SE505340C2 - Method and apparatus for partial deformation of edges of mineral wool boards - Google Patents

Abstract

The invention relates to a method and an apparatus for manufacture of mineral wool plates, at least one edge of which is softer than the remaining parts of the plate. This is provided in that several discrete deformations are made along said at least one edge, which deformations are separated from each other by non-deformed portions.

Description

15 20 25 30 'rflf fi ll l-fIili 2 505 340 Another approach is based on the mineral wool boards being softened by machining one or more of the edge portions. A mineral wool board consists of a very large number of individual fibers of different lengths and diameters. To make the board firm in the sense that in an unaffected state it has a certain shape and retains it, a binder is added. Usually this consists of drops of thermosetting plastic which bind a number of the till brers to each other where they touch each other. A softening can then take place by processing the disc so that some of these bonds are broken.

Examples of such methods are DE G 81 27 196.4 and DE G 81 38 598.6 which show various devices for continuously selecting or missing the home areas of the edge portions.

Thus, DE 32 03 622 describes how to cross and "miss" one or more of your office wires with pressure needles or endless pressure belts. Instead of the rollers or belts, pressure plates can perform the deformation of the edge area or areas.

The patent contains an incorrect reference to the hysteresis character found in a material such as binder-bound mineral wool. It is stated that the processing can be so strong that "the material condition of the fiber bandage lies outside the usual hysteresis loop". Without a definition of the word “übliche”, the term, which is recited in claim 5, is meaningless. However, the nature of the hysteresis is determined by the fact that a mineral wool compressed between two plates, when unloaded to a certain smaller defonation, exerts a lesser pressure on the plates than that required to compress the mineral wool so much.

Of course, this has nothing to do with the problem set forth here or in the patent. The intention is not to reduce the re-pressure of pressure, but the pressure required for compression. In fact, it would probably be the other way around, namely that for each defornation pressure you want the greatest possible re-pressure pressure so that the board inserted between the bars is kept securely even if the bars form part of a roof construction.

Another patent specification in the field is EP 436 681. In this reference is made to DE 32 03 622 and it is stated that this does not give a sufficiently uniform dissolution of the carrier joints. Also in other respects, EP 436 681 contains a technical critique of the invention according to DE 32 03 622.

Instead, EP 436 681 now proposes that the mineral wool sheet be supported and compressed during a rolling process. The rolling itself consists of a large number of deformations, preferably in two 10 15 20 25 30 l L 'll flllll 3 505 340 steps where the number of deformations in the first step should be greater than in the second while the rolling depth should be greater in the second step than in the first.

WO 94/19555 discloses rolling as a method of providing continuous, softer portions in a mineral wool board. However, no further instructions on how to achieve this are given, but it is emphasized that the softened area must be continuous. Measures of the softening depth are also mentioned.

Mineral wool boards have very different abilities to regain their original dimensions after a deformation. This is partly due to the fact that a part of the ema brema has not only been bent but also changed position in the structure. With moderate deformation, it is assumed that these dislocations mostly apply to fi bristles or fi bearing parts that are not fi xdered with binder. At moderate binder contents, it is expected that this applies to most fl esters. With stronger defonation, a number of bonds are also broken. Even bridges that were originally fixed in the structure with binder can then change position.

A machining in order to break the bonds in the ways previously described therefore entails a herbivorous ringing of the structure. This in turn means loss of product volume and a local increase in density. Both of these side effects are not beneficial and are undesirable. The softening methods previously described have all these disadvantages.

The disadvantage of the softening methods thus described is thus that part of the width / length is lost because the mineral wool material is not completely elastic. You then get a residual deformation that is larger the more softly you make the edge portion.

The present invention now makes it possible to soften an edge portion of a mineral wool board so that it can be easily compressed to fit in control compartments which are narrower or shorter than the original dimensions of the board without this softening leaving a significant significant deformation. The invention is based on a careful analysis of the problem, the shortcomings of the proposed solutions and a large number of experiments and measurements.

