EP1630287B1 - Isolierender Karton - Google Patents
Isolierender Karton Download PDFInfo
- Publication number
- EP1630287B1 EP1630287B1 EP04255136A EP04255136A EP1630287B1 EP 1630287 B1 EP1630287 B1 EP 1630287B1 EP 04255136 A EP04255136 A EP 04255136A EP 04255136 A EP04255136 A EP 04255136A EP 1630287 B1 EP1630287 B1 EP 1630287B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- paperboard
- fibers
- ply
- insulating
- caliper
- 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.)
- Expired - Lifetime
Links
- 239000011087 paperboard Substances 0.000 title claims abstract description 113
- 239000000835 fiber Substances 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229920003043 Cellulose fiber Polymers 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000003431 cross linking reagent Substances 0.000 description 22
- -1 polyethylene Polymers 0.000 description 15
- 235000013877 carbamide Nutrition 0.000 description 12
- 239000002253 acid Substances 0.000 description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 9
- 239000011230 binding agent Substances 0.000 description 8
- 239000004698 Polyethylene Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000000123 paper Substances 0.000 description 7
- 229920000573 polyethylene Polymers 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 229920001131 Pulp (paper) Polymers 0.000 description 5
- 229920002472 Starch Polymers 0.000 description 5
- 238000004132 cross linking Methods 0.000 description 5
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 description 5
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- ZNZYKNKBJPZETN-WELNAUFTSA-N Dialdehyde 11678 Chemical compound N1C2=CC=CC=C2C2=C1[C@H](C[C@H](/C(=C/O)C(=O)OC)[C@@H](C=C)C=O)NCC2 ZNZYKNKBJPZETN-WELNAUFTSA-N 0.000 description 3
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- NNTWKXKLHMTGBU-UHFFFAOYSA-N 4,5-dihydroxyimidazolidin-2-one Chemical compound OC1NC(=O)NC1O NNTWKXKLHMTGBU-UHFFFAOYSA-N 0.000 description 2
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 2
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- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
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- WVJOGYWFVNTSAU-UHFFFAOYSA-N dimethylol ethylene urea Chemical compound OCN1CCN(CO)C1=O WVJOGYWFVNTSAU-UHFFFAOYSA-N 0.000 description 2
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- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 2
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- CEGRHPCDLKAHJD-UHFFFAOYSA-N 1,1,1-propanetricarboxylic acid Chemical compound CCC(C(O)=O)(C(O)=O)C(O)=O CEGRHPCDLKAHJD-UHFFFAOYSA-N 0.000 description 1
- CYSGHNMQYZDMIA-UHFFFAOYSA-N 1,3-Dimethyl-2-imidazolidinon Chemical compound CN1CCN(C)C1=O CYSGHNMQYZDMIA-UHFFFAOYSA-N 0.000 description 1
- YORGLSZZMFADAJ-UHFFFAOYSA-N 1,3-dihydroxy-1,3-dimethylurea Chemical compound CN(O)C(=O)N(C)O YORGLSZZMFADAJ-UHFFFAOYSA-N 0.000 description 1
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 1
- CFPOJWPDQWJEMO-UHFFFAOYSA-N 2-(1,2-dicarboxyethoxy)butanedioic acid Chemical compound OC(=O)CC(C(O)=O)OC(C(O)=O)CC(O)=O CFPOJWPDQWJEMO-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- ZMGMDXCADSRNCX-UHFFFAOYSA-N 5,6-dihydroxy-1,3-diazepan-2-one Chemical class OC1CNC(=O)NCC1O ZMGMDXCADSRNCX-UHFFFAOYSA-N 0.000 description 1
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical group FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 235000005018 Pinus echinata Nutrition 0.000 description 1
- 241001236219 Pinus echinata Species 0.000 description 1
- 235000017339 Pinus palustris Nutrition 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 229920002873 Polyethylenimine Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 244000269722 Thea sinensis Species 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 150000008043 acidic salts Chemical class 0.000 description 1
- 125000003172 aldehyde group Chemical group 0.000 description 1
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- 235000019270 ammonium chloride Nutrition 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- MIGNWTQKRPNYLP-UHFFFAOYSA-N but-2-ene-2,3-diol urea Chemical compound NC(=O)N.OC(=C(C)O)C MIGNWTQKRPNYLP-UHFFFAOYSA-N 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- HXDRSFFFXJISME-UHFFFAOYSA-N butanedioic acid;2,3-dihydroxybutanedioic acid Chemical compound OC(=O)CCC(O)=O.OC(=O)C(O)C(O)C(O)=O HXDRSFFFXJISME-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
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- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical class [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
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- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
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- QUBQYFYWUJJAAK-UHFFFAOYSA-N oxymethurea Chemical compound OCNC(=O)NCO QUBQYFYWUJJAAK-UHFFFAOYSA-N 0.000 description 1
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- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 1
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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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
- D21H11/20—Chemically or biochemically modified fibres
-
- 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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
- D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
Definitions
- the present invention relates to an insulating paperboard, and more particularly to an insulating paperboard containing bulky fibers.
