JPS58149335A - Wet yarn-spinning process - Google Patents

Abstract

PURPOSE:When a fiber bundle is predrafted, wetted, squeezed and main-drafted, water is further added to the bundle to effect uniform wetting of the yarn, thus preventing uneven drafting, filament-winding around the draft rollers. CONSTITUTION:The fiber bundle Y is predrafted with rollers 1,1' and 2,2' in the predrafting zone and water is added from the whirl nozzle 3 to the bundle Y to wet the outer periphery of the yarn. Then, water is jetted perpendicularly to the axis of the yarn Y toward the center of the yarn from the jet nozzle 4 to wet the core part of the yarn. The yarn is made to pass through between squeezing rollers 5,5' to move the excessive water to the outer layer, resulting in uniform wetting all over the yarn. The yarn is squeezed with the nozzle 6 to reduce the water and further squeezed with the back rollers 7,7' in the main drafting zone M. Subsequently, water is supplied from the nozzle 8 to make the yarn contain a certain amount of water, drafted with rollers 7,7' and 9,9', false- twisted, dried and wound up.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for wetting fibers or rovings (hereinafter referred to as fiber bundles) in wet spinning.

BACKGROUND ART Conventionally, as general methods for wetting fibers in wet spinning, there have been known methods such as immersing a fiber bundle in a solution and pouring a solution into a fiber bundle.

First, as a method of immersing a fiber bundle in a solution, there is a method described in, for example, Japanese Patent Application Laid-Open No. 48-44535. In this method, the roving is immersed in a solution, then fluffed, false-twisted, and wound up.

In this method, as mentioned above, the roving is immersed in a solution and moistened, so the outer layer of the roving can be easily wetted, but air remains in the center of the roving, making it difficult to wet the roving. There is a difference in moisture content between the outer and inner layers of the roving.

As a result, the draft behavior of the fibers in the inner and outer layers is different, causing draft unevenness, and the wet roving is squeezed by the pack loaf in the draft zone, which reduces the moisture content of the roving in the draft zone. There are disadvantages such as fibers winding around the draft loaf because the amount of water contained in the yarn becomes too low.

Next, how to inject the solution into the fiber bundle.

For example, there is a method described in JP-A-47-72425. This method involves injecting the solution into the roving through a pipe and wetting it, so the surface of the roving on the side where the liquid is poured is easily wetted, but the surface of the roving on the opposite side of the roving is not wetted. <<, and since air remains in the center of the roving, the inner layer is more difficult to moisten than the outer layer. In addition, since the roving is squeezed by the pack loaf in the draft zone, the moisture content of the roving in the draft zone decreases, and as in the case of dipping described above, uneven force may occur or the fibers may wrap around the draft loaf. There are drawbacks such as.

The present invention aims to provide a wet spinning method that overcomes these drawbacks.

That is, the present invention provides a wet spinning method in which a fiber bundle is predrafted, subsequently moistened, squeezed, first main drafted, false twisted, dried, and wound.

This wet spinning method is characterized in that water is supplied to the squeezed fiber bundle during the main draft of the fiber bundle.

1-J, below, the structure of the present invention will be explained in detail. FIG. 1 is a simplified process explanatory diagram showing an example of a wet spinning method related to 9-spinning. First, the fiber bundle (Y) is pre-drafted with pack rollers (1), (1') and 70-fold rollers (2), (2').

Next, the fiber bundle σ) is supplied with water from the vortex water supply nozzle A/(3) to moisten its outer layer, and then the fiber bundle (Y) is fed at right angles to the axial direction of the fiber bundle (Yl) and the center of the fiber bundle (Y). Water is supplied from the vertical water jet nozzle /L/(4) toward the center to moisten the center.Next, the fiber bundle (Yl is passed through between the squeeze loaves (5L C5'> (Yl
The excess water contained in the center of the body is transferred to the outer layer.

The fibers of the entire fiber bundle (Yll) are uniformly wetted by making the internal moisture content of the fiber bundle (Yll) equal. Next, the aperture nozzle I
v (6) K: After squeezing the fiber bundle (Yl) to reduce its moisture content, the main draft zone (Ml's bank rollers (7), (7') further squeezes it to create a smooth main draft. Temporarily reduce the moisture content to a predetermined moisture content that is lower than the constant moisture content required for the pack loaf (
7), The moisture content of the fiber bundle (Y) at the location (7') is always set to a predetermined value to reduce fluctuations in the moisture content at the location. Next, a predetermined amount of water is supplied from the water supply nozzle (8), and the fiber bundle (Y) is accurately hydrated with a certain amount of moisture necessary for smooth drafting.
7), (7') and front loaf (season, (9')
), the main draft is made and the 9th false twist nozzle/l1
False twist is given by 0Q and spun as yarn (Y').

