EP1485536A2 - Veil with a pvoh fibre binding agent - Google Patents

Veil with a pvoh fibre binding agent

Info

Publication number
EP1485536A2
EP1485536A2 EP03735782A EP03735782A EP1485536A2 EP 1485536 A2 EP1485536 A2 EP 1485536A2 EP 03735782 A EP03735782 A EP 03735782A EP 03735782 A EP03735782 A EP 03735782A EP 1485536 A2 EP1485536 A2 EP 1485536A2
Authority
EP
European Patent Office
Prior art keywords
filaments
veil
pvoh
weight
binder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03735782A
Other languages
German (de)
French (fr)
Other versions
EP1485536B1 (en
Inventor
Michel Droux
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Gobain Adfors SAS
Original Assignee
Saint Gobain Vetrotex France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Saint Gobain Vetrotex France SA filed Critical Saint Gobain Vetrotex France SA
Publication of EP1485536A2 publication Critical patent/EP1485536A2/en
Application granted granted Critical
Publication of EP1485536B1 publication Critical patent/EP1485536B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/16—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
    • 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/36—Inorganic fibres or flakes
    • D21H13/38—Inorganic fibres or flakes siliceous
    • D21H13/40—Inorganic fibres or flakes siliceous vitreous, e.g. mineral wool, glass 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
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/12—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials
    • D21H5/1245—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of long or continuous filaments
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
    • Y10T442/102—Woven scrim
    • Y10T442/133—Inorganic fiber-containing scrim
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
    • Y10T442/102—Woven scrim
    • Y10T442/133—Inorganic fiber-containing scrim
    • Y10T442/148—Including a coating or impregnation containing particulate material other than fiber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2861—Coated or impregnated synthetic organic fiber fabric
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2926—Coated or impregnated inorganic fiber fabric
    • Y10T442/2992—Coated or impregnated glass fiber fabric

