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
  • D21H17/20—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
  • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
  • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
  • D21H11/04—Kraft or sulfate pulp
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/62—Rosin; Derivatives thereof
• • 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

Definitions

• the present disclosure relates to the field of machine glazed paper and a method for preparing the machine glazed paper. More specifically the present disclosure relates to a machine glazed paper for preparing paper sticks.
• Paperbased materials have however traditionally been considered less suitable for use in making such single-use plastic material, such as for example cotton buds and lollipop sticks, as paperbased items have been considered having low shape stability compared to such plastic items. It has also been difficult to attain a proper sealability without including components negatively affecting the degradability of the items. During manufacturing of such paper component, dusting and blunting have also been causing important issues in the converting machines.
• a machine glazed paper comprising softwood fibers and starch, the machine glazed paper comprising the starch in an amount within the range of from 0.1 wt.% by weight to 2 wt.% of the dry weight of the machine glazed paper and the amount of softwood fibers of the total amount of fibers is 63 wt.% or more.
• the machine glazed paper has a Cobb value within the range of from 20 gsm to 50 gsm, as measured according to the standard method ISO 535:2014.
• the machine glazed paper comprises softwood cellulose fibers, also called long fibers.
• softwood cellulose fibres measure from about 2 to 4 millimetres in length, compared to hardwood fibres ranging from about 0.5 to 1.5 millimetres.
• softwood include pine, fir, spruce, larch and cedar.
• paper after refining the softwood fibers are below 2mm.
• the paper comprises long fibers enables production of paper sticks having an improved bending resistance and reduced dusting during slitting operations.
• the high starch content in combination with the high and fast water absorption of the paper has been found by the present inventors to enable an improved tensile strength and sealability of the paper during formation of paper sticks.
• Both of the sides of the machine glazed paper i.e. the glazed and the non-glazed side of the machine glazed paper, have a Cobb value within the range of from 20 gsm to 50 gsm, as measured according to the standard method ISO 535:2014.
• the machine glazed paper may have a Cobb value within the range of from 24 gsm to 50 gsm, as measured according to the standard method ISO 535:2014. Optionally, within the range of from 25 gsm to 45 gsm.
• the machine glazed paper may comprise the starch in an amount within the range of from 0.2 wt.% by weight to 2 wt.% of the dry weight of the machine glazed paper, preferably 0.4 wt.% to 2 wt.% of the dry weight of the machine glazed paper.
• the Cobb value of the paper may be obtained by lowering the amount of sizing agents in the paper, such as to a level of below 0.5 wt.%.
• the paper is free Alkylketen Dimer (AKD) and Alkenyl Succinic Anhydride (ASA).
• the machine glazed paper may comprise rosin in an amount of below 1 wt.%, preferably within the range of from 0.05 wt.% to 0.5 wt.%, based on the dry weight of the machine glazed paper, more preferably within the range of from 0.09 to 0.3 wt.%, based on the dry weight of the machine glazed paper.
• the machine glazed paper may comprise Alum (aluminum sulfate) in an amount within the range of from 0.1 wt.% to 1 wt.%, preferably within the range of from 0.1 wt.% to 0.5 wt.%, based on the dry weight of the machine glazed paper.
• Alum aluminum sulfate
• the machine glazed paper may comprise 4 wt.% or less of fillers, such as 3 wt.% or less of fillers, such as 2 wt.% or less of fillers, preferably 1 wt.% or less of fillers, more preferably 0.5 wt.% or less of fillers, based on the total weight of the paper, preferably the machine glazed paper is free from fillers.
• 65 wt.% or more of the fibers in the machine glazed paper are softwood fibers, preferably 75 wt.% or more of the fibers in the machine glazed paper are softwood fibers, more preferably, from 85 wt.% to 100 wt.% of the fibers in the machine glazed paper are softwood fibers.
• the fibers in the machine glazed paper are softwood fibers, preferably 100 wt.% of the fibers in the machine glazed paper are softwood fibers.
• the machine glazed paper may have a basis weight within the range of from 35 gsm to 100 gsm, preferably within the range of from 38 gsm to 85 gsm. It has been found that the machine glazed paper according to the present disclosure is within these ranges are particularly suitable for forming paper sticks. When using the machine glazed paper of higher basis weight, the stiffness was increased and when using lower ranges, the process of making the paper sticks was negatively affected since an increased number or rolling is needed which increases the complexity and the defect rate of the paper sticks during process.
• the softwood fibers may be unbleached softwood fibers. It was surprisingly found that the sealability of the paper, during manufacturing of paper sticks, was improved by using unbleached softwood fibers.
