WO2020109617A1 - Procédé et dispositif de carbonisation à sélection de position d'un substrat - Google Patents

Procédé et dispositif de carbonisation à sélection de position d'un substrat Download PDF

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Publication number
WO2020109617A1
WO2020109617A1 PCT/EP2019/083197 EP2019083197W WO2020109617A1 WO 2020109617 A1 WO2020109617 A1 WO 2020109617A1 EP 2019083197 W EP2019083197 W EP 2019083197W WO 2020109617 A1 WO2020109617 A1 WO 2020109617A1
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WIPO (PCT)
Prior art keywords
substrate
laser
irradiation source
previous
during step
Prior art date
Application number
PCT/EP2019/083197
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English (en)
Inventor
Venkatesh SESHAIYA DORAISWAMY CHANDRASEKAR
Original Assignee
Macsa Id, S.A.
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 Macsa Id, S.A. filed Critical Macsa Id, S.A.
Publication of WO2020109617A1 publication Critical patent/WO2020109617A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/44—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements
    • B41J2/442—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements using lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/475—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material for heating selectively by radiation or ultrasonic waves
    • B41J2/4753—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material for heating selectively by radiation or ultrasonic waves using thermosensitive substrates, e.g. paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/267—Marking of plastic artifacts, e.g. with laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/009—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using thermal means, e.g. infrared radiation, heat

Definitions

  • the invention relates to a method for position-selective carbonization of a substrate.
  • the invention also relates to a device for position-selective carbonization of a substrate.
  • Inkless printing devices rely on the thermal process of selective carbonization to print or mark on substrates comprising cellulose such as paper and cardboard without the need of ink.
  • This selective carbonization i.e. the inkless printing, can be applied to regular substrates omitting the need of special coatings, special heat sensitive paper or special wavelength-sensitive paper.
  • Another benefit is that there is no need for the use of consumables such as toners which is beneficial from environmentally point of view. This also applies to the omission of ink.
  • the contrast between the print and the substrate is sufficient.
  • An adequate contrast is in particular relevant when printing text, numbers and/or barcodes.
  • Laser-based inkless devices can already achieve a desired, and therefore optimal, contrast, however, therefore the printing needs to be performed at relatively low scan speeds.
  • the print is made on a white background such as white paper or white cardboards, since further types of non white substrates, such as brown cardboards, may result in a decreased contrast between the substrate and the print, resulting in a lower quality of the print.
  • Applying a relatively low scan speed, compared to conventional printers, is also required for optimising the blackness of the print.
  • the print When operating at low scan speed the print can achieve the lowest lightness value, which corresponds to an optimum blackness.
  • the low scan speed results in a relatively long printing time.
  • a further drawback of the state of the art is that the print depth of the print with respect to the substrate for a fixed power density of the laser increases with time. Hence, when operating at low scan speed the print will be deeper into the material, and by defect decreasing the strength of the substrate material and increasing the probability of burning through the material leading till hole formation.
  • the invention provides thereto a method for position-selective carbonization of a substrate, comprising the steps of:
  • step b) post-irradiation of at least one printed marking generated during step b) by using at least one secondary irradiation source, in particular a laser, such that the marking is darkened.
  • the method according to the invention focusses on post-irradiation of one or more position-selectively irradiated parts of a carbonizable substrate.
  • the position-selectively irradiation of the substrate causes the substrate temperature to rise and to exceed the (minimum) carbonization temperature of the substrate, as a result of which the irradiated part(s) is/are carbonized. In this manner one or more markings can be printed.
  • This carbonization process is also referred to as inkless printing.
  • a limitation of the current inkless printing techniques is that the carbonization step causes a physical limitation to the overall process.
  • a factor significantly limiting the process is the printing speed which can be achieved by using the primary irradiation source. Use of multiple laser beams is possible, but this still takes a considerable amount of time in order to achieve a desired blackness level of the marking(s), and often too much time from an economic and commercial point of view.
