EP4700176A1 - Paper, coated paper, use thereof, paper packaging and methods - Google Patents

Paper, coated paper, use thereof, paper packaging and methods

Info

Publication number
EP4700176A1
EP4700176A1 EP24809873.3A EP24809873A EP4700176A1 EP 4700176 A1 EP4700176 A1 EP 4700176A1 EP 24809873 A EP24809873 A EP 24809873A EP 4700176 A1 EP4700176 A1 EP 4700176A1
Authority
EP
European Patent Office
Prior art keywords
paper
packaging
weight
iso
coated
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.)
Pending
Application number
EP24809873.3A
Other languages
German (de)
French (fr)
Inventor
Fernanda Caciatori BELINI
Karen MARABEZI
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.)
Suzano SA
Original Assignee
Suzano SA
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
Priority claimed from BR102023009779-0A external-priority patent/BR102023009779A2/en
Application filed by Suzano SA filed Critical Suzano SA
Publication of EP4700176A1 publication Critical patent/EP4700176A1/en
Pending legal-status Critical Current

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
    • 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
    • D21H17/20—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
    • 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
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/22—Polyalkenes, e.g. polystyrene
    • 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
    • D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • 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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Wrappers (AREA)

Abstract

The present invention relates to a paper comprising short fibres and a mineral filler. The paper of the present invention has good mechanical properties, good printability and recyclability. A coated paper is also described, comprising the paper of the invention and a barrier composition. Coated paper also has good sealing properties and a grease barrier. Paper packaging comprising the paper or coated paper of the present invention is also disclosed, wherein the packaging is biodegradable and compostable. The use of paper or coated paper for application in primary and secondary flexible packaging is also described. A method for obtaining the paper and a method for manufacturing the coated paper of the present invention are also disclosed.

Description

    FIELD OF THE INVENTION
  • The present invention relates to a paper comprising short fibers and a mineral load. The paper of the present invention has good mechanical properties, good printability, and recyclability. A coated paper comprising the paper of the invention and a barrier composition is also described. The coated paper also provides good sealing and barrier against fat. Paper packaging comprising the paper or coated paper of the present invention is also disclosed, wherein the packaging is biodegradable and compostable. The use of paper or coated paper for application in primary and secondary flexible packaging is also described. A method for obtaining the paper and a method for manufacturing the coated paper of the present invention are also disclosed.
    • BACKGROUND OF THE INVENTION
  • Paper packaging is permeable to oils, fats, gases, water and other liquids. Oil and fat permeation compromises the external appearance of the packaging, making it oily and sticky. This permeation also interferes with material properties, such as rigidity, delamination strength, and thermal sealing strength, among others. On the other hand, the contact of oxygen with some products may cause a series of undesirable changes, such as producing unpleasant aromas, losing nutritional value, and changing colors, aroma, and flavor. Thus, a packaging with good oxygen barrier features is necessary for producing products sensitive to such gas.
  • In this context, it is common to coat or treat paper to present barrier properties, which are essential for packaging products that require protection, such as food or pharmaceutical products.
  • Plastic-based paper coatings are commonly used. Polyolefin coatings are often used as liquid barrier layers, heat sealing layers, and adhesives. Furthermore, styrene-acrylic and styrene-butadiene-based resins are currently available on the market for application on paper, which provide sealing and barrier properties. However, recycling this type of plastic-coated paper product is difficult, as separating polymers from fibers is difficult.
  • Although there is a market trend toward replacing plastic with paper, this substitution in flexible packaging is associated with significant challenges. Plastic has good elongation properties, flexibility, tensile strength, and it does not tear easily. Paper, on the other hand, behaves completely differently.
  • In this sense, the papers currently marketed are papers with low mechanical strength, such as: Tear strength MD (machine direction) and CD ( cross direction) - some use long fiber to improve this property - MD and CD tensile strength, MD and CD elongation strength, and burst strength. Another disadvantage of currently marketed papers is that they are thicker than plastic films, which makes it impossible to shape the final packaging, causing fiber cracks and consequently loss of strength and barriers when polymeric material is applied to provide sealing and barrier properties, wherein the base paper alone does not present said properties.
  • Therefore, there is a need to manufacture paper with good mechanical properties, especially one that is applicable to machinery already commonly used with plastics, in order to avoid large investments in industrial plants.
  • With the aim of replacing plastic packaging with paper packaging, a biodegradable and compostable paper with good mechanical properties, as well as good sealing and barrier against fat when coated, was developed herein. The paper developed herein comprises a significant amount of renewable source material (natural fibers) and can be applied in various processes.
    • SUMMARY OF THE INVENTION
  • A paper comprising fibers and a mineral load is described herein. The paper of the present invention comprises about 60% by weight to about 95% by weight of short fibers and about 2% by weight to about 15% by weight of mineral load, wherein the % by weight is based on the total weight of the paper.
  • In one embodiment of the invention, the fibers are natural fibers, preferentially cellulose fibers.
  • In one embodiment of the invention, the mineral load is selected from the group consisting of precipitated calcium carbonate (PCC), ground calcium carbonate (GCC), talc, and mixtures thereof.
  • In one embodiment of the invention, the paper further comprises other components, such as modified starch, an internal bonding agent (e.g., alkenyl succinic anhydride), and/or a surface bonding agent (e.g., alkyl ketene dimer).
  • In one embodiment of the invention, the paper presents a grammage of about 30 g/m2 to about 110 g/m2; and/or thickness of about 30 µm to about 120 µm. The grammage was measured according to the ISO 536 standard and the thickness was measured according to the ISO 534 standard.
  • A coated paper comprising the paper of the present invention and a barrier composition is also described herein.
