WO1994005842A1

WO1994005842A1 - Process and device for manufacturing a low bulk density insulating board made of fibrous materials, compressing station therefor and insulating board thus manufactured

Info

Publication number: WO1994005842A1
Application number: PCT/EP1993/002450
Authority: WO
Inventors: Heimo Neuhold; Dieter Lerchbaumer
Original assignee: Heraklith Baustoffe Ag
Priority date: 1992-09-10
Filing date: 1993-09-10
Publication date: 1994-03-17
Also published as: AU4959693A; DE4230356C1; ATA904793A; AT403484B; DE4230356C2

Abstract

A compressing station acting in three dimensions in a device for manufacturing an insulating board made of fibrous materials allows an insulating board to be produced which on the one hand has a low bulk density and on the other hand has substantially homogeneous product properties.

Description

Description of q

The invention relates to a method and a device for producing an insulation board from fibrous materials with a low bulk density, a compression station therefor and an insulation board produced thereafter.

It is known to manufacture products based on rock wool using the so-called light wool process. A melt is continuously produced in a cupola furnace from a mixture of dolomite, amphibolite and diabase with the addition of coke, which is fed to a spinner. The spinner produces the stone wool and brings it into contact with a binder at the same time. The resulting wool is collected in a collecting shaft and passed on to a support belt. -? _

The rock wool is then transferred via a pendulum belt to a collection and transport belt that runs at an adjustable speed. In this way, raw nonwovens of different thicknesses can be produced.

If necessary, two-dimensional compression in the thickness and length direction can then be carried out with the aid of several rotating rollers. If necessary, laminations are applied before the raw fleece is passed on to a hardening furnace. The binder hardens in this hardening furnace. At the same time, a final thickness is set by means of a mesh belt running over the fleece. The fleece leaves the hardening furnace with a specific density and thickness and is then passed through a cooling zone. Finally, the surface treatment of the now hardened finished fleece is carried out, for example grooves being milled in and the fleece being brought to its desired dimensions by means of appropriately guided saws. Additional lamination can be applied in intermediate or subsequent steps if this is desired for the end product.

Such a method with two-dimensional compression of the primary fleece has been used with good success in the applicant's company for the use of rock wool.

It is the problem underlying the invention to provide a method and an apparatus with which or with which low-density insulation boards can be produced from fibrous materials which are isotropic in their product properties. At the same time, a compression station must be developed for this. Finally, the invention relates to a corresponding insulation board. This object is achieved by a method according to claim 1 or by an apparatus according to claim 2. Advantageous embodiments of the device and the compression station are the subject of the dependent claims. The specification of an insulation board which is produced according to the invention is specified in claim 9.

According to the method according to the invention, the fibrous materials are processed into individual fibers, the individual fibers are wetted with a binder, the wetted fibers are deposited as an essentially continuous primary nonwoven, the primary nonwoven is compressed three-dimensionally and then cured. Surprisingly, it has been found that anisotropies in the end product are almost completely eliminated if additional compression in the width direction is provided compared to the prior art. Instead of the known two-dimensional compression of the primary fleece, three-dimensional compression takes place according to the invention, namely additionally in the width direction.

Water glass, resin combinations and silicates can be used as binders.

As with the known method, the cured fleece can be machined on the edge and surface if necessary.

The complete device according to the invention comprises a device for processing the fibrous materials into individual fibers, a device for wetting the individual fibers with a binder, a conveyor belt for conveying the fibers laid as a substantially continuous primary nonwoven, and at least one set of rotating rollers for compressing the primary nonwoven, a curing oven. It is characterized in that a plurality of sets of rotating rollers is provided, the rollers of each set essentially enclosing the primary fleece in the region of its circumferential line, which defines the desired dimensions of the primary fleece in the thickness direction and in the width direction in this area, and in Direction of transport of the Prim rvlieses successive sets of rollers are designed so that the effective roller surface decreases in the thickness direction and / or in the width direction. The entire roller arrangement can be set so that the primary nonwoven is optionally compressed only in the width direction, only in the thickness direction or both in the width and in the thickness direction. Conveniently, however, each set of rollers will be adjusted so that compression in the width and thickness directions is simultaneously exerted on the primary web as it moves through the roller assembly.

