WO2013102592A1

WO2013102592A1 - Device and method for producing a mineral wool fibre part

Info

Publication number: WO2013102592A1
Application number: PCT/EP2012/076716
Authority: WO
Inventors: Roland Karle
Original assignee: Groz-Beckert Kg
Priority date: 2012-01-03
Filing date: 2012-12-21
Publication date: 2013-07-11
Also published as: DE102012100025A1

Abstract

The invention relates to a device (10) and a method for producing a mineral wool fibre part (11). A melting device (12) produces a mineral molten mass (S) from mineral starting substances. Said molten mass is fed to a chamber (13) of a centrifuge device (14). The chamber has a circularly annular circumferential side or circumferential wall (15), in which fibre outlet openings (16) are arranged distributed in the circumferential direction. When the centrifuge device (14) is rotated, the molten mass is pressed through the fibre outlet openings (16), as a result of which mineral fibres (22) are formed. The mineral fibres (22) are admixed with plastic fibres (30) to produce a laid fibre fabric (31). A melt-blowing device (28) serves for this purpose, the arrangement and/or plastic-fibre ejection direction of which is fixed in such a way that the plastic fibres (30) and the mineral fibres (22) are admixed to produce a fibre mixture and can form a laid fibre fabric (31). Said laid fibre fabric (31) is processed by a connecting device (35), wherein the plastic of the plastic fibres (30) is activated and this results in a material-to-material connection between the plastic fibres (30) and the mineral fibres (22). According to the invention, no fluidic bonding agent is used.

Description

Device and method for producing a mineral wool fiber part

The invention relates to a device and a method for producing a mineral wool fiber part, in ^¬ example, a mineral wool fiber mat. The mineral wool ^¬ fiber part is preferably designed as a resilient and bendable mat. It is also possible to perform the Mineralwollefa ^¬ serteil as solid inherently stable body, which for example forms a plate.

Such mineral wool fiber parts are used for example as insulation materials for heat and / or sound insulation.

EP 0 577 808 B1 discloses an apparatus and a method for producing a mineral wool felt. The mineral wool ^{fleece is being} needled by the action of force. For this purpose, an additive is added to the mineral wool fibers in order to achieve improved needling. For this purpose, for example, a thixotropic additive can be supplied. It is also known to add a second fiber to a rock wool fleece in order to achieve improved entanglement between the rockwool fibers and the additional fibers during subsequent needling.

DE 10 2010 015 575 A1 describes a process for producing a mineral wool fiber mat which preferably emits no or very little formaldehyde. In this document management ^¬ a variety of possible binders for connecting the mineral wool fibers are described.

An apparatus for producing mineral fibers is from EP 2 165 984 AI and EP 1 856 002 Bl. A spinning device rotatable about a rotation axis is supplied with a mineral melt. When the rotation of the Schleu ^¬ dereinrichtung the mineral fibers occur on the peripheral side by fiber outlet openings. In the area of the fiber outlet openings, a gas stream directed parallel to the axis of rotation is produced, which carries the mineral fibers in the flow direction.

The processing of mineral fibers into a mineral wool fiber part is difficult. When needling the mineral fibers, it is necessary to add a processing additive to prevent breakage of the mineral wool fibers. The additive makes the mineral fibers smoother. This is complicated and expensive. Although blending the mineral fibers with other fibers before needling may result in better hold of the produced mineral wool fiber part, breakage or tearing of the mineral fibers during needling can not be prevented thereby. It has been shown that feeding ei ^¬ nes fluid additive for satisfactory results is not ^¬ agile.

Instead of a mechanical needling, the mineral fibers produced can also be sprayed with a binder and then bonded together by the action of heat. Spraying the mineral fibers with a binder entails environmental problems. Often a part of the binder does not get to the mineral fibers and is carried in a gas stream to the exhaust air. There filter devices must be arranged to clean the exhaust air. Many binders also contain formaldehyde. The transpiring of formaldehyde from the produced mineral wool fiber part can also bring health impair ^¬ conditions with it, for example when the mineral ralwollefaserteil is used in buildings as insulating material.

It is therefore an object of the present invention, an apparatus and a method to create, which avoids the mentioned disadvantages and enables a simple and environmentally friendly production ^¬.

This object is achieved by a device having the features of claim 1 and a method having the features of claim 9.

According to the invention, a mineral melt is produced via a melting device. This mineral melt is then fed to a chamber of a spinner. The spinner is rotatably mounted about a rotation axis. Are ver ^¬ shares several fiber outlet openings arranged on the peripheral side of the chamber. Upon rotation of the spinner, the melt is forced away from the axis of rotation to the fiber exit openings where mineral fibers form on exiting the fiber exit openings.

