Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
  • C03C25/10—Coating
  • C03C25/12—General methods of coating; Devices therefor
  • C03C25/14—Spraying
  • C03C25/146—Spraying onto fibres in suspension in a gaseous medium
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
  • B05B7/02—Spray pistols; Apparatus for discharge
  • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
  • B05B7/0892—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point the outlet orifices for jets constituted by a liquid or a mixture containing a liquid being disposed on a circle
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
  • C03B37/01—Manufacture of glass fibres or filaments
  • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
  • C03B37/022—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from molten glass in which the resultant product consists of different sorts of glass or is characterised by shape, e.g. hollow fibres, undulated fibres, fibres presenting a rough surface
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
  • C03C25/10—Coating
  • C03C25/12—General methods of coating; Devices therefor
  • C03C25/14—Spraying
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
  • C03C25/10—Coating
  • C03C25/24—Coatings containing organic materials
  • C03C25/255—Oils, waxes, fats or derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
  • C03C25/10—Coating
  • C03C25/24—Coatings containing organic materials
  • C03C25/26—Macromolecular compounds or prepolymers
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
  • C03C25/10—Coating
  • C03C25/48—Coating with two or more coatings having different compositions
  • C03C25/50—Coatings containing organic materials only
• • 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
  • D04H1/4209—Inorganic fibres
  • D04H1/4218—Glass fibres
• • 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
  • D04H1/58—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 by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
  • D04H1/64—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 by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
  • D04H1/655—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 by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions characterised by the apparatus for applying bonding agents

Definitions

• the invention relates to the field of the manufacture of glass wool, and it relates more particularly to the operations and the corresponding systems for spraying sizing composition and anti-dust agent between and / or onto the glass fibers.
• Glass wool manufacturing installations conventionally comprise several successive stations including a melting station, in which molten glass is generated, a fiberizing station, in which fiberglass is created, a sizing station, in which the fibers are bonded together by adding a sizing composition, and a crosslinking station in which the mattress of fibers bonded together obtained previously to transform the glass wool is transformed by heating.
• molten glass is placed in a rotating plate which forms in the fiber-drawing station a centrifuge device, outside of which escape glass fibers which fall in the direction of a conveyor, under the effect of a descending air flow.
• the sizing composition On the passage of the fibers falling towards this conveyor, the sizing composition is sprayed, participating in forming the binder on the passage of the fibers.
• the glued fibers once cooled fall on the conveyor and the mattress thus formed is then directed towards an oven forming the crosslinking station, in which the mattress is simultaneously dried and subjected to a specific heat treatment which causes polymerization (or "Hardening") of the binder resin present on the surface of the fibers.
• the continuous glass wool mattress is then intended to be cut to form, for example, panels or rolls of thermal and / or acoustic insulation.
• the projection of binder is controlled at the time of the passage of the fibers to be bonded.
• a binder projection device comprising two annular rings carrying spray nozzles and inside which pass the glass fibers successively.
• a first ring is connected to a binder tank and each spray nozzle associated with this first ring is configured to receive on the one hand a quantity of this binder and on the other hand a quantity of compressed air via an independent supply for spraying of the binder in the passage of the glass fibers.
• a fatty substance for example mineral oil, silicone oil or even vegetable oil, emulsified or not, the properties of which make it possible to retain the dust. This is particularly the case when the installation makes it possible to obtain glass wool, which is more particularly intended for domestic use and for which it is desired for the end user a product releasing less dust.
• Document WO2010 / 120748 discloses a binder in which the oil is present in the form of an emulsion for its anti-dust properties.
• This document aims to describe a binder composition comprising a determined percentage of oil in its mass composition, in order to allow obtaining a final fibrous product which is soft to the touch and which does not lose a lot of fibers.
• the quantity of oil present in the final product is defined, and it is specified that the oil emulsion can be introduced into the network of fibers in at the same time as the binder or after it, without information being disclosed on the step of applying the oil emulsion in the fiber network.
• Document WO2018 / 042085 discloses a binder in which the oil present in the form of an emulsion is added so as to have a calibrated diameter of oil droplets. This document provides information on the calibration of the droplets and discusses how the sizing composition is mixed with the oil-in-water emulsions forming an anti-dust agent. In this document, the application of the sizing composition to the fibers of the glass wool is carried out by means of a spray crown comprising a plurality of nozzles.
• the oil-in-water emulsion is introduced into the sizing composition by injection of a flow of oil-in-water emulsion in the flow of composition d glue supplying the spray crown.
• the oil-in-water emulsion is added to a reservoir containing the sizing composition and the mixture obtained is stirred until a homogeneous distribution of the oil droplets, upstream of the crown of spray.
• the oil is present in or on the torus of glass fibers in the form of oil droplets trapped in droplets of water or binder.
• the fraction of oil effective in retaining dust is that spread over the surface of the layer of hardened binder at the end of the baking step, that is to say on the surface forming an interface between the binder and the air.
• the oil must therefore separate - during the application step on the fibers or immediately after - from the other ingredients present in the binder to form a surface layer coating the binder layer. Indeed, oil droplets trapped in the hardened binder would be ineffective in retaining dust particles.