Essential for the invention has been the study of the structural conditions prevailing in mineral wool boards where fi brema is clearly oriented in the plane of the board.

According to the invention, one or more of the cantilever wires of a mineral wool board are softened by mechanical processing in such a way that processing takes place of a number of discrete portions along the edge while intermediate portions are left unprocessed.

Thereby a satisfactory softening can be achieved without the dimensions of the discs changing significantly. This is because the original dimension is ensured by the unprocessed portions while the intermediate, processed portions are given such a high degree of softening by the partial processing that the total pressure required for a certain deformation of the disc as a whole still becomes acceptable.

Due to the structural complexity of the mineral wool boards, it has not been possible to determine in detail why a discontinuous processing with unprocessed portions is superior to a continuous processing.

For optimal effect, the discs should be compressed during machining. The compaction should be at least 20%, preferably at least 30% and it is rational to carry out the processing after the boards have been stacked and preferably also completely or partially enclosed by a thin packaging material, for example a plastic foil.

The processing is carried out advantageously by pressing elongate forming devices into the edge or edges of the mineral wool boards. These deformers must then be oriented substantially perpendicular to the plane of the discs, which is normally also the discs' own plane.

The baffles have a rounded cross-section and should move substantially perpendicularly in and out in relation to the edge surfaces of the discs.

If two opposite edges are to be machined, this is preferably done simultaneously. the depth of the indentation, and to some extent also the distance between the indentations, depends on the softness sought. In order for the desired type of machining to take place, a certain ratio should be provided between the depth of the indentation and the width of the deforming device so that the ratio is at least 1, preferably at least 2.

It has been found that good results are obtained with 8 - 16 indentations per meter and with deformation devices whose width is less than 80% of the distance between the indentations of the indentations 10 15 20 25 t 'iijjilll 5 505 340 centers. A rounded deformation device with a diameter of 35 mm has proven to work well.

Although satisfactory results are usually obtained with a single treatment, in some cases further defonations may be required. It is then essential that in the second treatment the central part of the unprocessed area of the edge is not affected, but the parts that were processed already in the first round are largely processed.

The invention also comprises a device for carrying out the described method. A particularly suitable device is obtained by joining two or more deformers with a shaft perpendicular to the plane of the discs and the plane in which they are conveyed on any transport device. The shaft must then be at such a distance that the defonation means penetrate to a suitable depth in the edges of the discs and the position of the shaft in relation to the transport device should be easily adjustable.

If two opposite edges are to be machined, this is preferably done simultaneously with two deformation means, one on each side of the transport device.

The invention is explained in more detail with the aid of fi gures 1 - 4, where figure 1 describes a device for practicing the invention and fi gur 2 an alternative embodiment of the deformation means. Figures 3 and 4 show diagrams describing the effect of the invention.

Figure 1 shows a horizontal and a side view of a device for practicing the invention.

In the figure, standard elements irrelevant to the invention, such as drive devices, have been omitted.

The figure shows how a number of packages 1 consisting of a number of mineral wool discs 2 enclosed by a plastic foil 3 are advanced in the direction of the arrows on a conveyor belt 4 which, supported by the rollers 5, runs over the drive roller 6 and the turning mill 7. The horizontal view also shows an upper conveyor belt 8 with its support rollers 9, its drive roller 10 and its reversing roller ll. The upper conveyor belt 8 can be adjusted with a device not shown in the figure so that its distance to the conveyor belt 4 can be varied. Normally it is then set so that the packages, in the uren gure represented by the packages 1, are compressed during the passage between the conveyor belts 4 and 8 as the horizontal view indicates. Conveyor belts 4 and 8 have sarrir speed. Two pairs of deformation means 12A, 12B, 13A and 13B are arranged perpendicular to the plane of the conveyor belts. Each of these consists of a shaft 14 to which two elongate connecting plates, an upper 15 and a lower 16, are attached. Between the plates 15 and 16 rotatably two deformers 17 and 18 run parallel to the shaft 14 and at equal distances therefrom.

