Abstract
The invention relates to a process including, as steps a) provision of a sheetlike composite (200) including, as mutually superposed layers, from an external surface (201) of the sheetlike composite to an internal surface (202) of the sheetlike composite, i) a carrier layer, ii) a barrier layer, and iii) a polymeric internal layer, wherein the sheetlike composite (200) has a first electrical charge; b) provision of a first component (300) including a first component surface (301), wherein the first component surface (301) includes a plurality of recesses (302), wherein the recesses (302) include a composition (303) including a colourant, wherein the first component (300) moves in a first direction (304), wherein the first component (300) has a further electrical charge; c) increase of the absolute magnitude of the difference between the first electrical charge and the further electrical charge; and d) bringing the external surface (201) of the sheetlike composite into contact with the first component surface (301). The invention further relates to a printed sheetlike composite; to a container precursor, and also to a container, in each case including the printed sheetlike composite; to a device (500) for the printing of a sheetlike composite; and to a use of the device for the printing of a sheetlike composite.
Claims
1. A process including, as steps, a) provision of a sheetlike composite including, as mutually superposed layers, from an external surface of the sheetlike composite to an internal surface of the sheetlike composite, i) a carrier layer, ii) a barrier layer, and iii) a polymeric internal layer, wherein the sheetlike composite has a first electrical charge; b) provision of a first component including a first component surface, wherein the first component surface includes a plurality of recesses, wherein the recesses include a composition including a colourant, wherein the first component moves in a first direction, wherein the first component has a further electrical charge; c) increase of the absolute magnitude of the difference between the first electrical charge and the further electrical charge; and d) bringing the external surface of the sheet like composite into contact with the first component surface.
2. The process according to claim 1, wherein the process further includes a step of e) reduction of the absolute magnitude of the difference between the first electrical charge and the further electrical charge downstream of the step d) (104).
3. The process according to claim 1, wherein the barrier layer is electrically insulating.
4. The process according to claim 1, wherein the increase in step c) is achieved via application of electrical charge carriers from an electrode onto the external surface of the sheetlike composite.
5. The process according to claim 1, wherein the barrier layer is electrically conductive.
6. The process according to claim 1, wherein the sheetlike composite is characterized by an ignition residue in the range from 0.1 to 75 mg.
7. The process according to claim 1, wherein the sheetlike composite further includes a polymeric external layer on one side of the carrier layer, wherein the said side faces towards the external surface, wherein a layer thickness of the polymeric external layer is in the range from 1 to 20.Math..
8. The process according to claim 1, wherein the sheetlike composite is superimposed by a colour layer on the external surface in step d), wherein the colour layer is characterized by a number of absent matrix dots in the range from 0 to 100 per 100 mm.sup.2.
9. A printed sheet like composite obtainable via the process according to claim 1.
10. A device including, as device constituents, a) a sheetlike composite including, as mutually superposed layers, from an external surface of the sheetlike composite to an internal surface of the sheetlike composite, i) a carrier layer, ii) a barrier layer, and iii) a polymeric internal layer; b) an electrode arranged and designed for the transfer of electrical charge carriers onto the external surface of the sheet composite; and c) a first component including a first component surface, wherein the first component surface includes a plurality of recesses, wherein the recesses include a composition including a colourant, wherein the first component surface has been brought into contact with the external surface of the sheet composite.
11. The device according to claim 10, wherein the device includes a further electrode downstream of the first component, wherein the further electrode is arranged and designed for acceptance of electrical charge carriers from the external surface of the sheetlike composite.
12. A printed sheet like composite including, as mutually superposed layers, from an external surface of the printed sheetlike composite to an internal surface of the printed sheetlike composite, i) a colour layer, ii) a carrier layer, iii) a barrier layer, and iv) a polymeric internal layer, wherein the printed sheetlike composite is characterized by an ignition residue in the range from 0.1 to 75 mg.
