Process for spinning low-melting-point heat bonding polyester filaments

Abstract

The invention provides a process for spinning low-melting-point heat bonding polyester filaments. A fully drawn yarn (FDY) spinning and drawing integrated machine is selected in the whole process. The process comprises the following steps of: heating uncrystallized polyester chips with the melting point of 110 to 130 DEG C to the temperature of between 50 and 60 DEG C under the vacuum degree of -0.1 to -0.096Mpa, drying for 3 to 4 hours, and crystallizing; heating the crystallized polyester chips to the temperature of between 65 and 75 DEG C, and drying for 18 to 20 hours to obtain polyester chip raw materials with moisture content of less than 0.005 percent; performing screw extrusion and lateral blowing in turn, oiling, absorbing moisture, adding into a channel, and drawing between a first heat roller (1) and a second heat roller (2) until the length is 1.47 to 1.71 times that the original length to form filament fibers; and winding to form finished low-melting-point filament products. By the process, the phenomenon that the chips are caked and adhered to walls during drying is avoided, spinning and drawing speeds are improved, the postprocessing procedure is eliminated, loss is reduced, the yield of a machine is improved, product quality is improved, and production cost is reduced.

Description

technical field [0001] The invention belongs to textile and functionalized chemical fibers, in particular to a spinning process for thermally bonding polyester (polyester) filaments with a low melting point. Background technique [0002] The existing low melting point thermal bonding fibers mainly include low melting point thermal bonding fibers spun from different raw materials such as polyester (PET), polyamide (PA), polyethylene (PE), polypropylene (PP), among which there are There are short fibers and filaments; and low melting point thermal bonding fibers are divided into sheath-core composite fibers and 100% low melting point fibers. The so-called skin-core composite fiber, the melting point of the cortex is 150-180 ° C, only 20%, and the core is conventional fiber, accounting for 80%. The production is difficult and requires special equipment to produce, and the product range has great limitations; while 100% is low Melting point bonding filaments can replace sheath-...

AI Technical Summary

Problems solved by technology

[0003] But now for the polyester (PET also known as polyester) 100% low melting point thermal bonding filament with a melting point of 110-130 °C, the spinning process control requirements are high, because the uncrystallized polyester chips with a melting point of 110-130 °C have a low melting point and are dried Difficulty, if the drying temperature is too high, the slices will be agglomerated and stick to the wall; if the drying temperature is too low, the micro moisture in the slices will not drop down due to the low vacuum degree, and it will be difficult to form filaments

[0004] Conventional spinning can only spin virgin silk (undrawn silk), and the output of the machine is low. If the draft is not timely, the molecular structure will easily change, and the silk cake will be deformed and adhered to each other. Difficult winding, high rejection rate, poor dyeing uniformity

[0005] High-speed spinning can avoid sticking, and the silk cake will not be deformed, but its product has large elongation and low strength, so it cannot be used directly, and it must be drawn to meet the use requirements.

However, the yield is low and the loss is large during the drawing process

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