New technology for non-woven spunbond production

Today, due to overcapacity, spunbond producers face fierce competition in certain markets, and price wars have caused the already thin profits to fall. On the other hand, in some markets, products processed with non-polyolefin materials such as polyester are in short supply, and profits are far above average. Obviously, the technology used by manufacturers largely determines the market direction of their products. Moreover, recent market trends indicate that two-component technology is increasingly being used in spunbond products, and its unique properties are not available in a single material. For example, some bicomponent fiber products, after being spunbonded, are further processed to have a textile effect due to the microfibers, so that they can compete with conventional textiles and even replace them in some fields. Therefore, from the manufacturer's point of view, as important as the quality and reliability of the equipment, the technical capabilities and flexibility of the equipment.

Seek Winwin is one of the leading manufacturers of synthetic fiber processing equipment, accumulating more than 20 years of fiber spinning equipment and processing know-how, including two-component fiber processing technology.
Unique point of design

Spinning rods and melt distribution bottom spinning rods and the integrated piping design in the spinning rolls are unique in that the drum is round and heated by the road; the spinning pump and the melt line 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 inlet of the spinning pump and the spinning assembly through pipes of the same path, length, diameter and curvature; The distance between the inlets of each spin pack is 150 mm. The distribution of the melt from the inlet of the module to the individual spinnerets is the same, and the temperature and heating of the melt in the entire drum are thus kept uniform.
The advantage of this design is 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 path of the melt ensures the same residence time and condition, making the equipment suitable for different processing speeds, temperatures and materials used. This advantage is even more important in situations where production requires more flexibility.

Drafting slot

The drafting trough used in this experimental line has two characteristics: the ultrasonic nozzle; the length of the trough, that is, the distance from the nozzle outlet to the bottom of the trough is less than 210 mm. From the computer simulation of the airflow in the drafting trough, in addition to the supersonic speed in the drafting trough, the "wave" or "flap" shaped airflow in the lower part of the trough can be seen, and the filaments are "formed". The drafted airflow has the same shape as the airflow in the air. This "forming" drafting, which is exponentially increasing with the air velocity, constitutes the majority of the total drafting force of the drafting notch, and also makes the working energy of the entire device strong and efficient.

The adjustable spinning length and forming distance test line has two adjustable platforms, one with a spinning rod and the other with a drafting groove.
The length of the spinning is determined by the distance between the spinnerets. The size of the drafting grooves can be adjusted by lowering the height of the platform alone. 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 and 700 millimeters, which is one of the unique features of Ason technology. The ideal, minimum spinning length selected according to different product requirements maximizes the drafting force and achieves a high spinning temperature, thus ensuring the high spinning speed required (polypropylene above 6000 m/min, The spinning speed of PET exceeds 8,000 m/min), which also enables the processing of filaments of different fineness and different raw materials.

The key to the production of bicomponent fibers for the production of two-component fibers is that the spin pack is designed so that two different polymer melts extruded from two different extrusions reach the spinneret and form Different shapes of two-component monofilaments will not come together before. There are usually three different techniques for designing spinning assemblies of different cross sections.

1 thin layer (board) technology:
A multi-layer baffle is used to direct the two polymer melts through the assembly independently, forming fibers just prior to entering the spinneret micropores.
Advantages: All required cross-sections of bicomponent fibers can be produced by the same component through different layers of baffles, economical and flexible.
Disadvantages: It is difficult to seal long, different layers by the parameters of the raw materials such as different melt viscosities (matches in viscosity) and repeated operations.