Definitions

  • the invention relates to a process for manufacturing a fiber veil, the binder of which is derived from polyvinyl alcohol (PVOH) fibers.
  • the veil produced according to the invention can in particular be used as a surface covering (“wall covering”). For this application, it can be glued to walls on one side using a water-based glue and receive a paint (with water or organic solvent) on the other side.
  • veil is meant a veil made of completely dispersed filaments.
  • a veil has a surface mass ranging from 10 to 60 g / m 2 and more particularly 20 to 40 g / m 2 , for example around 30 g / m 2 .
  • the manufacture of a continuous veil involves the passage of a bed of dispersed filaments by a set of several successive devices each having to apply a specific treatment to said filaments.
  • the fiber bed after its formation in a "formation device”, then passes through a "binder depositing device” then a “steaming device”.
  • the transport of the bed through these devices is carried out using scrolling belts, and the bed is generally caused to pass from one carpet to another.
  • the veil in formation tends to lose its cohesion, which results in structural defects of the final veil such as an irregular grammage.
  • the continuous process according to the invention comprises: a step of dispersing cut filaments and staple fibers of PVOH in process water, then a step of forming a bed in a formation device by passage dispersion on a forming fabric through which the process water is drained, the filaments and fibers being retained on said fabric, then,
  • the invention overcomes the above-mentioned problems.
  • the PVOH fiber used at the outset acts as a binder for the web, it is not necessarily necessary to use a device for applying a binder, which implies that the sailing has fewer “carpet jumps” to perform.
  • the Applicant has discovered that the PVOH fibers give solidity to the bed in formation, probably because the PVOH fiber gives tackiness to the various bed ingredients and maintains them. As a result, the bed is less damaged when the carpet is thrown.
  • the filaments To be dispersed in water, the filaments must be able to remain in the individual state and not to combine mixed in the process water. If chopped strands, a set of filaments, are dispersed in water, these strands must be able to defilamentize in dispersion in water. “Yarn” is understood to mean a set of contiguous filaments and more particularly comprising from 10 to 2000 filaments. Thus, the filaments, more particularly those made of glass, can be introduced into the process water in the form of wires comprising more particularly 10 to 2000 filaments.
  • the filaments which can be used in the context of the present invention generally comprise glass filaments and are more particularly glass filaments, which can be used during dispersion in the form of chopped strands.
  • the filaments may have been sized during their manufacture, to be collected if necessary in the form of threads, in particular by sizing liquids comprising an organosilane and / or a tackifier ("film former" in English). In this case, it is preferable not to dry the filaments before dispersing them in water, so as to avoid sticking the filaments together, which would hinder their dispersion in the form of individual filaments.
  • cut filaments in addition to glass filaments, it is also possible to use cellulose fibers (or “cellulose filaments” as a synonym) and / or polyester filaments, in particular polyethylene terephthalate (PET).
  • cellulose fibers or “cellulose filaments” as a synonym
  • polyester filaments in particular polyethylene terephthalate (PET).
  • Cellulose fibers are generally obtained from wood pulp. This wood pulp is generally obtained from commercial sheets of cardboard which are softened with water. This water used to soften the cardboard is then used to transport the pulp to the installation for producing the dispersion. This water / pulp mixture generally contains just enough water to be able to transport the pulp by flow. This mixture pulp / water before reaching the middle of the dispersion generally contains from 70 to 99% by weight of water and 1 to 30% by weight of cellulose.
  • the polyester filaments are generally cut and generally have a length ranging from 3 to 25 mm and have a diameter ranging from 7 to 20 ⁇ m. As polyester filaments which can be used, mention may be made of those sold under the reference EP133 by the company Kuraray.
  • a mixture of glass filaments / cellulose fibers is used more particularly when good tear resistance is sought.
  • a mixture of glass filaments / polyester filaments is more particularly used when good tear resistance and an improvement in the appearance of the haze are sought. Indeed, the polyester filaments give a more regular appearance to the veil.
  • the PVOH fibers are discontinuous and generally have a length ranging from 3 to 15 mm and a diameter ranging from 7 to 20 ⁇ m.
  • the cut filaments and the PVOH fibers are dispersed in water, for example in a pulper.
  • the aqueous solution in which the cut filaments and PVOH fibers are dispersed is called process water.
  • This dispersion can be carried out initially in a pulper for example with a proportion of filaments and fibers such that the sum of the mass of filaments + fibers ranges from 0.01% to 0.5% by weight of the sum the weight of the filaments, fibers and process water.
  • the filament / fiber / process water mixture at the time of passing into the bed forming stage is such that the sum of the mass of filaments + fibers represents 0.01 to 0.5% by weight of said mixture and preferably 0.02 to 0.05% of said mixture.
  • the mixture may undergo a decrease in the concentration of filaments + fibers when passing from the pulper to the device for forming the bed.
  • an amount of PVOH fibers is used representing 1.5 to 20% by weight and more preferably 2.5 to 15% by weight of the sum of the mass of cut filaments and PVOH fibers.
  • cut filaments only glass filaments can be used.
  • cut filaments it is also possible to use a mixture of glass filaments and cellulose fibers, in particular in the following glass / cellulose mass ratio: from 99/1 to 80/20, and preferably from 95/5 to 90 / 10, it being understood that the mass of glass filaments takes into account its possible size.
  • the process water may include a thickener to increase the viscosity of the process water.
  • This thickener can be present in an amount of 0 to 0.5% by weight in the process water.
  • This thickener can for example be a hydroxyethylcellulose (for example Natrosol 250HHR from Hercules).
  • the process water may include a cationic dispersant.
  • This cationic dispersant can be present in an amount of 0 to 0.1% by weight in the process water.
  • This cationic dispersant can be, for example, guanidine or a fatty chain amine.
  • the thickener is preferably introduced so that the process water has a viscosity of between 1 and 20 mPa.s at 20 ° C. and preferably between 5 and 12 mPa.s.
  • process water / cut filaments is agitated, then sent to a permeable forming fabric (which can also be called a mat) letting the process water flow through it and retaining the cut filaments and the PVOH fibers at its area.
  • Process water can be aspirated to improve its evacuation.
  • Process water can be recycled to be mixed again with cut filaments and PVOH fibers.
  • the forming fabric is a moving carpet, that is to say in movement, and conveying the bed in the direction of the steaming device.
  • the final veil generally comprises 1.5 to 15% by weight of binder (which can be exclusively PVOH), and more generally 2.5 to 10% by weight of binder (which can be exclusively PVOH), the rest of the mass of the veil being generally constituted by the mass of the filaments which includes any sizing products which cover them.
  • the veil according to the invention is generally based on glass filaments, that is to say it generally comprises at least 55% by weight of glass in the form of filaments.
  • the veil may comprise at least 80% by weight of glass in the form of filaments, and this in particular when only glass filaments have been used as cut filaments. If the final veil comprises both glass filaments and cellulose fibers, these two types of components remain present in the final veil in the proportions of their introduction and which has already been said.
  • the final veil comprises both glass filaments and polyester filaments, these two types of components remain present in the final veil in the proportions of their introduction and which has already been said. If one chooses to apply part of the total binder in the device for applying a binder, this is generally applied in the form of an aqueous dispersion
  • the binder can be of the type usually used in this kind of embodiment.
  • it may be plasticized polyvinyl acetate (PVAc) or acrylic styrene or self-crosslinkable acrylic or urea formaldehyde or melamine formaldehyde.
  • PVAc plasticized polyvinyl acetate
  • acrylic styrene acrylic styrene or self-crosslinkable acrylic or urea formaldehyde or melamine formaldehyde.
  • the excess binder can be removed by suction through the forming fabric.
  • the bed must enter wet (between 20 and 70% by weight of water, for example about 40% by weight of water) into the steaming device in order to allow the polyvinyl alcohol fiber to dissolve in the water .
  • This dissolution occurs under the effect of temperature, generally from around 60 ° C.
  • the PVOH fiber is thus transformed into binder droplets.
  • the purpose of the heat treatment step is to evaporate the water as well as to carry out any chemical reactions between the various constituents such as, for example, condensations of -OH groups.
  • the heat treatment can be carried out by heating between 140 and 250 ° C.
  • the duration of the heat treatment generally ranges from 2 seconds to 3 minutes.
  • the veil can be dried and heat treated in a hot air oven circulating through the carpet.
  • At the end of the heat treatment essentially all the PVOH fibers are transformed into a PVOH binder and no longer appear in the form of fibers.
  • FIG. 1 schematically represents a process for the continuous preparation of a veil according to the invention.
  • the cut filaments and the PVOH fiber are dispersed in a pulper 1 in the presence of process water and with stirring.
  • the mixture then optionally pours into a storage tank 2 through the pipe 3, the function of the storage tank being to increase the duration of mixing between the filaments and the process water.
  • This storage bin is optional.
  • the mixture is then brought through line 4 to line 5, which combines the flow of mixture from line 4 with a flow of recycled process water from the headbox 6 through line 7.
  • A At this level, the content of filaments and fibers in the filament / fiber / process water mixture is greatly reduced.
  • Process water is drained at 14 and possibly sucked at 15 through the forming fabric 8 and is recycled via the pipe 17.
  • This recycled water is then shared at 16, for example for around 10% for return to the pulper through line 10 and for approximately 90% to return to the headbox 6 through lines 9, 7 then 5. Circulation in the lines is ensured by pumps 11, 12 and 13.
  • the pump 11 is called the main pump ("fan pump" in English).
  • the veil in formation 18 then makes a "carpet jump" towards the steaming device 19, and the final veil is wound at 20.
  • the invention leads to a web having a very high level of tensile strength for low levels of binders, in particular such that the following relationship is verified:
  • R ⁇ the tensile strength in daN for 5 cm
  • L the rate of binder in the web in% by weight
  • G the grammage of the web in g / m 2 .
  • the tensile strengths of the veil according to the invention are twice that of a conventional veil bound by a formalin urea of very good characteristic (see in particular the examples).
  • the veil according to the invention is more particularly intended for wall coverings.
  • the veil according to the invention is therefore generally such that it does not contain PVC.
  • the tensile strength was measured by the standard
  • Glass strands cut to a length of 18 mm are used, said strands containing filaments with a diameter of 13 ⁇ m, said strands being coated with a size comprising an organosilane and having a moisture content of 13% by weight.
  • These wires are used in the process of FIG. 1.
  • the glass wires cut are introduced into the pulper so that their concentration therein is 1.95 (example 1), 1, 9 (example 2) , 1, 8 (example 3) grams per liter.
  • fibers cut to 4 mm of PVOH are introduced into the pulper so that their concentration is respectively 0.05 (example 1), 0.1 (example 2), and 0.2 (example 3) grams per liter.
  • the concentration of glass strands is then diluted by 10 and the concentration of filaments + fibers on arrival on the forming fabric was 0.2 g / l.
  • the concentration of PVOH fibers on arrival on the forming fabric was 0.005, 0.01 and 0.02 g / l, respectively.
  • the forming fabric was traveling at a speed of 80 m / min, the flow rate of glass fiber-PVOH fiber-process water mixture pouring onto the fabric being 35 m 3 / hour.
  • the process water contained 0.1% by weight of hydroxyethyl cellulose (Natrosol 250HHR from Hercules) and 0.025% by weight of cationic dispersant (aerosol C61 from Cytec). After drainage and suction of excess water, the wet sheet contains 35% water. The sheet is then dried in a hot air oven at 180 ° C for 20 seconds. The veil obtained is very homogeneous and has a surface mass of 50 g / m 2 . It contains the quantities of PVOH indicated in Table 1. Table 1 collates the results.
  • Example 1 The procedure is as for Example 1 except that no PVOH fiber is placed in the pulper, and except that a binder is added after the forming fabric and before drying by pouring out a cascade of a PVOH or urea formaldehyde solution on the moving web.
  • the veils obtained all have a surface mass of 50 g / m 2 .
  • Table 1 collates the results.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Nonwoven Fabrics (AREA)
  • Paper (AREA)
  • Reinforced Plastic Materials (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)

Abstract

Continuous production of a fabric comprising glass fiber filaments bonded with a binder comprising polyvinyl alcohol (PVOH) involves dispersing cut glass filaments and discontinuous PVOH fibers in a process liquid, forming a bed by passing the dispersion onto a forming fabric through which the process liquid drains and thermally treating the bed on a conveyer belt in a stoving equipment. An Independent claim is included for the fabric produced using the method.

