CA2077241A1 - Apparatus for the production of wool, in particular rock wool, from a melt - Google Patents
Apparatus for the production of wool, in particular rock wool, from a meltInfo
- Publication number
- CA2077241A1 CA2077241A1 CA 2077241 CA2077241A CA2077241A1 CA 2077241 A1 CA2077241 A1 CA 2077241A1 CA 2077241 CA2077241 CA 2077241 CA 2077241 A CA2077241 A CA 2077241A CA 2077241 A1 CA2077241 A1 CA 2077241A1
- Authority
- CA
- Canada
- Prior art keywords
- blast nozzle
- diffuser
- wool
- melt
- designed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/06—Manufacture of glass fibres or filaments by blasting or blowing molten glass, e.g. for making staple fibres
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
- Inorganic Fibers (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
Gr?nzweig + Hartmann AG
6700 Ludwigshafen, DE
Abstract 1. An apparatus for the production of wool, in particular rock wool, from a melt.
2.1. In the case of prior apparatus for the production of rock wool from a melt, the blast nozzle and the impact diffuser to which it is connected and which is designed as a separate part, undergo considerable wear owing to fibre contact occurring at the wall, so that these components have to be replaced at regular intervals.
2.2. According to the invention, at least the first stage (13) of the impact diffuser (11) is designed as a single piece incorporating the blast nozzle (6).
2.3. Production of rock wool.
3. Fig. 1.
6700 Ludwigshafen, DE
Abstract 1. An apparatus for the production of wool, in particular rock wool, from a melt.
2.1. In the case of prior apparatus for the production of rock wool from a melt, the blast nozzle and the impact diffuser to which it is connected and which is designed as a separate part, undergo considerable wear owing to fibre contact occurring at the wall, so that these components have to be replaced at regular intervals.
2.2. According to the invention, at least the first stage (13) of the impact diffuser (11) is designed as a single piece incorporating the blast nozzle (6).
2.3. Production of rock wool.
3. Fig. 1.
Description
Grunzweig + Hart~ann AG P 862 6700 Ludwigshafen, DE
'1 Apparatus for the production of wool, in particular rock wool, from a melt The invention relates to an apparatus for the production of wool, in particular rock wool, from a melt in accordance with the preamble of claim 1.
In the blast drawing process, primary filaments emerging from, as a rule, a row of exit orifices of a melt distributor, are fed into the drawing gap of a blast nozzle and are accelerated and thus pre-drawn in a gas flow which likewise enters the drawing gap. Downstream of the blast nozzle exit, the thus formed gas-fibre dispersion has to be decelerated, and the static pressure of the gas flow raised to approximately ambient pressure, in order to be able to deposit the fibres which have solidified on cooling to form, eventually, a nonwoven fabric. In this connection, it is known, for example, from published German patent application ~E-OS 38 07 420 that a subsonic diffuser is employed for deceleration in the form of a so-called impact diffuser with at least one sudden widening of the cross section of the flow boundary. This has the effect that the fibre and/or fibre-gas dispersion, downstream of the sudden widening of the cross section, undergoes a relatively pronounced degree of expansion, so that the mutual clearance between the filaments of the fibres is increased and the probability of their coming into contact with one another is minimised. Downstream of the sudden widening of the cross section, so-called impact eddies are formed on both sides in the backflow zones, said impact eddies forming, in technical flow terms, the boundary of the main flow. Direct wall contact of filament constituents is thus avoided in the region of the impact eddies by virtue of the fact that the flow boundary is formed by another flow and not by the solid wall.
Owing to the fibre contact which thus occurs, and the accompanying thermal loading, the walls of the blast nozzle undergo wear cO that the blast nozzle has to be replaced at regular intervals. Although the blast nozzle may, for the purpose of increasing its service life, be manufactured from pure nickel or from high-alloy, wear-resistant steel, whereby in the last-mentioned case a cooling arrangement for the side walls has had to be added to further extend service life, the disadvantage nevertheless remains that the impact diffuser arranged below the blast nozzle as a separate part is likewise subject to considerable wear, at least in the upper region, i.e. in the region of the first stage of the impact diffuser, owing to the fibre contact which occurs at the wall there, so that the impact diffuser also wears out at regular intervals and has to be completely replaced by a new impact diffuser.
