The composition of the sprayed cotton is: polyester (a […]
The composition of the sprayed cotton is: polyester (a chemical fiber) sprayed cotton, also known as spray cotton, is a kind of non-woven fabric. The principle of the structure of the sprayed cotton is to spray the adhesive on both sides of the fluffy fiber layer. Because of the certain pressure during spraying and the suction force when the lower vacuum absorbs liquid, the inside of the fiber layer can also penetrate into the adhesive layer. The mixture, the fiber layer after spraying the adhesive is dried and solidified, so that the intersections between the fibers are bonded, and the fibers not bonded to each other still have a considerable degree of freedom. At the same time, in the three-dimensional network structure, many voids containing air remain. Therefore, the fibrous layer has a porous, high lofting warming effect. Since the sprayed cotton is added under the conditions of spraying, not under the impregnation conditions, and is not pressed by pressure after spraying, it is solidified and molded. Therefore, in the bonded state of the fibers, the intersections are mostly in contact, and the binder bridges are less agglomerated, which makes the sprayed cotton main reason for being loose, soft, and warm. According to the formation principle of the sprayed cotton structure, in order to obtain excellent physical and mechanical properties for the combined sprayed cotton, it is necessary to carry out research and selection on the selection of the fiber raw materials and adhesives, as well as the production process, wherein the selection of the fiber raw materials appears More important. The type and specifications of fiber raw materials play a decisive role in the quality of sprayed cotton products. According to the requirements of the sprayed cotton, the warmth, fluffiness and soft handfeel of the sprayed cotton must be well selected in terms of fiber fineness, length, curl, cross-sectional shape and surface treatment state. As we all know, the quality of synthetic fibers is determined by a combination of many performance indicators, including physical and mechanical performance indicators, stability performance indicators and processing performance indicators. The requirements for quality indicators are not identical for different production processes. As for the fibers used for the sprayed cotton, it is required that the fibers have a fine fineness, a high number of crimps and a high degree of curl, and the fibers have good cohesion with each other. Thus, the product has a high bulkiness, compressive elasticity and elastic recovery. The beginning of the curl is preferably three-dimensional spiral crimping, and the product's bulkiness and elastic recovery rate are obviously superior to those of the flat wave crimping; the high hollow ratio gives the product a higher heat retention rate and a lower specific gravity; The type of silk oil agent and the oil content and moisture regain of the fiber not only affect the processing performance, but also play an important role in improving the hand feeling of the product and eliminating the static phenomenon in the production process. The commonly used hollow spiral crimped polyester fiber has a fineness of 6.6 to 7.7 dtex and a length of 51 to 76 mm. The fiber of this specification has better comprehensive performance. If the fiber is too thin or too long, it will produce a soft and unfeeling hand feeling; if it is too short or too thick, it will be rough and hard. The curl is preferably a spiral three-dimensional crimp, and the commonly used number of crimps is 0.5 to 0.6/mm. If round hollow fiber is used, the hollowness is preferably 5~10%, and the hand feeling, elasticity and warmth can be greatly improved, and the amount of fiber can be correspondingly reduced. In the conventional polyester, 30~70% of feather-like fibers are mixed to produce feather-like cotton. The so-called feather-like fiber is actually a three-dimensional crimped hollow polyester fiber treated with silicone oil. The fiber is characterized by soft lubrication, the fibers are not entangled with each other, and the fluffiness is good. Therefore, the finished product can achieve elastic foot and feel. Sleek and fluffy with down characteristics.