Description

VOILE A LIANT FIBRE PVOH PVOH FIBER BINDER
L'invention concerne un procédé de fabrication d'un voile de fibre dont le liant est issu de fibres d'alcool polyvinylique (PVOH). Le voile fabriqué selon l'invention peut notamment peut être utilisé comme revêtement de surface (« wall covering »). Pour cette application, il peut être collé aux murs par une face à l'aide d'une colle à l'eau et recevoir une peinture (à l'eau ou en solvant organique) sur l'autre face. On entend par voile (« veil » en anglais) un non-tissé constitué de filaments complètement dispersés. Généralement, un voile présente une masse surfacique allant de 10 à 60 g/m2 et plus particulièrement 20 à 40 g/m2, par exemple environ 30 g/m2.The invention relates to a process for manufacturing a fiber veil, the binder of which is derived from polyvinyl alcohol (PVOH) fibers. The veil produced according to the invention can in particular be used as a surface covering (“wall covering”). For this application, it can be glued to walls on one side using a water-based glue and receive a paint (with water or organic solvent) on the other side. By veil is meant a veil made of completely dispersed filaments. Generally, a veil has a surface mass ranging from 10 to 60 g / m 2 and more particularly 20 to 40 g / m 2 , for example around 30 g / m 2 .
La fabrication d'un voile en continu implique le passage d'un lit de filaments dispersés par un ensemble de plusieurs dispositifs successifs devant chacun appliquer auxdits filaments un traitement particulier. Le lit de fibres, après sa formation dans un « dispositif de formation », traverse ensuite un « dispositif de dépose de liant » puis un « dispositif d'étuvage ». Le transport du lit au travers de ces dispositifs est réalisé grâce à des tapis défilants, et le lit est généralement amené à passer d'un tapis à l'autre. Pour ce passage d'un dispositif à l'autre par des « sauts de tapis », le voile en formation a tendance à perdre de sa cohésion, ce qui se traduit par des défauts de structure du voile final comme un grammage irrégulier.The manufacture of a continuous veil involves the passage of a bed of dispersed filaments by a set of several successive devices each having to apply a specific treatment to said filaments. The fiber bed, after its formation in a "formation device", then passes through a "binder depositing device" then a "steaming device". The transport of the bed through these devices is carried out using scrolling belts, and the bed is generally caused to pass from one carpet to another. For this passage from one device to another by “jumps of carpet”, the veil in formation tends to lose its cohesion, which results in structural defects of the final veil such as an irregular grammage.
Le procédé en continu selon l'invention comprend : -une étape de mise en dispersion dans une eau de procédé de filaments coupés et de fibres discontinues de PVOH, puis, -une étape de formation d'un lit dans un dispositif de formation par passage de la dispersion sur une toile de formation à travers laquelle l'eau de procédé est drainée, les filaments et les fibres étant retenus sur ladite toile, puis,The continuous process according to the invention comprises: a step of dispersing cut filaments and staple fibers of PVOH in process water, then a step of forming a bed in a formation device by passage dispersion on a forming fabric through which the process water is drained, the filaments and fibers being retained on said fabric, then,
-une étape de traitement thermique dans un dispositif d'étuvage. L'invention remédie aux problèmes sus-mentionnés. En effet, comme la fibre de PVOH mise au départ joue le rôle de liant du voile, il n'est pas forcément nécessaire d'utiliser un dispositif d'application d'un liant, ce qui implique que le voile a moins de « sauts de tapis » à réaliser. D'autre part, la demanderesse a découvert que les fibres de PVOH donnaient de la solidité au lit en formation, probablement du fait que la fibre PVOH donne du collant aux différents ingrédients du lit et les maintient. De ce fait le lit est moins endommagé lors des sauts de tapis.-a heat treatment step in a steaming device. The invention overcomes the above-mentioned problems. In fact, since the PVOH fiber used at the outset acts as a binder for the web, it is not necessarily necessary to use a device for applying a binder, which implies that the sailing has fewer “carpet jumps” to perform. On the other hand, the Applicant has discovered that the PVOH fibers give solidity to the bed in formation, probably because the PVOH fiber gives tackiness to the various bed ingredients and maintains them. As a result, the bed is less damaged when the carpet is thrown.
Pour être mis en dispersion dans l'eau, les filaments doivent pouvoir rester à l'état individuel et ne pas se regrouper mélangés dans l'eau de procédé. Si l'on disperse dans l'eau des fils coupés, ensemble de filaments, ces fils doivent pouvoir se défilamentiser en dispersion dans l'eau. On entend par « fil » un ensemble de filaments contigus et comprenant plus particulièrement de 10 à 2000 filaments. Ainsi, les filaments, plus particulièrement ceux en verre, peuvent être introduits dans l'eau de procédé sous la forme de fils comprenant plus particulièrement 10 à 2000 filaments.To be dispersed in water, the filaments must be able to remain in the individual state and not to combine mixed in the process water. If chopped strands, a set of filaments, are dispersed in water, these strands must be able to defilamentize in dispersion in water. “Yarn” is understood to mean a set of contiguous filaments and more particularly comprising from 10 to 2000 filaments. Thus, the filaments, more particularly those made of glass, can be introduced into the process water in the form of wires comprising more particularly 10 to 2000 filaments.
Les filaments utilisables dans le cadre de la présente invention comprennent généralement des filaments de verre et sont plus particulièrement des filaments de verre, pouvant être mis en oeuvre lors de la dispersion sous forme de fils coupés. Les filaments peuvent avoir été ensimés lors de leur fabrication, pour être rassemblés le cas échéant sous forme de fils, notamment par des liquides d'ensimage comprenant un organosilane et / ou un agent collant (« film former » en anglais ). Il est préférable dans ce cas de ne pas sécher les filaments avant de les mettre en dispersion dans l'eau, de façon à éviter de coller les filaments entre eux, ce qui gênerait leur dispersion à l'état de filaments individuels.The filaments which can be used in the context of the present invention generally comprise glass filaments and are more particularly glass filaments, which can be used during dispersion in the form of chopped strands. The filaments may have been sized during their manufacture, to be collected if necessary in the form of threads, in particular by sizing liquids comprising an organosilane and / or a tackifier ("film former" in English). In this case, it is preferable not to dry the filaments before dispersing them in water, so as to avoid sticking the filaments together, which would hinder their dispersion in the form of individual filaments.
En tant que filaments coupés, en plus des filaments de verre, on peut également utiliser des fibres de cellulose (ou « filaments de cellulose » en tant que synonyme) et/ou des filaments en polyester, notamment en polyéthylène téréphtalate (PET).As cut filaments, in addition to glass filaments, it is also possible to use cellulose fibers (or “cellulose filaments” as a synonym) and / or polyester filaments, in particular polyethylene terephthalate (PET).