- Hot foods are commonly served and consumed in disposable containers. These containers are made from a variety of materials including paperboard and foamed polymeric sheet material.
- paperboard and foamed polymeric sheet material One of the least expensive sources of paperboard material is cellulose fibers. Cellulose fibers are employed to produce excellent paperboards for the production of hot cups, paper plates, and other food and beverage containers.
- Conventional paperboard produced from cellulosic fibers is relatively dense, and therefore, transmits heat more readily than, for example, foamed polymeric sheet material.
- hot liquids are typically served in double cups or in cups containing multiple plies of conventional paperboard.
- insulating paperboard produced from cellulosic material that has good insulating characteristics, that will allow the user to sense that food in the container is warm or hot and at the same time will allow the consumer of the food or beverage in the container to hold the container for a lengthy period of time without the sensation of excessive temperature. It is further desirable to provide an insulating paperboard that can be tailored to provide a variety of insulating characteristics so that the temperature drop across the paperboard can be adjusted for a particular end use.
- US-A-6736933 discloses a multi-ply paperboard comprising at least one ply of conventional cellulose fibers and from about 0.1 to about 6 weight percent of a water-borne binding agent; and at least one ply of chemically intrafiber crosslinked cellulose high-bulk fibers and from about 0.1 to about 6 percent of a water-borne binding agent.
- US-A-5906894 discloses a multi-ply paperboard comprising at least one ply of conventional cellulose fibers and from about 0.1 to about 6 weight percent of a water-borne binding agent; and at least one ply containing up to 20% of chemically intra-fiber crosslinked cellulosic high-bulk fibers and from about 0.1 to about 6 weight percent of a water-borne binding agent.
- This invention provides an insulating paperboard comprising at least one layer of cellulose fibers, characterised in that at least some of the cellulose fibers in said at least one layer are crosslinked cellulose fibers to provide bulky fibers and which are present in an amount from 25% to 100% of said at least one layer, said paperboard being sufficiently insulating to provide a hot water ⁇ T across said paperboard of at least 0.7°C ⁇ 2.3°C per 0.1 mm of calliper, said paperboard having a density of less than 0.5 g/cc, and a basis weight of from 200 gsm to 500 gsm, and the caliper of said board being greater than or equal to 0.5 mm.
- the paperboard may have a basis weight of from 250 gsm to 400 gsm.
- said paperboard has a hot water ⁇ T of 9°C ⁇ 2.3°C at a caliper of 0.6 mm and a hot water ⁇ T of 14°C ⁇ 2.3°C at a caliper of 1.25 mm, said hot water ⁇ T being a substantially linear progression relative to caliper in the temperature range from below 9°C to above 14°C.
- said linear progression may extend from a ⁇ T of 9°C to a . ⁇ T of 14°C.
- said paperboard may be at least a two-ply board, said at least one ply containing said crosslinked cellulose fibers.
- the substrate 10 for the insulating paperboard 12 of the present invention is produced in a conventional manner from readily available fibers such as cellulosic fibers.
- the paperboard of the present invention can be made in a single-ply, a two-ply construction, or a multi-ply construction, as desired. While the paperboard of the present invention may employ synthetic fibers as set forth above, it is most preferred that paperboard comprise all or substantially all of the cellulosic fibers.
