WO2013050810A1 - Procédé pour la formation d'une bande continue de matière fibreuse compactée transversalement avec accroissement de voluminosité et d'extensibilité, et appareil pour la mise en œuvre du procédé - Google Patents

Procédé pour la formation d'une bande continue de matière fibreuse compactée transversalement avec accroissement de voluminosité et d'extensibilité, et appareil pour la mise en œuvre du procédé Download PDF

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Publication number
WO2013050810A1
WO2013050810A1 PCT/IB2012/000380 IB2012000380W WO2013050810A1 WO 2013050810 A1 WO2013050810 A1 WO 2013050810A1 IB 2012000380 W IB2012000380 W IB 2012000380W WO 2013050810 A1 WO2013050810 A1 WO 2013050810A1
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WO
WIPO (PCT)
Prior art keywords
belt
elastic
fibrous material
base web
conveyor belt
Prior art date
Application number
PCT/IB2012/000380
Other languages
English (en)
Inventor
Giorgio Trani
Marion Sterner
Original Assignee
Giorgio Trani
Marion Sterner
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 Giorgio Trani, Marion Sterner filed Critical Giorgio Trani
Priority to EP12710546.8A priority Critical patent/EP2681042A1/fr
Publication of WO2013050810A1 publication Critical patent/WO2013050810A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/12—Crêping
    • B31F1/18—Crêping by tools arranged in the direction of web feed ; Longitudinal crêping, i.e. providing paper with crêpes parallel to the direction of web movement, e.g. for making paper elastic transversely to this direction
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/005—Mechanical treatment
    • 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
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D04H1/43838—Ultrafine fibres, e.g. microfibres

