The decorative yarn of this kind of fancy yarn is wrapped around the core yarn and distributed in a wave or circle shape on the surface of the fancy yarn. It is the most diverse and widely used type of fancy yarn among fancy yarns.
Circle yarn
Loop yarn generates loops on the surface of the thread. There are large and small hoops. The decorative yarn of large hoops is thicker, so the finished yarn is also thicker. The small hoops can be spun finer. The linear density of loop yarn is generally 67~670tex (1.5~15 tex). When producing large loops, the decorative yarn must choose worsted wool yarn with good elasticity and uniform evenness, and the single yarn twist must be low. Tops (or rovings) can also be used directly as decorative yarns after drafting, which is called fiber-type loop yarns. This type of loop has a particularly soft feel because the fiber has not been twisted. Production on the ring spinning fancy twisting machine must go through two processes, while production on the hollow spinning spinning machine can be formed in one step. The most prominent feature of this type of fancy thread is the loop, so the decorative yarn should be made of better raw materials, such as wool, acrylic, cotton, linen, etc. It is not only used for knitted fabrics but also for woven fabrics and hand-knitted fabrics. With the development of technology, there are more and more types and colors of loop yarn, such as two-color, three-color, gradient, single-sided loop yarn, etc.
1. Two-color loop yarn: Two-color loop yarn is a new product developed in recent years. The entire fancy yarn is made of two-color loops. It can be produced by an ordinary double-roller or three-roller fancy twisting machine. The double-color yarn type Loop yarn only needs to be produced on a two-roller fancy twisting machine, while fiber type is produced on a three-roller fancy twisting machine.
2. Three-color loop yarn: This type of fancy yarn is characterized by a fancy yarn covered with three-color loops.
3. Gradient loop yarn: This type of fancy yarn must be produced on a four-roller fancy twisting machine. Its loops gradually transition from one color to the second color, without an obvious intersection of color alternation. For example, a black roving and a white roving enter the drafting mechanism at the same time. First, the white roving gradually changes from fast to slow, and the black roving gradually changes from slow to fast. On the surface of this fancy thread, it starts from white circles to light gray. , dark gray, black such a gradual process. If the gradient process is designed to be exactly the length of a garment's thread, the color of the garment will change from white → light gray → gray → dark gray → black. The transitional colors will be very harmonious and there will be no trace of handover.
4. Single-sided loop yarn: All loops of this fancy yarn are densely distributed on one side of the fancy yarn, so it is called single-sided loop yarn. The density of loops in this fancy yarn is very high, and the loops are Distributed one after another on the fancy yarn, the clothes made are very chic.
Corrugated yarn
Due to less overfeeding of the decorative yarn, curved corrugations are formed on both sides of the fancy thread, and the entire corrugated thread is distributed in a flat shape. Corrugated thread has a wide range of uses and is one of the most commonly used types of fancy thread. The suitable spinning density is 50~200tex (5~20 tex). Most of the raw materials are soft and uniform wool yarn, acrylic yarn, cotton yarn, etc. If this type of fancy yarn is produced on a ring-spindle fancy twisting machine, it requires two processes. When produced on a hollow-spindle fancy twisting machine, ring spindle untwisting is required, so it only needs one process to complete. This type of fancy thread uses a wide range of raw materials and has various thicknesses, so it is widely used in woven, knitted, worsted and woolen fashion fabrics, decorative fabrics and other products. There is also a derivative product of corrugated yarn, which uses a ring double roller fancy twisting machine for the first process. In the second process, instead of untwisting and strengthening the knotted yarn, two first yarns are merged and reversed. By twisting, the original core yarns are twisted together and the corrugated decorative yarn is expanded to all sides, resulting in a circular corrugated yarn with a very soft feel. The surface of clothing made of this kind of thread is covered with a dense layer of small waves, making it very comfortable to wear.
The production process of two-color corrugated yarn is different from the general one. It generates waveforms in two colors. One is that two colored yarns are bent to both sides to generate a two-color waveform. The other method is to feed rovings of two different colors into the drafting zone at the same time, and the two-color fiber after drafting becomes a two-color waveform. This type of fancy thread is thicker, usually 147~200tex (5~7 tex), and is used for fashion fabrics or decorative fabrics.
Towel yarn
The production process of this type of fancy yarn is basically the same as that of corrugated yarn. It often feeds two or more decorative yarns. Because the decorative yarn irregularly forms dense buckling on the surface of the core yarn and consolidation yarn, it looks like a towel, so it is called a towel line. Its raw materials are often mainly colored yarns, with red 13tex (77 denier) polyester-cotton yarn as the core yarn and consolidation yarn, and 13tex (120 denier) glossy viscose yarn as the decorative yarn to produce towel lines. The fabric using it as weft can form a layer of small white circles on the dark red background, like snowflakes, so it is called "snowflake".
Braid yarn
This kind of fancy yarn uses a strongly twisted yarn as the decorative yarn. During the production process, due to the overfeeding of the decorative yarn, its resilience in the relaxed state is kinked, resulting in irregular braids attached to the core yarn. And the middle of the consolidating yarn becomes the braid line. This type of braided yarn can be twisted with chemical fiber filaments, or ordinary wool yarn can be used to strengthen the twist. The suitable spinning range is 100~300tex (3~10 tex). Because the braid is made of strongly twisted yarn, it feels thicker and stiffer.