- the distinguishing characteristic of the present invention is that at least one ply 14 of the paperboard, whether a single-ply or a multiple-ply structure, contains bulky fibers.
- the bulky fibers increase the bulk density of the paperboard and thus the insulating characteristics.
- bulky fibers are kinked, twisted, curly, cellulosic fibers. It is preferred, however, that the fibers be produced by intrafiber crosslinking of the cellulosic fibers as described in more detail below.
- Paperboard of the present invention may have a broad set of characteristics.
- its basis weight can range from 200 gsm to 500 gsm, more preferably, from 250 gsm to 400 gsm. Most preferably, the basis weight of the paperboard is equal to or greater than 250 gsm.
- the paperboard has a density of less than 0.5 g/cc, more preferably, from 0.3 g/cc to 0.45 g/cc, and most preferably, from 0.35 g/cc to 0.40 g/cc.
- thermo drop characteristics can be achieved. These temperature drop characteristics can be achieved by altering the amount of bulky fiber introduced into the paperboard, by adjusting the basis weight of the paperboard, by adjusting the caliper of the paperboard after it has been produced by running it, for example, through nip rolls, and of course, by varying the number and thickness of additional plies incorporated in the paperboard structure. It is preferred that this paperboard have a caliper greater than or equal to 0.5 mm, a basis weight equal to or greater than 250 gsm, and a density less than 0.5 g/cc.
- the paperboard of the present invention exhibits a hot water ⁇ T of 10°C ⁇ 2.3°C at a caliper of 0.64 mm and a hot water ⁇ T of 14°C ⁇ 2.3°C at a caliper of 1.25 mm.
- the relationship of hot water ⁇ T to thickness is a linear one between the calipers of 0.6 mm and 1.25 mm and continues to be linear with a reduction in the caliper below 0.6 mm or an increase above 1.25 mm.
- a paperboard constructed in accordance with the present invention having a caliper of 0.3 mm or greater will exhibit a hot water ⁇ T (as defined below) of 0.7°C ⁇ 2.3°C per 0.1 mm of caliper, and most preferably a hot water ⁇ T of 0.7°C ⁇ 2.0°C.
- the paperboard of the invention can be a single-ply product.
- the low density characteristics of the paperboard of the present invention allow the manufacture of a thicker paperboard at a reasonable basis weight.
- the normal paperboard thickness would have to be doubled relative to that of the present invention.
- an insulating paperboard having the same basis weight as a normal paperboard can be made. This effectively allows the manufacture of insulating paperboard on existing paperboard machines with minor modifications and minor losses in productivity.
- a one-ply paperboard has the advantage that the whole structure is at a low density. Furthermore, as will be described later, the low density paperboard of the present invention is easily embossable.
- the paperboard of the invention can be multi-ply product, and include two, three, or more plies.
- Paperboard that includes more than a single-ply can be made by combining the plies either before or after drying. It is preferred, however, that a multi-ply paperboard be made by using multiple headboxes arranged sequentially in a wet-forming process, or by a baffled headbox having the capacity of receiving and then laying multiple pulp furnishes.
- the individual plies of a multi-ply product can be the same or different.
- the paperboard of the present invention can be formed using conventional papermaking machines including, for example, Rotoformer, Fourdrinier, inclined wire Delta former, and twin-wire forming machines.
- a single-ply paperboard When a single-ply paperboard is used in accordance with the present invention, it is preferably homogeneous in composition.
- the single ply may be stratified with respect to composition and have one stratum enriched with bulky fibers and another stratum enriched with non-bulky fibers.
- one surface of the paperboard may be enriched with bulky fibers to enhance that surface's bulk and the other surface enriched with non-crosslinked fibers to provide a smooth, denser, less porous surface.
- the bulky fibers are uniformly intermixed with the regular cellulosic fibers.
- the bulky fibers present in the insulating ply or layer be present in an amount from about 25% to about 100%, and more preferably from about 30% to about 70%.
- the first ply may contain 100% non-bulky fibers while the second ply may contain from 25% to 100% bulky fibers and preferably from 30% to 70% bulky fibers.