The object of the present invention is to combat this problem through the characterising features of claim 1.
By designing the blast nozzle as a single-piece component with the first stage of the impact diffuser, an approach which initially appears to contradict functional requirements, the situation is created whereby the parts of the fiherisation unit which undergo the most wear and tear can be replaced as a whole.
As claimed in claim 2, for the purpose of increasing service life the first stage of the impact diffuser, designed together with the blast nozzle as a single piece, is manufactured from the same material, for example a high-alloy, wear-resistant steel.
As claimed in claim 3, the service life of the wearing parts can be further extended to good advantage by cooling the side walls of the blast nozzle and/or the impact diffuser by means of cooling ducts which are swept by a coolant.
3 ~ )~"~
In a particularly advantageous further development of the invention, the blast nozzle is designed, as claimed in claim 4, in the form of a so-called flat-land blast nozzle.
Further details, features and advantages of the invention are revealed in the following description of an embodiment by reference to the drawing in which ig. 1 shows in schematically simplified form a section through an appliance according to the invention for the fiberisation of mineral fibre melts, with a blast nozzle and the first stage of an impact diffuser, and with further stages of the impact diffuser, and ig. 2 shows in a representation essentially similar to that of Fig. 1, a modified embodiment with a so-called flat-land blast nozzle.
As is apparent from Fig. 1, melt, in the illustrative example mineral melt, is fed from a melting tank, not depicted in any further detail, to a distributor tank, signified by 1, which is manufactured from platinum, emerging in the present embodiment in the form of a plurality of adjacently arranged primary filaments from exit orifices 2 of the distributor tank 1. For reasons of clarity, the melt itself is not depicted. The exit orifices 2 arranged in a row exhibit in the embodiment a diameter of approx. 1 to 2 mm and are spaced at intervals of approx. twice the orifice diameter. These dimensions may, however, be modified upward or downward depending on the melt. The exit zone of the distributor tank in the present case is heated by hot combustion gases 3, these latter passing through a narrow gap 4 on both sides of the exit zone of the distributor tank 1 at high velocity and enveloping the divided flows of melt in the zone where formation and movement of the primary filaments takes place. The mass flow of melt per exit orifice is determined by the temperature and the geostatic pressure of the melt, the orifice 2~r,9~
diameter and the level of static partial vacuum in the exit plane of the orifices 2. This partial vacuum is generally generated by injection of a blown medium 5 through nozzle orifices, said blown medium being supplied to a blast nozzle unit, generally signified by 6, and entering through, in the present embodiment, slit-like nozzle orifices 7 in the upper region of a nozzle slot 8 of the nozzle unit. The injection of the blown medium 5 through the blow-in slits 7 takes place on both sides of the nozzle slot 8 in a pattern which is essentially wall-parallel or parallel to the centreline 9 of the blast nozzle units 6. In this process, the pre-drawn primary filament in the suction zone is excited such that it oscillates in a direction transverse to the main flow direction, is entrained by the rapid wall jets and is further accelerated and drawn. The flow velocity of the drawing gas streams, which are composed of the actual blown medium 5 as the propellant, the sucked-in hot combustion gases 3 and the ambient medium (secondary air) depicted at 10, and which can easily assume supersonic speed in accordance with the converging-diverging contour of the blast nozzle units 6, is reduced in a downstream subsonic diffuser 11. The narrower the subsonic diffuser 11, the finer, and also shorter are the fibres obtained.
The point at which the flow leaves the subsonic diffuser 11 generally marks the end of the fibre formation process. Normally the fibre-air dispersion is then further decelerated and cooled in the chute with the addition of coolants, sizing/slashing agents, binders and/or further conditioning means, and also with further false air being sucked in. The fibres are deposited in the form of a wool non-woven fabric on a perforated accumulating conveyor located below, and are separated from the drawing and entrained gases (process air) by vacuum chambers with downstream fans arranged below the accumulating conveyor.
