US20170081061A1 - Twisting paper - Google Patents

Twisting paper Download PDF

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Publication number
US20170081061A1
US20170081061A1 US15/308,572 US201515308572A US2017081061A1 US 20170081061 A1 US20170081061 A1 US 20170081061A1 US 201515308572 A US201515308572 A US 201515308572A US 2017081061 A1 US2017081061 A1 US 2017081061A1
Authority
US
United States
Prior art keywords
paper substrate
paper
waxed
binder
wax
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.)
Abandoned
Application number
US15/308,572
Other languages
English (en)
Inventor
Gilles Gauthier
Alexandra VENOT
Anthony LEMONNIER
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.)
Munksjo Oyj
Original Assignee
Munksjo Oyj
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 Munksjo Oyj filed Critical Munksjo Oyj
Assigned to Munksjö Oyj reassignment Munksjö Oyj ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Lemonnier, Anthony, Venot, Alexandra, GAUTHIER, GILLES
Publication of US20170081061A1 publication Critical patent/US20170081061A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/004—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material in blanks, e.g. sheets precut and creased for folding
    • 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
    • B65D65/02—Wrappers or flexible covers
    • 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
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/26—Articles or materials wholly enclosed in laminated sheets or wrapper blanks
    • 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
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/60—Containers, packaging elements or packages, specially adapted for particular articles or materials for sweets or like confectionery products
    • 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
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • 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
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
    • 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
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • 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
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675—Oxides, hydroxides or carbonates
    • 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
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • D21H19/72—Coated paper characterised by the paper substrate
    • D21H19/76—Coated paper characterised by the paper substrate the substrate having specific absorbent properties
    • D21H19/78—Coated paper characterised by the paper substrate the substrate having specific absorbent properties being substantially impervious to the coating
    • 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
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/60—Waxes
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters

Definitions

  • the present invention relates to paper wrapping applications.
  • the invention relates more particularly to paper used for wrapping individual food products such as pieces of candy.
  • twisting paper Such paper is usually referred to as twisting paper and must be able to withstand the twisting involved in the high speed wrapping operation without tearing.
  • U.S. Pat. No. 4,842,187 discloses an opaque biaxially drawn oriented thermoplastic film.
  • Opacity is one of the most important property in paper wrapping applications such as confectionery. Opaque wrapping enables to hide the wrapped product.
  • Opacifying additives are added in the paper to achieve high levels of opacity of the paper wrapping.
  • Application FR 2 685 704 A1 describes the use of TiO 2 particles as opacifying additive.
  • the present invention provides a twisting paper substrate to be waxed for the production of an opaque waxed paper wrapping, wherein the paper substrate comprises a fibrous base, at least one opacifying additive and at least one binder notably reducing penetration of wax in the fibrous base during the production of the waxed paper substrate by application of wax on the paper substrate, notably wherein the difference of opacity of the paper substrate before and after Cobb test according to the rizinus Cobb method on one side to be waxed of the paper substrate is most preferably less than or equal to 8 percent.
  • This difference of opacity may notably be less than or equal to 5 percent.
  • the binder leads to a decrease of wax penetration in the fibrous base during the production of the waxed paper substrate by application of wax on the paper substrate.
  • less wax is needed, which leads to an increase of the opacity of the waxed paper substrate.
  • Less opacifying additive is added in the paper substrate to achieve a given level of opacity of the waxed paper substrate, which reduces costs. Additional cost reduction is achieved thanks to the reduction of the wax amount.
  • the reduction of the wax amount may make it easier to claim paper compostability and the waxed paper may be considered as mono-material thus decreasing the green dot fees.
  • the wax reduction allows a better runnability on waxing machines due to the possibility to run faster and with a more stable process.
  • Another aspect of the invention relates to a waxed paper wrapping, comprising the paper substrate according to the invention and a coating of wax on at least one side of the paper substrate.
  • a further object of the present invention is a method for producing the paper substrate according to the invention, wherein the at least one binder is applied on at least one side, preferably on both sides, of a paper web comprising the fibrous base, preferably using a metered size press.
  • a further object of the present invention is a method for producing a twisting paper substrate to be waxed for the production of an opaque waxed paper wrapping, wherein the paper substrate comprises a fibrous base, at least one opacifying additive and at least one binder reducing penetration of wax in the fibrous base during the production of the waxed paper substrate by application of wax on the paper substrate, wherein the binder is applied on at least one side to be waxed of a paper web comprising the fibrous base.
  • the present invention also provides a method for producing a waxed paper wrapping according to the invention, comprising the production of the paper substrate according to the invention and application of the wax on the paper substrate.
  • the present invention also provides a method for packaging food, comprising twisting around the food a waxed paper wrapping according to the invention.
  • Another aspect of the invention relates to a packaged food product comprising a food product and a waxed paper wrapping according to the invention, twisted around the food product.
  • Opacity according to the invention is the opacity as defined in norm NF Q03-006, expressed in percent.
  • the Cobb test according to the Rizinus Cobb method can be performed, and the opacity on this side before and after the Cobb test according to the Rizinus Cobb method can be measured, as detailed below.
  • Castor oil is applied at ambient temperature (20° C.) on one side to be waxed of the paper substrate according to the Rizinus Cobb method, which consists of the following:
  • the reservoir of the absorbency testing device SFT 03t model from IGT Testing Systems is filled with castor oil.
  • the castor oil is characterized by a density comprised between 0.95 g/cm 3 and 0.97 g/cm 3 , a saponification value comprised between 170 and 190 and an iodine value comprised between 80.0 and 95.0.
  • the paper substrate is placed on the castor oil reservoir, the side of the paper substrate to be tested being orientated downward, in other words towards the oil.
  • the reservoir is closed and maintain with a lid.
  • the reservoir with the paper substrate is returned manually upside down, so that the castor oil is in contact with the paper substrate.
  • the paper substrate and the castor oil reservoir are returned to their initial position: the paper substrate is on the castor oil reservoir.