Les fibres de cellulose sont généralement obtenues à partir de pulpe de bois. Cette pulpe de bois est généralement obtenues à partir de feuilles commerciales en carton que l'on ramollit avec de l'eau. Cette eau utilisée pour ramollire le carton sert ensuite au transport de la pulpe en direction de l'installation de réalisation de la dispersion. Ce mélange eau / pulpe contient généralement juste l'eau suffisante pour pouvoir véhiculer la pulpe par écoulement. Ce mélange pulpe / eau avant d'atteindre le milieu de la dispersion contient généralement de 70 à 99 % en poids d'eau et 1 à 30% en poids de cellulose.Les filaments de polyester sont généralement coupés et ont généralement une longueur allant de 3 à 25 mm et ont un diamètre allant de 7 à 20 μm. Comme filaments de polyester utilisables, on peut citer ceux commercialisés sous la référence EP133 par la société Kuraray.Cellulose fibers are generally obtained from wood pulp. This wood pulp is generally obtained from commercial sheets of cardboard which are softened with water. This water used to soften the cardboard is then used to transport the pulp to the installation for producing the dispersion. This water / pulp mixture generally contains just enough water to be able to transport the pulp by flow. This mixture pulp / water before reaching the middle of the dispersion generally contains from 70 to 99% by weight of water and 1 to 30% by weight of cellulose. The polyester filaments are generally cut and generally have a length ranging from 3 to 25 mm and have a diameter ranging from 7 to 20 μm. As polyester filaments which can be used, mention may be made of those sold under the reference EP133 by the company Kuraray.
Comme filaments coupés dans le cadre de la présente invention, on utilise plus particulièrement un mélange filaments de verre / fibres de cellulose lorsque l'on recherche une bonne résistance à la déchirure. Comme filaments coupés dans le cadre de la présente invention, on utilise plus particulièrement un mélange filaments de verre / filaments de polyester lorsque l'on recherche une bonne résistance à la déchire et une amélioration de l'aspect du voile. En effet, les filaments de polyester confèrent un aspect plus régulier au voile. Les fibres de PVOH sont discontinues et ont généralement une longueur allant de 3 à 15 mm et un diamètre allant de 7 à 20 μm.As cut filaments in the context of the present invention, a mixture of glass filaments / cellulose fibers is used more particularly when good tear resistance is sought. As filaments cut in the context of the present invention, a mixture of glass filaments / polyester filaments is more particularly used when good tear resistance and an improvement in the appearance of the haze are sought. Indeed, the polyester filaments give a more regular appearance to the veil. The PVOH fibers are discontinuous and generally have a length ranging from 3 to 15 mm and a diameter ranging from 7 to 20 μm.
Pour la première étape, les filaments coupés et les fibres de PVOH sont mis en dispersion dans l'eau, par exemple dans un pulpeur. La solution aqueuse dans laquelle les filaments coupés et les fibres de PVOH sont dispersés est appelée eau de procédé. Cette mise en dispersion peut être réalisée dans un premier temps dans un pulpeur par exemple avec une proportion de filaments et de fibres telle que la somme de la masse filaments + fibres aille de 0,01% à 0,5% en poids de la somme du poids des filaments, des fibres et de l'eau de procédé.For the first step, the cut filaments and the PVOH fibers are dispersed in water, for example in a pulper. The aqueous solution in which the cut filaments and PVOH fibers are dispersed is called process water. This dispersion can be carried out initially in a pulper for example with a proportion of filaments and fibers such that the sum of the mass of filaments + fibers ranges from 0.01% to 0.5% by weight of the sum the weight of the filaments, fibers and process water.
De préférence, le mélange filaments/fibres/eau de procédé au moment de passer dans l'étape de formation du lit est tel que la somme de la masse filaments + fibres représente 0,01 à 0,5% en poids dudit mélange et de préférence 0,02 à 0,05% dudit mélange. Le mélange peut subir une diminution de concentration en filaments + fibres en passant du pulpeur au dispositif de formation du lit.Preferably, the filament / fiber / process water mixture at the time of passing into the bed forming stage is such that the sum of the mass of filaments + fibers represents 0.01 to 0.5% by weight of said mixture and preferably 0.02 to 0.05% of said mixture. The mixture may undergo a decrease in the concentration of filaments + fibers when passing from the pulper to the device for forming the bed.
On utilise de préférence une quantité de fibres de PVOH représentant 1 ,5 à 20 % en poids et de manière encore préférée 2,5 à 15 % en poids de la somme de la masse de filaments coupés et de fibres de PVOH.Preferably, an amount of PVOH fibers is used representing 1.5 to 20% by weight and more preferably 2.5 to 15% by weight of the sum of the mass of cut filaments and PVOH fibers.
En tant que filaments coupés, on peut n'utiliser que des filaments de verre. En tant que filaments coupés, on peut également utiliser un mélange de filaments de verre et de fibres de cellulose, notamment dans le rapport massique verre / cellulose suivant : de 99/1 à 80/20, et de préférence de 95/5 à 90/10, étant entendu que la masse de filaments de verre prend en compte son éventuel ensimage.As cut filaments, only glass filaments can be used. As cut filaments, it is also possible to use a mixture of glass filaments and cellulose fibers, in particular in the following glass / cellulose mass ratio: from 99/1 to 80/20, and preferably from 95/5 to 90 / 10, it being understood that the mass of glass filaments takes into account its possible size.
En tant que filaments coupés, on peut également utiliser un mélange de filaments de verre et de filaments de polyester, notamment dans le rapport massique verre / polyester suivant : de 99/1 à 70/30, et de préférence de 90/10 à 80/20. L'eau de procédé peut comprendre un épaississant pour faire augmenter la viscosité de l'eau de procédé. Cet épaississant peut être présent à raison de 0 à 0,5% en poids dans l'eau de procédé. Cet épaississant peut par exemple être une hydroxyéthylcellulose (par exemple Natrosol 250HHR de Hercules).As cut filaments, it is also possible to use a mixture of glass filaments and polyester filaments, in particular in the following glass / polyester mass ratio: from 99/1 to 70/30, and preferably from 90/10 to 80 / 20. The process water may include a thickener to increase the viscosity of the process water. This thickener can be present in an amount of 0 to 0.5% by weight in the process water. This thickener can for example be a hydroxyethylcellulose (for example Natrosol 250HHR from Hercules).
L'eau de procédé peut comprendre un dispersant cationique. Ce dispersant cationique peut être présent à raison de 0 à 0,1% en poids dans l'eau de procédé. Ce dispersant cationique peut être par exemple la guanidine ou une aminé à chaîne grasse. On peut notamment utiliser l'aérosol C 61 commercialisé parThe process water may include a cationic dispersant. This cationic dispersant can be present in an amount of 0 to 0.1% by weight in the process water. This cationic dispersant can be, for example, guanidine or a fatty chain amine. One can in particular use the aerosol C 61 marketed by
CYTEC.CYTEC.
On introduit de préférence l'épaississant de façon à ce que l'eau de procédé présente à 20°C une viscosité comprise entre 1 et 20 mPa.s et de préférence comprise entre 5 et 12 mPa.s.The thickener is preferably introduced so that the process water has a viscosity of between 1 and 20 mPa.s at 20 ° C. and preferably between 5 and 12 mPa.s.
La dispersion eau de procédé/filaments coupés est agitée, puis envoyée sur une toile de formation perméable (pouvant également être appelée tapis) laissant s'écouler l'eau de procédé à travers elle et retenant les filaments coupés et les fibres de PVOH à sa surface. L'eau de procédé peut être aspirée pour améliorer son évacuation. L'eau de procédé peut être recyclée pour être de nouveau mélangée avec des filaments coupés et des fibres PVOH. Les filaments coupés et les fibres PVOH, mélangés, forment ainsi un lit en surface de la toile de formation.The dispersion of process water / cut filaments is agitated, then sent to a permeable forming fabric (which can also be called a mat) letting the process water flow through it and retaining the cut filaments and the PVOH fibers at its area. Process water can be aspirated to improve its evacuation. Process water can be recycled to be mixed again with cut filaments and PVOH fibers. The cut filaments and the PVOH fibers, mixed, thus form a bed on the surface of the forming fabric.