Each circumferential line, along which the rollers of a set are arranged, is advantageously circularly curved in the width direction of the primary nonwoven so that the fibers of the primary nonwoven are given a certain preferred direction by the advance of the rollers.

It has been found that particularly good results with regard to the isotropy of the end product are achieved if the circumferential lines in the width direction are partial lines of concentric circles. The longitudinal compression of the fibers of the primary fleece can be achieved in that each set of rollers rotates at a rotational speed which decreases in the direction of transport of the primary fleece.

According to a preferred embodiment of the invention, each set of rollers comprises the same number of rollers in an equivalent arrangement. In this case, for example, five rollers can be provided on the top side and five rollers on the bottom side of the primary fleece in each set, and one roller in each side area.

It is particularly preferred in this type of arrangement of the rollers that corresponding rollers of respective sets of rollers are arranged along paths which converge in the form of rays.

Between two adjacent sets of rolls, i.e. Compression stages, an intermediate stage, also formed by rolling or else by belts, can be arranged. The rollers of such an intermediate stage run at the same peripheral speed as the rollers of the subsequent roller set. The respective intermediate stage or the rollers or belts have a one-way clutch, so that the rollers or belts are carried along by the primary fleece. For a more detailed structure of these intermediate stages and their mode of operation, reference is made to the previously published EP 0365826 by the applicant.

An insulation panel produced by the method according to the invention or the device according to the invention has

3 a bulk density in the range of about 30 to 200 kg / m.

It shows through with the procedure or through the - o -

The device achieved anisotropic fiber orientation on all sides of almost uniform product properties.

The invention will be explained in more detail below by way of example with reference to the accompanying drawing. It shows:

Fig. 1 is a perspective, highly schematic

Representation of a compression station which forms the part of the device according to the invention with which the three-dimensional compression is implemented;

Fig. 2 shows the compression station of Fig. 1 in plan view; and

Fig. 3 shows the compression station of Fig. 1 in side view.

A device with which an insulation board can be produced is described in the older German patent application P 42 12 828.5, "Process for producing an insulation board and insulation board produced thereafter". This can also be used for the method according to the present invention if the compression station is replaced by that from the device to be described. Reference is therefore made to the aforementioned patent application insofar as it relates to the other components of the device for producing an insulation board.

1 shows a perspective view of a compression station as used in a device according to the invention. It consists of four sets of 100, 200, 300, 400 rotating rollers. Each set of rolls, as explained by way of example on set 100, comprises five upper rolls 102, a first side roll 104, which on the in the production or transport direction of a primary fleece 500 by one Indicated by the arrow, located on the left side of the top rollers 102, a second side roller 106 located on the right side of the top rollers 102, and five bottom rollers 108 substantially aligned with the top rollers 102 but spaced from these lie. The upper rollers 102 and the lower rollers 108 are dimensioned the same, while the side rollers 104, 106 have a larger roller width in the example shown here. The axes of the upper rollers 102 and the lower rollers 108 each lie in a common plane, the center of the axes being arranged on an arc 110 and 112, respectively. The axes of the side rollers 104, 106 are arranged perpendicular to the circular arc lines, so that overall the areas of the rollers 102, 104, 106, 108 acting on the primary fleece 500 at this point define a circumferential line or contour for the primary fleece 500, through which The thickness and width of the primary fleece 500 are determined.

The arrangement of the rollers in the sets 200, 300, 400 is completely equivalent. The curvature of the circular arc lines mentioned is chosen so that they are to be regarded as parts of concentric circles, and the width of the roller decreases in the transport direction. The rollers of each set 100, 200, 300, 400 arranged at corresponding positions are arranged along radially converging paths, so that the width and the thickness of the primary fleece 500 are continuously reduced.

