Classifications

• • 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
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
  • D21H21/22—Agents rendering paper porous, absorbent or bulky
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
  • D21H21/52—Additives of definite length or shape
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/33—Synthetic macromolecular compounds
  • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/53—Polyethers; Polyesters
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/33—Synthetic macromolecular compounds
  • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
  • D21H17/56—Polyamines; Polyimines; Polyester-imides
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H19/00—Coated paper; Coating material
  • D21H19/36—Coatings with pigments
  • D21H19/38—Coatings with pigments characterised by the pigments
  • D21H19/42—Coatings with pigments characterised by the pigments at least partly organic
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H19/00—Coated paper; Coating material
  • D21H19/36—Coatings with pigments
  • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
  • D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
  • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
  • Y10T428/254—Polymeric or resinous material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31786—Of polyester [e.g., alkyd, etc.]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31855—Of addition polymer from unsaturated monomers

Definitions

• the present invention relates to laser-markable papers and cardboards, which are characterized in that they act as absorbents and Carbon-forming micro-ground plastics consisting of linear aromatic polyesters and / or linear polyarylenes with a Particle size of 0.1-100 microns included.
• the invention therefore relates to laser-markable papers and Cardboard boxes, characterized in that they are used as absorbents and Carbon-forming micro-ground plastics consisting of linear aromatic polyesters and / or linear polyarylenes with a Particle size of 0.1-100 microns included.
• micro-ground plastics By adding the micro-ground plastics in concentrations from 0.1 to 10% by weight, based on the pulp, preferably 1 to 5% by weight, and in particular 1 to 2% by weight, is used for laser marking a high contrast is achieved.
• concentration of the absorber in the Paper pulp depends on the type of paper pulp, however Paper thickness and the energy density of the laser used. The relative small amount of absorbent changes the paper product insignificant and does not affect its processability.
• the edge sharpness of the marking is particularly affected by the Particle size of the micro-ground plastics determined.
• the plastics Preferably have particle sizes in the range of 0.1-50 ⁇ m, in particular from 0.1-15 ⁇ m.
• Suitable absorbents are especially from the group of linear aromatic polyesters Polycarbonates (PC), polyalkylene terephthalates (PTP), the poly (ether) esters and polyarylates. From the group of linear polyarylenes are Polyphenylene ether (PPO, PPE), polyaryl ether ketone (PEK, PEEK), Polyanilines, polyphenylene sulfides (PPS), polysulfones (PSU, PES, PPSU) to be mentioned as particularly preferred.
• a combination can also be used as the absorbent and carbon former from a mixture of different micro-ground plastics in all conceivable mixing ratios are used.
• High-energy radiation is preferably used in the marking, generally in the wavelength range from 150 nm to 1500 nm, preferably in the range from 150 to 1100 nm.
• CO 2 lasers (10,600 nm)
• Nd: YAG lasers (1067 or 532 nm)
• pulsed UV lasers excimer lasers
• Nd YAG lasers (1064 or 532 nm) and CO 2 lasers (10600 nm) are particularly preferably used.
• the energy densities of the lasers used are generally in the range from 0.3 mJ / cm 2 to 50 J / cm 2 , preferably 0.5 mJ / cm 2 to 20 J / cm 2 and particularly preferably 0.3 mJ / cm 2 to 10 J / cm 2 .
• the pulse frequency is in the generally in the range from 0.1 to 10,000 Hz, preferably from 0.5 to 5000 Hz and in particular from 1 to 1000 Hz, and the pulse lengths (Duration of the individual pulses) in the range from 0.1 to 1000 ns, preferably from 0.1 to 500 ns and particularly preferably from 1 to 100 ns.
• the pulse lengths and the type of paper product irradiated are sufficient to achieve good labels generally 1 to 20,000, preferably 1 to 5000, and in particular 1 to 3000 pulses.
• all papers and cardboard boxes can be labeled with sharp edges and high contrast using a laser.
• the laser inscription takes place in such a way that the sample body is brought into the beam path of a laser, preferably a CO 2 or Nd: YAG laser. Labeling with an excimer laser is also possible.
• the desired results can also be achieved with other conventional laser types which have a wavelength in the range of high absorption of the absorber used.
