inking rollers, e.g. for flexographic printing.
  • the polymer material was suitably applied to the outer surface of the substrate before the curing process and is still flowable in this state, i.e. before curing.
  • the polymeric coating material can, for example, be the material described in WO 2021/052641 Al.
  • the polymer can be a coating material for coating a printing form, comprising a liquid starting material that is polymerizable by UV light to form a polymer matrix, a filler that has a sub-microscale size, wherein the coating material contains a further filler in addition to the sub-microscale filler, wherein the sub-microscale filler is in particle form and its size is in a range between 100 nm and 999 nm, wherein the further filler is a nanoscale filler, such that the further filler has filler particles with a nanoscale size in a range between 1 nm and 99 nm, wherein the sub-microscale filler consists of at least one metal oxide and/or a semi-metal oxide selected from metal oxide-coated mica, TiO2 or (Sn, Sb)C>2, wherein the nanoscale filler is metal and/or semi-metal oxides selected from Al2O
  • the UV light device generates UV light that exits the light opening and from there can reach the polymer layer to be cured on the substrate directly.
  • the curing gap is arranged in front of the light opening and forms a narrow inerting and irradiation channel. The formation of the curing gap or channel can be ensured by means of precise positioning of the curing device relative to the polymer surface (and thus the substrate surface), as will be explained later.
  • the curing gap is at least partially open to the polymer layer to be cured.
  • the curing gap is at least partially open on its side facing the substrate.
  • the curing gap can have a gas inlet for letting in the inert gas and a gas outlet for discharging the inert gas.
  • the light opening is arranged opposite the polymer layer in order to enable curing of the polymer layer by irradiation with UV light.
  • the oxygen measuring device is used to measure the oxygen content in the inert gas discharged from the light opening.
  • the residual oxygen content in the inert gas is measured.
  • the inert gas In order to achieve the desired protective effect of the inert gas on the polymer layer, the inert gas must have a certain concentration, which can be determined indirectly by measuring the residual oxygen content in the inert gas stream.
  • the oxygen measuring device can have a lambda probe (Z probe). Based on the measurement results of the residual oxygen measurement, the required amount of inert gas can be set and supplied at the upstream end via the inert gas supply device. This ensures that there is always a sufficient supply of inert gas in the curing gap during UV irradiation. On the other hand, it can also prevent too much inert gas from being consumed, so that the curing process can be carried out economically and in a way that conserves resources.
  • Nitrogen is particularly suitable as an inert gas, as it provides sufficient inerting effect.
  • the curing device allows curing of a polymer layer on a cylindrical substrate, regardless of the shape or format of the substrate.
  • the light opening on the UV light device can be covered with UV-transparent quartz glass.
  • This quartz glass cover in front of the UV light device seals the gas flow in the curing gap so that inert gas cannot escape into the rest of the work area.
  • the UV light device can in particular be an LED-based light device in which UV light is generated with the help of LEDs.
  • a positioning device can be provided for positioning the UV light device.
  • positioning means holding and/or moving the curing device or the UV light device relative to the polymer layer to be cured or the substrate.
  • the desired curing gap should be maintained as precisely as possible in order to reliably ensure the supply of inert gas.
  • a distance measurement can be provided, which uses, for example, an inductive, capacitive or laser-based measuring principle.
  • the distance can be variably controlled or mechanically precisely set. This depends on the respective conditions when positioning the curing device relative to the substrate.
  • the positioning device can have a distance control device, wherein the distance control device has a distance measuring device for measuring the distance between the UV light device and a surface of the polymer layer and/or a surface of the substrate.
  • the distance control device can have a distance setting device for setting the distance of the UV light device to the surface of the polymer layer and/or the surface of the substrate such that the distance corresponds to a predetermined value.
  • a gas conveying device can be provided to generate the inert gas flow through the hardening gap.
  • the gas conveying device can be arranged in particular downstream of the hardening gap, whereby the gas conveying device can also be arranged downstream of the oxygen measuring device.
  • the inert gas flow can be generated by the action of the gas conveying device from the inert gas supply device through the hardening gap and the oxygen measuring device. device.
  • the gas conveying device can in particular have a fan with which a corresponding flow effect can be generated by sucking in the air and the inert gas.
