JPS602402B2 - Continuous processing method for recycled fiber yarn using viscose method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous-grade yarn post-treatment method for fiber yarns produced by a wet weaving process, particularly for recycled fiber yarns produced by a viscose process.

In the continuous paper yarn scouring process of recycled fiber yarn using the viscose method, the scouring process after spinning requires various chemicals and long processing time, so the longest yarn is bridged in the scouring process section following the paper exit section. I have to accumulate it.

Therefore, it is desired to collect long yarns in a relatively small space and perform the scouring process, and several techniques have been proposed to meet this demand. One of the most typical techniques is the so-called drum-type continuous paper yarn scouring method. In the drum type continuous grade yarn scouring treatment method, for example, an apparatus as shown in FIG. 1 is used. The mulch processing section of this device consists of one large-diameter drum 1 for scouring or scouring and drying, and a plurality of spun yarns arranged in a step-like manner at appropriate intervals above the drum 1. Feed roll 2・
, 22, 23 and 24. The viscose is extruded from the grade outlet 9 into a coagulation grade 10, and then immediately applied to the drum 1 and feed rolls 2, 22, 23 and 24. Drum 1 and feed roll 2, 22,
23 and 24 are rotating at a constant circumferential speed, and threads or thread groups 3, 32, 33 and 3 are threaded thereon.
4, the yarn is wound spirally along the axial direction of the drum 1 and each feed roll from one end to the pond end at small intervals (in Fig. 1, the upstream end of the drum and the The threads that are hung only at the downstream end are shown in the figure, and the threads that are hung at the middle part are not shown.)
. When the individual threads or thread groups 3, 32, 33 and 34 move along the direction of the drum 1 and each feed roll, the passage of each thread or thread group is, for example, a comb-like thread. It is regulated by article guide 7. In order to facilitate yarn feeding, the axes of each feed roll and the drum 1 are preferably not parallel but intersect with each other. Thus, the circumferential surface of the drum 1 is divided into a plurality of zones by flanges or partition plates 6 perpendicular to its axis (only two zones at the upstream end of the drum and one zone at the downstream end are shown in FIG. 1; (Other areas are omitted from illustration.) In each area, various chemicals are poured into the yarn from the chemical liquid supply pipe 5 and scouring treatment is performed, and preferably the area near the end of the drum is used as a heating zone. The yarn is dried and finally wound into a winding tube into a desired burn, cone or cheese shape. Here, the plurality of areas where the yarn is processed include, for example, a two-bath coagulation area,
Refers to multiple neutralization areas, bleaching areas, multiple washing areas, etc. In the method of performing continuous spinning scouring of viscose recycled fiber yarn using the drum-type device described above, a series of feed roll groups 2, .
Sodium sulfate is the main component on both sides adjacent to the yarn passage in the initial area where the yarn starts to be applied at 22, 23 and 24, the upstream area la of the drum 1, and the corresponding portion of the yarn guide 7. Crystals are precipitated and deposited.

The deposited crystals fall off due to the rotation or vibration of each device member, and the fallen crystal pieces intervene in the running thread group and are held by the threads. As a result, frictional contact with the yarn causes fluffing of the yarn, sometimes leading to yarn breakage. In operation of the apparatus in which multiple yarns are processed in a single drum, cutting one yarn causes cutting of multiple yarns. Therefore, the operation of the continuous paper yarn must be interrupted from time to time to remove the deposited crystals. Interrupting continuous operation in this manner not only causes a decrease in productivity, but is also unacceptable for a continuous filament yarn production mode where it is absolutely necessary to avoid cutting. An object of the present invention is to prevent the above-mentioned adhesion and accumulation of crystals in the lotus-spinning scouring treatment of regenerated fiber yarn by the viscose method, and to avoid the generation of fuzz and yarn breakage caused by this.

In the continuous processing method of viscose recycled fiber yarn according to the present invention, the thread is threaded between a drum for scouring or scouring and drying and a feed roll arranged in parallel above the drum. In a method of performing scouring or scouring-drying while the drum and feed roll are being wound in the rolling direction, water vapor or a water-vapor-containing gas is supplied from the lower part of at least the upstream part of the drum, and the following steps are carried out. The method is characterized in that water vapor is diffused onto the yarn winding surfaces of the drum and the feed roll. The method of the present invention will be explained below with reference to the accompanying drawings.

2, 3 and 4 show a specific example of the apparatus used to carry out the method of the invention. FIG. 2 is a partially cutaway perspective view of the chemical liquid recovery tank 4 in which grain is distributed below the drum so as to cover the lower part of the drum 1. This chemical recovery tank 4 also serves as the lower part of a drum-type continuous paper; a casing (not shown in FIG. 1) that covers the entire yarn processing device.
A main pipe 13 for supplying water vapor or water vapor-containing gas is arranged below the tank 4, and a pipe 12 is connected to the main pipe 13 for supplying water vapor or water vapor-containing gas.
protrudes from the bottom of the tank and forms a means for water vapor or water vapor-containing gas flow.
4 is a side sectional view of the lower part of the drum-type device equipped with the chemical liquid recovery tank 4 shown in the figure, and FIG. 4 is a front sectional view of the lower part of the drum-type device.

