EP1533417B1 - Method to produce metallic paper and metallic paper produced by said method - Google Patents
Method to produce metallic paper and metallic paper produced by said method Download PDFInfo
- Publication number
- EP1533417B1 EP1533417B1 EP04105659A EP04105659A EP1533417B1 EP 1533417 B1 EP1533417 B1 EP 1533417B1 EP 04105659 A EP04105659 A EP 04105659A EP 04105659 A EP04105659 A EP 04105659A EP 1533417 B1 EP1533417 B1 EP 1533417B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- water
- metal
- strip
- cellulose
- 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.)
- Revoked
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Images
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
- D21H19/02—Metal coatings
- D21H19/08—Metal coatings applied as vapour, e.g. in vacuum
-
- 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
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained 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
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
-
- 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
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
-
- 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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
-
- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
- D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
- D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender
Abstract
Description
- The present invention concerns a method to produce metallic paper, and the metallic paper produced using said method.
- The metallic paper according to the present invention can be used to make sheets, envelopes, wrappers, bags, containers, paper cornets, wrappings, packages or other, preferably but not exclusively suitable to contain and preserve foodstuffs.
- A method is known for the production of an aluminum or aluminized paper for envelopes for use for foodstuffs, by means of which a coat of metal oxides, kaolin and earth is applied on a cellulose strip, possibly smoothed and polished on one side, in order to form a first layer that closes the pores of the cellulose. Subsequently, on the coated cellulose strip a solvent paint is applied, that is, a paint containing chemical solvent, on which the aluminum is then applied.
- To be more exact, the aluminum is applied directly onto the layer of solvent paint by means of vacuum sublimation and a sufficiently high quantity thereof is deposited to ensure that the layer of solvent paint is fixed and completely covered.
- Another layer of solvent paint is finally deposited on the layer of aluminum, which protects the metal layer and prevents it from oxidizing in the air. On the last layer of solvent paint logos and writings are printed, by means of inks and paints, also containing solvent, in order to decorate or personalize the paper.
- This known method has the disadvantage, however, that it produces a metallic paper in which some of the toxic products used to produce it (e.g. solvents, metal oxides -) remain in any case.
- Moreover, according to current legislation, in order to apply the solvent paint, the strip of paper has to be transferred to a working site that is separate from that where the paper is produced, in order to prevent the solvent from dispersing and polluting the paper.
- Another disadvantage of the known method is that using a coat greatly conditions the basic characteristics of the paper used for metallization.
- Some metallized papers and methods for the production thereof are known from
US-A-4,567,098 ;WO-A-00/77300 US-A-6,066,375 ;EP-A-0812701 ;WO-A-00/24967 GB-A-2053283 EP-0715020 ;US-A-5,562,994 . However, all the known metallized papers and related production methods have the above mentioned disadvantages. - Purpose of the present invention is to perfect a method that does not require the use of toxic products, such as solvents or metal oxides, so that there is no risk of them remaining in the finished product, and so that it is not necessary to transfer the cellulose sheet to an autonomous working site other than where the basic paper is produced, as happens, on the contrary, when toxic products are used.
- Another purpose of the present invention is to perfect a method that allows to obtain a metallic paper which has a very limited metal content, so that the incidence of the latter is as low as possible, so that the metallic paper itself can be completely burnt and then disposed of together with ordinary paper.
- Another purpose of the present invention is to perfect a method to produce metallic paper which, apart from having a great resistance to load, is also light, that is, it has a weight in grams little more than that of the cellulose strip, and that it is easily crumpled.
- Applicant has devised, tested and embodied the present invention to obtain these and other purposes, to overcome the shortcomings of the state of the art and to obtain significant advantages.
- The present invention is set forth and characterized in
claims 1, 9 and 15, while the dependent claims describe other characteristics of the invention or variants to the main inventive idea. - In accordance with said purposes, a method according to the present invention to produce metallic paper comprises in sequence: a first step during which a first layer of an impregnating material is applied on a cellulose-based sheet or strip; a second step during which a second layer of a water paint is deposited on the first layer; and a third step during which a third layer of metal is deposited on the second layer and anchors stably on the water paint.
- The metal that forms the third layer interacts with the water paint and is stably integrated therewith in the zone of contact, so that it is not necessary that the layer of metal be protected and covered by any other layer of additional protection.
- The water paint that constitutes the second layer is advantageously an acrylic paint, soluble in water.
- Water inks and paints, which are without solvents or toxic products, can then be printed directly on the layer of metal in order to make logos or writings.
- In a preferential embodiment, the impregnating material too is a water-soluble acrylic paint.
- By means of the method according to the invention we thus obtain a metallic paper which is completely without toxic products.