• the hue obtained and the depth of color are determined by the laser parameters such as the irradiation time and the irradiation power.
• the power of the lasers used depends on the respective application and can be easily determined by a specialist in individual cases.
• Papers and cardboard especially for the packaging sector, usually consist of 70 - 100% natural and synthetic Fibers with 20 - 30% fillers and sizing agents the middle Form paper layer.
• a coating consisting of pigments for white coloring, binders and additives, on the base paper there is a closed, smooth surface achieved for the subsequent printing and further processing.
• the coated papers are matt or glossy satin, one-sided or coated on both sides.
• the absorbent can be used in the manufacture of the pulp at every step of the process before loading on the paper machine are stirred in, and used in the coating.
• Paper usually consists of wood pulp and / or cellulose and possibly synthetic fibers and the so-called paper auxiliaries, such as. Fillers, binders for sizing, retention aids, optical brighteners, dyes. Incorporation of the absorber in the pulp can be done in different ways. So it can Absorbent with the pulp or wood pulp in dry form be mixed. Alternatively, the absorber can be made from the fibrous pulp Pulp or wood pulp are mixed. A homogeneous distribution of the Absorber material is also achieved if you use the absorbent adds the individual components of the paper aid.
• the addition of the absorber material to the is particularly preferred Binder needed for sizing the paper.
• the addition of the absorber material can also take place if the Mixing of pulp and paper auxiliaries takes place. The finished one Paper pulp then goes to the paper machine.
• the raw paper with the absorber is usually one or more times one or painted on both sides. This can also be done in the coating agent Absorbent are stirred. Here, however, the Total proportion of the absorbent in the base paper and in the deletion the upper limit of 10% by weight based on the pulp does not exceed, otherwise no sharp-edged marking is guaranteed. Incorporation of the absorbent into the paper or cardboard can also be done in such a way that the base paper without Absorbent coated with a coating slip with absorbent becomes. In this case, the absorber is only in the coating agent and not in the actual paper pulp.
• the fibrous materials are especially the modified wood materials, such as TMP wood material (Thermo-Mechanical-Pulp) or CTMP wood pulp (Chemo-Thermo-Mechanical-Pulp) or their mixtures used.
• the recovered one Pulp from the waste paper can be used.
• the marking result is positively influenced if the named Fibers proportionally added to chemical fibers, in particular Cellulose derivatives, ethers, acetate, viscose and carbon fibers, polyethylene and polypropylene, polyvinyl alcohol, acrylonitrile (co) polymers and Polyamides, e.g. temperature-resistant aramid fibers. Through such Additions are the edge sharpness and the color depth when marking positively influenced.
• the fibrous feedstocks fillers such.
• binders such as. Starch, casein, proteins, plastic dispersions, Resin glues, etc. for strengthening the fiber structure, binding of Fillers and pigments, increase water resistance, improvement the writeability and printability.
• the choice of a suitable organic binder can do that Influence the marking result positively. Particularly good marking results are obtained when the binder with the Absorber material mixes and the pulp or wood pulp in solid or mixed in liquid form.
• Suitable binders are especially solvent-free glues that also in paper coating, coating and impregnation Find application.
• Preferred binders are cationic resin sizes, Rosin, modified rosin esters, synthetic alkyldiketenes, Alkyl diacrylates.
• Plastic dispersions should also be mentioned here Basis of vinyl acetates and acrylic resins.
• water soluble Dispersions of polyvinyl alcohol, polyvinyl methyl ether, polyacrylic acid Salts and copolymers, polyvinyl pyrrilidone, water-soluble cellulose ethers influence the marking result with laser bombardment positively.
• the base paper is preferably included Binders from the field of styrene copolymers with butadiene, coated.
• the above-mentioned binders can also be used in the Finishing of the paper can be used.
• As a retention agent to retain the fine and fillers during the Paper production is mainly aluminum sulfate and synthetic cationic compounds, such as. B. ethyleneimine polymers used.
• dispersants are also recommended, since the inorganic, platelet-shaped substrates as homogeneous as possible in the Paper pulp should be spread out to give an even, clear marking to be able to achieve.
• Suitable dispersants are e.g. B. Byk 410 (Byk-Chemie), Laponite RD / RDS (Laporte), Calgon new (BK Ladenburg) and polysalt SK (BASF).
