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Slub yarn

The yarn is sometimes thin and sometimes thick, and one section is called a bamboo section.

Slub was originally a common defect in textile production. Some problems such as stretch and uneven thickness are affected, causing the yarn to have uneven fineness locally, forming bulges like slubs, causing slub defects, and affecting the quality of the fabric.

But when this is like bamboo When the knot-like protrusions are evenly distributed on the surface of the fabric, they can form a special texture on the surface of the fabric, produce a unique fabric style, and meet people’s requirements for diverse fabric styles. Therefore, during the spinning process, the yarn density is thought to change regularly or irregularly in its length direction, and slub yarn is obtained, and this yarn is used in the production of fabrics to form slub yarn fabrics.

Slub yarn features

Has the appearance of uneven distribution of thickness , is the most diverse type of fancy yarn, including thick and detailed slub yarn, knotted slub yarn, short fiber slub yarn, filament slub yarn, etc. Slub yarn can be used for both light summer fabrics and heavy winter fabrics. It can be used for clothing fabrics and decorative fabrics. It has outstanding patterns, unique style and strong three-dimensional effect.

Principles and methods of slub yarn formation

Principle:

Additional device is added to the ordinary spinning machine to change the speed or pause of the front roller, thus changing the normal draft ratio. Normally, a slub suddenly appears on the yarn, like a slub, so it is called slub yarn.

Method:

Adopt electromagnetic clutch to control the front grille�Stop method

When spinning base yarn: the clutch is in a suction state to maintain the normal operation of the front roller.

Thick spinning section: the clutch loses power, the moving plate and the static plate are separated,

Stop the front roller + the middle and rear rollers are still running ➡Pile the delivered fibers between the middle roller and the front roller Between Laura.

When the clutch is powered on again, the front roller starts to run again, removing the accumulated The fibers are taken away and a slub is formed on the base yarn.

The front roller pauses for a long time ➡ There are more fibers accumulated ➡ The bamboo joints are thick

This method is suitable for making thicker bamboo joints.

It is also possible to overfeed the middle and rear rollers suddenly, which also changes the draft ratio to produce bamboo. Festival.

Stepper motor driven front roller speed change method, servo motor driven middle and rear roller overfeeding method, etc.

When using the variable speed of the front roller to produce slub yarn, it has high sensitivity, is suitable for producing denser slubs, and has better control over the length and thickness of the slubs.

Front roller speed change ➡ will affect output

The front roller is faster Time slowness + spindle speed is constant ➡ also affects the twist

Using middle and rear roller overfeeding production When using slub yarn, the production of short and dense slubs is not as sensitive as the front roller speed change, and the manufacturing cost is relatively high.

Notes

﹡When producing slub yarn, the centrifugal force at the slub is relatively large, which causes the balloon to become larger and smaller during production, so Pay attention to control when choosing a traveler. At the same time, due to the increased thickness of the bamboo joints, it is difficult to pass through the wire hoop, so a large wire hoop should be used.

﹡such as When using the front roller to stop or change speed to produce slub yarn, the twist should be controlled on the low side.

﹡For production-intensive bamboo sections, since the speed of the front roller is constantly changing, the speed should be appropriately slowed down, otherwise the breakage rate of the whole machine will increase.

﹡When stopping for manual doffing, it is best to stop at the base yarn part to avoid thick spots, otherwise due to thick spots Less twist at the joints increases breakage during driving.

Slub yarn application

Currently commonly used yarns are 12~84tex (12~83 tex). The raw materials include pure cotton and chemical fiber blended yarn, mainly short fiber yarn, as well as medium-length and wool-type fibers.

The length of the bamboo section should generally not be less than the length of the fiber. Therefore, the length of bamboo spun with cotton fiber is shorter, while the length of bamboo spun with wool type fiber is longer.

bamboo The thickness depends on the variety.

Because the thickness of the slub is too different from the base yarn, and the twist is very small, this section of yarn is not only prone to hairiness, but also has low strength. Knitted fabrics or woven fabrics made from this yarn have a rough surface and unique style. This kind of yarn is also used to make corrugated yarn on a fancy twisting machine. Because the corrugation at the slub is extremely large and looks like corn, it is also called popcorn yarn.

Main parameters of slub yarn Relationship with canvas style

Slub yarn parameters include base yarn density, slub thickness, slub length and slub spacing. Due to the special structure of slub yarn, the cloth style is closely related to the above 4 parameters;

its various combinations determine its appearance There are mainly four methods for creating special styles on cloth.

1. Since the slub part of slub yarn is thicker, the slub part is added during spinning The twist is also less, and the fibers in the bamboo segments are looser, which makes the thick and thin segments absorb dye inconsistently when dyeing slub yarn, and the style of raindrops or raindrops will be formed depending on the length of the bamboo segments.

2. The styles are different due to different raw materials: such as those spun from ordinary cotton and polyester raw materials The slub knots of the slub yarn fabric woven from a single yarn are more obvious;

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