- Using a water paint also has the advantage that it prevents the dispersion of toxic solvents into the working environment, and does not necessarily require, during the processing, that the metallic paper be transferred to an autonomous site for the application of the paint onto the first layer, although this can always be done for reasons connected to production.
- Another advantage of using water paint is that the layer of metal applied can have a very limited thickness, in the range of about 150-200Å (1.5-2.0 nanometers), while still ensuring a complete cover of the water paint below.
- In this way we obtain a metallic paper with a high load resistance, wherein the quantity of metal present is less than 0.05 g/m2, so that, in a paper of 48 g/m2, the ratio of weight between the metal and the paper is about 0.9 kg of metal for 1,000 kg of metallic paper in all.
- Thanks to this limited quantity of metal, the metallic paper according to the present invention can therefore be completely burned. Moreover, thanks to the fact that no coat is applied, the paper can have different weights from several tens of g/m2 to more than one hundred g/m2, for example from about 20 to about 150 g/m2.
- Since we are not limited by the presence of a coat in the second layer, it is possible to use a cellulose sheet or strip with very different characteristics, according to the type of metallic paper that is to be obtained.
- Moreover, thanks to the use of the impregnating substance instead of the coat, the second step to apply the water paint can advantageously be carried out immediately after the first step.
- In the event that the metallic paper made with the method according to the invention has to be used to make up fatty or oily elements, such as butter, margarine, fresh cheese, or other, a processing step is also advantageously provided at the end of the aforesaid third step, to process at least the third layer of metal with a substance able to make the paper proof against fatty and oily substances.
- According to a variant, it is provided that, on one and/or the other external surface of the metallic paper according to the invention, other layers of plastic material such as polyethylene are arranged, for example with anti-adhering and/or reinforcing functions.
- These and other characteristics of the present invention will become apparent from the following description of a preferential form of embodiment, given as a non-restrictive example, with reference to the attached drawings wherein:
-
fig. 1 is a lateral view, on an enlarged scale, of a portion of a sheet of metallic paper obtained by means of the method according to the present invention; -
fig. 2 shows schematically a first part of a plant for the production of the sheet of metallic paper shown infig. 1 ; -
fig. 3 shows a second part of the plant infig. 2 , consecutive to the first part shown infig. 2 ; -
fig. 4 shows a third part of the plant infig. 2 , consecutive to the second part shown infig. 3 . - With reference to
fig. 1 , ametallic paper 10 according to the present invention is produced in a processing plant 12 (figs. 2 to 4 ) which comprises a plurality of stations, substantially of a known type, which are arranged sequentially to each other. - A
first station 14 of the processing plant 12 (fig. 2 ) comprises acontainer 16, containing a wet cellulose mix, a conveyor belt 17 onto which the cellulose mix is poured, and acontrasting roller 19. - In this way we obtain, in a known manner, a cellulose-based
strip 21, of the desired thickness. - The
strip 21 defines the base layer of the metallic paper 10 (fig. 1 ). - From the first station 14 (
fig. 2 ), thestrip 21 is wound onto a drying andpolishing roller 23 of a known type, which makes thestrip 21 smoother and shinier on afirst side 25, or front side (fig. 1 ). The polishing is controlled, downstream of theroller 23, by means ofcontrol members 27, such as for example optical type detectors. - Subsequently, the
strip 21 is made to transit in asecond station 29, comprising afirst calender 31, by means of which a layer of impregnating material 33 is applied (fig. 1 ) on thefirst side 25 of thestrip 21. The impregnating material 33 advantageously consists of a water-soluble acrylic paint, such as for example product 1334 marketed by the Company SUN CHEMICALS. The impregnating material 33 forms a first layer of themetallic paper 10. - In a third station 35 (
fig. 3 ), thestrip 21, already provided with the impregnating material 33, is made to transit first in a circuit of compressedair 37 and then in adrier 39 with infrared rays where, apart from drying, the humidity of thestrip 21 is also continuously controlled. - Subsequently, by means of a
guide roller 41, thestrip 21 is made to transit in afourth station 43, comprising asecond calender 45 by means of which a second layer is applied, consisting of a paint 47 (fig. 1 ). According to the invention, the paint used is a water paint, such as for example product 1034 marketed by the Company SUN CHEMICALS. - As a consequence of using the
water paint 47 instead of a paint with solvents as in the state of the art, thewhole processing plant 12 can be installed in the same site, and without particular problems, since the working environment is in no way polluted by organic solvents. - Subsequently, the
strip 21, already provided with the twolayers 33 and 47, is inspected along its travel byother control members 49 in order to verify the humidity, structure and possible imperfections thereof, and is again dried on adrier roller 51. - The
strip 21 is then transferred to afifth station 53, optionally comprising athird calender 55, by means of which it is conditioned on itssecond side 57, or back (fig. 1 ) by applying water and starch so as to prevent themetallic paper 10 from subsequently curling. - After conditioning, the
strip 21 is further dried in asixth station 59 and then transferred to a seventh station 61 (fig. 4 ), where it is pressed with a pressure of about 300-400 kg/cm2 by means of a pair ofcalendars 63, at a temperature of about 70-80°C. Thestrip 21 with the two layers of impregnating material 33 and respectively ofwater paint 47 is thus flattened and homogenized, so that it is ready for metalization. - Subsequently, after a final control by means of a
relative member 65, thestrip 21 is wound onto aroller 67. The latter is transferred to aneighth station 69 where metalization is carried out by applying a layer ofmetal 70 onto the layer of paint 47 (fig. 1 ). - For example, a layer of aluminium, copper or other material is applied.
