WO2022006608A1 - Procédé pour produire des pailles à base de fibres cellulosiques - Google Patents

Procédé pour produire des pailles à base de fibres cellulosiques Download PDF

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Publication number
WO2022006608A1
WO2022006608A1 PCT/AT2021/060240 AT2021060240W WO2022006608A1 WO 2022006608 A1 WO2022006608 A1 WO 2022006608A1 AT 2021060240 W AT2021060240 W AT 2021060240W WO 2022006608 A1 WO2022006608 A1 WO 2022006608A1
Authority
WO
WIPO (PCT)
Prior art keywords
paper
drinking straw
web
cellulose
cellulose fiber
Prior art date
Application number
PCT/AT2021/060240
Other languages
German (de)
English (en)
Inventor
Lars Goran Berglund
Petr Jindra
Elisabeth SCHWAIGER
Original Assignee
Mondi Ag
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 Mondi Ag filed Critical Mondi Ag
Priority to US18/004,887 priority Critical patent/US20240018724A1/en
Priority to CN202180045748.1A priority patent/CN115867706A/zh
Priority to EP21754888.2A priority patent/EP4179144A1/fr
Publication of WO2022006608A1 publication Critical patent/WO2022006608A1/fr

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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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/20—Chemically or biochemically modified fibres
    • 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
    • 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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G21/00—Table-ware
    • A47G21/18—Drinking straws or the like
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/022—Heating the cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • 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
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/14—Carboxylic acids; Derivatives thereof
    • D21H17/15—Polycarboxylic acids, e.g. maleic acid
    • 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
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/17—Ketenes, e.g. ketene dimers
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/32—Multi-ply with materials applied between the sheets

Definitions

  • the invention relates to a method for producing cellulose fiber-based drinking straws and a cellulose fiber-based drinking straw.
  • WO 2019175470 A1 presents a drinking straw in which the drinking straw material is basically recyclable and biodegradable but coated cardboard.
  • the drinking straw consists of a substantially rectangular sheet-like piece of coated cardboard.
  • WO 2019175470 A1 discloses very little about the properties of the paper or cardboard used.
  • wet strength agents are water-miscible polymer solutions in the processing state, which primarily consist of polyamines and epichlorohydrin derivatives. be produced. Products based on urea-formaldehyde or melamine-formaldehyde are also conceivable as wet strength agents, but these are no longer preferred for reasons of avoiding health risks.
  • Bleached and/or unbleached cellulose fibers and mixtures thereof are conceivable as starting material for cellulose fiber-based drinking straws.
  • the object of the present invention was to provide a process for the production of cellulose fiber-based drinking straws which is as efficient as possible from a technical, economic and ecological point of view.
  • the object of the invention was to provide a cellulose fiber-based drinking straw that satisfies the requirements of consumers - such as taste neutrality - and the packaging and food industry as well as aspects of sustainability such as recyclability, compostability and bio logical degradability.
  • the method according to the invention for the production of cellulose fiber-based drinking straws comprises the steps:
  • At least one paper web or several of the paper webs to egg nem cellulose fiber-based drinking straw. It is provided that at least the first side of the at least one fleece web is compressed before, during or after one of the drying steps and before further processing to form a cellulose fiber-based drinking straw with a line load of 80 kN/m to 500 kN/m.
  • the at least one-sided compression of the nonwoven web causes a cellulose fiber-based drinking straw made from a nonwoven web according to the invention or a paper web produced according to the invention to be water-resistant or water-resistant at least for the duration of its use. It has been found that the densification of the surface of the non-woven web causes the cellulose fibers in the vicinity of the surface to be smoothed.
  • the compaction achieved in this way is equivalent to a kind of sealing, which works without any paints, coatings or similar auxiliary materials. This type of sealing reduces or even prevents liquids from penetrating undesirably or too quickly into the wall structure of the drinking straw.
  • Premature softening can thus be effectively prevented or at least delayed for a sufficiently long period of time so that the function and dimensional stability of the drinking straw can be guaranteed during its period of use.