  • In an optional embodiment of the invention, the barrier composition comprises a sealing agent, a bio-binding agent, and an anti-blocking agent.
  • In one preferred embodiment of the invention, the sealing agent is polyvinyl alcohol (PVOH); the bio-binding agent is a starch or a formulation comprising starch; and the antiblocking agent is calcium stearate.
  • In an optional embodiment of the invention, the barrier composition comprises about 25% by weight to about 45% by weight of solids content, wherein the % by weight is based on the dry weight of the barrier composition. The solids content was measured using a drying oven or a moisture balance.
  • In one embodiment of the invention, the coated paper has a grammage of about 40 g/m2 to about 120 g/m2; and/or thickness of about 40 µm to about 130 µm. The grammage was measured according to the ISO 536 standard and the thickness was measured according to the ISO 534 standard.
  • Flexible paper packaging comprising the paper or coated paper of the present invention are also described herein.
  • In one embodiment of the invention, the flexible paper packaging serves as food packaging or as a coating for pharmaceutical compositions.
  • The flexible paper packaging of the invention can be flowpack, flat bottom, stand-up pouch (SUP), wrap, 3-seal, 4-seal, SOS, and other types.
  • The use of the paper or coated paper of the present invention for application in primary and secondary flexible packaging is also described herein.
  • In a preferred embodiment of the invention, the use is for application in flexible food packaging or coating packaging for pharmaceutical compositions.
  • In one embodiment of the invention, the use is for application by means of vertical, horizontal, SOS filling machines, among others.
  • A method for obtaining the paper of the invention, comprising (a) refining the fibers, (b) adding modified starch, (c) adding an internal bonding agent, (d) adding the mineral load, (e) optionally adding a surface bonding agent, and (f) adding a natural polymer on the surface plus a second surface bonding agent is also described herein.
  • A method for manufacturing coated paper, comprising applying from about 2 g/m2 to about 20 g/m2, according to the ISO 536 standard, of a barrier composition onto a paper of the present invention by means of reverse engraving, shank, blade, engraved roller, air knife, curtain coating, or printer systems is also described herein. The barrier composition can be applied to either the felt side or the mesh side of the base paper.
    • DEFINITIONS
  • The definitions of some terms/expressions used herein are presented herein.
  • The term "fiber," as used herein, means an elongated particulate having an apparent length that considerably exceeds its apparent width.
  • "Short fibers," as used herein, are fibers with a length of less than 2 mm.
  • The term "barrier," as used herein, refers to the ability of a product, for example, packaging, to resist the passage of fat. The barrier properties of a package should not be confused with its chemical strength, which is associated with the ability not to be solubilized, altered, or softened when in contact with an agent. However, a package's barrier features are closely related to the chemical, physical, sensorial, microbiological, and biological stability of the products.
  • The term "sealing" refers to polymer fusion under heat and pressure application during the filling of the final product.
  • A "primary packaging" is the packaging that is in direct contact with the product. A "secondary packaging," in turn, is the packaging that protects the primary packaging.
  • The term "biodegradation" is defined as a chemical process in which materials are metabolized into water, carbon dioxide, and biomass with the aid of microorganisms. The biodegradation process depends on environmental conditions, such as, e.g., temperature, inoculum, and humidity, and on the material or its application. In order to assess the product's biodegradability, environmental conditions have to be specified and a biodegradation schedule has to be established in order to make the assessments measurable and comparable. Some examples of standards are EN 13432, ASTM D6400, ASTM, D5338, 15014855, ASTM 5988, ASTM D6003, ASTM G160, ABNT NBR 15448-1, and ABNT NBR 15448-2.
  • The term "composting" is defined as a process controlling biological decomposition and turning biodegradable materials into a humus-like substance called compost. Decomposing biodegradable material results in the production of carbon dioxide, water, minerals and stabilized organic matter (compost or humus). As such, compostable materials are the ones that undergo biodegradation during composting to release CO2, water, inorganic compounds, and biomass at a rate consistent with other known compostable materials, leaving no visible, distinguishable, or toxic residues.
  • Compostable materials, which are designed to be disposed of after use through organic recycling, i.e., composting, represent one of the strategic options available for waste management. Composting is an attractive alternative for reducing solid waste and is especially suitable for conventional plastics segments, in which recycling is difficult or not economically viable.
  • The term "recyclability" refers to the property of paper to have fibers which can be reused to form new paper.
  • The term "grammage" refers to the determination of the mass per unit area of the paper, described in grams per square meter herein.
  • "Tensile strength" refers to the maximum tensile force per unit width that the paper can withstand before breaking. "Tensile index", in turn, refers to the tensile strength divided by the grammage.
  • "Elongation" refers to the increase in length of a test piece.
  • "Burst strength" refers to the maximum pressure developed by the hydraulic system that forces an elastic diaphragm through a circular paper area. "Bursting index", in turn, is the burst strength divided by the grammage.
  • "Tear strength" is the force perpendicular to the plane of the paper required to tear multiple paper sheets through a specified distance after tearing has been initiated. "Tear index", in turn, refers to the tear strength divided by grammage.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • Figure 01 represents the SEM analyses of the front and back surfaces of the paper from example 3 of the invention.
    • Figure 02 represents the SEM analyses of the front and back surfaces of the paper from example 4 of the invention.
    DETAILED DESCRIPTION OF THE INVENTION
  • One of the advantages of the present invention is the replacement of plastic with paper in flexible packaging, such as packaging for flour, rice, and beans. In this context, paper needs to be versatile so that it can replace plastic in a process wherein it is generally used as a raw material, while at the same time obtaining packaging with sealing properties and barrier against fat comparable to or better than packaging using plastic. In this sense, the present invention relates to biodegradable and compostable flexible packaging, comprising paper (coated or uncoated) with good mechanical properties. The flexible packaging developed herein is environmentally friendly, providing a sustainable alternative to common packaging made with plastic.
