Polyester wadding is one kind of nonwoven fabric, which is known as space cotton or vacuum cotton. It is made from natural cotton fibers, artificial fibers or synthetic fibers processed with loosening, carding, spraying, baking and curing.
Its fluffiness, high compression rebounding, resistance to both dry and wet cleaning, lightness and heat isolation have made itself one of the most important materials to be used in the production of cotton clothes, ski jackets, space suits, quilts, sleeping bags and other bedclothes, as well as some industrial supplies.
According to the formation principle of polyester wadding structure. Choices and surveys over fiber raw materials and bonding agents, along with production processes, have to be made to ensure good physical and mechanical performance. In which the choosing fiber raw materials has higher priority.
The type and specification of fiber raw materials have a decisive affect on the quality of polyester wadding products. As is requested by the application of polyester wadding.
Good choices for fiber fineness, length, curl degree, section shape and surface treatment status have to be made to ensure ideal heat isolation, fluffiness and soft touch.
As is known to synthetic fiber quality is the comprehensive composition of multiple indexes including mainly performance of physical machinery, stability, processing.
Different production processes might not have identical requirements for performance indexes. As for the fiber used in polyester wadding. Thin fiber fineness, a high number of crimps and curl degree, along with good fiber cohesion are required to guarantee good product elasticity and bulkiness.
It is remarkable that the beginning of the curl uses a three-dimensional spiral curl, while the bulkiness and rebound rate of the product are clearly superior to that of a flat wave curl; the high hollowness ratio gives the product a greater heat retention rate and a lower density.
The type of lubricant, oil content and moisture retention of the fiber not only affect the processing performance, they also play a key role in improving the feel of the product and eliminating any static electricity that may arise from this process.
The most commonly used virgin hollow polyester fiber has a thickness of 6.6 to 7.7 dtex, and a length of 51mm to 76 mm. Fibers of this specification have better performance as a whole; if it is overly short or thick, the feeling will become too rough.
Preferably the curl is a spiral three dimensional crimp along with the common number of crimp from 0.5-0.6/mm. the hollow fiber between 5% to 10% would be favorable in case of the use of hollow fiber, which helps improve the hand feeling, elasticity and heat isolation, meanwhile reduces the amount of fiber. Mixing 30-70% of down feather fibers in regular polyester enables the production of feather-like sprayed cotton.
What we call ‘feather-like fiber’ is actually solid polyester fiber refined by silicone oil and is soft, lubricant, fluffy and tangle free. As a result products made of which feel fluffy and smooth, sharing feather features.
In addition to the variety, quality, processing methods and conditions of fibers. The main factor affecting the quality of sprayed cotton is the adhesive emulsion quality.
There are two particular indicators of polyester wadding: the compressive resilience and water resistant.
The quality of the adhesive plays a decisive role in the performance of the polyester wadding. As the polyester waddings are used for different purposes, therefore, the material and product specifications are varied.
Based on the above, different adhesives differ in thousands of ways in the performance as well, so there are different types of adhesives with different performance levels.