How does the raising process of Polar Fleece Velvet shape the quality of fabrics? ​

Principles and foundations of raising process​
As the core equipment for achieving raising process, the raising machine is equipped with specially designed needle rollers or licker-in rollers. When the grey fabric moves in the raising machine, these rollers covered with needles or thorns come into contact with the surface of the grey fabric. As the rollers rotate, the needles or thorns will hook the fibers on the surface of the grey fabric, and use mechanical force to pull the fibers out of the grey fabric and stand them up. ​
Before entering the raising process, the grey fabric made of polyester fiber is mostly in a state of lying flat or intertwined. The mechanical action of the raising machine breaks this balance, causing the fibers to move out of their original positions and form a three-dimensional fluff structure. This process is not a simple physical pulling, but to allow enough fibers to stand up and build a fluff layer while ensuring the integrity of the fibers. ​
Different types of raising machines have differences in the design of needle rollers or licker-in rollers, running speed, pressure adjustment, etc., and these differences will directly lead to different raising effects. The density, length and sharpness of the needles will affect the grip and pulling force of the fiber, and then affect the final shape and density of the fluff. ​
The influence of the degree of pile on the quality of polar fleece ​
The degree of pile is a key factor in determining the quality of polar fleece. If the degree of pile is too light, the number of fibers standing on the surface of the grey fabric is insufficient, the fluff is sparse and short, and it is impossible to form enough air chambers. The air chamber is an important structure for polar fleece to achieve good thermal insulation performance. Insufficient chambers mean that heat is easily lost, and the thermal insulation effect is greatly reduced. At the same time, sparse and short fluff will also make the feel of polar fleece rough, lacking a soft and delicate touch, affecting the wearing and use experience. ​
If the degree of pile is too heavy, although the fluff will become denser and fluffier, the mechanical force on the grey fabric fiber is too large, and it is easy to break and damage the fiber. After the fiber is damaged, the strength of the fabric decreases, and it is more likely to cause wear and tear during use, which greatly shortens the service life of polar fleece products. Moreover, excessive raising may also cause the fluff to tangle together, forming an uneven surface, affecting the appearance of the polar fleece. ​
The ideal raising degree can form a uniform, plump and long fluff layer on the surface of the grey fabric. Such a fluff structure can not only effectively retain air and enhance the warmth performance, but also give the polar fleece a soft and smooth touch and improve the overall quality. Whether it is used to make clothing, household items or other products, the advantages of polar fleece can be demonstrated. ​
Key control points of the raising process ​
In order to achieve the ideal raising effect, there are many key control points in the raising process. The first is the pretreatment of the grey fabric. Before the grey fabric enters the raising process, its own state will affect the raising effect. The moisture content of the grey fabric, the relaxation degree of the fiber, etc. If the moisture content of the grey fabric is too high, the fiber will become soft and more easily pulled, deformed or even broken during the raising process; if the moisture content is too low, the fiber will be too stiff, the raising difficulty will increase, and it will not be easy to form uniform fluff. Therefore, the grey fabric needs to be properly dried or humidified to adjust to the appropriate moisture content. At the same time, through a specific pretreatment process, the grey fabric fibers can reach a suitable relaxation state, which is convenient for the raising operation. ​
The parameter setting of the raising machine is also crucial. The speed of the needle roller or the licker-in roller determines the frequency and strength of contact with the grey fabric. If the speed is too fast, the number of times and strength of pulling the fiber per unit time will increase, which is easy to cause excessive raising; if the speed is too slow, the raising efficiency will be low and it will be difficult to achieve the ideal raising degree. The pressure between the roller and the grey fabric also needs to be accurately adjusted. Excessive pressure will aggravate fiber damage; too little pressure will not have a significant raising effect. The running speed of the grey fabric in the raising machine will also affect the uniformity and effect of raising. The appropriate running speed can ensure that all parts of the grey fabric can be evenly raised to avoid excessive or insufficient raising of local areas. ​
The experience and technical level of the operator should not be ignored. Even with advanced raising equipment and clear process parameters, the operator still needs to make adjustments according to the real-time status of the grey fabric during the actual production process. Observe the surface condition of the grey fabric after raising, judge whether the density and length of the fluff meet the requirements, and fine-tune the parameters of the raising machine in time. Skilled operators can keenly perceive subtle changes, ensure the stable progress of the raising process, and produce high-quality raised grey fabrics. ​
Relationship between raising treatment and subsequent processes​
The grey fabric after raising treatment is not the final product, and it needs to go through subsequent processes such as polarization, and the raising effect will directly affect the progress of subsequent processes and the quality of the final product. Polarization is to curl the fluff after raising into granules. If the raising degree is not appropriate, it will bring difficulties to polarization. If the raising is too light, the fluff is short and sparse, and it is difficult to curl into an ideal granule. The granules are not full and uneven, which affects the appearance and warmth retention of Polar Fleece Velvet; if the raising is too heavy, the fiber is severely damaged, and it is easy to break during the polarization process, resulting in a large amount of fluff debris, which not only affects the production environment, but also reduces the quality and durability of the product. ​
The state of the fluff after raising will also affect the dyeing effect. If the fluff is too dense or entangled, it will make it difficult for the dye to penetrate evenly, resulting in uneven dyeing; and if the fluff is sparse and the surface is uneven, the color effect after dyeing will also be poor. Therefore, the raising process must be closely coordinated with the subsequent process to create good conditions for subsequent processing. ​
Development and innovation of raising process​
With the continuous advancement of textile technology, the raising process of polar fleece is also developing and innovating. New raising equipment is constantly emerging, and these equipment have been optimized in terms of structural design, automatic control, etc. For example, a more precise needle roller or licker roller manufacturing process is used to improve the quality and stability of needles or thorns and reduce damage to fibers; equipped with advanced sensors and control systems, it can monitor the raising state of the grey cloth in real time and automatically adjust the parameters of the raising machine to improve the accuracy and efficiency of production. ​
There are also new attempts and breakthroughs in process methods. Some manufacturers have begun to explore the combination of chemical treatment and mechanical raising. Before raising, the grey cloth is subjected to specific chemical treatment to change the surface properties of the fiber, making it easier to stand up and form. This can not only improve the raising effect, but also reduce damage to the fiber, and produce polar fleece products with better quality. ​
For polar fleece products with different uses and needs, the raising process is also being personalized. The polar fleece used to make baby clothes has extremely high requirements on the softness and fineness of the fleece. The raising process will focus more on gentle handling to avoid damaging the fibers while ensuring the extreme softness of the fleece. The polar fleece used for industrial labor protection products places more emphasis on the wear resistance and strength of the fleece. The raising process will enhance the compactness and firmness of the fleece while ensuring a certain softness.