Definitions

  • the present invention relates to a method for forming a web of transversely compacted fibrous material with voluminosity and extensibility increase, and an apparatus for implementing the method.
  • Methods for producing fibrous webs, and particularly paper webs consist generally of pouring a mix of fibrous material and water onto an endless conveyor belt while in movement. This mix is progressively deprived of its water content thereon and is subjected to a series of traditional operations aimed at finally obtaining a paper web or more generally a web of fibrous material to be then wound into rolls for subsequent use.
  • fibrous webs in particular paper webs of the most varied types, involves a high cost in terms of energy consumption (drying) and requires the use of many types of chemical products as additives to confer particular properties on the various paper types or to facilitate the process.
  • additives are added to the mix during production (for example retention agents, mineral fillers, resins for moisture resistance, etc.) or to the surface (for example adhesives, glaze, etc.).
  • the subsequent use to which a paper roll is subjected can include printing on the paper web or its transformation via successive passages through paper working machines.
  • printing generally requires precise formats which are often not submultiples of the width of the continuous web obtained from the paper machine.
  • the various manufactured paper products are obtained starting from a continuous paper web which is not always used in the format made available by the paper works, but has to be cut and can involve wastage due to the scrap.
  • the fibrous web production process on a continuous machine gives the fibres a preferential orientation in the ' production direction.
  • This preferential orientation causes material anisotropy, i.e. of the different physico-mechanical properties in the production direction compared with the transverse direction. For example, the tensile strength and the rigidity are greater in the longitudinal direction; elongation, tearing resistance and hygroexpansivity are higher in the transverse direction.
  • Other factors contributing to anisotropy of the paper material are the traction to which the fibrous web is subjected along the continuous machine and the transverse contraction which it undergoes on drying. These factors introduce tensions among the interfibre bonds which are differently distributed in the two directions.
  • the longitudinal preferentiality in the fibre orientation direction and the consequent anisotropy of the paper web is one of the main causes of paper planarity defects.
  • the problem is highlighted if there is a difference between the relative humidity of the environment and that of the paper at equilibrium. In this respect, the fibres tend to swell more in their length direction.
  • the paper sheets can be deformed and not properly stretched.
  • voluminosity thickness/surface density ratio
  • voluminosity increases the paper compressibility, facilitating its adaptation and contact with an inking form and hence increasing ink transfer in a printing process.
  • Voluminosity is also required in the tissue paper sector to provide softness and liquid absorption capacity.
  • Methods and apparatus are already known for forming sheets and webs of paper material compacted transversely, i.e. in a direction perpendicular to that which will be defined as the "machine direction". These are based on the known principle of causing a base web of pliable fibrous material, having a high moisture content, to adhere to an elastic conveyor belt, temporarily and locally prestretched transversely, i.e. perpendicular to the advancement direction of said conveyor belt, such that when this returns to its original configuration, the base web of pliable fibrous material, which is to form the fibrous material product web, is compacted transversely such that on the one hand it enables its thickness to be increased and on the other hand enables it to present extensibility characteristics.
  • international patent application WO 2010/015614 describes a method by which the transverse prestretch of the elastic conveyor belt is achieved by using a pair of rollers to urge the belt between a pair of circumferential grooves provided in them.
  • the interference between the pair of thrust rollers and the transmission roller causes transverse stretching of the elastic belt, this stretch being localized within the interference zone alone and is temporary, in that as soon as the elastic belt abandons this zone it is no longer stressed and rapidly re-assumes its original shape, to entrain with it the base web of paper material positioned on it.
  • the present invention is based on this known principle and improves it in the sense of simplifying its practical implementation and enabling webs of fibrous material in general, and in particular of paper material, to be obtained with a higher degree of transverse compaction, with the facility to modify it on the basis of requirements and to integrate it with further special characteristics linked to specific uses of the web.
  • FR 1388160 describes a method comprising the steps of continuously feeding an aqueous fibre suspension onto a continuously moving support to form a web of fibres thereon, reducing the water content of the web, and transversely stretching the support.
  • An object of the invention is therefore to obtain transversely compacted, stabilized webs of fibrous material.
  • Another object of the invention is to form a web of fibrous material having high voluminosity, in terms of the thickness/surface density ratio.
  • Another object of the invention is to form a web of fibrous material having a fibre orientation which is more homogeneous and less unbalanced in the machine direction, and consequently with more isotropic properties (mechanical, hygroscopic, dimensional stability, etc.).
  • Another object of the invention is to form a web of fibrous material having controlled porosity.
  • Another object of the invention is to form a web of fibrous material having a controlled additive concentration along the web thickness.
  • Another object of the invention is to form a web of fibrous material the mechanical, optical and porosity characteristics of which can be mutually controlled and balanced more finely and flexibly than with traditional methods.
