EP0072301B1 - Procédé et dispositif pour l'amélioration des conditions de formation des matelas de fibres - Google Patents

Procédé et dispositif pour l'amélioration des conditions de formation des matelas de fibres Download PDF

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Publication number
EP0072301B1
EP0072301B1 EP82401429A EP82401429A EP0072301B1 EP 0072301 B1 EP0072301 B1 EP 0072301B1 EP 82401429 A EP82401429 A EP 82401429A EP 82401429 A EP82401429 A EP 82401429A EP 0072301 B1 EP0072301 B1 EP 0072301B1
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EP
European Patent Office
Prior art keywords
gas
current
fibres
removal
fibers
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.)
Expired
Application number
EP82401429A
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German (de)
English (en)
French (fr)
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EP0072301A1 (fr
Inventor
Jean Battigelli
François Bouquet
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Saint Gobain Isover SA France
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Saint Gobain Isover SA France
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Priority to AT82401429T priority Critical patent/ATE14460T1/de
Publication of EP0072301A1 publication Critical patent/EP0072301A1/fr
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Publication of EP0072301B1 publication Critical patent/EP0072301B1/fr
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Classifications

    • 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
    • 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
    • D04H1/4226—Glass fibres characterised by the apparatus for manufacturing the glass fleece
    • 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
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • 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
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
    • 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
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/736—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged characterised by the apparatus for arranging fibres