- the bottom and top layers may comprise 100% of non-bulky fibers while the middle layer contains from about 25% to about 100% and preferably from about 30% to about 70% of bulky fibers.
- the paperboard exiting the papermaking machine can be compressed to varying degrees to adjust the temperature drop characteristics across the paperboard.
- the paperboard once leaving the papermaking machine may be compressed or reduced in caliper by up to 50 %, and more preferably, from 15% to 25%. This adjustment in the caliper of the paperboard made in accordance with the present invention allows the hot water ⁇ T to be varied as desired. This same result can be achieved by lowering the basis weight of the paperboard.
- the paperboard of the present invention can be embossed with a variety of conventional embossing rollers to produce a paperboard that has a tactile sense to the user quite different from that of the conventional paperboard.
- An embossed surface not only provides a better gripping surface, but also provides an actual and perceived reduction in the heat transfer from the surface of the paperboard to a person touching the exterior of the paperboard.
- Flat embossed cauls may also be used to form an embossed pattern on the paperboard. Any of a variety of embossed patterns can be employed.
- the paperboard when the paperboard is to be employed as a single-ply layer for a hot cup, it is preferred that a fine pattern of indentations be embossed into the cup so as in essence to provide a multiplicity of small surface indents that effectively reduce the contact surface area for a person touching the surface of the paperboard. This is especially effective when the paperboard is used in a hot cup or other container that is held by a person for any period of time.
- the reduction in surface area reduces the amount of heat transferred to the person's fingers and thus reduces the sensation of excessive temperature.
- the number of bumps and depressions in a one centimeter square surface of paperboard might comprise a 6 by 6 array.
- the paperboard of the present invention can be utilized to make a variety of structures, particularly containers, in which it is desired to have insulating characteristics.
- one of the most common of these containers is the ubiquitous hot cup utilized for hot beverages such as coffee, tea, and the like.
- Other insulating containers such as the ordinary paper plate can also incorporate the paperboard of the present invention.
- carry-out containers conventionally produced of paperboard or of foam material can also employ the paperboard of the present invention.
- a hot cup type container produced in accordance with the present invention may comprise one or more plies 22 and 24, one of which, in this instance 24, contains bulky fibers. In this embodiment the bulky fibers are in the interior ply 24.
- a liquid impervious backing 26 is preferably laminated to the interior ply.
- the backing may comprise, for example, a variety of thermoplastic materials, such as polyethylene. It is preferred that the paperboard used in the bottom of the cup contain no bulky fibers.
- nonbulky cellulosic fibers usable in the present invention are derived primarily from wood pulp.
- Suitable wood pulp fibers for use with the invention can be obtained from well-known chemical processes such as the kraft and sulfite processes, with or without subsequent bleaching. Pulp fibers can also be processed by thermomechanical, chemithermomechanical methods, or combinations thereof. The preferred pulp fiber is produced by chemical methods. Groundwood fibers, recycled or secondary wood pulp fibers, and bleached and unbleached wood pulp fibers can be used. Softwoods and hardwoods can be used. Details of the selection of wood pulp fibers are well known to those skilled in the art.
- Fibers are commercially available from a number of companies, including Weyerhaeuser Company, the assignee of the present invention.
- suitable cellulose fibers produced from southern pine that are usable with the present invention are available from Weyerhaeuser Company under the designations CF416, NF405, PL416, FR516, and NB416.
- the paperboard of the invention may optionally include a binding agent.
- Suitable binding agents are soluble in, dispersible in, or form a suspension in water.
- Suitable binding agents include those agents commonly used in the paper industry to impart wet and dry tensile and tearing strength to such products.
- Suitable wet strength agents include cationic modified starch having nitrogen-containing groups (e.g., amino groups), such as those available from National Starch and Chemical Corp., Bridgewater, NJ; latex; wet strength resins, such as polyamide-epichlorohydrin resin (e.g., KYMENE 557LX, Hercules, Inc., Wilmington, DE), and polyacrylamide resin (see, e.g., U.S. Patent No.