The subsonic diffuser 11 is designed as an impact diffuser with, in the present illustrative embodiment, three stages 13, 14 and 15 within its flow boundary, with sudden inward or outward changes in cross section, 16, 17 and 18. The customary single or multiple impact diffusers, which are known per se, are characterised by the fact that the main flow at those points where there is a sudden widening of the cross section breaks down and only returns to the solid flow boundary after a certain flow length over which a backflow zone is formed. The higher the number of stages 13, 14 or 15, the better is the efficiency with which dynamic pressure energy is converted into static pressure energy.
In the case of the apparatus according to Fig. 1, the individual inward or outward changes in cross section 16, 17, 18, and the length of the individual stages 13, 14 and 15 can be dimensioned such that the melt and fibre constituents, which follow the drawing gas flows with a certain degree of slippage, only come into contact with the solid flow boundary at the end of each stage, with any wall contact occurring virtually parallel to the wall, thus resulting in the melt filaments only being exposed to insignificant deceleration and cooling phenomena with ensuing bead formation.
The length of the individual stages 13, 14 and 15 should be selected such that, in the stage exit-plane, no further backflow zones are formed, as these can lead to large-volume flows which are mostly unstable and have as their consequence a non-uniform fibre flow pattern. From this point of view, the preferred minimum length of the stages 13, 14 and 15 is approximately 5 to 6 times the difference of the roots of the respective exit and entry cross sections of each stage 13, 14 and 15.
With respect to further details, features and advantages of the impact diffuser 11, express reference is made to printed German patent application DE-OS 38 07 42Q of the present assignee, filed on the same day, the full contents thereof being hereby incorporated by reference.
6 ~ 7~
According to the invention, provision is now made for those parts which, owing to the fibre material impinging on the wall and the thermal loads associated therewith, undergo the most wear, i.e.
the blast nozzle unit 6 and the section corresponding to the first stage 13 of the impact diffuser 11, to be designed as a single-piece component which can be completely replaced if required.
As shown in the drawing, the walls of the nozzle slot 8 of the blast nozzle unit 6, and the subsonic diffuser 11 feature cooling ducts which are individually and severally signified by 19.
These result in intensive cooling of the flanks of the nozzle slot 8, and/or of the solid flow boundary of the subsonic diffuser 11. As a result of the cooling of the surfaces which are directly involved in heat exchange with the fibre dispersion, operational reliability is increased on the one hand, as melt constituents randomly impinging on otherwise hot surfaces are more likely to adhere thereto, eventually causing a melt overflow at the blast nozzle unit 6. However, as a result of provision of a cooling means, the blast nozzle flanks, which are preferably manufactured from nickel, can be manufactured from a cheaper material, for example stainless steel, which is, in addition, more wear-resistant. On the other hand, so much heat is removed by the coolant that the microclimate in the downstream chute is less thermally loaded, i.e. the danger of premature curing of binder while still in the chute is avoided. The heat removed with the coolant can, where appropriate, be utilised elsewhere.
A further advantage derived from provision of cooling ducts 19 lies in the fact that the blast nozzle halves can be brought closer together, as a result of which the proportion of entrained ambient media is reduced. Consequently, the quantities of gas which have to be extracted through the product and treated are also correspondingly smaller. Moreover, with the distances between the flanks reduced, there is an increase in the temperature level in the fiberisation zones, thus promoting the formation of finer and less beaded fibres.
7 ~ 'I ' ' ' ~.
Fig. 2 shows a further embodiment according to the invention, in which the blast nozzle unit 6 is designed in the form of a so-called flat-land blast nozzle.
In contrast to blast nozzle unit 6 according to the embodiment shown in Fig. 1, the upper part, signified by 20, of the blast nozzle unit 6 is provided not with a rounding but with a flat land, and features a sharp-edged corner 21 of the upper part 20.