  • The present invention provides a paper with good strength, which is applicable to machinery already commonly used with plastic, avoiding large investments in industrial plants.
  • The paper of the present invention is composed of fibers and mineral load. An additional advantage of this paper is that it uses only short fibers; that is, 100% of the fibers are short. Based on the knowledge available up to that point, it was expected that the use of only short fibers would confer less strength to the material (for example, paper or packaging comprising the same), however, through the present invention, a paper with improved strength was obtained compared to existing papers containing short fibers and long fibers or only long fibers.
  • In one embodiment of the invention, the paper fibers are natural fibers, which refer to cellulose fibers, cellulose fiber derivatives, wood derivatives, or mixtures thereof, preferentially cellulose fibers. Natural fibers can be virgin, recycled, or secondary natural fibers, preferentially virgin natural fibers.
  • The short fibers included in the paper of the present invention have a length of less than 2 mm.
  • The paper of the present invention comprises from about 60% by weight to about 95% by weight of short fibers, wherein the % by weight is based on the total weight of the paper.
  • The paper of the present invention comprises, in addition to short fibers, about 2% by weight to about 15% by weight, preferentially about 6% by weight to about 8% by weight of mineral load, wherein the % by weight is based on the total weight of the paper. In one embodiment of the invention, the mineral load is selected from the group consisting of precipitated calcium carbonate (PCC), ground calcium carbonate (GCC), talc, and mixtures thereof.
  • In one embodiment of the invention, the paper further comprises other components, such as modified starch, an internal bonding agent (e.g., alkenyl succinic anhydride), and/or a surface bonding agent (e.g., alkyl ketene dimer).
  • In one embodiment of the invention, the paper has a grammage of about 30 g/m2 to about 110 g/m2, according to the ISO 536 standard, and/or a thickness of about 30 µm to about 120 µm, according to the ISO 534 standard.
  • The paper of the present invention, also called base paper, applicable for manufacturing flexible paper packaging, has good mechanical strength (tensile strength, tear strength, burst strength and elongation), low thickness, good printability, and recyclability. This paper has a PPS smoothness of around 2.5 µm, according to the ISO 8791 standard, when uncoated, and around 1.7 µm, according to the ISO 8791 standard, for coated paper, to obtain good printability and legibility in fine texts in rotogravure and flexographic printing processes. The paper of the present invention acts as a base for the application of a polymeric material, which can be applied to both the mesh and felt sides, with the aim of being used as a raw material for manufacturing primary or secondary packaging for the flexible packaging market.
  • The present invention further provides a coated paper comprising the paper described in the present invention and a barrier composition.
  • In an optional embodiment of the invention, the barrier composition comprises a sealing agent, a bio-binding agent, and an anti-blocking agent.
  • In one preferred embodiment of the invention, the sealing agent is polyvinyl alcohol (PVOH); the bio-binding agent is a starch or a formulation comprising starch; and the antiblocking agent is calcium stearate.
  • In an optional embodiment of the invention, the barrier composition comprises about 25% by weight to about 45% by weight of solids content, wherein the % by weight is based on the dry weight of the barrier composition. The solids content was measured using a drying oven or a moisture balance.
  • In one embodiment of the invention, the coated paper has a grammage of about 40 g/m2 to about 120 g/m2, according to the ISO 536 standard, and/or a thickness of about 40 µm to about 130 µm, according to the ISO 534 standard.
  • Both the paper and the coated paper of the present invention have good mechanical properties, such as good tensile strength, burst strength, tear strength and elongation strength, in addition to having good printability and recyclability. Furthermore, the coated paper of the present invention has good sealing properties and acts as a barrier against fat.
  • The Kit 12 method can be used to measure the fat barrier. In this method, the sample is subjected to a series of oil/fat mixtures, in which the mixtures are numbered from 1 to 12, in increasing order of potency. Higher kit numbers mean better barrier properties against oil and/or fat for the sample.
  • The present invention also relates to flexible paper packaging comprising the paper or coated paper of the present invention.
  • In one embodiment of the invention, the flexible paper packaging serves as food packaging or as a coating for pharmaceutical compositions.
  • The flexible paper packaging of the invention can be flowpack, flat bottom, stand-up pouch (SUP), wrap, 3-seal, 4-seal, SOS, and other types.
  • The flexible paper packaging of the present invention is biodegradable and compostable, and in particular, the packaging comprising coated paper has good sealing properties and barrier against fat.
  • The present invention also relates to the use of the paper or coated paper described herein for application in primary and secondary flexible packaging.
  • In a preferred embodiment of the invention, the use is for application in flexible food packaging or coating packaging for pharmaceutical compositions.
  • In one embodiment of the invention, the use is for application by means of vertical, horizontal, SOS filling machines, among others.
  • A method for obtaining the paper of the invention is also described herein, comprising the following steps:
    1. a) refining the fibers to a degree of about 300 CFS to about 400 CFS, preferentially about 320 CFS to about 380 CFS, more preferentially to 350 CFS;
    2. b) adding modified starch at a dosage of about 2 to 10 kg/ton, preferentially about 3 to 9 kg/ton, more preferentially about 4 to 8 kg/ton, wherein kg/ton refers to the mass of starch per mass of fiber;
    3. c) adding the internal bonding agent, such as alkenyl succinic anhydride, in an amount of about 0.5 to 4 kg/ton, preferentially about 1 to 2 kg/ton, emulsified with at least one natural polymer, wherein kg/ton refers to the mass of internal bonding agent per mass of fibers plus starch;
    4. d) adding the mineral load, which is selected from the group consisting of precipitated calcium carbonate (PCC), ground calcium carbonate (GCC), talc, and mixtures thereof, in an amount of about 2 to 15% by weight, preferentially about 2 to 7% by weight or 5 to 10% by weight, more preferentially 6 to 8% by weight of the total weight of the paper;
    5. e) optionally, adding a surface bonding agent, preferentially an alkyl ketene dimer;
    6. f) adding a natural polymer to the surface plus a second surface bonding agent, preferentially an alkyl ketene dimer.