- binding agents include starch, modified starch, polyvinyl alcohol, polyvinyl acetate, polyethylene/acrylic acid copolymer, acrylic acid polymers, polyacrylate, polyacrylamide, polyamine, guar gum, oxidized polyethylene, polyvinyl chloride, polyvinyl chloride/acrylic acid copolymers, acrylonitrile/butadiene/styrene copolymers, and polyacrylonitrile. Many of these will be formed into latex polymers for dispersion or suspension in water.
- the preferred bulky fibers for use in the invention are crosslinked cellulosic fibers. Any one of a number of crosslinking agents and crosslinking catalysts, if necessary, can be used to provide the crosslinked fibers to be included in the layer. The following is a representative list of useful crosslinking agents and catalysts. Each of the patents noted below is expressly incorporated herein by reference in its entirety.
- Suitable urea-based crosslinking agents include substituted ureas, such as methylolated ureas, methylolated cyclic ureas, methylolated lower alkyl cyclic ureas, methylolated dihydroxy cyclic ureas, dihydroxy cyclic ureas, and lower alkyl substituted cyclic ureas.
- Specific urea-based crosslinking agents include dimethyldihydroxy urea (DMDHU, 1,3-dimethyl-4,5-dihydroxy-2-imidazolidinone), dimethyloldihydroxyethylene urea (DMDHEU, 1,3-dihydroxymethyl-4,5-dihydroxy-2-imidazolidinone), dimethylol urea (DMU, bis[N-hydroxymethyl]urea), dihydroxyethylene urea (DHEU, 4,5-dihydroxy-2-imidazolidinone), dimethylolethylene urea (DMEU, 1,3-dihydroxymethyl-2-imidazolidinone), and dimethyldihydroxyethylene urea (DMeDHEU or DDI, 4,5-dihydroxy-1,3-dimethyl-2-imidazolidinone).
- Suitable crosslinking agents include dialdehydes such as C 2 -C 8 dialdehydes (e.g., glyoxal), C 2 -C 8 dialdehyde acid analogs having at least one aldehyde group, and oligomers of these aldehyde and dialdehyde acid analogs, as described in U.S. Patent Nos. 4,822,453 ; 4,888,093 ; 4,889,595 ; 4,889,596 ; 4,889,597 ; and 4,898,642 .
- Other suitable dialdehyde crosslinking agents include those described in U.S. Patent Nos. 4,853,086 ; 4,900,324 ; and 5,843,061 .
- Suitable crosslinking agents include aldehyde and urea-based formaldehyde addition products. See, for example, U.S. Patent Nos. 3,224,926 ; 3,241,533 ; 3,932,209 ; 4,035,147 ; 3,756,913 ; 4,689,118 ; 4,822,453 ; 3,440,135 ; 4,935,022 ; 3,819,470 ; and 3,658,613 .
- Suitable crosslinking agents may also include glyoxal adducts of ureas, for example, U.S. Patent No. 4,968,774 , and glyoxal/cyclic urea adducts as described in U.S. Patent Nos. 4,285,690 ; 4,332,586 ; 4,396,391 ; 4,455,416 ; and 4,505,712 .
- crosslinking agents include carboxylic acid crosslinking agents such as polycarboxylic acids.
- Polycarboxylic acid crosslinking agents e.g., citric acid, propane tricarboxylic acid, and butane tetracarboxylic acid
- catalysts are described in U.S. Patent Nos. 3,526,048 ; 4,820,307 ; 4,936,865 ; 4,975,209 ; and 5,221,285 .
- C 2 -C 9 polycarboxylic acids that contain at least three carboxyl groups e.g., citric acid and oxydisuccinic acid
- crosslinking agents is described in U.S. Patent Nos. 5,137,537 ; 5,183,707 ; 5,190,563 ; 5,562,740 ; and 5,873,979 .
- Polymeric polycarboxylic acids are also suitable crosslinking agents.
- Suitable polymeric polycarboxylic acid crosslinking agents are described in U.S. Patent Nos. 4,391,878 ; 4,420,368 ; 4,431,481 ; 5,049,235 ; 5,160,789 ; 5,442,899 ; 5,698,074 ; 5,496,476 ; 5,496,477 ; 5,728,771 ; 5,705,475 ; and 5,981,739 .
