EP1552057A2 - Support d'impression possedant a la fois une bonne conductivite electrique et une bonne imprimabilite - Google Patents
Support d'impression possedant a la fois une bonne conductivite electrique et une bonne imprimabiliteInfo
- Publication number
- EP1552057A2 EP1552057A2 EP03775453A EP03775453A EP1552057A2 EP 1552057 A2 EP1552057 A2 EP 1552057A2 EP 03775453 A EP03775453 A EP 03775453A EP 03775453 A EP03775453 A EP 03775453A EP 1552057 A2 EP1552057 A2 EP 1552057A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pigment
- parts
- printing medium
- medium according
- under
- 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
Links
Classifications
-
- 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
- D21H19/385—Oxides, hydroxides or carbonates
-
- 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
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
-
- 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
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, 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]
Definitions
- the invention relates to a new printing medium having both good electrical conductivity and good printability.
- printed information has been capable of being detected and recorded using optoelectronic devices which were then responsible for transmitting it to a computer for storage and possible processing.
- the information transmitted is only readable using appropriate reading devices and is not in principle recognizable by optical means.
- the invention therefore aims to provide a printed medium, comprising printed information, which can also be detected other than by strictly optical devices.
- patent FR 2370323 already provided for recording information on a support using conductive ink, and reading the information thus printed using a corona generator sensitive to differences in conductivity in the support.
- the Applicant therefore endeavored, firstly, to provide a device for reading the electrical conductivity which allows a simple, direct and transmittable measurement to a computer and, secondly, improving the electrical conductivity of a layer applied to an information medium by choosing an appropriate conductive pigment.
- the conductive layer used is a layer based on a magnesium fluorosilicate sold under the name "LAPONITE” by Rockwood Additives Limited (UK).
- This synthetic pigment resembles, both by its structure and its chemical composition, a natural mineral hectorite. It results from a synthesis process combining magnesium, lithium, sodium, and sodium fluorosilicate salts carried out under particularly strict speed and temperature conditions.
- the silicates thus synthesized can then have the following empirical chemical formula:
- Si0 2 55.0% MgO 27.0%
- the fluorosilicate powder When added to water, the fluorosilicate powder quickly disperses into primary particles.
- each fluorosilicate unit contained in the crystal has a charge deficiency of -0.7.
- the Applicant therefore carried out tests by depositing a layer based on calcium carbonate or kaolin, pigments frequently used to improve the printability of printing-writing papers, and based on “LAPONITE” on a support intended to be printed, the conductivity of said support being capable of being detected, subsequently, using a reading device as shown in FIG. 1.
- the Applicant found that it was necessary to add a large amount of pigments to obtain good printability, to the detriment of good electrical conductivity, or even acceptable electrical conductivity.
- a first object of the invention therefore aims to provide a printing medium having both good electrical conductivity and good printability.
- the Applicant therefore envisaged adding a coating pigment giving the paper an ink absorption capacity greater than that of traditional coating pigments, such as kaolin or calcium carbonate.
- the fixing of the ink on the paper is generally the result of two complementary processes: the absorption of the fraction of the ink suitable for conveying the color pigment, generally fine oils, and often containing the necessary antioxidants the storage stability and the polymerization by oxidation of the “harder” or varnished resins left on the surface of the paper, this fraction also containing the ink pigments.
- Coated papers are particularly suitable for high quality printing because the ink-carrying part is easily absorbed into the layer by capillary action, while the varnish and pigment are left on the surface where they have a better effect.
- the coating pigments When the coating pigments have a low ink absorption capacity, the vehicle part may not have been completely absorbed by the paper at the time of drying: the varnish therefore has difficulty in fixing. There is therefore a smudging phenomenon which corresponds to a transfer of ink from the front of one sheet to the back of another placed on it.
- Certain coating pigments are therefore used to increase the ink absorption capacity of the layer.
- Another object of the invention is therefore to provide a printing medium covered with a layer, in which the coating pigments give the paper a good ink absorption capacity and limit the phenomenon of powdering during the impression.