  • a one-sided compaction and a smoothing of the fleece web or the paper web that may go hand in hand with it is basically sufficient. Whether compression on both sides is advisable depends, among other things, on the specific application.
  • a cellulose fiber-based drinking straw produced according to the invention is also easily accessible for recycling or repulping, i.e. returning to an aqueous cellulose suspension.
  • any additives that are added to the aqueous suspension care must be taken to ensure that only such additives are included that are harmless to a user and the environment with regard to an aqueous extraction application, such as the use of drinking straws are. This can apply to both cold and hot extraction applications.
  • a cellulose fiber-based drinking straw produced according to the invention can be recycled without any additional effort or without additional complex process steps. Efficient “repulping” can be facilitated in particular if the process according to the invention does not require the addition of additives in the form of wet strength agents.
  • At least the first side of the at least one fleece web is thermally treated in the course of compression. This can preferably be done in one or more steps at a temperature of 90°C to 97°C and/or at a temperature of 200°C to 295°C.
  • a thermal treatment that takes place in addition to the pressurization can have an advantageous effect on the water resistance of the cellulose fiber-based drinking straw produced according to the invention. This can be achieved in that the influence of heat can bring about an additional smoothing or further compression of the surface of the fleece or paper web.
  • a wide nip calender which is also referred to as a shoe calender, can usually take place at the end of a drying section.
  • At least one nonwoven web is pressed with its first side against the surface of a heated drying cylinder by means of one or more pressure rollers, with the at least one nonwoven web being guided over a large part of the circumference of the drying cylinder and additionally by means of a drying cylinder at least least partially surrounding drying hood is heated from the outside.
  • So-called “MG papers” (“machine-glazed” papers) or calendered papers can also be produced with low grammages and are generally easy to print on.
  • the pulp material used is a pulp mixture consisting of long-fiber sulfate pulp and short-fiber sulfate pulp, preferably short-fiber sulfate pulp, with a length-weighted average fiber length according to ISO 16065-2:2014 from 1.05mm to 2.50mm.
  • Sulfate pulp is also known to those skilled in the art under the term kraft pulp. It can be advantageous if the cellulose mixture is provided from 20% by weight to 80% by weight long-fiber sulphate cellulose and from 20% by weight to 80% by weight short-fibre cellulose, preferably short-fibre sulphate cellulose will. A mixture within the specified limits has proven to be particularly advantageous in practice for achieving good compressibility.
  • the at least one suspension may contain at least one sizing agent as an additive based on the active substance of the sizing agent in an amount of 0.07% by weight to 1.0% by weight based on 100% by weight of the total dry matter of the at least is added to a suspension.
  • the addition of sizing agents to at least one aqueous suspension is also referred to as internal sizing.
  • At least one sizing agent selected from a group consisting of alkenylsuccinic anhydride (ASA), alkyl ketene dimer (AKD), resin sizes or natural sizing agents, or a mixture of sizing agents selected from this group is added to the at least one suspension.
  • ASA alkenylsuccinic anhydride
  • ALD alkyl ketene dimer
  • resin sizes or natural sizing agents or a mixture of sizing agents selected from this group is added to the at least one suspension.
  • the sizing agents mentioned can have a particularly advantageous effect on various properties of the paper web or of the cellulose fiber-based drinking straw.
  • the addition of these sizing agents can have a positive effect on the contact angle of the paper web.
  • the at least one suspension is produced with a consistency of 0.15% to 0.70%.
  • the aqueous suspension is used as a low-consistency suspension with a consistency of 0.15% to 0.30% or as a high-consistency suspension with a consistency of up to 0 .70% is manufactured.
  • the consistency selected in each case can depend on the machine type, the laser material mixture, the drying performance of the machine and other other parameters.
  • the specific structure of such a layer can be adapted to the special requirements of the specific application. According to a particular embodiment, it is possible for the compressed first side of a paper web to be in contact with the uncompacted second side of the additional paper web layered on top.