Definitions

  • the invention relates to techniques for forming fiber mats, in which the fibers carried by a gas stream are collected on a receiving member which separates the fibers from the gases which transport them.
  • Two types of gas action on the mattress being formed are particularly targeted by the invention. On the one hand it is the action related to the amount of heat to which the mattress is subjected, and on the other hand the compression exerted by the gas which crosses the fiber mattress retained on the receiving member. .
  • binder compositions applied in liquid form (usually in the form of aqueous solutions) are subsequently fixed to the mattress by a treatment leading to the formation of “resinous” products.
  • the treatment in question is generally a heat treatment.
  • the binder is at least partially “treated” on the fiber at the receiving member. This precooking is extremely disadvantageous. In fact, it results in fixing the fibers when they are in a condition which is not very favorable for obtaining a mattress having satisfactory characteristics, in particular due to the compression exerted by the circulation of gases. Ultimately the phenomenon can lead to the formation of a very dense mattress unfit for the use for which it is initially intended.
  • An object of the invention is to allow the control of the thermal conditions to which the fibers are subjected on the receiving member.
  • the packing of the fibers on the receiving member is disadvantageous. It should first of all be recalled in this connection that the volume of the products prepared is an important cost factor for storage and transport operations.
  • the fibrous products at the end of the production line are usually packaged in a reduced volume obtained by compression.
  • Products packaged in this way are characterized by the compression ratio. This rate is defined by the ratio of the nominal thickness, that is to say the thickness guaranteed to the user once the product is unpacked, to the thickness of the compressed product as it is in the packaging. Experimentally, it can be seen that this rate can be all the higher as the mattress is less compacted on the receiving member.
  • One of the aims of the invention is therefore to ensure that the mattress is as compacted as possible to allow the increase in the compression ratio and consequently the reduction in storage and transport costs.
  • the invention consists in taking part of the gas stream at the periphery thereof.
  • Induced air first plays a role in how fibers are formed. It appears necessary once the fibers are drawn to ensure that they are very quickly frozen otherwise there is a very significant deterioration in the qualities of the final product.
  • the initial temperature of the drawing gases can reach and even exceed 1500 ° C., while the freezing of the fibers can take place at temperatures of l '' order of 800 ° C. It is therefore necessary that the supply of ambient air induced before sampling according to the invention allows a temperature reduction of nearly 700 ° C. The share of induced air in the gas stream is relatively large.
  • the induced air also intervenes on the structure of the gas stream as we indicate in the following brief analysis.
  • the gas flow in an unconfined atmosphere progresses by entraining induced air throughout its trajectory.
  • the general direction of flow is relatively well defined. If one considers the phenomena in a statistical way one can consider that the motive gas progresses linearly and that the induced air flows on contact with it in the same direction and in the form of layers which are superimposed on the inducing current.
  • the instantaneous examination of the gas stream shows that in the general framework which has just been indicated, the gas masses are subjected to intense turbulence. These turbulences favor a rapid mixing of the induced air and the drawing current, and determine the characteristics of the resulting combined current. This is particularly the case for gas velocities or their temperature. This is also the case for the distribution of fibers in the current.
  • the amount of air induced in the gas stream at the level where the sampling according to the invention is carried out is at least twice that of the gas. initial stretch, and preferably more than three times this amount.
  • the sampling according to the invention is therefore carried out at a certain distance from the orifices generating the drawing gases.
  • the quantities induced are constant along the trajectory.
  • the increase in the mass of gaseous current by entrainment of induced air is proportional to the distance from the origin of the inducing current. This makes it possible to conveniently determine the level at which the sampling should be situated in order to satisfy the conditions indicated above with regard to the relative proportions of induced and inducing gases.
  • the amount of induced air is directly related to the pulse of the inducing current.
  • the impulse during the progression of the current is partly transmitted to the induced air.
  • the quantity of gas concerned in more precise terms the mass flow, that is to say the mass of gas per unit of time) increases but the pulse remains generally constant.
  • the sample according to the invention must correspond to the elimination of a significant part of the pulse.
