What is the knowledge about wool

Update: 09-11-2020
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Yarn usually refers to yarn spun from wool, and there a […]

Yarn usually refers to yarn spun from wool, and there are also woollen yarn threads spun from different types of chemical fiber materials, such as acrylic fiber, polyester fiber, and Persian fiber. Metric count. The length in meters of a fiber or yarn weighing 1 gram at a given moisture regain. The finer the fiber or yarn, the higher the metric count. The thickness of hemp fiber and wool yarn, wool-type chemical fiber pure and blended yarn, as well as spun yarn and ramie yarn are indicated by the metric count. The metric count of the strand is indicated by dividing the nominal count of the single yarn that makes up the strand by the number of strands. The strength of wool yarn and woolen yarn is closely related to the fastness of fabrics and production efficiency. Strength is the basis of fabric strength and elongation. Therefore, the strength and elongation of wool yarn and woolen yarn are important indicators of quality, because the strength and elongation directly affect its quality. , Requires proper strength and elongation. Too large raw materials will loosen the wool yarn and woolen yarn and reduce the strength; if the strength is too small, the strength will increase and the wool yarn and woolen yarn will become stiff. The strength and elongation of the wool yarn and yarn vary with the degree of use and processing, as well as the fiber arrangement. The quality of the raw material is good, the fiber arrangement is neat, and the twisting is appropriate, the higher the strength of the wool yarn and the higher the stretch performance.

 

Spinning is a science that studies the processing of short textile fibers into yarns. Yarns are generally made of many short fibers of varying lengths through splicing methods, as well as long continuous monofilament twists. Combined. In the spinning process, it is first necessary to remove imperfections, that is, preliminary processing of the raw materials, also known as the preparation of spinning raw materials. The types of raw materials are different, the types and properties of impurities are different, and the processing methods and art are also different. The primary processing methods of raw materials mainly include physical methods such as cotton ginning, chemical methods such as degumming of hemp, scouring of spun silk, and a combination of physical and chemical methods such as washing and de-grazing of wool. Loosening will be messy and close horizontally. The fiber is processed into a longitudinal order, and has a certain requirement of smooth yarn. It is necessary to turn the block fiber into a single fiber state, release the horizontal connection of the fiber raw material, and establish a strong vertical connection between the end and the end. The former is called The loosening of fibers is called the assembly of fibers. The loosening of fibers is to completely remove the transverse connection between fibers and fibers. However, fiber damage must be minimized. Fiber assembly is to make the loosened fibers renew Establish an ordered longitudinal connection, which is continuous, and the fiber distribution in the assembly should be uniform, and at the same time have a certain linear density and strength. The fiber assembly also needs to add a certain twist. The assembling process is not completed at one time. It takes multiple processing such as carding, drafting and twisting to complete the opening. It is to tear large fibers into small pieces and small fiber bundles.

 

Broadly speaking, the degumming of hemp is also a kind of Opening. As the opening action progresses, the connection force between the fibers and impurities is weakened, so that the impurities are removed, and the fibers are mixed at the same time. The opening action and the removal of impurities are not completed at one time. It is gradually realized through the reasonable configuration of tearing, striking and dividing. The carding effect is that the large number of dense combing needles on the carding machine further loosens the small pieces and small bundles of fibers into a single state, thereby further improving the loosening of the fibers. Solution. After carding, the transverse connection between the fibers is basically eliminated, and the effect of removing impurities and mixing is more sufficient. However, a large number of fibers are curved and have hooks, and there is still a certain transverse connection between each fiber. The earliest Spinning machine. The combing function of the combing machine is to use the comb to carry out more detailed combing under the state of holding the two ends of the fiber separately. The processing of the combing machine can eliminate short fibers and small defects under a certain length. Promote the fibers to be more parallel and straight.

 

Chemical fibers are generally not processed by the comber because of their neat length, less impurities, and good straight and parallel state.Drafting stretches the combed sliver until it gradually reaches a predetermined thickness. This process is called drafting. It laid the foundation for the firm establishment of regular end-to-end connection between fibers. However, drafting will cause unevenness in short segments of the yarn. Therefore, it is necessary to configure reasonable drafting devices and process parameters. Twisting Twisting is to twist the whisker around its own axis, so that the fibers parallel to the axial direction of the whisker are helical, thereby generating radial pressure to fix the longitudinal connection between the fibers.Winding winds semi-finished products or finished products into a certain form to facilitate storage, transportation and processing in the next process. This process is called winding. The winding process should be carried out continuously on the basis of not affecting the output and quality of the product, and efforts should be made to achieve continuous production between the various procedures to minimize the quality problems caused by the winding process. In short, the spinning process generally includes the functions of raw material preparation, opening, carding, impurity removal, mixing, drafting, merging, twisting, and winding, and some functions are achieved through multiple iterations.

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