EP1739030A2 - Isolierender Karton - Google Patents

Isolierender Karton Download PDF

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Publication number
EP1739030A2
EP1739030A2 EP06253344A EP06253344A EP1739030A2 EP 1739030 A2 EP1739030 A2 EP 1739030A2 EP 06253344 A EP06253344 A EP 06253344A EP 06253344 A EP06253344 A EP 06253344A EP 1739030 A2 EP1739030 A2 EP 1739030A2
Authority
EP
European Patent Office
Prior art keywords
paperboard
fibers
insulating
processed
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.)
Withdrawn
Application number
EP06253344A
Other languages
English (en)
French (fr)
Inventor
Daniel T. Bunker
Shahrokh A. Naieni
Richard A. Edmark
Mario Villa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weyerhaeuser Co
Original Assignee
Weyerhaeuser Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Weyerhaeuser Co filed Critical Weyerhaeuser Co
Publication of EP1739030A2 publication Critical patent/EP1739030A2/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/38—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation
    • B65D81/3865—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation drinking cups or like containers
    • B65D81/3874—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation drinking cups or like containers formed of different materials, e.g. laminated or foam filling between walls
    • 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
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • 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
    • D21H11/08—Mechanical or thermomechanical pulp
    • 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
    • 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

Definitions

  • the present application relates to an insulating paperboard, and more particularly to an insulating paperboard containing processed cellulosic 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, press-molded paperboard plates and bowls, 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 doubled cups of conventional paperboard or in cups with sleeves.
  • 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.
  • the substrate 10 for the insulating paperboard 12 of the present application is produced in a conventional manner from readily available fibers such as cellulosic fibers.
  • the paperboard of the present application can be made in a single-ply, a two-ply construction, or a multi-ply construction, as desired.
  • the distinguishing characteristic of the present application is that at least one ply, 14, of the insulating paperboard, whether a single-ply or a multiple-ply structure, contains processed cellulosic fibers in addition to chemical pulp fibers.
  • the processed cellulosic fibers increase the insulating characteristics of the board.
  • chemical pulp fibers useable in the present application are derived primarily from wood pulp and may be refined. Suitable wood pulp fibers for use with the application can be obtained from well-known chemical processes such as the kraft and sulfite processes, with or without subsequent bleaching. Softwoods and hardwoods can be used. Details of the selection of wood pulp fibers are well known to those skilled in the art.
  • suitable cellulosic fibers produced from southern pine that are useable in the present application are available from a number of companies including Weyerhaeuser Company under the designations CF416, PL416, FR416 , and NB416.
  • a bleached Kraft wet lap pulp, KKT, Prince Albert Softwood and Grande Prairie Softwood, all manufactured by Weyerhaeuser are examples of northern softwoods that can be used.
  • processed cellulosic fibers include fibers that are 1) chemically processed to change the cellulose from Cellulose 1 to Cellulose 11, such as mercerized and mercerized flash dried fibers in which the mercerization is conducted as one stage in the bleaching process.
  • Mercerized fibers such as HPZ and mercerized flash dried fibers such as HPZ III, both manufactured by Buckeye Technologies, Memphis TN, and Porosinier- J-HP available from Rayonier Performance Fibers Division, Jessup, GA are suitable for use in the present application. These mercerized softwood pulps have an ⁇ -cellulose purity of 95% or greater and are stiff fibers. Processed fibers also include 2) mechanically and chemimechanically treated fibers such as chemithermomechanical pulp fibers (CTMP), bleached chemithermomechanical pulp fibers (BCTMP), thermomechanical pulp fibers (TMP), refiner groundwood pulp fibers and groundwood pulp fibers. Recycled or secondary wood pulp fibers are also suitable.