  • the lid is unblocked but kept in place to maintain the paper substrate on the reservoir.
  • the excess of castor oil on the paper substrate is removed by pulling the paper on the edge of the reservoir.
  • the opacity is measured on the paper substrate before and after the Cobb test according to the Rizinus Cobb method on one side to be waxed.
  • the difference of opacity of the paper substrate before and after the Cobb test according to the Rizinus Cobb method on one side to be waxed of the paper substrate is related to the barrier property of this side of the paper substrate: the lowest this difference of opacity, the strongest the barrier against wax of this side of the paper substrate.
  • the difference of opacity of less than or equal to 8% of the paper substrate before and after the Cobb test according to the Rizinus Cobb method on one side to be waxed may be fulfilled regardless of the side of the paper substrate chosen for the application of the castor oil.
  • the paper substrate may have a basis weight of less than or equal to 60 g/m 2 , preferably less than or equal to 45 g/m 2 , notably less than or equal to 40 g/m 2 following the standard NF EN ISO 536.
  • the paper substrate is preferably a printable paper substrate.
  • the paper substrate may have a surface energy higher than or equal to 25 J/m 2 and preferably higher than or equal to 30 J/m 2 .
  • the paper substrate may be calendered.
  • the Bekk smoothness according to ISO 5627:1995 on one side of the paper substrate may range between 1300 s and 2500 s, or even lower than 1300 s as long as the printability is good.
  • the paper substrate comprises a fibrous base.
  • the fibrous base may have of origin wood pulp, non-wood fibers, natural pulp, synthetic fibers, semi synthetic fibers or a mix of any of them.
  • the paper may comprise hardwood fibres and softwood fibres, for example between 60 and 70% of softwood fibres and between 30 and 40% of hardwood fibres.
  • the paper substrate comprises at least one opacifying additive.
  • the at least one opacifying additive may comprise a pigment, the pigment preferably having a high refractive index, in particular higher than or equal to 2.30.
  • the at least one opacifying additive comprise preferably TiO 2 or zinc sulfide, most preferably TiO 2 .
  • TiO 2 may be anatase titanium dioxide or rutile titanium dioxide, preferably rutile titanium dioxide.
  • the paper substrate comprises at least one binder, for example only one or a mixture of different binders.
  • the at least one binder is preferably located near the surface of the paper substrate.
  • the at least one binder is a water soluble binder.
  • the at least one water soluble binder may be selected from PVOH or starch, preferably from PVOH.
  • the paper substrate may comprise PVOH and starch
  • the at least one binder is a water insoluble binder.
  • the at least one water insoluble binder may be selected from latex made from polymers and copolymers from several monomers, notably styrene, butadiene, acrylic esters, vinyl acetate, and acrylonitrile.
  • the paper substrate may comprise latex made from polymers and copolymers from several monomers, notably styrene, butadiene, acrylic esters, vinyl acetate, and acrylonitrile.
  • the paper substrate may comprise a mixture of water soluble and water insoluble binders.
  • the binder(s) may be part of a surface coating composition which is applied on at least one side to be waxed, preferably on both sides to be waxed, of a paper web comprising the fibrous base, during the production of the paper substrate.
  • the surface coating composition may be applied on one side to be waxed of the paper web in an amount of less than or equal to 5 g/m 2 , preferably less than or equal to 3 g/m 2 , in dry weight.
  • the side to be waxed on which the surface coating composition is applied may be chosen indifferently.
  • the surface coating composition may be applied on both sides to be waxed of the paper web in an amount of less than or equal to 5 g/m 2 per side, preferably less than or equal to 3 g/m 2 per side, in dry weight.
  • the paper substrate may comprise binder(s) between 1 to 20%, preferably 1 to 10%, in dry weight relative to dry weight of paper substrate. It may represent 40 to 90% in dry weight of binder(s) in the surface coating composition containing said binder(s).
  • the paper substrate may comprise at least one softening agent.
  • the one or more softening agent are useful to maintain high moisture content associated with flexibility to enhance twisting without breaks nor tears during packaging after waxing.
  • the at least one softening agent preferably penetrates to the core of the paper substrate.
  • the at least one softening agent may be selected from, but not limited to, urea, nitrate, notably sodium nitrate, a mixture of urea and sodium nitrate, or an organic plasticizer such as sorbitol, sorbitol ether, polyethylene glycol or glycerol, the at least one softening agent being preferably a mixture of urea and sodium nitrate.
  • the paper substrate may comprise two or more softening agents, preferably selected from urea, nitrate, notably sodium nitrate, a mixture of urea and sodium nitrate, or an organic plasticizer such as sorbitol, sorbitol ether, polyethylene glycol or glycerol.
