Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
188 words
Apparatus for producing fibres from a thermoplastics material and comprising a centrifuge (10) revolving about a substantially vertical axis (22), means for driving the said centrifuge with a rotary motion, means of conveying a stream (24) of material molten to the drawable condition into the centrifuge and carrying it onto the inner surface of the peripheral wall of the said centrifuge, a large number of orifices (40) in the peripheral wall through which the molten material passes to form filaments (41), end means of drawing the said filaments (41) into fibres, said means comprising an internal combustion burner delivering an annular gaseous jet adjacent to the outer part of the said peripheral wall which is directed downwardly, the said annular gaseous jet being at an elevated temperature contributing to maintaining the filaments of material under drawable conditions for a period of time sufficient for drawing, characterised in that the diameter of the centrifuge is between 550 and 1500 mm and in that the centrifuge is driven with a rotary movement under conditions in which its periphery is subject to a centrifugal acceleration comprised between 4000 and 20,000 m/s2.
Claim 2
Dependent Claim
188 words
Apparatus for producing fibres from a thermoplastics material and comprising a centrifuge (10) revolving about a substantially vertical axis (22), means for driving the said centrifuge with a rotary motion, means of conveying a stream (24) of material molten to the drawable condition into the centrifuge and carrying it onto the inner surface of the peripheral wall of the said centrifuge, a large number of orifices (40) in the peripheral wall through which the molten material passes to form filaments (41), end means of drawing the said filaments (41) into fibres, said means comprising an internal combustion burner delivering an annular gaseous jet adjacent to the outer part of the said peripheral wall which is directed downwardly, the said annular gaseous jet being at an elevated temperature contributing to maintaining the filaments of material under drawable conditions for a period of time sufficient for drawing, characterised in that the diameter of the centrifuge is between 550 and 1500 mm and in that the centrifuge is driven with a rotary movement under conditions in which its periphery is subject to a centrifugal acceleration comprised between 4000 and 20,000 m/s2.
Claim 3
Dependent Claim
18 words
Apparatus according to Claim 1, in which the centrifuge (10) has a diameter between 600 and 1000 mm.
Claim 4
Dependent Claim
32 words
Apparatus according to Claim 2, in which the centrifuge (10) rotates under conditions in which the periphery of the centrifuge is subject to a centrifugal acceleration of between 8000 and 14000 m/s2
Claim 5
Dependent Claim
37 words
Apparatus according to one of the preceding Claims, characterised in that the internal combustion burner generates a gas jet of which the pressure at the outlet from the burner is comprised between 100 and 900 mm WG.
Claim 6
Dependent Claim
22 words
Apparatus according to Claim 4, in which the pressure of the burner is within the range from 200 to 600 mm WG.
Claim 7
Dependent Claim
42 words
Apparatus according to one of the preceding Claims, in the operation of which the heat consumption of the burner for purposes of producing fibre having a micronaire is 3 under 5 g is less than 1500 kcal per kg of fibres produced.