13. The printed sheetlike composite according to claim 12, wherein the sheetlike composite further includes a polymeric external layer between the colour layer and the carrier layer, wherein the polymeric external layer is characterized by a layer thickness in the range from 1 to 20.Math..
14. A container precursor at least to some extent including the printed sheetlike composite according to claim 9.
15. A closed container at least to some extent including the printed sheet like composite according to claim 9, wherein the printed sheetlike composite (400) has been folded at least once.
16. A use of the device according to claim 10 for printing of the sheetlike composite.
Description
[0180] In the drawings:
[0181] FIG. 1 is a diagram of the sequence of the process of the invention;
[0182] FIG. 2a) is a diagrammatic cross section through a sheetlike composite of the invention;
[0183] FIG. 2b) is a diagrammatic cross section through another sheetlike composite of the invention;
[0184] FIG. 3 is a diagrammatic cross section through a first component of the invention;
[0185] FIG. 4a) is a diagrammatic cross section through a printed sheetlike composite of the invention;
[0186] FIG. 4b) is a diagrammatic cross section through another printed sheetlike composite of the invention;
[0187] FIG. 5 is a diagrammatic view of a device of the invention;
[0188] FIG. 6 is a diagrammatic view of a container precursor of the invention;
[0189] FIG. 7 is a diagrammatic view of a closed container of the invention;
[0190] FIG. 8 is a diagrammatic detail of an enlarged plan view of a printed sheetlike composite of the invention; and
[0191] FIG. 9 is a diagrammatic detail of an enlarged plan view of a printed sheetlike composite not of the invention.
[0192] FIG. 1 is a diagram of the sequence of the process 100 of the invention. The sheetlike composite 200 according to FIG. 2 is provided in a step a) 101 of the process 100. This sheetlike composite has a first electrical charge. This means that the sheetlike composite in its entirety has an entire charge which is the first electrical charge. In step a) 101 it is preferable that the sheetlike composite is electrically neutral. A first component 300 according to FIG. 3 is provided in a step b) 102 of the process 100 of the invention. The first component 300 moves in a first direction 304. The first component 300 here is an intaglio printing cylinder which rotates in a first direction 304 which is a first direction of rotation. The intaglio printing cylinder has a further electrical charge. It is electrically neutral and earthed. In a step c) 103 the absolute magnitude of the difference between the first electrical charge and the further electrical charge is increased. This occurs via negative electrical charging of the sheetlike composite. To this end, electrons are applied by means of an electrode 502 onto the external surface 201 of the sheetlike composite 200. In a step d) 104 the external surface 201 of the sheetlike composite 200 is brought into contact with the first component surface 301. To this end, the sheetlike composite 200 is forced against the intaglio printing cylinder by means of a further component 501, an impression roll, which is not earthed. The impression roll here rotates in a further direction 503 which is a further direction of rotation. The first direction of rotation is opposite to the further direction of rotation. The process 100 can in particular be implemented by using the device 500 according to FIG. 5.
[0193] FIG. 2a) is a diagrammatic cross section through a sheetlike composite 200 of the invention. The sheetlike composite 200 consists of the following layers mutually superposed in this sequence from an external surface 201 of the sheetlike composite 200 to an internal surface 202 of the sheetlike composite 200: a carrier layer 203 made of paperboard, an LDPE layer 204, an adhesion-promoter layer 205, a barrier layer 206 made of aluminium, an EAA layer 207, and a polymeric internal layer 208. The polymeric internal layer 208 here consists of a polymer blend which includes 80% by weight of an mPE and 20% by weight of an LDPE, based in each case on the total weight of the polymer blend. The external surface 201 here is a surface which belongs to the carrier layer 203 and which faces away from the barrier layer 206. The external surface 201 is moreover that surface of the sheetlike composite 200 that faces outwards in a food container produced from the sheetlike composite 200. The internal surface 202 is that surface of the sheetlike composite 200 that faces inwards in a food container produced from the sheetlike composite 200, and accordingly is in contact with the food therein. The sheetlike composite 200 depicted in FIG. 2a) can in particular be printed with a decor according to the process 100 of FIG. 1 or with the aid of the device 500 of FIG. 5, or both.
