GB2147628A - Raising yarn - Google Patents

Abstract

A method of yarn raising comprises taking a yarn 20 on a first pass through a raising zone 16, inverting the yarn by means of an inverter guide 24 and taking it through the raising zone 16a second time. By this method the yarn is raised substantially entirely about its circumference. The guide 24 comprises a tube 26 having a low pitch helical slot 28 in its wall. The pitch of the helix turns the slot through 180 DEG in the length of the tube 26. The guide 24 is supported by a bracket 30. The tube includes a plate to facilitate threading up. The yarn is finally wound about a creel 34. <IMAGE>

Description

SPECIFICATION Yarn Raising This invention relates to improvements in yarn raising.

Yarn raising is employed with staple fibre yarns to give a fluffy or mohair-type effect to the yarn. The yarn is passed from a package one or more times between a pair of contra rotating rollers one or both of which carry card clothing thereby raising up fibres from the yarn surface. Yarns raised this way tend to suffer from the disadvantage that one side only of the yarn is raised and in a knitted or woven fabric this can lead to patchy results. In orderto overcome this it has been proposed to raise specially spun loop yarn whereby in the raising step loops are destroyed to produce the necessary fluffiness. This leads to a very fluffy yarn but is relatively expensive since the spinning of a loop yarn is an expensive operation.

The invention seeks to provide an improved method of yarn raising which is simple and economical.

In accordance with the present invention there is provided a method of yarn raising which comprises taking a yarn on a first pass through a raising zone, inverting the yarn and taking it through the raising zone a second time.

By the method of the invention the yarn is raised substantially entirely about its circumference and produces very good results when used in either knitted or woven fabrics, yet is substantially cheaper to produce than raised loop yarns.

One form of apparatus which may be used to inverttheyarn between its first and second passage through the raising zone comprises a guide flume in the form of a tube within which the yarn runs having a longitudinal slot in its wall, the slot being of low pitch helical configuration. The yarn after its first pass through the raising zone is passed through the guide tube with the raised fibres keying into and being guided by the slot. If sufficient length of guide tube is provided for the slot to turn through 1800 thus inverting the yarn immediately prior to its passing into the raising zone for its second pass.

The method and apparatus of the invention may be applied to texile yarns of all type but are more particularly applicable to staple yarns, and in particular staple yarns of animal fibres such as sheeps wool.

The invention will be described further, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a diagrammatic general view of a yarn raising apparatus; Figure 2 is a partial view on enlarged scale of the raising zone; Figure 3 is a side view corresponding to figure 2; Figure 4 is a sectional view through a yarn raised conventionally; Figures 5 and 6 illustrate how a conventionally raised yarn lies in a fabric; Figure 7 is an inverting guide in accordance with the present invention; Figure 8 is a plan view corresponding to figure 7; and Figure 8 is a detail of the end of the guide of figure 7.

Referring to the drawings, raising apparatus generally designated 10 comprises a pair of rollers 12,14 together defining a raising zone 16. The rollers are covered in card clothing 18 so that a yarn 20 passing through the zone 16 has fibres 22 raised from its surface.

As illustrated in figure 1 the yarn receives two passes about the roller 12 and, in accordance with the invention, between its first and second pass the yarn is passed through an inverter guide 24 which comprises a tube 26 having a low pitch helical slot 28 in its wall. The pitch of the helix is such that it turns the slot through 1800 in the length of the tube 26. A mounting bracket 30 is provided for attaching the inverting guide adjacent the raising zone 16, and a threading up plate 32 may also be provided to assist threading up.

The yarn 20 after its first pass through the zone 16 is threaded into the guide 24 with its raised fibres 22 emerging through the slot 28 and being guided thereby. As the yarn 20 passes through the guide 24 the slot 28 and hence the fibres 22 and therefore the yarn is inverted through 1800. It is then passed through the zone 16 a second time causing the reverse surface to be raised on this pass. The raised yarns are taken up on a suitable creel or beam 34.

Yarns raised in accordance with the invention are considerably more economical than raised loop yarns and do not suffer from the disadvantages associated with raised plane yarns but can be made up into knitted or woven fabrics having good fluffiness characteristics with absence of bare patches.

1. A method of yarn raising which comprises taking a yarn on the first pass through a raising zone, inverting the yarn and taking it through the raising zone a second time.

