Abstract
The invention relates to a sheetlike composite comprising, as layers of a layer sequence in the direction from an outer face of the sheetlike composite to an inner face of the sheetlike composite, a) a first polymer layer, b) a carrier layer, and c) a barrier layer, wherein the first polymer layer is characterized by a ratio of a proportion of aromatic groups in the first polymer layer to a proportion of carbonyl groups in the first polymer layer in a range from 0.18 to 0.34. The invention further relates to processes for producing a sheetlike composite, a container precursor and a closed container and to the aforementioned process products; to a further container precursor; to a further closed container; and to uses of the sheetlike composite, of a hardener and of a printing ink.
Claims
1. A sheetlike composite comprising, as layers of a layer sequence in the direction from an outer face of the sheetlike composite to an inner face of the sheetlike composite, a) a first polymer layer, b) a carrier layer, and c) a barrier layer, wherein the first polymer layer is characterized by a ratio of a proportion of aromatic groups in the first polymer layer to a proportion of carbonyl groups in the first polymer layer in a range from 0.18 to 0.34.
2. The sheetlike composite according to claim 1, wherein the first polymer layer is further characterized by a ratio of a proportion of aliphatic groups in the first polymer layer to the proportion of carbonyl groups in the first polymer layer in a range from 0.40 to 0.60.
3. The sheetlike composite according to claim 1, wherein the first polymer layer further comprises a first colorant in a proportion in a range from 10 to 50% by weight, based on the weight of the first polymer layer.
4. A process comprising, as process steps, a) providing a sheetlike composite precursor comprising, as mutually superposing layers of a layer sequence, i) a carrier layer, and ii) a barrier layer; b) overlaying the carrier layer with a liquid first polymer layer precursor composition on a side facing away from the barrier layer, wherein the liquid first polymer layer precursor composition is characterized by a ratio of a proportion of aromatic groups in the liquid first polymer layer precursor composition to a proportion of aliphatic groups in the liquid first polymer layer precursor composition in a range from 0.30 to 0.80.
5. A sheetlike composite obtainable by the process according to claim 4.
6. A container precursor comprising the sheetlike composite according to claim 1.
7. A closed container comprising the sheetlike composite according to any of claim 1.
8. A process comprising, as process steps, a. providing the sheetlike composite according to claim 1, wherein the sheetlike composite further comprises a first longitudinal rim and a further longitudinal rim; b. folding the sheetlike composite; and c. contacting and joining the first longitudinal rim to the further longitudinal rim, thereby obtaining a longitudinal seam.
9. A container precursor obtainable by the process according to claim 8.
10. A process comprising, as process steps, A) providing the container precursor according to claim 6; B) forming a base region of the container precursor by folding the sheetlike composite; C) closing the base region; D) filling the container precursor with a food or drink product, and E) closing the container precursor in a top region, thereby obtaining a closed container.
11. A closed container obtainable by the process according to claim 10.
12. A use of the sheetlike composite according to claim 1 for production of a food or drink product container.
13. A use of a hardener, characterized by a ratio of a proportion of aromatic groups in the hardener to a proportion of aliphatic groups in the hardener in a range from 0.30 to 0.80, in a printing ink for printing of a sheetlike composite precursor comprising, as mutually superposing layers of a layer sequence, i) a carrier layer, and ii) a barrier layer.
14. A use of a printing ink, characterized by a ratio of a proportion of aromatic groups in the printing ink to a proportion of aliphatic groups in the printing ink in a range from 0.30 to 0.80, for printing of a sheetlike composite precursor comprising, as mutually superposing layers of a layer sequence, i) a carrier layer, and ii) a barrier layer.
