EP0118369B1 - Perfectionnements aux techniques de formation de feutres de fibres - Google Patents

Perfectionnements aux techniques de formation de feutres de fibres Download PDF

Info

Publication number
EP0118369B1
EP0118369B1 EP84400453A EP84400453A EP0118369B1 EP 0118369 B1 EP0118369 B1 EP 0118369B1 EP 84400453 A EP84400453 A EP 84400453A EP 84400453 A EP84400453 A EP 84400453A EP 0118369 B1 EP0118369 B1 EP 0118369B1
Authority
EP
European Patent Office
Prior art keywords
felt
fibres
conveyor
fibers
unit
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
EP84400453A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0118369A1 (fr
Inventor
Henri Lemaignen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Gobain Isover SA France
Original Assignee
Saint Gobain Isover SA France
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Saint Gobain Isover SA France filed Critical Saint Gobain Isover SA France
Priority to AT84400453T priority Critical patent/ATE31948T1/de
Publication of EP0118369A1 publication Critical patent/EP0118369A1/fr
Application granted granted Critical
Publication of EP0118369B1 publication Critical patent/EP0118369B1/fr
Expired legal-status Critical Current

Links

Images

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
    • D04H1/04—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres
    • D04H1/08—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres and hardened by felting; Felts or felted products
    • 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
    • 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
    • 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
    • D04H1/42—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
    • D04H17/00—Felting apparatus
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D04H3/03—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments at random

