WO1996017789A1 - Recipients paraffines recyclables - Google Patents

Recipients paraffines recyclables Download PDF

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Publication number
WO1996017789A1
WO1996017789A1 PCT/US1994/014127 US9414127W WO9617789A1 WO 1996017789 A1 WO1996017789 A1 WO 1996017789A1 US 9414127 W US9414127 W US 9414127W WO 9617789 A1 WO9617789 A1 WO 9617789A1
Authority
WO
WIPO (PCT)
Prior art keywords
wax
paper product
carbon atoms
coated
melting point
Prior art date
Application number
PCT/US1994/014127
Other languages
English (en)
Inventor
Jyh-Yee Lan
Teresa A. Krug
Original Assignee
The Mead Corporation
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 The Mead Corporation filed Critical The Mead Corporation
Priority to PCT/US1994/014127 priority Critical patent/WO1996017789A1/fr
Priority to AU13039/95A priority patent/AU1303995A/en
Publication of WO1996017789A1 publication Critical patent/WO1996017789A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/18—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising waxes
    • 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
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/42—Applications of coated or impregnated materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/60—Waxes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • the invention is directed to improved wax-coated containers and, more particularly, to wax-coated paperboard containers which are capable of being recycled under standard repulping conditions in a hydropulper without significantly increasing the repulping temperature or pH.
  • Wax-coated containers particularly wax-coated corrugated paperboard containers have been used for years to ship and store fresh, perishable foods such as poultry, fish and meat. Typically, the containers are packed with crushed ice to keep the food cool during shipping and storage. The wax imparts water and moisture resistance to the containers. Examples of wax-coated or wax-impregnated paperboard containers are described in U.S. Patents
  • the paperboard may be impregnated with about 6 pounds per 1,000 square feet of a wax blend and then curtain coated with an additional 6.5 pounds per 1,000 square feet of wax blend.
  • the wax-coated paperboard of the present invention is designed to be repulped using a hydropulper at a temperature greater than about 130°F and preferably about 140 to 145°F and pH equal to or greater than about 6.5.
  • the wax-coated products in accordance with the present invention are prepared using a was composition which comprises a paraffin wax having a melting point of about 130 to 160 C F and a viscosity of 20 to 200 cps at 10 ⁇ F above its melting point, a fatty acid having about 8 to 24 carbon atoms, and microcrystalline wax which melts at a temperature less than about about 180°F and preferably less than 160°F.
  • This composition is desirable for use in making wax-coated paper products for two reasons in particular. First, it can be removed from the basestock in a hydropulper under standard operating procedures such that the fiber in the basestock can be recycled, and, second, its viscosity is such that the wax can be applied to the basestock by spray coating.
  • the present invention is principally directed to wax-coated containers prepared from paperboard. However, those skilled in the art will appreciate that the invention may be useful in preparing any wax-coated paper product where ease of recyclability is desired including milk containers.
  • the containers of the invention are designed primarily for use in shipping and storing perishable food items such as poultry, meat and fish.
  • the containers of the present invention are conventional with the exception of the wax coating and the coating technique.
  • the wax composition used in the present invention incorporates a paraffin (macrocrystalline) wax having a melting point of about 130 to 160°F and preferably about 140°F, a viscosity of about 10 to 200 and preferably about 20 cps at 10°F above the melting point and is preferably ash-free, i.e., contains little or no fillers.
  • the paraffin wax is preferably further characterized as comprising a mixture of paraffins ranging from about 20 to 45 carbon atoms and preferably about 20 to 40 carbon atoms with at least about 60 wt. % of the mixture containing waxes having about 25 to 32 carbon atoms and more preferably 26 to 30 carbon atoms.
  • Suitable waxes include Ecco Wax 244 commercially available from Eastern Color and Chemical Company, Buffalo, RI, and Boler Wax 1977.
  • a particularly preferred wax is Ecco Wax 244.
  • the wax may be used alone but it is preferably used in combination with a fatty acid.
  • the wax composition further includes a wax which is characterized as a microcrystalline wax which is flexible and melts at a temperature less than about 180 ⁇ F. This wax is selected such that it is compatible with the paraffin wax and the temperatures used in the hydropulper.
  • the microcrystalline wax used in the preferred embodiment has a wide melting range from about 85°F to 160 ⁇ F.
  • the wax Preferably no more than about 15% of the wax, still more preferably no more than about 10% and most preferably no more than about 5-6% of the wax melts at a temperature less than about 100°F. If the wax contains substantially higher amounts of these low melting components, blocking may occur.
  • the wax may be further characterized in that no more than about 10% and preferably no more than about 4-5% of the wax melts at a temperature greater than about 150 ⁇ F. Most preferably, about 75% to 90% of the microcrystalline wax melts in the range of about 100 ⁇ F to 150°F.
  • a useful microcrystalline wax is Bowax 1018. Other microcrystalline waxes which melt in about the same temperature range as the paraffin wax described above should also be useful in the present invention.
  • the third component of the wax composition is the fatty acid.
  • Useful fatty acids are saturated or unsaturated fatty acids having about 8 to 22 carbon atoms. Examples of fatty acids useful in the invention include stearic acid, palmitic acid, myristic acid, lauric acid, capric acid, caprylic acid, arachidic acid, behenic acid, oleic acid, linoleic acid, etc.