As a result of this measure, it is possible to generate a more centrally concentrated, and better centred intake flow of the secondary air which, in terms of its entrainment behaviour, acts more intensively in the vertical direction than the aerodynamically smoother and rounder inlet as shown in the embodiment depicted in Fig. 1.
With respect to further details, features and advantages of the guide cells which may be employed in this context, and the injection there of water and binder, and of the construction of the chute and the blast nozzle unit 6, reference is made to the six co-pending German applications of the present assignee entitled "Apparatus for producing mineral wool from silicate raw materials, in particular basalt, by blast drawing" under patent agent folio No. llGH06312; "Apparatus for producing mineral wool from silicate raw materials such as basalt by blast drawing"
under patent agent folio No. llGH06322; "Process and apparatus for the continuous production of mineral wool nonwovens" under patent agent folio No. llGH06332; "Process for the melting of silicate raw materials, in particular for the production of mineral wool, and apparatus for the preheating of the raw material mixture" under patent agent folio No. llGH06342;
"Apparatus for the continuous production of mineral wool nonwovens" under patent agent folio No. llGH06362; and "Apparatus for the continuous production of mineral wool nonwovens" under patent agent folio No. llGH06372, all filed on the same day, the full contents thereof being hereby incorporated by reference.
'1 Apparatus for the production of wool, in particular rock wool, from a melt The invention relates to an apparatus for the production of wool, in particular rock wool, from a melt in accordance with the preamble of claim 1.
In the blast drawing process, primary filaments emerging from, as a rule, a row of exit orifices of a melt distributor, are fed into the drawing gap of a blast nozzle and are accelerated and thus pre-drawn in a gas flow which likewise enters the drawing gap. Downstream of the blast nozzle exit, the thus formed gas-fibre dispersion has to be decelerated, and the static pressure of the gas flow raised to approximately ambient pressure, in order to be able to deposit the fibres which have solidified on cooling to form, eventually, a nonwoven fabric. In this connection, it is known, for example, from published German patent application ~E-OS 38 07 420 that a subsonic diffuser is employed for deceleration in the form of a so-called impact diffuser with at least one sudden widening of the cross section of the flow boundary. This has the effect that the fibre and/or fibre-gas dispersion, downstream of the sudden widening of the cross section, undergoes a relatively pronounced degree of expansion, so that the mutual clearance between the filaments of the fibres is increased and the probability of their coming into contact with one another is minimised. Downstream of the sudden widening of the cross section, so-called impact eddies are formed on both sides in the backflow zones, said impact eddies forming, in technical flow terms, the boundary of the main flow. Direct wall contact of filament constituents is thus avoided in the region of the impact eddies by virtue of the fact that the flow boundary is formed by another flow and not by the solid wall.
Owing to the fibre contact which thus occurs, and the accompanying thermal loading, the walls of the blast nozzle undergo wear cO that the blast nozzle has to be replaced at regular intervals. Although the blast nozzle may, for the purpose of increasing its service life, be manufactured from pure nickel or from high-alloy, wear-resistant steel, whereby in the last-mentioned case a cooling arrangement for the side walls has had to be added to further extend service life, the disadvantage nevertheless remains that the impact diffuser arranged below the blast nozzle as a separate part is likewise subject to considerable wear, at least in the upper region, i.e. in the region of the first stage of the impact diffuser, owing to the fibre contact which occurs at the wall there, so that the impact diffuser also wears out at regular intervals and has to be completely replaced by a new impact diffuser.
The object of the present invention is to combat this problem through the characterising features of claim 1.
By designing the blast nozzle as a single-piece component with the first stage of the impact diffuser, an approach which initially appears to contradict functional requirements, the situation is created whereby the parts of the fiherisation unit which undergo the most wear and tear can be replaced as a whole.
As claimed in claim 2, for the purpose of increasing service life the first stage of the impact diffuser, designed together with the blast nozzle as a single piece, is manufactured from the same material, for example a high-alloy, wear-resistant steel.
As claimed in claim 3, the service life of the wearing parts can be further extended to good advantage by cooling the side walls of the blast nozzle and/or the impact diffuser by means of cooling ducts which are swept by a coolant.