La toile de formation est un tapis défilant, c'est-à-dire en mouvement, et convoyant le lit en direction du dispositif d'étuvage.The forming fabric is a moving carpet, that is to say in movement, and conveying the bed in the direction of the steaming device.
Il n'est pas nécessaire de faire passer le lit formé par un dispositif d'application d'un liant, dans la mesure ou la fibre de PVOH utilisée au départ a la fonction de constituer le liant du voile final. Cependant, il n'est pas exclu d'utiliser un plus faible taux de liant sous la forme de fibres introduites au départ, et de compléter par ajout de liant dans un dispositif d'application de liant placé après le dispositif de formation du lit. On peut donc apporter sous forme de fibres PVOH introduites au départ 25 à 100% du poids total de liant, le reste étant appliqué dans le dispositif d'application du liant.It is not necessary to pass the bed formed by a device for applying a binder, since the PVOH fiber used at the start has the function of constituting the binder of the final veil. However, it is not excluded to use a lower level of binder in the form of fibers introduced at the start, and to complete by adding binder in a binder application device placed after the bed-forming device. It is therefore possible to supply PVOH fibers introduced at the start with 25 to 100% of the total weight of binder, the rest being applied in the device for applying the binder.
Le voile final comprend généralement 1 ,5 à 15% en poids de liant (pouvant être exclusivement du PVOH), et plus généralement 2,5 à 10% en poids de liant (pouvant être exclusivement du PVOH), le reste de la masse du voile étant généralement constitué par la masse des filaments ce qui inclut les éventuels produits d'ensimage qui les recouvrent. Le voile selon l'invention est généralement à base de filaments de verre, c'est-à-dire qu'il comprend généralement au moins 55 % en poids de verre sous la forme de filaments. Ainsi, le voile peut comprendre au moins 80% en poids de verre sous forme de filaments, et ce notamment lorsque seuls des filaments de verre ont été utilisés en tant que filaments coupés. Si le voile final comprend à la fois des filaments de verre et des fibres de cellulose, ces deux types de composants restent présents dans le voile final dans les proportions de leur introduction et qui a déjà été dite.The final veil generally comprises 1.5 to 15% by weight of binder (which can be exclusively PVOH), and more generally 2.5 to 10% by weight of binder (which can be exclusively PVOH), the rest of the mass of the veil being generally constituted by the mass of the filaments which includes any sizing products which cover them. The veil according to the invention is generally based on glass filaments, that is to say it generally comprises at least 55% by weight of glass in the form of filaments. Thus, the veil may comprise at least 80% by weight of glass in the form of filaments, and this in particular when only glass filaments have been used as cut filaments. If the final veil comprises both glass filaments and cellulose fibers, these two types of components remain present in the final veil in the proportions of their introduction and which has already been said.
Si le voile final comprend à la fois des filaments de verre et des filaments de polyester, ces deux types de composants restent présents dans le voile final dans les proportions de leur introduction et qui a déjà été dite. Si l'on choisit d'appliquer une partie du liant total dans le dispositif d'application d'un liant, on applique généralement celui-ci sous la forme d'une dispersion aqueuseIf the final veil comprises both glass filaments and polyester filaments, these two types of components remain present in the final veil in the proportions of their introduction and which has already been said. If one chooses to apply part of the total binder in the device for applying a binder, this is generally applied in the form of an aqueous dispersion
- soit par trempage entre deux toiles de formation auquel cas le produit maintenu entre les deux toiles est plongé dans un bain par l'intermédiaire de paires de rouleaux,- either by soaking between two forming fabrics in which case the product held between the two fabrics is immersed in a bath by means of pairs of rollers,
- soit par dépôt sur le lit de filaments coupés, par une cascade, ce qui signifie que la dispersion aqueuse de liant est coulée sur la nappe de filaments coupés selon un filet perpendiculaire à ladite nappe et perpendiculaire au sens de défilement de ladite nappe. Le liant peut être du type de ceux habituellement utilisés dans ce genre de réalisation. Notamment il peut s'agir d'acétate de polyvinyle (PVAc) plastifié ou styrène acrylique ou acrylique auto-réticulable ou urée formol ou mélamine formol. L'excès de liant peut être évacué par aspiration à travers la toile de formation. Le lit doit entrer humide (entre 20 et 70% en poids d'eau, par exemple environ 40% en poids d'eau) dans le dispositif d'étuvage afin de permettre la dissolution de la fibre d'alcool polyvinylique dans l'eau. Cette dissolution se produit sous l'effet de la température, généralement à partir d'environ 60°C. La fibre de PVOH se transforme ainsi en gouttelettes de liant.- Or by depositing on the bed of cut filaments, by a cascade, which means that the aqueous dispersion of binder is poured onto the sheet of cut filaments according to a thread perpendicular to said sheet and perpendicular to the direction of travel of said sheet. The binder can be of the type usually used in this kind of embodiment. In particular, it may be plasticized polyvinyl acetate (PVAc) or acrylic styrene or self-crosslinkable acrylic or urea formaldehyde or melamine formaldehyde. The excess binder can be removed by suction through the forming fabric. The bed must enter wet (between 20 and 70% by weight of water, for example about 40% by weight of water) into the steaming device in order to allow the polyvinyl alcohol fiber to dissolve in the water . This dissolution occurs under the effect of temperature, generally from around 60 ° C. The PVOH fiber is thus transformed into binder droplets.
L'étape de traitement thermique à pour but d'évaporer l'eau ainsi que réaliser les éventuelles réactions chimiques entre les différents constituants comme par exemple les condensations de groupements -OH. Le traitement thermique peut être réalisé par chauffage entre 140 et 250°C. La durée du traitement thermique va généralement de 2 secondes à 3 minutes. Le voile peut être séché et traité thermiquement en étuve à air chaud à circulation au travers du tapis. A l'issu du traitement thermique, essentiellement toutes les fibres de PVOH se sont transformées en liant PVOH et n'apparaissent plus sous la forme de fibres. La figure 1 représente schématiquement un procédé de préparation en continu d'un voile selon l'invention. Les filaments coupés et la fibre de PVOH sont mis en dispersion dans un pulpeur 1 en présence d'eau de procédé et sous agitation. Le mélange se déverse ensuite éventuellement dans un bac de stockage 2 à travers la canalisation 3, la fonction du bac de stockage étant de d'augmenter la durée de mélange entre les filaments et l'eau de procédé. Ce bac de stockage est facultatif. Le mélange est ensuite amené à travers la canalisation 4 à la canalisation 5, laquelle rassemble le flux de mélange provenant de la canalisation 4 à un flux d'eau de procédé recyclé et provenant de la caisse de tête 6 à travers la canalisation 7. A ce niveau, la teneur en filaments et fibres dans le mélange filaments/fibres/eau de procédé est fortement abaissée. De l'eau de procédé est drainée en 14 et éventuellement aspirée en 15 à travers la toile de formation 8 et est recyclée par l'intermédiaire de la canalisation 17. Cette eau recyclée est ensuite partagée en 16, par exemple pour environ 10% pour retourner vers le pulpeur à travers la canalisation 10 et pour environ 90% pour retourner vers la caisse de tête 6 à travers les canalisations 9, 7 puis 5. La circulation dans les canalisations est assurée par les pompes 11 , 12 et 13. La pompe 11 est appelée pompe principale (« fan pump » en anglais). Le voile en formation 18 fait ensuite un « saut de tapis » vers le dispositif d'étuvage 19, et le voile final est enroulé en 20.The purpose of the heat treatment step is to