SK56293A3 - Method of manufacturing insulating boards composed of interconnected rod shaped mineral fibre elements - Google Patents

Abstract

A method of manufacturing insulating boards (25) composed of interconnected mineral fibre lamellae (23) comprising converting a melt of mineral fibre forming starting material into fibres (5), supplying a binder to said fibres, causing the fibres to form a fibre web (8). Formed is also secondary fibre web (14) by duplication of the primary fibre web (8) by laying the layers of the primary fibre web (8) cross to the longitudinal direction of the secondary fibre web (14), then cutting the secondary fibre web in the longitudinal direction to form lamellae (23), cutting said lamellae into desired lengths, turning the lamellae (23) 90 about their longitudinal axis and bonding the fibres together to form boards (25). The bonded lamellae (23) having been subjected to a surface compression followed by a longitudinal compression either before or after the secondary fibre web (14) is cut into lamellae (23).

Description

Method of producing composite insulating waxes

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This w ary is made up of 7 bars composed of bonded rod-like mineral insulating fiber boards of elements

hereinafter referred to as sheets, comprising converting the plaque material in the form of a melt into a mineral fiber, applying a binder to the fiber allowing the fiber to form a fiber structure, cutting the fiber structure in the longitudinal direction into the sheets, cutting the sheets to a predetermined length. 90 ° around their longitudinal axis and their connection to each other to form an i.

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A method for producing said type is explained in Danish patent publication no. 2307577 C3. In this already known method of manufacture, the melt is converted into mineral fibers by centrifugal discharging from one or more fast rotating metering wheels while supplying a binder with curing properties, and the thus treated fibers are retained on the circulating belt in the form of a fiber structure, thereby predominantly directing the fibers. in relation to. surface of this structure. In this already known method, the fiber structure is slit longitudinally into a sheet and the sheets thus formed are rotated 90 ° about their longitudinal axis, the fifth thus oriented being joined together to form an article in the form of a sheet structure which is subsequently cut into board elements. with a specified length. With regard to the rotation of the Piatov duqu brewery finished slabs mostly directed in a plane that is perpendicular to. surface of boards. and as a result, you produce boards having a very high rigidity and. the strength perpendicular to their surfaces, υοΞκν manufactured by ΐνΊΤιΐο in the manner described, are suitable for many uses. but in a specific application such as e.g. exterior home insulation insulation roof and / or façade wkazuiú inadequate here guest or strength and / or vivnostnost.

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It has now been found that these properties can be significantly improved so. that it is a newly produced production. The use of taiTi. Koe aosk.y plucked shade sPOscDora not a n o q n t · a d o ss

1- that the compression of the fibrous are predominantly directed structures, forming in them the use of Piatov, a plane perpendicular to the dramatic surface of the waist of the structure (there will be a surface compression designation in the following) followed by longitudinal compression either before or after cutting. on Plates.

By using a sheet made of a fiber structure that would be subjected to surface compression and longitudinal compression, it is possible to increase the surface strength by 60X compared to plates made of fiber structures that have not been subjected to such a

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The invention is based on the discovery of a structure in the longitudinal direction when the fibers parallel to the surface of the fibrous structure an inner corrugation of the fibers, the corrugation being directed perpendicularly to the longitudinal direction of the fiber structure.

If such a structure is longitudinally cut into sheets and these sheets are rotated and joined by a dobromadv to form sheet plates, each sheet will exhibit a corrugated layer structure, the corrugations being directed perpendicularly to the main surfaces of such plate and plate to impart greater rigidity and strength (sheet strength) of this sheet of sheets, as is the case of sheet of sheets 21, will be eaten from directly guided layers.

Instead of increasing the strength, the applicant may reduce the specific gravity, thereby increasing the insulating ability. In this case, it is well known that mineral wool slabs made up of plates having a droplet content of about 30 X, which droplets are greater than n3 _n m, exhibit an optimum insulating ability at a density of about 40 ka / m *.

It is well known that the relatively coarse mineral fiber structure may be formed directly, i. depositing fibers produced from the melt onto a conveyor belt (see Danish Patent Publication No. 2307577). It is also well known that the fiber structure may be a controlled production of a relatively thin base web. a structure followed by a duplication of this basic structure to form a secondary, relatively thick, structure of the basic structure (see Danish patent publication no.