In FIG. 3, various scouring chemicals supplied from the chemical supply pipe 5 onto the circumferential surface of the drum flow down on the drum circumferential surface and are collected in the chemical recovery tank 4 as a recovered chemical 11. Water vapor or water vapor-containing gas is supplied to the space within the chemical liquid recovery tank 4 from the main pipe 11 through each pipe 12 protruding from the bottom of the chemical liquid recovery tank 4 . The supplied water vapor fills the space inside the tank 4, and is affected by the air entrainment flow caused by the rotation of the drum, and is applied to the entire circumferential surface of the drum, the guide 7 (Fig. 2), and the feed roll 2 ( (Fig. 2).In other words, the drum part of the drum-type continuous spinning and scouring equipment is capable of dispersing the carbon disulfide generated during the process from the drum part.
In order to protect workers and supervisors from harmful substances such as hydrogen sulfide, the entire drum section is usually housed in a casing (not shown), so water vapor that fills the space in the chemical recovery tank 4 is easily removed. In FIG. 4, a partition plate 14 (in FIG. (not shown) is provided.

In the example shown in FIG. 4, a steam discharge pipe 12 protrudes from the main pipe 13 for each treatment area. The gas released from the main pipe 13 through the pipe 12 into the space within the processing chemical recovery tank 4 has water vapor as its basic component, and the most typical gas is live steam.

It may be a mixed gas of excess steam, heated sitting air, and water vapor. As mentioned above, the deposition of crystals on the peripheral surfaces of the feed roll and drum as well as on the yarn guide occurs conspicuously at the upstream end of these equipment members, and is only slight at the downstream end, so it is difficult to recover the chemical solution. Although it is essential to provide a water vapor supply means, such as a water vapor discharge pipe, at least in the upstream part of the tank, it is not essential to provide the means in the downstream part.

In addition, the pipe 1 is arranged so that the amount of water vapor released increases as the
It is desirable to take measures such as adjusting the diameter of 2. The method of the present invention is particularly useful when using yarns with a relatively high sulfate concentration, when treating large denier yarns, and when treating a large number of yarns (usually 4 or more) at the same time. effective. This is because the disadvantages due to the work of removing deposited crystals and the interruption of operation are particularly noticeable in these cases. A very interesting aspect of the method of the invention is that the steam or steam-containing gas is supplied from a position below the scouring drum.
According to this method, the purpose of preventing crystal deposition can be achieved with an extremely small amount of water vapor released. In contrast, even if a large amount of water vapor is released directly into the processing space in the casing that encloses the drum and feed roll, most of it will be suctioned away from the harmful gas suction duct, and the crystal deposition prevention effect will be negligible. It was found that it did not contribute. A specific example will be explained in order to make the present invention easier to understand.

Using the known apparatus shown in FIG. 1, the amount of cellulose was 8.
1% by weight, total alkali content5. Paper yarn was made from $wt% viscose.

The sulfuric acid concentration of the two-bath coagulation liquid in the spinning bath and the first zone on the drum (two-bath coagulation liquid treatment zone) was 125 t/s, and the sodium sulfate concentration was 260 t/s. The suture removal speed was 115 m/min. In this way, the yarn of 120 denier and 26 filaments was continuously made into paper yarn for one month. The yarn treated in the scouring and drying treatment area shown in FIG. 1 was continuously wound into a barn shape using a lacquer yarn machine. The amount of winding per burn was 2 kg.

At the beginning of operation, the full-purn yield was 1%, but after one month of continuous operation, there was a lot of crystal adhesion, especially on the yarn feed roll, and as a result, the full-purn yield decreased to 76%. On the other hand, the number of fuzz per 100 threads per skin was 8 at the beginning of operation, but was 17 after continuous operation. From these results, it is clear that the decrease in spinnability and yarn quality is significant, so it is necessary to stop the operation of the apparatus and remove the crystal deposits. Continuous paper yarn treatment was carried out under the same conditions as described above using an apparatus in which a steam supply means as shown in FIG. 2 was disposed below the chemical recovery tank of the apparatus shown in FIG.

0.3 of superheated steam of 105oC is supplied from the steam supply means.
It was released at a flow rate of k9/Hr. Even after continuous rotation for one month, the crystal adhesion was extremely slight, the spinning full-pern yield was 95% or more, and the number of fluffs per million skins was 8 times.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an apparatus used to carry out the conventional viscose leash continuous grade yarn scouring treatment method, and Fig. 2 shows an example of the chemical liquid recovery tank and steam coupling means of the apparatus used to carry out the method of the present invention. The perspective view, FIG. 3, and FIG. 4 are a side sectional view and a front sectional view, respectively, for explaining one embodiment of the method of the present invention. Reference numbers in each figure are as follows. 1...
Drum for scouring or scouring and drying, 2,, 22, 23, 2
4... Yarn feed roll, 3, 31, 32, 33, 34.
... Thread, 4 ... Chemical solution collection tank, 5.
..... Chemical solution supply groove tube, 6.. Flange or partition plate, 7.. Thread guide, 9.. Grade thread cap, 1
0...Spinning bath, 11...Recovered chemical solution, 12...
...Steam discharge pipe, 13...Steam main piping, 14...Partition. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A spun yarn is placed between a scouring or scouring/drying drum and a feed roll arranged above the drum and the yarn is oriented along the axial direction of the drum and the feed roll. In a continuous processing method for viscose recycled fiber yarn, in which scouring or scouring-drying is carried out while the drum is being rolled up, the yarn is processed while supplying water vapor or a water vapor-containing gas from a position below at least the upstream portion of the drum. A method characterized by: 2. The method according to claim 1, wherein water vapor or a water vapor-containing gas is supplied to the space of a processing chemical recovery tank that covers the lower part of the drum.