Description
[0237] The figures show, in schematic form and not to scale, unless stated otherwise in the description or the respective figure:
[0238] FIG. 1 a schematic diagram of a section of a sheetlike composite according to the invention in cross section;
[0239] FIG. 2 a schematic diagram of a section of a further sheetlike composite according to the invention in cross section;
[0240] FIG. 3 a schematic diagram of a container precursor according to the invention;
[0241] FIG. 4 a schematic diagram of a closed container according to the invention;
[0242] FIG. 5 a flow diagram of a process according to the invention for printing a sheetlike composite precursor;
[0243] FIG. 6 a flow diagram of a further process according to the invention for printing a sheetlike composite precursor;
[0244] FIG. 7 a flow diagram of a process according to the invention for producing a container precursor;
[0245] FIG. 8 a flow diagram of a process according to the invention for producing a closed container; and
[0246] FIG. 9 a schematic diagram of a first printing form.
[0247] FIG. 1 shows a schematic diagram of a section of a sheetlike composite 100 according to the invention in cross section. The sheetlike composite 100 consists of the following layers of a layer sequence in the direction from an outer face 101 of the sheetlike composite 100 to an inner face 102 of the sheetlike composite 100: a first polymer layer 103, a carrier layer 104, an intermediate polymer layer 105 and a barrier layer 106. Here, the carrier layer 104 consists of a Stora Enso Natura T Duplex twice-coated cardboard (Scott bond 200 J/m.sup.2, residual moisture content 7.5%, basis weight 210 g/m.sup.2). The intermediate polymer layer 105 consists of LDPE 19N430 from Ineos GmbH, Cologne (basis weight 18 g/m.sup.2). The barrier layer 106 consists of an EN AW 8079 aluminium foil from Hydro Aluminium Deutschland GmbH (thickness 6 m). Moreover, the first polymer layer 103 comprises aromatic groups, aliphatic groups and carbonyl groups. A ratio of a proportion of the aromatic groups to a proportion of the carbonyl groups, in each case in the first polymer layer 103, is 0.25. A ratio of a proportion of the aliphatic groups to the proportion of the carbonyl groups, in each case in the first polymer layer 103, is 0.45. A ratio of the proportion of the aromatic groups to the proportion of the aliphatic groups is 0.53. The first polymer layer 103 here comprises a polyurethane having the aromatic and aliphatic groups. The polyurethane was obtained by a polyaddition of an aromatic polyisocyanate based on tolylene diisocyanate and an aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI of the biuret type) with trimethylolpropane and a polyester containing OH groups from adipic acid. In addition, the first polymer layer 103 comprises 30.9% by weight of TiO.sub.2 (rutile type), based on the weight of the first polymer layer 103. Moreover, the first polymer layer 103 comprises SiO.sub.2, polyvinyl chloride, cellulose acetate butyrate, polyadipate and polyolefin wax. In addition, the first polymer layer 103 is characterized by an L* value in the L*a*b* colour system of 89.6.
[0248] FIG. 2 shows a schematic diagram of a section of a further sheetlike composite 100 according to the invention in cross section. The sheetlike composite 100 consists of the following layers of a layer sequence in the direction from an outer face 101 of the sheetlike composite 100 to an inner face 102 of the sheetlike composite 100: a first polymer layer 103, a further polymer layer 203 of LDPE 19N430 from Ineos GmbH, Cologne (basis weight 15 g/m.sup.2); a carrier layer 104 of a Stora Enso Natura T Duplex twice-coated cardboard (Scott bond 200 J/m.sup.2, residual moisture content 7.5%, basis weight 210 g/m.sup.2); an intermediate polymer layer 105 of LDPE 19N430 from Ineos GmbH, Cologne (basis weight 18 g/m.sup.2); a barrier layer 106 of an EN AW 8079 aluminium foil from Hydro Aluminium Deutschland GmbH (thickness 6 m); an adhesion promoter layer 204 of Escor 6000 HSC from Exxon Mobil Corporation (basis weight 4 g/m.sup.2) and LDPE 19N430 from Ineos GmbH, Cologne (basis weight 22 g/m.sup.2); and an inner polymer layer 205 composed of a blend of 65% by weight of LDPE 19N430 from Ineos Kln GmbH and 35% by weight of Eltex 1315 AZ from Ineos Kln GmbH (blend basis weight 10 g/m.sup.2). Here, the details relating to the first polymer layer 103 in FIG. 1 also apply to the first polymer layer 103 in FIG. 2. In addition, the first polymer layer 103 has an area coverage of 100%, based on a surface of the carrier layer 104 adjoining the first polymer layer 103. Furthermore, the first polymer layer 103 is overlaid by a first colour application 