• the softwood fibers may alternatively be bleached softwood fibers or a mix between bleached and unbleached softwood fibers.
• the machine glazed paper may have an CD/MD ration of from 0.5. This provides an indication that the fibers of the machine glazed paper mainly are oriented in the MD direction. During slitting of the paper, when manufacturing paper sticks, such fiber orientation was found advantageous in that dusting was reduced.
• the machine glazed paper may have a MD stretch of from 0.5% to 2%, preferably a MD stretch of from 1% to 1.9%, as measured according to the standard method ISO 1924/3.
• the fact that the machine glazed paper exhibited a MD stretch of from of from 0.5% to 2% enabled production of stiffer paper sticks by the paper according to the present disclosure.
• the machine glazed paper may have a CD stretch of from 1.5% to 6.5%, preferably a CD stretch of from 2% to 5.5%, such as a CD stretch within the range of from 2 to 4.5%, as measured according to the standard method ISO 1924/3.
• the fact that the machine glazed paper exhibited a CD stretch of from 1.5% to 6.5% enabled production of stiffer paper sticks which also resist bending without breakage.
• the fact that the first side of the paper is machine glazed provides the paper with enhanced sealing when being an inner side during paper stick production.
• the non-glazed side of the machine glazed paper may have a roughness of 500 ml/min to 2000 ml/min, preferably within the range of from 350 ml/min to 1500 ml/min.
• the fact that the second side, being the outer side during paper stick production, is a non-glazed side having a roughness of from 350 ml/min to 2000 ml/min, such as 500 ml/min to 2000 ml/min, preferably within the range of from 350 ml/min to 1500 ml/min, provides an improved adherence to, by frictional force, for example the cotton part in a cotton bud. It has also seen providing an improved user handfeel.
• the paper may be a non-calendered paper, this provides an increased roughness for the non-glazed side of the paper.
• the machine glazed paper may have an air resistance within the range of from 15 to 35 s, as measured according to the standard method ISO 5636 "Paper and board - Determination of air permeance (medium range) - Part 5: Gurley method. It was surprisingly found by the present inventor that the sealing speed of the machine glazed paper is improved when the air resistance of the paper is within the range of from 15 to 35 s.
• the machine glazed paper may be for use to prepare paper sticks, such for ear buds or lollipop sticks.
• the present disclosure relates to a use of the machine glazed paper according to the first aspect for producing a paper stick.
• the present disclosure relates to a paper stick, such as an ear bud stick or a lollipop stick comprising or consisting of the machine glazed paper according to the first aspect.
• the present disclosure relates to a method for producing the machine glazed paper according to the first aspect, the method comprising the steps of;
• 65 wt.% or more of the fibers in the machine glazed paper may be softwood fibers, preferably 75 wt.% or more of the fibers in the machine glazed paper are softwood fibers, more preferably, from 85 wt.% to 100 wt.% of the fibers in the machine glazed paper are softwood fibers.
• the fibers in the machine glazed paper are softwood fibers, preferably 100 wt.% of the fibers in the machine glazed paper are softwood fibers.
• the machine glazed paper may have a Cobb value within the range of from 24 gsm to 50 gsm, as measured according to the standard method ISO 535:2014. Optionally, within the range of from 25 gsm to 45 gsm.
• the suspension may comprise the starch in an amount within the range of from 0.2 wt.% by weight to 2 wt.% based on total dry weight, preferably 0.4 wt.% to 2 wt.% based on total dry weight.
• the softwood fibers of the suspension may be unbleached or bleached softwood fibers.
• the softwood fibers may alternatively be bleached softwood fibers or a mix between bleached and unbleached softwood fibers.
• the machine glazed paper may have an CD/MD ration of from 0.5. This is an indication of that the fibers of the machine glazed paper may mainly be oriented in the MD direction, such as that 75 wt.% of the fibers of the machine glazed paper are oriented in the MD direction.
• the second side of the machine glazed paper may have a roughness of from 350 ml/min to 2000 ml/min, optionally within the range of from 500 ml/min to 2000 ml/min, preferably within the range of from 350 ml/min to 1500 ml/min. This provides an improved adherence to, by frictional force, for example the cotton part in a cotton bud. It has also seen providing an improved user handfeel.
• the present disclosure thus relates to a machine glazed paper comprising softwood fibers and starch.
• a major part of the fibers of the machine glazed paper are softwood fibers, i.e. 63 wt.% or more, or 65 wt.% or more, or from 85 wt.% to 100 wt.%, more preferably from 95 wt.% to 100 wt.% by weight of the of the fibers in the machine glazed paper are softwood fibers, such as 100 wt.% of the fibers.
• the machine glazed paper comprises starch in an amount within the range of from 0.1 wt.% by weight to 2 wt.% of the dry weight of the machine glazed paper.
• the machine glazed paper furthermore has a Cobb value within the range of from 20 gsm to 50 gsm.
