hollow fibers
hollow FibersNatural origin The most important natural sources for the preparation of these fibers are plant cellulose. Acetate and viscose Rayon are similar to these fibers.Artificial originThe production of synthetic fibers is usually made from synthetic polymers, which are actually gas and oil derivatives.
Types of fibers Hollow fiber production Hollow Fiber is produced in different ways. In the following text, we will examine these methods:Spinning meltingOne of the simplest, fastest, and most economical methods for producing these fibers is the melt spinning method.
This method is suitable for meltable polymers or thermoplastics.
Protein and cellulosic polymers are thermoset so they can not be melted because they will be destroyed at high temperature.
The first step in melt spinning is the polymer synthesis step. In the next step, the polymer enters the spinning factory in the form of
chips, granules, powder or sheets.
Then the solid polymer becomes a molten material. This material must be capable of spinning. The next step is the extruder stage, which means melting, mixing and homogenization.
The design of this step is very important because it will affect the final fiber and properties of the melt. Impurities are separated inside the extruder. If the impurities remain in the structure, they cause tearing.
Then, the molten material enters the string maker and after passing through it, it becomes a fiber string.The next step is freezing or cooling, which is very important in spinning and melting. If cooling is done at a high speed, the fibers will be frozen without forming so their amorphous percentage
will increase.
The next step is stretching, which takes place in two stages. One stage is due to the difference in speed between the feeding pump and the pick-up roller, and the other stage takes place in the stretching area which consists of two pairs of rollers. Nylon and polyester are prepared in this way.