- Polyacrylic acid and related copolymers as crosslinking agents are described U.S. Patent Nos. 5,549,791 and 5,998,511 .
- Polymaleic acid crosslinking agents are described in U.S. Patent No. 5,998,511 and U.S. Application Serial No. 09/886,821 .
- polycarboxylic acid crosslinking agents include citric acid, tartaric acid, malic acid, succinic acid, glutaric acid, citraconic acid, itaconic acid, tartrate monosuccinic acid, maleic acid, polyacrylic acid, polymethacrylic acid, polymaleic acid, polymethylvinylether-co-maleate copolymer, polymethylvinylether-co-itaconate copolymer, copolymers of acrylic acid, and copolymers of maleic acid.
- Other suitable crosslinking agents are described in U.S. Patent Nos. 5,225,047 ; 5,366,591 ; 5,556,976 ; and 5,536,369 .
- Suitable crosslinking catalysts can include acidic salts, such as ammonium chloride, ammonium sulfate, aluminum chloride, magnesium chloride, magnesium nitrate, and alkali metal salts of phosphorous-containing acids.
- the crosslinking catalyst is sodium hypophosphite.
- the crosslinking agent is applied to the cellulosic fibers as they are being produced in an amount sufficient to effect intrafiber crosslinking.
- the amount applied to the cellulosic fibers may be from about 1% to about 25% by weight based on the total weight of fibers.
- crosslinking agent in an amount from about 4% to about 6% by weight based on the total weight of fibers. Mixtures or blends of crosslinking agents and catalysts can also be used.
- Hot water ⁇ T is determined in a simulated tester that models the heat transfer through a paper cup.
- a box of plexiglass measuring 12.1 cm by 12.1 cm by 12.1 cm has a sample opening of 8.9 cm by 8.9 cm.
- the box is insulated with 2.54 cm thick polystyrene foam.
- a sample of paperboard is laminated with a sheet of polyethylene using a hot air gun to adhere the polyethylene to the surface of the paperboard. Alternatively, the polyethylene may be extruded onto the surface of the board.
- Hot water at a temperature of 87.8°C is poured into the box, a small stir bar inserted, and the polyethylene coated face of the sample is placed into the apparatus.
- thermocouple microprobes are taped to the outside of the paperboard surface with conducting tape.
- a data logger records the temperature of the inside water temperature and the outside surface temperature from which the temperature drop (hot water ⁇ T) can be calculated.
- an infrared pyrometer with a 0.93 emissivity is aimed at the outside of the sample and the IR radiation measured. This IR gun is used to correlate the thermocouple accuracy.
- Durometer tests were conducted in accordance with ASTM method D2240-91. This ASTM method is for rubber, cellular materials, elastomeric materials, thermoplastic materials, and hard plastics.
- a plurality of lab scale samples were produced on a pilot scale on a Delta Former, an inclined wire twinhead former. Both single-ply and two-ply samples were produced.
- the single-ply samples contained varying weight percentages of bulky fibers.
- varying levels of bulky fiber were used in the base (bottom) layer.
- the nonbulky fiber was a cellulose softwood pine that was refined to 400 Canadian standard freeness (CSF).
- the bulky fiber employed was a fiber crosslinked with malic acid.
- the crosslinked cellulose fiber was crosslinked with a crosslinking agent. The pH of the system was adjusted to 8 with caustic.
- the reduced hardness of the paperboard made in accordance with the present invention clearly indicates that the paperboard is more easily embossable than standard paperboard with no bulky fiber.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Paper (AREA)
- Organic Insulating Materials (AREA)
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
- Processes Specially Adapted For Manufacturing Cables (AREA)
- Insulating Bodies (AREA)
- Packages (AREA)
Claims (5)
- Isolierende Pappe umfassend:mindestens eine Schicht Cellulosefasern, dadurch gekennzeichnet, dass mindestens einige der Cellulosefasern in der mindestens einen Schicht vernetzte Cellulosefasern sind, um voluminöse Fasern bereitzustellen, und die in einer Menge von 25% bis 100% der mindestens einen Schicht vorhanden sind, wobei die Pappe ausreichend isolierend ist, um eine Heißwasser-ΔT über die Pappe von mindestens 0,7°C ± 2,3°C pro 0,1 mm Dicke (calliper) bereitzustellen, wobei die Pappe eine Dichte von weniger als 0,5 g/cm3 und ein Flächengewicht (basis weight) von 200 g/m2 bis 500 g/m2 besitzt, und wobei die Dicke des Kartons größer als oder gleich 0,5 mm ist.
