FI62526C - PROCESSING OF ORGANIZATION OF FRAMSTAELLNING AV EN MINERALFIBERPRODUKT - Google Patents

Description

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Patent · oen regiitaratyrelaan '7 AmMun uttagd ochuti.tkriftm pubtiewad 3Q Qg q2 (32) (33) (31) Requested «cuoIIimi -» «gtrd Knights * ^ g ll.05.67, l8.Olt.68 France-Frankfurt (FR) 106273, 1060l »6, 148483

Proven-Styrkt (71) Compagnie de Saint-Gobain, 62, Boulevard Victor-Hugo, 92 Neuilly-sur-Seine, France-France (FR) (72) Claude Jumentier, La Celle Saint Cloud (Yvelines), Alain Bonnet,

The present invention relates to a process for the production of a mineral fiber product, in particular to a mineral fiber product, in particular to a mineral fiber product, in particular to a mineral fiber product, in particular to a glass fiber product, in particular to a mineral fiber product, in particular to a mineral fiber product, in particular to a mineral fiber product, in particular to a immediately after their formation is transferred to the receiving member to settle into a gauze formed by intersecting fibers, and during this transfer hard, undeformed mineral particles are introduced into the mineral fiber mass to distribute evenly as a result, the mineral particles introduced into the gauze are individually enclosed in spaces bounded by intersecting fibers, and on the other hand, the binder is cured. The invention also relates to a device for applying the method according to the invention.

The products made by the process of the invention have both good insulating properties and good dimensional stability and consist of a gauze formed by fibers bonded together by a binder and solid and undeformed particles in the form of individual grains separately enclosed in the mesh of the gauze and evenly distributed in the gauze.

62526

It has been found that such products, while having a tendency to deform, specifically compressed, are very small, essentially retaining the good insulating properties inherent in a fibrous structure of a mineral mass. This maintenance of good insulation is due to the fact that the particles are in contact with the fibers forming the surrounding loops only along very short dots or lines, so that virtually no thermal bridges are formed between said particles and the fibers.

The fact that these products have good shape stability is due to the fact that each particle prevents the local deformation of the loop around which it is surrounded and that due to the homogeneous distribution of the particles the deformation of the whole mass is prevented by the presence of all particles.

In general, it is appropriate to select the average particle size of the particles used according to the apparent bulk density of the fiber mass. In all cases, the particle size must be such that the particles will be inside the loops of the gauze forming the pulp; if the loops are very small use small particles, if the loops are large use large particles.

The average diameter of the gauze-forming fibers is preferably between 3 and 16 μm, the gauze having an apparent bulk density of between 25 and 200 kg / m 10-0.6 mm and the proportion of particles in the mass volume is of the order of 2-20% t, preferably 3-15% of the total volume of the product.

The apparent bulk density of the fibrous gauze is preferably between 35 and 100 kg / m 2 and the particles enclosed in the loops of this gauze are sand grains with a size between 0.10 and 0.40 mm.

Instead of sand, other solid and form-retaining particles can be used, which consist, for example, of ground glass, ground stones, coal ash sinter and the like.

According to a particular embodiment of the invention, the solid, deformable, gauze-enclosed particles contain from the cavity, and are preferably hollow mineral particles, such as in particular perlite and vermiculite. Products composed of such particles have the advantage that they are very light while still having good insulating properties and good shape stability.

3,62526

It has been found that in the case of pulps with a low specific gravity, the use of such particles, and in particular perlite, can achieve good resistance to deformation, especially under compression.

The average diameter of the fibers forming the gauze is then preferably between 3 and 16, the apparent bulk density of the gauze is T '-z between 8-80 kg / m 2, preferably between 8-50 kg / m 2, the particle size is greater than 0.1 mm and more preferably between 0.5 and 5 mm, and the proportion of particle mass in the total volume of the product is between 3 ~ 80, preferably between 10-50%.

The amount of particles used per unit volume of the final product depends on the bulk density of the product and the mechanical properties desired for it. In order for the mechanical properties, for example the compressive strength, to remain the same, it is suitable that the proportion of particles is higher the lower the amount of fibrous component per unit volume. On the other hand, when the amount of fiber per unit volume is the same, the higher the mechanical strength, the more particles must be used.

