GB1305757A - - Google Patents

Abstract

1305757 Mixed filament and fibre yarn BEMBERG SpA 12 Aug 1970 [30 Aug 1969] 38807/70 Headings D1F and D1W A process for the manufacture of a yarn consisting of a bundle of filaments and fibres, in which the fibres are blown on to the filament bundle by a gas or air stream and are interlaced with the filament bundle by this gas or air stream is characterised in that a fibre metering device delivers the desired amount of fibres into the gas or air stream. The gas or air stream may be guided through the fibre metering device or a part of the stream is guided through the metering device and before or in the interlacing device is combined with the gas or air stream which passed outside the metering device. The gas or air stream passing through the metering device may be intermittent or fluctuating and intermittently obtains a pressure higher than that of the stream passing outside the metering device. In an alternative embodiment, the supply of fibres to the gas or air stream may be intermittent. The frequency of the intermittent supply of fibres is preferably equal to the frequency of the intermittent supply of gas or air in the stream. The fibres are preferably formed by the action of a knife which moves within the metering device and acts upon a sliver or filament bundle fed to the metering device. In a preferred form of apparatus for carrying out the process an interlacing device 2 contains a chamber with a supply and discharge opening 3, 4 for the filament bundle 1, and an interlacing air inlet 5 to which a second air supply channel 8 is connected, and is characterised in that a fibre metering device opens into a first air supply channel 10 which is connected, between the metering device and the interlacing device, to the second air supply channel 8. The metering device is preferably equipped with a cutter 12 which acts on a sliver or filament bundle 11 fed to the device by feed rollers 13. The intermittent supply of fibres and air is effected by means of a rotatable air valve fitted in the first air supply channel 10. The cutting device 12, the feed rollers 13 and the air valve are operated by one drive and by suitable selection of transmission gears, the ratios of the drive of the cutter, the feed rollers and the air valve are adjustable. The yarn produced may have an even or regularly uneven appearance. The same or different materials may be employed for the filaments and fibres. The process is advantageously employed with a draw-twisting process, the interlacing being effected between the drawing and twisting processes.