[0194] FIG. 2b) is a diagrammatic cross section through another sheetlike composite 200 of the invention. The sheetlike composite 200 of FIG. 2b) is the sheetlike composite of FIG. 2a), except that in FIG. 2b) a polymeric external layer 209 made of polyethylene has been superposed onto the carrier layer 203, and the external surface 201 is therefore a surface of the polymeric external layer 209.
[0195] FIG. 3 is a diagrammatic cross section through a first component 300 of the invention. The first component 300 includes a first component surface 301, including a plurality of recesses 302. The first component 300 is an intaglio printing cylinder, and the first component surface 301 is a cylinder jacket surface of the intaglio printing cylinder. The recesses 302 are cells. The cells respectively include a composition 303. This is depicted in FIG. 3 in that the larger broken-line circle on the right-hand side of FIG. 3 is an enlarged view of the cell in the smaller broken-line circle on the left-hand side of FIG. 3. The composition 303 is a printing ink including a colourant. The colourant is a pigment. The intaglio printing cylinder moves in a first direction 304 in that it rotates in a first direction of rotation.
[0196] FIG. 4a) is a diagrammatic cross section through a printed sheetlike composite 400 of the invention. The printed sheetlike composite 400 consists of the following layers mutually superposed in this sequence from an external surface 201 of the printed sheetlike composite 400 to an internal surface 202 of the printed sheetlike composite 400: a colour layer 401; a carrier layer 203 made of paperboard, an LDPE layer 204, an adhesion-promoter layer 205, a barrier layer 206 made of aluminium, an EAA layer 207, and a polymeric internal layer 208. The polymeric internal layer 208 here consists of a polymer blend which includes 80% by weight of an mPE and 20% by weight of an LDPE, based in each case on the total weight of the polymer blend. The colour layer 401 includes a first colour layer region 402 and a further colour layer region 403. The first colour layer region 402 adjoins the further colour layer region 403. The first colour layer region is characterized by an area coverage of 80%. The further colour layer region is characterized by an area coverage of 5% of the same colour. The colour layer 401 is a decor of the printed sheetlike composite 400. This decor has improved area coverage contrast in relation to the abovementioned colour. The external surface 201 is a surface which belongs to the colour layer 401 and which faces away from the carrier layer 203. The external surface 201 is moreover that surface of the printed sheetlike composite 400 that faces outwards in a food container produced from the printed sheetlike composite 400. The internal surface 202 is that surface of the printed sheetlike composite 400 that faces inwards in a food container produced from the printed sheetlike composite 400, and accordingly is in contact with the food therein. The printed sheetlike composite 400 is in particular obtainable via printing of the sheetlike composite 200 of FIG. 2 according to the process 100 of FIG. 1 or with the aid of the device in FIG. 5, or both.
[0197] FIG. 4b) is a diagrammatic cross section through another printed sheetlike composite 400 of the invention. The printed sheetlike composite 400 of FIG. 4b) is the sheet of FIG. 4a), except that in FIG. 4b) there is a polymeric external layer 409 made of polyethylene located between the colour layer 401 and the carrier layer 203. The colour layer 401 has been printed onto the polymeric external layer 209.