  • In one embodiment of the invention, the following machines can be used to obtain the paper of the invention:
    • Headbox for manufacturing paper: paper framing from 1 to 3, preferentially 1.2 to 2.5, more preferentially 1.4 to 2.2. Headbox consistency of 0.3 to 0.9, preferentially 0.35 to 0.9, more preferentially 0.4 to 0.5; 0.5 to 0.6; 0.55 a 0.65; or 0.7 to 0.85.
    • Paper forming: manufacturing on Fourdrinier (flat table) and Duoformer equipment.
    • Press: The shoe press operates with a pressure of about 200 to 600 N/mm2, preferentially about 300 to 500 N/mm2, and more preferentially about 350 to 450 N/mm2.
    • Coating: Application of a natural polymer with a surface bonding agent, such as alkyl ketene dimer, in a fast bonding apparatus, or a third styrene-butadiene-based polymer in the range of about 5 to 12 g/m2, preferentially about 7 to 10 g/m2.
    • Calendering: Soft calender with a temperature of about 80 to 210 °C, preferentially about 90 to 210 ºC, more preferentially about 100 to 180 ºC.
  • Using the method mentioned above, it is possible to obtain paper with a grammage of about 30 g/m2 to about 110 g/m2.
  • In a preferred embodiment of the invention, Technique 1, described below, is used for manufacturing paper (base paper).
  • Technique 1: Production of base paper with a grammage between about 30 and 110 g/m2, according to the ISO 536 standard, using 100% short cellulose fiber, with a refining degree between 330 and 380 CFS, comprising a mineral load of 3 to 15% by weight, based on the total weight of the paper, and a shoe press pressure of 200 to 600 N/mm, using equipment with 2 stocks of 1 NIP each, which allows calendering of one side of the paper at a time. The equipment is used to adjust the smoothness on the couché on machine. The calenders found in other machines (hard calenders) do not have temperature adjustment and are used to standardize the thickness profile of uncoated paper. The temperature range in NIPs is 80 to 200 °C.
  • Reducing the mineral load and reducing cellulose refining by using 2 NIPs at the pressure and temperature described in Technique 1 resulted in a 15-30% reduction in thickness, a 5-20% increase in (MD and CD) tensile strength, a 5-20% increase in (CD and MD) elongation, a 5-10% increase in Mullen strength, and a 3-10% increase in tear strength (MD and CD), when comparing products of the same grammage in the standard operation. Such values were confirmed through analyses performed during quality control during the production of this material.
  • With pressure and the use of a soft calender, PPS smoothness values of 2.5 to 3 µm (according to the ISO 8791 standard) were obtained for uncoated papers and 1.5 to 2 µm (according to the ISO 8791 standard) for couché machine (one side only), showing excellent printability in the flexographic and rotogravure printing processes.
  • A method for manufacturing coated paper is also an object of the present invention. The method described comprises applying about 2 g/m2 to about 20 g/m2, according to the ISO 536 standard, of a barrier composition onto a paper of the present invention by means of reverse engraving, shank, blade, engraved roller, air knife, curtain coating, or printer systems. The barrier compound can be applied to either the felt or the mesh side of the base paper, and the application grammage will depend on the barrier requirements. The barrier composition has a solids content of about 25% by weight to about 45% by weight, wherein the % by weight is based on the dry weight of the barrier composition. The coated paper then manufactured can be used as packaging paper, having good sealing features and barrier against fat (kit 6 to 12).
  • In a preferred embodiment of the invention, Technique 2, described below, is used to manufacture a coated paper.
  • Technique 2: Application of coating to the felt or fabric side of the base paper, comprising a grammage of 2 to 20 g/m2, according to the ISO 536 standard, depending on the barrier requirement, transforming the base paper into packaging paper with sealing features and barrier against fat (kit 6 to 12). The application of polymeric material, with solids of 25 to 45% by weight (based on the dry weight of the barrier composition), can be done by means of reverse engraving, air knife, shank, blade, and curtain coating systems.
  • When the coating (barrier composition) was applied to the base paper, there was a 4 to 10% increase in the tensile strength of both tMD and CD, a 4 to 10% increase in the elongation of both MD and CD, and a 5 to 20% increase in the tear of both MD and CD.
  • Coated paper, wherein the coating has a grammage between 2 and 20 g/m2, has a solids content between 25 and 45% by weight (wherein % by weight is based on dry weight) and is applied in systems such as reverse engraving, air knife, shank, blade, and curtain coating. This paper has sealing properties and barrier against fat (kit 6 to 12), and is used as a substrate for packaging. Due to the properties obtained through Techniques 1 and 2, the coated paper has properties similar to plastic films made of polyethylene (PE) or polyethylene terephthalate (PET) with polyethylene (PE), in terms of tensile strength, thickness and excellent machinability in vertical and horizontal filling machines, with speeds between 30 ppm and 150 ppm, cruising speeds of the equipment, depending on the polymer structure.
