EP2646255A1 - Method for processing plastic material, and the processed plastic material - Google Patents

Method for processing plastic material, and the processed plastic material

Info

Publication number
EP2646255A1
EP2646255A1 EP11845179.8A EP11845179A EP2646255A1 EP 2646255 A1 EP2646255 A1 EP 2646255A1 EP 11845179 A EP11845179 A EP 11845179A EP 2646255 A1 EP2646255 A1 EP 2646255A1
Authority
EP
European Patent Office
Prior art keywords
plastic material
coating
printing
binder
mixture
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP11845179.8A
Other languages
German (de)
French (fr)
Other versions
EP2646255A4 (en
EP2646255B1 (en
Inventor
Matti SYRJÄLÄ
Mika SJÖHOLM
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to PL11845179T priority Critical patent/PL2646255T3/en
Publication of EP2646255A1 publication Critical patent/EP2646255A1/en
Publication of EP2646255A4 publication Critical patent/EP2646255A4/en
Application granted granted Critical
Publication of EP2646255B1 publication Critical patent/EP2646255B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • 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
    • B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
    • 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
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
    • 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
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5236—Macromolecular coatings characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose
    • 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
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers

Definitions

  • the invention relates to a method for processing plastic material as defined in the preamble of claim 1 and to the processed plastic material as defined in the preamble of claim 11.
  • plastic-based materials known from the prior art are difficult to be printed.
  • Plastic-based material cannot be conven- tionally printed by the generally known printing methods because the printing ink cannot be adhered and absorbed in the plastic-based material, whereby the printing ink will not dry and the impression becomes messy and staining.
  • spreading the print- ing ink on the surface of a plastic material often provides a waving effect in the material, whereby the material becomes cockled.
  • the invention is based on a method for processing plastic material in order to print the plastic material.
  • at least one surface of the plastic material is coated with at least one coating mixture that contains a pigment and a binder to provide a coating layer, and the plastic material is charged electrically.
  • at least one surface of the plastic material is coated with at least one coating layer.
  • the invention is based on the corresponding processed plastic material.
  • the plastic material is processed by coating at least one of its surfaces with at least one coating mixture that contains a pigment and a binder to form a coating layer on the surface of the plastic material.
  • the plastic material is has been charged electrically.
  • the invention is specifically based on the coating of plastic material, such as a plastic web, sheet or the like, so as to provide a good base for printing in order to print the plastic material by any printing technique.
  • plastic material such as a plastic web, sheet or the like
  • the invention is based on the basic idea of providing increased pore volume to the surface of the dense plastic material and absorbing the printing ink better and faster in the surface of the plastic material.
  • the invention is based on the processing of electrically charged or electrically chargeable plastic material so that the plastic material will be easily printable by a desired printing technique.
  • Electrically charged plastic material in this context refers to electrically charged material that is self-adhesive by virtue of the electrical charge. Electrically chargeable plastic material in this context refers to electrically chargeable material that is self-adhesive after generation of the electrical charge .
  • the purpose of the coating layer that is formed from a coating mixture is, in the context of this invention, to act as a printing ink adhesion basis in which the printing ink is absorbed and adhered irrespective of the printing method.
  • the coating layer must be functional in home printing as well as in in- dustrial printing.
  • Each coating layer may be formed from the same coating mixture.
  • at least one coating layer is formed from a. different coating mixture than the rest of the coating layers.
  • the surface of the plastic material is provided with a first and a second coating layer, and the second coating layer is formed from a different coating mixture than the first coating layer.
  • the coating mixture contains 5 to 80 w-% of the binder, in one em- bodiment 10 to 30 w-% of the binder.
  • the coating mixture contains 30 to 70 w-%, in one embodiment 40 to 60 w-%, of alcohol.
  • the binder is selected from the group of latex, starch, protein, e.g. casein, adhesive, resin and their combinations.
  • the coating mixture contains an additive and/or a filler.
  • the filler may have been selected from the coating mixture fillers known per se.
  • the coating mixture contains an additive, such as a rheology modifier, e.g. CMC, to modify the rheology, e.g. to raise the viscosity.
  • a rheology modifier e.g. CMC
  • the coating mixture contains less than 1.5 w-%, in one embodiment approxi- mately 1 w-%, of the additive for raising the viscosity.