  • Another object of the invention is to optimize the consumption of chemical products for modifying the characteristics of said web, including with products not traditionally used in the paper industry.
  • the method of forming webs of transversely compacted fibrous material with voluminosity and extensibility increase is as described in claim 1.
  • the apparatus for implementing the method is as described in claim 18.
  • Figure 1 is a schematic perspective view showing the principle on which the method of the invention is based
  • Figure 2 is a vertical cross-section through an elastic conveyor belt associated with two extenders shown in the non-active condition
  • Figure 3 shows it in the same view as Figure 2 but with the two extenders in the active condition
  • Figure 4 is a perspective view showing a conveyor belt portion subjected to two successive localized extension steps
  • Figure 5 is a perspective view showing a conveyor belt portion also subjected to localized longitudinal stretching in a different embodiment
  • Figure 6 is a perspective view showing a conveyor belt portion subjected to transverse stretching with controlled return.
  • the method of the invention is applied to an elastic conveyor belt 2 supported by a support structure indicated overall by 4 and consisting of a plurality of inverted U elements 6, with a crosspiece 8 and with a pair of legs 10 provided, at their lower end, with a base 12 for support on and/or fixing to the floor.
  • the elastic belt can consist of one or more layers of possibly expanded elastomer, or of single or multiple fabric formed of threads which may be elastic, or non-elastic but woven in accordance with an elastic weave, or finally of a composite layer formed from the preceding.
  • a further bar 14 is fixed lowerly to the crosspiece 8 of each U element
  • a pneumatic cylinder 20 internally housing two pistons with their piston rods 22 emerging from both its ends.
  • Each of these piston rods 22 supports at its outer end a second guide rail 24 for the said carriages 28 which are constrained to the longitudinal edges of the belt 2, and also supports, in proximity to said end, a roller 26 of vertical axis.
  • the elastic belt 2 is retained with the carriages 28, provided on its longitudinal edges, by said pieces 16, 24, although being able to slide relative to them, and is maintained bent at said rollers 18, 16 such as to assume a C cross-section, with the opening facing downwards for the upper part and upwards for the lower part, as visible in Figures 2 and 3.
  • a continuous base web 30 of pliable fibrous material having a water content between 5 and 95% is deposited on that section of the elastic belt 2 which, after being stretched transversely by passage in correspondence with the pair of rollers 26, begins its return to its original configuration.
  • the belt 2 can totally or partly form the so-called flat table, which in a traditional paper making machine receives the mix originating from the feed box.
  • This fibrous material can consist of cellulose fibres if a paper web is to be obtained, or of cellulose fibres and polymer fibres, or polymer fibres alone, if a non-woven web is to be obtained.
  • the elastic return of the belt into its original configuration entrains with it the base web of fibrous material 30, which in this manner is subjected to transverse compacting and, by virtue of the presence of a roller 32 of horizontal axis in that section immediately downstream of the zone of return to the original configuration, is kept adhering to the elastic belt 2, and at the same time is subjected to partial drying.
  • the base web 30 of fibrous material can undergo in the longitudinal direction an action opposite to that undergone transversely, due to the simultaneous longitudinal re-extension of the released elastic belt 2, if this has a normal Poisson deformation coefficient (for example around 0.5).
  • simultaneous longitudinal deformation of the belt 2 can be prevented if this is filled with longitudinally disposed reinforcement fibres (for example Kevlar, carbon), or if it is formed with a material having a Poisson coefficient ideally close to zero.
  • the elastic conveyor belt 2 can consist of one or more layers of elastomer, possibly expanded, or of single or multiple fabric of elastic yarns or even non-elastic yarns if woven with an elastic weave, or can consist of a layer composed of all of the preceding.
  • It can be permeable to fluids and contain a sponge layer able to absorb and/or release liquids.
  • the elastic belt 2 is preferably made of a liquid permeable material which, in that section in which it reassumes its original configuration, is provided in its lower surface with a suction port 34 which extends transversely for about the entire width of the elastic belt 2 and has the double function of maintaining the base web 30 of fibrous material adhering to said belt during transverse compaction while at the same time removing a part of the moisture contained therein.
  • the material forming the elastic belt 2 can be made starting from a mixture of elastic material (rubber) and cellulose in the form of fibres, microcrystals (microcrystalline cellulose) or nanofibres (nanocellulose).
  • the cellulose fibres or nanofibres can be bonded to the elastic surface by suitable binders, such as latex or adhesion promoters based, for example, on silicates and titanates.
  • suitable binders such as latex or adhesion promoters based, for example, on silicates and titanates.
  • this latter can be subjected to corona treatment or generally to plasma treatment.
  • An elastic fabric composed partly of cotton can also be used as the material forming the elastic belt 2.
  • the elastic belt 2 can also be covered or impregnated with a gum latex of low glass transition temperature, such as those used for pressure-sensitive adhesives, traditionally used for post-it pads. Finally, the elastic belt 2 can be covered or impregnated with formulations typically used for increasing the adhesion of the fibre web to the Yankee cylinder used in producing tissue paper.
  • said base web can be pressed against said conveyor belt with a smooth flat or cylindrical (roller) surface; and said belt can also comprise on its surface a plurality of microhooks to favour the gripping of the fibrous base web 30 to the elastic belt 2.
  • the invention also provides for the use of fixed or rotatable mechanical pressing elements provided with low friction surfaces, or with felts, or of other endless belts, possibly elastic.