  • the inert gas supply device can be designed to supply inert gas from an inert gas source to a gas inlet of the hardening gap, wherein the inert gas supply device can have a flushing nozzle for introducing the inert gas into the hardening gap, and wherein the inert gas supply device can have a calming section upstream of the gas inlet for reducing turbulent flows in the supplied inert gas.
  • the inert gas source can be, for example, a tank or a gas bottle.
  • the inert gas should be introduced over the entire width of the curing gap if possible in order to achieve a uniform, ideally laminar inert gas flow through the curing gap. This is possible with the help of the injector nozzle, which spreads the inert gas out accordingly.
  • a calming section can be provided as part of the inert gas supply device or the injector nozzle immediately before the inert gas enters the curing gap, with which the flow calms down and becomes largely laminar.
  • the injector nozzle can be implemented as a type of slot nozzle.
  • the inert gas supply device can have a mass flow controller for controlling the flow of inert gas from the inert gas source.
  • the mass flow controller can be used to precisely adjust the amount of inert gas that is supplied to the curing gap per unit of time.
  • a gas outlet Downstream of the hardening gap, a gas outlet can be provided through which inert gas exits the hardening gap, wherein a gas discharge device can be provided downstream of the gas outlet, wherein the gas discharge device can have a measuring chamber feed which is arranged at the gas outlet and via which inert gas exiting the hardening gap can be guided to a measuring chamber, and wherein the oxygen measuring device is designed to measure the oxygen content in the measuring device.
  • the gas outlet defines the end of the hardening gap.
  • part of the inert gas can be captured and discharged by the gas discharge device.
  • the remaining inert gas that is not captured escapes into the environment.
  • the part of the inert gas captured and discharged by the gas discharge device is led into the measuring chamber, where the oxygen measuring device measures the (residual) oxygen level. content in the inert gas.
  • a residual oxygen control device can be provided which has the oxygen measuring device and is designed to keep the oxygen content measured by the oxygen measuring device within a predetermined range. In this way, the inert gas content in the gas stream is also indirectly determined.
  • the residual oxygen control device can be coupled to the mass flow controller to control the supply of inert gas.
  • the gas conveying device e.g. the fan
  • the gas conveying device can be provided at the downstream end of the gas discharge device.
  • the curing gap, the gas inlet and the gas outlet can be at least partially sealed from the environment by a non-contact seal.
  • the non-contact seal can, for example, have one or more layered sheet metal or plastic elements.
  • the non-contact seal can also be implemented using a scraper blade.
  • the scraper blade or the associated sheet metal or plastic elements generate a turbulent flow to prevent inert gas from escaping. This enables an almost laminar inert gas flow between the gas inlet and the gas outlet.
  • the turbulent flow in the area of the non-contact seal represents a flow obstacle, so that only a reduced amount of inert gas can escape to the environment there.
  • a curing system for curing a polymer layer on a cylindrical substrate comprising a curing device according to one of the preceding claims; a substrate holder for carrying the cylindrical substrate; a translation device for moving the curing device in a translation direction; a rotation device for moving the substrate carried by the substrate holder in a rotation direction; and a movement control which is designed to control the movement by the To coordinate the translation device with the movement of the rotation device such that the curing device performs a spiral movement relative to the substrate.
  • the curing device can be moved relative to the rotating substrate to cure the polymer.
  • the direction of translation can be in particular the longitudinal direction of the substrate, e.g. its central axis, while the substrate itself is rotated about its main axis or central axis.
  • the desired relative spiral movement can be achieved through the superimposed movement with the rotation of the substrate and the translation of the curing device. This allows the polymer to be cured evenly on the surface of the substrate. In particular, the polymer can be cured seamlessly and effectively due to the spiral path of the UV radiation that is established.
  • a method for curing a polymer layer on a cylindrical substrate comprising the steps:
  • Fig. 1 shows a coating system for applying a polymer layer to a cylindrical substrate
  • Fig. 2 shows a coating device as part of the coating system of Fig. 1, for coating a cylindrical substrate with a polymer;
  • Fig. 3 is a sectional side view of the device of Fig. 2;
  • Fig. 4 is an enlarged detail “C” from Fig. 2;
  • Fig. 5 shows a curing system for curing a polymer layer on a cylindrical substrate;
  • Fig. 6 shows a curing device as part of the curing system of Fig. 5;
  • Fig. 7 is an enlarged detail of the hardening device of Fig. 6;
  • Fig. 8 is a partial sectional side view of the hardening device of Fig. 6.