Definitions

  • the invention relates to improvements made to the techniques for forming felts, and in particular thick felts such as those intended for thermal and acoustic insulation.
  • the formation of felts from fibers carried by a gas stream is carried out by passing this gas stream through a perforated receiving conveyor which retains the fibers. to fix the fibers together, a binder is sprayed on the fibers during their trajectory towards the receiving conveyor. This binder is then hardened, for example by a heat treatment.
  • the gas stream carrying the fibers ordinarily has a section of a limited magnitude which is a function, in particular, of the device for producing the fibers. Also the gas stream usually does not cover the entire width of the conveyor and the fibers do not distribute evenly.
  • the fibers are deposited over the entire width of the conveyor.
  • the invention aims to provide an improved technique for the distribution of fibers in the felts formed.
  • the object of the invention in particular is to enable the correction of variations in distribution which appear during operation.
  • the invention also aims to ensure that the correction of variations in the distribution of fibers is carried out automatically.
  • a fiber production assembly generating a gas stream carrying the fibers in a receiving enclosure, a gas permeable conveyor forming a wall. of this enclosure, the conveyor allowing the gases to pass and retaining the fibers which constitute the felt, a device giving the gaseous current an oscillating movement across the width of the conveyor, an assembly for treating the felt leaving the receiving enclosure , the device imparting the oscillating movement to the gas current being constituted by a guide duct set in motion by motor means, characterized in that the movement being modifiable at least in amplitude, continuously and instantaneously according to instructions developed by a set of regulation comprising a set of measurements of the mass of fibers per unit area on the felt formed, a po calculator ur the processing of the measurements and the comparison of the result of this processing with the quantities of instructions stored in memory, and developing signals controlling the means 9 setting in motion the guide duct.
  • the felt-forming installation of FIG. 1 comprises a device for forming fibers, a receiving assembly and distribution means.
  • the forming device is of the type in which the material to be fiberized is projected in the form of fine filaments out of a centrifuge having a multitude of orifices.
  • the filaments are still entrained and stretched by a gas stream directed vertically from top to bottom.
  • the gas stream is at high temperature, which allows the filaments to be kept in the conditions suitable for drawing.
  • the fibers entrained by the gas stream form a kind of veil 2 around and above the centrifuge 1.
  • the invention is not limited to a particular mode of fiber formation. On the contrary, it encompasses all the techniques in which a fiber felt is made from fibers conveyed by a gas stream. The example of fiber formation by this centrifugation technique was chosen because it is of great industrial importance.
  • the veil of fibers tightens under the centrifuge for reasons which relate to the geometry of the fiberizing device. Then, in contact with the ambient atmosphere, the gas stream carrying the fibers expands.
  • the gas stream carrying the fibers is directed into an enclosure 4, the base of which is constituted by a conveyor 3. This enclosure is closed laterally so that the gaseous stream cannot be removed other than by passing through the perforated conveyor 3.
  • walls 5 channel the gas flow. As shown in FIG. 1, these can be mobile walls. These walls have the advantage of being able to be continuously rid of fibers which could become undesirably attached to them, and this all the more easily if the fibers have received a binder composition by spraying on their path towards the conveyor. The spray assembly is not shown.
  • the box 6 is arranged so that the suction takes place over the entire width of the conveyor 3. This avoids the formation of undesirable turbulence in the enclosure 4. To a certain extent, the uniform suction also promotes a regular distribution of the fibers, the areas of the conveyor already loaded with fibers having a higher resistance to the passage of gases which prevents the accumulation of additional fibers.
  • an oscillating guide duct 8 is arranged on the path of the gas stream.
  • the current is channeled through the conduit 8 whose dimensions are such that its swing deflects the current forcing it to sweep the entire width of the conveyor 3.
  • the guide duct 8 is placed at the top of the enclosure 4, as far as possible from the conveyor so that the changes in direction to be imparted to the gas stream are as small as possible.
  • Figure 2 shows in more detail the guide duct 8 and the mechanism which drives it in an arrangement according to the invention.
  • the movement of the gas flow guide duct is provided by a motor and a mechanical transmission comprising a cam and a set of connecting rods.
  • Improvements have been proposed which involve a mechanism formed by a series of gears, the assembly having the effect of producing a more complex movement of the duct.
  • This movement includes, for example, a greater speed of movement in the extreme positions than in the middle position.
  • the device used according to the invention allows on the contrary modifications of the operating conditions without requiring an interruption of the production or even without disturbing it. For this reason, these modifications can be as frequent as desired. It is also possible to envisage the correction of even relatively small distribution defects and to achieve products of appreciably increased quality.
  • the guide duct has at its upper part a slightly frustoconical shape flared towards the fiber forming device. This flared shape facilitates the channeling of the drawing gases emitted by an annular drawing member 10 at the periphery of the centrifuge 1.