- the present invention therefore provides a print medium covered with an electrically conductive layer, wherein said conductive layer contains at least one synthetic pigment electrically conductive and at least one coating pigment having an absorption capacity of oil greater than 80 g / 100 g pigment as measured using the American standard ASTM Standards D 2414.
- the conductive synthetic pigment is a magnesium fluorosilicate.
- the coating pigment is an amorphous silica, said silica preferably having an oil absorption capacity of approximately 200 g / 100 g pigment as measured using the American standard ASTM Standards D 2414.
- the layer contains a mixture of magnesium fluorosilicate, amorphous silica and calcium carbonate.
- the layer contains a mixture of 20 to 100 parts by dry weight of magnesium fluorosilicate, from 0 to 80 parts by dry weight of calcium carbonate and from 0 to 10 parts by dry weight of amorphous silica, and, advantageously, from 60 to 80 parts by dry weight of magnesium fluorosilicate, from 20 to 40 parts by dry weight of calcium carbonate and from 2 to 5 parts by dry weight of amorphous silica.
- the print medium has an optical density of less than 0.8, an optical density determined using the Priifbau print test and for a drying time of 15 seconds.
- the printing medium has a surface resistivity less than 10 10 Olnns, resistivity determined using the American standard ASTM D257-99 and for a relative humidity of 10%.
- the printing medium contains information in the form of an insulating pattern deposited on the conductive layer, said insulating pattern preferably defining, in combination with the underlying conductive layer, a bar code, in which the bars are of variable widths and are alternately conductive and insulating.
- the print medium contains information read using a device sensitive to variations in electrical conductivity and subsequently transmitted to a computer for storage and possible processing.
- the present invention also provides a playing card comprising a printing medium as defined above.
- a coating composition is applied, using a trailing blade coater comprising a pigment of calcium carbonate type at a rate of 12 g / m 2 .
- the coating composition contains: 100 parts of calcium carbonate, marketed by OMYA under the reference Setacarb 80 OG,
- a composition is applied, using an air knife coater coating comprising a conductive synthetic pigment of the magnesium fluorosilicate type at a rate of 4 g / m.
- the coating composition contains:
- Example 3 On one side of a sheet of support paper having a grammage of 325 g / m 2 , sold under the reference OPTIMA P by the Applicant, we apply, using an air knife coater , a coating composition comprising a conductive synthetic pigment of the magnesium fluorosilicate type and a pigment of the kaolin type at a rate of 5.1 g / m 2.
- the coating composition contains: 80 parts of magnesium fluorosilicate, marketed by ROCKWOOD under the reference Laponite JS, 20 parts of a kaolin, marketed by ECC international under the reference Kaolin SPS, - 10 parts of a vinyl acetate ethylene copolymer binder, marketed by VINAMUL under the Vinamul reference 3252.
- a composition is applied, using an air knife coater coating comprising a synthetic conductive pigment of the magnesium fluorosilicate type and a kaolin type pigment at a rate of 5 g / m.
- the coating composition contains: - 20 parts of magnesium fluorosilicate, sold by
- a composition is applied, using an air knife coater coating comprising a conductive synthetic pigment of the magnesium fluorosilicate type and a pigment of the calcium carbonate type at a rate of 5.2 g / m 2 .
- the coating composition contains:
- magnesium fluorosilicate marketed by ROCKWOOD under the reference Laponite JS
- 20 parts of a calcium carbonate sold by OMYA under the reference Hydrocarb 90 OG
- a composition is applied, using an air knife coater coating comprising a synthetic conductive pigment of the magnesium fluorosilicate type and a pigment of the calcium carbonate type at a rate of 4.9 g / m 2.
- the coating composition contains:
- a composition is applied, using an air knife coater coating comprising a synthetic conductive pigment of the magnesium fluorosilicate type and a pigment of the amorphous silica type at a rate of 5.1 g / m 2 .