• the present invention is part of this context and aims to propose a method and an associated assembly for spraying onto glass fibers, a binder composition and an anti-dust agent which allows an improved reduction of dust, and including faster implementation of anti-dust properties.
• binders based on phenolic compounds, for which both the spraying of the binder, the mixing of the binder with the fibers and the passage in the oven of these sized fibers are easily controlled by industrial.
• Phenolic resins used for several decades as binders are increasingly replaced by products from renewable sources and emitting little or no formaldehyde, also called "Green Binders”. It is thus known, for example from US 8197587 and from US 2011/0223364, to bind glass fibers with aqueous formaldehyde-free sizing compositions containing, as heat-crosslinkable reagents, carbohydrates and polycarboxylic acids.
• the present invention can be used in the context of the use of a binder based on bio-based products, that is to say a binder without phenolic components, and therefore more ecological, to form a " green binder ”, also known as“ Green Binder ”.
• a green binder also known as“ Green Binder ”.
• spraying is made more complicated because the components of this green binder generate a binder more viscous than the phenolic type binder. For this, it is necessary to add water to the green binder before it is projected onto the fiber core. This additional water supply can pose a problem of evaporation in the stations following the gluing station.
• the present invention also falls within this context and aims to propose a process and an associated assembly for spraying onto glass fibers, a binder composition and an anti-dust agent which allows a management of the water used in the operations for producing glass wool, and in particular a controlled supply of water upstream of the oven.
• the invention relates to a system for spraying products onto glass fibers configured to spray onto the fibers at least one sizing composition and an anti-dust agent.
• the projection system comprises two separate annular projection elements arranged successively on the path of the glass fibers, the two projection elements comprising a first annular projection element of the sizing composition and a second annular projection element of the anti-dust agent, respectively produced by at least one specific annular ring surrounding the glass fibers on which said products are sprayed, the second annular projection element of the dust-proof agent being arranged downstream of the first annular spray projection element the sizing composition relative to the path of the glass fibers.
• the product projection system allows an independent projection of the anti-dust agent, which favors a direct distribution of this agent on the external surface of the glass fibers bonded with binder, and which thus allows a better action of this agent on dust.
• the distinction between the stages of spraying of binder and anti-dust, and their succession with a spray of anti-dust agent downstream of the spray of binder makes it possible to ensure the disposal of the dust-proof agent.
• this anti-dust agent is not embedded in the thickness of the binder of the glued glass fibers. The effectiveness of this anti-dust agent is improved.
• the anti-dust agent is whole oil.
• whole oil is meant an oil which is not diluted and which is not injected into the glass fibers in the form of an emulsion.
• the presence of two separate projection elements in the product projection system facilitates the projection of whole oil, the high viscosity of which makes transport and projection special.
• the fact that the distribution of the anti-dust agent is carried out separately, distinctly from that of the sizing composition makes it possible to choose, for example according to the type of sizing composition used, in what form. anti-dust agent, and more particularly mineral oil, silicone oil or vegetable oil must be brought into its projection element.
• a sizing composition taking the form of a binder based on biobased products which, as may have been specified previously, implies an increased presence of water to facilitate its distribution in the network of glass fibers , it may thus be preferred to spray a whole oil without emulsion, in order to limit the amount of water present in the end in the glass fiber mat brought to the oven.
• This limitation allows on the one hand an improvement in the quality of the final product and on the other hand an economy in the transport of oil to the manufacturing site, because only the oil is therefore to be transported, and no longer l oil and water necessary for the emulsion.
• the stability of the liquid is more reliable in the case of using a whole oil than in the case of an emulsified oil for which it is important to use the oil in the short or medium term. under penalty of no longer having an emulsified oil available under the prescribed conditions.
• At least the second annular element for projecting the anti-dust agent is configured so that the annular ring comprises two separate distribution circuits and among which a first distribution circuit makes it possible to convey the anti-dust agent and a second distribution circuit for conveying compressed air;
• a distribution conduit is specifically dedicated to the transport of the anti-dust agent; it can therefore be implemented both specific pumps and temperature control means, the change in the distribution temperature of this anti-dust agent, and in particular of the whole oil, making it possible to modify its viscosity and its penetration rate in glass fibers;
• the first distribution circuit has an average section of diameter less than the diameter of the average section of the second distribution circuit
• the second annular projection element of the anti-dust agent comprises a plurality of spraying members arranged between the two distribution circuits so as to be in fluid communication with each of said distribution circuits;
• the spraying members are nozzles with external mixing; these nozzles are particularly suitable for spraying a high-viscosity anti-dust agent;
• the spraying members can be configured to project a flat jet; it should be noted that the choice of these nozzles makes it possible to generate a more homogeneous projection with the overlap of the jets; -
• the annular ring forming the second annular projection element of the anti-dust agent comprises a single supply and a plurality of orifices communicating respectively with a spraying member.