201 on a side of the first polymer layer 103 that is facing away from the carrier layer 104. The first colour application 201 comprises, to an extent of 9.3% by weight, based on the weight of the first colour application 201, a Pigment Yellow PY 13 and also 9% by weight of PVB, based on the weight of the first colour application 201, as binder, and a polyurethane. In addition, the first colour application 201 has an area coverage of 20%, based on the surface of the carrier layer 104 adjoining the first polymer layer 103. A further colour application 202 similarly overlays the first polymer layer 103 on the side of the first polymer layer 103 that is facing away from the carrier layer 104. The further colour application 202 comprises, to an extent of 13.5% by weight, based on the weight of the further colour application 202, a Pigment Blue PB15:3 and also 6% by weight of PVB, based on the weight of the further colour application 202, as binder, and a polyurethane. In addition, the further colour application 202 has an area coverage of 10%, based on the surface of the carrier layer 104 adjoining the first polymer layer 103. The first colour application 201 and the further colour application 202 each consist of a multitude of printed halftone dots. Here, the first colour application 201 and the further colour application 202 form a colour decoration of the sheetlike composite 100. The first polymer layer 103 forms a white primer for the colour decoration. The first colour application 201, the further colour application 202 and the first polymer layer 103 have all been obtained by intaglio printing.
[0249] FIG. 3 shows a schematic diagram of a container precursor 300 according to the invention. The container precursor 300 comprises the sheetlike composite 100 of FIG. 2 with 4 longitudinal folds, each of which forms an edge (longitudinal edge) 301. The sheetlike composite 100 is a blank for production of a single closed container 400. The container precursor 300 is in the form of a shell and comprises a longitudinal seam 302 in which a first longitudinal rim and a further longitudinal rim of the sheetlike composite 100 are sealed to one another. In addition, the container precursor 300 comprises a hole 305 in the carrier layer 104. The hole 305 is covered by the further polymer layer 203 (not shown), the intermediate polymer layer 105 (not shown), the barrier layer 106, the adhesion promoter layer 204 (not shown) and the inner polymer layer 205 (not shown) as hole-covering layers. By folding along grooves 306 and joining of fold regions in a top region 303 and a base region 304 of the container precursor 300, a closed container 400 is obtainable. Such a closed container 400 is shown in FIG. 4.
[0250] FIG. 4 shows a schematic diagram of a closed container 400 according to the invention. The closed container 400 has been produced from the container precursor 300 according to FIG. 3. The closed container 400 comprises a food or drink product 401 and has 12 edges 301. In addition, the closed container 400 is connected to a lid comprising an opening aid 402, which lid covers the hole 305 on the outer face 101 of the sheetlike composite 100. Here, the lid 402 comprises a cutting tool as opening aid in its interior.
[0251] FIG. 5 shows a flow diagram of a process 500 according to the invention for printing a sheetlike composite precursor. In a process step a) 501, the sheetlike composite precursor composed of the following mutually superposing layers is provided: a further polymer layer 203 of LDPE 19N430 from Ineos GmbH, Cologne (basis weight 15 g/m.sup.2); a carrier layer 104 of a Stora Enso Natura T Duplex twice-coated cardboard (Scott bond 200 J/m.sup.2, residual moisture content 7.5%, basis weight 210 g/m.sup.2); an intermediate polymer layer 105 of LDPE 19N430 from Ineos GmbH, Cologne (basis weight 18 g/m.sup.2); a barrier layer 106 of an EN AW 8079 aluminium foil from Hydro Aluminium Deutschland GmbH (thickness 6 m); an adhesion promoter layer 204 of Escor 6000 HSC from Exxon Mobil Corporation (basis weight 4 g/m.sup.2) and LDPE 19N430 from Ineos GmbH, Cologne (basis weight 22 g/m.sup.2); and an inner polymer layer 205 composed of a blend of 65% by weight of LDPE 19N430 from Ineos Kln GmbH and 35% by weight of Eltex 1315 AZ from Ineos Kln GmbH (blend basis weight 10 g/m.sup.2). In a process step b) 502, a liquid first polymer layer precursor composition 903 is applied by intaglio printing to a side of the further polymer layer 203 that is facing away from the carrier layer 104. This is done by contacting the further polymer layer 203 with a first printing form surface 901 of a first printing form 900. The printing form 900 is shown in FIG. 9.