  • a single felt can be used, maintaining the base web 30 adhering to the conveyor belt 2 during transverse compaction, or two felts can be used, between which the base web 30 is interposed, withdrawn from the conveyor belt 2 on termination of the or of each transverse compaction step.
  • suitable auxiliary conveyor belts can perform the function of felts for partially removing water from the base web 30 between one transverse stretching step and the next.
  • said surfaces can be driven at the same velocity, or at different velocities, such as to cause a voluminosity increase in the fibrous base web 30 interposed between them.
  • Both the conveyor belt 2 and the felt or endless belt can also have their surface functionalised such as to present a high affinity for cellulose.
  • these exert on the base web, which is still very moist and pliable, a traction along the direction of its thickness (direction Z), so increasing its thickness and hence its voluminosity.
  • the affinity of the two surfaces for cellulose can be calibrated differentially to cause preferential detachment from one of the two surfaces and obtain a calibrated traction along the direction Z. Detachment of the base web 30 can also be facilitated by doctor blades, by air blades, or by air blown through the lower and upper belts at the detachment point.
  • the web which leaves this transverse compaction step can be fed to the subsequent stages of a traditional process for obtaining a web of fibrous paper material, or can be subjected to further transverse compaction steps, by a repeat of the aforedescribed method, as best seen in Figure 4.
  • Each station comprises a transversely extended section of the elastic belt 2, a zone in which the base web 30 of fibrous material falls onto the section in which the belt 2, which has just been extended, begins to return to its original configuration, a squeezing zone in which, immediately downstream of said zone of return to the original configuration, a transverse roller 32 is provided, the function of which is to maintain adhering to the belt 2 the base web 30 of fibrous material which has just been subjected to transverse compaction, and to at least partially remove the moisture contained therein, and a subsequent zone for detaching the already partly transversely compacted web of fibrous material under formation.
  • the base web 30 of fibrous material after each transverse compaction step the base web 30 of fibrous material must be detached from the belt 2, so as not to nullify the already achieved transverse compaction when the belt is subjected to the next transverse stretching step.
  • This can be advantageously achieved by causing the base web 30 of fibrous material to advance between two successive compaction steps on a conveyor belt 36 travelling parallel above the belt 2.
  • the base web 30 of fibrous material can also be subjected before or after any compaction step to wetting or addition of suitable substances for modifying the base web characteristics.
  • This enables the method to be applied to already formed paper webs.
  • pairs of extender rollers 26', 26" can be provided, of which that 26" positioned downstream is operated at greater peripheral velocity than that 26' positioned upstream. This can be obtained by using roller pairs 26', 26" of equal diameter, operated at different angular velocities (see Figure 4) or by using roller pairs 26', 26" of different diameter, operated at the same angular velocity (see Figure 5).
  • the belt 2 is subjected in that section between the two rollers 26', 26" of each pair to longitudinal stretching, which with the elastic return causes longitudinal compaction of the base web 30 of fibrous material. It follows that this base web 30 on the one hand undergoes a thickness increase, and on the other hand acquires a capacity to extend both transversely and longitudinally.
  • the base web 30 of fibrous material can be also advantageously subjected in any step of the process, either inside or outside the machine, to different treatments with liquid or powder substances or with atmospheric plasmas.
  • a re-wetting treatment can be provided by spraying or by passage through a bath, the treatment liquid consisting of water, a dye substance or an impermeabilizing or other substance, according to the properties which the paper material obtained is required to present.
  • That section of the conveyor belt 2 subjected to stretching can have a corresponding length, obtainable by several successive pairs of rollers 26.
  • the width of the conveyor belt 2 can be large, it can be supported on transverse support rollers. These can have a smooth outer surface or be provided with helical ribs winding in opposite directions in the two halves of the rollers, to facilitate and make uniform the transverse stretching of the belt, and also possible longitudinal stretching by being rotated at greater peripheral speed than the speed of advancement of the belt.
  • the invention also provides for controlling its elastic return and in particular for slowing it down according to requirements.
  • This can in particular be achieved by providing the, or each, transverse stretching station for the belt 2 with not a single pair of rollers 26 spaced apart by a distance corresponding to the extent of transverse stretch to be imparted, but with several pairs of rollers spaced apart by a decreasing distance conforming to the elastic pattern desired.
  • Figure 6 schematically shows this principle.
  • the restraint between the longitudinal edges of the belt 2 and the support structure 4 can also be obtained by thickening the edges of the belt 2 and by longitudinally open tubular guide pieces rigid with the structure 4 instead of by carriages constrained to the belt edges and by guide rails 16, 24 connected to the structure 4.
  • These guide pieces can be advantageously provided with rolling bearings or with ball bearings or the like, to reduce the inevitable friction, which can be considerable in the case of conveyor belts 2 of considerable length.
  • the two sections, upper and lower, of the elastic belt 2 extend horizontally overall; however according to the invention they can also extend inclined, preferably upwards, in order to facilitate dispersal of the water left by the fibrous base web 30 during treatment.