  • the paper webs are glued to one another, with an adhesive being applied over the entire surface or in sections to the contacting sides of the paper webs.
  • an adhesive being applied over the entire surface or in sections to the contacting sides of the paper webs.
  • applying it in sections can be sufficient to ensure permanent cohesion during use of the cellulose-fiber-based drinking straw.
  • the adhesive is applied over the entire surface or at least over a large part of the contact surface.
  • the at least one paper web or several layered and connected paper webs are made up into paper strips in the course of further processing into a cellulose fiber-based drinking straw, with a paper strip being delimited by two leading edges and two transverse edges and with in the area of the two Each catch edge has an overlapping area, and that bending a paper strip around a drinking straw axis forms a preferably cylindrical hollow body that is open on both sides, with the paper strip being shaped in such a way that an overlapping section is formed by overlapping the two overlapping areas, and that the two overlapping areas are glued together in the overlapping section.
  • the paper strip is shaped in such a way that its two catch edges run essentially parallel to the axis of the drinking straw.
  • the paper strip is formed in such a way that the two catch edges essentially run spirally or helically around the axis of the drinking straw.
  • a cellulose fiber-based drinking straw is also provided, which is produced in particular by a method according to one of claims 1 to 16 and comprises a preferably cylindrical hollow body open on both sides with an outer surface and an inner surface. It is provided that the hollow body is formed by at least one shaped paper strip, the at least one paper strip being made up of at least one paper web with at least one compressed first side.
  • a paper web compressed at least on one side has the effect that a cellulose fiber-based drinking straw produced from it is water-resistant or water-resistant at least for the duration of its use. It has been found that the compression of the surface of at least one paper web causes the cellulose fibers in the vicinity of the surface to be smoothed.
  • the compaction achieved in this way is equivalent to a kind of sealing, which, however, works without any paint, coating or similar additives.
  • This type of seal reduces or even prevents liquids from penetrating undesirably or too quickly into the wall structure of the drinking straw. Premature softening can thus be effectively prevented or at least delayed long enough so that the functionality and dimensional stability of the drinking straw can be guaranteed during its service life.
  • a cellulose fiber-based drinking straw according to the invention is also easily accessible for recycling or repulping, i.e. returning to an aqueous cellulose suspension .
  • any additives that are added to the aqueous suspension care must be taken to ensure that only such additives are included that are harmless to a user and the environment with regard to an aqueous extraction application, such as the use of drinking straws are. This can apply to both cold and hot extraction applications.
  • a cellulose fiber-based drinking straw according to the invention can be recycled without any additional effort or without additional complex process steps. Efficient “repulping” can be facilitated in particular if the process according to the invention does not require the addition of additives in the form of wet strength agents.
  • the compacted first side of the at least one paper web has a Cobb 1800s value according to ISO 535:2014 of 24 g/m 2 to 62 g/m 2 .
  • the Cobb 1800s value according to ISO 535:2014 represents an absolute value of the water absorption capacity of a paper
  • the grammage of the paper can play a significant role or have a significant influence on this absolute value, a better comparability between different papers
  • a percentage of water content over the entire grammage range can also be meaningful for characterizing the paper properties.
  • Such a percentage water content can be calculated from the relationship between a measured Cobb 1800s value according to ISO 535:2014 and the grammage of the paper.
  • a percentage water content of 35% to 48% can be advantageous for a paper web - this under the assumption that 7% water in the paper as equilibrium moisture content when stored in a climate at 23°C ⁇ 1°C and 50% ⁇ 2% relative humidity according to ISO 187:1990 are present.
  • Three sample calculations for different paper webs are given below as an example:
  • a difference in a Cobb 1800s value according to ISO 535:2014 between the compressed first side and the second side, which is not or less strongly compressed is a maximum of 3 g/m 2 .
  • less compacted is meant that the second side is less compacted compared to the first side because it is not pressed against a smooth surface, for example.