  • this amount of pulse is preferable to take this amount of pulse as soon as possible, that is to say at a time when it corresponds to a relatively small amount of gas.
  • An important aspect of the invention in addition to the location of the sample is the amount or proportion of the sample current (or that of the pulse withdrawn from the gas stream).
  • the quantity of fibers entrained with the sampled gas must not exceed 2%, and preferably not 1%, of all the fibers, on the one hand to limit the diversion of a certain quantity of fibers, but especially to avoid fouling of the gas treatment circuits sampled.
  • this speed limit corresponds to.
  • the radius of the circular section for the speed '/ z V m is a little less than half the radius corresponding to the periphery of the current.
  • the periphery of the current is defined as necessary -; ent in a somewhat arbitrary manner. There is no clear-cut, so one chooses as the periphery of the current the zone corresponding to an average speed equal to 1% of the maximum speed at the same level.
  • the radius of the periphery of the current is of the order of 2.1 to 2.4 times the radius corresponding to the speed '/ 2 V m .
  • the sample taken in the portion of the stream whose speed is less than 1/2 V m is limited to the amount of gas in the absence of sample present these speed characteristics. If this limit is exceeded, the quantity of entrained fibers progresses appreciably.
  • the quantity withdrawn can, if necessary, equal or even exceed the total quantity of gases carried by the current at the same level in the absence of sampling, while retaining a significant part of the gas current whose flow continues beyond the level of withdrawal.
  • the quantity withdrawn does not exceed that of the current at the same level in the absence of withdrawal and preferably is of the order of 60% of this quantity.
  • the sampling leads experimentally in all cases to a reduction in the quantity of gas passing through the receiving member.
  • the effects of the invention are particularly sensitive when the sample taken results in a reduction of at least 10% of this quantity.
  • the decrease can reach 30% or even more as shown by the examples given in the following description.
  • the speed of sampling does not seem to have a very significant influence on the progress of the operation.
  • the speed of the gases sampled is between 20 and 25 m / s.
  • the conditions for implementing the invention can also be determined as a function of the effects measured at the level of the member for receiving the fibers in the mattress being formed.
  • the speed of the gases in the forming mattress is advantageously less than 3 m / s.
  • the speed of passage of the gases in the mattress must be sufficient to ensure their regular flow upstream of the receiving member.
  • the amount of gas withdrawn according to the invention is therefore adjusted in combination with the suction under the receiving member to ensure the passage of all the gas flow carrying the fibers at as low a speed as possible.
  • the invention makes it possible to reduce the pressure drop corresponding to the crossing of the mattress under formation.
  • the sampling according to the invention is advantageously such that the reduction in pressure drop is at least 25% compared to that observed under the same conditions in the absence of sampling.
  • the quantity of gas withdrawn must also be sufficient for the temperature in the forming mattress to be lower than that for which a risk of “pre-baking” could exist.
  • the temperature in the mattress is advantageously less than 90 ° C and preferably less than 80 ° C.
  • the invention also relates to devices for implementing the method described above.
  • the devices according to the invention for forming a mattress of fibers conveyed by a gas stream comprise means arranged on the path of the gas stream between the current generator and the member for separating the fibers and the gas stream, these means ensuring the removal of part of the gas stream at the periphery thereof.
  • the sampling means are arranged uniformly on the periphery of the current. It is however possible to ensure that the sampling is more intense in certain places of the periphery when, for example, the geometry of the fiberizing assembly leads to the formation of a gas stream of irregular structure.
  • the means can take the sample from a continuous orifice surrounding the current or from multiple orifices.
  • sampling orifices are preferably oriented so that the gas sampled is directed in the opposite direction to the direction of flow of the current carrying the fibers.
  • the sampling opening (s) surround the gas stream in an annular manner.
  • sampling opening (s) can advance along the path of the gas stream up to a distance which corresponds, as we have seen previously, to a little less than half of the total width of the stream as it would appear in the absence of the device according to the invention.
  • sampling orifices are advantageously preceded by a shaping member conducting the gases.
  • the sampling must be carried out only on the gas stream carrying the fibers. It is necessary to avoid that the sample reaches the surrounding atmosphere which would not have been induced in the current by the drawing gas.