- The
station 69 is of a substantially known type and comprises a chamber kept under vacuum, inside which asublimation unit 72 is arranged, provided with one or more rolls 73 of wires of aluminium or of the metal that is to be used. - The
strip 21 is guided inside the vacuum chamber so that the layer ofpaint 47 is facing towards thesublimation unit 72. The latter heats the wire of aluminium, or of other metal, to high temperatures, so as to vaporize it directly on the layer ofwater paint 47. Thanks to the characteristics of the layer ofwater paint 47, the aluminium or other metal is fixed to the water paint itself, interacting and stably integrating therewith in the zone of contact. - After metalization, the strip of
metallic paper 10 is rewound onto aroller 75 and is ready to be printed directly on themetal layer 70 without having to apply any additional protective layer provided with anti-oxidant substances. - Subsequently, the
metal layer 70 is printed by means of water printing, in a relative printing station not shown in the drawings. - It is clear, however, that modifications and/or additions of steps may be made to the method to produce
metallic paper 10 as described heretofore, without departing from the field and scope of the present invention. - It is also clear that, although the present invention has been described with reference to specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of method to produce
metallic paper 10, all of which shall come within the field and scope of the present invention.
Claims (15)
- Method to produce metallic paper, characterized in that it comprises, in sequence:- a first step during which a first layer (33) of a first water-soluble acrylic paint is applied on a cellulose-based sheet or strip (21) by means of a first calendering operation;- a second step during which a second layer (47) of a second water-soluble acrylic paint, different from said first water-soluble acrylic paint, is deposited on said first layer (33) by means of a second calendering operation; and- a third step wherein a third layer of metal (70) of a thickness of about 150-200Å is directly deposited on said second layer (47), so that said metal interacts with said second water-soluble paint, is stably anchored thereto, is stably integrated therewith in the zone of contact and the quantity of metal present is less than 0.05 g/m2,- wherein after said first step and before said second water-soluble acrylic paint is applied, said cellulose-based sheet or strip (21) impregnated with the first water-soluble acrylic paint is dried by means of compressed air (37) and/or infrared rays (39) and the humidity of the cellulose-based sheet or strip (21) is also continuously controlled.
- Method as in any claim hereinbefore, characterized in that during said third step said metal is fixed on said second layer (47) by means of vacuum sublimation.
- Method as in any claim hereinbefore, characterized in that aluminum or copper is used as the metal.
- Method as in any claim hereinbefore, wherein said first layer (33) of first water-soluble acrylic paint is applied on a first side (25) of said cellulose-based sheet or strip (21), characterized in that it comprises a fourth step, between said second step and said third step, during which said cellulose-based strip (21) is conditioned on its second side (57) by means of an application of water or starch.
- Method as in claim 4, characterized in that it comprises a fifth step between said fourth step and said third step, during which said cellulose-based sheet or strip (21) with said first layer (33) and said second layer (47) is pressed and homogenized.
- Method as in any claim hereinbefore, characterized in that it comprises a sixth step subsequent to said third step during which a water ink or a water-soluble paint is directly printed on said third layer of metal (70).
- Method as in any claim hereinbefore, characterized in that it comprises, at the end of said third step, a processing step to process at least said third layer of metal (70) with a substance able to make said metallic paper proof against fatty and oily substances.
- Method as in any claim hereinbefore, characterized in that it also comprises a coating step wherein on one and/or the other external surface of said metallic paper at least another layer of plastic material is arranged.
- Metallic paper comprising a cellulose-based sheet or strip (21), characterized in that it comprises:- a first layer (33) of a first water-soluble acrylic paint arranged on a first side of said cellulose-based sheet or strip (21) wherein said cellulose-based sheet or strip (21) impregnated with the first water-soluble acrylic paint is dried by means of compressed air (37) and/or infrared rays (39);- a second layer (47) of a second water-soluble acrylic paint, different form said first water-soluble acrylic paint, which is applied on said first layer (33), wherein said first layer (33) and said second layer (47) are applied in corresponding calendering operations, and- a third layer of metal (70) of a thickness of about 150-200Å, which is directly deposited on said second layer (47) of water-soluble acrylic paint, said metal interacting with said water-soluble paint, being stably anchored thereto and being stably integrated therewith in the zone of contact, so that the quantity of metal present is less than 0.05 g/m2.