  • the additives may include other suitable and desired additives, e.g. colorants, auxiliary pigments, strength improving agents, plasti- cizers, lubricants, wet strength improving agents, dispersing agents, defoamers and/or optical brighten- ers or other agents required by the purpose of use.
  • suitable and desired additives e.g. colorants, auxiliary pigments, strength improving agents, plasti- cizers, lubricants, wet strength improving agents, dispersing agents, defoamers and/or optical brighten- ers or other agents required by the purpose of use.
  • the pigment is selected from the group of mineral-based pigments, calcium carbonates, such as PCC and GCC, kaolin, talc, gypsum, titanium dioxide, organic pigments, e.g. plastic pigments, cellulose-based pigments and their different combinations.
  • the employed pigment is a combination of several pigments to obtain the best properties, e.g. lightness, porosity, printing ink absorption, runnability, opacity, gloss, bulk etc. for the coating layer.
  • the size of the pigment particles in the coating mixture is less than 10 urn, pref- erably 0.2 to 5 ym, in the coating of the plastic ma ⁇ terial .
  • the amount of coating in the coating layer on the surface of the plastic material ranges from 1 to 40 g/m 2 , in one embodiment from 5 to 10 g/m 2 , in one embodiment from 10 to 20 g/m 2 , in one embodiment is at least 20 g/m 2 and in one embodi- ment from 20 to 30 g/m 2 .
  • the thickness of the coating layer depends on the employed printing method and the employed amount of ink.
  • the coating layer acts as an absorber for the solvent in the printing ink.
  • the thickness of the coating layer is defined so as to prevent a heat shock effect during printing on the surface of the plastic material, e.g. in laser printing.
  • the plas- tic material is precoated with a preliminary mixture before coating the plastic material with the coating mixture. Coating with the preliminary mixture and the coating mixture may be effected substantially in the same process or sequentially in a two-step process or in completely different processes.
  • the preliminary mixture contains a pigment and a binder.
  • the preliminary mixture contains latex but not substantially a pigment.
  • the preliminary mixture has substantially the same composi- tion as the coating mixture but may have a coarser particle size distribution.
  • the preliminary mixture includes an additive. By precoating, it is possible to improve the adhesion and spreading of the coating mixture on the surface of the plastic material. In one embodiment, the amount of precoating is approximately 1 to 5 g/m 2 . In one embodiment, the size of the pigment particles in the preliminary mixture is less than 10 ym, preferably 1 to 5 pm.
  • the plastic material is se- lected from any suitable plastics and their different combinations.
  • the plastic material is selected so as to be able to receive an electrical charge.
  • the plastic material is polypropylene or a derivative thereof.
  • the plastic material may be present in the form of a web, film, sheet or the like .
  • the plastic material is electrically chargeable.
  • the plastic material is charged electrically.
  • the plastic material is charged electrically before coating. This way, the surface of the plastic material is provided with surface energy, which improves spreading of the coating mixture on the surface of the plastic material and its adhesion on the surface of the plastic material.
  • the plastic material is charged electrically after coating.
  • the electrical charging is effected by means of a corona treatment.
  • the amount of the electrical charge provided to the plastic material depends on the thickness and thereby the weight of the coating layer. In one embodiment, the electrical charge must be raised as the weight of the material increases.
  • the plastic material is provided onto a carrier material.
  • the carri- er material facilitates the processing of the plastic material.
  • the plastic material can be separated from the carrier material when it is being brought into use and is to be attached to a desired position and to a desired base.
  • the elec ⁇ trical charge of the plastic material is activated and the plastic material can be attached to the desired base .
  • an insula- tion layer is provided between the plastic material and the coating layer.
  • the insulation layer the plastic material can be protected e.g. in the printing from the effect of heat and heat shocks.
  • the plastic material may be formed by any method and/or device known per se.
  • the plastic material may be of any color, and it may be monochromatic or pat- terned.
  • the surface of the plastic material may be modified, e.g. grooved.
  • the plastic material is coated by blade coating, spray coating, rod coating, film transfer coating, curtain coating, offset machine, rotogravure machine or flexographic press or their different combinations. In one embodiment, the plastic material is coated by blade coating. In one embodiment, the plastic material is coated by spray coating. In one embodiment, the precoating and actual coating of the plastic material can be effected by the same coating method or alternatively by different coating methods.
  • the coated plastic materi- al is dried after coating or between the different coating steps.
  • the coated plastic material is used in printing selected from the group of: offset printing, digital printing, laser printing, inkjet printing and their combinations.
