High-speed spinning method of polylactic acid fiber

Abstract

Disclosed is a high-speed spinning method of polylactic acid fiber. The method includes steps of introducing polylactic acid high polymer particle in a screw extruder to melt and extrude; after being filtered, introducing a metering pump; after metering, introducing to a spinning box to spin; stretching strands through an annular blowing air-cooling device and an oiling device orderly; introducing to a silk holding barrel after being delivered and cut off by a feeding device, and obtaining the polylactic acid fiber. The high-speed spinning method of the polylactic acid fiber is characterized in that the annular blowing air-cooling device includes a cooling cylinder in which an inner guide flow sleeve is provided; a surface cooler, which is arranged between the cooling cylinder and the inner guide flow sleeve; the oil feeding device includes an oil disk on which an upper oil wheel is provided; an oil disk supply pipe of which oil outlet is stretched to an oil disk cavity; a self-circulation adjusting mechanism of the oil disk agent is connected with the oil disk bottom plate; the feeding device comprises a column body, and the middle thereof is provided with a strand absorbing hole, a strand transition cavity and a strand center guide hole; one side of the column body is provided with a lifting groove; a gas cavity sealing ring, which is fixed with the column body; a lifting groove opening and closing cover, which is arranged on the column body. The high-speed spinning method can meet the rapid cooling of melt strands and oil application of high-speed spinning, and ensure the spinning quality.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid melt or polylactic acid polymer particle spinning, and in particular relates to a high-speed spinning method for polylactic acid fibers. Background technique [0002] The technical information of polylactic acid fiber spinning can be seen in the published Chinese patent documents, such as CN104294384A (polylactic acid fiber super-spinning process), CN104562252A (polylactic acid fiber adjustment spinning, false twist integrated system), CN105369417A (polylactic acid fiber Fiber composite spinning process and device), CN105803565A (polylactic acid matte fiber direct spinning production process) and CN105714391A (polylactic acid two-component composite fiber spinning process), etc. [0003] Through the reading of the above-mentioned patent documents that are not limited to examples and combined with the spinning technology commonly used at present, it can be known that the flow process of the...

AI Technical Summary

Problems solved by technology

The surface of a pair of godet rollers 40 of the wire feeding device with this structure is coated with an aluminum oxide film layer, which will easily fall off after thermal expansion and contraction, and cause the roller surface to be rough, easily damaged and the tow 60

In particular, due to the adoption of a pair of godet rollers 40, the drawn tow will be in a spring-like crimped shape, requiring secondary drafting in the subsequent process, otherwise the orientation of the tow will be seriously affected

[0015] the above Figure 12 The wire feeding device has at least the following four disadvantages: first, because the wire feeding is all mechanical, the wire feeding speed is affected, and it is difficult to meet the high-speed spinning requirements; second, because the tow is in contact with the roller body, Therefore, on the one hand, it is easy to affect the orientation of the tow, and on the other hand, it will cause damage to the tow; third, because the speed of high-speed spinning is as high as 6000-8000m / min, or even higher, if the spinning assembly's spinning If the spinneret holes of the spinneret cannot be ejected smoothly (affecting the spinning speed), the melt at the exit of the spinneret, such as the polylactic acid fiber spinning melt, will still appear puffed, and puffing is a taboo that affects the evenness of the silk , especially when the wire feeding speed of the wire feeder and the spinning speed cannot be ideally adapted, the above-mentioned puffing situation will become more and more serious; Fourth, due to the mechanical traction type wire feeding, it is not only impossible to produce the cohesion effect of the tow It may even cause the tow to diverge

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