The method according to the invention is characterized in that the deformed mineral particles are conducted as a continuously descending, homogeneous mineral particle curtain under the influence of gravity, which annularly surrounds the mineral fiber stream, and that the mineral particles are blown from this descending curtain to the receiving member. The reduction in the volume of the settled mineral fiber gauze is preferably achieved by suction acting through the pulp.

According to one embodiment of the invention, a continuously descending, homogeneous mineral particle curtain falls from a partition surface surrounding the mineral fiber mass transferred to the receiving member.

According to another embodiment, in the case where the mineral fibers are transferred to the receiving member as an annular mass, which is given a rotating motion, the mineral particles are blown into said annular mass by moving them with a component directed opposite to the rotational motion of the pulp.

In this way, a better distribution of the binder in the fibers is achieved. The Applicant has found that the binder fed with the particles migrates from the surface of the particles to the fibers and ensures the binding of the fibers at the cruise points without the binder remaining in contact between the particles and the fibers, so that no thermal bridges are formed between the latter.

4,62526

According to the invention, the amount of particles introduced into the pulp can be varied according to the desired mechanical properties of the product.

The invention also relates to a device with which the method can be performed.

This apparatus has means for producing mineral fibers, in particular glass fibers, a receiving member on which the mineral fibers can be deposited, means for feeding a binder to its mineral fiber mass moving towards said receiving member, means for adding mineral particles homogeneously to , and the device according to the invention, characterized in that said means for homogeneously adding mineral particles comprise an annular distributor (distributor ring) from which the mineral particles can flow by gravity in a continuously falling, annular, homogeneous curtain, and means for receiving gas particles displacing mineral fiber mass.

According to one embodiment, an oscillating channel is arranged below the means for blowing the mineral particles into the fibrous mass, through which the fibrous mass with the mineral particles incorporated therein passes.

According to another embodiment, the device includes means for supplying mineral particles to the manifold as jets, wherein the circumferential inclination is at least equal to the pouring angle of the mineral particles, and that the mutual position of the mineral particle feed sites on said circumference is such that at the lower edge of the circumference, providing a continuous, homogeneous and uniformly thick layer of particles.

The means for supplying the mineral particles to the dispensing member consist of wires communicating through the openings with a mineral fiber supply device provided with homogenizing means which provide a substantially uniform particle layer thickness at all said openings.

The supply means to which said lines are connected are formed by parallel tubes with conveyor coils for circulating the mineral particles therein and for feeding the mineral particles uniformly to said openings and the lines connected thereto. The wires may preferably be troughs. In order to control the amount of particles flowing into the lines, i.e. the gutters, means can be arranged around the supply pipes, such as torn fittings, by means of which the size of the passages of the particles can be changed as desired.

According to yet another embodiment of the device according to the invention, the feed device is formed by an annular tube arranged above the inclined surface of the manifold and having holes from which the particles flow on the inclined surface of the manifold, the tube having a helical member for transferring particles.

Other features and advantages of the invention will become apparent from the following description.

Figures 1 and 2 show on a large scale a part of the fibrous worm uncompressed and compressed.

Figures 3 and 4 show, respectively, a fibrous mat according to the invention with solid filler particles, uncompressed and compressed.

Fig. 5 shows another embodiment of the device, and Fig. 6 a detail thereof.

Figure 7 is a perspective view of another embodiment of the device.

Figure 8 is an elevational view of the device of Figure 7.

Fig. 9 is a plan view showing the arrangement of the particle feed chutes.

Fig. 10 is a detailed view showing the flow of particles onto the distribution surface.

Figures 11-13 are details of the transport tube (Figure 11) and the perforated fitting (Figures 12 and 13).

Fig. 14 is a perspective view of yet another embodiment of the device, and Fig. 15 is a vertical sectional view of a detail of this embodiment.

In the pulp 1 shown in Fig. 1, the fibers are bonded to each other from their cruise points in a known manner by a binder. Four of these cruise points are marked with the reference letters A, B, C, and D. If this mass is subjected to mechanical stress, e.g., compression (Fig. 2), it is found that the mattress thickness decreases and that the quadrilateral ABCD decreases to the quadrilateral A’B’C’D ’.

