JPH05195402A - Method and apparatus for preparing mineral fiber board and mineral fiber board prepared thereby - Google Patents

Abstract

PURPOSE: To provide a process for producing a mineral fiber board which maintains the bending strength of the conventional mineral fiber board without the impairment of the tensile strength in a longitudinal direction acting in a direction where the folded mineral fiber layer is spread. CONSTITUTION: In the process for producing the mineral fiber board by transporting the mineral fiber layer 3 consisting of a binder and mineral fibers to a continuously heating furnace 7 by a conveyor 2; the mineral fiber layer 3 is precompressed in its thickness direction and is then expanded and is folded in its longitudinal direction during the transporting of the fiber layer to the furnace. The mineral fibers of the mineral fiber layer 3 are felted and the mineral fiber layer 3 is compressed so as to maintain a practically flat surface in its thickness direction after the curing thereof. At this time, the perpendicular component of force which can be exerted on the mineral fibers in the region to be felted is maximized, by which the mineral fiber layer is felted in the desired region.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a mineral fiber board. In this manufacturing method, the mineral fiber layer consisting of the binder and the mineral fibers is conveyed to the continuous heating furnace by the conveyor device, until it is carried into the continuous heating furnace, the mineral fiber layer is compressed in its thickness direction, It is then expanded and folded in its longitudinal direction. Next, the mineral fibers of the mineral fiber layer are made into a felt shape, further hardened to a flat surface and compressed to a practical thickness. The invention also relates to a manufacturing device suitable for carrying out such a method, as well as to the mineral fiber board to be manufactured.

[0002]

2. Description of the Related Art Various methods have been proposed for increasing the strength of a mineral fiber board and, if necessary, its rigidity. For example, CH-C-620 861 pre-compresses and folds the mineral fiber layer during the manufacture of the mineral fiber board, thereby gathering many fibers at the ends of the mineral fiber layer on the major surface of the mineral fiber board. be able to. This method also discloses that after the binder is hardened, the mineral fiber layer is compressed in its thickness direction so that it is mainly flat, which also achieves uniform fiber amount. be able to. Further, the compression after hardening of the binder increases the compressive strength and the tensile strength in the transverse direction of the finished mineral fiber board.

Also, a similar method is disclosed in DE-A-38 32 773. In this method, the mineral fiber layer is expanded in the longitudinal direction by a mechanism arranged in tandem until it is loaded into the continuous heating furnace, whereby the mineral fiber layer is compressed in the longitudinal direction. With this method, it is possible to avoid a situation in which the expansion of the mineral fiber layer after precompression has to be performed relatively rapidly in the region before entering the continuous heating furnace. With this improved method, CH-C-620
The method disclosed in 861 can be applied to various kinds of mineral fibers.

[0004]

However, although the compressive strength and the tensile strength due to the folding of the mineral fiber layer as described above have obtained good values in the lateral direction, they act in the direction of expanding the folded mineral fiber layer. In the longitudinal direction, the tensile strength and bending strength were poor.

This drawback is due to EP-A-0 133 08
As proposed in No. 3, the general orientation of the fibers in the longitudinal direction of the plate should not be changed significantly and should be overcome by orienting the fibers in the inner region of the plate in as many directions as possible. I won't. With the exception of methods that are costly to achieve, the proposed practical methods lack the properties of the folded mineral fiberboard in the final product.

A method of the kind mentioned at the outset and a device for carrying out the method are well known from DE-A-16 35620. Then, by such a method, the mineral fiber layer is made to have a felt shape over the entire thickness in order to densify the expanded portion.

It is often necessary to be able to make mineral fiberboards that have a complete and consistent strength property set by the customer. In particular, a mineral fiber board having a precisely defined density side surface perpendicular to the board surface may be required. However, at present, there is no manufacturing method or manufacturing apparatus for manufacturing a mineral fiber board having such a density profile.

[0008]

OBJECTS OF THE INVENTION Therefore, it is a technical problem underlying the invention to provide a method by which a mineral fiber board having a defined density profile can be produced. Also,
At the same time, it must be achieved that at least the bending strength of conventional, generally felted, longitudinally compressed mineral fiber boards is retained.