In the fiber structure, which is turmated directly on the conveyor belt, the fibers are differently directed and guided, but by subjecting the structure to surface compression, the fibers are partially arranged to be predominantly guided in a direction parallel to the surface of the structure.

doubled, the fibers are applied to the belt, i. moving at speed

130 rn / rnin., In the form of a thin fiber layer, i. weighing 0.3 kp / m ² . If the fibers are deposited in this manner, they will be deposited on

If the fiber bond is in a wide range of conveyor belts

A parallel to the surface of the structure and predominantly parallel to the direction of belt travel. As a result, the fiber structure acquires a tensile strength that is less than or equal to the tensile strength.

a. R The secondary fiber structure is formed by depositing a thin base structure in a number of layers, for example 20, with pendulum belts, mainly transversely to the longitudinal direction of the secondary layer, the number of layers being determined by the desired basis weight of the secondary structure.

In the double structure, the fibers are predominantly directed transversely to this structure, because the layers of the base structure are directed transversely to the secondary structure.

G b yy targets of fiber yarn. r y is secondary. a structure having a relatively large thickness; and. low extensiveness in both length and length.

In the process of the invention are yyroby preferred Valid only zovojenej formed from a fiber structure containing the layers 4 and it has a weight povrcnovti οα 1-8 kA / ^M: where m rozrexaní around the fibers in the plane of the

Extremely high compression stiffness is the plates made of Plates of a spun secondary structure. Which sd subsequently rotated 90 ^J longitudinal as well as axes, because predominantly transversely directed relative to. secondary structure will be located perpendicular to the rear aosanovaná U A NVM dosky.Stlačením viaKnovei structure in the length direction before the rotation of the plates 9U ^account the strength of the finished sheet is compressed in the en you have and on the increase and visiting spoil the T / MTO zvvsením down the strength of the . they mutually support each other, as is evident from the fact that both of these values obviously bring about a final effect that is more significant than a few effects brought by these values but separately.

Methods of squeezing fiber structures are known per se. in a preferred already known method, i. in Swiss patent specification no. 620861, the mineral fiber structure is introduced into the space between two parallel conveyor belts that circulate at a speed V a. subsequently into the space between two other conveyor belts which circulate at a speed V->, wherein this speed V-z is lower than the speed V 1. Depending on the relation between v-> and Vp, the fiber structure is compressed more or less longitudinally. The relationship between V-ι. and V c is selected such that the corrugation of the fibers is produced by this longitudinal compression, the corrugation of the direction being transverse to the longitudinal direction of the structure. In another preferred method, i. j. U.S. Pat. 2,500,690, the longitudinal compression is achieved by means of a series of cylindrical assemblies, wherein these cylinders rotate at a rate that decreases the fiber structure.

Longitudinal compression of the fiber battens is preferred, but the longitudinal direction of the structure prior to cutting into longitudinal compression may be performed even after cutting the structure into sheets.

For use in the production method of the invention are.

preferred sheets made of fibrous structures, which are both bv1 and wavelength shields in a ratio of 1.5: 1 and 4: 1.

As noted, the longitudinal compression should be performed following vertical compression and, when using a thermosetting binder, the longitudinal compression is performed prior to introduction of the fiber structure into the curing oven.

Methods for the compression of surfactant compression are also known in the art. In the aforementioned methods, the fiber structure to be squeezed is introduced into the space between the rollers in a series of roller assemblies, the distance between the rollers in these roller assemblies gradually decreasing in the direction of movement of the fiber structure.

in the vvrooy method according to the invention, the fifth part of the method is compressed in a ratio of 3: 1 to I.s.

Cutting the fiber structure into sheets is preferably accomplished by means of saws, which may take the form of compass saws (see Danish Patent Publication No. 2307577) or circular saws (see published patent application SE No. 441764 and Danish patent publication No. 2032624). ).

the preferred process of the process according to the invention is. rod-like fiber elements cut to lengths before rotation by 90 ° and assembled into plates. Such rotation can be achieved e.g. following displacement of the cut sheets from the respective conveyor belt so as to be displaced in the longitudinal direction to another conveyor belt that moves perpendicular to the previous belt, resulting in conveying the sheets in a direction perpendicular to said longitudinal direction.

Such an arrangement is advantageous when the apparatus used for this method of rotating the sheets requires little space.

Alternatively, the rotation of the sheets may be performed to cut the structure into sheets, such as explained in Danish patent publication no.

Suitably directed sheets, sheet plates, may be attached to the binder means, which fiber structure and optionally may be suitable for cutting the sheet into sheets.

2307577 or DE 2032624, which are intended to be bonded to each other, preferably applied to the top. side to its bottom, which is

However, it is not necessary to add additional binder, since the binder material which is applied to the fibers in connection with their forming is also present on the surfaces of the sheets and may be sufficient to bond together these sheets if they are perfectly pressed together during curing of the binder in the curing. Furnaces (see Danish patent No. 3526/75).