[0198] FIG. 5 is a diagrammatic view of a device 500 of the invention. The device 500 is suitable for the printing of the sheetlike composite 200 of FIG. 2 with a decor by means of an intaglio printing process. In particular, the device 500 has been designed for the implementation of the process 100 of FIG. 1. The device 500 includes a sheetlike composite 200 of FIG. 2. The device 500 moreover includes a first component 300 which is an intaglio printing cylinder of FIG. 3. The intaglio printing cylinder here has been earthed by means of the earth 504. To this end it is in particular possible that a shaft which functions as axis of rotation of the intaglio printing cylinder is earthed. The intaglio printing cylinder moves in a first direction 304 in that the intaglio printing cylinder rotates in a first direction of rotation. The device 500 further includes a further component 501 which is a impression roll. The impression roll moves in a further direction 502 in that the impression roll rotates in a further direction of rotation. The further direction of rotation is opposite to the first direction of rotation. The impression roll is not earthed. The impression roll guides the sheetlike composite 200 in such a way that the external surface 201 of the sheetlike composite is forced onto the first component surface 301 with the recesses 302. The sheetlike composite 200 here is guided through a gap between the impression roll and the intaglio printing roll, and is thus printed. The device 500 further includes an electrode 502 arranged and designed in such a way that it applies electrons to the external surface 201 of the sheetlike composite 200. The situation applying to each subregion of the external surface 201 here is that electrons are first applied from the electrode 502 onto the subregion, and then the subregion is printed via contact with the intaglio printing roll. The sheetlike composite 200 has thus been negatively electrically charged, while the intaglio printing cylinder and the composition 303, which is a printing ink, are electrically neutral. Accordingly there are electrostatic attraction forces existing between the printing ink and the external surface 201 of the sheetlike composite 200. As shown in the enlarged region on the right-hand side in FIG. 5, the printing ink in the cells includes a convex surface, i.e. a surface curved outwards. Downstream of the intaglio printing roll and of the impression roll the device 500 includes an earth 504 which earths the sheetlike composite 200 after the printing procedure described above, and thus further reduces the electrical charge of the said sheet.
[0199] FIG. 6 is a diagrammatic view of a container precursor 600 of the invention. The container precursor 600 shown here is a jacket. The jacket includes a top region 602 and a base region 603. The top region 602 and the base region 603 respectively include crease lines 604. The top region 602 and the base region 603 can respectively be sealed by folding along the creases 604 and sealing, and a closed container 700 of FIG. 7 can thus be obtained from the jacket. Accordingly the container precursor 600 is a precursor produced in the process for producing the closed container 700. The container precursor 600 here includes a cut-to-size section of the sheetlike composite 400 of FIG. 4. In the container precursor 600 the sheetlike composite 400 has been folded; here it includes 4 folds 601. The jacket moreover includes a longitudinal seam 605 along which end regions of the sheetlike composite 400 have been sealed to one another.
[0200] FIG. 7 is a diagrammatic view of a closed container 700 of the invention. The closed container 700 can be obtained via folding of the container precursor 600 of FIG. 6 along the creases 604 and sealing of folded regions to seal the top region 602 and the base region 603. Accordingly the closed container 700 includes a cut-to-size section of the sheetlike composite 400 of FIG. 4. The closed container further includes at least 8 folds 601. The closed container 700 surrounds an internal space which includes a food 701. The food can be liquid, but can also include solid constituents. The closed container 700 shown in FIG. 7 is of one-piece design. The closed container can moreover be provided with a fitment to improve ease of opening. This is in particular the case when the carrier layer 203 of the sheetlike composite 400 has a hole.
[0201] FIG. 8 is a diagrammatic detail of an enlarged plan view of a colour layer 401 of a printed sheetlike composite 400 of the invention. The colour layer 401 has been obtained via printing by using the device 500 of FIG. 5, and consists of printed matrix dots 801. The printed sheetlike composite 400 consists of the following layers mutually superposed in this sequence from an external surface 201 of the printed sheetlike composite 400 to an internal surface 202 of the printed sheetlike composite 400: the colour layer 401, a polymeric external layer 209 made of LDPE Novex M19N430 from Ineos Kln GmbH; a single paper-coating layer which can be obtained via coating with a liquid formulation comprising 100 parts of pigment (Hydrocarb 60; Omya Inc; Cincinnati, US) and 20 parts of binder/SB Latex (MAINCOTE HG-56; Dow; Germany); a carrier layer 203 made of NaturaD UC 200 mN, Stora Enso AB, Stockholm, Sweden; an LDPE layer 204 made of LPDE Novex M19N430 from Ineos Kln GmbH; a barrier layer 206 made of aluminium EN A W 8079 from Hydro Aluminium Deutschland GmbH of thickness 6 m; and a polymeric internal layer 208 made of a PE blend including 30% by weight of an mLDPE and 70% by weight of an LDPE, based in each case on the total weight of the polymeric internal layer 208, with weight per unit area 22 g/m.sup.2. The colour layer 401 consists of a printed image obtained in the intaglio printing process, characterized by a matrix with 60 matrix dots per cm and area coverage 30%. The printed sheetlike composite 400 is further characterized by a layer thickness of 11 m for the polymeric external layer 209 and an ignition residue of 30 mg according to the above test method. The colour layer 401 shown is further characterized by a number of 7 absent matrix dots 902 per 100 mm.sup.2.