  • each irradiated (carbonized) substrate part is irradiated at least twice to obtain one or more markings having sufficient blackness, and without requiring a significant amount of time, as a result of which the printing speed of the printing process as such can be increased significantly.
  • This allows a reduced contact time between the beam emitted by the irradiation source(s), which results in a limited carbonization depth.
  • a limited carbonization depth leading to superficial marking(s) is typically advantageous, since serious damage of the substrate can be prevented this way.
  • the invention enables that only a slight modification, in particular a slight optical observable modification, of the substrate is required during step b) since completion of the full thermal process of carbonization can be effectuated during step c).
  • Step b) thereby at least initiates the carbonization, while during step c) the carbonization is continued resulting in a relatively dark (black) print.
  • Step c) is generally not a time- limiting factor for the printing since irradiation of step c) as a high position-selectivity as used during the inkless printing of step b) is not required. Additionally, it is possible that the area to be post-irradiated covers a larger area than merely the position-selectively irradiated parts. It is even conceivable that substantially the entire substrate is exposed to post-irradiation under step c). By applying the post irradiation of step c) a significant increase of the blackness of the irradiated part (i.e.
  • step c) the printing speed of step b) can be significantly increased which is favourable from an economic and commercial point of view.
  • a satisfying blackness level is often defined by the lightness level L * as defined in a CIELAB colour space, which is, in this particular context, preferably equal to or below 30. Due to step c) providing for sufficient blackness of the desired print it possible that the diameter of at least one beam of the primary irradiation source, in particular a laser, is proportional to the resolution of the desired print. This will result in at least one marking on/in substrate which preferably substantially equals the beam used for the irradiation.
  • the carbonization initiated during step b) and completed during step c) of the method according to the invention is typically based upon pyrolysis, and hence is also referred to as pyrolytic carbonization.
  • pyrolytic carbonization The advantages of pyrolytic carbonization is that carbon can be produced in a relatively simple and cost- efficient manner, without needing complicated facilities.
  • cyclization and aromatization proceed in the carbonizable substrate, typically formed by an organic precursor, with the release of various organic compounds like hydrocarbons, and inorganic matters such as CO, C0 2 , H 2 0, mainly because some of the C-C bonds are weaker than C-H bonds.
  • out-gassing is typically hydrogen (H 2 ) due to the polycondensation of aromatics.
  • H 2 the residues which have “suffered” from carbonization
  • the residues which have “suffered” from carbonization may be called carbonaceous solids though they might still contain hydrogen.
  • graphitization begins so the residues contain more than 99% of C which are thus called carbon materials.
  • the occurrence of reactions, including cyclization, aromatization, polycondensation and graphitization depends strongly on the substrate used as well as heating conditions. Sometimes these processes overlap with each other throughout pyrolysis and therefore, the whole process from precursor to the final carbon residues is often simply called“the carbonization”. In the method according to the invention at least cyclization and aromatization take place.
  • the flame retardants could facility and stabilize the pyrolysis process of the carbonizable substrate.
  • the preferred presence of dihydrogen phosphate (GDP), ammonium phosphate (DAP), and diguanidine hydrogen phosphate (DHP) in and/or on the substrate leads to an increase of 33% on carbon yield.
  • water-soluble organosilicon whether alone or mixed with other ammonium additives, also helps increasing carbon yield to an important extent and improving simultaneously mechanical resistivity of carbon particles and carbon fibres.
  • step b) may also be applied in air (atmospheric conditions) or in an inert atmosphere.
  • Carbonizable substrates refer to substrates, in particular sheets or layers, which can get carbonised at elevated temperature, typically temperatures of 270 degrees Celsius and higher, more specifically temperatures of 400 degrees Celsius and higher.
  • Examples of carbonizable substrates are cellulose based materials like paper, brown carton, wood, etcetera. Also the use of coloured substrates is possible when applying the method according to the invention. It is also conceivable that the substrate is formed by a carbonizable polymer, like polyimide or polyamide.