- Metallic paper as in claim 9, characterized in that said metal is either aluminum or copper.
- Metallic paper as in claim 9 or 10, characterized in that it has a weight that varies from about 20 g/m2 to about 150 g/m2.
- Metallic paper as in claim 9 or 11, characterized in that it comprises a water print of a logo or a writing, arranged directly on said layer of metal (70).
- Metallic paper as in any claim hereinbefore from 9 to 12 inclusive, characterized in that, at least on said third layer of metal (70), it comprises a substance able to make it proof against fatty and oily substances.
- Metallic paper as in any claim hereinbefore from 9 to 13, characterized in that, on one and/or the other external surface thereof, it comprises at least another layer of plastic material.
- A plant to produce metallic paper, characterized in that it comprises, in sequence:- a first calender (31) by means of which a first layer (33) of a first water-soluble acrylic paint is applied on a cellulose-based sheet or strip (21);- drying means comprising a circuit of compressed air (37) and a drier with infrared rays (39) by means of which said cellulose-based sheet or strip (21) impregnated with the first water-soluble acrylic paint is dried and the humidity of the cellulose-based sheet or strip (21) is also continuously controlled;- a second calender (45) by means of which a second layer (47) of a second water-soluble acrylic paint, different form said first water-soluble acrylic paint, is deposited on said first layer (33;- a station (69) by means of which a third layer of metal (70) of a thickness of about 150-200Å is directly deposited on said second layer (47), so that the quantity of metal present in said metallic paper is less than 0.05 g/m2.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000221A ITUD20030221A1 (en) | 2003-11-11 | 2003-11-11 | PROCEDURE FOR THE PRODUCTION OF METALLIC PAPER AND METALLIC PAPER PRODUCED BY SUCH PROCEDURE. |
ITUD20030221 | 2003-11-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1533417A1 EP1533417A1 (en) | 2005-05-25 |
EP1533417B1 true EP1533417B1 (en) | 2011-08-24 |
Family
ID=34430827
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04105659A Revoked EP1533417B1 (en) | 2003-11-11 | 2004-11-10 | Method to produce metallic paper and metallic paper produced by said method |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1533417B1 (en) |
AT (1) | ATE521757T1 (en) |
ES (1) | ES2372279T3 (en) |
IT (1) | ITUD20030221A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201700033470A1 (en) * | 2017-03-27 | 2018-09-27 | Adercarta S P A | ANTIBACTERIAL FOOD PACKAGE |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU535806B1 (en) * | 1979-06-29 | 1984-04-05 | Mitsui Petrochemical Industries, Ltd. | Metallised paper |
DE3225658C1 (en) * | 1982-07-09 | 1984-01-05 | Zanders Feinpapiere AG, 5060 Bergisch Gladbach | Metallized paper and process for making and using same |
US5562994A (en) * | 1994-09-21 | 1996-10-08 | Kimberly-Clark Corporation | Un-coated paper-making sludge substrate for metallizing |
DE9419333U1 (en) * | 1994-12-02 | 1995-01-26 | Lefatex Chemie Gmbh | Coating agents for paper surfaces |
DE69700061T2 (en) * | 1996-06-10 | 1999-10-21 | Dainippon Printing Co Ltd | Thermal transfer layer for creating images with a metallic sheen |
US6066375A (en) * | 1997-04-10 | 2000-05-23 | Fort James Corporation | Coated paperboard and paperboard containers having a microwave interactive layer which emits none or very low amounts of benzene in microwave applications |
GB9823499D0 (en) | 1998-10-27 | 1998-12-23 | Proman Chem Ltd | Barrier coatings |
WO2000077300A1 (en) | 1999-06-16 | 2000-12-21 | Vacumet Corp. | Metallized paper with grease resistance |
-
2003
- 2003-11-11 IT IT000221A patent/ITUD20030221A1/en unknown
-
2004
- 2004-11-10 ES ES04105659T patent/ES2372279T3/en active Active
- 2004-11-10 EP EP04105659A patent/EP1533417B1/en not_active Revoked
- 2004-11-10 AT AT04105659T patent/ATE521757T1/en active
Also Published As
Publication number | Publication date |
---|---|
EP1533417A1 (en) | 2005-05-25 |
ITUD20030221A1 (en) | 2005-05-12 |
ES2372279T3 (en) | 2012-01-18 |
ATE521757T1 (en) | 2011-09-15 |
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