3 ~ )~"~
In a particularly advantageous further development of the invention, the blast nozzle is designed, as claimed in claim 4, in the form of a so-called flat-land blast nozzle.
Further details, features and advantages of the invention are revealed in the following description of an embodiment by reference to the drawing in which ig. 1 shows in schematically simplified form a section through an appliance according to the invention for the fiberisation of mineral fibre melts, with a blast nozzle and the first stage of an impact diffuser, and with further stages of the impact diffuser, and ig. 2 shows in a representation essentially similar to that of Fig. 1, a modified embodiment with a so-called flat-land blast nozzle.
As is apparent from Fig. 1, melt, in the illustrative example mineral melt, is fed from a melting tank, not depicted in any further detail, to a distributor tank, signified by 1, which is manufactured from platinum, emerging in the present embodiment in the form of a plurality of adjacently arranged primary filaments from exit orifices 2 of the distributor tank 1. For reasons of clarity, the melt itself is not depicted. The exit orifices 2 arranged in a row exhibit in the embodiment a diameter of approx. 1 to 2 mm and are spaced at intervals of approx. twice the orifice diameter. These dimensions may, however, be modified upward or downward depending on the melt. The exit zone of the distributor tank in the present case is heated by hot combustion gases 3, these latter passing through a narrow gap 4 on both sides of the exit zone of the distributor tank 1 at high velocity and enveloping the divided flows of melt in the zone where formation and movement of the primary filaments takes place. The mass flow of melt per exit orifice is determined by the temperature and the geostatic pressure of the melt, the orifice 2~r,9~
diameter and the level of static partial vacuum in the exit plane of the orifices 2. This partial vacuum is generally generated by injection of a blown medium 5 through nozzle orifices, said blown medium being supplied to a blast nozzle unit, generally signified by 6, and entering through, in the present embodiment, slit-like nozzle orifices 7 in the upper region of a nozzle slot 8 of the nozzle unit. The injection of the blown medium 5 through the blow-in slits 7 takes place on both sides of the nozzle slot 8 in a pattern which is essentially wall-parallel or parallel to the centreline 9 of the blast nozzle units 6. In this process, the pre-drawn primary filament in the suction zone is excited such that it oscillates in a direction transverse to the main flow direction, is entrained by the rapid wall jets and is further accelerated and drawn. The flow velocity of the drawing gas streams, which are composed of the actual blown medium 5 as the propellant, the sucked-in hot combustion gases 3 and the ambient medium (secondary air) depicted at 10, and which can easily assume supersonic speed in accordance with the converging-diverging contour of the blast nozzle units 6, is reduced in a downstream subsonic diffuser 11. The narrower the subsonic diffuser 11, the finer, and also shorter are the fibres obtained.
The point at which the flow leaves the subsonic diffuser 11 generally marks the end of the fibre formation process. Normally the fibre-air dispersion is then further decelerated and cooled in the chute with the addition of coolants, sizing/slashing agents, binders and/or further conditioning means, and also with further false air being sucked in. The fibres are deposited in the form of a wool non-woven fabric on a perforated accumulating conveyor located below, and are separated from the drawing and entrained gases (process air) by vacuum chambers with downstream fans arranged below the accumulating conveyor.
The subsonic diffuser 11 is designed as an impact diffuser with, in the present illustrative embodiment, three stages 13, 14 and 15 within its flow boundary, with sudden inward or outward changes in cross section, 16, 17 and 18. The customary single or multiple impact diffusers, which are known per se, are characterised by the fact that the main flow at those points where there is a sudden widening of the cross section breaks down and only returns to the solid flow boundary after a certain flow length over which a backflow zone is formed. The higher the number of stages 13, 14 or 15, the better is the efficiency with which dynamic pressure energy is converted into static pressure energy.