  • CTMP chemithermomechanical pulp fibers
  • BCTMP bleached chemithermomechanical pulp fibers
  • TMP thermomechanical pulp fibers
  • refiner groundwood pulp fibers refiner groundwood pulp fibers and groundwood pulp fibers. Recycled or secondary wood pulp fiber
  • TMP thermomechanical pulp
  • TMP thermomechanical pulp
  • Weyerhaeuser Federal Way, WA, made by passing wood chips through three stages of dual refiners
  • CTMP chemithermomechanical pulp
  • Other processed fibers include jet dried cellulosic fibers and treated jet dried cellulosic fibers manufactured by the Weyerhaeuser Company by the method described in U.S. Application No.10/923,447 filed August 20, 2004 .
  • a slurry of pulp fibers is dewatered to a consistency of approximately 34% and then passed through a jet drier having an inlet temperature of approximately 190°C to 400°C an outlet temperature of 50°C to 205°C and a steam pressure of approximately 1082 kPa (157 psig) These fibers are twisted kinked and curled.
  • Additional processed fibers include flash dried and treated flash dried fibers as described in U.S. 6,837,970 , Mixtures of processed fibers can also be used.
  • Paperboard of the present application may have a broad set of characteristics.
  • its basis weight can range from 200 gsm to 500 gsm, in another embodiment the basis weight ranges from 250 gsm to 400 gsm.
  • the basis weight of the paperboard is equal to or greater than 250 gsm.
  • the insulating paperboard has a density of less than 0.5 g/cc, in another embodiment the density is from 0.3 g/cc to 0.45 g/cc, and in another embodiment the density is 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 processed 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.
  • the paperboard has a caliper greater than or equal to 0.4 mm, a basis weight equal to or greater than 230 gsm, and a density less than about 0.5 g/cc. Insulating paperboard properties are given in Table 1, below.
  • Table 1 Insulating Paperboard Properties Fiber Wt. % Fiber Sample No. Basis Wt (gsm Density, g/cc Caliper (mm) A&T Taber Stiffness (g-cm) Tensile Index (Nm/g) ZDT (kPa) ⁇ T, °C Jet Dried 5 1 232 0.55 0.42 79.3 52.2 572.3 3.0 HPZ III 5 2 231 0.53 0.44 76.0 60.3 577.8 2.8 HPZ 60 3 228 0.38 0.60 75.6 30.4 318.5 5.7 HPZ III 5 4 351 0.55 0.64 228.8 48.9 610.9 5.1 Jet Dried 60 5 348 0.42 0.84 235.7 25.3 285.4 9.3 HPZ 3 60 6 345 0.36 0.95 145.4 20.1 222.0 9.1 HPZ 60 7 341 0.36 0.95 258.2 23.6 223.4 8.8 BCTMP 1 60 8 323 0.31 1.03 361.6 35.7 302.0 11.2 Jet dried 60 9 552 0.52 1.06 1013.0 4
  • the paperboard of the present application exhibits a hot water ⁇ T of at least 4.4°C at a caliper of 0.5 mm and a hot water ⁇ T of 8.65 °C at a caliper of at least 1 mm.
  • the relationship of hot water ⁇ T (as defined below) to caliper is a linear one between the calipers of 0.4 mm and 1 mm and continues to be linear with a reduction in the caliper below 0.4 mm or an increase above 1 mm.
  • a paperboard constructed in accordance with the present application having a caliper of 0.4 mm or greater will exhibit a hot water ⁇ T of about 0.8°C per 0.1 mm of caliper.
  • the paperboard of the application can be a single-ply product.
  • the low density characteristics of the paperboard of the present application allows 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 application.
  • 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.
  • the paperboard of the application 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.
  • Multi-ply paperboard can 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 application 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 used in accordance with the present application, it is homogeneous in composition.
  • the single ply may be stratified with respect to composition and have one stratum enriched with processed cellulosic fibers and another stratum enriched with cellulosic fibers to provide a smooth, denser, less porous surface.
  • the processed cellulosic fibers are present in the insulating ply or layer in an amount from about 25% to about 70%, in another embodiment they are present in an amount of from 30% to about 60%.
  • the first ply may contain 100% cellulosic fibers while the second ply may contain from 25% to 70% processed cellulosic fibers.
  • the second ply may contain from 35% to 60% processed cellulosic fibers.