  • papers according to the invention with grammages preferably from 22 g/m 2 to 200 g/m 2 according to ISO 536:2012 can be used for the production of cellulose fiber-based drinking straws. In principle, however, the use of papers with lower, but also with higher grammages is of course also conceivable and possibly expedient.
  • the compressed first side of the at least one paper web it is possible for the compressed first side of the at least one paper web to have a Bendtsen roughness according to ISO 8791-2:2013 of 30 ml/min to 250 ml/min.
  • the at least one paper web has a gloss value of 20% to 35% according to TAPPI T 480:2015. It can be advantageous, particularly in a manufacturing process with shoe calenders, if a gloss value according to TAPPI T 480:2015 is from 21% to 25%. When manufacturing MG papers, it can be useful if the gloss value is from 24% to 33% according to TAPPI T 480:2015.
  • the compacted first side of the at least one paper web has a static contact angle according to ISO 19403-2:2020 with water as the test liquid used of 100° to 120°.
  • the difference in a static contact angle according to ISO 19403-2:2020 using water as the test liquid between the compacted first side and the second side that is not or less compacted is a maximum of 6°.
  • less compacted is meant that the second side is less compacted compared to the first side because it is not pressed against a smooth surface, for example.
  • At least two paper webs are arranged such that the first side of the first paper web forms the outer surface of the hollow body and that the first side of the second paper web forms the inner surface of the hollow body.
  • Fig. 1 shows an embodiment of a process scheme for the production of a nonwoven web and its drying to form a paper web
  • FIG. 2 shows a further exemplary embodiment of a process diagram for producing a fleece web and drying it to form a paper web
  • FIG. 3 shows three paper webs layered one on top of the other in a three-dimensional exploded view
  • 4 shows a further paper web made up into a paper strip
  • 5 shows a three-dimensional representation of a cellulose fiber-based drinking straw
  • FIG. 6 shows another cellulose fiber-based drinking straw in a three-dimensional representation
  • FIG. 7 shows a three-dimensional view of a paper web that has been stacked or folded.
  • the method for producing cellulose fiber-based drinking straws 1 begins, as is known, with the production of an aqueous suspension 3 comprising a cellulose material 2, with the optional addition of additives 4.
  • a cellulose mixture consisting of long-fiber sulphate cellulose and short-fibre cellulose, preferably short-fibre sulphate cellulose, with a length-weighted, average fiber length according to ISO 16065-2:2014 of 1.05 mm to 2. 5 mm can be provided.
  • the pulp mixture can be made up of 20 to 80% by weight of long-fiber sulphate pulp and 20 to 80% by weight of short-fibre cellulose, preferably short-fiber sulphate pulp.
  • a cellulose mixture of comminuted hardwood can be used as sulphate cellulose and comminuted softwood can be used as sulphate pulp.
  • comminuted softwood can be used as sulphate pulp.
  • This pulp mixture is prepared by a process comprising chemically treating the comminuted first and second pulp in a digester. Depending on the requirement, it can be useful if, after the chemical treatment, mechanical processing and defibration of an aqueous solids suspension of the pulp mixture is carried out in a high-consistency defibrator.
  • a consistency of the solids suspension prior to mechanical processing and defibration in the high-consistency pulper can be adjusted to 25% to 40%.
  • Such defibration in a high-consistency defibrator serves, among other things, to reduce the so-called splinter content of the pulp mixture, ie to break up pulp agglomerates that are still wood-like.
  • a consistency of the solids suspension prior to mechanical processing and grinding in the low-consistency refiner can suitably be adjusted to 2% to 6%. Provision can certainly also be made for only mechanical processing of the pulp mixture to be carried out in a high-consistency defibrator. In other cases, however, it can also be useful for defibration in a high-consistency defibrator to be superfluous and only mechanical processing of the pulp mixture to be carried out in a low-consistency refiner. The specific refining performance of the individual refining stages must be adapted to the selected pulp mixture and the desired paper parameters.