[0009]

SUMMARY OF THE INVENTION In the method of the present invention, the mineral fiber board is made to have a felt area in the desired area by maximizing the vertical component of the force that can be exerted externally on the mineral fiber in the area to be felted. Be converted. Depending on the degree of the maximum value of the vertical component of the exerted force, the mineral fibers are felted to adjust the mineral fibers in the region. The felted region, as is already known, prevents the longitudinally compressed part from spreading, so that the tensile strength in the longitudinal direction is not impaired, and the bending of conventional mineral fiber boards is not impaired. Can maintain strength.

According to the present invention, it is possible to form the predetermined regions of the mineral fiber board on desired side surfaces of the density. At the same time, the density of the mineral fibers can be continuously or stepwise changed from the surface toward the inside 7.
The density of the non-felt region of the mineral fiber board is 30 to 150 kg / m ³ , and the density of the felt region is 8
It can be 0 to 220 kg / m ³ .

Maximizing the vertical component of the force exerted on the mineral fibers is achieved, for example, by inserting needles or pins into the mineral fiber layer. The relative velocity in the area to be felted is then minimized between the needle or bottle and the mineral fiber. In this case, the force is generated by the adhesive force of the adhesive, the magnitude of which depends on the adhesive force between the needle or pin and the mineral fiber.

The apparatus for producing a mineral fiber plate of the present invention comprises a conveyor device for transferring the mineral fiber layer, a pre-press for pre-compressing the mineral fiber layer, and an expansion of the mineral fiber layer for longitudinal compression. It is provided with a compression device, a felting device arranged on the downstream side of the compression device, a continuous heating furnace for producing a mineral fiber board, and a transfer belt device. The felting device is then arranged in front of the transfer belt device and the continuous heating furnace is arranged behind the transfer belt device. In addition, the felting facility incorporates a mechanism that maximizes the vertical component of the force exerted on the mineral fibers of the mineral fiber layer. A device for the vertical component of force can be realized, for example, by providing a needle plate mechanism with oscillating needles through different depths in the area of the mineral fiber layer to be felted. At that time, the moving speed of the needle is mainly a sine function which becomes the minimum speed at the turning point of the oscillating motion.

The needle is provided with at least one whisker protruding from the outer peripheral surface thereof. Alternatively, instead of the beard, a concave portion that is depressed from the outer peripheral surface of the needle may be provided, or they may be combined. Such whiskers or recesses are spaced apart from each other and are continuously arranged in a row in the longitudinal direction of the needle, or are arranged in a staggered manner. The protruding whiskers or the convex portions between the adjacent concave portions move the mineral fibers in accordance with the movement of the needle plate, and thus generate a vertical force on the mineral fibers. This force can be varied by causing the needle to perform a sinusoidal movement relative to the moving mineral fiber layer.

Further, it is possible to set plural kinds of needle lengths. As a result, in a certain area of the mineral fiber layer, only the long needle acts as a felt, and the other short needles contribute to the felting in another area. Still further, it is possible to provide the whiskers or recesses not over the entire length of the needle, but only in the region of the lower end portion, for example. The needle plate mechanism is preferably arranged on both sides of the mineral fiber layer with the needle facing the mineral fiber side.

The device for the vertical component of the force can also consist of a rotating metal brush with adjustable speed of rotation. In this case, the brush pin acts like a whisker on the needle of the needle plate. This form of device is preferentially used when it is necessary to act on the surface area of the mineral fiber layer, the pin length or needle length of the brush being felted of the mineral fiber layer. It is set equal to the thickness of the surface area to be powered. Further, the metal brushes are arranged on both sides of the mineral fiber layer, and the interval between the cylindrical parts or the disk parts to which the brush pins are attached is set to be substantially equal to the thickness of the mineral fiber plate to be manufactured.

It has been found to be particularly advantageous for the surface treatment of the mineral fiber layer when the felt device comprises a metal brush and a needle plate. Metal brushes are advantageous for continuous treatment of mineral fiber layers, but the needle strength is too low, requiring several treatments or more metal brushes for good results. To avoid this
In addition, a needle plate is used.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a mineral fiber board manufacturing apparatus 1. In this mineral fiber board manufacturing apparatus 1, the mineral fibers are conveyed to the preliminary press 4 by the conveyor 2, and are bonded and compressed as the mineral fiber layer 3 in the meantime. The preliminary press 4 has large diameter rollers 26 and 27 facing each other. A compression device 5 having a plurality of compression rolls is arranged on the downstream side of the preliminary press 4. The compression device 5 shrinks the mineral fiber layer in the longitudinal direction.