  • the plastic material can be colored and/or patterned in connection with the manufacture, coating and/or printing of the plastic material.
  • the plastic material according to the invention can be manufac- tured with a mat or glossy surface.
  • the material according to the invention can be used as note sheets, memos, posters, decorative material, interior decoration material, window decorations or in equivalent purposes of use.
  • the material according to the invention can be used in households, offices, commerce or other desired applications.
  • the plastic material according to the invention is not dependent on the printing method, but the coated plastic material can be printed by any printing technique.
  • the coating layer according to the invention absorbs the printing ink, whereby the surface of the plastic material becomes tack-free practically immediately after printing.
  • the plastic material according to the invention provides new possibilities for use.
  • the plastic material according to the invention can be used as such or e.g. as combined material with another material.
  • coated plastic material is inexpensive to manufacture, and the desired material can also be manufactured in small batches.
  • Coating mixtures according to the invention were formed in the tests and spread on the surface of an electrically charged polypropylene material.
  • the electrically charged polypropylene material was used to form electrically charged, self-adhesive note sheets.
  • the coating compositions contained as a pigment 50 w-% of calcium carbonate, GCC (HC-60) , and as a binder 10 w-% of latex.
  • the coating mixture consisted mainly of round and coarse calcium carbonate particles, the size of which ranged from 0.2 to 5 m.
  • the coating mixtures contained approximately 1 w-% of CMC and 40 w-% of water and, in some cases, 1 to 2 w-% of alcohol.
  • the polypropylene material was charged electrically by a corona treatment to form a self-adhesive plastic film and precoated by a preliminary mixture that contained latex. The precoating was provided to the surface of the polypropylene by approximately 3 g/m 2 .
  • the polypropylene material was coated with the coating mixtures by sheet blade coating to form a coating layer on the surface of the polypropylene ma- terial.
  • the amount of the coating layer was approximately 20 g/m 2 .
  • Blade coating is a coating method that is known per se and is not described in more detail in this connection.
  • the coating mixtures were well spread on the surface of the polypropylene material.
  • the precoating and coating of the polypropylene material were effected in sequential steps.
  • coated polypropylene materials were printed by different printing methods; inkjet, laser printing and digital printing technique.
  • Coating mixtures according to the invention were formed in the tests and spread on the surface of an electrically charged polypropylene material.
  • the coating mixtures contained as a pigment 35 w-% of calcium carbonate, GCC (HC-60), and as a binder 30 w-% of resin.
  • the coating mixture consisted mainly of round and coarse calcium carbonate parti- cles, the size of which ranged from 0.2 to 5 ym.
  • the coating mixtures contained approximately 30 to 40 w-% of alcohol.
  • the polypropylene material was coated with the coating mixtures by film transfer coating to form a coating layer on the surface of the polypropylene material.
  • the amount of the coating layer was approximately 15 g/m 2 .
  • the coating mixtures were well spread on the surface of the polypropylene material.
  • Precoating and two surface coatings of the polypropylene material were effected in sequential steps .
  • coated polypropylene materials were printed by different printing methods; inkjet, laser printing and digital printing technique.
  • Coating mixtures according to the invention were formed in the tests and spread on the surface of an electrically charged polypropylene material.
  • the polypropylene material was provided by lamination onto paperboard that acted as a carrier material.
  • the coating mixtures contained as a pigment 20 w-% of calcium carbonate, GCC (HC-60) , and as a binder 40 w-% of resin.
  • the coating mixture consisted mainly of round and coarse calcium carbonate particles, the size of which ranged from 0.2 to 5 m.
  • the coating mixtures contained approximately 1 w-% of a plasticizer, e.g. calcium stearate, and 40 w-% of alcohol.
  • the polypropylene material was coated with the coating mixtures by sheet blade coating to form a coating layer on the surface of the polypropylene ma- terial.
  • the amount of the coating layer was approximately 10 g/m2.
  • the coating mixtures were well spread on the surface of the polypropylene material.
  • Precoating and coating of the polypropylene material were performed sequentially.
  • the coated polypropylene materials were printed by different printing methods; inkjet, laser printing and digital printing technique. It was discovered that large pore volume and large pores wherein the printing ink was well absorbed were provided in all tests to the surface of the plastic material by the tested coating mixtures. In addition, the printing ink was well adhered to the coating layer, and the surface of the coated material was practically immediately tack-free.
  • the method for processing plastic material and the processed plastic material according to the invention are suitable in different embodiments to be used in different printing purposes.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)