  • FIGS. 1 and 2 each show an exemplary embodiment of a process scheme for producing a nonwoven web 5 and drying it to form a paper web 8.
  • At least one aqueous suspension 3 comprising the cellulose material 2 is produced for further processing of the cellulose material 2.
  • This process step is shown in Figures 1 and 2, for example illustrated by means of a tank 28 with an agitator.
  • this at least one aqueous suspension 3 can be admixed with various additives 4 or aggregates and auxiliaries, such as fillers, starch, etc. that are customary in paper technology.
  • It can be the at least one suspension 3 as an additive 4 at least one sizing agent based on the active substance of Sizing agent in an amount of 0.07% by weight to 1.0% by weight based on 100% by weight of total dry matter of the at least one suspension 3 are added.
  • Sizes can be selected from a group consisting of alkenylsuccinic anhydride (ASA), alkyl ketene dimer (AKD), resin sizes or natural sizes, or a mixture of sizes selected from this group.
  • the consistency of the at least one aqueous suspension 3 can be reduced to a value of 0.15% to 0.8%, preferably from 0 .3% to 0.7% can be set.
  • the further processing of this at least one aqueous suspension 3 can then be carried out, as is known per se, by means of a paper machine 29, as is described roughly schematically below with reference to FIGS.
  • paper machines 29 may include a wire section 30, a press section 31 and a dryer section 32, each of these process steps being drying or dewatering operations.
  • At least the first side 6 of the at least one fleece web 5 is compressed before, during or after one of the drying steps and before further processing to form a cellulose fiber-based drinking straw 1 with a line load of 80 kN/m to 500 kN/m .
  • This compression step can either be generated in a single nip, i.e. compression step, or in several nips arranged one behind the other, each with the specified line loads.
  • the at least one aqueous suspension 3 comprising the cellulose material 2 can be applied to a circulating endless screen 33 of a screen section 30, as is known per se.
  • the at least one aqueous suspension 3 is moderated and pre-dried to form at least one water-containing nonwoven web 5.
  • the endless wire 33 can be guided over dewatering means 34 of the wire section 30, which dewatering means 34 can be formed by suction strips, for example.
  • dewatering in a wire section 30 can also take place solely by means of gravity.
  • the dewatering or pre-drying of the at least one Nonwoven web 5 are supported by generating a negative pressure.
  • the at least one first fleece web 5 comprising the cellulose material 2 can be pre-dried by means of the wire section 30, for example to a water content of 75% by weight to 85% by weight.
  • the at least one fleece web 5 can then be further dewatered or further dried by means of a press section 31, as shown in FIGS.
  • a press section 31 As shown in FIGS.
  • the nonwoven web 5 can be passed between rollers 35 of the press section 31 and thereby be further dewatered under pressure.
  • further drying can be supported by means of absorbent support material 36 .
  • felt mats for example, can be used for this purpose.
  • a press section 31 according to FIG. 1 can comprise more than just two rolls 35; in particular, a plurality of roll pairs formed by rolls 35 can be arranged one after the other.
  • a water content of the fleece web 5 after it has been passed through a press section 31 can be, for example, approximately 45% by weight to 65% by weight, based on the total mass of the fleece web 5 .
  • a so-called slalom dryer 37 can be arranged after the press section 31 as a drying section 32 or as part of a drying section 32 .
  • a slalom dryer 37 can comprise numerous rotating drying cylinders 15 over which the at least one nonwoven web 5 can be guided.
  • the drying cylinders 15 can be heated directly.
  • heating ducts (not shown in detail) can be designed to conduct superheated steam into the drying cylinder 15 .
  • the drying cylinder 15 can also be heated by means of an electrical resistance heater.
  • a temperature of the drying cylinders 15 of a drying section 32 can, for example, rise successively in the direction of passage of the at least one nonwoven web 5 .
  • the fleece web 5 can be dried by means of the slalom dryer 37, for example to a water content of 1% by weight to 10% by weight.