  • the conduit 8 is supported by means of two pivots 11 engaged on bearings fixed on uprights not shown.
  • the axis of rotation is placed high enough on the duct so that the arrangement of the opening thereof vis-à-vis the gas stream is little modified by the oscillation movement.
  • the movement is generated by an engine assembly which in the example shown is constituted by hydraulic cylinder 9.
  • This drive mode is obviously not the only one usable. It is possible to provide for example an electrical or electromechanical assembly making it possible to ensure both the oscillation movement of the conduit 8 and the modification of the parameters defining this movement.
  • the movement is communicated to the conduit 8 via an articulated mechanical transmission comprising the rod 16 of the jack 9, an arm 14, a connecting rod 13 and another arm 12 integral with the conduit 8.
  • the arm 14 pivots on an axis 15 carried by bearings arranged on a fixed frame, not shown.
  • the rod 16 of the jack 9 is attached to the arm 14 by an articulation 22.
  • the jack 9 is held on a frame 26 by means of pivots 27 which allow it a certain rotation travel in a vertical plane.
  • the connecting rod 13 articulated on the arms 12 and 14, in the form shown, constitutes with these arms a deformable parallelogram.
  • the movement of the two arms is therefore identical.
  • Other similar arrangements are obviously possible in the context of the invention.
  • This arrangement has the advantage of simplifying the determination of the position of the conduit 8, a determination which, as we will see later, is involved in the regulation according to the invention.
  • the movement transmission assembly has a whole series of adjustment means making it possible to fix its geometry with precision. These traditional means for this type of assembly are not represented.
  • the jack 9 is double acting. It can therefore be animated by an alternating movement back and forth. Such a movement can also be obtained using two simple counter cylinders, but for the convenience of implementation a double cylinder is preferable.
  • the operation of the jack 9 is controlled by a proportional distributor shown diagrammatically at 17.
  • the latter regulates the flow rate of the fluid admitted into the jack. It is associated with a hydraulic power station supplying the pressurized fluid, shown diagrammatically by block 28.
  • the stroke of the jack 9 and the construction of the mechanical transmission are chosen so that the swinging of the guide duct 8 can meet all practical needs.
  • the limits of the movement materialized for example in FIG. 1 by the angle B formed by the axis of the conduit in the extreme positions, are such that the gas stream would exceed the width of the conveyor if it did not collide at the side walls 5.
  • the movement that can be made to the cylinder 9, and therefore communicate to the guide duct 8, can follow any instruction. It is possible for example to make the cylinder follow a walking program in which the speed would vary during an oscillation according to a complex law. It is also possible, of course, to combine variations of several of the parameters determining movement, speed, frequency, amplitude, extreme positions.
  • the hydraulic cylinder constitutes a preferred means according to the invention because of its robustness and its flexibility of use. Other means can also be used to produce this type of variable movement as we indicated above.
  • the dispensing device used according to the invention therefore lends itself to frequent corrections to the dispensing method such that these may appear necessary in the production of felts.
  • the dispersion of the fibers on the conveyor is subject to many hazards. It is understood that it is very difficult to keep the flows inside the enclosure 4 perfectly stable. In addition to the current carrying the fibers, large induced currents develop. In addition, in the same enclosure are usually assembled several fiber-forming devices, the gas streams of which do not fail to influence one another. As a result and despite the suction established under the conveyor, the enclosure 4 is the seat of significant turbulence. To these causes of irregularities is added, if necessary, an accidental lack of uniformity in the aspiration.
  • Another advantage of the use, according to the invention, of hydraulic means for actuating the guide duct is to allow automated control. Indeed, the variations discussed above occur by chance. It is therefore very desirable that corrections can take place as soon as a distribution fault is detected.
  • the fiber distribution measurements in the felt formed can be established by different methods. In the perspective of automatic regulation, the methods that can be used must operate continuously and not disturb production.
  • a preferred method is constituted by a measurement of absorption of radiations, in particular of X-rays, but other methods are also possible.
  • the measurement of X-ray absorption is preferred when the felt is thick, in other words when the absorption is relatively strong.
  • layers of fibers such as those of products of the type designated by the name of "veil"
  • a measurement carried out with beta radiation may be preferred.
  • the measurement of the mass of fibers per unit area on the felt by absorption of X-rays is carried out according to the invention according to very specific methods.
  • the measuring device must be located at a point in the production chain which lends itself to significant measurement.
  • the felt formed is often charged with moisture. This comes in particular from the binder solution sprayed on the fibers.
  • water is also sprayed on the path of the fibers to cool the drawing gases and the fibers which they transport. Water that strongly absorbs X-rays can significantly modify the results of the measurements, if its distribution is not homogeneous. It is therefore advantageous to operate at a point in the production chain where the felt is rid of its moisture.