- Isolierende Pappe nach Anspruch 1, dadurch gekennzeichnet, dass die Pappe ein Flächengewicht von 250 g/m2 bis 400 g/m2 besitzt.
- Isolierende Pappe nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, dass die Pappe eine Heißwasser-ΔT von 9°C ± 2,3°C bei einer Dicke von 0,6 mm und eine Heißwasser-ΔT von 14°C ± 2,3°C bei einer Dicke von 1,25 mm besitzt, wobei die Heißwasser-ΔT eine im Wesentlichen lineare Progression relativ zur Dicke im Temperaturbereich von unter 9°C bis über 14°C ist.
- Isolierende Pappe nach Anspruch 3, dadurch gekennzeichnet, dass die lineare Progression sich von einer ΔT von 9°C bis zu einer ΔT von 14°C erstreckt.
- Isolierende Pappe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Pappe mindestens ein zweischichtiger Karton ist, wobei mindestens eine Schicht die vernetzten Cellulosefasern enthält.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT04255136T ATE483063T1 (de) | 2004-08-26 | 2004-08-26 | Isolierender karton |
DE602004029356T DE602004029356D1 (de) | 2004-08-26 | 2004-08-26 | Isolierender Karton |
EP04255136A EP1630287B1 (de) | 2004-08-26 | 2004-08-26 | Isolierender Karton |
PL04255136T PL1630287T3 (pl) | 2004-08-26 | 2004-08-26 | Karton izolacyjny |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04255136A EP1630287B1 (de) | 2004-08-26 | 2004-08-26 | Isolierender Karton |
Publications (2)
Publication Number | Publication Date |
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EP1630287A1 EP1630287A1 (de) | 2006-03-01 |
EP1630287B1 true EP1630287B1 (de) | 2010-09-29 |
Family
ID=34930590
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP04255136A Expired - Lifetime EP1630287B1 (de) | 2004-08-26 | 2004-08-26 | Isolierender Karton |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1630287B1 (de) |
AT (1) | ATE483063T1 (de) |
DE (1) | DE602004029356D1 (de) |
PL (1) | PL1630287T3 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US20060144537A1 (en) * | 2004-12-30 | 2006-07-06 | Schwonke Paul A | Paperboard |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5906894A (en) * | 1994-03-25 | 1999-05-25 | Weyerhaeuser Company | Multi-ply cellulosic products using high-bulk cellulosic fibers |
EP0752029A1 (de) * | 1994-03-25 | 1997-01-08 | Weyerhaeuser Company | Mehrlagige zellstoffprodukte aus voluminösen zellstofffasern |
US6740373B1 (en) * | 1997-02-26 | 2004-05-25 | Fort James Corporation | Coated paperboards and paperboard containers having improved tactile and bulk insulation properties |
US6416829B2 (en) * | 1997-06-06 | 2002-07-09 | Fort James Corporation | Heat insulating paper cups |
-
2004
- 2004-08-26 AT AT04255136T patent/ATE483063T1/de not_active IP Right Cessation
- 2004-08-26 EP EP04255136A patent/EP1630287B1/de not_active Expired - Lifetime
- 2004-08-26 DE DE602004029356T patent/DE602004029356D1/de not_active Expired - Lifetime
- 2004-08-26 PL PL04255136T patent/PL1630287T3/pl unknown
Also Published As
Publication number | Publication date |
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PL1630287T3 (pl) | 2011-03-31 |
EP1630287A1 (de) | 2006-03-01 |
ATE483063T1 (de) | 2010-10-15 |
DE602004029356D1 (de) | 2010-11-11 |
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