In order to achieve the longitudinal compression of the primary fleece 500, the peripheral speed of the roller sets 100, 200, 300, 400 is chosen to decrease in the direction of transport, ie the rollers of the set 100 have the highest Rotation speed, which on the other hand reduced the set 200, that of the set 300 once more compared to that of the set 200, while the speed of the rollers of the set 400 is the lowest.

The fibers wetted with binder are on a

Conveyor belt, not shown in the figure, the

Compression station supplied, where they are now compressed as primary fleece 500 to a desired bulk density. Since that

Primary fleece initially only as a loose composite of wetted

Fibers is present, a large range of raw densities can be set. Densities as low as 30

3 to 200 kg / m can be achieved.

FIG. 2 shows a top view of the compression station of FIG. 1. It can clearly be seen that the axis centers of corresponding rollers of the various sets 100, 200, 300, 400 lie on straight lines which converge in a radial manner. The plane defined by the axis centers of all upper rollers 102, 202, 302, 402 is inclined in accordance with the desired compression of the thickness of the primary fleece 500. The same applies to the lower rollers, which are not visible in FIG. 2.

FIG. 3 shows a side view of the compression station from FIG. 1, from which it can be seen that the width of the side rollers 104, 204, 304, 404 is selected such that it is greater than the clear distance between the upper rollers 102, 202, 302 , 402 and the lower rollers 108, 208, 308, 408 and thus the set thickness of the primary fleece 500 in the respective areas of the compression station.

Other configurations of the compression station are also conceivable. For example, one for each set of rollers Different number of rollers are selected with the aim of essentially completely covering the primary fleece passing through in the respective area. The widths of the rolls can also be different in each set of rolls. It is also possible to increase or decrease the number of roller sets if the product specifications require or allow it.

Claims

Patent claims

1. A method for producing an insulation board from fibrous materials with low bulk density, in which

the fibrous materials are processed into individual fibers,

the isolated fibers are wetted with a binder,

the wetted fibers are deposited as an essentially continuous primary fleece,

the primary fleece is three-dimensionally compressed and

which is then cured.

2. Device for producing an insulation board from fibrous materials with low bulk density, with

a device for processing the fibrous materials into individual fibers,

a device for wetting the individual fibers with a binder,

a conveyor belt for conveying the fibers deposited as an essentially continuous primary fleece,

and at least one set of rotating rollers for compressing the primary web, characterized in that

a plurality of sets (100, 200, 300, 400) of rotating rollers is provided,

the rollers of each set essentially surround the primary fleece (500) in the region of a circumferential line or contour, which defines the desired dimensions of the primary fleece in the thickness direction and in the width direction in this region, and,

the successive sets of rollers in the direction of transport of the primary fleece (500) are designed such that the effective roller surface decreases in the thickness direction and / or in the width direction

3. Apparatus according to claim 2, characterized in that each circumferential line is circularly curved in the width direction of the primary fleece (500).

4. Apparatus according to claim 2 or 3, characterized in that the circumferential lines in the width direction are partial lines of concentric circles.

5. Device according to one of claims 2 to 4, characterized in that each set of rollers (100, 200, 300, 400) rotates at a rotational speed which decreases in the transport direction of the primary fleece (500).

6. Device according to one of claims 2 to 5, characterized in that each set of rollers (100, 200, 300, 400) comprises the same number of rollers in an equivalent arrangement.

7. The device according to claim 6, characterized in that corresponding rollers (eg 102, 202, 302, 402; 104, 204, 304, 404) of the respective roller sets (100, 200, 300, 400) along radially converging paths or Straight lines are arranged.

8. Compression station, designed according to one of the preceding claims.

9. Insulation board, manufactured by the process according to

Claim 1, characterized in that it has a bulk density in the range of about 30 to 200 kg / m 3.