That is, the compression device 5 conveys the mineral fiber layer 3 discharged from the pre-press 4 toward the continuous heating furnace 7 side,
Meanwhile, the mineral fiber layer 3 passes through the belt conveyor 6.
The compression roll is operated so that the peripheral speed gradually decreases toward the downstream side, whereby the mineral fiber layer 3 is gently expanded and is folded and compressed in the longitudinal direction (compressed). ).

This compression device 5 for compressing in the longitudinal direction is also used.
There are two metal brushes 2 that rotate facing each other.
A felting device 8 having 8, 29 is arranged.
The metal brushes 28, 29 have a length that extends over the entire width of the mineral fiber layer 3. The metal brushes 28, 29 have a large number of pins or needles attached to the surface of the roller, and the length of these pins or needles is substantially the same as the thickness of the surface region of the mineral fiber layer 3 to be felt. Is the same as
Also, the distance between the outer peripheral surfaces of the rollers substantially matches the thickness of the mineral fiber board to be manufactured. In addition, the pins or needles tear fibers preferentially from the expanded portions of the mineral fiber layer, making some adjacent expanded portions felt-like. This not only mixes and bonds the fibers of the expanded parts together, but at the same time smoothes the surface of the mineral fiber layer 3. The belt conveyor 6 arranged on the downstream side of the felting device 8 further smoothes the surface of the mineral fiber layer 3, and then the mineral fiber layer 3 is conveyed to the continuous heating furnace 7.

In carrying out the method of the present invention with this apparatus, first, the mineral fibers mixed with the binder are transferred to the conveyor 2
Placed on top. This mineral fiber is conveyed to the preliminary press 4 by the conveyor 2. At that time, the mineral fiber layer 3 is formed to have a thickness determined by the distance between the rolls 26 and 27 of the preliminary press 4. Then, the pre-compressed mineral fiber layer 3 is passed through the compression device 5, where the longitudinal compression is performed by the convolution as described above. In the felting device 8, since the surface area of the mineral fiber layer 3 is torn at an arbitrary preselected depth, it is isotropic in the areas of some inflated parts of the mineral fiber layer 3 which are close to each other. Aligned fibers are bonded together. The highly homogenized surface areas, ie the upper and lower surfaces of the mineral fiber layer 3, are further smoothed by the opposing conveyor belts 24, 25 of the belt conveyor 6,
Is cured into a hard plate and conveyed to the continuous heating furnace 7.

Next, reference numeral 2 in FIG. 2 shows another example of the apparatus for producing a mineral fiber board. The apparatus 2 for manufacturing a mineral fiber board shown in this figure has the same structure and function as the other constituent elements except that the form of the felting apparatus is different from that of FIG. The mineral fiber layer 3, which is continuously folded by a longitudinal compression device 5 similar to that described above, is conveyed to the felting device 8. The felting device 8 is removably attached with needle plates 30 and 31 facing each other and capable of approaching and separating from the mineral fiber layer 3 by a suitable transmission device. The surface of the needle plates 30 and 31 on the side of the mineral fiber layer 3 is shown in FIG.
An array of needles is provided as shown in. The needle arrangement is
The inside of the mineral fiber layer 3 can be made into a felt with a constant density distribution, and its shape is adjusted so that a desired degree of felting can be obtained.

FIG. 3 shows a first example of a needle plate 30 to which a plurality of needles 32 (only four are shown in the figure) for adjusting the mineral fiber layer 3 are attached. In the figure, the needle plate 3
It shows that a stroke motion of 0 can take four positions with respect to the mineral fiber layer 3. A plurality of whiskers 33 protruding from the outer peripheral surface of each needle 32 are attached, and in this example, they are arranged at equal intervals. Needle plate 30
Can be moved up and down at a vertical speed that draws a substantially sinusoidal function with respect to the lateral movement of the mineral fiber layer 3. The maximum stroke of the needle plate 30 at that time is, for example, 60.
It can be set to mm.

All or half of the needle 32 is inserted into the mineral fiber layer 3 at the lower turning point of the vertical movement, while the entire needle 32 is pulled out from the mineral fiber layer 3 at the upper turning point of the vertical movement. As a result, the action of the whiskers 33 on the mineral fibers by the movement of the needle 32 acts on the mineral fibers only about half of the entire movement. Further, since the needle 32 draws a substantially limiting curve in relation to the mineral fiber layer moving in the lateral direction,
The whiskers 33 due to the speed change until the needle 32 is sunk and returned.
Carries mineral fibers only in a limited area within the mineral fiber layer 3.