  • the measurement of fiber mass per unit area is preferably located at the outlet of the binder treatment chamber.
  • the measurement can be made before treatment, as soon as they leave the fiber reception enclosure.
  • the regulation according to the invention makes it possible to correct distribution defects which manifest themselves over relatively long periods with respect to the delay in question.
  • irregularities usually appear gradually. If they are corrected as they appear, the deviations found are usually relatively small and do not compromise production.
  • the measurements must also be made over the entire width of the felt, a mobile measuring device is used for this purpose which moves transversely to the felt.
  • Figure 3 shows schematically a measuring device used according to the invention.
  • the felt 7 passes through a frame 29.
  • the frame 29 supports in the upper transverse a source 30 emitting radiation in the direction of the felt 7.
  • the emitting source 30 disposed on bearings is mobile. Its transverse movements are provided by a chain system arranged in the frame but not shown.
  • a mobile receiver 31 is arranged opposite the source.
  • the receiver is driven in a movement identical to that of the source, also by a chain system.
  • a single motor assembly housed in the housing 32 ensures perfectly synchronized movement of the source 30 and the receiver 31.
  • the emitted radiation is partially absorbed by the felt and the fraction of the radiation reaching the receiver is measured.
  • the measurements are taken while the device is moving and each corresponds to the scanning of a fraction of the width of the felt.
  • the duration of each measure, and by Consequently, the width of the fraction analyzed can be chosen according to the use made of these measurements.
  • the measurements must be carried out on fractions of the width of the felt such that the discontinuous structure of the fibrous material does not constitute an obstacle to obtaining significant values.
  • the minimum width of the "sample” on which the measurement is made is a function of the mass per unit area of the felt. It is all the smaller the denser the felt.
  • the regulation mode of the felt-forming installation for the part relating to the distribution of the fibers, is shown diagrammatically in FIG. 4.
  • each of them is advantageously equipped with a distribution system of the type used according to the invention.
  • the movement of these devices may or may not be identical. In general, they have a movement of the same frequency but this is not necessary, the movements may not be synchronized.
  • the amplitude and middle direction settings may vary from device to device.
  • this can relate to one or more devices of the same installation.
  • the felt 7 leaving the enclosure 4 is taken up by the conveyor 20 running at the same speed as the conveyor 3. It passes through an oven 19 where it is subjected to a circulation of hot air to polymerize the binder.
  • the dry felt passes through the measuring device by absorption of the X-rays 21.
  • the regulatory loop implemented is as follows.
  • the measuring device 21 transmits the quantities corresponding to the absorption for the "sample” analyzed as well as the position of this sample on the felt to a computer shown diagrammatically at 23.
  • the computer 23 also receives information on the operation of the distribution device via the regulation assembly represented by the block 24.
  • the computer receives the signals concerning the position of the guide duct 8. This position is identified for example by means of a potentiometric detector 18 (FIG. 2) which follows the rotational movement of the arm 14 around the axis 15.
  • the computer 23 also receives the information relating to the speed of movement of the felt 7, by means of a system for regulating the speed of the conveyors shown diagrammatically by the block 25.
  • the computer compares this information with a set of data in memory and, according to the deviations observed, develops instructions which are sent to the regulating assemblies 24 and 25. These assemblies consequently modify the operation of the distribution device and the speed of the conveyors.
  • the running speed of the conveyors makes it possible to modify the mass per unit area of the fibers in general but not the transverse distribution. Ordinarily, the overall quantity of fibers is controlled at the time when these fibers are formed, for example by regulating the quantity of material to be fiberized. In this hypothesis, the running speed remains constant.
  • the presence of a mass measurement unit per unit area of the felt allows, if necessary, an automatic speed adjustment as indicated above.
  • the computer 23 is led to integrate the local measurements in order to determine the mass per unit area of the entire felt.
  • the comparison of the result with an imposed value controls the acceleration or the deceleration of the conveyors according to whether this mass appears higher or lower than the imposed value.
  • the parameters which determine the running of the distribution duct 8 and therefore the transverse distribution of the fibers are the frequency of the oscillations, the amplitude of the oscillating movement and the middle direction.
  • the frequency is an important element to obtain a good distribution of the fibers on the conveyor.
  • several successive deposits are usually superimposed, each corresponding to a device from a series of aligned devices as mentioned above.
  • the influence of the frequency, above a relatively low minimum threshold is less sensitive.
  • the precise setting of the frequency is much more important for the final result.
  • the frequency must be sufficient for the entire surface of the moving conveyor to be effectively covered by the flow carrying the fibers.
  • complete covering by each of the flows is not always essential. It suffices that the overall effect of these devices effectively corresponds to complete recovery.