  • The filling temperature of the paper that is the subject matter of this invention is about 110 ºC to 145 ºC, while the temperatures of polymeric films, such as PE or PET + PE, are around 160 ºC to 210 ºC, resulting in reduced energy costs due to the temperature and decreased accumulation of polymeric residue in the jaw (sealing). This is because the higher the temperature, the greater the tendency for the resin to degrade.
    • EXAMPLES
  • The examples presented in the present invention are non-exhaustive, intended only to illustrate the invention and should not be used as a basis for limiting it.
  • Examples 1 to 4 refer to tests aimed at paper production (base paper for packaging), with a reduction in mineral load, an increase in calender pressure (using 2 NIPs) and cellulose refining.
  • Example 5 refers to a comparative analysis between SAPPI paper (containing 40% long fiber) and the paper of the present invention (100% short fiber base paper).
  • Example 6 refers to a test evaluating sealing and machine performance.
  • Example 7 refers to a comparative analysis between a paper flowpack packaging according to the present invention and a plastic flowpack packaging (PET + PE).
  • Example 8 refers to a comparative analysis between a commonly marketed paper and the paper of the present invention.
  • Example 9 refers to comparisons between uncoated paper (base paper) and paper coated with a barrier composition (base paper + resin), all according to the present invention.
    • Example 1
  • This example describes a test, the main objective of which was to produce stock paper (1020 mml x 1000 mmD format), uncoated, with a grammage of 35 g/m2, according to the ISO 536 standard, manufactured with inputs that comply with the current regulations of ANVISA, BfR, and FDA. This composition is intended for use in flexible packaging, where the paper will be coated with a barrier composition and then undergo packaging testing.
  • About 52 tons (gross production)/47 tons (net production) of uncoated paper were produced at a final grammage of 35 g/m2.
  • Two calenders, NIP 1 and NIP 2, were used to achieve the target smoothness of this paper (NIP 1: 230 N/mm at a temperature of 130 ºC of NIP 2: 220 N/mm and a temperature of 150 ºC), thus reaching a PPS condition of, at most, 3.0 µm; in this case, a PPS of 2.64 µm (average) was obtained. Soft pressure was used.
  • For manufacturing flexible packaging, the thickness of the paper is very important for good machinability in filling converters (the thinner the paper, the better the machinability). During the test, an average thickness of 39.86 µm was achieved, which was considered satisfactory, as the goal was to reach a maximum thickness of 40.1 µm.
  • The paper production specifications were within expectations and are shown in Table 1. Table 1
    SPECIFICATION LIMITS
    PHYSICAL PROPERTIES REFERENCE UNITY MIN TARGET MAX AVERAGE*
    Grammage ISO 536 g/m2 33.6 35 36.4 36.46
    Thickness ISO 534 µm 36.3 38.2 40.1 39.86
    Humidity Tappi412 % 4 5 6 4.58
    ISO whiteness (C2º) ISO 2470 % 86 92 98 86.68
    Traction L DIN EN 1924-2 kN/m 3.41 3.92 - 3.87
    Traction T DIN EN 1924-2 kN/m 1.83 2.1 - 2.13
    Tear L ISO 1974 mN 129.49 161.87 - 209.59
    Tear T ISO 1974 mN 135.38 170.11 - 198.76
    Mullen DIN EN ISO kPa 153 155 - 170.8
    Burst 2758
    PPS - Side T ISO 8791 µm - 2.5 3 2.64
    *Average obtained from paper samples in accordance with the invention studied.
    • Example 2
  • This example describes a test, the main objective of which was to produce coated paper stock with a grammage of 56 g/m2 (format of 1020 mm x 1000 mm), using inputs that meet the current regulations of ANVISA, BfR, and FDA. This composition is intended for use in flexible packaging, where the base paper has been coated with a barrier composition and will proceed to filling tests.
  • About 44 tons (gross production)/40 tons (net production) of coated paper were produced with a final grammage of 56 g/m2, in accordance with the ISO 536 standard.
  • The application of the coating according to the conventional recipe for fit silk lacquer paper achieved a grammage between 6.3 and 9.6 g/m2, below the specified 8 to 12 g/m2. Two calenders, NIP 1 and NIP 2, were used to achieve the target smoothness of this paper (NIP 1: 235 N/mm at a temperature of 130 ºC of NIP 2: 280 N/mm and a temperature of 130 ºC), thus reaching a maximum PPS of 1.8 µm, in this case, a PPS of 1.85 µm (average) was obtained. Soft pressure was used.
  • The paper production specifications were within expectations and are shown in Table 2. Table 2
    SPECIFICATION LIMITS
    PHYSICAL PROPERTIES REFERENCE UNITY MIN TARGET MAX AVERAGE*
    Grammage ISO 536 g/m2 53.7 56 58.2 56.92
    Humidity Tappi412 % 3 4 5 4.39
    Traction L DIN EN 1924-2 kN/m 3.6 4.14 - 4.81
    Traction T DIN EN 1924-2 kN/m 1.93 2.21 - 2.53
    Tear L ISO 1974 mN 223.67 279.59 - 284.0
    Tear T ISO 1974 mN 230.54 288.41 - 311.08
    Mullen DIN EN ISO kPa 181 187 - 200.25
    Burst 2758
    PPS - Side T ISO 8791 µm 1.4 1.6 1.8 1.85
    Coating Weight g/m2 8 10 12 8.35
    *Average obtained from paper samples in accordance with the invention studied.
    • Example 3
  • This example describes a test, the main objective of which was to produce paper with a buffer solution for precipitated calcium carbonate (PCC), aiming to meet the parameters of ANVISA, FDA, and BfR.
  • About 50 tons of uncoated paper were produced, with a final grammage of 46 g/m2, and dimensions of 1020 mml x 1000 mmD.