In the case of the apparatus according to Fig. 1, the individual inward or outward changes in cross section 16, 17, 18, and the length of the individual stages 13, 14 and 15 can be dimensioned such that the melt and fibre constituents, which follow the drawing gas flows with a certain degree of slippage, only come into contact with the solid flow boundary at the end of each stage, with any wall contact occurring virtually parallel to the wall, thus resulting in the melt filaments only being exposed to insignificant deceleration and cooling phenomena with ensuing bead formation.
The length of the individual stages 13, 14 and 15 should be selected such that, in the stage exit-plane, no further backflow zones are formed, as these can lead to large-volume flows which are mostly unstable and have as their consequence a non-uniform fibre flow pattern. From this point of view, the preferred minimum length of the stages 13, 14 and 15 is approximately 5 to 6 times the difference of the roots of the respective exit and entry cross sections of each stage 13, 14 and 15.
With respect to further details, features and advantages of the impact diffuser 11, express reference is made to printed German patent application DE-OS 38 07 42Q of the present assignee, filed on the same day, the full contents thereof being hereby incorporated by reference.
6 ~ 7~
According to the invention, provision is now made for those parts which, owing to the fibre material impinging on the wall and the thermal loads associated therewith, undergo the most wear, i.e.
the blast nozzle unit 6 and the section corresponding to the first stage 13 of the impact diffuser 11, to be designed as a single-piece component which can be completely replaced if required.
As shown in the drawing, the walls of the nozzle slot 8 of the blast nozzle unit 6, and the subsonic diffuser 11 feature cooling ducts which are individually and severally signified by 19.
These result in intensive cooling of the flanks of the nozzle slot 8, and/or of the solid flow boundary of the subsonic diffuser 11. As a result of the cooling of the surfaces which are directly involved in heat exchange with the fibre dispersion, operational reliability is increased on the one hand, as melt constituents randomly impinging on otherwise hot surfaces are more likely to adhere thereto, eventually causing a melt overflow at the blast nozzle unit 6. However, as a result of provision of a cooling means, the blast nozzle flanks, which are preferably manufactured from nickel, can be manufactured from a cheaper material, for example stainless steel, which is, in addition, more wear-resistant. On the other hand, so much heat is removed by the coolant that the microclimate in the downstream chute is less thermally loaded, i.e. the danger of premature curing of binder while still in the chute is avoided. The heat removed with the coolant can, where appropriate, be utilised elsewhere.
A further advantage derived from provision of cooling ducts 19 lies in the fact that the blast nozzle halves can be brought closer together, as a result of which the proportion of entrained ambient media is reduced. Consequently, the quantities of gas which have to be extracted through the product and treated are also correspondingly smaller. Moreover, with the distances between the flanks reduced, there is an increase in the temperature level in the fiberisation zones, thus promoting the formation of finer and less beaded fibres.
7 ~ 'I ' ' ' ~.
Fig. 2 shows a further embodiment according to the invention, in which the blast nozzle unit 6 is designed in the form of a so-called flat-land blast nozzle.
In contrast to blast nozzle unit 6 according to the embodiment shown in Fig. 1, the upper part, signified by 20, of the blast nozzle unit 6 is provided not with a rounding but with a flat land, and features a sharp-edged corner 21 of the upper part 20.
As a result of this measure, it is possible to generate a more centrally concentrated, and better centred intake flow of the secondary air which, in terms of its entrainment behaviour, acts more intensively in the vertical direction than the aerodynamically smoother and rounder inlet as shown in the embodiment depicted in Fig. 1.
With respect to further details, features and advantages of the guide cells which may be employed in this context, and the injection there of water and binder, and of the construction of the chute and the blast nozzle unit 6, reference is made to the six co-pending German applications of the present assignee entitled "Apparatus for producing mineral wool from silicate raw materials, in particular basalt, by blast drawing" under patent agent folio No. llGH06312; "Apparatus for producing mineral wool from silicate raw materials such as basalt by blast drawing"
under patent agent folio No. llGH06322; "Process and apparatus for the continuous production of mineral wool nonwovens" under patent agent folio No. llGH06332; "Process for the melting of silicate raw materials, in particular for the production of mineral wool, and apparatus for the preheating of the raw material mixture" under patent agent folio No. llGH06342;
"Apparatus for the continuous production of mineral wool nonwovens" under patent agent folio No. llGH06362; and "Apparatus for the continuous production of mineral wool nonwovens" under patent agent folio No. llGH06372, all filed on the same day, the full contents thereof being hereby incorporated by reference.