In addition, there is a meltblown device by means of which plastic fibers are produced. The meltblowing apparatus is adapted to bring together the manufactured synthetic fibers and the mineral fibers and to form a fiber fabric containing both mineral fibers and synthetic fibers. This fiber fabric is then connected in a connecting device without supplying additional fluidic binder to the Mineralwollefa ^¬ serteil. The connecting device activates the plastic or a plastic component of the plastic ^¬ fibers, for example, heat generated in the fiber ply, where ^¬ with a cohesive connection between the Art Fabric fibers and the mineral fibers is formed. The plastic fibers preferably have a hot melt adhesive property for this purpose. The KunstStofffasern serve as Vernetzungsfa ^¬ sern in mineral wool fiber part.

The device ^according to the invention or the method ^according to the invention therefore requires no fluidic binding agent. As a binding element between the mineral fibers are the plastic fibers that form a cohesive or an adhesive bond with each other and with the mineral fibers. The term plastic fiber is to be understood herein any fiber that is at least partially made of plastic, wherein the plastic material during its activa tion ^¬ undergoes a metallurgical joint with adjacent fibers by the connecting means. The activation of the plastic material takes place without the use of mechanical ^¬ rule needles or needle-like fluid jets which penetrate into the fiber fabric. The joining is thus carried fiber ^¬ gently. The activation of the plastic in the art ^¬ fibers to form the bonded connection is preferably effected by the action of a shape- or formless radiation, for example an ultrasonic radiation, infrared radiation, thermal radiation, ultraviolet radiation or the like on the fiber fabric. Alternatively or additionally, the fiber fabric may also be pressurized. Also by the pressure, the particle movement is increased in the plastic of the plastic fibers, whereby the plastic for producing the cohesive connection can be activated.

It is also advantageous if the centrifugal device is assigned a flow-generating device which generates a gas flow which flows approximately parallel to the axis of rotation and carries the mineral fibers to a deposition surface. Starting from the spinner The generated mineral fibers are therefore transported by the gas flow in a common direction to a storage area.

In a particularly preferred embodiment of the invention, the Kunststofffasern produced by the melt blowing device are introduced into the gas stream, resulting in a good mixing of the mineral fibers with the Kunststofffasern. In particular, the

Melt blowing device for this purpose, a plurality of melt-blowing nozzles, which are arranged distributed uniformly around the axis of rotation. Preferably, the meltblowing dies in the direction of the axis of rotation seen in approximately level with the Schleu ^¬ dereinrichtung. In this case, the outlet direction of the

Schmelzblasdüsen be selected obliquely or radially to the axis of rotation. In this way it can be prevented that the mineral fibers emerging at the fiber outlet openings pass transversely through the gas flow. The flow generated by the meltblowing dies can counteract the radial movement of the mineral fibers and co-direct the plastic fibers and mineral fibers into the gas stream.

Advantageous embodiments of the invention will become apparent from the dependent claims and the description. The description is limited to essential features of the invention and other conditions. The drawing is to be used as a supplement. Hereinafter, embodiments of the invention will be explained in more detail with reference to the drawing. Show it:

1 is a schematic block diagram similar Dar ^¬ position of a first embodiment of an apparatus for producing a mineral wool fiber part and

2 is a schematic block diagram similar Dar ^¬ position of a second embodiment of a Vorrich- tion for producing a mineral wool fiber part.

In Figures 1 and 2, a Ausführungsbei ^¬ play an apparatus 10 is shown for producing a mineral wool fiber portion 11, respectively. The device 10 has a melting device 12 for producing a mineral melt S. As raw materials for the production of

Melt S different materials and Materialge ^¬ mixtures can be used, depending on whether, for example, glass wool fibers or rock wool fibers are to be produced. For glass wool fibers, a high proportion of waste glass can be used. For the production of rockwool fibers, the mineral melt S may contain starting materials such as latex and / or dolomite and / or basalt and / or diabase and / or anorthosite and / or recycling materials.

The mineral melt S is supplied in its liquid or viscous state of a chamber 13 of a spinner 14. The spinner 14 is rotatably mounted about a rotation axis D. In the circumferential direction about the axis of rotation D, the chamber 13 is bounded by a peripheral wall 15 with a plurality of fiber outlet openings 16. The fiber outlet openings 16 are arranged in the preferred embodiments in the circumferential direction in particular evenly distributed. Upon rotation of the spinner 14 about the axis of rotation D located in the chamber 13 melt S is pressed away from the axis of rotation D radially outward to the fiber outlet openings 16 and passes through them out of the chamber 13 to the outside. At ^¬ mineral fibers 22 are formed.