• the annular elements for projecting the anti-dust agent and the sizing composition are produced distinctly by respective annular rings, the passage section of the annular crown dedicated to the projection of the anti dust agent having a value lower than that of the passage section of the annular ring dedicated to the projection of the sizing composition.
• the two separate annular projection elements according to the invention have similar annular shapes facilitating the integration of the projection device comprising these two annular projection elements in a glass wool manufacturing installation.
• the annular shapes are similar, it should be noted that the dimensions are different in order to adapt one of the projection elements to the specificities of the anti-dust agent, and in particular of the whole oil when it is used. .
• the viscosity of such an oil implies a much lower flow rate than that of the sizing composition, so it is desirable to reduce the passage section of the projection element dedicated to the projection of oil relative to to the projection element dedicated to the projection of sizing composition.
• the second annular projection element comprises spraying members and that the circulation rate of the anti-dust agent between oi and iokg / h per organ, and more particularly between 0.2 and 3 kg / h / organ.
• a particular value of this flow rate can in particular be of the order of ikg / h / organ.
• the first annular projection element comprises projection nozzles and that the flow rate of circulation of the sizing composition comprised between iokg / h and 30 kg / h per nozzle, and more particularly between 50 and 150 kg / h / nozzle.
• a particular value of this flow rate can in particular be of the order of 50 to 7 kg / h / nozzle.
• the dynamic viscosity of the anti-dust agent capable of being sprayed onto previously glued fibers measured here in centipoise for a given temperature of the anti-dust agent of 20 ° C.
• a dynamic viscosity of the oil can be between 300 and 2ioocP, more particularly from 300 to 6oocP at 20 ° C.
• Advantage is taken of the fact that the viscosity drops with a rise in temperature.
• an oil is advantageously used whose viscosity at 40 ° C is less than 200CP, preferably less than 140CP at 40 ° C.
• spraying members and nozzles are regularly distributed over the annular ring dedicated to the projection of the anti-dust agent and on the annular ring dedicated to the projection of the sizing composition, the spraying members distributed over the annular ring dedicated to the projection of the anti-dust agent being less in number than the number of spray nozzles distributed over the annular ring dedicated to the projection of sizing composition.
• the spraying members distributed on the annular ring dedicated to the projection of the anti-dust agent are between five and fifteen and the spray nozzles distributed on the annular ring dedicated to the projection of composition of sizing is between five and forty-two, the number possibly varying in particular depending on the type of spray nozzles used.
• the number of spraying members provided on the annular ring dedicated to the projection of the anti-dust agent can be equal to eight, while the number of spray nozzles provided on the annular ring dedicated to the projection of the sizing composition can be equal to seven or nine for a first type of nozzle and equal to sixteen or twenty-four for a second type of nozzle.
• the invention also relates to an installation for manufacturing glass wool comprising a system for projecting products onto glass fibers as previously mentioned.
• the installation is configured in such a way that the projection system is arranged on the glass fiber path at the outlet of a fiberizing station and upstream of a conveyor configured to bring the glass fibers on which have been were screened said products.
• the installation may include a whole oil tank directly connected to the second annular projection element of the anti-dust agent.
• a pump, and where appropriate a device for measuring the temperature of the oil brought into the spraying element, may be provided elsewhere.
• the invention further relates to a process for manufacturing glass wool during which a successive spraying, at the outlet of a fiberizing station in which molten glass is transformed into glass fibers, a sizing composition and then l oil forming an anti-dust agent.
• the spraying of the whole oil is carried out between the spraying of the sizing composition and a step of hardening a carpet of glued and oiled glass fibers.
• the step of spraying the oil forming the anti-dust agent is carried out as close as possible to the step of spraying the sizing composition in order to avoid dust as quickly as possible in the sized fibers. And this oil spraying step is advantageously carried out before the oven in which the sizing composition finishes hardening.
• FIG. i is a schematic representation of a part of a glass wool manufacturing installation, in particular illustrating a projection system according to one aspect of the invention in which a sizing composition and then an anti-dust agent are sprayed onto a fiber core via two successive annular projection elements;
• FIG. 2 is a detailed view of the projection system shown schematically in Figure 1, in which the two annular projection elements have been made more visible;
• FIG. 3 is a perspective view of the annular projection element caused to project the anti-dust agent according to one aspect of the invention and forming part of the projection system of Figure 2;
• FIGS. 4 and 5 are sectional views of a spray nozzle caused to equip one and the other of the annular projection elements
• FIG. 6 is a bar graph illustrating the results of tests for the presence of dust in a volume of fibers passed through a standard projection system and in a projection system according to one aspect of the invention.
• the invention relates to the implementation of specific devices for the successive spraying of a sizing composition, or binder, and of a dust-proofing agent onto a toroid of glass fibers.
• the anti-dust agent is sprayed separately from the binder, after the latter, so that it is on the surface of the glass fibers and that the effectiveness of its anti-dust functions is immediate.
• Illustrated in FIG. 1 is a part of an installation 100 for manufacturing glass wool, and more particularly different successive stations. participating in the creation of an insulating mattress composed of glued glass fibers composing an insulating material such as glass wool.
