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AssigneeOerlikon Textile GmbH & Co. KG
InventorsMathias Stündl, Friedrich Lennemann, Kirsten Prehn
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A melt-spinning process and a melt-spinning apparatus produce a crimped yarn. By means of a spinning device, a filament bundle is generated from a thermoplastic polymer, is drawn after cooling and is compressed into a yarn plug in a stuffing chamber. The yarn plug is opened up into a crimped yarn and wound into a bobbin. In order to obtain as high a crimp resistance of the yarn as possible, amorphous fractions in the molecular structure of the yarn material are avoided after drawing. This is achieved by means of relaxation treatment after drawing and before compression, a minimum yarn pull force of >0.05 cN/dtex with a relaxation temperature in the range of 120° C. to 245° C. being maintained.
A melt-spinning process for producing a crimped yarn, in which at least one filament bundle is generated from a thermoplastic polymer by the spinning of a plurality of filaments, in which the filament bundle is drawn after cooling and is compressed into a yarn plug in a stuffing chamber, and in which the yarn plug is opened up into a crimped yarn and wound into a bobbin, wherein, after drawing and before compression, the filament bundle undergoes relaxation treatment at a relaxation temperature in the range of 120° C. to 245° C. and with a minimum yarn pull force of >0.05 cN/dtex.
A melt-spinning apparatus for producing a crimped yarn, with a melt-spinning device, with a cooling device, with a drawing device, with a crimping device and with a winding device, the drawing device having a take-up godet pair with at least one heated godet and a drawing godet pair with two heated godets, wherein charactcrizcd in that the heated godets, of the drawing godet pair have in each case a stepped or conical godet casing, by means of which relaxation treatment can be carried out on a filament bundle guided in a plurality of loopings, with a minimum yarn tension of >0.05 cN/dtex and a relaxation temperature in the range of 120° C. to 245° C.
Dependencies are inferred from the claim text.