  • the temperature during this irradiation should exceed at least 270 degrees Celsius, preferably at least 400 degrees Celsius. Therefore, preferably is during step b) the temperature of the at least one irradiated part of substrate brought to at least 270 degrees Celsius, preferably at least 400 degrees Celsius.
  • the secondary irradiation source, in particular a laser is for example an illumination source, emitting visible light.
  • this term is interchangeable for the term post-illumination.
  • the secondary irradiation source, in particular a laser emits at least one beam having a wavelength in the range of 380 to 750 nanometre, in particular 420 to 590 nanometre, more particular 450 to 570 nanometre.
  • the secondary irradiation source in particular a laser, is therefore configured to generate electromagnetic radiation with a wavelength within said ranges. It is beneficial if said secondary irradiation source is configured to emit at least one beam having a wavelength in the range of 450 to 490 nanometres. This embodiment will emit blue light. It is also beneficial if said secondary illumination source is configured to emit at least one beam having a wavelength in the range of 490 to 560 nanometres. This embodiment will emit green light. Since the absorbance level of the position-selective irradiated parts is higher than the absorbance level of the parts of the substrate which were not irradiated this absorbance difference can be used for selecting a secondary irradiation source for completing the carbonization.
  • Electromagnetic radiation having a wavelength in the range of 380 to 750 nanometre, in particular 420 to 590 nanometre, more particular 450 to 570 nanometre is found out to be usable for this selective absorption.
  • the secondary irradiation source in particular a laser
  • emits at least one beam having a wavelength in the range of 380 to 750 nanometre, in particular 420 to 590 nanometre, more particular 450 to 570 nanometre substrate reflects the irradiation and the irradiation is absorbed by the during step b) obtained marking such that the carbonization will be completed.
  • a benefit thereof is that the substrate can be substantially entirely irradiated during step c) without negatively influencing the quality of the print and/or substrate.
  • the secondary irradiation source is for example a laser selected from the group consisting of: a blue laser, a green laser, a blue-green laser.
  • the secondary irradiation source in particular a laser, comprises at least one stationary beam, sweep beam and/or a collinear beam.
  • the desired type of beam(s) to be used is merely dependent on the area which needs to be exposed to post-irradiation.
  • At least one beam of the secondary irradiation source in particular a laser, at least partially overlaps with at least one beam of the primary irradiation source, in particular a laser. This will result in a further decrease in the required total printing time.
  • steps b) and c) successive steps are steps b) and c) successive steps. It is however also possible that step b) and step c) are substantially simultaneously performed. It is however also possible that step b) and step c) partially overlap in time. Furthermore, it is imaginable that step b) and step c) partially overlap in time.
  • the secondary irradiation source may even form integral part of and/or may be formed by the primary irradiation source, further enabling this embodiment.
  • the time interval between step b) and step c) is preferably chosen such that at least an optical modification of the substrate has occurred.
  • the time interval between step b) and step c) is preferably at most 2 seconds, preferably at most 1 second.
  • a part of the substrate is position-selectively irradiated for a period of time situated in between (and including) 0 and 2 seconds, preferably between (and including) 0 and 1 seconds, more preferably between (and including) 0 and 0.5 seconds.
  • this time interval will be sufficient to convert at least part of the substrate position- selectively irradiated into char (carbon particles/fibres) or at least initiated an activation of the carbonization.
  • a slight modification, in particular a slight optical observable modification, of the substrate is required during step b) since completion of the full thermal process of carbonization can be effectuated during step c).
  • a part of the substrate is position-selectively irradiated for a period of time situated in between 0 and 5 seconds, preferably between 0 and 2.5 seconds, more preferably between 0 and 1 seconds.
  • At least one primary irradiation source is a laser, and preferably a diode laser and/or C0 laser.