  • the preferred fatty acids include stearic acid, palmitic acid and myristic acid. Most preferably, the fatty acid is stearic acid.
  • the amount of the fatty acid will vary with the amount of water resistance desired in the product and its repulpability.
  • the upper limit on the amount of fatty acid contained in the wax composition is dependent upon the water resistance desired. As the concentration of the fatty acid increases the water resistance of the coating tends to be reduced.
  • the wax composition may contain up to about 30% fatty acid, preferably about 5 to 20% and most preferably about 10%.
  • the fatty acid is believed to function as a wax- compatible soap precursor which forms a salt of the fatty acid upon the addition of a base such as an alkali or alkaline earth metal hydroxide or salt to adjust the pH during the repulping of the corrugated paperboard containers in the hydropulper.
  • a base such as an alkali or alkaline earth metal hydroxide or salt
  • some of the wax used in carrying out the invention when used in conjunction with the fatty acid during repulping produces small wax particles which become interspersed among the fibers and acts as an internal sizing agent in the recycled sheet.
  • other conventional waxes which fall outside the above characterization description provide larger particles which may interfere with fiber-to-fiber bonding or hydrogen bonding and therefore reduce the strength of the repulped product.
  • the particular wax material present in the highest concentration in the composition dictates the melting point of the composition.
  • the observed melting point of the composition is at or near 140 ⁇ F, i.e., the melting point of the Ecco wax which is present in the composition at the higher concentration.
  • the wax present in the highest concentration may behave as a solvent for the wax present in the lesser concentration and that the melting point of the composition is determined similar to the melting point of other solutions as contrasted with other mixtures which yield melting points which are closer to the average melting point of the constituents.
  • the paraffin wax will be present in an amount greater than the amount of the microcrystalline wax.
  • the paraffin wax is present in an amount greater than 50%, preferably about 55-60% and most preferably about 60%.
  • a highly preferred wax composition is one which contains about 60% Ecco wax 244, 25 to 35% Bowax 1018 and 5 to 15% fatty acid.
  • the containers of the present invention are typically paperboard made up of two sheets of liner board having a corrugated media sandwiched therebetween.
  • the corrugated media is usually impregnated with the wax composition by immersing the media in a bath of the melted wax and the liner board is usually coated on one or both sides with the wax composition.
  • wax coatings have typically been applied to the liner board using a curtain coater, however, due to the low viscosity of the wax composition of the present invention, it may be preferred to use a spray coating technique. Spray coating may enable coating of both sides of the basestock simultaneously and also enable the use of lesser amounts of the coating thereby providing an economical advantage over the prior art coatings. Additives which increase the viscosity of the wax may also be employed if it is desired to use curtain coating.
  • the wax-containing composition is applied at an average amount of about 5 pounds per 1,000 square feet. More precisely, the internal corrugated media is impregnated with the wax composition at a coat weight of about 3 to 5 pounds per 1,000 square feet and the interior liner of the corrugated media is generally coated with the wax composition at a coat weight of about 5 to 6 pounds of wax composition per 1,000 square feet.
  • the coat weight is typically a function of a cost versus ' water-resistance balance.
  • the wax composition used in the present invention in coating the corrugated paperboard containers is especially attractive because, unlike prior waxes, it allows the wax-coated container to be recycled using a hydropulper at standard pulping conditions which include a temperature of about 130 to 160°F and a neutral or alkaline pH (e.g., greater than about 6.5).
  • a neutral or alkaline pH e.g., greater than about 6.5.
  • Any alkaline pH can be used to repulp the container, however, for compatibility with industrial operations, a pH of less than about 9.0 is preferred and a pH of less than about 8.0 is most preferred.
  • Excellent results have been achieved with a wax composition of Ecco Wax 244 and stearic acid at a pH of 6.5. Removal of the wax is evident when the repulping water turns milky.
  • Two sheets of corrugated liner board were prepared by hand-drawdown using the following compositions: (1) 60% Ecco Wax 244, 30% Bowax 1018 and 10% stearic acid, and (2) 80% Ecco Wax 244 and 20% stearic acid.
  • the compositions were allowed to set and then evaluated for the properties shown in Table 1. WVTR and Fiber Recovery were measured in a conventional manner.
  • Cleanness was evaluated by sandwiching each of the hand sheet between two sheets of blotter paper and heating to 250 P F. The surface of the sheets were then visually inspected for wax deposits.
  • the corrugated board broke along the fold liner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un produit en papier paraffiné recyclable comprenant un support papier revêtu d'une composition de cire contenant un mélange d'une cire de paraffine présentant un point de fusion d'environ 130 °F à 160 °F et une viscosité d'environ 10 à 200 cps à 10 °F au-dessus des points de fusion, un acide gras possédant environ 8 à 24 atomes de carbone et une cire microcristalline fondant à une température inférieure à environ 180 °F, ainsi qu'un procédé pour recycler les récipients préparés à partir de ce produit.
PCT/US1994/014127 1994-12-07 1994-12-07 Recipients paraffines recyclables WO1996017789A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US1994/014127 WO1996017789A1 (fr) 1994-12-07 1994-12-07 Recipients paraffines recyclables
AU13039/95A AU1303995A (en) 1994-12-07 1994-12-07 Recyclable wax-coated containers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1994/014127 WO1996017789A1 (fr) 1994-12-07 1994-12-07 Recipients paraffines recyclables