Abstract

The invention relates to a method for processing plastic material in order to print the plastic material. According to the invention, at least one surface of the plastic material is coated with a coating mixture that contains a pigment and a binder to provide a coating layer, and the plastic material is charged electrically. In addition, the invention relates to the corresponding processed plastic material.

Description

METHOD FOR PROCESSING PLASTIC MATERIAL, AND THE PROCESSED PLASTIC MATERIAL
FIELD OF THE INVENTION
The invention relates to a method for processing plastic material as defined in the preamble of claim 1 and to the processed plastic material as defined in the preamble of claim 11. BACKGROUND OF THE INVENTION
Known from the prior art are many different plastic-based materials.
Also known from the prior art are electrically charged note sheets and the like formed from plas- tic-based material that can be attached on different bases by means of the electrical charge. In addition, known from the prior art are different sticker- and adhesive-surfaced note sheets formed from plastic- and paper-based materials, the problem of which is that the sticker or adhesive surface easily leaves a mark on the base on which it has been attached.
The problem in the plastic-based materials known from the prior art is that they are difficult to be printed. Plastic-based material cannot be conven- tionally printed by the generally known printing methods because the printing ink cannot be adhered and absorbed in the plastic-based material, whereby the printing ink will not dry and the impression becomes messy and staining. In addition, spreading the print- ing ink on the surface of a plastic material often provides a waving effect in the material, whereby the material becomes cockled.
OBJECTIVE OF THE INVENTION An objective of the invention is to eliminate the drawbacks referred to above and to disclose a new type of a method for processing plastic material. Another objective of the invention is to disclose a new type of plastic material that is suitable to be printed by the known printing methods.
SUMMARY OF THE INVENTION
The method and the plastic material according to the invention are characterized by what has been presented in the claims.
The invention is based on a method for processing plastic material in order to print the plastic material. According to the invention, at least one surface of the plastic material is coated with at least one coating mixture that contains a pigment and a binder to provide a coating layer, and the plastic material is charged electrically. Preferably, at least one surface of the plastic material is coated with at least one coating layer.
In addition, the invention is based on the corresponding processed plastic material. According to the invention, the plastic material is processed by coating at least one of its surfaces with at least one coating mixture that contains a pigment and a binder to form a coating layer on the surface of the plastic material. The plastic material is has been charged electrically.
The invention is specifically based on the coating of plastic material, such as a plastic web, sheet or the like, so as to provide a good base for printing in order to print the plastic material by any printing technique. The invention is based on the basic idea of providing increased pore volume to the surface of the dense plastic material and absorbing the printing ink better and faster in the surface of the plastic material. In addition, the invention is based on the processing of electrically charged or electrically chargeable plastic material so that the plastic material will be easily printable by a desired printing technique.
Electrically charged plastic material in this context refers to electrically charged material that is self-adhesive by virtue of the electrical charge. Electrically chargeable plastic material in this context refers to electrically chargeable material that is self-adhesive after generation of the electrical charge .