  • Fig. 1 shows a perspective view of a coating system as part of a layer production system for producing a polymer layer on a cylindrical substrate 1.
  • the substrate 1 is a printing form, namely a gravure cylinder for use in gravure printing.
  • the gravure cylinder is to be coated with a flowable polymer.
  • a flowable polymer This can, for example, be the nanocomposite known from WO 2021/052641 Al.
  • the polymer coating of the gravure cylinder is suitable for creating small depressions, so-called cells, by laser treatment, in particular with a near-field infrared laser (NIR), which can absorb the printing ink and transfer it to the object to be printed.
  • NIR near-field infrared laser
  • the polymer layer must have a relatively small thickness (layer thickness) of e.g. 10 /zm to 500 /zm, in particular 10 /zm to 250 /zm.
  • the substrate 1 or the gravure cylinder is held rotatably in a rotation direction R in a holder (not shown).
  • a coating device 2 is provided on the outside of the substrate 1 and can be moved in a translation direction X along the outside of the substrate 1.
  • the coating device 2 is used to apply the still flowable polymer material to the cylindrical surface of the substrate 1.
  • the coating device 2 When the translational movement of the coating device 2 in the translation direction X and the rotation of the substrate 1 in the rotation direction R are superimposed, the coating device 2 performs a spiral movement relative to the outside of the substrate 1, as shown in Fig. 1 by an arrow S.
  • flowable polymer material with a width of e.g. several millimeters, e.g. 5 mm to 30 mm, can be applied to the outside of the substrate 1.
  • one polymer layer Due to the spiral-shaped relative movement, one polymer layer can be applied next to the other in a spiral or screw shape, so that ultimately the entire surface of the substrate or part of it is uniformly covered with a polymer layer.
  • smoothing elements which will be explained later, a gap that arises between the adjacent polymer layers can be uniformly closed, so that a uniform, homogeneous polymer layer is created.
  • the coating device 2 In order to apply the polymer material, it is necessary for the coating device 2 to maintain a uniform, very close distance from the substrate surface.
  • the coating device 2 can be moved in the radial direction Z of the substrate 1 by a coating positioning device (not shown).
  • the coating positioning device can have a distance control device with a distance measuring device 3.
  • the distance measuring device 3 can work inductively, capacitively or laser-based as a distance sensor and support the distance control.
  • Fig. 2 to 4 show the coating device 2 in detail, wherein Fig. 2 shows a main section, Fig. 3 shows a sectional side view of Fig. 2 and Fig. 4 shows an enlarged detail C of Fig. 2.
  • the coating device 2 has a carrier body 5.
  • a feed nozzle 6 is held in the carrier body 5, to which coating material 7 is fed in the form of flowable polymer material.
  • the coating material 7 can be fed by a continuous, pulsation-free and precise material feed, e.g. with the help of syringe pumps or eccentric screw pumps (dispensers).
  • the feed nozzle 6 has a cylindrical material feed 8 which tapers conically towards an outlet opening 9.
  • the outlet opening 9 can have a depth T of e.g. 1 to 3 mm and a width B of 5 to 30 mm, although other dimensions are also possible.
  • the feed nozzle 6 can taper towards the outlet opening 9 (material outlet) with a taper angle.
  • a taper angle a of e.g. 1 ° to 7 ° ensures a laminar flow and an increasing fluid velocity of the coating material 7 shortly before the material emerges.
  • a smoothing blade 10 is attached to the carrier body 5 in order to smooth the surface of the polymer material applied to the substrate 1.
  • the smoothing blade 10 can be a plastic sheet, for example.
  • the plastic surface of the smoothing blade 10 is well suited to achieving the desired surface quality on the smoothed polymer.
  • a support squeegee 11 is arranged on the back of the smoothing squeegee 10 over the entire back surface of the smoothing squeegee 10.
  • the support squeegee 11 can be made of spring steel. The support squeegee 11 thus supports the shape of the smoothing squeegee 10 and ensures that the smoothing squeegee 10 exerts a sufficiently large pressure on the polymer to be smoothed or spread.