  • a so-called wide nip calender 9 or shoe calender with a shoe length of, for example, 50 mm and a shoe tilt of 24% can be used in the dryer section 32 downstream of a slalom dryer 37 Drying and compression of the fleece web 5 may be provided.
  • a shoe length of 75 mm and a shoe tilt of 24% can also be provided in a shoe calender, for example.
  • a wide nip calender 9 can essentially be formed by a heating roll 10 and by a shoe roll 12 cooperating with the heating roll 10 .
  • the shoe roll 12 can act as a flexible counter-pressure element for the heating roll 10 and can have a peripheral jacket 38 .
  • This peripheral jacket 38 interacts with the heating roller 10 and forms a wide nip 11 .
  • Temperatures on the surface of the heating roller can be from about 250°C to 295°C, for example. The temperature can be achieved, for example, using a thermal oil with a correspondingly higher oil flow temperature.
  • Other heating elements, such as induction heating, can also be provided to further stabilize the surface temperatures.
  • a second, advantageously structurally identical wide nip calender 9 is provided, which is arranged in the paper machine 29 in such a way that a so-called calendering of the second side 7 is carried out in addition to the calendering of the first side 6 of the at least one Fleece web 5 can be done.
  • FIGS. 1 and 2 thus shows a combined press section 31 and drying section 32 in the form of a Yankee cylinder 39 with an attached drying hood 16 or gas drying hood.
  • the at least one nonwoven web 5 adhering to a pick-up felt is pressed with its first side 6 by two pressure rollers 13 against the surface 14 of the steam-heated Yankee cylinder 39 and dried further or completely by additional blowing of hot air by means of the drying hood 16.
  • the end of the paper machines 29 shown as an example according to FIGS. 1 and 2 is represented by a winder 40, by means of which the finished at least one paper web 8 can be wound onto a roll. Alternatively, however, it is also conceivable and possibly also expedient if the at least one paper web 8 is fed directly to further processing or packaging.
  • the at least one suspension 3 can be produced with a consistency of 0.15% to 0.70%. Both high-consistency and low-consistency suspensions 3 can be used for arrangements based on FIG. 1 with a wide nip calender 9, while for an arrangement based on FIG. 2 with a Yankee cylinder 39, a low-consistency suspension 3 with a consistency of 0.15% to 0.30% may be more appropriate.
  • one, but also several, preferably three or also four, of the paper webs 8 produced according to the invention can be further processed into a cellulose fiber-based drinking straw 1 .
  • one or more paper webs 8 made from the same cellulose material 2, ie several identical paper webs 8, can be layered one on top of the other.
  • a single paper web 8 can also be further processed, for example, by a corresponding single or multiple fold.
  • a single paper web 8 can be folded several times in a zigzag or meandering manner, so that a quasi multi-layered or stacked paper web 8 is formed.
  • FIG. 7 in a schematic three-dimensional view. With such a fold, the compressed first side 6 contacts each other and the non-compacted second side 7 contacts each other.
  • a similar paper strip 18, as exemplified by FIG. larisch outlined and described below, are manufactured.
  • a strip of paper folded in this way consisting of the paper according to the invention can be fixed in its position by means of appropriately selected adhesive points using an adhesive 17 .
  • An adhesive 17---- which is not explicitly shown in FIG. 7--can be applied for this purpose, for example, over the entire surface, at points, or else in strips between the folded layers.
  • FIG. 3 shows three paper webs 8 layered one on top of the other in a three-dimensional exploded view.
  • a smaller or larger number of paper webs 8 can of course also be provided. It can be useful if the uppermost of the three paper webs 8 shown was compressed on a paper machine 29 with a wide nip calender 9 and if the middle and the lower paper web 8 were compressed on an MG machine using a Yankee cylinder 39.
  • An arrangement of three layered Textilbah NEN 8 with a compressed by means of a Yankee cylinder 39, uppermost paper web 8 and each with a compressed by means of a wide nip calender 9 middle and lower paper web 8 can be useful.