  • the bottom and top layers may comprise 100% of cellulosic fibers while the middle layer contains from about 25% to about 70% of processed cellulosic fibers.
  • the middle layer in a three ply layer, may contain from about 35% to about 60% of processed cellulosic fibers.
  • the paperboard of the present application has a broad set of strength properties.
  • the Taber stiffness may range from about 125 g-cm to about 1100 g-cm. In another embodiment the Taber stiffness ranges from about 400 to about 800 g-cm and in yet another embodiment the Taber stiffness ranges from about 500 to about 650 g-cm. Taber stiffness was determined by ISO 24393:1992 E except for units reported. The TAPPI counterpart is 489 OM-92.
  • the paperboard also has a range of tensile properties with can be tailored.
  • the tensile index ranges from about 20 Nm/g to about 70 Nm/g.
  • the tensile index ranges from about 30 Nm/g to about 50 Nm/g and in yet another embodiment the ranges is from 35 Nm/g to 45 Nm/g.
  • Tensile index was determined by TAPPI 494.
  • ZDT Z-direction tensile
  • Sheet bulk was determined by TAPPI 411 and sheet density was calculated as the reciprocal of sheet bulk.
  • the paperboard of the present application 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 food service items that could benefit from improved insulating properties such as soup cups, and press-molded plates and bowls can also incorporate the paperboard of the present application.
  • carry-out containers conventionally produced of paperboard or of foam material can also employ the paperboard of the present application.
  • a hot cup type container produced in accordance with the present application may comprise one or more plies 22 and 24, one of which, in this instance, 24, contains processed cellulosic fibers.
  • the processed cellulosic 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 processed cellulosic fibers.
  • the paperboard of the application may 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.
  • 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 on one surface with TartanTM Label Protection Tape Clear 3765 by 3M (St. Paul, MN).
  • 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. Stated in another way, ⁇ T is the difference between the inside water temperature and the outside surface temperature.
  • ⁇ T is the difference between the inside water temperature and the outside surface temperature.
  • This method is representative of making a 300 gsm board with 60 % CTMP.
  • Other paperboards, shown in Table 1, of various basis weights and processed fiber levels can be made with adjustment to the appropriate amounts and weights of fiber and other additives.
  • the bleached Douglas Fir component was refined to 510 CSF; crill (bleached Douglas Fir refined to 50 CSF) was added to all samples at a level of 5% of total dry fiber weight.
  • CTMP 44.44 g fiber (40.83 % consistency), 37.4 g Douglas Fir refined to 510 CSF (29.1 % consistency),60.5 g Douglas Fir refined to 50 CSF (2.5 % consistency), (crill), and 3.02 g polyvinylalcohol (Celvol 165SF PVOH, available from Celanese, Dallas TX), 100 % solids, were disintegrated for 5 minutes in a British Disintegrator. The mixture was diluted to 4 L withdeionized water and adjusted to a pH of 7.2-7.4 using NaHCO 3 .
  • a 31.75 x 31.75 cm forming wire (155 mesh) was placed in the bottom of a Noble & Wood 12" by 12" handsheet mold, the slurry poured into the sheet mold, diluted to 35 liters with deionized water and mixed with a plunger. The slurry was then drained, dewatered by using blotters with even hand pressing until the sheet reached a consistency of approximately 20%. The sheet was removed from the screen and blotted further to approximately 30% solids. Blotters were placed on each side of the sample, the sample placed between damp felts and then passed through a press at 137.8 kPa (20 psi) to further dewater the sample. The solids content at this point was approximately 40 %.
  • the resulting sheet was placed on a drum dryer, ( surface temperature of 121 °C), between two dry blotters and allowed to dry for 10 minutes. The sample was then inverted and allowed to dry an additional 10 minutes. The sample was conditioned in a 50 % Relative Humidity room for a minimum of 4 hours prior to testing.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Organic Insulating Materials (AREA)
  • Packages (AREA)
EP06253344A 2005-06-30 2006-06-27 Isolierender Karton Withdrawn EP1739030A2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17102405A 2005-06-30 2005-06-30