  • Fig. 4 shows the smoothing squeegee 10 and the supporting squeegee 11 in an enlarged view.
  • a return squeegee 12 also made of steel or spring steel, is provided on the front side of the smoothing squeegee 10 and extends over a partial surface of the smoothing squeegee 10 (Fig. 4).
  • the return squeegee 12 can extend over half or a third of the surface of the smoothing squeegee 10.
  • the squeegees 10, 11, 12 are jointly attached laterally to a squeegee attachment 13 on the carrier body 5.
  • a pressure piston 14 is provided on the back of the smoothing squeegee 10, which is actuated and moved by a pneumatic cylinder 15, which in turn is controlled by compressed air via a pneumatic supply 16.
  • the compressed air in the pneumatic cylinder 15 can press the pressure piston 14 downwards against the support squeegee 11 and thus against the smoothing squeegee 10, thus pressing the support squeegee 11 with the smoothing squeegee 10 against the reset squeegee 12.
  • the reset squeegee 12 exerts a counterforce against the effect of the pressure piston 14, so that a balance of forces is established depending on the applied air pressure. This allows the contact pressure of the smoothing blade 10 against the polymer material to be smoothed to be precisely adjusted.
  • the contact pressure of the smoothing blade 10 on the applied polymer layer can be adjusted using a control system. Too much contact pressure leads to a large change in the layer distribution, while too little contact pressure prevents the transition gap between the individual spiral coatings from closing. It has been shown that due to different viscosities, surface tensions and other material variables, a range of surface pressures of the smoothing blade 10 on the polymer material must be feasible.
  • the width of the smoothing blade 10 can be two to three times or up to five times or up to ten times the width of a spiral layer in order to ensure a large contact surface and uniform layer homogenization.
  • Fig. 5 shows a curing system as a further part of the layer production system for producing a polymer layer on a cylindrical substrate.
  • the components shown in Fig. 5 can in particular represent a supplement to the components shown in Fig. 1, so that the entire layer production system combines the components of Figs. 1 and 5, i.e. first the application of a layer of a flowable polymer on the substrate 1 and then the curing of the polymer layer on the substrate 1.
  • the curing system of Fig. 5 assumes that the substrate 1 is already covered with a flowable polymer layer, which now has to be cured in order to become dimensionally stable and to be able to serve its actual purpose, e.g. as a gravure printing roller.
  • the substrate 1, e.g. the gravure roller, is - as in the system of Fig. 1 - still held in the holder, not shown, and rotated in the direction of rotation R.
  • a curing device 20 is arranged on the circumference of the substrate 1, which cures the polymer layer with the aid of UV light.
  • the entire layer production system formed with components of Fig. 1 and 5 can thus comprise the coating device 2 shown in Fig. 1 and the Hardening device 20.
  • This allows a polymer layer to be applied to the outer surface of the substrate 1 by the coating device 2 and then hardened by the hardening device 20 using UV light irradiation.
  • the substrate 1 can be rotated about its main or longitudinal axis, while the coating device 2 on the one hand and the hardening device 2 on the other hand are moved along the outer surface.
  • the curing device 20 has not only a UV light device 21, but also an inert gas supply device 22.
  • the curing device 20 also has a curing translation device (not shown) with which the curing device 20 can be moved in a translation direction X along the longitudinal axis of the substrate 1. In parallel, the substrate rotates in the direction of rotation R, resulting in the spiral movement S. In this way, the curing device 20 can use the UV light device 21 to cover the entire surface of the polymer layer applied to the outer surface of the substrate 1 and thus cure the polymer.
  • the curing device 20 also has a curing positioning device (not shown) with a distance control device in order to be able to adjust the distance of the curing device 20 in the Z direction, i.e. in the direction of the surface of the substrate 1 (radial direction of the substrate 1).
  • a distance measuring device 23 is provided for this purpose. Precise maintenance of the distance is important in order to be able to achieve a satisfactory curing result.
  • Fig. 6 shows the curing device 20 in an enlarged sectional view.
  • the curing device 20 is shown in relation to two substrates 1a, 1b of different sizes in order to illustrate that the curing device 20 can be used for substrates 1 with significantly different diameters.