In the preferred embodiments described herein, the apparatus 10 further includes a flow generating device 20 which generates a gas flow G radially adjacent to the fiber exit ports 16. For this purpose, the flow-generating device 20 has a plurality of flow nozzles 21, which are arranged in the circumferential direction about the rotary axis D are arranged distributed. The gas flow G is oriented at ^¬ game according parallel to the axis of rotation D and is used to take and exiting from the fiber outlet openings 16 Mineral fibers 22 to be transported to a storage area 23rd The storage surface 23 is provided in the embodiment of a transport device 24 and according to a conveyor belt 25, for example.

The gas stream G may be heated so that the austre ^¬ mineral fibers 22 remain malleable. The gas stream G may have temperatures in the range of 200 ° C to 300 ° C.

In order to prevent the emerging from the Faseraustrittsöff ^¬ voltages 16 Mineral fibers 22 intersect the flow of gas G and are not entrained by the gas stream, for example according to generate a radially or obliquely to the axis of rotation D directed towards the counter-flow F, which is preferably formed by an air stream. The countercurrent F is aligned so that it meets from the outside radially at the points of the gas flow G, where the mineral fibers 22 enter from inside into the gas stream G.

In the first embodiment of the apparatus 10 ge ^¬ Mäss Fig. 1, the counter-flow F is generated by a meltblowing ^¬ device 28. The melt blowing device 28 has a plurality of melt blowing nozzles 29 preferably distributed regularly in the circumferential direction about the axis of rotation D. The melt blowing device 28 is used to generate

Plastic fibers 30. They are introduced to the countercurrent F into the gas stream G and mix with the mineral fibers 22. The gas stream G transports the Faserge ^¬ mixture of plastic fibers 30 and mineral fibers 22 to the shelf 23 on the support surface 23 results in a Fa ^¬ sergelege 31, which consists of a mixture of mineral fibers 22 and 30 Kunststofffasern. The fiber web 31 is transported by means of the transport ^device 24 to a connecting device 35. The connecting device 35 is adapted to produce a material-locking connection between the KunstStofffa ^¬ sern 30 and the mineral fibers 22. In this case, no additional binder and in particular no zusätz ^¬ pending fluidic binder is used. The stoffschlüs ^¬ sige connection is made by activating the in the embodiment of hot melt adhesive having plastic of the plastic fibers 30. To activate this plastic, the connecting device 35 generates a ge ^¬ staleless radiation, which acts on the fiber fabric 31. This formless radiation can be, for example, an infrared radiation and / or an ultrasound radiation and / or an ultraviolet radiation and / or a microwave radiation and / or another suitable, in particular electromagnetic radiation.

It is also alternatively or additionally possible to activate the hot-melt adhesive properties of the plastic of the synthetic material fibers 30 by applying pressure to the fiber layer 31. Heat is preferably generated in the fiber layer 31, as a result of which the hot-melt adhesive properties of the plastic fibers 30 are activated and a cohesive connection in the fiber layer 31 is established. The Ver ^¬ inhibiting means 35 may further comprise rolls or similar urging means for shaping, in order to bring to a desired shape, the mineral wool fiber part produced. 11 Following the connection device 35, the mineral wool fiber part 11 can also be cut to size.

In the first embodiment, the melt ^{blowing device} 28 is approximately at the level of the spinner 14 arranged, so that the mineral fibers 22 and the synthetic material ^¬ fibers 30 are introduced into the gas stream G in about the same place. At the same time, the melt ^blowing device 28 generates the countercurrent F. In contrast to this, in the exemplary embodiment according to FIG. 2, a blower 36 for generating the countercurrent F is present. The fan 36 is arranged at a distance opposite the Faseraustrittsöffnun ^¬ gene 16. In this embodiment, the counterflow F is aligned radially to the axis of rotation D. The blower 36 may include a plurality of blower units distributed circumferentially around the axis of rotation D so that a sufficiently large counterflow F is generated at each circumferential location. As in the first embodiment ^¬ example, the counterflow F serves to hold the emerging from the fiber outlet openings 16 mineral fibers 22 in the gas stream G, so that it can transport the mineral fibers 22 to the storage surface 23.

The melt blowing apparatus 28 is oriented in the second embodiment in that the plastic fibers 30 by the of the at least one meltblown die 29, he testified ^¬ air flow to be transported directly to the storage surface 23rd For example, the melt blowing device 28 can be arranged within the circular cylinder defined by the peripheral wall 15 of the centrifuging ^device 14 between the centrifugal device 14 and the depositing surface 23. In this arrangement, the plastic fibers are arranged 30 between two layers of mineral fibers 22 and connect them by subsequent action of the connecting means 35 to the fiber fabric 31 as described in connexion with ^¬ to the first embodiment.