  • the fibrous material web under formation can be disposed on a horizontal conveyor belt virtually of any length enables action to be taken along it to carry out any treatment on the web (drying, impregnation, coupling, etc.).
  • the fibrous material web 30 can be subjected before, during or after any mechanical deformation step, to wetting or to addition of suitable substances to modify the web characteristics.
  • This enables the method to be applied to already formed paper webs, and to optimize the additive addition efficiency, hence limiting liquid effluent production.
  • Incompatibility between he additives in solution or suspension (for example because of pH incompatibility or because they would form a gel or precipitate) can be avoided by adding them in different stages. In this manner for example a gel could be formed directly within the fibrous base web by adding two gelling components separately, such as alginate and calcium ions.
  • This additive addition can consist of spraying, of deposition by rollers, of impregnation with liquid formulations released from a sponge layer forming part of the elastic belt, or other methods known to the expert of the art.
  • the degree of dryness of the fibrous base web is chosen on the basis of the additive to be added, the uniformity of surface distribution, the penetration along the thickness of the base web and/or the final effect to be obtained. In particular, greater control of the degree of surface distribution (including regulated addition) and of the penetration of the additive along the thickness of the fibrous base web can be achieved.
  • Additives in powder form are preferably dispersed in water and mixed with binding agents, such as cationic polymers, nanocellulose, polyglycols, acrylic dispersions, styrene-butadiene dispersions, etc.
  • binding agents such as cationic polymers, nanocellulose, polyglycols, acrylic dispersions, styrene-butadiene dispersions, etc.
  • Said additives can also be activated by administering energy from the outside (heat, UV or visible radiation, microwaves, electron beam, etc.), and provide the required effect only after activation (including outside the paper machine).
  • the additives can be encapsulated in miocrocapsules added to the fibrous base web and of which the capsule shell can be broken successively by applying pressure or heat, in order to cause release of the additive at the required moment.
  • the various additives must be able to perform their function and be activated, if necessary, without mutual interference.
  • the additives to be added can provide properties such as:
  • porosity control surface porosity is essential for determining the capacity to filter ink pigments from their carrier and hence for print quality along the thickness with additives such as:
  • - mineral fillers generated in situ by precipitation such as precipitated CaC03 to which a calcium bicarbonate solution is added and water and carbon dioxide removed by heating; the solution can contain binders and/or substances able to influence the morphology of the precipitated CaC03 crystals),
  • additives such as:
  • waxes including natural waxes, preferably in dispersion
  • hydrophilicity with additives such as:
  • additives such as:
  • adhesive curing rate particularly polyurethane based, with additives such as:
  • biodegradable susceptors able to convert electromagnetic energy at radio frequency or microwaves into heat.
  • the susceptors can be added in mixture with nanocellulose such as to be able to achieve effective drying of this latter.
  • oxygen scavengers • oxygen scavengers, with additives such as:
  • the method of the invention is particularly advantageous, in that it is simple to implement, it does not require complex and costly apparatus, it maintains a high fibrous web production rate and is quickly adapted to operational requirements, and in particular to the degree of extensibility required for the paper.
  • it enables both the number of transverse and possibly longitudinal compaction stations to be varied vary quickly and easily, and the extent of compaction obtainable in each station.
  • the possibility of having the forming fibrous web disposed on a horizontal conveyor belt practically of any length enables action to be taken along it to carry out any treatment on the web (drying, impregnation, coupling, etc.).
  • the machine implementing the method of the invention can be advantageously combined with traditional crinkling and tampering machines to obtain fibrous webs which can be stretched longitudinally utilizing the properties of the expandable folds, and can also be stretched transversely to utilize the extensibility of the fibrous material in that direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne un procédé pour la formation de bandes continues de matière fibreuse compactées transversalement avec accroissement de voluminosité et d'extensibilité, à partir d'une bande continue de base initiale (30) de matière fibreuse souple ayant une teneur en eau comprise entre 5 et 95 %, placée sur une bande transporteuse élastique sans fin (2) entraînée vers l'avant le long d'une structure de support (4) et soumise à au moins une extension transversale temporaire localisée. Le procédé est caractérisé en ce qu'il consiste à entraîner l'extension d'une section sensiblement plate de ladite bande transporteuse par un passage en correspondance avec au moins une paire d'éléments d'extension (26) qui sont fixes par rapport à ladite structure de support et agissent simultanément et dans des direction opposées à proximité des bords longitudinaux de ladite bande transporteuse (2) dans une direction parallèle à la surface de ladite section sensiblement plate, suivie du dépôt de ladite bande continue de base (30) de matière fibreuse sur ladite section dès qu'elle commence à effectuer un retour élastique vers sa configuration initiale, et en effectuant un traitement partiel de séchage et d'élimination d'humidité lors de cette étape.
PCT/IB2012/000380 2011-03-04 2012-02-27 Procédé pour la formation d'une bande continue de matière fibreuse compactée transversalement avec accroissement de voluminosité et d'extensibilité, et appareil pour la mise en œuvre du procédé WO2013050810A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12710546.8A EP2681042A1 (fr) 2011-03-04 2012-02-27 Procédé pour la formation d'une bande continue de matière fibreuse compactée transversalement avec accroissement de voluminosité et d'extensibilité, et appareil pour la mise en uvre du procédé