That is, in the middle region of the limiting curve, whiskers 3
Since the vertical velocity of 3 is high, the adhesion between the whiskers 33 and the mineral fibers is low, so that the whiskers 33 do not carry the mineral fibers. However, when the turning point on the lower side approaches, the speed of the whiskers 33 is reduced to zero, so that the whiskers 33 have a high adhesive force with the mineral fibers, and thus the whiskers 33 catch the fibers and turn upward.

For example, in the arrangement of the whiskers 33 shown in FIG. 3, the speed of the whiskers 33 is shown near the boundary between the intermediate area B and the surface C separated from the surface, that is, the second from the left in FIG. The speed of the whiskers 33 is low near the processed end of the needle plate 30 and near the surface of the region A. In this region, the adhesive force between the whiskers 33 and the mineral fibers is strong, so that a stronger vertical component acts on the mineral fibers, resulting in a stronger felting than in other regions. Thus, in the present invention,
Depending on which region of the mineral fiber layer where the slow-moving region of the whiskers 33 is arranged, regions having different felting can be set in stages.

Next, FIG. 4 shows another example of the needle plate, which is an example for forming a stepwise change in felting by a simple method. In this embodiment, half the needle 32 is short,
Since the remaining half of the needles 34 are formed long, the felting is strong in the region A of the mineral fiber layer 3 near the surface. Needless to say, the needle 34 has a region A and a region B following it.
But it works. In addition, if more types of needle length are set, the number of stages of ferritization can be increased.

Yet another embodiment of the needle plate is shown in FIG. In this example, it is provided only on the lower end of the needle 35. By using such a needle plate, the region A close to the surface of the mineral fiber layer 3 remains substantially unaffected, but the whiskers 33 are based on the velocity change due to the sinusoidal movement. It works only in the area B inside the fiber layer 3. As described above, in the region A, the whiskers 33 move up too fast, so that the whiskers rarely move the mineral fibers, and thus the felting is not performed.

It should be noted that the needle plates on both sides of the mineral fiber layer 3 as shown in FIG. 2 are combined with the metal brushes 28, 29 as in the case of FIG. Whether to do it is selected according to the purpose of use. At that time, the needle plates 30 and 31 are connected to the pair of rotating metal brushes 28 and 29 facing each other, as described above with reference to FIG. This needle plate 30, 31
A belt conveyor having conveyor belts 24 and 25 facing each other and flattening the surface of the mineral fiber layer 3 is arranged on the downstream side of the felting apparatus including the metal brushes 28 and 29.

Next, FIG. 6 shows a cross section of the mineral fiber board 3 in which the surface regions 36, 37 have been treated. As shown in this figure, in the surface regions 36 and 37, the isotropicity of the fibers is lost, but in the intermediate region 38, the folded structure generated by the longitudinal compression is maintained, and the homogeneous isotropic fiber layer is present. Is left in. Further, FIG. 7 shows a cross section of a mineral fiber board manufactured using the needle plate shown in FIG. As shown in this figure, the folded region which is not affected by the felting remains in the region close to the surface, but the intermediate region 39 is made uniform. It has been confirmed that a sinusoidal vibration selected from the range of 5 to 25 Hz is advantageous for the frequency of motion of the needle plate.

[0030]

As described above, according to the present invention, the above-mentioned region is felted by maximizing the vertical component of the force that can be exerted on the mineral fiber in the region to be felted. Needless to say, the required bending strength can be imparted, and the degree of felting in a predetermined region in the thickness direction can be set arbitrarily.

[Brief description of drawings]

FIG. 1 is a side view of an apparatus for producing a mineral fiber board used for carrying out the method of the present invention, showing an example in which a pair of metal brushes is used.

FIG. 2 is a side view showing another example of an apparatus for producing a mineral fiber board for carrying out the method of the invention, which is an example having a pair of metal brushes and a needle plate mechanism.

FIG. 3 is a diagram showing a first example of a needle plate mechanism.

FIG. 4 is a diagram showing a second example of the needle plate mechanism.

FIG. 5 is a diagram showing a third example of the needle plate mechanism.

FIG. 6 is a view showing a cross section of a mineral fiber board produced by the method of the present invention.

FIG. 7 is a view showing a cross section of another mineral fiber board produced by the method of the present invention.