Publications (1)

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EP1739030A2 true EP1739030A2 (de) 2007-01-03

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ID=37199153

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EP06253344A Withdrawn EP1739030A2 (de) 2005-06-30 2006-06-27 Isolierender Karton

Country Status (6)

Country Link
US (1) US20070023153A1 (de)
EP (1) EP1739030A2 (de)
JP (1) JP2007009399A (de)
CN (1) CN1891905A (de)
BR (1) BRPI0602364A (de)
CA (1) CA2549332A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009052542A1 (de) * 2007-10-24 2009-04-30 Peter Steiner Eps-behälter
US8541074B2 (en) 2009-05-05 2013-09-24 Meadwestvaco Corporation Packaging materials with enhanced thermal-insulating performance
WO2018220568A1 (en) * 2017-06-01 2018-12-06 Chef Pack, Llc Packaging for a food product

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070151687A1 (en) * 2005-12-30 2007-07-05 Halabisky Donald D Insulating paperboard
CN104928966B (zh) * 2015-06-17 2017-02-01 湖南广信科技股份有限公司 一种纸及纸板的干燥工艺
CN107635773A (zh) * 2015-10-13 2018-01-26 刘志华 保温纸板复合机及复合方法、保温纸板制作系统
JP6958713B2 (ja) * 2017-12-19 2021-11-02 王子ホールディングス株式会社 発泡断熱紙容器用紙基材、発泡断熱紙容器用シートおよび発泡断熱紙容器
JP6809445B2 (ja) * 2017-12-19 2021-01-06 王子ホールディングス株式会社 発泡断熱紙容器用紙基材、発泡断熱紙容器用シートおよび発泡断熱紙容器
JP6904237B2 (ja) * 2017-12-19 2021-07-14 王子ホールディングス株式会社 発泡断熱紙容器用紙基材、発泡断熱紙容器用シートおよび発泡断熱紙容器
CN111074667B (zh) * 2019-12-26 2022-06-07 宁波亚洲浆纸业有限公司 一种发泡杯用原纸的芯层浆料、制作工艺及发泡杯用原纸
CN111792146B (zh) * 2020-07-08 2022-12-16 山东新思路生活科技有限公司 一种纸杯

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US7108765B2 (en) * 2003-04-04 2006-09-19 Weyerhaeuser Company Method for making an insulating paperboard
US7056563B2 (en) * 2003-04-04 2006-06-06 Weyerhaeuser Company Hot cup made from an insulating paperboard
US7063771B2 (en) * 2003-04-04 2006-06-20 Weyerhaeuser Company Embossed insulating paperboard
US7060159B2 (en) * 2003-04-04 2006-06-13 Weyerhaeuser Company Insulating paperboard

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009052542A1 (de) * 2007-10-24 2009-04-30 Peter Steiner Eps-behälter
US8541074B2 (en) 2009-05-05 2013-09-24 Meadwestvaco Corporation Packaging materials with enhanced thermal-insulating performance
WO2018220568A1 (en) * 2017-06-01 2018-12-06 Chef Pack, Llc Packaging for a food product
CN111032529A (zh) * 2017-06-01 2020-04-17 大厨包装有限公司 食品包装
US10640277B2 (en) 2017-06-01 2020-05-05 Chef Pack, Llc Packaging for a food item
CN111032529B (zh) * 2017-06-01 2022-06-07 大厨包装有限公司 食品包装
US11772871B2 (en) 2017-06-01 2023-10-03 Chef Pack, Llc Packaging for a food product
AU2018275345B2 (en) * 2017-06-01 2023-10-05 Chef Pack, Llc Packaging for a food product

Also Published As

Publication number Publication date
CA2549332A1 (en) 2006-12-30
CN1891905A (zh) 2007-01-10
BRPI0602364A (pt) 2007-02-21
JP2007009399A (ja) 2007-01-18
US20070023153A1 (en) 2007-02-01

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