The purpose of the coating layer that is formed from a coating mixture is, in the context of this invention, to act as a printing ink adhesion basis in which the printing ink is absorbed and adhered irrespective of the printing method. The coating layer must be functional in home printing as well as in in- dustrial printing. Each coating layer may be formed from the same coating mixture. Alternatively, at least one coating layer is formed from a. different coating mixture than the rest of the coating layers. In one embodiment, the surface of the plastic material is provided with a first and a second coating layer, and the second coating layer is formed from a different coating mixture than the first coating layer.
In one embodiment of the invention, the coating mixture contains 5 to 80 w-% of the binder, in one em- bodiment 10 to 30 w-% of the binder.
In one embodiment of the invention, the coating mixture contains 30 to 70 w-%, in one embodiment 40 to 60 w-%, of alcohol.
In one embodiment of the invention, the binder is selected from the group of latex, starch, protein, e.g. casein, adhesive, resin and their combinations. In one embodiment of the invention, the coating mixture contains an additive and/or a filler. The filler may have been selected from the coating mixture fillers known per se.
In one embodiment of the invention, the coating mixture contains an additive, such as a rheology modifier, e.g. CMC, to modify the rheology, e.g. to raise the viscosity. In one embodiment, the coating mixture contains less than 1.5 w-%, in one embodiment approxi- mately 1 w-%, of the additive for raising the viscosity.
In one embodiment, the additives may include other suitable and desired additives, e.g. colorants, auxiliary pigments, strength improving agents, plasti- cizers, lubricants, wet strength improving agents, dispersing agents, defoamers and/or optical brighten- ers or other agents required by the purpose of use.
In one embodiment of the invention, the pigment is selected from the group of mineral-based pigments, calcium carbonates, such as PCC and GCC, kaolin, talc, gypsum, titanium dioxide, organic pigments, e.g. plastic pigments, cellulose-based pigments and their different combinations. In one embodiment, the employed pigment is a combination of several pigments to obtain the best properties, e.g. lightness, porosity, printing ink absorption, runnability, opacity, gloss, bulk etc. for the coating layer.
In one embodiment, the size of the pigment particles in the coating mixture is less than 10 urn, pref- erably 0.2 to 5 ym, in the coating of the plastic ma¬ terial .
In one embodiment, the amount of coating in the coating layer on the surface of the plastic material ranges from 1 to 40 g/m2, in one embodiment from 5 to 10 g/m2, in one embodiment from 10 to 20 g/m2, in one embodiment is at least 20 g/m2 and in one embodi- ment from 20 to 30 g/m2. Preferably, the thickness of the coating layer depends on the employed printing method and the employed amount of ink. Preferably, the coating layer acts as an absorber for the solvent in the printing ink. Preferably, the thickness of the coating layer is defined so as to prevent a heat shock effect during printing on the surface of the plastic material, e.g. in laser printing.
In one embodiment of the invention, the plas- tic material is precoated with a preliminary mixture before coating the plastic material with the coating mixture. Coating with the preliminary mixture and the coating mixture may be effected substantially in the same process or sequentially in a two-step process or in completely different processes. In one embodiment, the preliminary mixture contains a pigment and a binder. In one embodiment, the preliminary mixture contains latex but not substantially a pigment. In one embodiment, the preliminary mixture has substantially the same composi- tion as the coating mixture but may have a coarser particle size distribution. In one embodiment, the preliminary mixture includes an additive. By precoating, it is possible to improve the adhesion and spreading of the coating mixture on the surface of the plastic material. In one embodiment, the amount of precoating is approximately 1 to 5 g/m2. In one embodiment, the size of the pigment particles in the preliminary mixture is less than 10 ym, preferably 1 to 5 pm.