It is understood that even in the first embodiment ^¬ example for generating the counterflow F, a fan 36th can be provided.

The invention relates to a device 10 and a method for producing a mineral wool fiber part 11. A melting device 12 generates a mineral

Melt S from mineral starting materials. This melt is fed to a chamber 13 of a spinner 14. The chamber has an annular peripheral side or circumferential wall 15, are arranged distributed in the fiber outlet openings 16 in the circumferential direction. Upon rotation of the spinner 14, the melt is forced through the fiber outlet openings 16, whereby mineral fibers 22 form. The mineral fibers 22 are mixed with plastic fibers 30 to a fiber fabric 31. This purpose, a melt blowing device 28 whose arrangement or plastic fiber ejection direction is set so that the Kunststofffasern 30 and the mineral fibers 22 mix to a fiber mixture and can form a fiber fabric 31. We processed this fiber fabric 31 by connecting means 35, wherein the plastic of the plastic fibers is activated 30 and 30 and this results in a cohesive Ver ^¬ bond between the plastic fibers of the mineral fibers 22nd According to the invention, no fluidic binder is used.

Reference sign list:

10 device

11 mineral wool fiber part

12 melting device

13 chamber

14 centrifugal device

15 peripheral wall

16 fiber exit openings

20 flow generating device

21 flow nozzle

22 mineral fibers

23 shelf space

24 transport device

25 conveyor belt

28 melt blowing device

29 melt blowing nozzles

30 synthetic fibers

31 fiber scrims

35 connection device

36 blowers

D rotation axis

F counterflow

G gas flow

S mineral melt

Claims

Claims:

1. Apparatus (10) for producing a mineral wool fiber part (11), comprising a melting device (12) for producing a mineral melt (S), with a about a rotational axis (D) rotatable centrifugal device (14) having a chamber (13) in which the melt (S) is fed and which has on its circumferential side (15) fiber outlet openings (16) from which mineral fibers (22) emerge when the spinning device (14) rotates, with a melt blowing device (28) for production plastic fibers (30) is used, and which is adapted to mix the plastic fibers (28) and the mineral fibers (22) and thereby forming a batt (31) of mineral fibers (22) and KunstStofffa ^¬ fibers (30), with a Connecting device (35), which acts on the fiber fabric (31) of mineral fibers (22) and plastic ^¬ fibers (30) and the Kunststofffasern (30) with the mineral fibers (22) without supplying additional fluid binder cohesively connects.

2. Device (10) according to claim 1,

characterized in that the spinner (14) is associated with a Stromungserzeugungseinrichtung (20) which generates an approximately parallel to the axis of rotation (D) flowing gas stream (G), which carries the mineral fibers (22) to a storage surface (23).

3. Device (10) according to claim 2,

characterized in that the melt blowing means (28) introduces the plastic fibers (22) into the gas stream (G).

4. Device (10) according to one of the preceding claims,

characterized in that the melt blowing device (28) seen in the direction of the axis of rotation (D) is arranged approximately at the level of the spinner (14).

5. Device (10) according to one of the preceding claims,

characterized in that the melt blowing device (28) ejects the KunstStofffasern (30) obliquely or radially to the axis of rotation (D) out.

6. Device (10) according to one of the preceding claims,

characterized in that the connecting means (35) generates a shapeless radiation which connects the KunstStofffasern (30) with the mineral fibers (22).

7. Device (10) according to one of the preceding claims,

characterized in that the connection means (35) generates heat, which leads to the compound of the art ^¬ fibers (30) with the mineral fibers (22).

8. Device (10) according to one of the preceding claims,

characterized in that the connecting means (35) on the fiber fabric (31) exerts a pressure.

9. A process for producing a mineral wool fiber part (11), comprising the following steps:

Production of a mineral melt (S),

Feeding the melt (S) to a chamber (13) of a spinning device (14) rotatable about a rotation axis (D), the chamber (13) having fiber outlet openings (16) on its peripheral side (15),

Turning the centrifugal device (14) to produce mineral fibers (22) at the fiber outlet openings (16),

Producing artificial fiber (30),

- forming a fiber fabric (31) from the mineral fibers (22) and the Kunststofffasern (30),

- Material connection of the KunstStofffasern (30) with the mineral fibers (22) in the fiber fabric (31) without supplying additional fluid binder.