evaporate the water as well as to carry out any chemical reactions between the various constituents such as, for example, condensations of -OH groups. The heat treatment can be carried out by heating between 140 and 250 ° C. The duration of the heat treatment generally ranges from 2 seconds to 3 minutes. The veil can be dried and heat treated in a hot air oven circulating through the carpet. At the end of the heat treatment, essentially all the PVOH fibers are transformed into a PVOH binder and no longer appear in the form of fibers. FIG. 1 schematically represents a process for the continuous preparation of a veil according to the invention. The cut filaments and the PVOH fiber are dispersed in a pulper 1 in the presence of process water and with stirring. The mixture then optionally pours into a storage tank 2 through the pipe 3, the function of the storage tank being to increase the duration of mixing between the filaments and the process water. This storage bin is optional. The mixture is then brought through line 4 to line 5, which combines the flow of mixture from line 4 with a flow of recycled process water from the headbox 6 through line 7. A At this level, the content of filaments and fibers in the filament / fiber / process water mixture is greatly reduced. Process water is drained at 14 and possibly sucked at 15 through the forming fabric 8 and is recycled via the pipe 17. This recycled water is then shared at 16, for example for around 10% for return to the pulper through line 10 and for approximately 90% to return to the headbox 6 through lines 9, 7 then 5. Circulation in the lines is ensured by pumps 11, 12 and 13. The pump 11 is called the main pump ("fan pump" in English). The veil in formation 18 then makes a "carpet jump" towards the steaming device 19, and the final veil is wound at 20.
L'invention mène à un voile présentant un niveau de résistance à la traction très élevé pour de faibles taux de liants, notamment tel que la relation suivante est vérifiée :The invention leads to a web having a very high level of tensile strength for low levels of binders, in particular such that the following relationship is verified:
Rτ / (L . G) > 0,03, voire même > 0,035 , dans laquelle Rτ représente la résistance à la traction en daN pour 5 cm, L représente le taux de liant dans le voile en % en poids, et G représente le grammage du voile en g/m2. Pour la détermination de Rγ, on prend la moyenne des deux valeurs obtenus, pour le sens travers (« cross direction » en anglais) d'une part ,et pour le sens long (« machine direction » en anglais) d'autre part.R τ / (L. G)> 0.03, or even> 0.035, in which R τ represents the tensile strength in daN for 5 cm, L represents the rate of binder in the web in% by weight, and G represents the grammage of the web in g / m 2 . For the determination of Rγ, we take the average of the two values obtained, for the cross direction (“cross direction” in English) on the one hand, and for the long direction (“machine direction” in English) on the other hand.
A titre de comparaison, et à taux de liant identique, les résistances à la traction du voile selon l'invention sont le double de celles conférées à un voile classique lié par une urée formol de très bonne caractéristique (voir notamment les exemples).By way of comparison, and with an identical binder content, the tensile strengths of the veil according to the invention are twice that of a conventional veil bound by a formalin urea of very good characteristic (see in particular the examples).
Le voile selon l'invention est plus particulièrement destiné aux revêtements de murs. Pour ce type d'application, on ne souhaite pas qu'il contienne de résine du type PVC. Le voile selon l'invention est donc généralement tel qu'il ne contient pas de PVC. Dans les exemples, la résistance à la traction a été mesurée par la normeThe veil according to the invention is more particularly intended for wall coverings. For this type of application, we do not want it to contain PVC type resin. The veil according to the invention is therefore generally such that it does not contain PVC. In the examples, the tensile strength was measured by the standard
ISO 3342. ISO 3342.
Exemple 1 à 3:Example 1 to 3:
On utilise des fils de verre coupés à une longueur de 18 mm, lesdits fils contenant des filaments de diamètre 13μm, lesdits filaments étant revêtu par un ensimage comprenant un organosilane et présentant un taux d'humidité de 13% en poids. Ces fils sont mis en œuvre dans le procédé de la figure 1. On introduit les fils de verre coupés dans le pulpeur de façon à ce que leur concentration y soit respectivement de 1 ,95 (exemple 1 ), 1 ,9 (exemple 2), 1 ,8 (exemple 3) grammes par litre. On introduit par ailleurs dans le pulpeur des fibres coupés à 4 mm de PVOH (de marque Kuralon 105-2 commercialisé par la société Kuraray) de façon à ce que leur concentration y soit respectivement de 0,05 (exemple 1), 0,1 (exemple 2), et 0,2 (exemple 3) grammes par litre. La concentration en fils de verre est ensuite diluée par 10 et la concentration en filaments + fibres à l'arrivée sur la toile de formation était de 0,2 g/l. La concentration en fibres de PVOH à l'arrivée sur la toile de formation était respectivement de 0,005, 0,01 et 0,02 g/l. La toile de formation défilait avec une vitesse de 80 m/min, le débit de mélange fils de verre-fibres PVOH-eau de procédé se déversant sur la toile étant de 35 m3/heure. L'eau de procédé contenait 0,1% en poids d'hydroxyéthyle cellulose (Natrosol 250HHR de Hercules) et 0,025 % en poids de dispersant cationique (aérosol C61 de Cytec). Après drainage et aspiration de l'eau excédentaire, la nappe humide contient 35% d'eau. La nappe est ensuite séchée par étuve à air chaud à 180°C pendant 20 secondes. Le voile obtenu est très homogène et présente une masse surfacique de 50g/m2. Il contient les quantités de PVOH indiquées sur le tableau 1. Le tableau 1 rassemble les résultats.Glass strands cut to a length of 18 mm are used, said strands containing filaments with a diameter of 13 μm, said strands being coated with a size comprising an organosilane and having a moisture content of 13% by weight. These wires are used in the process of FIG. 1. The glass wires cut are introduced into the pulper so that their concentration therein is 1.95 (example 1), 1, 9 (example 2) , 1, 8 (example 3) grams per liter. In addition, fibers cut to 4 mm of PVOH (of Kuralon 105-2 brand sold by the company Kuraray) are introduced into the pulper so that their concentration is respectively 0.05 (example 1), 0.1 (example 2), and 0.2 (example 3) grams per liter. The concentration of glass strands is then diluted by 10 and the concentration of filaments + fibers on arrival on the forming fabric was 0.2 g / l. The concentration of PVOH fibers on arrival on the forming fabric was 0.005, 0.01 and 0.02 g / l, respectively. The forming fabric was traveling at a speed of 80 m / min, the flow rate of glass fiber-PVOH fiber-process water mixture pouring onto the fabric being 35 m 3 / hour. The process water contained 0.1% by weight of hydroxyethyl cellulose (Natrosol 250HHR from Hercules) and 0.025% by weight of cationic dispersant (aerosol C61 from Cytec). After drainage and suction of excess water, the wet sheet contains 35% water. The sheet is then dried in a hot air oven at 180 ° C for 20 seconds. The veil obtained is very homogeneous and has a surface mass of 50 g / m 2 . It contains the quantities of PVOH indicated in Table 1. Table 1 collates the results.
Exemples 4 à 9 (comparatifs) :Examples 4 to 9 (comparative):
On procède comme pour l'exemple 1 sauf que l'on ne met pas de fibre de PVOH dans le pulpeur, et sauf que l'on ajoute un liant après la toile de formation et avant séchage par déversement d'une cascade d'une solution de PVOH ou d'urée formol sur la nappe défilante. Les voile obtenus présentent tous une masse surfacique de 50g/m2. Le tableau 1 rassemble les résultats. The procedure is as for Example 1 except that no PVOH fiber is placed in the pulper, and except that a binder is added after the forming fabric and before drying by pouring out a cascade of a PVOH or urea formaldehyde solution on the moving web. The veils obtained all have a surface mass of 50 g / m 2 . Table 1 collates the results.
Tableau 1 Table 1