  • the sampling means When the sampling means completely surround the gas stream and in a certain way "channel" it, it is advantageous to ensure that beyond the sampling orifice a partition isolates the current from the surrounding atmosphere.
  • the current is isolated on a part of its course which can be relatively short. It is sufficient that the partition in question prohibits the ascent of ambient air in the sampling device in the opposite direction to the current carrying the fibers.
  • sampling opening are not critical for the intended operation. It is however preferable that the pressure drop in the suction circuit is relatively low to minimize the operating cost, which implies a sufficient opening section.
  • this distance is advantageously of the order of magnitude of the diameter of the wheel.
  • Figure 1 a gas stream of circular cross section. This gas stream is emitted at 0 in an unconfined atmosphere which is only limited by the wall P from which the current is emitted. It progresses by entraining the layers of ambient air with which it comes into contact.
  • the overall gas stream constituted by the magnified initial stream of the induced gases is represented by the limits L.
  • the current lines represented inside the L limits represent only the statistical expression of the flow. Indeed if outside these limits, the induced air experiences a laminar flow, the flow of the enlarged current of the induced air is extremely turbulent.
  • the lines of induced current develop radially in planes substantially parallel to the wall P. They bend at the peripheral limit of the current and then take a direction practically parallel to that of the initial current.
  • Average speeds in a current such as that of FIG. 1 is illustrated in FIG. 2.
  • Average speeds are represented at level N by vectors V whose length is a function of the value of the average speed at the point considered.
  • This speed is highest at the center of the current (V m ) and decreases to the periphery which is arbitrarily set to a value of 0.01 V m .
  • the current in the center is faster because it is not directly braked by contact with the ambient air.
  • the profile represented at level N is reproduced throughout the trajectory with, however, a general and progressive reduction in speeds due to the entrainment of an ever greater mass of gas.
  • the first consequence is of course that the quantity of gas which must be separated from the fibers is all the greater the more the generator of the gas stream is the farther from the receiving member.
  • the phenomenon of entrainment can however be limited if the current comes to be channeled on its course. This is what usually occurs slightly upstream of the receiving member, where the expansion of the gas stream is limited by the walls of a hood.
  • a second effect is the considerable slowing down of the gases.
  • these gases are emitted at speeds of the order of several hundred meters per second to ensure or complete the drawing of the fibers. Such speeds, if they were maintained up to the receiving member would lead to the crushing of the fibers.
  • the initial energy of the current being transferred to a mass of gas (inductive current and induced current) much greater, the speed is of the order of less than ten meters per second.
  • the slowing down of the gases if it avoids the crushing of the fibers must not lead to a backflow.
  • a third effect is the mixture of engine gases and induced gases. This mixture is accompanied by a dispersion of the heat initially contained in the drawing gases and to a much lesser degree in the fibers.
  • the initial temperature of the drawing gases is approximately 1500 ° C.
  • the temperature on the receiving member should ordinarily not exceed one hundred degrees. The induction of air largely contributes to this decrease in temperature.
  • Cooling is traditionally supplemented by spraying water on the gas path.
  • FIG. 3 shows a sampling device according to the invention. This device is generally annular in shape.
  • the gas stream G carrying the fibers passes through the center of this ring.
  • the wall 3 of the inlet 1 of the device forms a conical funnel.
  • a cylindrical sleeve 4 conducts the gases to the outlet 5 of the device.
  • the pipe formed by the wall 3 and the sleeve 4 communicates with an annular suction chamber 6 through the orifice 2 for sampling.
  • This chamber is connected to suction means by pipes not shown.
  • the sampling orifice is formed by the free space separating the sleeve 4 from the cylindrical rim 7 extending the wall 3.
  • the device is arranged so that the flange 7 does not advance beyond the limit L1 ⁇ 2 of speed 1 ⁇ 2 V m relative to the initial current lines, that is to say without taking account of the deformations of these lines due to the presence of the sampling means.
  • the flow of the sampled gas is represented by the arrows A.
  • the sampling is carried out substantially against the flow direction of the current carrying the fibers.
  • the gas leaving the sampling device continues to progress towards the receiving member, not shown. Once out of the sleeve 4 the gas stream again brings in ambient air and its volume increases as indicated above.
  • the sampling orifice 2 is located at a sufficient distance from the outlet 5 of the sleeve 4 so that in the presence of the current G the suction does not cause the ascent of gas from the surrounding atmosphere through this outlet 5.
  • FIG. 4 shows another embodiment of a sampling device according to the invention.