• a first station called fiberizing station 1
• a binder here a "green binder
• the bonded and oiled fibers are placed in a forming station on a conveyor 4, which takes them to an oven forming a crosslinking station 5 and inside which they are heated to crosslink the binder.
• the conveyor 4 is permeable to gases and to water, and it extends above suction boxes 6 for gases such as air, fumes and excess aqueous compositions resulting from the fiberizing process previously described. There is thus formed on the conveyor 4 a mattress 7 of glass wool fibers intimately mixed with the sizing composition. The mattress 7 is led by the conveyor 4 to the oven forming the crosslinking station 5 of the binder.
• the fiberizing station 1 is here configured for the implementation of a fiberizing process by internal centrifugation. It will be understood that any type of centrifugation and associated centrifuge can be implemented with the lessons which will follow as soon as fibers are obtained at the outlet of the centrifuge for their passage to come into the gluing station.
• the molten glass can be brought into a net 14 from a melting furnace and first recovered in a centrifuge 12, then to escape via holes drilled in the side wall of the plate in the form of a multitude of filaments driven in rotation.
• the centrifuge 12 is also surrounded by an annular burner 15 which creates, at the periphery of the wall of the centrifuge, a gas stream at high speed and at a sufficiently high temperature to stretch the glass filaments into fibers in the form of a torus 16.
• fiberizing station is indicative and not limiting of the invention, and that we can also provide a fiberizing process by internal centrifugation with a basket and a perforated bottom wall, or with a plate with a solid bottom, as soon as the molten glass stretches by centrifugation to subsequently spread in the form of a toroid of fibers 16 in the gluing station.
• the fiber core 16 thus created at the outlet of the fiberizing station is brought to pass through a projection system 20 specific to the invention in that it comprises two distinct annular projection elements 120, 220 and arranged successively along the passage fiber core.
• a first annular projection element 120 is configured to surround the core of fibers and allow the projection of a sizing composition 121 formed, for example, by a "green binder", the first annular projection element being denoted by the continued sizing device 120, of which only two spray nozzles 122 are shown in FIG. 1.
• a second annular projection element 220 is configured to surround the toroid of fibers leaving the first annular projection element and to allow the projection of an oil 221, for example whole oil, the second annular projection element being denoted by the following oil projection device 220, of which only two spraying members 222 are shown in FIG. 1.
• oil projection device 220 of which only two spraying members 222 are shown in FIG. 1.
• the sizing device 120 comprises an annular ring having a general shape of revolution around an axis of revolution X-X.
• the crown comprises two separate distribution conduits offset along the axis of revolution X-X and a plurality of spray nozzles 122 arranged between these two distribution conduits and configured to ensure fluid communication with the distribution conduits.
• the annular ring of the sizing device 120 comprises in particular a first annular tube 123 inside which a first distribution duct is formed to allow circulation of the sizing composition, as well as a second annular tube 125, which extends along a plane of revolution, perpendicular to the axis of revolution XX of the annular ring, and parallel to the plane of revolution of the first annular tube 123.
• a plane of revolution P of the annular projection device as being one or the other of the planes of revolution as they have just been described, or at the very least a plane parallel to them.
• a second distribution duct is provided inside this second annular tube 125 to allow the circulation of compressed air, capable of projecting the sizing composition 121 onto the fibers passing through the sizing device 120.
• the first annular tube 123 has a tubular shape whose internal wall, delimiting the first distribution conduit, has a constant section, or substantially constant over the entire periphery of the tube.
• substantially constant section is meant a section which remains the same with a spacing margin of less than 5%.
• the section average of the first annular tube can have a diameter Di of between 15mm and 30mm.
• the first annular tube 123 has a single supply area 127 in which is attached a supply pipe 128 of the sizing composition, connected at its other end to a reservoir of this sizing composition not shown here.
• the sizing composition here consists of a binder with a low formaldehyde content, preferably even without formaldehyde, which will subsequently be described as a binder based on bio-based products, or “green binder”, it being noted that the viscosity of these bio-based products involve the use of water in large quantities to dilute the whole and form a binder capable of being sprayed by the nozzles.
• the supply pipe 128, by which “the green binder”, or else binder based on bio-based products, is brought into the sizing device, is here arranged parallel to the axis of revolution of the annular distribution ring, but it is understood that one could arrange this supply differently without departing from the context of the invention. It should however be noted that according to a characteristic of the invention, the "green binder” is injected into the first distribution conduit of the first annular tube via a single supply zone, the "green binder” being intended moreover to circulate all around the first distribution duct.
• the first annular tube 123 delimiting the first distribution conduit also comprises a plurality of outlet orifices, regularly distributed over the entire periphery of the first annular tube. As will be described in more detail below, each of these outlet orifices opens onto a spray nozzle 122 arranged to be in fluid communication with the first distribution conduit via the corresponding outlet orifice.
• the first annular tube 123 is dedicated to the distribution of the "green binder" in the direction of the spray nozzles 122. i ⁇
• the second annular tube 125 has a tubular shape whose internal wall, delimiting the second distribution conduit, has a constant section, or substantially constant over the entire periphery of the tube.