  • Frequency regulation can then be carried out in combination with the adjustment of the conveyor running speed as a function of the average surface mass measured over the entire width of the felt.
  • the amplitude and the middle direction of movement of the guide duct directly determine the transverse distribution of the fibers.
  • the use of guide conduits in traditional modes has made it possible to obtain simple results on the way in which these parameters act on the distribution.
  • the modification of the middle direction causes a displacement of the deposit of the fibers in the same direction as this modification. Given the presence of the side walls, this displacement results in fact in an increase in the mass of fibers per unit area on the side towards which the displacement takes place.
  • an increase in the amplitude of the movement favors the deposition of the fibers on the edges of the conveyor to the detriment of the center and vice versa.
  • the fiber mass measurements per unit area and their processing by the computer are in particular aimed at achieving the best possible adjustment of these two parameters.
  • distribution models have been established, to which correspond responses, the whole being stored in the calculator.
  • FIGS. 5a, 5b, 5c and 5d Four basic distributions are distinguished. These four distributions are shown diagrammatically in FIGS. 5a, 5b, 5c and 5d. In these figures the difference in mass per unit area is indicated relative to the average value on a cross section of the felt. For the average value, the difference is zero. These four shapes correspond respectively: to the gas current shifted to the left (Figure 5a), shifted to the right ( Figure 5b), to an amplitude of oscillation that is too large (Figure 5c) or too small (Figure 5d).
  • the processing of the measurement initially comprises the accumulation of several measurements corresponding to successive passages at the same location in the width of the felt.
  • the average value deduced from it is thus a more complete and more precise image of the actual distribution in the area considered.
  • the measures are also grouped by sectors, which are weighted. The choice of sectors and their respective weighting is determined by tests to ensure that the values obtained are well representative of the distribution and that the resulting corrections result in an effective improvement.
  • FIG. 6 a preferred grouping mode for the measurements of the masses of fibers per unit of area is indicated.
  • this mode for example, the width of the felt L is cut into four sectors which partially overlap.
  • the weighted measures grouped in these four sectors make it possible to avoid giving too great importance to the measures corresponding to the sides of the felt relative to the central part.
  • the fiber-forming device as well as the assembly of the guide duct and the motor system, is of the type shown in FIG. 2.
  • the felt formed has a width of 2.40 m. It has a mass per unit area of 1 kg / m2.
  • the speed of the receiving conveyor is relatively slow. It is 5.25 m / min.
  • the felt Scrolls through an X-ray absorption measurement assembly whose source is americium 241.
  • This mobile source traverses the entire width of the felt in 32 s.
  • measurements are made. The values are saved with their location.
  • a rolling average is established over the last eight passes of the X-ray probe.
  • the regulation is based on the average values for these four bands according to the mode described above.
  • this period is 10 minutes. It is also necessary to consider the time corresponding to at least eight successive passages of the probe on the felt formed after the previous correction to have all of the eight measurements that we have set.
  • Figure 7 shows the evolution of the distribution of fibers on a side strip of felt of a width of 30 cm. The corresponding value is therefore the average of eight measurements for each of the eight successive passages, for a total of 64 measurements.
  • the graph represents the relative difference in density of the strip considered with respect to the average basis weight over the entire width of the felt.
  • the timing of corrections is indicated by a vertical bar.
  • the initial movement of the guide duct corresponds to an amplitude defined by the half-angle B of 8.7 ° and a median direction making an angle of + 0.8 ° relative to the vertical.
  • the oscillation frequency which remains unchanged during the tests is 60 round trips per minute.
  • the correction introduced according to the invention is an extremely precise operation as we indicated at the beginning of the description.
  • the amplitude of the movement of the guide duct is 8.14 ° and the middle direction makes an angle of -0.5 ° relative to the vertical.
  • the modifications imposed on the movement are therefore very slight.
  • FIG. 8 also reproduces a regulation test on the same device as above.
  • the average surface mass is 1.3 kg / m 2 .
  • the half angle B defining the amplitude of the movement is 12.35 ° and the offset from the vertical is - 10.61 °.
  • Corrections are indicated on the time scale by a vertical bar.
  • the half angle B is 12.72 ° and the middle direction - 10.25 °.
  • the variations leading to the improvement of the distribution of the fibers are therefore extremely small.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Nonwoven Fabrics (AREA)
  • Reinforced Plastic Materials (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
EP84400453A 1983-03-10 1984-03-07 Perfectionnements aux techniques de formation de feutres de fibres Expired EP0118369B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400453T ATE31948T1 (de) 1983-03-10 1984-03-07 Verfahren zur erzeugung von faserfilzen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8303919A FR2542336B1 (fr) 1983-03-10 1983-03-10 Perfectionnements aux techniques de formation de feutres de fibres
FR8303919 1983-03-10