Claims

REVENDICATIONS
1. Procédé de fabrication en continu d'un voile comprenant des filaments de verre, ledit voile étant lié avec un liant comprenant du PVOH, comprenant : a. -une étape de formation d'une dispersion dans une eau de procédé de filaments coupés comprenant des filaments de verre, et de fibres discontinues de PVOH, puis, b. -une étape de formation d'un lit dans un dispositif de formation par passage de la dispersion sur une toile de formation à travers laquelle l'eau de procédé est drainée, ladite toile étant un tapis défilant, les filaments et les fibres étant retenus sur ladite toile, puis, c. -une étape de traitement thermique du lit sur un tapis défilant dans un dispositif d'étuvage.1. A method of continuously manufacturing a veil comprising glass filaments, said veil being bonded with a binder comprising PVOH, comprising: a. a step of forming a dispersion in a process water of cut filaments comprising glass filaments, and of staple fibers of PVOH, then, b. a step of forming a bed in a formation device by passing the dispersion over a forming fabric through which the process water is drained, said fabric being a moving belt, the filaments and fibers being retained on said canvas, then, c. -a step of heat treatment of the bed on a moving belt in a steaming device.
2. Procédé selon la revendication précédente, caractérisé en ce que le passage du dispositif de formation au dispositif d'étuvage fait réaliser au lit au moins un saut de tapis.2. Method according to the preceding claim, characterized in that the passage from the training device to the steaming device causes the bed to carry out at least one mat jump.
3. Procédé selon l'une des revendications précédentes caractérisé en ce que les filaments coupés en verre sont introduits dans l'eau de procédé sous la forme de fils comprenant 10 à 2000 filaments dispersables.3. Method according to one of the preceding claims characterized in that the glass cut filaments are introduced into the process water in the form of son comprising 10 to 2000 dispersible filaments.
4. Procédé selon l'une des revendications précédentes caractérisé en ce que la quantité de fibres de PVOH représente 1 ,5 à 20% en poids de la somme de la masse de filaments coupés et des fibres de PVOH.4. Method according to one of the preceding claims, characterized in that the quantity of PVOH fibers represents 1.5 to 20% by weight of the sum of the mass of cut filaments and PVOH fibers.
5. Procédé selon la revendication précédente caractérisé en ce que la quantité de fibres de PVOH représente 2,5 à 15% en poids de la somme de la masse de filaments coupés et des fibres de PVOH. 5. Method according to the preceding claim characterized in that the amount of PVOH fibers represents 2.5 to 15% by weight of the sum of the mass of cut filaments and PVOH fibers.
6. Procédé selon l'une des revendications précédentes caractérisé en ce que les fibres de PVOH ont une longueur allant de 3 à 15 mm.6. Method according to one of the preceding claims characterized in that the PVOH fibers have a length ranging from 3 to 15 mm.
7. Procédé selon l'une des revendications précédentes caractérisé en ce que la dispersion au moment de passer dans l'étape de formation du lit est tel que la somme de la masse filaments + fibres représente 0,01 à 0,5% de son poids.7. Method according to one of the preceding claims characterized in that the dispersion at the time of passing into the stage of formation of the bed is such that the sum of the mass of filaments + fibers represents 0.01 to 0.5% of its weight.
8. Procédé selon la revendication précédente caractérisé en ce que la dispersion au moment de passer dans l'étape de formation du lit est tel que la somme de la masse filaments + fibres représente 0,02 à 0,05% de son poids.8. Method according to the preceding claim characterized in that the dispersion at the time of passing into the stage of formation of the bed is such that the sum of the mass of filaments + fibers represents 0.02 to 0.05% of its weight.
9. Procédé selon l'une des revendications précédentes caractérisé en ce que l'eau de procédé comprend un épaississant de façon à ce que l'eau de procédé présente à 20°C une viscosité comprise entre 1 et 20 mPa.s.9. Method according to one of the preceding claims, characterized in that the process water comprises a thickener so that the process water has a viscosity between 1 and 20 mPa.s. at 20 ° C.
10. Procédé selon la revendication précédente caractérisé en ce que l'eau de procédé comprend un épaississant de façon à ce que l'eau de procédé présente à 20°C une viscosité comprise entre 5 et 12 mPa.s.10. Method according to the preceding claim characterized in that the process water comprises a thickener so that the process water has a viscosity of between 5 and 12 mPa.s at 20 ° C.
11. Procédé selon l'une des revendications précédentes caractérisé en ce que le voile comprend 1 ,5 à 15% en poids de liant.11. Method according to one of the preceding claims, characterized in that the veil comprises 1.5 to 15% by weight of binder.
12. Procédé selon la revendication précédente caractérisé en ce que le voile comprend 2,5 à 10% en poids de liant.12. Method according to the preceding claim characterized in that the veil comprises 2.5 to 10% by weight of binder.
13. Procédé selon l'une des revendications précédentes caractérisé en ce que les fibres PVOH introduites au départ sont à l'origine de 25 à 100% du poids total de liant dans le voile.13. Method according to one of the preceding claims, characterized in that the PVOH fibers introduced at the start are responsible for 25 to 100% of the total weight of binder in the web.
14. Procédé selon l'une des revendications précédentes caractérisé en ce que le liant est exclusivement du PVOH.14. Method according to one of the preceding claims, characterized in that the binder is exclusively PVOH.
15. Procédé selon l'une des revendications précédentes caractérisé en ce que le voile comprend au moins 80% en poids de verre sous forme de filaments.15. Method according to one of the preceding claims characterized in that the veil comprises at least 80% by weight of glass in the form of filaments.
16. Voile comprenant des filaments de verre et au moins un liant tel que Rτ / (L . G) > 0,03 dans laquelle Rj représente la moyenne des résistances à la traction en daN pour 5 cm pour le sens long et le sens travers, L représente le taux de liant en % en poids, et G représente le grammage en g/m2.16. Veil comprising glass filaments and at least one binder such as R τ / (L. G)> 0.03 in which Rj represents the average of the tensile strengths in daN for 5 cm for the long direction and the direction crosswise, L represents the binder content in% by weight, and G represents the grammage in g / m 2 .
17. Voile selon la revendication précédente caractérisé en ce que RT / (L . G) > 0,035.17. Sailing according to the preceding claim characterized in that RT / (L. G)> 0.035.
18. Voile selon l'une des revendications de voile précédentes caractérisé en ce qu'il comprend des filaments de verre et de cellulose dans le rapport massique verre / cellulose suivant : 99/1 à 80/20.18. Veil according to one of the preceding veil claims, characterized in that it comprises glass and cellulose filaments in the following glass / cellulose mass ratio: 99/1 to 80/20.
19. Voile selon l'une des revendications de voile précédentes caractérisé en ce qu'il comprend des filaments de verre et de polyester dans le rapport massique verre / polyester suivant : 99/1 à 70/30. 19. A veil according to one of the preceding veil claims characterized in that it comprises glass and polyester filaments in the following glass / polyester mass ratio: 99/1 to 70/30.
20. Voile selon l'une des revendications de voile précédentes caractérisé en ce qu'il comprend au moins 80% en poids de verre sous forme de filaments.20. Veil according to one of the preceding veil claims characterized in that it comprises at least 80% by weight of glass in the form of filaments.
21. Voile selon l'une des revendications de voile précédentes caractérisé en ce qu'il comprend 1,5 à 15% en poids de liant PVOH. 21. Veil according to one of the preceding veil claims, characterized in that it comprises 1.5 to 15% by weight of PVOH binder.
22. Voile selon la revendication précédente caractérisé en ce qu'il comprend22. Sailing according to the preceding claim characterized in that it comprises
2,5 à 10% en poids de liant PVOH. 2.5 to 10% by weight of PVOH binder.
23. Voile selon l'une des revendications de voile précédentes caractérisé en ce qu'il ne comprend pas de PVC. 23. Sail according to one of the preceding sail claims, characterized in that it does not include PVC.
EP20030735782 2002-03-20 2003-03-19 Veil with a pvoh fibre binding agent Expired - Lifetime EP1485536B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0203443A FR2837503B1 (en) 2002-03-20 2002-03-20 PVOH FIBER BINDER
FR0203443 2002-03-20
PCT/FR2003/000869 WO2003078733A2 (en) 2002-03-20 2003-03-19 Veil with a pvoh fibre binding agent