• substantially constant section is meant a section which remains the same with a spacing of less than 5%.
• the average section of the second annular tube can have a diameter D2 between 30mm and 50mm.
• the second annular tube 125 has a single supply zone 131 in which a supply connection 131 ’is attached for a compressed air supply.
• the compressed air supply connection 131 ′ is arranged parallel to the axis of revolution of the annular distribution ring and parallel to the supply pipe 128 of “green binder”, but it is understood that this could be arranged differently. supply of compressed air without departing from the context of the invention. It should however be noted that according to a characteristic of the invention, the compressed air is injected into the second distribution duct of the second annular tube via a single supply zone, the compressed air being intended moreover to circulate over all the periphery of the second distribution duct.
• the second annular tube 125 delimiting the second distribution conduit also comprises a plurality of outlet orifices, regularly distributed over the entire periphery of the second annular tube.
• each of these outlet orifices opens onto a spray nozzle 122 arranged to be in fluid communication with the second distribution conduit via the corresponding outlet orifice, each of the spray nozzles 122 of the sizing device 120 being in fluid communication on the one hand with the first distribution conduit and on the other hand with the second distribution conduit. It follows from the above that the second annular tube 125 is dedicated to the distribution of compressed air towards the spray nozzles 122.
• This second annular tube 125 delimiting the second distribution conduit dedicated to the circulation of compressed air, is disposed above the first annular tube 123, delimiting the first distribution conduit dedicated to the circulation of the sizing composition.
• the diameter of the ring formed by the first annular tube is greater than the corresponding diameter of the second annular tube, so that these two annular tubes are arranged one above the other with a radial offset so that the second tube annular is more inside than the first annular tube.
• Different alternative embodiments can be provided in which the spray nozzles are fixed on the annular tubes so that their angle of inclination relative to the axis of revolution is constant over the entire periphery of the annular projection device or else that this angle of inclination varies from one nozzle to another.
• the first and second annular tubes are configured so that their internal wall respectively delimiting the first and second distribution conduits has a different average section from one another.
• the internal wall of the second tube defines an average section of diameter greater than the diameter of the average section of the internal wall of the second annular tube.
• the passage section for the "green binder" is thus smaller than the passage section for compressed air.
• first annular tube and the second annular tube.
• these two annular tubes have a constant mean section. It is understood that the viscous nature of these components presents a risk of seeing them remain attached to any excessively marked roughness inside the annular tube and that the context of application of these green binders in the annular projection device according to the invention implies taking into account this surface roughness and the dimensioning of the annular tube in which the green binder is caused to circulate.
• the annular tubes 123, 125 are arranged one above the other in such a way that the first outlet orifices of the first distribution duct and the second outlet orifices of the second distribution duct are superposed axially, that is to say ie they are angularly distributed in the same way around the corresponding axis of revolution of the conduit.
• the spray nozzle 122 which puts in fluid communication a first outlet orifice of the first distribution duct with a second outlet orifice of the second distribution duct, extends axially, that is to say in a plane comprising the axis of revolution XX of the annular crown.
• the spray nozzle 122 comprises a body 132 which extends between the two annular tubes, a liquid nozzle which extends across this body 132 along an axis of orientation AA and at the free end of which is disposed a spray head, or air cap, configured to allow nebulization of the binder based on bio-based products, or "green binder", according to a flat jet.
• the set of spray nozzles 122 is arranged so as to have an angle of inclination a between the orientation axis AA of the liquid nozzle and the plane of revolution P of the annular projection device here equal to 40 °.
• the spray nozzles can have a common angle of inclination, between 0 and 80 °.
• each spray nozzle 122 is welded to the annular tubes, once its ends are placed opposite the outlet orifices provided in each of the tubes.
• the body 132 has in its center internal channels configured to separately bring the compressed air and the sizing composition near the spray head, which has a domed shape defining a mixing chamber at the outlet of the liquid nozzle, in which the compressed air and the sizing composition mix to form the drops which are caused to be projected via a spraying slot formed in the spraying head.
• the spray nozzle 122 is configured to allow fluid communication between the first distribution duct of the first annular tube 123 and the second distribution duct of the second annular tube 125, and that the spray slot, through which the binder base of bio-based products comes out of the annular projection device, is configured for the projection of a sizing spray on the fiber core and the dispersion of this spray over a determined angular range.
• the operation of the sizing device equipped with at least one spray nozzle as just described is as follows.
• Appropriate control means make it possible to control the arrival of the “green binder” inside the first distribution conduit via the supply pipe 128.
• the “green binder” is pushed to circulate around the entire periphery of the annular tube delimiting this first distribution conduit, and to circulate towards each of the first orifices 129 communicating with the spray nozzle 122.
• the “green binder” penetrating into the spray nozzle 122 passes inside the liquid nozzle and is pushed towards the head and the mixing chamber.
• suitable control means allow the compressed air supply to be controlled, at a desired flow and pressure, inside the second distribution conduit via the supply connection 131 '.
• the air flow and pressure are in particular determined as a function of the dosage of the sizing composition.