- the coating composition contains:
- Example 8 On one side of a sheet of support paper having a grammage of 325 g / m, sold under the reference OPTIMA P by the Applicant, there is applied, using an air knife coater, a coating composition comprising a synthetic conductive pigment of the magnesium fluorosilicate type and a pigment of the amorphous silica type at a rate of 5.1 g / m 2 .
- the coating composition contains:
- EXAMPLE 9 On one side of a sheet of support paper having a grammage of 325 g / m 2 , marketed under the reference OPTIMA P by the Applicant, we apply, using an air knife coater , a coating composition comprising a conductive synthetic pigment of the magnesium fluorosilicate type, a pigment of the calcium carbonate type at a rate of 5.2 g / m 2 .
- the coating composition contains:
- a composition is applied, using an air knife coater coating comprising a synthetic conductive pigment of magnesium fluorosilicate type, a pigment of calcium carbonate type and a pigment of silica type at a rate of 5.5 g / m 2 .
- the coating composition contains:
- EXAMPLE 11 On one side of a sheet of support paper having a grammage of 325 g / m 2 , sold under the reference OPTIMA P by the Applicant, we apply, using an air knife coater , a coating composition comprising a conductive synthetic pigment of magnesium fluorosilicate type, a pigment of calcium carbonate type and a pigment of silica type at a rate of 5.5 g / m 2 .
- the coating composition contains:
- a composition of air knife is applied.
- coating comprising a synthetic conductive pigment of magnesium fluorosilicate type, a pigment of calcium carbonate type and a pigment of silica type at a rate of 4.8 g / m.
- the coating composition contains:
- EXAMPLE 13 On one side of a sheet of support paper having a grammage of 325 g / m 2 , marketed under the reference OPTIMA P by the Applicant, we apply, using an air knife coater , a coating composition comprising a synthetic conductive pigment of the magnesium fluorosilicate type, a pigment of the calcium carbonate type and a pigment of the silica type at a rate of 4 g / m 2 .
- the coating composition contains: 67 parts of magnesium fluorosilicate, marketed by
- the Applicant has carried out a certain number of tests making it possible in particular to assess the electrical conductivity and the printability of the paper obtained.
- the electrical surface resistivity in Ohms of the paper is measured using the American standard ASTM D257-99 at different relative humidities.
- the ink drying capacity of the paper is determined by performing the smear test.
- the smear test is carried out as follows: a) test specimens of the paper to be tested are 48 mm wide and 250 mm long b) a Priifbau test apparatus is used having a printing station n ° l and a station n ° 2 for printing transfer c) the pressure of station n ° 1 is adjusted to 1000 N and the pressure of station n ° 2 to 400 N d) the speed of the machine is adjusted to 0.5 m /dry e) the inking roller of station n ° l is inked for 30 sec with a blue ink of the Huber 408010 type, the quantity of ink on the inker being 0.25 cm 3 f) a conveyor fitted with '' a test tube in front of station n ° 1 g) we place an un inked wheel on station n ° 2 h) we print the test tube on station n ° li) we start the stopwatch immediately
- step k) once 15 seconds have elapsed on the stopwatch, the transporter with the printed test tube is advanced to blanket level 1) the test tube from station 2 is immediately separated from its wheel m) the optical density of the cyan transferred to the blank test tube is measured using an Xrite densitometer. n) the operations of steps f) to m) are repeated, varying the time in step k) respectively to 30, 60 and 120 sec.
- the peel strength of the paper is determined by performing an IGT peel test.
- the IGT tear-off test is carried out as follows: a) the paper is cut crosswise into strips 280 mm long by 25 mm wide b) these strips are printed using an IGT device using a medium-draft ink supplied by COATES LORILLEUX under the reference 3804 by varying the printing speed from 0 to 7 m / sec c) the speed from which the tearing is manifested is noted d ) we observe the quantity of paper particles present on the print wheel of the IGT device and the visible tear points on the paper
- the capacity of the conductive layer of the paper to transmit information to a computer by means of an electronic pen is evaluated. This capacity is obviously linked to its own conductive power.