  • the paper webs 8 can be layered one on top of the other, as shown in FIG.
  • an uncompacted second page 7 can also be a page that is less compressed than the compressed first page 6 .
  • At least one layer is made of the paper produced according to the invention in an arrangement of several paper webs 8 .
  • both of the paper webs 8 lying on the outside of the finished cellulose fiber-based drinking straw 1 are produced according to the method according to the invention. It can be useful if the compressed first page 6 is in direct contact with a liquid.
  • various parameters or product properties such as optical properties such as gloss, printability, feel and the like, can be set accordingly in an advantageous manner.
  • the paper webs 8 can be glued to one another, with an adhesive 17 being applied over the entire surface or in sections to the contacting sides 6, 7 of the paper webs 8 who can.
  • FIG. 3 shows that the adhesive 17 can be applied in strips and approximately symmetrically to one side 6, 7 of a paper web 8 in each case.
  • the adhesive 17 can be applied over the entire surface and to each contacting side 6, 7 or only at certain points or along the edges of the sheet.
  • the adhesive 17 is a food-safe, biological biodegradable glue of animal and/or plant origin is used.
  • Different legal requirements and recommendations apply to the harmless use of paper, cardboard and cardboard that is intended for direct contact with food.
  • Recommendation XXXVI of the Federal Institute for Risk Assessment and also Recommendation XXXVI/1 for boiling and hot filter papers should be consulted. Regulation (EC) No. 1935/2004 and the Food, Consumer Goods and Feed Codes are examples of these.
  • a single paper web 8, but also paper webs 8 layered in the sense of FIG. 3, can be made up into paper strips 18 in the course of further processing into a cellulose fiber-based drinking straw 1.
  • a further paper web 8 made up into a paper strip 18 is shown in FIG.
  • a paper strip 18 can be delimited by two longitudinal edges 19 and two transverse edges 20, it being possible for an overlapping region 21 to be formed in the region of each of the two longitudinal edges 19.
  • the length 41 of such a paper strip 18 can correspond to a multiple of the length 25 of a finished cellulose fiber-based drinking straw 1 .
  • Possible positions for subsequent cutting areas are shown in FIG. 3 by dashed lines.
  • the first side 6 of the at least one paper web 8 to be printed with food-safe and biodegradable inks before further processing into a cellulose-fiber-based drinking straw 1 .
  • FIGS. 5 and 6 also show two conceivable embodiments of cellulose fiber-based drinking straws 1 in a three-dimensional representation, the cellulose fiber-based drinking straws 1 comprising a preferably cylindrical hollow body 23 which is open on both sides and has an outer jacket surface 26 and an inner jacket surface 27 . It is provided that the hollow body 23 is formed by at least one shaped paper strip 18 , the at least one paper strip 18 being made up of at least one paper web 8 with at least one compressed first side 6 .
  • drinking straws 1 with a canted or polygonal cross-section are also conceivable, for example.
  • a preferably cylindrical hollow body 23 open on both sides can be formed, wherein the at least one paper strip 18 can be shaped in such a way that an overlapping section 24 is formed by overlapping the two overlapping areas 21.
  • the cylindrical hollow body 23 can subsequently be cut approximately or largely radially to the drinking straw axis 22 into a finished length 25 of, for example, 5 cm to 50 cm.
  • the at least one paper strip 18 can be shaped in such a way that its two longitudinal edges 19 essentially run parallel to the axis 22 of the drinking straw, as is shown schematically in FIG. Alternatively, FIG. 6 shows that it is also conceivable for the two longitudinal edges 19 to run essentially spirally or helically around the axis 22 of the drinking straw.
  • the two overlapping areas 21 can be glued together in the overlapping section 24 .
  • At least two paper webs 8 can be arranged such that the first side 6 of the first paper web 8 forms the outer surface 26 of the hollow body 23 and that the first side 6 of the second paper web 8 forms the inner surface 27 of the hollow body 23 . It can be the case here that one or more further paper webs 8 are formed between the two outer ones, ie between the first and the second paper web 8 . With these internal ones or intermediately layered paper webs 8 can be paper webs 8 according to the invention, as well as various other papers with optionally additional advantageous properties.