• the compressed air is pushed to circulate around the entire periphery of the annular tube delimiting this second distribution conduit, and to circulate towards each of the second orifices communicating with the spray nozzle 122.
• the compressed air penetrating into the spray nozzle 122 is pushed into circulation pipes at the periphery of the liquid nozzle towards the spray head and the mixing chamber, in which the mixture of compressed air and “green binder” participates in the nebulization of the binder, controlling the flow of air as a function of the quantity of binder sprayed, making it possible in particular to influence the size of the drops.
• the spray nozzles 122 associated with the first annular projection element 120 here have an internally mixed structure, as illustrated by way of example in FIG. 5.
• the sizing device comprises a plurality of spray nozzles distributed angularly regularly over the entire periphery of the crown.
• the sizing device comprises a series of twenty-four spray nozzles, so that the angular spacing between two successive nozzles of the series is 15 ° in a plane perpendicular to the axis of the fiber core.
• the oil distribution device 220 forming the second annular projection element is arranged downstream of the sizing device 120 relative to the path of the glass fibers.
• the oil distribution device 220 comprises an annular ring having a general shape of revolution around an axis of revolution parallel and advantageously coincident with the axis of revolution XX previously described.
• Two separate distribution circuits offset by a distance d along the axis of revolution XX are provided, similar to the distribution conduits of the sizing device, and a plurality of spraying members 222 are arranged between these two. distribution circuits and configured to ensure fluid communication with the distribution circuits.
• the annular ring of the oil distribution device comprises in particular a first tubular distribution circuit 223 configured to allow a circulation of anti-dust agent, here in the form of whole oil, as well as a second tubular distribution circuit 225, which extends along a plane of revolution parallel to the plane of revolution of the first tubular distribution circuit 223.
• the second tubular distribution circuit 225 is configured to allow a circulation of compressed air, capable of projecting the whole oil onto the fibers passing through the projection system according to one aspect of the invention.
• the first tubular distribution circuit 223 has a tubular shape, the internal wall of which has a constant section, or substantially constant over the entire periphery of the tubular circuit.
• substantially constant section is meant a section which remains the same with a spacing of less than 5%.
• a mean section of the first tubular distribution circuit 223 will be given below, with reference to the structural differences existing between the two annular projection elements.
• the first tubular distribution circuit 223 comprises a single supply zone 231 in which is attached a supply pipe 231 ′ of a whole oil, connected at its other end to a reservoir 300 of this whole oil shown diagrammatically in the figure 1.
• the anti-dust agent is advantageously a whole oil which does not need to be injected in the form of an emulsion, so that the oil reservoir whole is directly connected to the first tubular distribution circuit 223, a pump being provided specifically between the oil tank and the second annular projection element 220 to allow the whole oil, which has a high viscosity, to reach this first tubular distribution circuit.
• the first tubular distribution circuit 223 has a plurality of outlet orifices, regularly distributed over the entire periphery of the first tubular distribution circuit, and each of these outlet orifices opens onto a spraying member 222 arranged to be in fluid communication with the first tubular distribution circuit via the corresponding outlet orifice.
• the first tubular distribution circuit 223 is dedicated to the distribution of the anti-dust agent, that is to say here the whole oil, towards the spraying members 222.
• the second tubular distribution circuit 225 has a tubular shape whose internal wall has a constant section, or substantially constant over its entire periphery.
• substantially constant section is meant a section which remains the same with a spacing of less than 5%.
• the second tubular distribution circuit 225 comprises a single supply zone 227 in which a supply connection 228 is attached for a compressed air supply. Again, the compressed air is injected into the second tubular distribution circuit via a single supply zone, the compressed air also being intended to circulate around the entire periphery of the second tubular distribution circuit.
• supply pipes and fittings specific to the second annular projection element 220 have different orientations, and here perpendicular, to those of the supply pipes and fittings. specific to the first annular projection element 120, for reasons of space.
• the second tubular distribution circuit 225 comprises a plurality of outlet orifices, regularly distributed over the entire periphery of the second tubular distribution circuit, each of these orifices outlet opening onto a spraying member 222 arranged to be in fluid communication with the second tubular distribution circuit 225 via the corresponding outlet orifice.
• each of the spraying members 222 of the oil distribution device 220 is in fluid communication on the one hand with the first tubular distribution circuit 223 and on the other hand with the second tubular distribution circuit 225.
• the second tubular distribution circuit 225 dedicated to the circulation of compressed air, is arranged above the first tubular distribution circuit 223, dedicated to the circulation of oil.
• the second tubular distribution circuit 225 disposed above the first tubular distribution circuit 223 is disposed as close as possible to the first annular projection element 120, so that the glass fibers which have just been bonded are caused to pass through completely. 'first through the second tubular distribution circuit dedicated to compressed air.
• the diameter of the ring formed by the first tubular distribution circuit is greater than the corresponding diameter of the second tubular distribution circuit, so that these two tubular elements are arranged one above the other with a radial offset so that the second tubular circuit is more inside than the first tubular circuit.