  • Carbon dioxide lasers are the highest-power continuous wave lasers that are currently available. And they are also quite efficient: the ratio of output power to pump power can be as large as 20%.
  • the C0 laser typically produces a beam of infrared light with the principal wavelength bands centering on 9.4 and 10.6 micrometres (pm). Lasers typically operate relatively fast and, moreover, are flexible, as a result of which lasers are ideally suitable to create different track, pads, or electronic circuits, or parts thereof, within a short time frame.
  • the substrate is irradiated position-selectively in another manner, for example by using a heated stamp to physically burn, position-selectively, the substrate.
  • a mask may be applied onto the substrate after which the uncovered parts of the substrate are heated, for example by means of a heated air flow, to temperature above the carbonization temperature. Stamps and masks are typically useful in case a standard track layout and/or pad layout would be desired.
  • the substrate and the at least one irradiation source are mutually displaced by using a speed which is at least 100 mm/s, preferably at least 1000 mm/s, more preferably 2500 mm/s, even more preferably at least 5000 mm/s, in particular preferably at least 6000 mm/s.
  • This speed is also called the printing speed, the marking speed, or the carbonization speed.
  • Figure 2 shows that it is experimentally found that these printing speeds are feasible when applying the method according to the invention without encountering limitations in the darkness and/or contrast of the print.
  • the substrate is substantially entirely irradiated by at least one secondary irradiation source during step c).
  • the total area of a substrate exposed to post irradiation during step c) at least equals the total area of said substrate which is position-selectively carbonized during step b). It is also conceivable that the total area of a substrate post-irradiation during step c) is larger the total area of said substrate which is position-selectively carbonized during step b). It is also possible that the total area of a substrate post-irradiation during step c) is equal to or smaller than the total area of said substrate which is position-selectively carbonized during step b).
  • step d comprising of preheating the substrate, preferably to a temperature situated in between 200 and 250 degrees Celsius, prior to performing step b).
  • preheating the substrate prior to executing step b) could improve the char yield, and hence the conductivity.
  • This preheating could be realized, for example, by means of an oven, an infrared heating source, and/or by the same irradiation source as used during step b).
  • the to be preheated part of the substrate will typically be exposed to a reduced power density to prevent premature carbonization of the substrate. This may, for example, by achieved by so- called beam-shaping, wherein the irradiating beam of the irradiation source is broadened to reduce the power density of said beam.
  • An embodiment of the method according to the invention is possible, wherein at least part of the substrate is subjected to at least one photochemical bleaching step, preferably prior to step b).
  • at least part of the substrate will be whitened.
  • bleached or whitened it is meant that the lightness value (L * ), as defined in the CIELAB colour space, is increased.
  • An increased lightness value of a substrate corresponds to a lighter colour of the substrate.
  • the photochemical bleaching step is preferably applied before selective carbonization of the substrate.
  • Applying at least one photochemical bleaching step is in particular useful when using an non-white substrate, such as but not limited to, brown cardboard.
  • This embodiment is for example in particular beneficial when printing a (matrix) bar code or QR code, since these codes require a sufficient contrast between the print and the substrate.
  • the photochemical bleaching is performed by irradiation of at least part of the substrate with an irradiation source using a power density in a range of 20k W/cm2 to 140 kW/cm2 and applying a irradiation time of at most 55 microseconds.
  • the irradiation source can be either the primary irradiation source used for the carbonization of the substrate or a further secondary irradiation source.
  • the irradiation of at least part of the substrate with an irradiation source preferably a laser, with a power density in the range of 20k W/cm2 to 140 kW/cm2, preferably 30k W/cm2 to 120 kW/cm2, and an irradiation of 55 microseconds or below results in a thermal shock of the substrate.
  • the thermal shock provides the photochemical bleaching effect.
  • at least part of the water content of the treated area will be evaporated. At least part of the evaporated water may optionally be removed via an extractor.
  • the photochemical bleaching step is generally performed as an additional step, however, it is also possible that the chemical bleaching step replaces step b) of the method according to the invention.
