Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
248 words
In an apparatus for producing fine mineral fibers, in particular glass or diabase fibres by the nozzle blast process, comprising a melt crucible having a base with at least one row of outlet openings from which primary filaments issue, a converging/diverging draw nozzle receptive of a blowing medium for sucking primary filaments into the draw nozzle and a subsonic diffuser connected to the diverging portion of the draw nozzle for separating primary filaments into fibres, the improvement wherein: (a) the diameter of each crucible outlet opening is from 0.2 mm to 1.5 mm, (b) means disposed in the region of the crucible outlet opening to effect the grasping of the primary filaments by the blowing medium with a markedly turbulent flow at a high flow rate, with the transverse component of the flow decreasing in favour of the longitudinal component as the axial distance from the outlet openings increases, (c) the draw nozzle has an inlet portion which ends outwards with a sharp edge and widens in the flow direction, (d) the draw nozzle is arranged with its inlet portion at a small distance below the outlet openings, (e) the length of the widening inlet portion is from 2.5 to 9 mm, (f) the flow rate of the blowing medium at the end of the inlet portion is from 400 m/sec to 600 m/sec at a pressure of from 0.1 bar to 0.4 bar, this pressure remaining constant over a subsequent portion of from 30 to 100 mm.
Claim 2
Dependent Claim
248 words
In an apparatus for producing fine mineral fibers, in particular glass or diabase fibres by the nozzle blast process, comprising a melt crucible having a base with at least one row of outlet openings from which primary filaments issue, a converging/diverging draw nozzle receptive of a blowing medium for sucking primary filaments into the draw nozzle and a subsonic diffuser connected to the diverging portion of the draw nozzle for separating primary filaments into fibres, the improvement wherein: (a) the diameter of each crucible outlet opening is from 0.2 mm to 1.5 mm, (b) means disposed in the region of the crucible outlet opening to effect the grasping of the primary filaments by the blowing medium with a markedly turbulent flow at a high flow rate, with the transverse component of the flow decreasing in favour of the longitudinal component as the axial distance from the outlet openings increases, (c) the draw nozzle has an inlet portion which ends outwards with a sharp edge and widens in the flow direction, (d) the draw nozzle is arranged with its inlet portion at a small distance below the outlet openings, (e) the length of the widening inlet portion is from 2.5 to 9 mm, (f) the flow rate of the blowing medium at the end of the inlet portion is from 400 m/sec to 600 m/sec at a pressure of from 0.1 bar to 0.4 bar, this pressure remaining constant over a subsequent portion of from 30 to 100 mm.
Claim 3
Dependent Claim
28 words
An apparatus according to claim 1, wherein the nozzle has a nozzle axis and the melt crucible with the outlet openings is laterally offset from the nozzle axis.
Claim 4
Dependent Claim
31 words
An apparatus according to claim 1 or claim 2, wherein the distance between the outlet openings and the upper edge of the inlet portion is from 0.3 mm to 4 mm.
Claim 5
Dependent Claim
33 words
An apparatus according to claim 1, wherein the grasping means comprises guide members which promote the transverse flow of the blowing medium and are disposed in the intake cross-section around the outlet openings.
Claim 6
Dependent Claim
27 words
An apparatus according to claim 1, further comprising a hot air duct arranged on one side between the crucible and the inlet portion of the draw nozzle.
Claim 7
Dependent Claim
47 words
An apparatus according to claim 2, wherein the crucible has two rows of outlet openings, these rows laterally offset from the nozzle axis by the same amount and the outlet openings are offset from one another relative to the outlet openings in the direction of the row.
Claim 8
Dependent Claim
35 words
The apparatus according to claim 1, wherein each crucible outlet opening has a diameter of from 0.3 mm to 0.8 mm and the length of the widening inlet portion is from 2.5 to 4 mm.
Claim 9
Dependent Claim
15 words
The apparatus according to claim 3, wherein the distance is from 0.5 to 2 mm.