• the spraying members are fixed to the tubular circuits so that their angle of inclination relative to the plane of revolution of the annular device is constant over the entire periphery of the annular projection element or else so that this angle of inclination varies from organ to organ.
• a particular embodiment provides a constant angle of inclination of approximately 25 °.
• the tubular distribution circuits 223, 225 are arranged one above the other such that the first outlet orifices of the first tubular circuit and the second outlet orifices of the second tubular circuit are superposed axially, that is to say that is to say they are angularly distributed in the same way around the axis of revolution of the second annular projection element 220.
• the spraying member 222 which puts in fluid communication a first outlet orifice of the first tubular circuit with a second outlet orifice of the second tubular circuit, extends axially, that is to say in a plane including the axis of revolution XX.
• the spraying member 222 comprises a body 232 which extends between the two tubular circuits and a liquid nozzle which extends across this body along an axis of orientation A-A.
• the set of spraying members 222 is arranged so as to have an angle of inclination a between the orientation axis AA of the liquid nozzle and the plane of revolution P of the annular projection device here equal to 25 °.
• the spraying members can have an angle of inclination of between 10 ° and 80 °, and more particularly between 25 ° and 6o °. An even more precise range can be between 25 ° and 45 °, with the preferred value of 25 ° previously mentioned. It is understood that the inclination value of the nozzles of each ring must meet, according to the invention, a first requirement specific to the projection at the level of each crown and a second requirement specific to the combined projection of the two rings.
• the first requirement is such that on the one hand the binder and the oil must respectively reach the core of fibers, so that the angle of inclination cannot be close to 90 ° and such that on the other hand the binder and the oil must not arrive substantially perpendicular to the direction of flow of the toroid of fibers so as not to rebound and return to the spraying members, so that the angle of inclination cannot be close to o °.
• the second requirement is such that the angles of inclination of the members and of the spray nozzles must allow the binder to impact the fiber core before the oil does. In this way, it is advantageous that the angle of inclination of the spraying members 22 is at least equal to the angle of inclination of the spray nozzles.
• each spraying member 222 is welded to the tubular circuits, once its ends are placed opposite the outlet orifices provided in each of the tubes.
• the spray members 222 differ from the spray nozzles 122 previously described in that they consist of nozzles with external mixing.
• FIG. 4 illustrates such an external mixing nozzle respectively forming the spraying members 222 arranged on the second annular projection element.
• the external mixing nozzle does not have a mixing chamber formed by an air cap, but a flared ejection zone 234 at the end of the liquid nozzle and onto which the ends of the channels carrying compressed air.
• Such an external mixing nozzle is particularly advantageous for spraying a product with high viscosity.
• the operation of the oil spraying device equipped with at least one spraying member as just described is as follows.
• Appropriate control means make it possible to control the arrival of the oil inside the first tubular distribution circuit 223 via the supply pipe 231 '.
• the whole oil is pushed to circulate around the entire periphery of the tubular circuit, and to circulate towards each of the first orifices communicating with the spraying member 222.
• the whole oil penetrating into the spraying member 222 passes inside the liquid nozzle and is pushed towards the flared ejection zone 234.
• appropriate control means make it possible to control the supply of compressed air, at a desired flow and pressure, inside the second tubular distribution circuit 225 via the supply connector 228.
• the flow and the air pressure are determined in particular according to the oil flow.
• the compressed air is pushed to circulate around the entire periphery of the second tubular distribution circuit, and to circulate towards each of the second orifices communicating with the spraying member 222.
• the compressed air entering the spraying member 222 is pushed in circulation pipes at the periphery of the liquid nozzle, so as to disturb the output of the flared zone 234 the whole oil.
• the oil distribution device also differs from the sizing device in the number of members and spray nozzles distributed angularly regularly.
• the oil distribution device may comprise a series of eight spraying members, so that the angular spacing between two successive members of the series is 45 ° in a plane perpendicular to the axis of the fiber core, while it is recalled that the sizing device can comprise a series of twenty-four spray nozzles, so that the angular spacing between two successive nozzles of the series is 15 ° in a plane perpendicular to the axis fiber core. It is understood that, for a homogeneous distribution of the nozzles, respectively of the spraying members, the angular spacing corresponds to the division of 360 ° by the number of nozzles, respectively of members, to be provided.
• the first and second tubular distribution circuits are configured so that their internal wall has a mean section different from each other.
• the internal wall of the second tube defines an average section of diameter greater than the diameter of the average section of the internal wall of the second annular tube.
• the passage section for whole oil is thus smaller than the passage section for compressed air.
• At least the first tubular distribution circuit 223 is subjected to a chemical and / or mechanical deburring operation, in order to remove the edges at the connection of the outlet orifices 229 and the supply pipe on this first circuit tubular distribution 223.
• the viscous nature of the whole oil and the low flow rate of the circulation imply this regular surface condition in order to prevent oil from stagnating and collecting inside the duct.
• the spraying of oil takes place separately from the spraying of binder and by means of a specific annular ring surrounding the toroid of glass fibers and arranged downstream of the annular ring specifically dedicated to the projection of binder.