Publications (2)

Publication Number Publication Date
EP0118369A1 EP0118369A1 (fr) 1984-09-12
EP0118369B1 true EP0118369B1 (fr) 1988-01-13

Family

ID=9286692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400453A Expired EP0118369B1 (fr) 1983-03-10 1984-03-07 Perfectionnements aux techniques de formation de feutres de fibres

Country Status (26)

Country Link
US (1) US4592769A (tr)
EP (1) EP0118369B1 (tr)
JP (1) JPS59199855A (tr)
KR (1) KR920000959B1 (tr)
AR (1) AR231315A1 (tr)
AT (1) ATE31948T1 (tr)
AU (1) AU2518384A (tr)
BR (1) BR8401091A (tr)
CA (1) CA1220623A (tr)
DE (1) DE3468708D1 (tr)
DK (1) DK161342C (tr)
EG (1) EG16654A (tr)
ES (1) ES8500360A1 (tr)
FI (1) FI77901B (tr)
FR (1) FR2542336B1 (tr)
GR (1) GR79517B (tr)
IE (1) IE55015B1 (tr)
IL (1) IL71312A (tr)
MA (1) MA20057A1 (tr)
MX (1) MX157904A (tr)
NO (1) NO160306C (tr)
NZ (1) NZ207438A (tr)
PT (1) PT78217B (tr)
TR (1) TR22124A (tr)
YU (1) YU43346B (tr)
ZA (1) ZA841706B (tr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5034181A (en) * 1989-09-27 1991-07-23 Process First, Inc. Apparatus for and method of manufacturing preforms
FI85688C (sv) * 1990-06-13 1992-05-25 Partek Ab Förfarande för att vid mineralfiberframställning reglera en viktrelate rad parameter hos en mineralfiberbana
ZA92308B (en) 1991-09-11 1992-10-28 Kimberly Clark Co Thin absorbent article having rapid uptake of liquid
DK126593D0 (da) * 1993-11-08 1993-11-08 Rockwool Int Mineral wool
US5595585A (en) * 1994-05-02 1997-01-21 Owens Corning Fiberglas Technology, Inc. Low frequency sound distribution of rotary fiberizer veils
US5605556A (en) * 1995-03-31 1997-02-25 Owens-Corning Fiberglas Technology Inc. Linear ramped air lapper for fibrous material
US5603743A (en) * 1995-03-31 1997-02-18 Owens-Corning Fiberglas Technology Inc. High frequency air lapper for fibrous material
US6776013B2 (en) * 2002-10-30 2004-08-17 Certainteed Corporation Aerodynamic mineral wool forming bucket
DE102004011690A1 (de) * 2004-03-10 2005-09-29 Saint-Gobain Isover G+H Ag Vorrichtung zur flächigen Ablage von Fasermaterial, insbesondere Mineralfasermaterial
US20060135017A1 (en) * 2004-12-16 2006-06-22 Jeng Lin Continuous filament mat and method of making
US7147634B2 (en) * 2005-05-12 2006-12-12 Orion Industries, Ltd. Electrosurgical electrode and method of manufacturing same
FR2901023B1 (fr) 2006-05-10 2008-07-04 Saint Gobain Isover Sa Methode de detection des defauts localises presents dans un matelas de fibres minerales
JP4783218B2 (ja) * 2006-06-15 2011-09-28 旭ファイバーグラス株式会社 繊維状物の分布方法及び分布装置
JP5021444B2 (ja) * 2007-12-14 2012-09-05 旭ファイバーグラス株式会社 繊維状物の集積方法及び集積装置
EP2248777B1 (en) * 2008-02-18 2013-01-09 Asahi Fiber Glass Company, Limited Method of and device for collecting fibrous materials
FR3052762B1 (fr) * 2016-06-17 2020-09-25 Saint Gobain Isover Installation de traitement d'un matelas de fibres minerales par detection et evacuation de defauts localises, et procede correspondant

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3134145A (en) * 1962-01-26 1964-05-26 Owens Corning Fiberglass Corp Apparatus for forming fibrous blankets
US3539316A (en) * 1967-07-25 1970-11-10 Owens Corning Fiberglass Corp Method and apparatus for manufacturing fibrous structures
US3546898A (en) * 1967-12-28 1970-12-15 Owens Corning Fiberglass Corp Nonuniform motion producing structure for producing fibrous mats
US3826903A (en) * 1972-01-03 1974-07-30 Owens Corning Fiberglass Corp Method and apparatus for control of conditions in a process
US4046538A (en) * 1976-04-19 1977-09-06 Owens-Corning Fiberglas Corporation Oscillating mechanism and method of and means for promoting motion accuracy of the mechanism in a fiber forming operation
US4168959A (en) * 1977-02-16 1979-09-25 Johns-Manville Corporation Method and apparatus for distribution of glass fibers
US4210432A (en) * 1978-07-03 1980-07-01 Rockwool Aktiebolaget Method for control of the surface weight of a mineral wool mat
US4263033A (en) * 1979-12-26 1981-04-21 Owens-Corning Fiberglas Corporation Method and apparatus for collecting mineral fibers

