It was invented by DuPont of the United States. The principle is to use compressed air as power to cause a series of physical changes such as opening, displacement, entanglement and formation of loops in the nozzle of chemical fiber filaments, so as to obtain the structure and performance of the original silk Textured yarn with big difference.
Its characteristic is that there are many loops of different shapes and sizes distributed on the surface of the yarn, which is similar to the hairiness of spun yarn; the yarn body is a complex mixture composed of multiple monofilaments intertwined, twisted and entangled. structure. These characteristics determine that it has excellent properties of imitating yarn and wool. The processed textured yarn has the properties of both filament and spun yarn, with strong wool feeling, good hand feeling, and better coverage than spun yarn.
Principle of Air Deformation
Air deformation is mainly achieved through air deformation nozzles. After spraying water, the thread enters the nozzle, and is blown away and chaotically by the compressed air jet in the nozzle, and then accelerated in the accelerated wire feeding tube. When leaving the nozzle, each monofilament remains basically parallel. When leaving the nozzle chamber, the filament will turn at 90° to generate curved loops of different sizes. A certain length of free silk segment appears due to overfeeding. While the silk strands are intertwined, a network is formed above the bending point to form the basic structure of air-textured yarn. According to the different requirements of the product, it can be used for shaping or cutting loop processing in other mechanisms of the air texturing machine to produce fluff similar to spun yarn on the surface of the thread.
According to the number of strands fed into the raw silk and the difference in overfeeding, there are three main processing techniques for air textured yarns: single-strand parallel yarn; double-strand parallel yarn; double-strand core yarn.
Structural characteristics of ATY
The morphological structure of ATY consists of two parts: one is the surface loop part of the yarn, and the other is the yarn core part.
The surface of ATY is composed of many wire loops, and the aggregate shape and size of the wire loops are different. But for a certain loop, it has certain geometric characteristics, that is, the maximum height H perpendicular to the core yarn and the maximum width W parallel to the core yarn. According to this, the loop can be divided into three categories:
①H/W≥1 is called "circle";
②0.5≤H/W＜1 is called "half circle";
③H/W<0.5 is called "arc".
02.Yarn core structure
The shape of the ATY surface loop determines its appearance, feel, bulkiness, etc., while the core yarn structure of ATY determines most of its physical properties. The structure of ATY yarn body is quite complex, mainly composed of parallel yarn (similar to untwisted silk), intertwisting, network, similar ply yarn and other areas. Among them, the entanglement and twisting run through the entire yarn core. Some monofilaments are entangled with tows, and some tows are entangled with tows. Several forms appear alternately and mixedly, forming a complex yarn core structure. The structure of ATY yarn body generally changes with different processing conditions. Even under the same conditions, the frequency and form of several deformations have no obvious regularity. This is because in the air deformation processing, the power to deform the filaments— —The air jet field itself is an irregular vortex field, and the energy distribution changes rapidly.
Network wire, textured wire, air textured wire
In the spinning process of chemical fiber, each filament is not a single filament but a multifilament composed of 15-100 very thin filaments. If in the spinning process, compressed air is used to loosen the filaments, and they are rotated and twisted into a network shape, which becomes a network filament. This kind of silk has high strength, no need for twisting and sizing during weaving, and desizing is not required for dyeing and finishing, so it is also called "free sizing". The fabric made of network silk has a particularly good wool-like feel.
After the chemical fiber is processed and spun, the silk or chemical fiber yarn that undergoes deformation treatment (such as strong twist, false twist, non-stretch deformation, etc.) becomes a textured yarn. Such as strong nylon yarn, expanded acrylic yarn and so on.
Air textured yarn, also known as ATY, is a variety of chemical fiber filament. It uses compressed air to deform chemical fiber filaments and partially form small loops in the outer ring, and then break them to form a number of head ends exposed, thus approaching the "yarn" spun with short filaments according to the conventional method. At present, polyester, polypropylene, nylon, viscose, acetate, etc. all have air textured yarns. Air textured yarn can be used to make spun silk, cotton-like or wool-like fabrics.