  • the curing device 20 has the UV light device 21, which is arranged vertically in the example shown and on the underside of which the UV Light can exit through a light opening 21a (Fig. 7), as will be explained later.
  • the inert gas supply device 22 arranged to the right of the UV light device 21 in Fig. 6 has a gas supply line 24 through which inert gas is supplied from a storage device, e.g. a gas bottle or a gas tank. Nitrogen is particularly suitable as an inert gas.
  • the flow of the inert gas to the light opening 21a of the UV light device 21 is regulated by a mass flow controller 25. This will be explained in more detail later.
  • Fig. 7 shows the area below the UV light device 21 in an enlarged view compared to Fig. 6.
  • the light opening 21a which serves as the exit opening of the UV light device 21 and from which the UV light exits in order to irradiate the polymer material, is covered by a UV-transparent quartz glass cover 26.
  • a curing gap 27 is formed between the UV light device 21 or the quartz glass cover 26 on the one hand and the spaced-apart surface of the substrate 1 covered with the polymer layer on the other hand.
  • the inert gas supply device 22 Upstream of the quartz glass cover 26 and the curing gap 27, the inert gas supply device 22 has a flushing nozzle 28, via which the inert gas can be introduced into the curing gap 27 via a gas inlet 29.
  • the flushing nozzle 28 is arranged at the end of a flushing funnel 30, which is followed by a flushing channel 31, as shown in Fig. 8.
  • Fig. 8 shows a section through the flushing channel 31 of Fig. 7. It is clearly visible that the inert gas supplied via a gas line 32 from the mass flow controller 25 is fanned out in the flushing funnel 30 and subsequently calmed in the narrow flushing channel 31.
  • the flushing channel 31 which also serves as a calming section, an essentially laminar flow of the inert gas can be achieved, so that the inert gas can be discharged over the entire width of the flushing nozzle 28 and can cover polymer material on the substrates 1a, 1b before this region of the polymer material, which is then protected by inert gas, reaches the light opening 21a on the quartz glass cover 26 in the curing gap 27, where the UV irradiation takes place.
  • the inert gas After leaving the injection nozzle 28, it is to be expected that the inert gas will partially mix with atmospheric oxygen, since the area of the gas inlet 29 into the curing gap 27 cannot be completely sealed from the environment.
  • the hardening gap 27 is therefore not flowed through by pure inert gas, but by a gas mixture which, in addition to inert gas, will also contain residual oxygen components.
  • the sealing measures provided to reduce the ingress of ambient air and the measures to achieve a predetermined proportion of inert gas in the gas mixture will be explained later.
  • the hardening gap 27 Downstream of the quartz glass cover 26 or the hardening gap 27, i.e. after UV irradiation, the hardening gap 27 ends at a gas outlet 33.
  • a gas discharge device 34 with a measuring chamber 35 arranged downstream is provided there.
  • the gas discharge device 34 can in particular be designed as a gap and create a connecting channel from the end of the hardening gap 27 (gas outlet 33) to the measuring chamber 35. Part of the inert gas is thus discharged via the gas discharge device 34 or to the measuring chamber 35, while another part of the inert gas not captured by the gas discharge device 34 can escape to the environment.
  • the hardening gap 27 is sealed on all sides, i.e. on all four sides, by contactless seals, which are designed in particular in the form of doctor seals 36.
  • the doctor seals 36 have one or more sheet metal elements that are arranged in a staggered manner and represent flow obstacles so that the inert gas cannot flow out unhindered. In this way and in conjunction with a gas conveying device explained later, it can be achieved that only a relatively small part of the inert gas escapes into the environment, while the other part is sucked off via the measuring chamber.
  • a lambda probe (X probe) 37 is provided in the measuring chamber 35 as part of an oxygen measuring device.
  • the oxygen measuring device With the help of the oxygen measuring device, the (residual) oxygen content in the inert gas downstream of the location of the UV irradiation at the light opening 21a can be measured.
  • the inflow amount of inert gas or the ratio of inert gas to oxygen can thus be regulated using the mass flow controller 25 in order to keep the residual oxygen content in a predetermined range on the one hand and thus also the inert gas content in a predetermined range on the other hand in order to ensure effective protection of the polymer surface against oxidation during UV irradiation.