Also Published As

Publication number Publication date
ATE31948T1 (de) 1988-01-15
EG16654A (en) 1991-08-30
PT78217A (fr) 1984-04-01
CA1220623A (fr) 1987-04-21
TR22124A (tr) 1986-04-30
US4592769A (en) 1986-06-03
DK142884A (da) 1984-09-11
NO840868L (no) 1984-09-11
AU2518384A (en) 1984-09-27
GR79517B (tr) 1984-10-30
YU42184A (en) 1987-02-28
DK142884D0 (da) 1984-02-29
JPS59199855A (ja) 1984-11-13
MX157904A (es) 1988-12-20
IE840557L (en) 1984-09-10
DK161342B (da) 1991-06-24
EP0118369A1 (fr) 1984-09-12
KR840007915A (ko) 1984-12-11
NZ207438A (en) 1986-12-05
FI840976A (fi) 1984-09-11
DE3468708D1 (en) 1988-02-18
BR8401091A (pt) 1984-10-16
FR2542336A1 (fr) 1984-09-14
AR231315A1 (es) 1984-10-31
IL71312A (en) 1988-07-31
FI77901B (fi) 1989-01-31
PT78217B (fr) 1986-04-23
FI840976A0 (fi) 1984-03-09
ZA841706B (en) 1984-11-28
FR2542336B1 (fr) 1985-11-29
ES530457A0 (es) 1984-11-01
IE55015B1 (en) 1990-04-25
ES8500360A1 (es) 1984-11-01
NO160306C (no) 1989-04-05
KR920000959B1 (ko) 1992-01-31
DK161342C (da) 1991-12-02
MA20057A1 (fr) 1984-10-01
YU43346B (en) 1989-06-30
NO160306B (no) 1988-12-27

Similar Documents

Publication Publication Date Title
EP0118369B1 (fr) Perfectionnements aux techniques de formation de feutres de fibres
CA2020070C (fr) Procede et dispositif de reception de fibres minerales
FR2540352A1 (fr) Procede et dispositif pour confectionner des produits en forme de batonnets de l'industrie de transformation du tabac
EP0125963B1 (fr) Perfectionnements aux dispositifs pour la formation de feutres de fibres
CA1221514A (fr) Techniques de formation de fibres comprenant une centrifugation
EP0388287B1 (fr) Substrat pour culture hors-sol
FR2557156A1 (fr) Procede et dispositif de formation reguliere d'une nappe de fibres dans la zone de formation de la nappe comprise entre le tambour et l'organe de prise en charge des fibres
EP0091381A1 (fr) Perfectionnements aux techniques de formation de fibres par centrifugation et étirage gazeux
WO2002070798A1 (fr) Systeme de gestion automatisee de l'etalement d'une nappe textile
CA2969286C (fr) Procede de mesure a l'interieur d'un matelas de fibres minerales ou vegetales
EP0083543A1 (fr) Procédé et dispositif pour la formation de voiles de fibres
CA1208913A (fr) Amelioration de la repartition de fibres dans un feutre
FR2556568A1 (fr) Procede de fabrication de cigarettes et machine de commande de distribution de tabac a brins courts, notamment avec un pourcentage preregle de tabac a brins courts et de tabac a brins longs
EP2167446A2 (fr) Procede de compostage a sonde mobile et dispositif correspondant
FR2529878A1 (fr) Perfectionnements aux techniques de formation de fibres comprenant une centrifugation
FR2546196A1 (fr) Procede et installation de reglage d'un defibreur
BE894826A (fr) Procede et appareil pour la fabrication de torons coupes et comprimes
WO2022185010A1 (fr) Installation de fabrication de laine minerale
EP3652525B1 (fr) Procede de quantification de l'humidite dans un matelas de fibres
BE387030A (tr)
BE363446A (tr)
BE899636A (fr) Procede et installation de reglage d'un defibreur.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19840929

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19880113

REF Corresponds to:

Ref document number: 31948

Country of ref document: AT

Date of ref document: 19880115

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3468708

Country of ref document: DE

Date of ref document: 19880218

ITF It: translation for a ep patent filed

Owner name: DR. ING. A. RACHELI & C.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19900323

Year of fee payment: 7

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19910331

Ref country code: CH

Effective date: 19910331

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19940331

Year of fee payment: 11

EPTA Lu: last paid annual fee
EAL Se: european patent in force in sweden

Ref document number: 84400453.1

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19950307

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19980217

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19980305

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19980307

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19980310

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19980326

Year of fee payment: 15

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990307

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990308

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990331

BERE Be: lapsed

Owner name: ISOVER SAINT-GOBAIN

Effective date: 19990331

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19990307

EUG Se: european patent has lapsed

Ref document number: 84400453.1

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19991130

EUG Se: european patent has lapsed

Ref document number: 84400453.1

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000101

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20020312

Year of fee payment: 19

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031001

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20031001