A kind of low-melting point thermally bonded polyamide fiber filament and its preparation method

Abstract

The invention relates to the field of low-melting-point heat-bonded fibers, in particular to a low-melting-point heat-bonded polyamide fiber filament, and a preparation method therefor. The melting point of the low-melting-point heat-bonded polyamide fiber filament ranges from 75 DEG C to 95 DEG C, the strength ranges from 3.0 centinewtons per decitex to 4.5 centinewtons per decitex, and the elongation ranges from 30 percent to 40 percent. The preparation method comprises the following steps: copolyamide chips with the melting point ranging from 75 DEG C to 95 DEG C are used as raw materials, enter a channel after sequentially going through screw extrusion, cross air blasting, oil finishing and moisture absorption, and sequentially go through 1.47 to 2.6 times of drafting through first hot rollers, second hot rollers and third rollers to obtain the filter filament. The method provided by the invention has the advantages that copolyamide with a specific melting point serves as the raw materials, the one-step technique of FDY (fully drawn yarn) spinning, drafting and sizing is adopted, and the fiber filament is obtained after spinning, drafting and sizing sequentially through the three pairs of hot rollers (the six hot rollers) with different temperatures; the method is simple, and the prepared low-melting-point heat-bonded polyamide fiber filament has a low melting point and high strength, so that the production requirements can be well satisfied.

Description

Technical field [0001] The invention relates to the field of low-melting thermal bonding fibers, in particular to a low-melting thermal bonding polyamide fiber filament and a preparation method thereof. Background technique [0002] The existing low melting point thermal bonding fibers are mainly spun from different raw materials such as polyamide (PA), polyester (PET), polyethylene (PE), polypropylene (PP), etc. The low melting point thermal bonding fibers include short fibers and The difference between filaments; there is also a difference between the core composite fiber and 100% low melting point fiber. The so-called skin-core composite fiber, the melting point of the skin layer is 150-180℃, which only accounts for 20%, and the core is conventional fiber accounting for 80%. It is difficult to produce and requires special equipment to produce. The product range is very limited; and 100% is low. Melting-point bonding polyamide filaments can replace sheath-core fiber filaments ...

AI Technical Summary

Problems solved by technology

[0003] Conventional spinning can only spin as-spun silk (undrawn silk), and the output of the machine is low. If it is not drawn in time, the molecular structure will easily change, and the silk cake will be deformed and adhered to each other. It cannot be used directly, and it must be drawn. Only after the use requirements are met

When drawing, it will be difficult to unwind the primary silk, the yield rate is low, the loss is large during the drawing process, and the uniformity of dyeing and coloring is poor.

[0004] The application number is 200910029633.4, which discloses the production method of low-melting point thermal bonding fiber. It uses the copolyamide described in this patent as raw material and spinning method to spin a copolyamide filament fiber with a melting point of 80-150°C. The strength of the obtained low melting point thermal bonding fiber is not high enough