In one embodiment, the plastic material is se- lected from any suitable plastics and their different combinations. In one embodiment, the plastic material is selected so as to be able to receive an electrical charge. In one embodiment, the plastic material is polypropylene or a derivative thereof. The plastic material may be present in the form of a web, film, sheet or the like . In one embodiment of the invention, the plastic material is electrically chargeable. In one embodiment, the plastic material is charged electrically. In one embodiment, the plastic material is charged electrically before coating. This way, the surface of the plastic material is provided with surface energy, which improves spreading of the coating mixture on the surface of the plastic material and its adhesion on the surface of the plastic material. In one embodiment, the plastic material is charged electrically after coating. In one embodiment, the electrical charging is effected by means of a corona treatment.
In one embodiment, the amount of the electrical charge provided to the plastic material depends on the thickness and thereby the weight of the coating layer. In one embodiment, the electrical charge must be raised as the weight of the material increases.
In one embodiment of the invention, the plastic material is provided onto a carrier material. The carri- er material facilitates the processing of the plastic material. Preferably, the plastic material can be separated from the carrier material when it is being brought into use and is to be attached to a desired position and to a desired base. As the plastic materi- al is separated from the carrier material, the elec¬ trical charge of the plastic material is activated and the plastic material can be attached to the desired base .
In one embodiment of the invention, an insula- tion layer is provided between the plastic material and the coating layer. By the insulation layer, the plastic material can be protected e.g. in the printing from the effect of heat and heat shocks.
The plastic material may be formed by any method and/or device known per se. The plastic material may be of any color, and it may be monochromatic or pat- terned. The surface of the plastic material may be modified, e.g. grooved.
In one embodiment, the plastic material is coated by blade coating, spray coating, rod coating, film transfer coating, curtain coating, offset machine, rotogravure machine or flexographic press or their different combinations. In one embodiment, the plastic material is coated by blade coating. In one embodiment, the plastic material is coated by spray coating. In one embodiment, the precoating and actual coating of the plastic material can be effected by the same coating method or alternatively by different coating methods.
In one embodiment, the coated plastic materi- al is dried after coating or between the different coating steps.
In one embodiment of the invention, the coated plastic material is used in printing selected from the group of: offset printing, digital printing, laser printing, inkjet printing and their combinations.
The plastic material can be colored and/or patterned in connection with the manufacture, coating and/or printing of the plastic material. The plastic material according to the invention can be manufac- tured with a mat or glossy surface.
The material according to the invention can be used as note sheets, memos, posters, decorative material, interior decoration material, window decorations or in equivalent purposes of use. The material according to the invention can be used in households, offices, commerce or other desired applications.
The plastic material according to the invention is not dependent on the printing method, but the coated plastic material can be printed by any printing technique. The coating layer according to the invention absorbs the printing ink, whereby the surface of the plastic material becomes tack-free practically immediately after printing.
The plastic material according to the invention provides new possibilities for use. The plastic material according to the invention can be used as such or e.g. as combined material with another material.
Another advantage of the invention is that the coated plastic material is inexpensive to manufacture, and the desired material can also be manufactured in small batches. DETAILED DESCRIPTION OF THE INVENTION
In the following section, the invention will be described with detailed examples of its embodiments . Example 1
Coating mixtures according to the invention were formed in the tests and spread on the surface of an electrically charged polypropylene material. The electrically charged polypropylene material was used to form electrically charged, self-adhesive note sheets.