- This test is carried out as follows: a) a transparent insulating varnish which can be treated with ultraviolet rays and supplied by the company VALSPAR (France) is printed on the paper so as to form an insulating pattern in the form of a bar code above the conductive layer, the bar code being representative of a number in binary form, the insulating parts being read as 0 and the conductive parts being read as 1 b) this bar code is scanned using the electronic pen shown in the figure 1, making sure that his other hand is holding the paper on which the barcode is printed c) the pen being connected to a computer, the binary information read is converted into a decimal number by the computer and displayed on a control monitor d) the displayed information is compared with the original information e) if the displayed information is different from the original or non-existent, it is considered that the paper is not sufficiently conductive
- Figure 1 shows, schematically, a possible tubular configuration of this electronic pen (30).
- It consists of a tip-shaped electrode (22) and a second electrode (24).
- the electrode (22) is configured to provide a flat circular contact with a diameter of about 1 mm. It is tensioned by spring, not exceeding a maximum tension of 0, 1 N so as not to damage the surface of the support.
- the second electrode (24) is formed by the tubular aluminum body of the pen (30).
- the operator's hand comes into contact with the external surface of the pen, and thereby with the electrode (24), and completes the electrical circuit formed between the conductive support and the pointed electrode (22).
- An energy source is arranged to apply a voltage of 6 volts across the electrodes (22,24).
- the measuring device comprises a preamplifier (31) and a voltage translator-oscillator (32).
- the high input impedance preamplifier (31) produces a current gain of 50 times at the input of the oscillator (32).
- the input value of the oscillator (32) varies according to whether the electrode (22) is in contact or not with a conductive part of the support, that is to say according to whether or not there is an electrical circuit between the two electrodes.
- a variation in the input of the oscillator (32) produces a variation in the frequency of the output signal, and this change in frequency is used to detect the contacting of the electrode (22) with a conductive or insulating zone. support.
- the oscillator (32) has been configured so that bringing the electrode (22) into contact with a conductive part of the support produces an output of frequency 11 kHz and making a contact of the electrode (22) with an insulating part produces a frequency output of 4 kHz.
- the signal from the oscillator (32) then flows through a small diameter coaxial cable (35), terminated by a plug (36), this plug being inserted into an input terminal of a computer so as to allow the storage and analysis of the input signal by said computer.
- the pen test confirms that the layer does not transmit information due to this low conductivity.
- Comparative Example 2 which corresponds to the conductive layer containing a conductive pigment but no pigment improving the printability, there is, on the contrary, a low resistivity and therefore a high conductivity.
- the pen test is therefore positive.
- optical density during the smear test is greater than 0.8, after 15 sec of drying, which must be judged to be insufficient for offset printing of acceptable quality.
- Example 3 a variable level of coating pigment traditionally used to improve printability, namely kaolin and calcium carbonate, was added to the conductive layer of Example 2.
- Example 7 a variable level of amorphous silica was added to the conductive layer of Example 2, having a better rate of oil absorption than kaolin and calcium carbonate.
- the Applicant therefore used a level of amorphous silica in the layer less than 10 parts by dry weight, and preferably less than 5 parts by dry weight, to avoid these dusting phenomena and compensated by a rate variable of calcium carbonate.
- Example 11 It is effectively verified in Example 11 that a level of magnesium fluorosilicate less than 20 parts by dry weight results in an unacceptable electrical conductivity.