Publications (1)

Publication Number Publication Date
WO1996017789A1 true WO1996017789A1 (fr) 1996-06-13

Family

ID=22243370

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/014127 WO1996017789A1 (fr) 1994-12-07 1994-12-07 Recipients paraffines recyclables

Country Status (2)

Country Link
AU (1) AU1303995A (fr)
WO (1) WO1996017789A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29807443U1 (de) 1998-04-24 1998-08-20 Hermann Nawrot GmbH Spezialpapier- und Folienwerk, 51688 Wipperfürth Verpackungsmaterial
EP0890677A1 (fr) * 1997-07-10 1999-01-13 Ucb, S.A. Pellicule cellulosique destinée à l'emballage de produits à taux d'humidité élevé

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429150A (en) * 1944-11-14 1947-10-14 Standard Oil Dev Co Petroleum wax coating composition
US3629171A (en) * 1969-05-09 1971-12-21 Atlantic Richfield Co Wax compositions containing an ethylene-vinyl acetate copolymer and organic acid and a butyl rubber
US3891497A (en) * 1973-03-22 1975-06-24 Beloit Corp Non-aqueous defiberizing process of waste paper in the presence of steam and a liquid nonmiscible in water, e.g., tetrachlorethylene
US4117199A (en) * 1976-09-27 1978-09-26 Oji Paper Co., Ltd. Process for producing moisture and water-proof paper
US5084135A (en) * 1990-03-27 1992-01-28 Advanced Environmental Recycling Technologies, Inc. Recycling plastic coated paper product waste

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429150A (en) * 1944-11-14 1947-10-14 Standard Oil Dev Co Petroleum wax coating composition
US3629171A (en) * 1969-05-09 1971-12-21 Atlantic Richfield Co Wax compositions containing an ethylene-vinyl acetate copolymer and organic acid and a butyl rubber
US3891497A (en) * 1973-03-22 1975-06-24 Beloit Corp Non-aqueous defiberizing process of waste paper in the presence of steam and a liquid nonmiscible in water, e.g., tetrachlorethylene
US4117199A (en) * 1976-09-27 1978-09-26 Oji Paper Co., Ltd. Process for producing moisture and water-proof paper
US5084135A (en) * 1990-03-27 1992-01-28 Advanced Environmental Recycling Technologies, Inc. Recycling plastic coated paper product waste

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0890677A1 (fr) * 1997-07-10 1999-01-13 Ucb, S.A. Pellicule cellulosique destinée à l'emballage de produits à taux d'humidité élevé
BE1011271A3 (fr) * 1997-07-10 1999-07-06 Ucb Sa Pellicule cellulosique destinee a l'emballage de produits a taux d'humidite eleve.
DE29807443U1 (de) 1998-04-24 1998-08-20 Hermann Nawrot GmbH Spezialpapier- und Folienwerk, 51688 Wipperfürth Verpackungsmaterial

Also Published As

Publication number Publication date
AU1303995A (en) 1996-06-26

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