  • the suction chamber 6 is formed by the extension of the sleeve 4.
  • the gas stream is conducted through the pipe 8, the opening 1 of which is flared.
  • the sampling orifice is formed by the free annular space located between the sleeve 4 and the end 10 of the pipe 8.
  • Conduits 9 connect the chamber 6 to the suction means, not shown.
  • FIG. 5 represents a variant of the previous device.
  • This variant is distinguished by the profiled shape given to the end of the pipe 8. This end is in the form of a drop 11 to avoid turbulence at the level of the sampling orifice 2.
  • the sample is taken at two levels.
  • the two sampling orifices are delimited by the concentric elements 7 and 11 on the one hand and 11 and 4 on the other. These orifices communicate respectively with the separate chambers 6 and 12 both connected to suction means by pipes not shown.
  • the suction conditions for the sampled gases A and A 2 may be the same or different. It is also possible, contrary to what is shown in FIG. 6, to have only one suction chamber for two levels of sampling.
  • FIG. 7 schematically shows the overall behavior of the gas streams in an installation for forming fibers by centrifugation from a wheel forming a die and comprising a sampling device according to the invention.
  • the engine gas is emitted at high speed to the periphery of the centrifuge wheel 13 in the form of an annular current.
  • a depression forms and the current gathers to constitute a flow of circular section of reduced dimensions. This phenomenon is materialized very sensitively by the shape of the fiber veil F.
  • the current carries along its path increasing amounts of induced air. This induced air is represented by the current lines I.
  • the gaseous current G increased by the induced air and represented by its limits L passes through a sampling device of the type of that presented in FIG. 3.
  • Part A of the incoming air is sucked into the chamber 6 and evacuated through the pipes 9.
  • the gas not withdrawn leaves the device and continues to progress, inducing new quantities of ambient air.
  • the flow of the gas stream continues as long as it is not confined. Ordinarily this only occurs when the current G meets the walls 15 of the hood. In a way, the walls 15 channel the current to the receiving belt 14 and limit the introduction of induced air.
  • Nozzles 16 spray water onto the gas stream leaving the sampling device.
  • a binder composition is also sprayed by means of nozzles 17.
  • the distribution of water and binder is carried out by means of nozzles distributed all around the gas stream so that the treatment is substantially uniform.
  • the gas stream passes through the receiving mat 14 on which the fibers are retained and form a mattress 17.
  • the box 18 located under the receiving mat is put under vacuum using means not shown through the conduit 19 to allow the passage of gases through the carpet and the mattress being formed. Without suction, the gases from the current would tend to flow out of the hood regardless of the amount of gas carried by the current G.
  • An advantage according to the invention comes from the fact that the quantity of gas to which it is necessary to make cross the receiving belt is less than in the absence of sampling on the current path. Under these conditions, the speed and the pressure drop of the gases when passing through this “filter” are reduced accordingly and this results in less packing of the fibers.
  • the binder composition deposited on the fibers and which is not yet fixed tends to migrate under the effect of the passage of gases. This migration results in a loss of binder in the exhaust gases which requires a corresponding increase in the amount of composition which it is necessary to spray.
  • the gases loaded with binder must undergo pollution reduction which is all the more intense and therefore costly, as they contain more binder. For all these reasons it is advantageous to be able to reduce the speed of passage of the gases and the migration of the binder which depends thereon.
  • Figure 8 shows the evolution of the mattress at different stages of its formation.
  • the fibers are deposited on a conveyor belt 14, of increasing thickness until the outlet of the hood.
  • the mattress 20 is no longer subject to compaction resulting from the passage of gases and relaxes. This relaxation is favored by the tremors due to the mechanisms ensuring transport.
  • the mattress then reaches its greatest thickness e f . It enters the heat treatment enclosure between two movable conformers 21. The spacing of the conformers is substantially smaller than e f .
  • the mattress is thus partially compressed, which has the effect in particular of smoothing its upper surface.
  • the mattress after treatment has a thickness eo corresponding substantially to the spacing of the conformers. It is packaged in the form of rolls or panels in a compressed state. Its thickness in the packaging is e c . This thickness can be as small as a quarter or a fifth of the thickness e o at the end of the heat treatment.
  • the minimum thickness guaranteed to the user or nominal thickness leads to the expression of the compression ratio which by definition is the ratio of the nominal thickness to the thickness under compression e n / O c .
  • the thickness before oven e f is significantly increased.
