Combined and Doubling System of Yarn Manufacturing

 Combined Systems :

Combined systems were first established in order to unite the benefits of the ring and hollowspindle systems in a single machine, as it was thought that a yarn with twist had a more stable and reliable structure than one with a fasciated structure. Later, it was recognised that two hollow spindles could also be assembled in series and that this would offer a variety of yarns and a different range of benefits. This is illustrated in Figure 1, which depicts two hollow spindles, arranged one above the other, which wrap the staple strand with two binders applied in opposing directions. This technique is used to produce special-effect yarns that have a more stable structure, as the effect fibres are trapped by two binders instead of one. Figure 2 shows the original combined system in which the hollow spindle and ring spindle are combined in a single machine. In this case, the wrapped yarn is provided with some true twist by the ring spindle placed immediately below the hollow spindle. It was thought that the speed of the hollow spindle assembly would be enhanced by the true twist inserted by the ring spindle, and that it would therefore be able to create yarns that are less expensive than true ring-spun yarns while still retaining some of their characteristics.

Combined Systems : Combined systems were first established in order to unite the benefits of the ring and hollowspindle systems in a single machine, as it was thought that a yarn with twist had a more stable and reliable structure than one with a fasciated structure. Later, it was recognised that two hollow spindles could also be assembled in series and that this would offer a variety of yarns and a different range of benefits. This is illustrated in Figure 1, which depicts two hollow spindles, arranged one above the other, which wrap the staple strand with two binders applied in opposing directions. This technique is used to produce special-effect yarns that have a more stable structure, as the effect fibres are trapped by two binders instead of one. Figure 2 shows the original combined system in which the hollow spindle and ring spindle are combined in a single machine. In this case, the wrapped yarn is provided with some true twist by the ring spindle placed immediately below the hollow spindle. It was thought that the speed of the hollow spindle assembly would be enhanced by the true twist inserted by the ring spindle, and that it would therefore be able to create yarns that are less expensive than true ring-spun yarns while still retaining some of their characteristics. Fig 1 : Schematic layout of two-spindle wrap system. Fig 2 : Combination of Ring and Hollow spindle The Doubling System : The conventional doubling system is based on ring spinning. The arrangement provides two or more yarns that can be fed independently at controlled speeds. These may include uniform, fluctuating or intermittent feeds as required, so permitting a simple means of producing spiral or marl-type yarns, although obviously requiring the feed material to be in yarn form. This method allows spinners who do not specialise in fancy yarn production to manufacture some of the simpler fancy yarn structures. The doubling frame can produce some interesting effects, particularly when it is used to combine two existing fancy yarns to produce another. It is also possible to manufacture spiral effects using an ordinary doubling system. This can be done by combining two yarns of very different counts and opposite twist. If the doubling twist is in the same direction as that of the thicker single-yarn twist, the thicker yarn contracts while the thinner yarn expands, thus causing the thinner yarn to spiral around the thicker one. If the doubling twist is in the opposite direction to that of the thicker single-yarn twist, the thicker yarn expands while the thinner yarn contracts, causing the thicker yarn to spiral around thethinner one. Although their basic structure is identical, these yarns are aesthetically very different and will be used in different ways.
Fig 1 : Schematic layout of two-spindle wrap system.

Combined Systems : Combined systems were first established in order to unite the benefits of the ring and hollowspindle systems in a single machine, as it was thought that a yarn with twist had a more stable and reliable structure than one with a fasciated structure. Later, it was recognised that two hollow spindles could also be assembled in series and that this would offer a variety of yarns and a different range of benefits. This is illustrated in Figure 1, which depicts two hollow spindles, arranged one above the other, which wrap the staple strand with two binders applied in opposing directions. This technique is used to produce special-effect yarns that have a more stable structure, as the effect fibres are trapped by two binders instead of one. Figure 2 shows the original combined system in which the hollow spindle and ring spindle are combined in a single machine. In this case, the wrapped yarn is provided with some true twist by the ring spindle placed immediately below the hollow spindle. It was thought that the speed of the hollow spindle assembly would be enhanced by the true twist inserted by the ring spindle, and that it would therefore be able to create yarns that are less expensive than true ring-spun yarns while still retaining some of their characteristics. Fig 1 : Schematic layout of two-spindle wrap system. Fig 2 : Combination of Ring and Hollow spindle The Doubling System : The conventional doubling system is based on ring spinning. The arrangement provides two or more yarns that can be fed independently at controlled speeds. These may include uniform, fluctuating or intermittent feeds as required, so permitting a simple means of producing spiral or marl-type yarns, although obviously requiring the feed material to be in yarn form. This method allows spinners who do not specialise in fancy yarn production to manufacture some of the simpler fancy yarn structures. The doubling frame can produce some interesting effects, particularly when it is used to combine two existing fancy yarns to produce another. It is also possible to manufacture spiral effects using an ordinary doubling system. This can be done by combining two yarns of very different counts and opposite twist. If the doubling twist is in the same direction as that of the thicker single-yarn twist, the thicker yarn contracts while the thinner yarn expands, thus causing the thinner yarn to spiral around the thicker one. If the doubling twist is in the opposite direction to that of the thicker single-yarn twist, the thicker yarn expands while the thinner yarn contracts, causing the thicker yarn to spiral around thethinner one. Although their basic structure is identical, these yarns are aesthetically very different and will be used in different ways.
Fig 2 : Combination of Ring and Hollow spindle


The Doubling System :

The conventional doubling system is based on ring spinning. The arrangement provides two or more yarns that can be fed independently at controlled speeds. These may include uniform, fluctuating or intermittent feeds as required, so permitting a simple means of producing spiral or marl-type yarns, although obviously requiring the feed material to be in yarn form. This method allows spinners who do not specialise in fancy yarn production to manufacture some of the simpler fancy yarn structures. The doubling frame can produce some interesting effects, particularly when it is used to combine two existing fancy yarns to produce another. It is also possible to manufacture spiral effects using an ordinary doubling system. This can be done by combining two yarns of very different counts and opposite twist. If the doubling twist is in the same direction as that of the thicker single-yarn twist, the thicker yarn contracts while the thinner yarn expands, thus causing the thinner yarn to spiral around the thicker one. If the doubling twist is in the opposite direction to that of the thicker single-yarn twist, the thicker yarn expands while the thinner yarn contracts, causing the thicker yarn to spiral around thethinner one. Although their basic structure is identical, these yarns are aesthetically very different and will be used in different ways.

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