  • For this test, surface starch is applied to both the mesh and felt sides, with a bonding agent and without bleach. Two calenders, NIP 1 and NIP 2, were used to achieve the target smoothness of said paper (NIP 1: 270 N/mm at a temperature of 170 ºC of NIP 2: 270 N/mm and a temperature of 170 ºC), thus reaching a maximum PPS of 2.8 µm, in this case, a PPS of 2.63 µm (average) was obtained.
  • For manufacturing flexible packaging, the thickness of the paper is very important for good machinability in filling converters (the thinner the paper, the better the machinability). During the test, an average thickness of 48.8 µm was achieved, which was considered satisfactory, as the goal was to reach a maximum thickness of 52.5 µm.
  • The paper production specifications were within expectations and are shown in Table 3. Table 3
    SPECIFICATION LIMITS
    PHYSICAL PROPERTIES REFERENCE UNITY MIN TARGET MAX AVERAGE*
    Grammage ISO 536 g/m2 44.16 46 47.84 46.2
    Thickness ISO 534 µm 47.5 50 52.5 48.8
    Humidity Tappi412 % 3 4 5 4.5
    ISO whiteness (C2º) ISO 2470 % 80 85 90 87.8
    Traction L DIN EN 1924-2 kN/m 3.6 4.14 - 4.18
    Traction T DIN EN 1924-2 kN/m 1.93 2.21 - 2.42
    Mullen Burst DIN EN ISO 2758 kPa 159 161 - 197
    PPS - Side T ISO 8791 µm - 2 2.5 2.63
    Load % 6 6.5 7 3.83
    Porosity ISO 5636-5 s/100 mL - - - 32.67
    *Average obtained from paper samples in accordance with the invention studied.
  • Gross production was 55 tons (23 coils of 2040 mm and 46 coils of 1020 mm), with dimensions of 1020 mml x 1000 mmD, as planned. Production was satisfactory, without interruption, at a speed of 830 m/min.
  • Figure 01 illustrates SEM analyses of the front and back surfaces of the paper. As can be seen, the paper produced in this test does not show significant surface irregularities and shows excellent closing. In this regard, it should be noted that it is desirable to obtain tighter (less porous) papers, because if the paper is porous, it requires more barrier material.
    • Example 4
  • This example describes a test, the main objective of which was to produce paper with a buffer solution for precipitated calcium carbonate (PCC), Carboflex ink, and aiming to meet the requirements of ANVISA, FDA, and BfR.
  • About 50 tons of coated paper were produced with a final grammage of 70 g/m2, with dimensions of 1020 mml (width) x 1000 mmD (diameter).
  • The application of the coating according to the conventional recipe for fit silk lacquer paper achieved a grammage of 10 g/m2, reaching the specified PEI weight of 10 to 12 g/m2. Two calenders, NIP 1 and NIP 2, were used to achieve the target smoothness of said paper (NIP 1: 270 N/mm at a temperature of 170 ºC of NIP 2: 270 N/mm and a temperature of 170 ºC), thus reaching a maximum PPS of 1.7 µm, in this case, a PPS of 1.7 µm (average) was obtained.
  • For manufacturing flexible packaging, the thickness of the paper is very important for good machinability in filling converters (the thinner the paper, the better the machinability). During the test, an average thickness of 62.8 µm was achieved, which was considered satisfactory, as the goal was to reach a maximum thickness of 64.05 µm.
  • The paper production specifications were within expectations and are shown in Table 4. Table 4
    SPECIFICATION LIMITS
    PHYSICAL PROPERTIES REFERENCE UNITY MIN TARGET MAX AVERAGE*
    Grammage ISO 536 g/m2 67.2 70 72.8 69.1
    Thickness ISO 534 µm 57.95 61 64.05 62.8
    Humidity Tappi412 % 3 4 5 4.4
    Brightness - Side T ISO 8254 % 31 34 37 31.3
    Opacity ISO 2471 % 80 83 86 80.1
    ISO whiteness (C2º) ISO 2470 % 88 90 92 89.4
    Traction L DIN EN 1924-2 kN/m 4.39 5.17 5.94 5.40
    Traction T DIN EN 1924-2 kN/m 2.61 3.08 3.54 2.62
    Mullen Burst DIN EN ISO 2758 kPa 227 232 - 238
    PPS - Side T ISO 8791 µm 1.5 - 1.7 1.70
    Load % 6 6.5 7 6.86
    Porosity ISO 5636-5 s/100 mL - - - 194.80
    Coating Weight g/m2 10 11 12 9.98
    *Average obtained from paper samples in accordance with the invention studied.
  • Figure 02 illustrates SEM analyses of the front and back surfaces of the paper. As can be seen, the paper produced in this test does not show significant surface irregularities and shows excellent closing.
    • Example 5
  • In this example, a comparative analysis is made between SAPPI Algro Finess 2000 paper (which contains 40% by weight of long fibers and 60% by weight of short fibers) and the paper of the present invention (100% short fiber base paper, referred to as GLBA070BR). The analysis performed indicates that the composition of the present invention has superior strengths.
  • Paper thickness is a critical factor in many machines currently used in industry, where thinner paper results in better machinability. In this sense, the paper proposed by the present invention has a thickness similar to the SAPPI paper tested.