[0252] FIG. 6 shows a flow diagram of a further process 500 according to the invention for printing a sheetlike composite precursor. The sheetlike composite 100 in FIG. 2 is obtained by means of the process 500. In a process step a) 501, the sheetlike composite precursor is provided. For this purpose, a further polymer layer 203 of LDPE 19N430 from Ineos GmbH, Cologne (basis weight 15 g/m.sup.2) is applied by laminar extrusion to a carrier layer 104 of a Stora Enso Natura T Duplex twice-coated cardboard (Scott bond 200 J/m.sup.2, residual moisture content 7.5%, basis weight 210 g/m.sup.2). Thereafter, an intermediate polymer layer 105 of LDPE 19N430 from Ineos GmbH, Cologne (basis weight 18 g/m.sup.2) and a barrier layer 106 of an EN AW 8079 aluminium foil from Hydro Aluminium Deutschland GmbH (thickness 6 m) are applied by lamination to a side of the carrier layer 104 that is opposite the further polymer layer 203. Furthermore, an adhesion promoter layer 204 of Escor 6000 HSC from Exxon Mobil Corporation (basis weight 4 g/m.sup.2) and LDPE 19N430 from Ineos GmbH, Cologne (basis weight 22 g/m.sup.2) and also an inner polymer layer 205 composed of a blend of 65% by weight of LDPE 19N430 from Ineos Kln GmbH and 35% by weight of Eltex 1315 AZ from Ineos Kln GmbH (blend basis weight 10 g/m.sup.2) are applied by laminar extrusion to a side of the barrier layer 106 that is facing away from the carrier layer 104. In a following process step i) 601, a surface tension of an outer surface of the sheetlike composite precursor, i.e. in this case a surface of the further polymer layer 203, is increased to 42 dyn/cm by a corona treatment with an input power of 4400 W at a web speed of the sheetlike composite precursor of 600 m/min. In a further process step ii) 602, in which can be performed after, before or at the same time as the process step i) 601, a liquid first polymer layer precursor composition 903 is obtained by mixing of a first composition component with a further composition component. The first composition component comprises a first colourant, and the further composition component comprises aromatic groups and aliphatic groups giving a ratio of the respective proportions of 0.63. In a process step b) 502, the liquid first polymer layer precursor composition 903 is applied by intaglio printing to a side of the further polymer layer 203 that is facing away from the carrier layer 104. This is done by contacting the further polymer layer 203 with a first printing form surface 901 of a first printing form 900. The printing form 900 is shown in FIG. 9. In a following process step c) 603, the liquid first polymer layer precursor composition 903 is hardened at 30 C., thereby obtaining a first polymer layer 103 of a sheetlike composite 100. In a process step d) 604, the first polymer layer 103 is overlaid by a liquid first colour application precursor composition by intaglio printing on a side facing away from the carrier layer 104. The liquid first colour application precursor composition comprises a Pigment Yellow PY 13 and also PVB as binder. In a process step e) 605, the first polymer layer 103 is overlaid by a liquid further colour application precursor composition by intaglio printing on the side facing away from the carrier layer 104. The liquid further colour application precursor composition comprises a Pigment Blue PB15:3 and also PVB as binder.
[0253] FIG. 7 shows a flow diagram of a process 700 according to the invention for producing a container precursor 300. In a process step a. 701, the sheetlike composite 100 according to FIG. 2 is provided. This comprises a first longitudinal rim and a further longitudinal rim. In a process step b. 702, the sheetlike composite 100 is folded. In a process step c. 703, the first longitudinal rim and the further longitudinal rim are pressed against one another and joined to one another by heat-sealing. Thus, a longitudinal seam 302 is obtained. According to the above description, the container precursor 300 according to FIG. 3 is produced.
