Method for the manufacture of twistless or substantially twistless yarn
AssigneeHollandse Signaalapparaten B.V.
InventorsJan Nijhuis, Thomas H. M. Terwee
Life of this patent
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Abstract
In a method for the manufacture of twistless yarn a sliver of staple fibre material is drafted in two drafting zones, which are separated by a neutral zone. The drafting in the first zone occurs in a dry condition and in the second zone in a wet condition. The drafting liquid, which can contain a bonding agent, is supplied to the sliver through a false twister inserted in the neutral zone. This drafting process provides an increased uniformity of twistless yarn in a range of counts of 10-300 tex at a production rate of 300 to 600 m/min.
Claims6
Method for the manufacture of twistless or substantially twistless yarn from a sliver of staple fibre material, including the sequential steps of:
- dry-drafting the sliver in a first drafting zone,
- false twisting and wetting the drafted sliver by means of a first false twister to which a liquid is supplied, whereby the liquid content of the sliver is brought to at least 80% by weight,
- drafting the wetted sliver in a second drafting zone to form a thinner fibre strand,
- false twisting the fibre strand by means of a second false twister, and
- bonding the fibres of the fibre strand.
Method for the manufacture of twistless or substantially twistless yarn from a sliver of staple fibre material, including the sequential steps of:
- drafting the sliver in a first drafting zone in a dry condition,
- false twisting and wetting the drafted sliver by means of a first false twister to which a liquid is supplied sufficient that free liquid remains adhering to the surface of the fibres,
- wet drafting the wetted sliver in a second drafting zone to form a thinner fibre strand,
- false twisting the fibre strand by means of a second false twister, and
- bonding the fibres of the fibre strand.
Dependencies are inferred from the claim text.