  • Furthermore, the tensile strength CD and MD and the burst strength of the paper proposed by the present invention (GLBA070BR) are superior to the ones of SAPPI, as can be seen in Table 5. Table 5
    SPECIFICATION
    SAPPI PRESENT INVENTION
    PROPERTY UNITY STANDARD TARGET VALUE (SAPPI ALGRO FINESS 2000 - L1 Paper) TARGET VALUE (Base Paper GLBA070BR)
    Grammage g/m2 ISO 536 70.00 70.00
    Thickness µm ISO 534 65.00 61.00
    Density g/cm3 g/cm3 1.08 1.15
    Bulk cm3/g cm3/g 0.93 0.87
    MD Tensile strength N/15 mm DIN EN 1924-2 58.00 77.50
    CD Tensile strength N/15 mm DIN EN 1924-2 32.00 46.25
    Burst Kpa DIN EN ISO 2758 140.00 232.00
    Abs. moisture content % DIN EN ISO 287 4.00 5.00
  • As can be seen from the data in Table 5, the paper of the present invention, which comprises only short fibers, presents:
    • MD (machine direction) Tensile Strength 34% higher,
    • CD (cross direction) Tensile strength 45% higher,
    • Burst 66% higher compared to the SAPPI composition, which includes both long and short fibers.
  • The remaining properties are similar between SAPPI paper and the paper of the present invention.
    • Example 6
  • In this example, an evaluation is made of the sealing and machine performance of the paper of the present invention coated with a barrier composition, the latter comprising 35% by weight of polyvinyl alcohol (PVOH), 60% by weight of bio-binder and 5% by weight of calcium stearate.
  • The objective was to evaluate the behavior of paper coated with a barrier composition in a filling machine and under continuous productivity scenarios, in order to qualify the input.
  • Therefore, the raw material used in this test was Greenpack GLSA061BR (coated paper); the printing technology used was a flexographic printer, UV ink, UV varnish, and printing was performed by AlI4Labels; And the filling technology was Maquinox SPK 600 - Flowpack 4 seals 4 lanes. Table 6
    Parameter State Observations and Justifications
    Quality Paper with Barrier Approved The paper was flat, with no blocking or tack present. The paper presented good tensility as it passed through the printer without breaking.
    Print Quality Approved The paper presented excellent reproduction quality, with a good printing speed (60 m/min).
    Sealing Force Approved After adjustments to the jaws and temperature, all sides of the 4-seal sachets presented excellent sealing strength.
    Filling Approved It became evident that the paper adheres well to the filling process, after adjustments to the guide assembly with parallel axis and rolling bearing, ensuring greater alignment of the assembly during work. Machine speed: 60 tracks/minute (higher speed than the PET + PE film approved for this product, which is 40 tracks per minute).
    • Example 7
  • A comparative analysis between a paper flowpack, prepared with the paper of the present invention (sample GLSA061BR), and a plastic flowpack, made of polyethylene terephthalate (PET) and polyethylene (PE) is carried out in this example. The properties of each of the analyzed packages are shown in Table 7. Table 7
    Test (Vials) Flowpack paper Plastic flowpack
    Parameters Method Unity GLSA061BR PET + PE
    Grammage ISO 536 g/m2 61.8 67
    Thickness ISO 534 µm 62.3 64
    MD tensile strength DIN EN 1924-2 N/15 mm 68.6 35.34
    MD tensile index 1.11 0.53
    CD tensile strength DIN EN 1924-2 N/15 mm 39.27 37.65
    CD tensile index 0.64 0.56
    Sealing force kN/m 0.26 0.24
  • Based on the data in Table 7, it is noteworthy that the paper flowpack packaging of the present invention presents a 94% increase in MD tensile strength compared to the PET + PE flowpack, and a 4% increase in CD tensile strength.
  • It should also be noted that, although the paper flowpack packaging comprises a resin (barrier composition) that does not contain high-performance sealing polymers such as PE, its sealing strength (0.26 kN/m) is similar to the sealing strength of the flowpack packaging made of PET+PE plastic (0.24 kN/m).
    • Example 8
  • In this example, a comparative analysis is made between a commonly marketed paper ("commercial paper") and the paper of the present invention (namely "GNBA046BR"). The paper commonly sold comprises long fibers, short fibers, and mineral load.
  • The properties of the two products are shown in Table 8. To calculate the indexes, the desired property was divided by the grammage of the base paper. Table 8
    METHODOLOGY OF ANALYSIS Paper Commercial paper Index GNBA04 6BR Index Difference between products
    ISO 536 Total grammage (g/m2) 45 46
    Base paper grammage (g/m2) 45 46
    ISO 534 Thickness (µm) 56.6 1.26 47 1.02 -23%
    DIN EN 1924-2 CD Tensile Strength (kN/m) 2.03 0.05 2.5 0.05 17%
    MD Tensile Strength (kN/m) 3.81 0.08 4.17 0.09 7%
    DIN EN 1924-2 CD elongation (mm) 2.07 0.05 2.42 0.05 13%
    MD elongation (mm) 6 0.13 6.53 0.14 6%
    DIN EN ISO 2758 Burst (kPa) 176 3.91 196 4.26 8%
    ISO 1974 CD tear (mN) 255.06 5.67 271 5.89 4%
    MD tear (mN) 245.25 5.45 261 5.67 4%
    ISO 8791 Smoothness (µm) 5 o 2.5 o -100%
  • Based on the data in Table 8, it is possible to note that there was a significant reduction in the thickness of the paper in the present invention compared to the one commonly used in the industry (a reduction of 23%) and in the smoothness thereof. Reducing smoothness improves printability and surface application. Furthermore, the paper of the present invention presents higher CD and MD tensile strength, CD and MD elongation strength, burst strength, and tear strength.
    • Example 9
  • In this example, comparisons are made between uncoated paper (base paper) and paper coated with a barrier composition (base paper + resin), all in accordance with the present invention.