6 62526

Figure 3 shows the same fibrous structure as Figures 1 and 2, but incorporates solid, full-material, deformable particles 2, enclosed within loops. The above cruise points are shown at A '^' O ^ D 'and are in substantially the same mutual position. If this mass is subjected to the same compressive force as above (Figure 4), it is found that the presence of each particle prevents the deformation of the loop in which it is enclosed, the points A '1' B '"C"' D '' 'remain in the same position as score, and that the decrease in overall thickness is much smaller than in the case of Figure 2.

In the embodiment shown in Figures 5 and 6, the particles 12 are decomposed from an annular container 16 which is concentric with the mass of fibers 2 coming from the device 17. The feed rate of the particles is controlled by control devices 18. The particles flow out of the annular nozzle 19 of the dispenser, thereby exposing them to the action of a circular blowing device 20 which ensures their homogeneous three-dimensional distribution throughout the fiber mass.

An annular horn 21 is arranged under the circular blowing device, through which the fiber mass passes and which moves in a hay-condensing movement. This horn makes it possible to have the fibers distributed regularly on the mattress forming belt.

The binder is fed into the pulp by nozzles 22.

Figures 7 and 8 of the drawing show a fiber manufacturing apparatus at 17 and a pulp formed at 2 by a high speed rotating body having a circumferential ring provided with holes through which fibers of material are ejected by centrifugal force and then stretched into fibers.

In the embodiment according to Figures 7-13, particles of matter, e.g. sand grains, to be incorporated into the fibrous mass are introduced into two funnels 30, from which they flow into tubular lines 31. Both of these lines have a conveyor coil 32 with a smaller diameter than the inner diameter of the line. These two helices 32 are driven synchronously by the gear motor 43.

The tubular conduits 31 have nozzles, i.e. holes 33 (Fig. 13), along their lower base line, and through them the particles displaced by the coils 32 flow. At each hole 33 there is a chute 34. Particles flow along each chute so that they arrive in the form of jets on the distribution ring 35. This ring is located concentrically with the rotating body 17. It has an inclined wall 36 on the inner side, the inclination of which is at least equal to the pouring angle of the particles.

The troughs 34 are arranged in such a way that the impact zones 37 of the particles on the inclined wall 36 of the ring 35 are located so that the particles flow freely along this wall to form layers 38 which spread so as to meet each other at the lower edge 39 of the wall 36, thus forming a homogeneous and continuous layer. It is to this layer that the gas flow from the circular nozzle 40 arranged at the bottom of the dispenser 35, which includes an annular chamber 41, is applied. in the direction of.

The pulp in which the particles are thus homogeneously dispersed then passes to a horn 44 which moves in an oscillating motion on an axis 45. This horn makes it possible to achieve a regular distribution of the fibers on the receiving belt on which the mattress is formed, after the fibers have been pre-impregnated with a binder by means of dispersing nozzles.

Figure 9 shows the arrangement of the troughs 34. Their slope “is determined so that their passage allows the particles to drain naturally (the passage must be at least 30 ° in the case of sand) and that their orientation is such that their impact zones 37 result in a continuous and uniform layer as described above. These troughs are attached to the claws 46 located above the distribution ring in such a way that they interfere with this device as little as possible.

The position of the conveyor coils 32 and their rotational speed are such that a layer of substantially constant thickness is obtained above the outlet holes 33 of all the pipelines 31. However, in order to obtain suitable feed rates to the trough 34 supplied by each such feed hole, cover fittings 47 provided with holes 48 of different lengths are fitted and secured to the pipelines so that they can be rotated and a hole corresponding to the desired feed speed 33 can be fitted to the feed holes. The protrusion 49 in each fitting cooperates with the notches in the wires 31 so that the fittings for each selected hole are brought into the correct position.

8 62526

In order to remove the excess particles and to avoid blockages in the lines, the outer ends 52 of the lines have holes 51 from which said particles escape.

The amount fed by the dispenser is a function of the diameter of the holes in the fittings 47 and the speed of rotation of the screws, the latter being adjusted so that all other holes feed except the extra openings 51. The latter do not feed except if the holes become blocked or malfunctioned.