Claims (4)
1 Gr?nzweig + Hartmann AG
6700 Ludwigshafen, DE
Patent claims 1. An apparatus for the production of wool, in particular rock wool, from a melt by blast drawing, with a blast nozzle (6), the drawing gap (8) of which is capable of receiving at least one primary filament of the melt which is fiberised there under the effect of blown flows injected laterally in the direction of said primary filament, and with a subsonic diffuser (11) appended to the outlet of the blast nozzle (6) for decelerating the gas-fibre dispersion and solidification of the molten fibres as solidified wool, said subsonic diffuser (11) being designed as an impact diffuser with at least one sudden widening of the cross section (return at 16) of the flow boundary, w h e r e i n at least the first stage (13) of the impact diffuser (11) is designed as a single piece incorporating the blast nozzle (6).
6700 Ludwigshafen, DE
Patent claims 1. An apparatus for the production of wool, in particular rock wool, from a melt by blast drawing, with a blast nozzle (6), the drawing gap (8) of which is capable of receiving at least one primary filament of the melt which is fiberised there under the effect of blown flows injected laterally in the direction of said primary filament, and with a subsonic diffuser (11) appended to the outlet of the blast nozzle (6) for decelerating the gas-fibre dispersion and solidification of the molten fibres as solidified wool, said subsonic diffuser (11) being designed as an impact diffuser with at least one sudden widening of the cross section (return at 16) of the flow boundary, w h e r e i n at least the first stage (13) of the impact diffuser (11) is designed as a single piece incorporating the blast nozzle (6).
2. An apparatus as claimed in claim 1, wherein the blast nozzle (6), which is designed as a single piece together with the first stage (13) of the impact diffuser (11), is manufactured from a high-alloy, wear-resistant steel.
3. An apparatus as claimed in claim 1 or 2, wherein the side walls of the blast nozzle (6) and/or at least the first stage (13) of the impact diffuser (11) feature cooling ducts for the through-passage of a coolant.
4. An apparatus as claimed in one of the preceding claims, wherein the blast nozzle (6) is designed in the form of a flat-land blast nozzle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19914141626 DE4141626C2 (en) | 1991-12-17 | 1991-12-17 | Device for producing wool, in particular rock wool, from a melt |
| DEP4141626.0 | 1991-12-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2077241A1 true CA2077241A1 (en) | 1993-06-18 |
Family
ID=6447268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2077241 Abandoned CA2077241A1 (en) | 1991-12-17 | 1992-08-31 | Apparatus for the production of wool, in particular rock wool, from a melt |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2077241A1 (en) |
| DE (1) | DE4141626C2 (en) |
| TR (1) | TR26527A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7827822B2 (en) * | 2007-07-25 | 2010-11-09 | Schott Corporation | Method and apparatus for spray-forming melts of glass and glass-ceramic compositions |
| DE102018129940A1 (en) * | 2018-11-27 | 2020-05-28 | Saint-Gobain Isover G+H Aktiengesellschaft | Blowing nozzle for a device for producing mineral wool and device with such a blowing nozzle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3807420A1 (en) * | 1988-03-07 | 1989-09-21 | Gruenzweig & Hartmann | DEVICE FOR PRODUCING FIBERS, IN PARTICULAR MINERAL FIBERS, FROM A MELT |
-
1991
- 1991-12-17 DE DE19914141626 patent/DE4141626C2/en not_active Expired - Lifetime
-
1992
- 1992-02-14 TR TR16192A patent/TR26527A/en unknown
- 1992-08-31 CA CA 2077241 patent/CA2077241A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE4141626C2 (en) | 2001-07-26 |
| TR26527A (en) | 1995-03-15 |
| DE4141626A1 (en) | 1993-06-24 |
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