• the oil sprayed on the glass fibers is not covered by the binder, which makes its dust retention action more effective.
• annular crowns differ in particular in the size of the tubes brought to receive the oil. or the binder, in order to adapt these tubes to the viscosity of the fluid circulating within them. They also differ in the design and number of nozzles that these tubes have.
• the dimensions of the annular ring dedicated to the projection of the anti-dust agent that is to say the dimensions of the second annular projection element 220
• the average diameter of the second annular element of projection 220, composed of two superimposed tubular distribution circuits is less than the average diameter of the first annular projection element 120, composed of two superimposed annular tubes.
• the passage section of the tubular distribution circuit traversed by the oil in the second annular projection element 220 is less than the passage section of the annular tube traversed by the binder in the first annular projection element 120 .
• the difference in dimensions mentioned between the annular projection elements 120, 220 is a characteristic linked to the separation of the projections of the binder and of the oil according to the invention, these two products having different properties.
• the higher viscosity and the reduced flow rate of the oil must be taken into account in relation to the viscosity and the flow rate of the binder.
• the oil flow can be of the order of 1 kg / h for a spraying member, in comparison with a flow of the order of 6 kg / h for a spray nozzle in the device gluing.
• the mean section of the first tubular distribution circuit 223 in the second annular projection element 220 can consist of a diameter D3 of between 5 mm and 15mm, while as mentioned above, the mean section of the first annular tube 123 in the first annular projection element 120 may consist of a diameter Di of between 15mm and 30mm.
• the nozzles with external mixture forming the spraying members are configured to generate a flat jet, that is to say a jet which extends in a main direction, here the first direction. More particularly, the nozzles are configured so that the flat jet has in the first direction a determined opening angle which can here be between 40 ° and 120 °. It is advantageous that the first direction is parallel to the planes of revolution of the annular projection elements, that is to say the planes in which each of the annular tubes of the device are inscribed, and therefore 2C
• the spraying members may include a head with a slot of rectangular section which extends mainly in a direction parallel to the plane of revolution of the device.
• the rectangular section of the at least one spray nozzle is arranged so that the long side of the rectangle forming this rectangular section extends parallel to a plane of revolution of the annular projection device .
• the low flow rate of the whole oil circulating in the dedicated annular projection element and the configuration of the spraying members to form a flat jet make it possible to ensure a low penetration force of the oil so that it remains on the surface. glued glass fibers forming the fiber core.
• the results table presented in FIG. 6 illustrates in particular this observation, by representing the number of dust particles present in a given unit of mass of glass wools.
• the anti-dust efficiency of the oil-in-water emulsions according to the invention is evaluated using an internal device.
• a 20 cm x 30 cm sample of glass wool is fixed in a frame so that at least one of its main faces is free.
• a perforated plate having dimensions slightly smaller than that of the sample, fixed on an articulated arm, strikes the free face of the sample.
• An optical device counts the number of particles released. More particularly, the first frame 60, on the left of FIG. 6, represents the number of dust particles for a given unit of mass of a glass wool, in the case of application of oil in the form of an emulsion directly injected into the binder, with a dosage of 0.4% of oil relative to the total weight of glass. An average value of 400 particles is reached, with a significant standard deviation from one measurement to another of the order of 250 particles.
• the second frame 62 illustrates the number of dust particles measured in a unit of equivalent mass, when the oil is sprayed separately from the binder through the projection system described above.
• the advantage of using the projection system with whole oil has also been illustrated, that is to say not in the form of an emulsion.
• the combined advantage of using a whole oil available instantaneously and the implementation of a separate projection makes it possible to reduce the number of dust particles to an average value of approximately 160 particles , with a reduced standard deviation of around 70.
• the combined advantage of using a whole oil available instantaneously and the implementation of a separate projection makes it possible to reduce the number of dust particles to an average value of approximately 150 particles , with a reduced standard deviation of around 20.
• An arrangement in accordance with the invention can be implemented in the device described and illustrated above, and can also be implemented, without departing from the context of the invention, in other embodiments of devices.
• such a device in accordance with the invention in that it comprises a whole oil distribution circuit distinct from a binder distribution circuit and a plurality of nozzles / spraying members communicating fluidly with the circulation circuit. corresponding distribution for projecting the corresponding product onto the glass fibers intended to pass inside the projection system.
• the close position of the two annular projection elements can in particular make it possible to pool the supply of compressed air, in a variant here not shown.

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• General Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Organic Chemistry (AREA)
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• 2018
  • 2018-08-10 FR FR1857442A patent/FR3084884B1/fr active Active
• 2019
  • 2019-07-29 AU AU2019316616A patent/AU2019316616A1/en active Pending
  • 2019-07-29 US US17/267,657 patent/US20210323010A1/en active Pending
  • 2019-07-29 CA CA3106296A patent/CA3106296A1/fr active Pending
  • 2019-07-29 KR KR1020217006775A patent/KR20210041597A/ko not_active Application Discontinuation
  • 2019-07-29 WO PCT/EP2019/070391 patent/WO2020030466A1/fr unknown
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