[Explanation of symbols]

 2 Conveyor device 3 Mineral fiber layer 4 Preliminary press 5 Compression device 6 Transfer belt device 7 Continuous heating furnace 8 Feltization device 28,29 Metal brush 32,33 Needle 30,31 Needle plate mechanism 33 Whiskers

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Josef Wierznig Austria A-9702 Ferndorf Numer 149 (72) Inventor Dieter Relchbaum Austria A-9800 Spital Bismark Strasse 7

Claims (13)

[Claims] 1. A continuous heating furnace (7), wherein a binder for binding the mineral fiber layer (3) and the mineral fibers are placed on a conveyor device (2) to convey them to the continuous heating furnace (7). The mineral fiber layer (3) is pre-compressed in its thickness direction while being conveyed to, then expanded and folded in its length direction, and then the mineral fibers of the mineral fiber layer (3) are made into a felt, Furthermore, after the mineral fiber layer (3) is cured, it is compressed in its thickness direction so as to have a practically smooth surface. A method for producing a mineral fiber board, which comprises making the above-mentioned region felt by maximizing a vertical component of a force exerted on the mineral fiber in the region to be felted. 2. The vertical component of the force is at least the needle (3
2, 34, 35) or a pin is maximized by being inserted into the mineral fiber layer (3), with a minimum relative velocity between the needle or pin and the mineral fiber in the range to be felted. The method for producing a mineral fiber board according to claim 1, characterized in that. 3. A conveyor device (2) for conveying the mineral fiber layer (3), a preliminary press (4) for precompressing the mineral fiber layer (3) in the thickness direction, and the mineral fiber layer (3). Fiber equipped with a compression device (5) for expanding and compressing in the longitudinal direction, a felting device (8) provided on the downstream side of the compression device (5), and a continuous heating furnace (7) In the plate manufacturing apparatus, a transfer belt device (6) is arranged on the downstream side of the felting device, the transfer belt device (6) is arranged on the downstream side of the continuous heating furnace (7), and the felt is further arranged. The apparatus (8) for producing a mineral fiber board, characterized in that it comprises means for maximizing the vertical component of the force transmitted to the mineral fibers of the mineral fiber layer (3). 4. The felting device (8) comprises a needle plate mechanism (30, 30) provided with vibrating needles (32, 34, 35).
31), and the movement speed thereof is a substantially sinusoidal function which becomes the minimum speed at the turning point of the oscillating movement, and the mineral fiber board manufacturing apparatus according to claim 3. 5. Mineral fiber according to claim 4, characterized in that each of the needles (32, 34, 35) is provided with at least one whisker (33) protruding from its peripheral surface. Plate manufacturing equipment. 6. The apparatus for producing a mineral fiber board according to claim 4, wherein a plurality of types of lengths of the needles are set. 7. The needle plate mechanism comprises two needle plates (30, 31) arranged facing each other, and a plurality of needles (3) are provided on the side facing the mineral fiber layer (3).
2, 34, 35) are provided, The manufacturing apparatus of the mineral fiber board in any one of Claim 4 thru | or 6 characterized by the above-mentioned. 8. The felting device (8) according to claim 3, characterized in that it comprises at least a rotatable metal brush (28, 29) whose rotational speed can be selected and varied. Mineral fiber board manufacturing equipment. 9. The metal brush (28, 29) has a cylindrical portion or a disc portion to which a large number of pins or needles are attached, and two of them are arranged facing each other. Is approximately equal to the thickness of the layer of the surface area (36, 37) of the mineral fiber layer (3) to be felted, and the distance between the cylindrical parts or the disk parts is the same as that of the mineral fiber plate to be manufactured. The mineral fiber board manufacturing apparatus according to claim 3, wherein the thickness is substantially equal to the thickness. 10. Mineral according to any one of claims 3 to 9, characterized in that the felting device (8) comprises a metal brush (28, 29) and a needle plate mechanism (30, 31). Fiberboard manufacturing equipment. 11. The fiber at least near the surface (36, 37) is felted.
Alternatively, a mineral fiber board manufactured by the method for manufacturing a mineral fiber board described in 2. 12. The mineral fiber board according to claim 1, wherein the degree of felting gradually changes at least toward the surface (36, 37) or continuously increases. A mineral fiber board manufactured by the manufacturing method of. 13. The method for producing a mineral fiber board according to claim 1, wherein at least fibers close to the surface are not felted but are felted in the intermediate region (39). Manufactured mineral fiber board. .