  • softening agents preferably selected from urea, nitrate, notably sodium nitrate, a mixture of urea and sodium nitrate, or an organic plasticizer such as sorbitol, sorbitol ether, polyethylene glycol or glycerol.
  • the surface coating composition containing the binder(s) may also comprise the softening agent(s).
  • the paper substrate may comprise softening agent(s) in an amount between 0.2 to 15%, preferably 0.5 to 5%, in dry weight relative to dry weight of paper substrate. It may represent 10 to 50% in dry weight of softening agent(s) in the surface coating composition containing said softening agent(s).
  • the paper substrate may comprise at least one additional additive.
  • the at least one additional additive may be a rheology modifier, preferably a carboxymethyl cellulose.
  • the at least one additional additive may be an insolubilizing agent.
  • the paper substrate may comprise both rheology modifier and insolubilizing agent.
  • the surface coating composition containing the binder(s) may also comprise the other additive(s).
  • the at least one binder may be applied on at least one side to be waxed, preferably on both sides to be waxed, of a paper web comprising the fibrous base, preferably using a metered size press.
  • the at least one binder may be applied on at least one side to be waxed, preferably on both sides to be waxed, of a paper web comprising the fibrous base, using a size press.
  • the at least one opacifying additive may be mixed to the fibrous base before formation of the paper web.
  • the at least one softening agent may be applied on at least one side to be waxed, preferably on both sides to be waxed, of the paper web, preferably using a metered size press.
  • the at least one softening agent may be applied on at least one side to be waxed, preferably on both sides to be waxed, of the paper web, using a size press.
  • the at least one softening agent and the at least one binder may be applied on at least one side to be waxed, preferably on both sides to be waxed, of the paper web at the same step or at different steps, preferably at the same step.
  • the at least one softening agent and the at least one binder may have different properties, the softening agent penetrating to the core of the paper substrate and the binder remaining near the surface of the paper substrate, it has been surprisingly found that it is possible to apply them on at least one side to be waxed, preferably on both sides to be waxed, of the paper web at the same step.
  • the size press or the metered size press enables in particular to apply the at least one binder and/or the at least one softening agent on one or both sides to be waxed of the paper web at high speed.
  • the paper substrate is a twisting paper substrate.
  • a twisting paper substrate according to the invention is a paper substrate having a cross-direction (CD) elongation according to ISO 1924 higher than or equal to 7.5%, a machine direction (MD) tear resistance according to ISO 1974 higher than or equal to 200 mN, a CD tear resistance higher than or equal to 220 mN and a stiffness according to ISO 2493 (15° 5 mm) not higher than or equal to 40 mN in the MD and not higher than or equal to 20 mN in the CD.
  • CD cross-direction
  • MD machine direction
  • the twisting paper substrate according to the invention has suitable deformation and resistance capacity for absorbing torsion energy during packaging without being torn. This can be described as paper twistability.
  • Twisting paper substrates according to the invention are able to match compromise between barrier and twistability.
  • Barrier properties against wax are notably brought by the at least one binder and twistability is notably brought by the at least one softening agent.
  • twisting papers can give good twistability due to high flexibility and special surface treatments but wax penetration is out of control due to broadly opened surface.
  • the paper substrate may be used for confectionery applications, notably sweets twisting application.
  • the wax may be a hydrocarbon wax. It may be extracted and refined from petroleum, resulting in for example paraffin, or derived from gas synthesis, resulting in a synthetic wax.
  • the wax may be a vegetable wax. It may be fatty and derivated from palm oil, soy oil and rapeseed.
  • the production of the waxed paper wrapping comprises the production of the paper substrate according to the invention and the application of wax on at least one side, preferably on both sides, of the paper substrate.
  • the waxed paper wrapping comprises the paper substrate according to the invention and a coating of wax on at least one side of the paper substrate, preferably on both sides.
  • the waxed paper wrapping may consist of the paper substrate according to the invention and the coating of wax on one side or on both sides of the paper substrate.
  • the paper substrate may be remoistered, notably with a blend comprising water, glycerol and sorbitol, before wax application
  • Wax may be present on at least one side of the paper substrate, forming one layer on the application side of the paper substrate and penetrating at least partially in the fibrous base.