  • the thickness at the outlet of the treatment may be greater.
  • the compression ratio can then be increased. In other words, the thickness under compression e c can be less (although we start with a thicker product) and consequently the transport and storage costs are reduced by the same amount.
  • suction or intermediate removal naturally entails a certain energy expenditure, but this cost is very largely offset by the advantages obtained which have just been recalled.
  • Another advantage of using the invention appears when, on a given installation, the production characteristics of the fiber-forming device are modified, in particular when by increasing the flow rate of material to be fiberized, the quantity of drawing gas used. is increased. In this case it is possible to increase the speed of travel of the receiving belt to maintain the same density of fibers per unit area, but the speed of the gases passing through the mattress remains greater. This increase in speed results in greater compaction and the various drawbacks which result therefrom.
  • the invention therefore allows better flexibility of use of existing installations.
  • the fiber formation conditions are those traditional for this type of device.
  • the chosen flow corresponds to a daily production of 14 tonnes of fibers (0.16 kg / s).
  • the flow rates are expressed in cubic normometer of air per hour (Nn r Vh), that is to say in equivalent mass of air taken under the conditions of pressure 760 mm of mercury and temperature 0 ° C.
  • the drawing gas stream is composed on the one hand of gas coming from a burner and on the other hand of compressed air. These two components are emitted annularly in the immediate vicinity of the member for centrifuging the material to be stretched.
  • the flow rate of the drawing current formed by these two components is 1300 Nm 3 / h of air (0.47 kg / s).
  • the gas flow rates are measured at the inlet and outlet of the sampling device (or in the absence thereof at the corresponding levels on the gas path) at the level of the receiving member and under this member in the suction boxes.
  • the sampling of a large quantity of gas as is the case in II causes an increase in the quantity of air induced upstream of the sampling. Overall, however, the quantity of gas at the outlet of the sampling device is significantly reduced compared to that which is measured in the absence of sampling.
  • the pressure drop over the mattress from 90 mm of water column (900 Pa) is reduced to 40 mm (400 Pa).
  • the suction required at the level of the box under the receiving belt is much less, which at the same time reduces the air introduced as a result of the device being impermeable at this level 8500 Nm 3 / h of air (3.05 kg / s) instead of 12000 Nm 3 / h of air (4.3 kg / s).
  • the flow rate of the engine gas is 1500 Nm 3 / h.
  • a test is carried out to determine the influence of the invention on the thermal conditions to which the mattress in formation is subjected.
  • the test is carried out with a device of the type shown diagrammatically in FIG. 7.
  • the conditions are those of cases A and C of Example 2.
  • the heat released by the burner introduces into the system an amount of heat of 700,000 kcal / h (813 kW).
  • the ambient air is approximately at 20 ° C.
  • the gas sampled according to the invention is at a measured temperature of 120 ° C. When the sampling is carried out, this eliminates around 160,000 kcal / h (186 kW), or around a quarter of the initial quantity.
  • the amount of water sprayed to cool the gases is the same in both cases. Although the overall amount of induced air is reduced when the sample is taken, there is a drop in temperature of about 10 ° C at the reception.
  • the implementation of the invention increases the flexibility of use of the fiberizing installations.
  • the pressure drop of the gases passing through the mattress being formed is reduced by approximately half, when the sampling according to the invention is carried out. This difference results in less packing of the fibers.
  • the increase in thickness before oven f is about 25% for a device delivering 14 tonnes per day of fibers (0.16 kg / s) and 20% for a rate of 18 tonnes per day (0 , 21 kg / s). This increase could be preserved over the thickness of the mattress at the outlet of the oven and results in an improved compression ratio.
  • the thickness of the compressed mattress in the packaging e c has been significantly reduced while maintaining the same nominal thickness.
  • the gain on the compression ratio, or in volume is 50%. This results in a substantial saving on storage and transport costs.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Nonwoven Fabrics (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Chemical Treatment Of Fibers During Manufacturing Processes (AREA)
  • Inorganic Fibers (AREA)
EP82401429A 1981-08-06 1982-07-30 Procédé et dispositif pour l'amélioration des conditions de formation des matelas de fibres Expired EP0072301B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401429T ATE14460T1 (de) 1981-08-06 1982-07-30 Verfahren und vorrichtung zur verbesserung der bildungsverhaeltnisse bei fasermatrazen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8115283A FR2511051A1 (fr) 1981-08-06 1981-08-06 Procede et dispositif pour l'amelioration des conditions de formation de matelas de fibres
FR8115283 1981-08-06

