Today, due to overcapacity, spunbond producers are facing fierce competition in certain markets, and price wars have caused originally thin profits to fall again and again. On the other hand, in some markets, products processed with non-polyolefin raw materials such as polyester are in short supply, and the profits are far beyond the average level. Obviously, the technology adopted by manufacturers largely determines the market direction of their products. Moreover, some recent market trends indicate that two-component technology is increasingly used in spunbond products, and its unique characteristics are not available for a single raw material. For example, some bicomponent fiber products are further processed after spunbonding, which will have the effect of textile due to ultra-fine fibers, which can be comparable to traditional textiles and even replace them in certain fields. Therefore, from the manufacturer's point of view, as important as the quality and reliability of the equipment are the technical capabilities and flexibility of the equipment.
Newmag is one of the leading producers of synthetic fiber processing equipment. It has accumulated more than 50 years of fiber spinning equipment and processing know-how, including two-component fiber processing technology. In order to be able to better respond to customer needs, Newmag decided to launch a new technology in the spunbond market-Ason spunbond technology. In 2003, an experimental production line with a door width of 1.2 meters was put into production in December 2003.
Unique points of design
Spinning roller and melt distribution The bottom spinning roller and the piping integrated into the spinning roller are unique in that the drum is round and heated by Daosheng; the spinning pump and melt piping are built in The heating part of the drum; the insulation of the drum and the spinning box is very powerful and effective; the multi-strand melt flows from the main pipe to the entrance of the spinning pump and spinning assembly through the pipe with the same path, length, diameter and curvature The distance between the entrances of each spinning module is 150 mm. The distribution of the melt from the inlet of the module to each spinning plate is the same, and the temperature and heating of the melt in the entire drum are therefore kept uniform.
The advantages of this design are obvious. In the range of 180 to 310 degrees Celsius, the temperature difference of the entire drum is less than 1 degree Celsius, which is very important in the high-speed spinning process. The same melt path ensures the same residence time and conditions, and also makes the equipment suitable for different processing speeds, temperatures and materials used. This advantage is even more important when production requires more flexibility.
Drafting groove
The drafting groove used in this experimental production line has two characteristics: ultrasonic nozzle; the length of the groove cavity, that is, the distance from the nozzle outlet to the bottom of the groove is less than 210 mm. From the computer simulation of the airflow in the drafting slot, in addition to the supersonic velocity in the drafting slot cavity, at the same time, you can also see the "wave" or "flap" shaped airflow at the bottom of the slot, which produces "forming" of the filament. The draft airflow has the same shape as the airflow in the air. This "forming" draft that increases exponentially with the air velocity constitutes the vast majority of the total drafting force of the drafting slot, and also makes the whole device work with strong energy and high efficiency.
The experimental production line with adjustable spinning length and forming distance has two adjustable platforms, one containing a spinning stick and the other with a drafting groove.
The spinning length is determined by the distance between the spinnerets, the size of the drafting groove can be adjusted by individually reducing the height of the platform, and the forming distance can also be adjusted by moving the top and bottom platforms together. It should be emphasized that the spinning length is less than 1.5 meters, preferably between 300-700 mm, which is one of the unique features of Ason technology. The ideal and minimum spinning length selected according to different product requirements maximizes the drafting force and obtains a high spinning temperature, thus ensuring the required high spinning speed (polypropylene higher than 6000 m / min, The spinning speed of PET exceeds 8000 m / min), which also enables this equipment to process filaments of different fineness and different raw materials.
The needle and barrier technology for the production of two-component fibers The key to the production of two-component fibers is that the design of the spinning assembly is such that two different polymer melts extruded from two different extrusion ports reach the spinneret and form Two-component single fibers of different shapes will not come together before. There are usually three different techniques to design spinning assemblies with different cross-sections.
1 Thin layer (board) technology:
A multi-layer baffle is used to guide the two polymer melts independently through the assembly, forming fibers just before entering the spinneret pores.
Advantages: All required cross-sections of bicomponent fibers can be produced by using the same component through different layers of deflectors, which is economical and flexible.
Disadvantages: It is easily affected by the parameters of the raw materials such as different melt viscosity (whether the viscosity is matched) and repeated operations, and it is also difficult to seal very long different layers.
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Zhangjiagang Mister Tools Co., Ltd , https://www.mingshitools.com