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
  • B41M7/009—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
• • 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

Definitions

• the invention relates to a method for labeling plastic surfaces, especially with compositions based on plastics.
• the light source is a laser, preferably a laser with a variable wavelength.
• a laser preferably a laser with a variable wavelength.
• the Energy can be worked because otherwise the plastic components will decompose is to be feared. This is preferably done during the labeling process not classic driven over the place to be labeled, but several Times. if necessary by moving the light source back and forth and / or the irradiating surface.
• the primary goal of the above method is local composition fixate by radiation. This requires at least part of the composition and / or a part or all of the plastic surface is melted be, whereby then a firm connection between the locally fixed Composition and the plastic surface forms.
• the at least one coloring component comprises Composition preferably at least one plastic component.
• This consists preferably of fine plastic particles.
• the plastic component can be freely selected from all meltable plastics that are in become completely or partially molten, and possess film-forming properties. These plastics are used depending on a label to be provided surface freely under thermoplastics and Thermosets chosen.
• Polyether and Polyester urethanes Polyvinyl chloride, alkyd resins, phenolic resins, polyolefins, in particular polyethylene homopolymers and copolymers, epoxy resins, polyesters, Polystyrenes, styrene-acrylonitrile copolymers, polybutylene terephthalates, polyamides and acrylic resins.
• the known powder coating or powder slurry systems can also be used very well. made of suitable plastics and pigments in particle form, if necessary. exist together with a solvent.
• compositions that is only used as coloring component an organic or inorganic pigment and a suitable solvent, e.g. THF, aliphatic or aromatic Hydrocarbons, e.g. Hexane, cyclohexane, toluene, etc.
• a suitable solvent e.g. THF, aliphatic or aromatic Hydrocarbons, e.g. Hexane, cyclohexane, toluene, etc.
• the at least one coloring component of the composition is preferably temperature-resistant.
• temperature-resistant is understood to mean that its melting point is higher than the temperatures to which it is or may be exposed when the process according to the invention is carried out. Both inorganic and organic, temperature-resistant pigments can be used as the coloring component.
• naturally occurring inorganic pigments such as chalk, ocher, umber, green earth, graphite
• synthetic inorganic pigments such as white pigments, for example titanium dioxide, lead white, zinc white, lithopone, antimony white
• Black pigments for example carbon blacks, iron oxide black, manganese black and cobalt black
• Colored pigments for example lead chromate, red lead, zinc yellow, zinc green, cadmium red, cobalt blue, Berlin blue, ultramarine, manganese violet, cadmium yellow, Schweinfurt green, molybdenum red and orange, chrome orange and red, iron oxide red, chrome oxide green, strontium yellow
• gloss pigments such as zinc or lead powder and pearlescent pigments
• naturally occurring organic pigments such as, for example, sepia brown, gummy good, bone charcoal, Kasseler brown, indigo, chlorophyll
• synthetic organic pigments such as azo dyes, indigoids, phthalocyanines, those of the
• So-called composite pigments can also be used, for example SiO 2 particles with a colored layer coating.
• Further well-usable pigments and details on pigments in general are in Ullmann "Encyclopedia of Technical Chemistry", 4th edition, Vol. 18, VCH-Verlag, Weinheim and Römpp's Chemistry Lexicon, CD version 1.5, Georg Thieme Verlag 1998 each under the keyword “ Pigments "to find, the relevant content of which is incorporated by reference in the context of the present application.
• the at least one coloring component is preferably uniform in color dispersed at least one plastic component, the latter in turn undyed or self-colored.
• the plastic component or the individual fine Plastic particles are color-bearing, i.e. firmly with the ink-bearing component be connected.
• the plastic component is even is pigmented, as is the case with powder coatings, the Plastic component then more suitable in the form of uniformly pigmented particles Size can be brought.
• the pigmented ones Plastic particles have an average diameter in a range of about 0.7 ⁇ m to about 15 ⁇ m, particularly preferably from about 3 ⁇ m to about 10 ⁇ m.
• At powder coatings of this type are generally heat-curing and / or UV-curing Powder.
• thermosets e.g. Epoxy
• Polyacrylates, polyamides, Ethylene-vinyl acetate copolymers, polyethylene homo- and copolymers, PVC, Polyester and polyepoxides are used.