  • The properties of the products are shown in Table 9. To calculate the indexes, the desired property was divided by the grammage of the base paper. Table 9
    METHODOLOGY ANALYSIS ISO 536 ISO 534 DIN EN 1924-2 DIN EN 1924-2 DIN EN ISO 2758 ISO 1974 ISO 8791
    Paper Product type Total Grammage Paper Grammage Thickness CD tensile strength MD tensile strength MD elongation CD elongation Burst CD tear MD tear Smoothness
    GNB A035 BR BASE 35 35 38.23 2.11 3.45 2 6 162 165 261 2.5
    Index 1.09 0.06 0.10 0.06 0.17 4.63 4.71 7.46
    GNSA 040B R RESIN 40 35 42.5 2.2 3.75 2.12 6.43 162 190 284 2.5
    Index 1.21 0.06 0.11 0.06 0.18 4.63 5.43 8.11
    Difference between products 4% 8% 6% 7% 0% 13% 8% 0%
    GNB A046 BR BASE 46 46 47 2.5 4.17 2.42 6.53 196 271 261 2.5
    Index 1.02 0.05 0.09 0.05 0.14 4.26 5.89 5.67
    GNSA 051B R RESIN 51 46 53 2.62 4.56 2.51 7.1 196 329 284 2.5
    Index 1.15 0.06 0.10 0.05 0.15 4.26 7.15 6.17
    Difference between products 5% 9% 4% 8% 0% 18% 8% 0%
    GLBA 056B R BASE 56 46 48.7 2.58 4.31 2.31 6.6 191 297 280 1.73
    Index 0.06 0.09 0.05 0.14 4.15 6.46 6.09
    GLSA 061B R RESIN 61 46 52.5 2.84 4.65 2.55 6.94 198 302 290 1.73
    Index 0.06 0.10 0.06 0.15 4.30 6.57 6.30
    Difference between products 9% 7% 9% 5% 4% 2% 3% 0%
    GLBA 070B R BASE 70 60 61 2.86 5.2 2.68 7 235 437 406 1.73
    Index 0.05 0.09 0.04 0.12 3.92 7.28 6.77
    GLSA 075 B R RESIN 75 60 64 3.1 5.55 2.87 7.6 250 444 423 1.73
    Index 0.05 0.09 0.05 0.13 4.17 7.40 7.05
    Difference between products 8% 6% 7% 8% 6% 2% 4% 0%
  • Note that there is an increase in strength when the barrier composition is applied, although the uncoated paper already exhibits good strength.

Claims (16)

  1. Paper, characterized in that it comprises from about 60% by weight to about 95% by weight of short fibers and from about 2% by weight to about 15% by weight of mineral load.
  2. Paper, according to claim 1, characterized in that the mineral load is selected from the group consisting of precipitated calcium carbonate (PCC), ground calcium carbonate (GCC), talc, and mixtures thereof.
  3. Paper, according to claim 1 or 2, characterized in that it further comprises other components, such as modified starch, internal bonding agent and/or surface bonding agent.
  4. Paper, according to any one of claims 1 to 3, characterized in that it has a grammage of about 30 g/m2 to about 110 g/m2; and/or thickness of about 30 µm to about 120 µm.
  5. Coated paper, characterized in that it comprises the paper defined in any one of claims 1 to 4 and a barrier composition.
  6. Coated paper, according to claim 5, characterized in that the barrier composition comprises a sealing agent, a bio-binding agent, and an anti-blocking agent, wherein the sealing agent is preferentially polyvinyl alcohol (PVOH); the bio-binding agent is preferentially starch or a formulation comprising starch; and the antiblocking agent is preferentially calcium stearate; and
    the barrier composition optionally comprises from about 25% by weight to about 45% by weight of solids content, wherein the % by weight is based on the dry weight of the barrier composition.
  7. Coated paper, according to claim 5 or 6, characterized in that it has a grammage of about 40 g/m2 to about 120 g/m2; and/or thickness of about 40 µm to about 130 µm.
  8. Paper packaging, characterized in that it comprises the paper defined in any one of claims 1 to 4, or the coated paper defined in any one of claims 5 to 7.
  9. Paper packaging, according to claim 8, characterized in that it is a food packaging or a coating packaging for pharmaceutical compositions.
  10. Paper packaging, according to claim 8 or 9, characterized in that it is flowpack, flat bottom, stand-up pouch (SUP), wrap, 3-seal, 4-seal, SOS, or other types.
  11. Use of the paper defined in any one of claims 1 to 4, or of the coated paper defined in any one of claims 5 to 7, characterized in that it is for application in primary and secondary flexible packaging.
  12. Use, according to claim 11, characterized in that it is for application in food packaging, such as flour, rice, and bean packaging, or coating packaging for pharmaceutical compositions.
  13. Use, according to claim 11 or 12, characterized in that the application is by means of vertical, horizontal, SOS filling machines, among others.
  14. Method for obtaining the paper defined in any one of claims 1 to 4, characterized in that it comprises:
    (a) refining the fibers;
    (b) adding modified starch;
    (c) adding an internal bonding agent;
    (d) adding the mineral load;
    (e) optionally, adding a surface bonding agent; and
    (f) adding a natural polymer to the surface plus a second surface bonding agent.
  15. Method for manufacturing a coated paper, characterized in that it includes applying about 2 g/m2 to about 20 g/m2 of a barrier composition onto a paper defined in any of claims 1 to 4 by means of reverse engraving, shank, blade, engraved roller, air knife, curtain coating, or printer systems.
  16. Invention of product, process, system, kit, or use, characterized in that it comprises one or more elements described herein.
EP24809873.3A 2023-05-19 2024-05-20 Paper, coated paper, use thereof, paper packaging and methods Pending EP4700176A1 (en)

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PCT/BR2024/050204 WO2024239082A1 (en) 2023-05-19 2024-05-20 Paper, coated paper, use thereof, paper packaging and methods

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