If the heat-curing binder is applied in connection with their formation and if a heat-curing binder is used for the purpose of bonding the sheets, then the binder may be cured once by transporting properly oriented and arranged sheets through a curing oven in which they are heated. a temperature which conveniently ranges from 210 to 260 ° C when the phenol form of the aldehyde resin is used as the binder. Binder for bonding the sheets can also be applied after the fiber structure / sheet 2 has been cured in a curing oven. s the aim of the creation of the .1 and k s in connection with their creation.

After curing in the oven, binders other than the heat curing binders may also be applied.

An embodiment of the invention

The invention will now be described in more detail with reference to a single drawing, which schematically illustrates a line for implementing a manufacturing method in accordance with the invention.

In the drawing, reference I shows the furnace for. preparing a melt for the production of mineral fibers, wherein the melt is fed to a metallizer 3 provided with four fast rotating metering wheels. 4 through the melt outlet 2. At the same time as the melt is introduced onto the outer surface of the scooping wheels and the binder is sprayed, a strong gas flow passes around the scooping wheels in the axial direction, directing the deposition of fibers sú applied to the orbiting perforated conveyor belt 6 guided by three rollers Z, one is propelled by propellants (not shown). As a result of this stage of manufacture, the fiber structure S (base structure) is formed and this structure is embedded in the space between the two pendulum belts 1.Ω and i., 1. p o m o c o o r o s t i e d i e n i i n o o n i i n o. to pass it on. The lower end of the Kyvaol passports is pivoted in a direction perpendicular to the direction

Have you ever considered the conveyor belt 1.2, which is guided by the two rollers 1.3, when one is in no hurry? by means of the means shown).

The swivel range of the lower part of the pendulum belt corresponds to the width of the conveyor belt 12 and the double fiber structure formed therefrom

1.U and 1.1 is on the strip of often overlapping fiber layers Q.

The fibrous printing layer is adjacent to the surface of the webs of the cylindrical assemblies 1,5,26,12, which in the cylinder assemblies gradually decreases in the longitudinal direction of the fiber structure. Then there is a fiber bond. 14 is introduced into a longitudinal compression section, which also consists of three roller assemblies 1, 1, 2, 2, 20, wherein the rollers of these roller assemblies rotate at the same speed which is lower than the speed of the roller assemblies 15, 16, 12.

the fiber structure which has been longitudinally compressed is further embedded in a curing oven 21 in which it is heated to a temperature that is sufficiently high to cure the binder and from the three co-operating spacing of the rolls to each other. himself,

After passing through the curing oven, the heat treated fiber structure 1.4 is cut longitudinally by means of saws 22 to form sheets 25, which are subsequently cross-cut by means of a cross-saw 24. The cut sheets 25 are then rotated 90 ° and arranged to form a plate. element 25 on. and at the same time a binder is applied to the contact surfaces by means of a coating device (not shown) in order to join the sheets 25 together.

As can be seen from the drawing, the fiber layers formed from the base structure 10 are directed perpendicularly to the surface of the final board member and, if they are also corrugated, exhibit high compression resistance.

In addition to gluing, the sheets may be joined together by means of e.g. Tapes, strings, bewoven fabric or paper on one or both sides of the boards.

Claims (1)

P A T E N T O V E Process for producing insulating board elements composed of bonded mineral fiber fibrous elements comprising converting a base feedstock into fibers, applying a bonding agent to said fibers allowing said fibers to form a fiber structure, cutting said fiber structure in a longitudinal direction onto the sheet, cutting said Plates according to J turning said sheets about their longitudinal axis and joining them together to form an aoskv, which implies the use of sheets that are. subjected to downward compression followed by longitudinal compression either before or after cutting the fiber structure into sheets. The method of claim 1, characterized in that. that it uses sheets made from a double fiber structure. Method according to claim 1 or 2, characterized in that it utilizes a coating which is longitudinally compressed in a ratio of from 1.3: 1 to 4: 1, The method according to claim 1, 2 or 3, characterized in that it utilizes sheets which have a surface compression in a ratio of from 3: 1 to about 1 to about 1. The method of any of claims 1 to 4, important uj formula I _P at characterized in that the fibrous web was cut into sheets of a given length before being turned 90 ° and the assembly of plates in grade. A method according to any one of claims 5 to 5 and comprising applying a heat-curing binder to the fibers, characterized in that the surface compression and the lateral compression are performed before subjecting the fiber structure to a heat treatment to cure the binder.