The deformation devices consist of metal pipes with a diameter of 35 mm.

The shafts 14 are driven as the pivot arrows show by a device (not shown) so that the peripheral speed of the deformers corresponds to the speed of the conveyor belts 4 and 8.

The shafts 14 are further positioned in relation to the packages 1 which are conveyed between the conveyor belts that, during the passage of the packages past the respective deformation means, they are pressed into the packages.

The distance between the deformers 12A and 13A and 12B and 13B, respectively, is adapted so that the deformers of the deformation means 13A and 13B occupy the packages 1 substantially midway between the places where they are occupied by the deformers of the deformers 12A and 12B, respectively.

In order to be able to process discs in packages of different heights, one can either replace the deformation means with those which have a greater or less effective height or make them adjustable by letting the deformation members consist of fl your parts, telescopically displaceable in relation to each other.

If you want to reduce the distance between the machined parts of the disc edges in order to achieve a more difficult machining without using deeper machining, you can provide each deformation member with a deformation device, eg three, as Figure 2 shows. Connected to the shaft 19 are two three-pointed connecting plates 20 and between them three tubular deformers 21 are fastened.

Figure 3 illustrates the effect of the invention. In the diagram, the vertical axis represents the load to which a mineral wool disc is subjected when it is loaded against an edge with a force. The horizontal axis represents the dimension of the mineral wool board in the direction of the applied force. The diagram should be understood in principle because the relationship between load and deformation varies greatly depending on the degree of orientation, density, binder content, ñberdiarnetes, fiberdiarnet distribution and a andra number of other parameters. 10 15 20 25 4 l .I twflv fl llj 7 5 340 The solid curve A describes the process of a successive deformation of a machined mineral wool board. When the load increases, the def kra- dependence of the defornation also initially increases in order to gradually become almost constant so that the load / defonation curve becomes more rectilinear for moderate loads. The curve A up to the point P represents this, whereby P lies on the part of the curve where the load / deformation relationship is still largely linear.

The point P also represents the degree of defonation required for the disc, according to the invention, to have a certain increased flexibility thereafter.

If the load is now reduced to zero, different processes occur depending on the above parameters, which in this case is the essential thing, depending on the type of deformation to which the edge of the disc is subjected. In the case where the entire edge has been subjected to the pressure and deflated, the relief process follows curve B. This means that each point on curve B below point P gives a lower return pressure than the pressure initially required to effect this deformation. This hysteresis effect is a characteristic feature of all mineral wool boards with normal binder contents. Again fi the pressure of the reduction decreases to zero before the mineral wool board regains its original dimensions. This is represented by point 1. The unloaded disc thus has a residual deformation.

If instead the edge of the mineral wool board is processed with discrete defornations separated by unprocessed parts to the same resilience and then relieved, you get, in a comparative picture, curve C. It has basically the same shape as curve B but leads back to the starting point, point 0, or to a point very close to this, point 2.

The edge machining according to the invention thus leads to a certain increased flexibility of the edge portion with significantly less residual deformation. It has also been found that, as illustrated in Figure 4, the load / deforation curve of the mineral wool board processed according to the invention behaves slightly differently from that of the corresponding board processed in the traditional manner to the same total resilience represented by point R. The machined disc follows a curve M of substantially the same type as an unprocessed disc represented by curve a. A disc machined according to the invention has a steeper beginning, see curve N. This means that, although the disc is as light as a normally machined board can be deformed to accommodate a space smaller than its free dimensions, so it has a greater dimensional stability or stability.