Publications (2)

Publication Number Publication Date
EP1485536A2 true EP1485536A2 (en) 2004-12-15
EP1485536B1 EP1485536B1 (en) 2005-12-14

Family

ID=27799103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030735782 Expired - Lifetime EP1485536B1 (en) 2002-03-20 2003-03-19 Veil with a pvoh fibre binding agent

Country Status (18)

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US (2) US7402225B2 (en)
EP (1) EP1485536B1 (en)
JP (1) JP2005527709A (en)
KR (1) KR20040097165A (en)
CN (1) CN100357519C (en)
AT (1) ATE312973T1 (en)
AU (1) AU2003236863A1 (en)
BR (1) BR0308362A (en)
CA (1) CA2479360A1 (en)
DE (1) DE60302774T2 (en)
ES (1) ES2253685T3 (en)
FR (1) FR2837503B1 (en)
MX (1) MXPA04009097A (en)
NO (1) NO20044295L (en)
PL (1) PL204758B1 (en)
RU (1) RU2308558C2 (en)
UA (1) UA76845C2 (en)
WO (1) WO2003078733A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2849655B1 (en) 2003-01-08 2005-02-11 Saint Gobain Vetrotex MANUFACTURE OF A SAIL IN FIBERS OF GLASS AND CELLULOSE IN CATIONIC ENVIRONMENT
RU2478747C2 (en) * 2011-05-16 2013-04-10 Владимир Климентьевич Дубовый Paper-like nanocomposite based on mineral fibers and inorganic binders
CN102979009A (en) * 2012-12-13 2013-03-20 苏州维艾普新材料有限公司 Chopped glass fiber core material harmless to human body and preparation method thereof

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Publication number Priority date Publication date Assignee Title
JPS584618B2 (en) * 1977-08-23 1983-01-27 三菱製紙株式会社 Manufacturing method of glass sheet base material
US4234379A (en) * 1978-06-02 1980-11-18 The Dexter Corporation Process for producing a uniform fiber dispersion and machine made light weight glass fiber web material
US4810576A (en) * 1985-09-30 1989-03-07 Ppg Industries, Inc. Treated glass fibers and aqueous dispersion and nonwoven mat of the glass fibers
FR2709485B1 (en) * 1993-08-30 1995-11-17 Arjo Wiggins Sa Mineral veil.
US20030008586A1 (en) * 1999-10-27 2003-01-09 Johns Manville International, Inc. Low binder nonwoven fiber mats, laminates containing fibrous mat and methods of making
US6291552B1 (en) * 1999-10-29 2001-09-18 Owens Corning Fiberglas Technology, Inc. Method for producing a glass mat
FR2804677B1 (en) * 2000-02-09 2002-08-30 Vetrotex France Sa GLASS SAIL AND ITS USE FOR SEALING COATINGS
US6767851B1 (en) * 2000-04-05 2004-07-27 Ahlstrom Glassfibre Oy Chopped strand non-woven mat production
FR2836934B1 (en) * 2002-03-06 2004-05-07 Saint Gobain Vetrotex MAT OF WET CUT WIRES
FR2849655B1 (en) * 2003-01-08 2005-02-11 Saint Gobain Vetrotex MANUFACTURE OF A SAIL IN FIBERS OF GLASS AND CELLULOSE IN CATIONIC ENVIRONMENT

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Title
See references of WO03078733A2 *

Also Published As

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RU2004130858A (en) 2005-07-10
CN1643212A (en) 2005-07-20
DE60302774D1 (en) 2006-01-19
RU2308558C2 (en) 2007-10-20
UA76845C2 (en) 2006-09-15
NO20044295L (en) 2004-10-11
PL204758B1 (en) 2010-02-26
ES2253685T3 (en) 2006-06-01
FR2837503A1 (en) 2003-09-26
ATE312973T1 (en) 2005-12-15
WO2003078733A3 (en) 2004-04-01
US7402225B2 (en) 2008-07-22
CN100357519C (en) 2007-12-26
PL371023A1 (en) 2005-06-13
CA2479360A1 (en) 2003-09-25
US20080199668A1 (en) 2008-08-21
BR0308362A (en) 2005-01-25
AU2003236863A1 (en) 2003-09-29
KR20040097165A (en) 2004-11-17
JP2005527709A (en) 2005-09-15
MXPA04009097A (en) 2005-07-13
FR2837503B1 (en) 2004-06-04
DE60302774T2 (en) 2006-09-07
US20050255774A1 (en) 2005-11-17
WO2003078733A2 (en) 2003-09-25
EP1485536B1 (en) 2005-12-14

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