2. A method of raising a yarn substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.

3. An apparatus for carrying out the method of claim 1 which comprises a guide flume in the form of a tube within which a yarn runs having a longitudinal slot in its wall, the being of low pitch helical configuration.

4. An apparatus as claimed in claim 3 in which the guide tube is of sufficient length for the slot to turn through 1800.

5. An apparatus substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Yarn Raising This invention relates to improvements in yarn raising. Yarn raising is employed with staple fibre yarns to give a fluffy or mohair-type effect to the yarn. The yarn is passed from a package one or more times between a pair of contra rotating rollers one or both of which carry card clothing thereby raising up fibres from the yarn surface. Yarns raised this way tend to suffer from the disadvantage that one side only of the yarn is raised and in a knitted or woven fabric this can lead to patchy results. In orderto overcome this it has been proposed to raise specially spun loop yarn whereby in the raising step loops are destroyed to produce the necessary fluffiness. This leads to a very fluffy yarn but is relatively expensive since the spinning of a loop yarn is an expensive operation. The invention seeks to provide an improved method of yarn raising which is simple and economical. In accordance with the present invention there is provided a method of yarn raising which comprises taking a yarn on a first pass through a raising zone, inverting the yarn and taking it through the raising zone a second time. By the method of the invention the yarn is raised substantially entirely about its circumference and produces very good results when used in either knitted or woven fabrics, yet is substantially cheaper to produce than raised loop yarns. One form of apparatus which may be used to inverttheyarn between its first and second passage through the raising zone comprises a guide flume in the form of a tube within which the yarn runs having a longitudinal slot in its wall, the slot being of low pitch helical configuration. The yarn after its first pass through the raising zone is passed through the guide tube with the raised fibres keying into and being guided by the slot. If sufficient length of guide tube is provided for the slot to turn through 1800 thus inverting the yarn immediately prior to its passing into the raising zone for its second pass. The method and apparatus of the invention may be applied to texile yarns of all type but are more particularly applicable to staple yarns, and in particular staple yarns of animal fibres such as sheeps wool. The invention will be described further, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a diagrammatic general view of a yarn raising apparatus; Figure 2 is a partial view on enlarged scale of the raising zone; Figure 3 is a side view corresponding to figure 2; Figure 4 is a sectional view through a yarn raised conventionally; Figures 5 and 6 illustrate how a conventionally raised yarn lies in a fabric; Figure 7 is an inverting guide in accordance with the present invention; Figure 8 is a plan view corresponding to figure 7; and Figure 8 is a detail of the end of the guide of figure 7. Referring to the drawings, raising apparatus generally designated 10 comprises a pair of rollers 12,14 together defining a raising zone 16. The rollers are covered in card clothing 18 so that a yarn 20 passing through the zone 16 has fibres 22 raised from its surface. As illustrated in figure 1 the yarn receives two passes about the roller 12 and, in accordance with the invention, between its first and second pass the yarn is passed through an inverter guide 24 which comprises a tube 26 having a low pitch helical slot 28 in its wall. The pitch of the helix is such that it turns the slot through 1800 in the length of the tube 26. A mounting bracket 30 is provided for attaching the inverting guide adjacent the raising zone 16, and a threading up plate 32 may also be provided to assist threading up. The yarn 20 after its first pass through the zone 16 is threaded into the guide 24 with its raised fibres 22 emerging through the slot 28 and being guided thereby. As the yarn 20 passes through the guide 24 the slot 28 and hence the fibres 22 and therefore the yarn is inverted through 1800. It is then passed through the zone 16 a second time causing the reverse surface to be raised on this pass. The raised yarns are taken up on a suitable creel or beam 34. Yarns raised in accordance with the invention are considerably more economical than raised loop yarns and do not suffer from the disadvantages associated with raised plane yarns but can be made up into knitted or woven fabrics having good fluffiness characteristics with absence of bare patches. CLAIMS

1. A method of yarn raising which comprises taking a yarn on the first pass through a raising zone, inverting the yarn and taking it through the raising zone a second time.

2. A method of raising a yarn substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.

3. An apparatus for carrying out the method of claim 1 which comprises a guide flume in the form of a tube within which a yarn runs having a longitudinal slot in its wall, the being of low pitch helical configuration.

4. An apparatus as claimed in claim 3 in which the guide tube is of sufficient length for the slot to turn through 1800.

5. An apparatus substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.