  • the method according to the invention preferably comprises step e), comprising the step of increasing the bond strength between at least one marking printed and/or to be printed during step b) and the substrate. This will lead to an improved fixation of the printed marking(s) onto the substrate.
  • step e) can be performed prior and/or after step b), and wherein step e) can be performed prior and/or after step c).
  • step e) is preferably based upon treating the substrate with a bond strength improving coating, which can, for example, by spraying, preferably by using one or more spray nozzles, onto the substrate prior to step b).
  • This bond strength improving coating may also be applied after carbonization according to step b).
  • the coating may be configured to react with the marking(s) to intensify the bond between the marking and at least one of the substrate and the coating.
  • step e) comprises the step of further irradiating the at least one marking, such that the bond strength between said at least one marking and the substrate is improved (intensified).
  • step e) comprises the step of apply mechanical pressure onto the at least one marking formed during step c), which may also lead to an increase of the bond strength of said at least one marking onto the substrate. Applying a pressure may, for example, be realized by using a roller.
  • the invention furthermore relates to a printing device for selective carbonization of a substrate, preferably by using a method according to the present invention, at least one primary irradiation source, in particular a laser, such as a C02 laser, being configured to position-selectively carbonize at least one part of the substrate by position-selectively irradiating of said at least one part of the substrate to form at least one printed marking and at least one secondary irradiation source, in particular a laser, being configured to post-irradiate of at least one printed marking generated by means of the primary irradiation source, such that the marking is darkened.
  • a primary irradiation source in particular a laser, being configured to position-selectively carbonize at least one part of the substrate by position-selectively irradiating of said at least one part of the substrate to form at least one printed marking
  • at least one secondary irradiation source in particular a laser, being configured to post-irradiate of at least one printed marking
  • the device preferably comprises at least one control unit for controlling at least one primary irradiation source and/or at least one secondary irradiation source.
  • control unit is configured to control the printing device as such.
  • the control unit is preferably programmed to execute at least step b) and step c) of the method according to the invention.
  • figure 1 a shows a schematic representation of a print obtainable via selective carbonization of a substrate
  • FIGS. 1 b-1 e show examples of the parts to be exposed to post-irradiation
  • figure 2 shows the effect in lightness of the inkless print as a function of the marking speed of the laser when applying the method according to the invention.
  • FIG. 3a and 3b show possible embodiments of a printing device according to the invention.
  • Figure 1 a shows a schematic representation of an example of a print (1 ) obtainable via position-selective carbonization of a substrate (2) via the method according to the present invention.
  • the figure shows the carbonized area (1 ) or print (1 ) in order to be able to indicate the area(s) of the substrate which will be exposed to post-irradiation under step c) after completion of step b) of the method according to the invention. Examples of the areas exposed to post-irradiation are illustrated in figures 1 b-1 e.
  • Figure 1 b shows the substrate (2) as shown in figure 1 a, wherein an area (3b) to be exposed to post irradiation is indicated via highlighting (3b).
  • the determination of the area (3b) is based upon the surface enclosed by the print (1 ) which is to be position-selectively carbonized (printed).
  • the area (3) to be post-irradiated encloses the print (1 ) entirely.
  • Figure 1 c shows a further example how the area (3c) of the substrate (2) to be exposed to post irradiation can be defined.
  • the predefined area (3c) substantially follows the contours of the final print (1 ).
  • a benefit of this example is that a smaller area (3c) has to be exposed to post-irradiation compared to the example of figure 1 b, resulting in a reduced energy requirement for applying this step.
  • Figure 1 d shows a third example of defining the area (3d) of the substrate (2) which has to be exposed to post-irradiation post to the selective carbonization (1 ) according to the method according to the invention.
  • the figures shows that multiple areas (3d) are indicated, wherein each area (3d) substantially follows the contours of the print (1 ).