Publications (2)

Publication Number Publication Date
EP0072301A1 EP0072301A1 (fr) 1983-02-16
EP0072301B1 true EP0072301B1 (fr) 1985-07-24

Family

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EP82401429A Expired EP0072301B1 (fr) 1981-08-06 1982-07-30 Procédé et dispositif pour l'amélioration des conditions de formation des matelas de fibres

Country Status (23)

Country Link
US (1) US4744810A (fi)
EP (1) EP0072301B1 (fi)
JP (1) JPS5876563A (fi)
KR (1) KR880000382B1 (fi)
AR (1) AR228406A1 (fi)
AT (1) ATE14460T1 (fi)
AU (1) AU8653182A (fi)
BR (1) BR8204604A (fi)
CA (1) CA1192013A (fi)
DE (1) DE3264903D1 (fi)
DK (1) DK339082A (fi)
ES (1) ES8305072A1 (fi)
FI (1) FI822724L (fi)
FR (1) FR2511051A1 (fi)
GR (1) GR77263B (fi)
IE (1) IE53073B1 (fi)
IN (1) IN156642B (fi)
MX (1) MX156459A (fi)
NO (1) NO822684L (fi)
NZ (1) NZ201270A (fi)
PT (1) PT75378B (fi)
TR (1) TR21349A (fi)
ZA (1) ZA825369B (fi)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2511051A1 (fr) * 1981-08-06 1983-02-11 Saint Gobain Isover Procede et dispositif pour l'amelioration des conditions de formation de matelas de fibres
FI831344L (fi) * 1983-04-20 1984-10-21 Yhtyneet Paperitehtaat Oy Fiberfoerdelningsfoerfarande och - anordning foer en torrpappermaskin.
FR2559793B1 (fr) * 1984-02-17 1986-12-19 Saint Gobain Isover Procede de production de matelas de fibres minerales a partir d'un materiau fondu
DE3807420A1 (de) * 1988-03-07 1989-09-21 Gruenzweig & Hartmann Einrichtung zur erzeugung von fasern, insbesondere mineralfasern, aus einer schmelze
US5324337A (en) * 1992-12-29 1994-06-28 Knauf Fiber Glass Gmbh Method for producing fiber product
US5455991A (en) * 1994-02-03 1995-10-10 Schuller International, Inc. Method and apparatus for collecting fibers, and product
EP0760028B1 (en) * 1994-05-02 1999-06-02 Owens Corning Wool pack forming process using high speed rotating drums and low frequency sound distribution
US5595585A (en) 1994-05-02 1997-01-21 Owens Corning Fiberglas Technology, Inc. Low frequency sound distribution of rotary fiberizer veils
WO1995030787A1 (en) * 1994-05-10 1995-11-16 Owens Corning Direct forming method of collecting long wool fibers
WO1995032859A1 (en) * 1994-05-26 1995-12-07 Beck Martin H Polyester insulation
US5980680A (en) * 1994-09-21 1999-11-09 Owens Corning Fiberglas Technology, Inc. Method of forming an insulation product
US5885390A (en) * 1994-09-21 1999-03-23 Owens-Corning Fiberglas Technology Inc. Processing methods and products for irregularly shaped bicomponent glass fibers
DE10322460B4 (de) * 2003-05-16 2007-02-08 Corovin Gmbh Verfahren und Vorrichtung zur Herstellung eines Spinnvlieses aus Filamenten aus aufgeplatzten Fasern, Filamente aus aufgeplatzen Fasern und Vliesstoff
US20060021503A1 (en) * 2004-07-30 2006-02-02 Caterpillar, Inc. Electrostatic precipitator particulate trap with impingement filtering element
US20070014995A1 (en) * 2005-07-12 2007-01-18 Jacob Chacko Thin rotary-fiberized glass insulation and process for producing same

Family Cites Families (18)