  • Wax may be present on both sides of the paper substrate, forming one layer on each side of the paper substrate and penetrating at least partially in the fibrous base.
  • At least one side of the paper substrate may be printed before application of wax.
  • the waxed paper wrapping may comprise at least one printed mark on the paper substrate and under the wax layer.
  • the waxed paper wrapping may consist of the paper substrate according to the invention, the coating of wax on one side or on both sides of the paper substrate and one or more printed marks on the paper substrate and under the coating of wax.
  • the waxed paper wrapping preferably does not comprise any additional layer on the paper substrate which has the property to reinforce the barrier against wax.
  • an additional treatment independent of the potential printing step, can be performed to improve a property other than the barrier against wax, such as for example twistability.
  • the wax quantity in the fibrous base may be less than or equal to 7 g/m 2 , preferably less than or equal to 5 g/m 2 , preferably less than or equal to 4 g/m 2 when the wax is applied on both sides of the paper substrate.
  • the wax quantity in the fibrous base may be less than or equal to 4 g/m 2 , preferably less than or equal to 3 g/m 2 , better to 2.5 g/m 2 , even better to 2.0 g/m 2 and even better to 1.5 g/m 2 , when the wax is applied on one side of the paper substrate.
  • Such a low wax quantity enables to give relevant cost advantages, environmental advantages with easier compostability, and more stable processes.
  • the difference of opacity between the paper substrate, before application of wax, and the waxed paper wrapping may be less than or equal to 10%, preferably less than or equal to 5%, notably less than or equal to 3%
  • Opacity is measured in an unprinted area of the waxed paper wrapping.
  • the packaged food product comprises a food product and a waxed paper wrapping according to the invention, twisted around the food product.
  • the waxed paper wrapping may be twisted in at least one turn around the food product.
  • the food product is preferably entirely wrapped in the waxed paper wrapping.
  • the food product may be a confectionery food product, such as a sweet.
  • the fibrous base is a standard fibrous base used for confectionery application which main characteristics are presented in table 1.
  • Fibrous base characterization Fibrous base Standard AVG SD Basisweight (g/m 2 ) ISO 536-1995 E 40.4 0.1 Tear MD mN ISO 1974-1990 E 302 10 Tear CD mN 298 11 Stiffness MD mN ISO 2493-1: 2010 41.1 6.2 (15°-5 mm) ISO 5628-1990 E Stiffness CD mN 20.1 2.5 (15°-5 mm) Breaking length MD Km ISO 1924-2-1994 6.81 0.53 Breaking length CD Km 2.42 0.30 Elongation MD % NF EN ISO 1924-2-1994 3.7 0.1 Elongation CD % 9.6 0.7
  • a size press has been used to apply the surface treatments on the fibrous bases.
  • the conditions were the following: 2 presses at 25 PJ hardness and 4 bars pressure in the nip. Speed was 40 m/min with oven set at 140° C.
  • Coatweight is about 2 g/m 2 total dry weight on both sides of each fibrous base.
  • Table 3 presents the main paper characteristics of these two paper substrates.
  • Both paper substrates are twisting paper substrate according to the invention (see table 3 tear, elongation and stiffness values).
  • SP coating according to the invention can provide high barrier property to paper while SP-2 is not giving the expected barrier level (see delta opacity after rizinus cobb values of table 3)
  • the quantity of wax that is applied ranges between 7 and 8.5 g/m 2 in dry weight.
  • Table 4 presents wax coatweights measured inside papers. SP-1 is showing a wax saving of 33% compared to SP-2.
  • the amount of TiO2 present in the paper substrate was the same in both cases, and equal to 3.5% of the weight of paper substrate but the difference of opacity before and after waxing is much lower with SP-1 coating, which is a different way to prove lower wax penetration thanks to wax barrier provided by SP-1 coating.
  • coating SP-1 is able to provide suitable barrier to save quantity of wax applied on twisting paper substrates according to the invention.
US15/308,572 2014-05-02 2015-04-30 Twisting paper Abandoned US20170081061A1 (en)

Applications Claiming Priority (3)

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EP14305656.2 2014-05-02
EP14305656.2A EP2940211B1 (en) 2014-05-02 2014-05-02 Twisting paper
PCT/IB2015/053162 WO2015166452A1 (en) 2014-05-02 2015-04-30 Twisting paper

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CN110219208B (zh) * 2019-06-10 2021-08-10 万邦特种材料股份有限公司 一种高效扭结折叠式糖果包装原纸的生产工艺
IT201900012516A1 (it) * 2019-07-22 2021-01-22 Muto 1920 S R L Procedimento per la produzione di carta riciclabile impermeabile alla cera, in particolare per la realizzazione di involucri impermeabili ecocompatibili per ceri votivi

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RU2668916C2 (ru) 2018-10-04
ES2688040T3 (es) 2018-10-30
ZA201607593B (en) 2018-04-25
EP2940211A1 (en) 2015-11-04
CN106574447B (zh) 2019-12-13
EP2940211B1 (en) 2018-07-11
WO2015166452A1 (en) 2015-11-05
PL2940211T3 (pl) 2019-03-29
RU2016142897A3 (es) 2018-07-31
RU2016142897A (ru) 2018-06-05

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