  • the inert gas flow is effected with the aid of a gas conveying device 38, which has an exhaust fan 39.
  • the exhaust fan 39 generates a negative pressure with which the gas mixture is extracted from the inert gas supply device 22 via the hardening gap 27.
  • the gas flow thus takes place via the gas supply line 24, the mass flow regulator 25, the gas line 32, the induction funnel 30, the induction nozzle 28, the hardening gap 27, the gas discharge device 34, the measuring chamber 35 and the exhaust fan 39.

Abstract

L'invention concerne un dispositif de durcissement (20) destiné à durcir une couche polymère sur un substrat cylindrique (1), comprenant un dispositif d'éclairage UV (21) destiné à générer une lumière UV et à fournir la lumière UV au niveau d'une ouverture de lumière (21a) ; une fente de durcissement (27) qui est agencée devant l'ouverture de lumière (21a) ; un dispositif d'alimentation en gaz inerte (22) destiné à fournir un gaz inerte à la fente de durcissement (27) en amont de l'ouverture de lumière (21a) ; un flux de gaz inerte à travers la fente de durcissement (27) ; et un dispositif de mesure d'oxygène (37) destiné à mesurer la teneur en oxygène dans le gaz inerte en aval de l'ouverture de lumière (21a).
PCT/EP2023/070718 2022-10-11 2023-07-26 Dispositif et procédé de durcissement d'une couche polymère sur un corps cylindrique WO2024078764A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022126294.4A DE102022126294A1 (de) 2022-10-11 2022-10-11 Vorrichtung und Verfahren zum Härten einer Polymerschicht auf einem zylindrischen Körper
DE102022126294.4 2022-10-11

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WO2006098478A1 (fr) * 2005-03-18 2006-09-21 Fujifilm Corporation Procede et appareil pour durcir un film recouvert
US20070109333A1 (en) * 2004-01-28 2007-05-17 Francois Coeuret Equipment for ultraviolet crosslinking in a controlled atmosphere
US20110151199A1 (en) * 2009-12-21 2011-06-23 3M Innovative Properties Company Needle coating and in-line curing of a coated workpiece
KR101584710B1 (ko) * 2014-12-09 2016-01-12 (주)세명백트론 질소 분위기를 강화한 ｕｖ 경화장치
WO2021052641A1 (fr) 2019-09-16 2021-03-25 Maschinenfabrik Kaspar Walter Gmbh & Co. Kg Plaque d'impression et son matériau de revêtement polymère
EP4134172A1 (fr) * 2021-08-10 2023-02-15 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Appareil de durcissement par ultraviolets et procédé de durcissement par ultraviolets

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EP1413416B1 (fr) 2002-10-25 2012-05-23 Air Liquide Deutschland GmbH Dispositif de durcissage par rayonnement
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6185840B1 (en) * 1995-05-04 2001-02-13 Noelle Gmbh Method and apparatus for hardening a layer on a substrate
US20020057999A1 (en) * 2000-11-16 2002-05-16 Panayotis Cocolios Installation in which an operation is performed requiring control over the atmosphere inside a chamber
US20070109333A1 (en) * 2004-01-28 2007-05-17 Francois Coeuret Equipment for ultraviolet crosslinking in a controlled atmosphere
US20060204671A1 (en) * 2005-03-10 2006-09-14 Fuji Photo Film Co., Ltd. Method and apparatus for curing coated film and optical film
WO2006098478A1 (fr) * 2005-03-18 2006-09-21 Fujifilm Corporation Procede et appareil pour durcir un film recouvert
US20110151199A1 (en) * 2009-12-21 2011-06-23 3M Innovative Properties Company Needle coating and in-line curing of a coated workpiece
KR101584710B1 (ko) * 2014-12-09 2016-01-12 (주)세명백트론 질소 분위기를 강화한 ｕｖ 경화장치
WO2021052641A1 (fr) 2019-09-16 2021-03-25 Maschinenfabrik Kaspar Walter Gmbh & Co. Kg Plaque d'impression et son matériau de revêtement polymère
EP4134172A1 (fr) * 2021-08-10 2023-02-15 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Appareil de durcissement par ultraviolets et procédé de durcissement par ultraviolets

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