• the pulp becomes optical Brightener added to increase the whiteness.
• the paper can also additionally contain flame retardants and / or light-sensitive pigments.
• flame retardants and / or light-sensitive pigments the oxides, hydroxides, sulfides, sulfates and phosphates of copper, bismuth, tin, zinc, silver, antimony, manganese, iron, nickel and chromium are to be mentioned here.
• copper phosphate in particular a copper (II) hydroxide phosphate, should be mentioned in particular.
• Particularly preferred here is a product such as is produced by heating blue Cu (II) orthophophate (Cu 3 (PO 4 ) 2 * 3H 2 O) by heating to 100 to 200 ° C and the chemical formula 4CuO * P 2 O 5 * H 2 O or Cu 3 (PO 4 ) 2 * Cu (OH) 2 .
• copper phosphates are 6CuO * P 2 O 5 * 3H 2 O, Cu 3 (PO 4 ) 2 * 3Cu (OH) 2 , 5CuO * P 2 O 5 * 3H 2 O, Cu 3 (PO 4 ) 2 * 2Cu ( OH) 2 * H 2 O, 4CuO * P 2 O 5 , 4CuO * P 2 O 5 * 3H 2 O, 4CuO * P 2 O 5 * 1.5H 2 O, 4 CuO * P 2 O 5 * 1.2H 2 O.
• the percentage by weight of light sensitive pigments in the pulp in Combination with the absorbents should total 10% by weight in relation to the pulp.
• the mixing ratio of the light-sensitive pigments with the platelet-shaped ones inorganic substrates are not subject to any particular ones Limitation.
• the light-sensitive pigments are preferably added together with the absorber, but in principle the separate addition is also possible. It can also be a mixture of different light sensitive pigments Paper pulp to be added.
• the use of the paper product pigmented according to the invention can be done in all areas where previously common ink jet processes or Laser marking by removing printing inks for lettering of papers are used.
• the marking and labeling from e.g. Labels, all types of paper packaging for household products and consumer goods, wrapping paper, packaging for Cigarettes and cosmetics can be found even in hard-to-reach places be marked with the help of laser light.
• the invention Paper product due to its low heavy metal content used in packaging in the food or toy sector become.
• the markings on the packaging are characterized by this from that they are smudge-proof and scratch-resistant, hygienically pure during the marking process are applicable.
• Another important area of application for laser marking are graphic products with a permanent and Counterfeit-proof marking that also meets the highest aesthetic standards the high quality packaging printing by no white or black areas for later laser marking in the design needs to be printed more.
• Another area of application are security and securities.
• the marked paper products and cardboard boxes can continue subsequently printed and processed, e.g. lacquered, laminated or sealed without affecting the markability.
• Base paper with a basis weight of approx. 70 g / m 2 consisting of:
• the label paper produced in this way is labeled with a laser.
• the Marking with a YAG laser (1500 Hz, 19A, 20 mm / s) leads to a dark, sharp-edged marking with a high contrast.
• Base paper with a basis weight of approx. 70 g / m 2 consisting of:
• the label paper is labeled with a CO 2 laser (energy density -2 J / cm 2 ).
• the marking leads to a dark, sharp-edged marking.
• Base paper with a basis weight of approx. 70 g / m 2 consisting of:
• the label paper is used with a YAG laser (1500 Hz, 19A, 20 mm / s) labeled.
• the marking is dark and sharp and shows one high contrast.
• Base paper with a basis weight of approx. 70 g / m 2 consisting of:
• the label paper is used with a YAG laser (1500 Hz, 19A, 20 mm / s) labeled.
• the marking is dark and sharp and shows one high contrast.
• the coated paper shows a dark marking and a high contrast with a CO 2 laser (energy density -2 J / cm 2 ).
• the coated paper shows a dark marking and a high contrast with a CO 2 laser (energy density -2 J / cm 2 ).
• the label paper is used with a YAG laser (1500 Hz, 19A, 20 mm / s) labeled.
• the marking is dark and sharp and shows one high contrast.
• the coated paper shows a dark marking and a high contrast with a CO 2 laser (energy density -2 J / cm 2 ).
• the cardboard shows with a CO 2 laser (energy density -2 J / cm 2 ) a dark marking and a high contrast.

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• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Paper (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)
• Laser Beam Processing (AREA)

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• 1997
  • 1997-07-30 DE DE1997132860 patent/DE19732860A1/de not_active Withdrawn
• 1998
  • 1998-07-16 EP EP19980113240 patent/EP0894896A3/fr not_active Withdrawn
  • 1998-07-29 JP JP21391398A patent/JPH11100796A/ja active Pending
  • 1998-07-30 US US09/124,848 patent/US6306493B1/en not_active Expired - Fee Related

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