[0202] FIG. 9 is a diagrammatic detail of an enlarged plan view of a printed image 901 of a printed sheetlike composite 900 not of the invention. The printed image 901 was obtained via printing using the device 500 of FIG. 5, but with no use of the electrode 502 to charge the sheetlike composite 200. The printed image 901 was therefore not obtained according to the process 100 of the invention. The printed image 901 consists of printed matrix dots 801. The printed sheetlike composite 900 consists of the following layers mutually superposed in this sequence: the printed image 901; a polymeric external layer 209 made of LDPE Novex M19N430 from Ineos Kln GmbH; a single paper-coating layer which can be obtained via coating with liquid formulation comprising 100 parts of pigment (Hydrocarb 60; Omya Inc; Cincinnati, US) and 20 parts of binder/SB Latex (MAINCOTE HG-56; Dow; Germany); a carrier layer 203 made of NaturaD UC 200 mN, Stora Enso AB, Stockholm, Sweden; an LDPE layer 204 made of LDPE Novex M19N430 from Ineos Kln GmbH; a barrier layer 206 made of aluminium EN A W 8079 from Hydro Aluminium Deutschland GmbH of thickness 6 m; and a polymeric internal layer 208 made of a PE blend including 30% by weight of an mLDPE and 70% by weight of an LDPE, based in each case on the total weight of the polymeric internal layer 208, with weight per unit area 22 g/m.sup.2. The printed image 901 is characterized by a matrix with 60 matrix dots per cm and with area coverage 30%. The printed sheetlike composite 900 is further characterized by a layer thickness of 11 m of the polymeric external layer 209 and an ignition residue of 30 mg according to the above test method. The printed image 901 shown is further characterized by a number of 45 absent matrix dots 902 per 100 mm.sup.2.
LIST OF REFERENCE NUMERALS
[0203] 100 Process of the invention [0204] 101 Step a) [0205] 102 Step b) [0206] 103 Step c) [0207] 104 Step d) [0208] 200 Sheetlike composite [0209] 201 External surface [0210] 202 Internal surface [0211] 203 Carrier layer [0212] 204 LDPE layer [0213] 205 Adhesion-promoter layer [0214] 206 Barrier layer [0215] 207 EAA layer [0216] 208 Polymeric internal layer [0217] 209 Polymeric external layer [0218] 300 First component [0219] 301 First component surface [0220] 302 Recess [0221] 303 Composition [0222] 304 First direction [0223] 400 Printed sheetlike composite of the invention [0224] 401 Colour layer [0225] 402 First colour layer region [0226] 403 Further colour layer region [0227] 500 Device of the invention [0228] 501 Further component [0229] 502 Electrode [0230] 503 Further direction [0231] 504 Earth [0232] 600 Container precursor of the invention [0233] 601 Fold [0234] 602 Top region [0235] 603 Base region [0236] 604 Crease [0237] 605 Longitudinal seam [0238] 700 Closed container of the invention [0239] 701 Food [0240] 801 Printed matrix dot [0241] 900 Printed sheetlike composite not of the invention [0242] 901 Printed image not obtained according to the invention [0243] 902 Absent matrix dot