• the Plastic component still a suitable crosslinker. More information about the polymers and / or crosslinkers that can be used for powder coating are those above cited "Ullmann”, vol. 15, keyword “Lacke”, sub-item “Powder coatings” can be found, the relevant content of which can be found in full Reference is made in the context of the present application.
• the pigmented plastic particles in powder form are then on the labeling plastic surface applied.
• irradiation with light then preferably with laser light of a suitable wavelength, a fixed wavelength is obtained Connection of the applied powder with the surface to be labeled.
• composition having at least one color-bearing component a mixture that is undyed plastic particles and homogeneous or composite color particles.
• the at least one color-bearing component Composition should be a mixture of undyed plastic particles and composite color particles in which primary pigment particles are dispersed, includes.
• the color particles are preferably colored by soluble dyes.
• the diameter of the color particles is preferably in a range of approximately 0.7 ⁇ m up to about 15 ⁇ m, particularly preferably in a range from about 3 ⁇ m to about 10 ⁇ m, more preferably around 10 ⁇ m.
• the average diameter of the undyed plastic particles is preferably in a range of about 0.1 ⁇ m to about 15 ⁇ m, particularly preferably about 3 ⁇ m.
• These aforementioned mixtures are preferably also in powder form applied the plastic surface to be labeled and there with suitable light irradiated.
• the composition having at least one color-bearing component in the form of a suspension i.e. in the manner of a varnish, on the one to be labeled Plastic surface applied.
• a suspension i.e. in the manner of a varnish
• To apply the suspension to the different techniques can be used, preferably spraying and / or printing and / or doctoring and / or Pour on and / or by immersing the surface to be labeled in the Suspension.
• the plastic particles used are preferably shredded, particularly preferably produced by wet comminution.
• the plastic particles are produced by melt emulsification. It acts it is a procedure in which the plastic is first melted is then brought into contact with a fluid with which it is not is miscible, e.g. Water, droplets of plastic in the Micrometer range arise. Finally, the mixture obtained is cooled, being a very fine-grained suspension with regular spherical Plastic particles are created.
• a fluid with which it is not is miscible e.g. Water
• the plastic particles are furthermore preferred by polymerization manufactured.
• the at least one color-bearing component Composition also a crosslinking agent that can be activated thermally and / or UV is.
• crosslinking agents do not make the plastic component only melted by the radiation and in this way with the corresponding plastic surface, but also with this networks, which significantly improves the quality of the coating.
• crosslinkers are also suitable crosslinkers used, e.g. Polyisocyanates, isocyanurates, bisoxazolines, Dicarboxylic acids and anhydrides, epoxies, imidazolines and bisphenols.
• an uncrosslinked polymer e.g. a duromer than Particle or film is created on the plastic surface and then the Crosslinking reaction triggered, e.g. thermal, e.g. by increasing the temperature 100 to 200 ° C, but not up to the melting temperature of the polymer, or by UV or electron beam radiation.
• the polymer itself can also be a group capable of networking. e.g. have a benzophenone group.
• the polymer is first applied to the particle coating or film Plastic surface applied and the crosslinking reaction triggered.
• crosslinking can be caused that initially a (thin) liquid state arises, in which from the disperse particle layer, a closed film emerges, and only then Curing (crosslinking) occurs.
• the present invention relates to the use of the invention Process or the corresponding at least one according to the invention Color-bearing component having a composition for labeling Plastic surfaces and this composition itself.

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• Physics & Mathematics (AREA)
• Health & Medical Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Toxicology (AREA)
• Thermal Sciences (AREA)
• Electromagnetism (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Pens And Brushes (AREA)
• Ink Jet (AREA)
• Heat Sensitive Colour Forming Recording (AREA)

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Citations (10)

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• 1999
  • 1999-11-11 DE DE19954366A patent/DE19954366A1/de not_active Withdrawn
• 2000
  • 2000-11-08 US US09/708,026 patent/US6592949B1/en not_active Expired - Fee Related
  • 2000-11-10 EP EP00124254A patent/EP1099565B1/fr not_active Expired - Lifetime
  • 2000-11-10 DE DE50007606T patent/DE50007606D1/de not_active Expired - Fee Related

Patent Citations (10)

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