The coating compositions contained as a pigment 50 w-% of calcium carbonate, GCC (HC-60) , and as a binder 10 w-% of latex. The coating mixture consisted mainly of round and coarse calcium carbonate particles, the size of which ranged from 0.2 to 5 m. In addition, the coating mixtures contained approximately 1 w-% of CMC and 40 w-% of water and, in some cases, 1 to 2 w-% of alcohol. Before coating, the polypropylene material was charged electrically by a corona treatment to form a self-adhesive plastic film and precoated by a preliminary mixture that contained latex. The precoating was provided to the surface of the polypropylene by approximately 3 g/m2.
The polypropylene material was coated with the coating mixtures by sheet blade coating to form a coating layer on the surface of the polypropylene ma- terial. The amount of the coating layer was approximately 20 g/m2. Blade coating is a coating method that is known per se and is not described in more detail in this connection. The coating mixtures were well spread on the surface of the polypropylene material.
The precoating and coating of the polypropylene material were effected in sequential steps.
The coated polypropylene materials were printed by different printing methods; inkjet, laser printing and digital printing technique.
Example 2
Coating mixtures according to the invention were formed in the tests and spread on the surface of an electrically charged polypropylene material.
The coating mixtures contained as a pigment 35 w-% of calcium carbonate, GCC (HC-60), and as a binder 30 w-% of resin. The coating mixture consisted mainly of round and coarse calcium carbonate parti- cles, the size of which ranged from 0.2 to 5 ym. In addition, the coating mixtures contained approximately 30 to 40 w-% of alcohol.
The polypropylene material was coated with the coating mixtures by film transfer coating to form a coating layer on the surface of the polypropylene material. The amount of the coating layer was approximately 15 g/m2. The coating mixtures were well spread on the surface of the polypropylene material.
Precoating and two surface coatings of the polypropylene material were effected in sequential steps .
The coated polypropylene materials were printed by different printing methods; inkjet, laser printing and digital printing technique.
Example 3
Coating mixtures according to the invention were formed in the tests and spread on the surface of an electrically charged polypropylene material. The polypropylene material was provided by lamination onto paperboard that acted as a carrier material.
The coating mixtures contained as a pigment 20 w-% of calcium carbonate, GCC (HC-60) , and as a binder 40 w-% of resin. The coating mixture consisted mainly of round and coarse calcium carbonate particles, the size of which ranged from 0.2 to 5 m. In addition, the coating mixtures contained approximately 1 w-% of a plasticizer, e.g. calcium stearate, and 40 w-% of alcohol.
The polypropylene material was coated with the coating mixtures by sheet blade coating to form a coating layer on the surface of the polypropylene ma- terial. The amount of the coating layer was approximately 10 g/m2. The coating mixtures were well spread on the surface of the polypropylene material.
Precoating and coating of the polypropylene material were performed sequentially. The coated polypropylene materials were printed by different printing methods; inkjet, laser printing and digital printing technique. It was discovered that large pore volume and large pores wherein the printing ink was well absorbed were provided in all tests to the surface of the plastic material by the tested coating mixtures. In addition, the printing ink was well adhered to the coating layer, and the surface of the coated material was practically immediately tack-free.
It was discovered that the invention provides for the easy printing of plastic material without staining. In addition, in additional tests it was dis- covered that a plastic material that is suitable to be printed was provided using many different coating mixture ratios.
The method for processing plastic material and the processed plastic material according to the invention are suitable in different embodiments to be used in different printing purposes.
The invention is not limited merely to the examples referred to above; instead, many variations are possible within the scope of the inventive idea defined by the claims.