This contributes to a good work performance by reducing the risk of runs and gaps. et 20 25 I 'I “_i1" |' 1 5 0 5 Si fl erbeteckningar i fi guren 1 Mineral wool packages 2 Mineral wool sheets 3 Plastic foil 4 Lower conveyor belts 5 Support rollers for lower conveyor belts 6 Drive roller for lower conveyor belts 7 Turning roller for lower conveyor belts 8 Upper conveyor belts 9 Upper conveyor belts Drive roller for upper conveyor belt 11 Turning roller for upper conveyor belt 12A-B First pair of deformation means 13A-B Second pair of deformation means 14 Shafts in deformation means 15, 16 Connecting plate deformation means 17, 18 Deformation device 19 Shaft 20 Connecting plates 21 Deformation device vr "340

Claims (14)

tï fi I ti * FUN 10 505 340 PATENTKRAV Method of making mineral wool sheets (3) consisting of mineral wool fibers which have been to some extent xered to each other by means of an adhesive, and which sheets have at least a partially softened edge portion, characterized in that discrete deformations are made in the edge portion to be softened when the sheets ( 3) are laid in stack (1) while the portions of the mineral wool sheet between the disrete disc deformations are not deformed. Method according to claim 1, characterized in that the discrete deformations are made when the discs (3) are compressed to at least 20% of their unloaded thickness, preferably at least 30%. Method according to claims 1-2, characterized in that the discrete deformations are made if the mineral wool sheets (3) are completely or partially enclosed by a packaging material, for example a plastic foil (3). Method according to one of the preceding claims, characterized in that the discrete deformations are made with one or more elongate deformations (17, 18; 21), preferably with a convex cross-section on the side facing the mineral wool discs (3), oriented substantially perpendicular to the plane of the disc or discs (3), and which is pressed into the edge portions of the discs. Method according to claim 4, characterized in that the deforming means (17, 18; 21) are pressed against at least one of the edge surfaces of the disc (3) substantially perpendicular thereto and then pulled out substantially along the same path. Method according to one of the preceding claims, characterized in that the processing takes place simultaneously from two opposite hobs. Method according to one of Claims 1 to 6, characterized in that the machining is carried out on at least one of the short ends of the discs. Method according to one of Claims 4 to 7, characterized in that the indentation depth amounts to at least the width of the deformation device, preferably to at least twice the width. Method according to one of Claims 4 to 8, characterized in that the indentation takes place 8 to 16 times per meter with a device whose width is less than 80% of the distance between the centers of the indentations. Method according to one of the preceding claims, characterized in that the processing takes place more than once in substantially the same place. Device for partial deformation of edges of mineral wool boards according to one of Claims 1 to 10, characterized in that! because the device consists of l i t! 1121M11 11 505 340 - one or more rotating deformation means (12A-B, 13A-B), each consisting of - a deformation member (17, 18; 21) connected to a shaft (14, 19) about which it can describe a circular path , - or fl your parallel deforming means (17, 18; 21) connected to a unit which is rotatable about an axis (14; 19), - a transport device (4, 8) for passing mineral wool discs past the deforming means or the deforming means (12A-B, 13A-B), and where the shaft or shafts (14; 19) about which the deformation member or deformation members (17, 18; 21) move are perpendicular to the plane in which the discs are advanced and at such a distance that the deformation member or the deforming means are pressed into the edge or edges of the discs as they are passed past the deforming means or the deforming means. Device for deforming edges of mineral wool boards according to claim 11, characterized in that it has at least one defonation member (12A, 13A and 12B, 13B) on each side of the transport device, preferably arranged opposite each other. Device for deforming edges of mineral wool boards according to claims 11 - 12, characterized in that it has at least two defonation means (12A, 13A and 12B, 13B) on the same side of the transport device and arranged at such a distance from each other that a subsequent defonation means processes the edge portion of the mineral wool board (3) in the same or other places than those processed by the preceding defonation means. Device for deforming edges of mineral wool boards according to one of Claims 11 to 13, characterized in that the deforming means (17, 18; 21) have a circular cross-section and are preferably also rotatable about their axis (14; 19). Fri ”