JPS60185824A - Method for wet spinning of hemp fiber - Google Patents

Abstract

PURPOSE:To wet spin hemp fibers without uneven nor broken yarns, by wetting a fiber bundle of partially hemp fibers, predrafting the bundle, squeezing the water with pressure rolls between a predrafting zone and a main drafting zone, drafting the bundle mainly in the main drafting zone, and false twisting the drafted bundle. CONSTITUTION:A fiber bundle 1 of at least partially hemp fibers is first supplied with water from a water supply nozzle 2, wetted, predrafted with a pair of back rollers 4 and 4' and a pair of front rollers 5 and 5' in a predrafting zone 3, passed through a pair of pressure rollers 6 and 6' provided between the predrafting zone 3 and a main drafting zone 7 to squeeze the water under a given pressure, drafted mainly with a pair of back rollers 8 and 8' and a pair of front rollers 9 and 9' in the main drafting zone 7 and false twisted in a false twisting nozzle 10 to give a yarn 1', which is dried and wound to spin the aimed hemp fibers.

Description

Detailed Description of the Invention The present invention provides fiber bundles such as slivers or rovings of hemp fibers or fibers blended with hemp fibers (hereinafter referred to as fiber bundles),
II, it relates to a wet spinning method in which fiber bundles at least partially consisting of hemp fibers are wet-spun.

Conventionally, methods described in Japanese Patent Publication No. 7662/1983 and Japanese Patent Application Laid-open No. 132230/1983 have been known as wet spinning methods in which stable fibers are moistened and drafted. In the case of fiber spinning,
When the spinning speed is higher than 20 m/min, there are problems in that misdrafting occurs, yarn unevenness, yarn breakage, etc.

The inventors of the present invention have solved the above problems.

As a result of various studies, it was discovered that misdrafts in wet spinning of hemp fibers and the resulting yarn irregularities and yarn breakages are caused by uneven moisture content in pre-drafted fiber bundles. The present invention was completed based on this knowledge.

That is, the present invention provides a wet spinning method in which a fiber bundle, at least a part of which is made of hemp fibers, is wetted and pre-drafted, then main-drafted, pre-combusted, dried and wound.
This is a wet spinning method for hemp fibers, which is characterized in that a pre-drafted fiber bundle is squeezed at a constant pressure by a pressure roller provided between a pre-draft zone and a main draft zone, and then main-drafted.

The present invention will be explained in detail below.

FIG. 1 is a simplified side view showing an example of essential parts of an apparatus for carrying out the present invention. The fiber bundle +11, at least partially made of hemp fibers, either alone or in a blend of hemp fibers and other natural fibers, synthetic fibers, etc., is first moistened by water supplied from the water supply nozzle (2), and then pre-prepared. Draft zone (
3) and a pair of bank rollers (4).

(a) and a pair of front rollers (5), (5'l), and then the main draft zone (
7) A pair of pressure rollers +61 provided between
．． 4g1, and during that time the liquid is squeezed at a constant pressure to adjust the moisture content to be almost constant, and then the main draft zone (7) is connected to a pair of bank rollers +81. [1
1 and a pair of front rollers (91, (d)), and then pre-combusted by a false twisting nozzle 00, spun out as yarn ω, dried by a drying device (not shown), and removed. The fiber bundle +11 is wetted with an aqueous solution containing water, an oil agent, or a sizing agent, and the false twisting by means of the temporary nozzle a is performed with steam or an air vortex.

In the present invention, pre-drafted wet fiber bundle fl+
As mentioned above, the pressure roller +61. is provided between the pre-draft zone (3) and the main draft zone (7). (σ), the liquid is squeezed at a constant pressure and the moisture content is adjusted to be almost constant, so in the subsequent main draft, the draft force is stabilized and the spinning speed is 20 m/min or more. There is no draft error even when the speed is 50m/mi.
Even at high speeds of n or higher, yarn unevenness or yarn breakage due to draft unevenness does not occur, and stable spinning can be maintained.

As described above, the present invention makes it possible to stably spin high-quality yarn at a much higher speed than conventional methods.

Next, examples of the present invention are listed.

EXAMPLE Using the apparatus shown in FIG. 1, linen line slivers (70 gel/6 yards) were first moistened by supplying water with a water supply nozzle, then drafted 2.5 times in a pre-draft zone, and then drafted with a roller. The water content in the sliver was adjusted to be almost constant by squeezing it with a pressure roller with a pressure of 5 kg, then drafted 8 times in the main draft zone, and then with an air pressure of 2.2 kg/c+J using a temporary combustion nozzle. False twist and spin at a spinning speed of 100 m/min.
' S (Ne,) yarn was spun and dried in a drying drum at 180°C to obtain I@. In this case, the spinning is good,
There were no problems such as yarn breakage, and high quality yarn with no yarn unevenness could be spun very smoothly.

On the other hand, when the pressure roller was not used, yarn breakage occurred frequently even at a spinning speed of 2 Qm/min, and a yarn with many irregularities was obtained.

[Brief explanation of the drawing]

FIG. 1 is a simplified side view showing an example of the essential parts of an apparatus for implementing the present invention. (11... fiber bundle, (1'l... thread, (2)...
...Water supply nozzle. (3)...Pre-draft zone. +6+, (dr...Pressure roller. (7)...Main draft zone, 00)...False twist nozzle patent applicant Unitika Co., Ltd. agent Patent attorney Shigeki Okumura Figure 1

Claims (1)

[Claims] (1) In a wet spinning method in which a fiber bundle at least partially composed of hemp fibers is wetted and predrafted, then main drafted, false twisted, dried and wound, the predrafted fiber bundle is predrafted. Ifi is a hemp fiber that is characterized by squeezing the liquid at a constant pressure using a pressure roller installed between the draft zone and the main draft zone and then main drad! Junbo method.