  • the total area of a substrate (2) which is to be exposed to post-irradiation substantially at least equals the total area of said substrate (2) which is position- selectively carbonized (1 ).
  • Figure 1 e shows a fourth example falling within the scope of the invention of defining the area (3e) of the substrate (2) which has to be exposed to post-irradiation after to the position-selective carbonization (1 ).
  • the predefined area (3e) to be exposed to post-irradiation is further reduced compared to the previous examples.
  • the figure shows that the predefined areas (3e) are substantially localized with respect to the print (1 ).
  • the total area of a substrate (2) which is to be exposed to post-irradiation substantially equals the total area of said substrate (2) which is position-selectively carbonized (1 ).
  • Figure 2 shows the effect in lightness of the inkless print as a function of the marking speed of the laser when applying the method according to the invention.
  • the y-axis of the graph shows the lightness level
  • (L * ) of the print The L * values are measured by using a calorimeter.
  • a lightness level below 30 corresponds to an acceptable blackness, and therewith acceptable contrast, of the print.
  • the x-axis shows the marking speed of the laser (in mm/s).
  • a minimum laser marking speeds of 5000 mm/s is desired in order to be compatible in the printing market.
  • the figure indicates a series of measurement points for printing where only step b) is applied and a series of measurement points where both step b) and step c) are applied.
  • the effect of step c) in the lightness level, and therewith the darkness of the print, can be clearly observed in the graph. Even for relatively high printing speeds, exceeding 5000 mm/s the desired darkness can be obtained.
  • Figures 3a and 3b show possible embodiments of a printing device (4) according to the invention.
  • the device (4) is configured for selective carbonization of a substrate (2).
  • the device comprises a primary irradiation source (5), in particular a laser, for at least partially irradiating the substrate (2) such that carbonization of at least part of the substrate (2) occurs and a secondary irradiation source (6), in particular a laser, for post-irradiation of said substrate (2).
  • a primary irradiation source (5) in particular a laser
  • a secondary irradiation source (6) in particular a laser
  • the device (4) furthermore comprises a heating source (7) for at least partially heating the substrate (7) and a control unit (8) for controlling the irradiation source(s).
  • the device (4) comprises a colour sensor, an extractor for removing volatile compounds and/or a non- contact temperature sensor (not shown).
  • the substrate (2) is in the shown embodiment positioned on a moving stage (9).

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Abstract

L'invention concerne un procédé de carbonisation à sélection de position d'un substrat, au moins une zone prédéfinie dudit substrat étant chauffée avant la carbonisation sélective. L'invention concerne également un dispositif conçu pour mettre en œuvre le procédé.
PCT/EP2019/083197 2018-11-30 2019-11-29 Procédé et dispositif de carbonisation à sélection de position d'un substrat WO2020109617A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114369475A (zh) * 2021-11-29 2022-04-19 清华大学 制备碳化中间相沥青的方法

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Publication number Priority date Publication date Assignee Title
GB2421221A (en) * 2004-12-20 2006-06-21 Uponor Innovation Ab Laser marking of plastic pipe
WO2018009070A1 (fr) * 2016-07-08 2018-01-11 Tocano Holding B.V. Appareil d'impression
WO2018102633A1 (fr) * 2016-12-02 2018-06-07 Videojet Technologies Inc. Système et procédé de marquage laser de substrats

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2421221A (en) * 2004-12-20 2006-06-21 Uponor Innovation Ab Laser marking of plastic pipe
WO2018009070A1 (fr) * 2016-07-08 2018-01-11 Tocano Holding B.V. Appareil d'impression
WO2018102633A1 (fr) * 2016-12-02 2018-06-07 Videojet Technologies Inc. Système et procédé de marquage laser de substrats

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114369475A (zh) * 2021-11-29 2022-04-19 清华大学 制备碳化中间相沥青的方法
CN114369475B (zh) * 2021-11-29 2023-02-03 清华大学 制备碳化中间相沥青的方法

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