[0254] FIG. 8 shows a flow diagram of a process 800 according to the invention for producing a closed container 400. In a process step A) 801, the container precursor 300 according to FIG. 3 is provided. In a process step B) 802, a base region 304 of the container precursor 300 is formed by folding the sheetlike composite 100. In a process step C) 803, the base region 304 is closed by sealing with hot air of a temperature of 300 C. In a process step D) 804, the container precursor 300 is filled with a food or drink product 401 and, in a process step E) 805, the container precursor 300 is closed by sealing in a top region 303, thereby obtaining the closed container 400. In a process step F) 806, the closed container 400 is connected to an opening aid 402. In a process step G) 807, the food or drink product 401 in the closed container 400 is preserved in a pressure chamber under a chamber pressure of 2 bar at a temperature of 110 C. in the presence of water vapour.
[0255] FIG. 9 shows a schematic diagram of a first printing form 900. The first printing form 900 is an intaglio print roll comprising a first printing form surface 901 which comprises a first multitude of recesses 902. The recesses 902, in this case wells 902, are characterized by a holding volume of 9 ml per m.sup.2 of the first printing form surface 901. The wells 902 of the first printing form surface 901 are all identical. The wells 902 comprise only part of the liquid first polymer layer precursor composition 903, since the wells 902 have been overfilled. Accordingly, the first printing form surface 901 has also been wetted with the liquid first polymer layer precursor composition 903 outside the wells 902. The liquid first polymer layer precursor composition 903 consists of 100 parts of a first composition component and 20 parts of a further composition component. The first composition component consists of 14.1% by weight of TiO.sub.2 (rutile type), 63.1% by weight of ethyl acetate as solvent, 11.2% by weight of polyvinyl chloride as binder, 3.9% by weight of a polyester containing OH groups from adipic acid as crosslinker, and additives. The further composition component consists of 56% by weight of ethyl acetate as solvent, 24% by weight of an aromatic polyisocyanate based on tolylene diisocyanate and 20% by weight of an aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) with trimethylolpropane. The liquid first polymer layer precursor composition 903 comprises aromatic groups and aliphatic groups in a ratio of their proportions of 0.30.
LIST OF REFERENCE SIGNS
[0256] 100 Sheetlike composite according to the invention [0257] 101 Outer face [0258] 102 Inner face [0259] 103 First polymer layer [0260] 104 Carrier layer [0261] 105 Intermediate polymer layer [0262] 106 Barrier layer [0263] 201 First colour application [0264] 202 Further colour application [0265] 203 Further polymer layer [0266] 204 Adhesion promoter layer [0267] 205 Inner polymer layer [0268] 300 Container precursor according to the invention [0269] 301 Edge [0270] 302 Longitudinal seam [0271] 303 Top region [0272] 304 Base region [0273] 305 Hole [0274] 306 Groove [0275] 400 Closed container according to the invention [0276] 401 Food or drink product [0277] 402 Lid with opening aid [0278] 500 Process according to the invention for printing a sheetlike composite precursor [0279] 501 Process step a) [0280] 502 Process step b) [0281] 601 Process step i) [0282] 602 Process step ii) [0283] 603 Process step c) [0284] 604 Process step d) [0285] 605 Process step e) [0286] 700 Process according to the invention for producing a container precursor [0287] 701 Process step a. [0288] 702 Process step b. [0289] 703 Process step c. [0290] 800 Process according to the invention for producing a closed container [0291] 801 Process step A) [0292] 802 Process step B) [0293] 803 Process step C) [0294] 804 Process step D) [0295] 805 Process step E) [0296] 806 Process step F) [0297] 807 Process step G) [0298] 900 First printing form/intaglio print roll [0299] 901 First printing form surface [0300] 902 Recess/well [0301] 903 Liquid first polymer layer precursor composition