In the modification shown in Figures 14 and 15, the particles fed to the hopper 53 are conveyed in an annular conduit 54 by a non-centered coil 55 rotated by a gear motor 56. This conduit is coaxial with the rotating body 17 and above an oblique wall 36 of the distribution ring 35 similarly as explained above. The conduit 54 has feed holes 57 through which the particles flow onto the wall 36 and likewise form a continuous, constant-thickness layer at the edge 39 of the distribution ring.

The following are examples of glass-fiber products according to the invention and reference values between these products and similar products which do not contain solid, full-bodied, undeformed particles in terms of insulation capacity and deformation resistance.

Example 1 a) Glass composition: SiO 2 66.3 # Al 2 O → 3.0 ^ F 2 O 3 $ 0.4

CaO 7.6

MgO 3.4 *

Na 2 O 14.0 1 ° K 2 O 1.1 # B 2 O 3 1.5

BaO 2.0 # F2 0.8 # b) Mean diameter of fibers: 6 μm c) Binder: phenol-formaldehyde resin d) Particle drive: sand e) Mean diameter of particles: 0.2 mm 9,62526

Product Product composition Heat;) Ohto- Load factor with which the thickness decreases 25 Ä! ^ 28.7 Kcal / m *% 470 Kg / .2

* T

In the product Fibers: 58 kg / m ^? sand Resin: 2 kg / m- '30.2 Kcal / m A ° C 880 kg / nr

Sand: 60 kg / nr

It can be stated that while the insulation capacity remained essentially the same, the load required to achieve the same thickness reduction increased by about two times.

Example 2 a) Composition of glass a) h) Average diameter of fibers c) Binder) Same as in Example 1 d) Particle drive) e) Mean diameter of particles)

Product Product composition Heat conduction- Load factor with which the thickness decreases 25 *

Product without Fibers: 54.5 kg / mi u \ ° n ιμλ ..sand Resin: 5.5 kg / m3 28.0 Kcal / m Λ c 1510 kg / m

In the product Fibers: 54.5 kg / m3 „sand Resin: 5.5 kg / nr 31.0 Kcal / mA ° C 2300 kg / nr

Sand: 90 kg / m · 5

Example 3 a) Glass composition: SiO 2 $ 61.3> Al 2® ^ 5.5 9 ^? 2 ° 3 0.6 9 ^

CaO 7.3 *

MgO 3.1 9 &

Na20 $ 13.9 K20 1.9 96 B203 $ 2.9

BaO 3.2 # b) Mean fiber diameter: 12 Jim c) Binder: phenol formaldehyde resin d) Particle type: sand e) Mean particle diameter: 0.2 mm 10 62526

Product Product composition Load reducing thickness 25 f »

Product without Fibers: 99 kg / m5 qooo, .- / 2 sand Resin: 11 kg / mp Kg / m

In the product Fibers: 99 kg / ® ~ p sand Resin: 11 kg / m ^ 16000 kg / m

Sand: 90 kg / πκ

The following are two examples of glass fiber products of the invention having perlite and vermiculite. These examples show the differences in insulation capacity and deformation resistance compared to the same products without said particles.

Example 4 a) Glass composition: SiO 2 69.0 i »Al 2 O 5 2.3 i ° P2 ° 3 0.4 *

CaO $ 9.0

MgO 2.9 *

Na20 13.5 ^ K20 0.2 £ B203 1.7% P2 0.5% o) Average fiber diameter: 6 μιη c) Binder: phenol-formaldehyde resin d) Particle type: perlite e) Particle diameter: 0.1-2 mm

Product composition Heat conduction- Load with which the coefficient thickness decreases 25 *

Product without Fibers: 36 kg / m :? OQ n Q_. ,, 2 perlites Hartela: (¢ 1: 5 28.7 Kcal / mAO 800 lcg / m

In the product Fibers: 36 kg / m? perlite Resin: 4 kg / nr, 30.0 Kcal / m N ° C 2200 kg / ur

Perlite: 18 kg / m0

It can be said that while the insulation capacity remained essentially the same, the load required to achieve the same thickness reduction increased almost threefold.

