JPS587725B2 - Visco rayon yarn drying equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for drying wet viscose rayon yarn in thread form.

For example, as shown in Fig. 1, a continuous yarn 1 immediately after spinning is
The chemical liquid is applied from the chemical injection pipe 5 to the drum circumferential surface while passing it in a spiral pattern between the drums 2 and 3 for scouring and drying and the yarn feeding roll 4, which are placed approximately in the Y row, in a spiral manner. There is a continuous spinning machine for viscose rayon yarn that pours, scouring, and then dries on the circumference of a drum that is kept at an appropriate temperature.With this machine, it is easier to obtain a paan product that is more homogeneous than a cake. Although these drying drums have advantages, they are generally right cylindrical or have a slight taper angle throughout the drying section so that the surface diameter becomes gradually narrower, but both have drawbacks.

That is, in the former case, the resulting yarn has a high boiling water shrinkage rate.

The boiling water shrinkage rate is the yarn length L when a yarn with a moisture content of 11.0% and a yarn length L0 (m) is immersed in boiling water for 1 hour without tension and then dried to the same moisture content as before treatment. (mm) is expressed as L0-L/L0×100 (%). For example, if a yarn with a high shrinkage rate in boiling water is used as a yarn for textiles, the resulting fabric will shrink in the length direction and/or width direction. However, it is avoided in the industry because it is extremely difficult to obtain fabrics with the specified dimensions.Compared to the boiling water shrinkage rate of the cake obtained by the normal centr spinning method, which is 2 to 3%, the above-mentioned true cylindrical spinning method In the case of a drum like this, the yarn obtained had a shrinkage rate of more than 6%, and the desire was to obtain a yarn with boiling water shrinkage at least comparable to that of cake.

On the other hand, with a tapered drum, the boiling water shrinkage rate of the yarn obtained is less than that of cake yarn, but during the drying process, the initial and final stages are the same as the scouring drum. In the continuing portion and near the end, the running condition of the thread becomes unstable, causing it to wobble in the left and right directions with respect to the running direction, causing adjacent threads to touch and become entangled, resulting in more occurrences of fuzz and thread breakage.

The object of the present invention is to provide a drum structure which eliminates the above-mentioned drawbacks and which can obtain a yarn with a high yield of less than 3% of the cake yarn obtained by the pot spinning method with a boiling water shrinkage rate. It is characterized in that the entrance side of the thread is shaped into a right cylindrical shape, followed by a tapered shape with its diameter gradually becoming thinner, and then further shaped into a right cylindrical shape.

A side view of an example of the drum of the present invention is shown in FIG. 2, where 31 is a right cylindrical portion, 32 is a tapered portion, and 33 is again a right cylindrical portion.

In addition, in FIG. 3, the thread progresses from left to right.

The length and taper angle of each part are selected appropriately based on the drying speed, shrinkage rate, etc. of the yarn, but the part where the moisture content of the yarn is 300% or more and the part where the moisture content is less than 20% are considered to be right cylindrical. It is preferable to do so.

Here, the shapes of the drum and roll should correspond to each other, that is, if the drum is a right cylinder, the corresponding roll should also be a right cylinder, and if the drum is tapered, the roll should also be tapered. It is necessary to make the rate of change in diameter, not the taper angle, the same, and it is well known that if this is lacking, the running yarn will become slack, which is undesirable.

The joints between the front right cylindrical portion 31 and the tapered portion 32, and between the tapered portion 32 and the rear right cylindrical portion 33 may be smooth without seams.

According to the drying drum of the present invention, the resulting yarn has a boiling water shrinkage rate of 3% or less, which is comparable to that of a cake, and the above-mentioned wandering of the running yarn is not observed at all.

Here, the reason why the boiling water shrinkage rate of the yarn obtained is low is thought to be because the drum is tapered in the area where the yarn shrinks over time due to drying, which reduces residual strain. It is thought that because the portion where a slight amount of turbulence occurs is shaped into a right cylinder, the running yarn does not walnut and the running condition of the yarn is good.

According to this apparatus, a paan product with a low shrinkage rate in boiling water can be directly obtained, so it has good operability and is of great industrial value.

Example In the continuous spinning device for viscose rayon yarn shown in Fig. 1, yarn of 120 denier/40 filaments was spun at
The fibers were spun at 20 m/min and processed using a scouring and drying drum with a drum diameter of 1 mψ.

The total length of the drying portion of this drum was 200 mm, of which the first straight portion was 30 mm long, the portion where the ridge drum diameter gradually decreased was 70 mm long, and the final straight portion was 100 mm long.

In this drum, the drum diameter reduction rate was 4%, but the boiling water shrinkage rate of the yarn thus obtained was 2.5%.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a drum-type continuous viscose rayon spinning apparatus provided with a drying drum according to the present invention, and FIG. 2 is a side view of the drum of the present invention.

Claims (1)

[Claims] 1 A viscose rayon yarn is made of viscose rayon yarn, which is passed in small intervals between a drying drum and a yarn feeding roll placed approximately in the Y row, and is made to travel in a spiral while drying on the drum circumferential surface. A drying device for viscose rayon yarn, characterized in that the drum has a right cylindrical shape on the yarn entry side, then a tapered shape by gradually narrowing the diameter, and then a right cylindrical shape. .