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVE2011A000013 2011-03-04
IT000013A ITVE20110013A1 (it) 2011-03-04 2011-03-04 Metodo di realizzazione di un nastro di materiale fibroso compattato trasversalmente, con aumento di voluminosita' e di estensibilita' ed apparecchiatura per attuare il metodo.

Publications (1)

Publication Number Publication Date
WO2013050810A1 true WO2013050810A1 (fr) 2013-04-11

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EP (1) EP2681042A1 (fr)
IT (1) ITVE20110013A1 (fr)
WO (1) WO2013050810A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2785522B1 (fr) * 2011-11-30 2020-07-29 Trani, Giorgio Appareil multifonctions de traitement de bandes de matériaux fibreux et / ou malléable

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH252766A (de) * 1945-01-08 1948-01-31 Lilla Edets Pappersbruks Aktie Vorrichtung zum Kreppen von Folien mittels eines Bandes aus dehnbarem Material.
FR1388160A (fr) 1963-01-22 1965-02-05 Huyck Corp Procédé et dispositif pour la fabrication du papier
WO2010015614A1 (fr) 2008-08-07 2010-02-11 Giorgio Trani Procédé de fabrication de films de matériau fibreux extensible transversalement, en particulier de papier, et appareil de mise en œuvre du procédé

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH252766A (de) * 1945-01-08 1948-01-31 Lilla Edets Pappersbruks Aktie Vorrichtung zum Kreppen von Folien mittels eines Bandes aus dehnbarem Material.
FR1388160A (fr) 1963-01-22 1965-02-05 Huyck Corp Procédé et dispositif pour la fabrication du papier
WO2010015614A1 (fr) 2008-08-07 2010-02-11 Giorgio Trani Procédé de fabrication de films de matériau fibreux extensible transversalement, en particulier de papier, et appareil de mise en œuvre du procédé

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2785522B1 (fr) * 2011-11-30 2020-07-29 Trani, Giorgio Appareil multifonctions de traitement de bandes de matériaux fibreux et / ou malléable

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EP2681042A1 (fr) 2014-01-08
ITVE20110013A1 (it) 2012-09-05

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