Example 5 a) Glass composition: same as in Example 1 b) Average fiber diameter: same as in Example 1 c) Binder: same as in Example 1 d) Particle type: Vermiculite e) Particle diameter: 3-6 mm 11 62526

Product composition Heat conduction- Load with coefficient la to thick decreases by 2b%

Product without Fibers: 36 kg / m5 28.7 Kcal / mX ° C 800 kg / m ^ vermiculite- Resin: ^ kg / nr in fiber: 36 kg / m ^ ,, vermiculite- Resin: 4 kg / m 29 29 »5 Kcal / nuC 1400 kg / mf tia Vermiku- ·, attaches 10 kg / nr

According to the invention, the fibers of the fibrous gauze are closed to the solid: crushed foam glass can also be rope as unformed particles.

Claims (13)

12 62526 A method for producing a mineral fiber product, in which mineral fibers, in particular glass fibers, are transferred immediately after their formation to settle on the receiving member into a gauze formed by intersecting fibers, and during this transfer hard the volume of the gauze deposited on the receiving member is reduced, as a result of which the mineral particles introduced into the gauze individually close to the spaces bounded by the intersecting fibers, and on the other hand the binder is cured as a annularly surrounded by a stream of mineral fibers (2), and that the mineral particles from this descending curtain to its mineral fiber mass descending on the receiving member with a gas stream (20; ^ 10). A method according to claim 1, characterized in that the reduction of the volume of the settled mineral fiber gauze is achieved by suction acting through the pulp. Method according to Claim 1 or 2, characterized in that the continuously descending, homogeneous mineral particle curtain falls from a partition surface (35, 36) which surrounds the mineral fiber mass (2) which is transferred to the receiving element. H. A method according to any one of claims 1 to 3, wherein the mineral fibers are transferred to the receiving member in the form of an annular mass subjected to a rotational motion, characterized in that the mineral particles are blown into the annular mass by a motion having a component directed opposite the rotational motion. Apparatus for applying the method according to claim 1, wherein the apparatus comprises means for producing mineral fibers, in particular glass fibers, a receiving member on which the mineral fibers can be deposited, means for feeding a binder to the mineral fiber mass towards said receiving member a means for reducing the volume of the mineral fiber mass deposited on the receiving member and means for curing the fed binder, characterized in that means for adding the mineral particles homogeneously. comprises an annular distributor (distributor ring) (16; 35) from which the mineral particles (12) can flow under the action of a piano force as a continuously falling, annular, homogeneous curtain, and means (20; Jjo) for blowing mineral particles falling from the distributor (35) towards the mineral fiber pulp (2). Device according to Claim 5, characterized in that an oscillating channel (21) is arranged below the means (20) for blowing mineral particles, through which the fibrous mass (2) with the mineral particles incorporated therein passes. Device according to claim 5, characterized in that it comprises means (3 * 0 for feeding mineral particles to the distribution ring (35) as jets (38), the circumference of the circumference being at least equal to the pouring angle of the mineral particles, and the mutual position of the mineral particle feed points , that the jets of mineral particles (38) spreading on the inclined surface (36) of the circumference come into contact with each other at the lower edge (39) of the circumference, providing a continuous, homogeneous and uniform layer of particles. Device according to Claim 7, characterized in that the means for feeding the mineral particles to the distributor consist of lines (3 * 1) which, via the openings (33), communicate with a mineral particle supply device (31) provided with homogenizing means (32) a substantially uniform particle layer thickness at all apertures (33). Device according to Claim 8, characterized in that the feed element to which the lines (3 * 1) are connected is formed by parallel tubes (31) with conveyor coils (32) for circulating the mineral particles therein and for feeding the mineral particles uniformly into the openings (33) and their connected wires (3 * 1). Device according to Claim 8 or 9, characterized in that the cables are troughs (3 **). Device according to one of Claims 8 to 10, characterized in that the supply element (31), to which the lines (3 * 0) are connected, has other openings (51) for removing excess mineral particles. Device according to one of Claims 8 to 11, characterized in that the supply element (31) »to which the wires (3 * 0 are connected) has means (47) for individually adjusting the size of the openings (48) through which the supply element communicates with the wires (34). ). Device according to claim 7, characterized in that the means for supplying mineral particles to the distributor consist of an annular tube (54) arranged above the inclined surface (36) of the distributor ring (35) and provided with a helical conveyor member (55) for conveying mineral particles within the annular tube and with openings (57) for feeding mineral particles to the inclined surface (36) of the manifold.