• the Cobb value is measured according to the standard method ISO 535:2014.
• the Cobb value provides information about the water absorption capacity of the paper sample and determines the amount of water that is absorbed by a defined area of the paper through one-sided contact with water, within a certain amount of time.
• the machine glazed paper may have a Cobb value within the range of from 24 gsm to 50 gsm, as measured according to the standard method ISO 535:2014. Optionally, within the range of from 25 gsm to 45 gsm
• each of the sides shall be tested and fulfil the Cobb value, i.e. be in contact with water during measurements, the exposure time of testing is 60 seconds, and the test area is 100 cm 2 .
• the machine glazed paper was conditioned at a temperature of 23°C and at 50% RT.
• the machine glazed paper may comprise the starch in an amount within the range of from 0.2 wt.% by weight to 2 wt.% of the dry weight of the machine glazed paper, preferably 0.4 wt.% to 2 wt.% of the dry weight of the machine glazed paper.
• the machine glazed paper may comprise rosin in an amount of below 1 wt.%, preferably within the range of from 0.05 wt.% to 0.5 wt.%, based on the dry weight of the machine glazed paper, more preferably within the range of from 0.09 to 0.3 wt.%, based on the dry weight of the machine glazed paper.
• the machine glazed paper may comprise Alum (aluminum sulfate) in an amount within the range of from 0.1 wt.% to 1 wt.%, preferably within the range of from 0.1 wt.% to 0.5 wt.%, based on the dry weight of the machine glazed paper.
• Alum aluminum sulfate
• the machine glazed paper may comprise 4 wt.% or less of fillers, such as 3 wt.% or less of fillers, such as 2 wt.% or less of fillers, preferably 1 wt.% or less of fillers, more preferably 0.5 wt.% or less of fillers, based on the total weight of the paper, preferably the machine glazed paper is free from fillers.
• the amount of filler may be measured by means of ash content by the standard method ISO 1762:2001.
• the type of fillers may be determined by Fourier-transform infrared spectroscopy (FTIR).
• Bending resistance of the paper is measured herein according to the standard method ISO 2493-1.
• the Cobb value of the paper as disclosed herein may be obtained by using a low amount of sizing agents in the paper in combination with adding of the starch in amounts as disclosed herein.
• the machine glazed paper may comprise sizing agents in the paper in an amount of below 1 wt.%, such as to a level of below 0.5 wt.%.
• the paper may be free from Alkylketen Dimer (AKD) and Alkenyl Succinic Anhydride (ASA).
• the machine glazed paper comprises rosin in an amount of below 0.5 wt.%, preferably within the range of from 0.05 wt.% to 0.5 wt.%, more preferably within the range of from 0.09 wt.% to 0.3 wt.%, based on the dry weight of the machine glazed paper.
• the present disclosure also relates to a method for producing the machine glazed paper as disclosed herein, the method comprising the steps of;
• the present disclosure furthermore relates to a use of the machine glazed paper as disclosed herein for producing a paper stick.
• the paper sticks may be used for example as ear buds or lollipop sticks.
• a method of forming a paper stick from the machine glazed paper as disclosed herein comprises the following steps;
• the cut paper stripe may have a length, as measured in the machine direction of the machine glazed paper, of about 60 to 80 mm, optionally from 65 to 75 mm, and a width, as measured in the cross direction of the machine glazed paper of about 250 to 350 mm, optionally from 280 to 320 mm.
• the final pressed, sealed and cut paper sticks may have a diameter of about 2.2 to 2.7 mm, such as from 2.4 to 2.5 mm, and a length of about 70 to 80 mm, such as about 74 to 76 mm.
• the target Cobb values were achieved by reducing the amount of alum and rosin. No further sizing agents were included in the paper.
• paper sticks were produced using three different types of paper.
• One paper, Ex. 4 according to the present invention a comparative example CEx1, being a non-glazed paper comprising 100% softwood fibers and a comparative example CEx2, being a machine-glazed paper comprising 60% softwood fibers and 40% hardwood fibers.
• Table 3 Ex4 Cex1 Cex2 Softwood fibers [%] 100 100 60 Hardwood fibers [%] 40 Filler [%] 0 0 5.5 ⁇ Machine-glazed yes no yes Cobb values [gsm] 30/30 30/30 27/27 Starch [kg/ton] 5 5 3 *kaolin
• Paper sticks were produced according to the method disclosed above. Paper sticks were cut to a length of 71.5 mm, with a cutting length of 70 mm.
• the bending resistance of the paper sticks were measured with the L&W Bending tester from ABB measuring the force needed to bend a test piece at a predetermined angle.
• the bending resistance significantly improved for when preparing the paper sticks using a machine glazed paper according to the present disclosure compared to when using a paper comprising a higher amount of hardwood fibers or a non-machine-glazed paper.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
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Citations (7)

• 2022
  • 2022-06-30 EP EP22182376.8A patent/EP4299831A1/fr active Pending
• 2023
  • 2023-06-29 WO PCT/EP2023/067929 patent/WO2024003314A1/fr unknown

Patent Citations (7)

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