What are the advantages of fluffiness of three-dimensional hollow fibers? Why is it harder to compact than ordinary hollow fibers? ​

Three dimensional hollow fiberThe advantage of fluffiness and anti compaction properties of the hollow fiber stem from its dual innovation of "structural design+process strengthening". The performance differences from ordinary hollow fibers can be analyzed in depth from three dimensions: structural support, air interception, and rebound memory

1、 The core manifestation of fluffiness advantage

The three-dimensional hollow fibers with three-dimensional pore structure for air storage are formed into 1-4 three-dimensional hollow chambers through special shaped spinnerets (such as plum blossom shaped and three leaf shaped channels), and are given a spiral three-dimensional curled shape through processes such as "false twisting deformation". This dual pore structure of "hollow cavity chamber+curled gap" can trap a large amount of static air like a sponge - the hollow cavity chamber of a single fiber can store 30% -50% of its own volume of air, and the curled interweaving between fibers forms a micro scale mesh gap, making the air content inside the filling body more than 40% higher than that of ordinary hollow fibers.

The balanced design of lightweight and supportive hollow structure reduces the density of fibers themselves (the density of polyester three-dimensional hollow fibers is about 0.9g/cm ³, which is lower than that of solid fibers at 1.38g/cm ³), while the rigid support given by three-dimensional curling avoids the problem of "soft collapse". This characteristic allows the filling body to form a larger volume under the same weight. For example, when the quilt is filled with three-dimensional hollow fibers, the weight per square meter only needs 200g to achieve the fluffy thickness of ordinary hollow fibers of 300g.

By accurately controlling parameters such as stretching ratio and tension heat setting temperature (95 ℃), the processing technology can further enhance the fluffiness of fibers in production. Silicon treated three-dimensional hollow fibers can also reduce inter fiber friction, making the curled structure easier to stretch, and increasing the fluffiness by 15% compared to silicon free types.

2、 The key reason why it is harder to compact than ordinary hollow fibers

The three-dimensional curled "elastic support network" effect of ordinary hollow fibers is mostly a "linear hollow" structure, with fibers in a straight state, which is easy to adhere to each other, stack and compact when compressed. The spiral curling shape of three-dimensional hollow fibers is like countless miniature springs, forming three-dimensional cross support between fibers after filling, and only curling deformation occurs under pressure rather than structural collapse. Experiments have shown that after 5000 cycles of compression, the rebound rate of three-dimensional hollow fibers still reaches 92%, while that of ordinary hollow fibers drops to below 65%.

The advantage of the "anti collapse" structure of the hollow chamber is that the three-dimensional hollow fiber chamber is distributed in a three-dimensional manner around the axis, such as the four hole and seven hole designs, which form a balanced support structure for the fiber cross-section. When compressed, the chamber wall can disperse stress through elastic deformation. However, ordinary hollow fibers are mostly single pore linear chambers, which are prone to flattened collapse under pressure, resulting in deformation of the filling body. In addition,Three dimensional hollow fiberThe wall thickness has been optimized (usually 0.8-1.2 μ m) to ensure lightweight while also considering structural strength, further enhancing the anti compaction ability.

The synergistic effect of curling memory and material stability. During the spinning process, the three-dimensional hollow fibers form a stable spiral curling memory through the "heating stretching cooling shaping" process. Even if folded and stored for a long time (such as compressed packaging for 6 months), they can quickly recover their initial fluffy shape after being released. At the same time, the anti-aging properties of polyester and other raw materials (water washing resistance and UV resistance) make the crimp structure not easy to relax due to use loss, while ordinary hollow fibers lack crimp memory, and obvious stiffening will occur after 30-50 times of washing.