  • At least two paper webs 8 are arranged in such a way that the second side 7 of the first paper web 8 that is uncompacted or compressed to a lesser extent than the first side 6 forms the outer surface 26 of the hollow body 23 and that the uncompacted side or, compared to the first page 6 less compressed second page 7 of the second paper web 8, the inner surface 27 of the hollow body 23 forms.
  • the compressed first side 6 of the at least one paper web 8 or of the paper webs 8 can have a Cobb 1800s value according to ISO 535:2014 of 24 to 62 g/m 2 .
  • a difference in a Cobb 1800s value according to ISO 535:2014 can advantageously be a maximum of 4 g/m 2 between the compressed first side 6 and the second side 7 that is not compressed or compressed to a lesser extent.
  • the compressed first side 6 of the paper web(s) 8 can have a Bendtsen roughness according to ISO 8791-2:2013 of 30 to 250 ml/min. It can also be advantageous if the paper web(s) 8 have a gloss value according to TAPPI 480 of 20 to 35%.
  • the compressed first side 6 of the paper web(s) 8 can have a static contact angle according to ISO 19403-2:2020 with water as the test liquid of 100° to 120°.
  • a difference in a static contact angle according to ISO 19403-2:2020 using water as the test liquid can be a maximum of 6° between the compressed first side 6 and the second side 7 that is not compressed or less compressed.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

L'invention concerne un procédé pour produire des pailles (1) à base de fibres cellulosiques et une paille (1) à base de fibres cellulosiques. Ce procédé comprend les étapes qui consistent : à fournir un matériau de type cellulose (2) ; à produire au moins une suspension aqueuse (3) renfermant ce matériau de type cellulose (2) et à ajouter éventuellement des additifs (4) à la suspension aqueuse (3) ; à mélanger la ou les suspension(s) aqueuse(s) (3) de manière homogène et à réaliser un pré-séchage pour obtenir au moins une bande de non-tissé (5) renfermant de l'eau qui présente un premier côté (6) et un deuxième côté (7) ; à faire sécher cette ou ces bande(s) de non-tissé (5) renfermant de l'eau au cours de plusieurs étapes de séchage pour obtenir au moins une bande de papier (8) présentant un premier côté (6) et un deuxième côté (7) ; à procéder à un traitement ultérieur de cette ou ces bande(s) de papier (8) de manière à obtenir une paille (1) à base de fibres cellulosiques. Selon l'invention, au moins le premier côté (6) de la ou des bande(s) de non tissé (5) est comprimé avant, pendant ou après l'une des étapes de séchage et avant le traitement ultérieur pour former une paille (1) à base de fibres cellulosiques, au moyen d'une charge linéaire comprise entre 80 kN/m et 500 kN/m.
PCT/AT2021/060240 2020-07-10 2021-07-06 Procédé pour produire des pailles à base de fibres cellulosiques WO2022006608A1 (fr)

Priority Applications (3)

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US18/004,887 US20240018724A1 (en) 2020-07-10 2021-07-06 Method for producing a cellulose-fibre-based drinking straw
CN202180045748.1A CN115867706A (zh) 2020-07-10 2021-07-06 生产基于纤维素纤维饮管的方法
EP21754888.2A EP4179144A1 (fr) 2020-07-10 2021-07-06 Procédé pour produire des pailles à base de fibres cellulosiques

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ATA50604/2020 2020-07-10
ATA50604/2020A AT523915B1 (de) 2020-07-10 2020-07-10 Verfahren zur Herstellung von Cellulosefaser-basierten Trinkhalmen

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US20240018724A1 (en) 2024-01-18
AT523915A4 (de) 2022-01-15
EP4179144A1 (fr) 2023-05-17
CN115867706A (zh) 2023-03-28

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