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
- Paints Or Removers (AREA)
- Parts Printed On Printed Circuit Boards (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Photoreceptors In Electrophotography (AREA)
- Developing Agents For Electrophotography (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0212095 | 2002-09-30 | ||
FR0212095A FR2845099B1 (fr) | 2002-09-30 | 2002-09-30 | Support d'impression possedant a la fois une bonne conductivite electrique et une bonne imprimabilite |
PCT/FR2003/002855 WO2004029358A2 (fr) | 2002-09-30 | 2003-09-29 | Support d'impression possedant a la fois une bonne conductivite electrique et une bonne imprimabilite |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1552057A2 true EP1552057A2 (fr) | 2005-07-13 |
EP1552057B1 EP1552057B1 (fr) | 2006-11-08 |
Family
ID=31985346
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03775453A Expired - Lifetime EP1552057B1 (fr) | 2002-09-30 | 2003-09-29 | Support d'impression possedant a la fois une bonne conductivite electrique et une bonne imprimabilite |
Country Status (11)
Country | Link |
---|---|
US (1) | US20060234013A1 (fr) |
EP (1) | EP1552057B1 (fr) |
AT (1) | ATE344849T1 (fr) |
AU (1) | AU2003283481A1 (fr) |
DE (1) | DE60309601T2 (fr) |
DK (1) | DK1552057T3 (fr) |
ES (1) | ES2277128T3 (fr) |
FR (1) | FR2845099B1 (fr) |
HK (1) | HK1082778A1 (fr) |
PT (1) | PT1552057E (fr) |
WO (1) | WO2004029358A2 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2436634A (en) * | 2006-03-28 | 2007-10-03 | Avantone Oy | Machine readable code system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9321171D0 (en) * | 1993-10-13 | 1993-12-01 | Wiggins Teape Group The Limite | Improved printability paperboards |
EP0732218A1 (fr) * | 1995-03-16 | 1996-09-18 | Agfa-Gevaert N.V. | Couches réceptrices d'encre pour éléments d'enregistrement par jet d'encre |
US5989696A (en) * | 1996-02-13 | 1999-11-23 | Fort James Corporation | Antistatic coated substrates and method of making same |
JPH1086536A (ja) * | 1996-09-19 | 1998-04-07 | Sony Corp | 被記録材及び記録方法 |
-
2002
- 2002-09-30 FR FR0212095A patent/FR2845099B1/fr not_active Expired - Fee Related
-
2003
- 2003-09-29 US US10/529,542 patent/US20060234013A1/en not_active Abandoned
- 2003-09-29 DE DE2003609601 patent/DE60309601T2/de not_active Expired - Fee Related
- 2003-09-29 AU AU2003283481A patent/AU2003283481A1/en not_active Abandoned
- 2003-09-29 PT PT03775453T patent/PT1552057E/pt unknown
- 2003-09-29 DK DK03775453T patent/DK1552057T3/da active
- 2003-09-29 ES ES03775453T patent/ES2277128T3/es not_active Expired - Lifetime
- 2003-09-29 EP EP03775453A patent/EP1552057B1/fr not_active Expired - Lifetime
- 2003-09-29 AT AT03775453T patent/ATE344849T1/de not_active IP Right Cessation
- 2003-09-29 WO PCT/FR2003/002855 patent/WO2004029358A2/fr active IP Right Grant
-
2006
- 2006-01-11 HK HK06100447A patent/HK1082778A1/xx not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2004029358A3 * |
Also Published As
Publication number | Publication date |
---|---|
FR2845099A1 (fr) | 2004-04-02 |
WO2004029358A3 (fr) | 2004-08-05 |
DK1552057T3 (da) | 2007-03-05 |
US20060234013A1 (en) | 2006-10-19 |
HK1082778A1 (en) | 2006-06-16 |
DE60309601T2 (de) | 2007-09-13 |
AU2003283481A1 (en) | 2004-04-19 |
AU2003283481A8 (en) | 2004-04-19 |
PT1552057E (pt) | 2007-02-28 |
DE60309601D1 (de) | 2006-12-21 |
FR2845099B1 (fr) | 2005-02-11 |
ES2277128T3 (es) | 2007-07-01 |
EP1552057B1 (fr) | 2006-11-08 |
WO2004029358A2 (fr) | 2004-04-08 |
ATE344849T1 (de) | 2006-11-15 |
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