This is pulled out using a drawer loaf (Ql), (11') and is then pulled out using a conventional drying device and winding device (not shown).

Dry and roll.

In addition, in the case of 9 or more, the fiber bundle (to wet the outer layer of Yl, water is sprayed from the vortex water supply nozzle yv (3) to form the fiber bundle) while giving a false twist to the fiber bundle. A method of wetting the fiber bundle is used, but in addition to this method, the fiber bundle is
A method of introducing water into the fiber bundle (not shown) and letting water flow out from the entire inner surface of the nozzle to wet the outer layer of the fiber bundle passing through the nozzle, or simply directing water to the outer layer of the fiber bundle passing through the nozzle. Any method, such as a pouring method, may be used as long as it can achieve the purpose of moistening the outer layer of the fiber bundle. In addition, in the explanations above, water is used to wet the fiber bundle, but an aqueous solution containing a surfactant, a glue, etc. may also be used outside the water plate, or the outer layer may be wetted with water. The wetting liquid in the central part and the wetting liquid from the water supply nozzle in the main draft zone may be the same or different. Furthermore, the water content of the fiber bundle (■) is squeezed out by the squeeze nozzle tv (6), but in this case it is necessary to squeeze it sufficiently, so that the next main draft zone pack loaf (7)
, (7') enables stable aperture with little fluctuation in the curvature, thereby reducing the amount of water to a predetermined amount, and furthermore, the subsequent water supply nozzle/
By supplying a predetermined amount of water from L' (8), it is possible to cause the fiber bundle σ) to contain a certain amount of moisture that allows a smooth main draft.

As described above, in the wet spinning method according to the present invention, first, all the fibers in the outer layer and the center of the fiber bundle are uniformly wetted, and the first step is sufficiently squeezed to reduce the amount of water below the amount necessary for smooth drafting. A 5-step water supply process is performed in which the moisture content is set to a predetermined level, and then water is supplied during main doffing 7F to provide the fiber bundle with the constant moisture content necessary for stable drafting. This method enables high-speed wet spinning without any problems, and is a great invention that contributes to improving productivity and quality.

Next, although examples are listed below, the technical scope of the method of the present invention is as follows:
It is not limited to this.

Example FIG. 1 shows the wet spinning process according to the method of the present invention.

1.4 denier 52 mm hot water soluble polyviny μ
A sliver (500 gel/6 yards) (Y) made by blending 12 g6 of alcohol fiber and 88 g of cotton fiber was supplied.

After pre-drafting the sliver by 5 times in the pre-draft zone CPI, the outer layer of the sliver (1) is wetted by water supply at a water pressure of 1 #/d using the vortex water supply nozzle (3).9 Next, the vertical water supply jet nozzle (4) After wetting the center of the sliver (i+) by supplying water with a water pressure of 1#/d.

Between the aperture lobes (s), (5') the sliver (
b) to transfer excess moisture in the center to the outer layer,
Subsequently, the sliver (7) is
After squeezing the main draft zone, open the water supply nozzle (8
) to supply 12 g/min of water to the Swiper tank,
When the moisture content is 260 to 280% of the sliver, perform 24 times main draft and 9th false twist nozzle A/Q
l) Steam pressure 2.4 kg/, d from IC,
False twist at 135℃ to create 20'S yarn (Y') and -
This was pulled out using a drawer loaf Ql), (11''), dried in a drying drum at 220°C, and rolled up into cheese.The particles in this case were very good.

[Brief explanation of the drawing]

FIG. 1 is a simplified process explanatory diagram of an example of the wet spinning method according to the present invention. (Yl...11 bundles, (Y')...yarn, ψ)...
・Pre-draft zone* (1) (11)...ψ)
Pack loaf I (2) (2')...CP+ front loaf, (3)...vortex water supply nozzle, (4).
・Vertical water supply jet nozzle, (5), C5')
-...Aperture roller, (6)...Aperture nozzle, side)...
・Main draft zone, (71, (7... sides) pack loaf, (8)... water supply nozzle, (9), (
9')... (Front loaf of Ml, (10-... false twist nozzle, α]), (11')... Drawer loaf. Patent applicant Unitika Co., Ltd.

Claims (1)

[Claims] (1) Pre-drafting the fiber bundle, followed by wetting. After squeezing, main drafting, and false twisting. A wet spinning method in which water is supplied to the squeezed fiber bundle during main drafting of the squeezed fiber bundle.