Big belly yarn refers to the thick and thin yarn on one yarn in the finished woolen yarn. It is one of the appearance defects of the finished woolen yarn. The cross section is more than 3 times thicker than normal yarn, the length is 2-10cm, and it is in the shape of a jujube core.
What is the difference between pot belly yarn and slub yarn?
The basic difference between pot belly yarn and slub yarn is the thickness difference between it and the base yarn. The slub yarn of slub yarn is generally 5 times thicker than the base yarn. Within 2 times, most bamboo joints are controlled within 2 times. Therefore, in the whole yarn, the slubs disappear and appear less obvious. When used, a yarn with the same density as the base yarn is often used after plying and twisting; while the big belly yarn is between the big belly and the base yarn. The ratio is more than 5 times, sometimes even more than 10 times, so the potbelly is very obvious. Another difference is: slub yarn requires the thick section to be very short and the base yarn to be very long, generally no more than two slubs per meter; while big belly yarn sometimes has a larger belly than a slender one. The belly has less twist and is prone to hairiness, so it is often wrapped with a thinner filament or other short fiber yarn when used. Sometimes it is wrapped with left and right twists, that is, one twist is left and the other is twisted right; Sometimes it is even wrapped with a layer of outer casing on the syringe machine to increase its strength so that it is not easy to get hair on the belly during dyeing. This method of wrapping wire cannot be twisted on an ordinary ring twisting machine, because when twisting with a ring twisting machine, the twist is concentrated in the details, and the thick parts of the belly cannot be wrapped with twist, so the twist is added Hollow spindle twisting machines or wrapping machines are often used for yarn production.
Big belly yarn
Bamboo Knot yarn
Causes of formation of big-belly yarn
(1) Equal-length fibers are concentrated but not stretched to produce bunching;
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(2) The fibers are sticky and tangled, and the combing and drafting cannot be done;
(3) The front roller pressure is insufficient;
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(4) The friction force in the middle is too strong and the control force is too large;
(5) The top roller is too thin or cracked or lost Flexibility etc.
Big belly yarn spinning method and equipment
1. Spinning frame produces big belly yarn
Equipment: spinning frame
Method: Use electromagnetic clutch to stop the front roller When the clutch is closed, the fibers sent out by the middle and rear rollers are accumulated behind the front rollers. When the clutch is closed, the accumulated fibers are taken away to form a big belly
Disadvantages: affected by the wire ring and winding Due to the limitation of the installation, the spinning should not be too coarse. The average count is about 6 inches (97tex). It is difficult for the wire ring to pass through if it is too large.
It is suitable for the production of smaller belly yarn.
2. Roving frame produces big belly yarn
Equipment: wool spinning B465 roving frame
Method: Use the middle and rear rollers to overfeed the production. The output of the front rollers merges with the core wire and then enters the hollow spindle bar to add the wrapping wire.
Reinforcement of knotted yarn:
On the wrapping machine, the big belly yarn passes through two rows of hollow spindle tubes to make a package yarn. , there are wire-wrapped tubes on each of the two rows of hollow spindle tubes, and the two rows of hollow spindle tubes turn in opposite directions, so that the two consolidation yarns can be wrapped on the big belly yarn with S twist and Z twist respectively, so that it can be formed at one time , but the original twist of the roving cannot be retreated.
Disadvantages: Hard feel
Fancy twisting using a combination of hollow spindles and ring spindles Machine reinforcement of knotted yarn
Method: The original roving has 40 twist/mS direction, add 80 twist/mZ direction for the first time, and then wrap the hollow spindle with 80 twist to make the consolidated yarn It is 80 twist/mS direction, while the roving itself has only 40 twist/mS direction. The second time, the same method is used to add 40 twist/mZ direction, so that the original 80 twist/mS is reduced by 40 twist and there is still 40 twist/mS, while the roving itself is completely withdrawn with 40 twist/mS, which is exactly zero twist. At the same time, the hollow spindle is The consolidating yarn is added with 40 twist/m in Z direction, so that the surface of the big belly yarn is cross-wrapped with two consolidating yarns with 40 twist/m in opposite twist direction.
Advantages: good fluffiness, soft feel
Big belly yarn spinning raw materials
Pure cotton, pure acrylic, pure polyester, polyester-cotton blend, nylon-nitrile blend, cotton-nitrile blend, wool-acrylic polyester blend, cotton-nitrile Polyester blends, etc.
The raw materials are mainly wool-type long fibers such as wool and acrylic fiber.
Application of belly gauze
Taking Properties: The fabric woven with this yarn has protruding patterns and strong three-dimensional effect.
Generally used in knitting and machine weaving such as towels, sweaters, scarves, etc.
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