Claims

1. A method for processing plastic material in order to print the plastic material, c ha r a c t e r - i z e d in that at least one surface of the plastic material is coated with a coating mixture that contains a pigment and a binder to provide a coating layer, and the plastic material is charged electrically.
2. The method according to claim 1, ch a r - a c t e r i z e d in that the coating mixture is provided with 5 to 80 w-% of the binder.
3. The method according to claim 1 or 2, c h a r a c t e r i z e d in that the binder is selected from the group of latex, starch, protein, adhesive, res- in and their combinations.
4. The method according to any one of claims 1 to 3, c h a r a c t e r i z e d in that an additive is added to the coating mixture to modify the rheology.
5. The method according to any one of claims 1 to 4, c h a r a c t e r i z e d in that the pigment is selected from the group of mineral-based pigments, calcium carbonates, kaolin, talc, gypsum, titanium dioxide, organic pigments, cellulose-based pigments and their combinations .
6. The method according to any one of claims
1 to 5, c h a r a c t e r i z e d in that the plastic material is provided onto a carrier material.
7. The method according to any one of claims 1 to 6, ch a r a c t e r i z e d in that the plastic ma- terial is charged electrically before coating.
8. The method according to any one of claims 1 to 7, c h a r a c t e r i z e d in that the plastic material is charged electrically after coating.
9. The method according to any one of claims 1 to 8, c h a r a c t e r i z e d in that the plastic material is precoated with a preliminary mixture before coating of the plastic material with the coating mixture .
10. The method according to any one of claims
I to 9, c h a r a c t e r i z e d in that an insulation layer is provided between the plastic material and the coating layer.
11. Plastic material, ch a r a c t e r i z e d in that the plastic material is processed by coating at least one of its surfaces with a coating mixture that contains a pigment and a binder to form a coating layer on the surface of the plastic material, wherein the plastic material has been charged electrically.
12. The plastic material according to claim 11, c h a r a c t e r i z e d in that the coating mixture contains 5 to 80 w-% of the binder.
13. The plastic material according to claim
II or 12, ch a r a c t e r i z e d in that the binder is selected from the group of latex, starch, protein, adhesive, resin and their combinations.
14. The plastic material according to any one of claims 11 to 13, c h a r a c t e r i z e d in that the pigment is selected from the. group of mineral-based pigments, calcium carbonates, kaolin, talc, gypsum, titanium dioxide, organic pigments, cellulose-based pigments and their combinations.
15. The plastic material according to any one of claims 11 to 14, c h a r a c t e r i z e d in that the plastic material has been charged electrically.
16. The plastic material according to any one of claims 11 to 15, c h a r a c t e r i z e d in that the plastic material is provided onto a carrier material.
17. The plastic material according to any one of claims 11 to 16, c h a r a c t e r i z e d in that a precoating layer is provided on the surface of the plastic material, under the coating layer.
18. The plastic material according to any one of claims 11 to 17, c h a r a c t e r i z e d in that an insulation layer is provided between the plastic material and the coating layer.
19. The plastic material according to any one of claims 11 to 18, c h a r a c t e r i z e d in that the coated plastic material is used in printing selected from the group of: offset printing, digital printing, laser printing, inkjet printing and their combina- tions.
EP11845179.8A 2010-12-03 2011-12-02 Method for processing plastic material, and the processed plastic material Not-in-force EP2646255B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11845179T PL2646255T3 (en) 2010-12-03 2011-12-02 Method for processing plastic material, and the processed plastic material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20106287A FI124399B (en) 2010-12-03 2010-12-03 A method for treating a plastic material and a treated plastic material
PCT/FI2011/051072 WO2012072888A1 (en) 2010-12-03 2011-12-02 Method for processing plastic material, and the processed plastic material

Publications (3)

Publication Number Publication Date
EP2646255A1 true EP2646255A1 (en) 2013-10-09
EP2646255A4 EP2646255A4 (en) 2014-06-25
EP2646255B1 EP2646255B1 (en) 2015-07-08

Family

ID=43414982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11845179.8A Not-in-force EP2646255B1 (en) 2010-12-03 2011-12-02 Method for processing plastic material, and the processed plastic material

Country Status (4)

Country Link
EP (1) EP2646255B1 (en)
FI (1) FI124399B (en)
PL (1) PL2646255T3 (en)
WO (1) WO2012072888A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8803071D0 (en) 1988-02-10 1988-03-09 Jennings A B Improvements in/relating to writing surfaces
US5789123A (en) 1995-02-03 1998-08-04 Mobil Oil Corporation Liquid toner-derived ink printable label
US6309750B1 (en) 1999-10-25 2001-10-30 Supernotes As Adherent plastic note
WO2009154177A1 (en) * 2008-06-16 2009-12-23 株式会社ユポ・コーポレーション Electrostatic attracting sheet

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO2012072888A1 *

Also Published As

Publication number Publication date
WO2012072888A1 (en) 2012-06-07
EP2646255A4 (en) 2014-06-25
FI20106287A (en) 2012-06-04
FI20106287A0 (en) 2010-12-03
FI124399B (en) 2014-08-15
PL2646255T3 (en) 2015-12-31
EP2646255B1 (en) 2015-07-08

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