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Publication number Priority date Publication date Assignee Title
GB517072A (en) * 1937-07-14 1940-01-19 Mij Exploitatie Octrooien Nv Improvements in filter materials and the manufacture thereof
US3442633A (en) * 1964-01-02 1969-05-06 Walter Merton Perry Method and apparatus for conveying and for treating glass fibers
US3325906A (en) * 1965-02-10 1967-06-20 Du Pont Process and apparatus for conveying continuous filaments
DE1635596B2 (de) * 1967-04-11 1975-02-20 E.I. Du Pont De Nemours And Co., Wilmington, Del. (V.St.A.) FadenabzugsdOse zur Verwendung bei der Faservlies-Herstellung
US3824086A (en) * 1972-03-02 1974-07-16 W M Perry By-pass fiber collection system
US3781047A (en) * 1972-03-31 1973-12-25 Emhart Corp Adjustable support
US3877911A (en) * 1972-09-13 1975-04-15 Owens Corning Fiberglass Corp Method and apparatus for producing fibers
FR2368445A1 (fr) * 1976-10-22 1978-05-19 Saint Gobain Regulation des installations de fibrage avec traitement des effluents
US4111672A (en) * 1973-10-10 1978-09-05 Saint-Gobain Industries Method and apparatus for suppression of pollution in mineral fiber manufacture
FR2286772A1 (fr) * 1974-10-03 1976-04-30 Etpm Installation de manutention pneumatique
DE2627262C3 (de) * 1976-06-18 1978-11-30 Automatik Apparate-Maschinenbau H. Hench Gmbh, 8754 Grossostheim Vorrichtung zum Trocknen von durch ein strömendes Gas transportierten Feststoffen
SU746015A1 (ru) * 1977-12-27 1980-07-07 Всесоюзное научно-производственное объединение целлюлозно-бумажной промышленности Устройство дл преобразовани потока аэровзвеси волокон
GB1601801A (en) * 1978-05-11 1981-11-04 Wiggins Teape Group Ltd Feeding means for a rod like element
US4263007A (en) * 1978-06-05 1981-04-21 Saint-Gobain Industries Apparatus for heat treatment of fibrous mats
US4263241A (en) * 1978-11-03 1981-04-21 Alexandrov Vyacheslav S Method for production of fibrous sheet material and apparatus for carrying out the same
US4350482A (en) * 1978-11-03 1982-09-21 Alexandrov Vyacheslav S Apparatus for production of fibrous sheet material
SU787537A1 (ru) * 1979-02-01 1980-12-15 Всесоюзное научно-производственное объединение целлюлозно-бумажной промышленности Устройство дл преобразовани потока аэровзвеси волокон
FR2511051A1 (fr) * 1981-08-06 1983-02-11 Saint Gobain Isover Procede et dispositif pour l'amelioration des conditions de formation de matelas de fibres

Also Published As

Publication number Publication date
KR840001285A (ko) 1984-04-30
CA1192013A (en) 1985-08-20
DK339082A (da) 1983-02-07
ES514745A0 (es) 1983-04-16
US4744810A (en) 1988-05-17
PT75378A (fr) 1982-09-01
NZ201270A (en) 1986-01-24
NO822684L (no) 1983-02-07
AR228406A1 (es) 1983-02-28
FR2511051B1 (fi) 1984-03-23
ZA825369B (en) 1983-05-25
PT75378B (fr) 1985-01-03
FI822724L (fi) 1983-02-07
EP0072301A1 (fr) 1983-02-16
FR2511051A1 (fr) 1983-02-11
TR21349A (fi) 1984-03-01
JPS5876563A (ja) 1983-05-09
MX156459A (es) 1988-08-24
ATE14460T1 (de) 1985-08-15
AU8653182A (en) 1983-02-10
IE53073B1 (en) 1988-05-25
GR77263B (fi) 1984-09-11
IE821890L (en) 1983-02-06
ES8305072A1 (es) 1983-04-16
FI822724A0 (fi) 1982-08-05
IN156642B (fi) 1985-09-28
BR8204604A (pt) 1983-07-26
KR880000382B1 (ko) 1988-03-20
DE3264903D1 (en) 1985-08-29

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