CN1049693A - Apparatus for treating fiber cords with liquids - Google Patents

Abstract

For subsequent processing of the freshly spun strand fibers by means of pipe washing, a twin injector is installed for introduction and transport. The advantage of this double injector is that in the first step, the fiber rope is immersed in the flow medium under low pressure conditions, and then, in the second injector, the fiber rope is under higher pressure, Introduce the required amount of fluid and move the flush further. Fiber damage is avoided in this way.

Description

The invention relates to a device for treating fiber rope with a liquid, the device having a washing line and a sprayer, and a method for treating fiber rope using the device.

In order to completely remove impurities from the fibers after spinning, these fibers must be subjected to a post-treatment.

For this purpose, the fibers are sheared and soaked and passed as man-made fiber nonwovens (Stapel faservlies) on screen belts through the different bath wash zones. A safer and more efficient post-processing solution is to guide the infinitely long fiber cord through a closed piping system rinsed with post-processing liquid.

Compared with the traditional post-processing, it is possible to make the monofilament fiber contact with a large amount of washing liquid in a short time, so as to have a good washing effect. However, this significantly high proportion of contact between the washing liquid and the fiber surface cannot be achieved under the conditions of conventional screen belt finishing and grid finishing.

Processes of this type are described, for example, in Swiss patent specification CH-PS273357 and US patent specification US-PS2713784. The special form of implementation of the so-called pipe washing, as described in "Chemical fibers treated by the viscose process" (K. Goetze 3884/855 (1967)), completely abandons mechanical finishing The pipe system flushes the fiber cord. In this case, an injector that introduces the fiber cord into the washing pipe and penetrates and moves the fiber cord with the after-treatment liquid is of great significance.

In order to adapt the fiber bundle to the corresponding method and to ensure production reliability, the injection pressure of the injector must reach 3.0 bar. In the case of delicate fibers, such as fine fibers or those containing modifying addenda such as carbon black, pigments or other inorganic particles, the phenomenon of "hard beam" fiber breakage can result.

At this stage, fiber breakage affects subsequent processing and is extremely detrimental to product quality. For example, in the production of man-made fibers (stapelfaser), the content of long fibers is concerned, fiber breakage leads to unreliable fiber cutting, so that there are undesired long fibers in the man-made fibers cut to a certain length.

The object of the present invention is to overcome these disadvantages and to improve a device of the aforementioned type in such a way that an infinitely long fiber index can be inserted into the washing duct and moved infiltration without causing fiber folds and fiber breaks.

According to the invention, this object is solved in that the injector is a double injector consisting of an upper and a lower injector unit each having a hollow nozzle needle and a nozzle seat.

It is suitable that the inner diameters of the respective nozzle needles and nozzle seats in the upper and lower injector units are almost equal, and that the inner diameter of the lower injector unit is larger than that of the upper injector unit. There is thus enough space in the lower injector unit that the fiber cord is surrounded by a sufficiently thick layer of liquid and thus protected.

The injection pressure of the upper injector unit and the injection pressure of the lower injector unit are preferably independently adjustable.

It is suitable to have an annular chamber above each nozzle opening, where the moving fluids converge.

When the device is in operation, the injection pressure difference between the upper injector unit and the lower injector unit should be 0.5-2 bar, preferably about 1.0 bar; and the ratio of the liquid volume injected by the upper and lower injector units is 1: Between 1 and 1:5, and preferably 1:3, can handle fiber ropes consisting of 6,000-5,000,000 single fibers.

An embodiment of the invention will be further elucidated with the aid of the accompanying drawings. Figure 1 shows a pair of injectors, which according to the invention can be incorporated into a device for treating fiber ropes, Figure 2 shows a variant of it; Figure 3 shows the pressure ratios in the injectors of Figure 1.

The double injector consists of a fixed central part 1 whose upper part is the nozzle seat of the upper injector unit 2 and whose lower part is the nozzle needle of the lower injector unit 3 . A tubular upper part movable by means of a screw is the nozzle needle of the upper injector unit 2 . The nozzle opening 4 can be adjusted by moving the upper part up and down. In order to receive and guide the fiber cord 6, the uppermost end of this part extends in the shape of a funnel. The lower injector unit comprises an identical movable tubular lower part, the uppermost part of which is the nozzle seat.

The stationary central part formed as a nozzle needle simultaneously also forms the nozzle opening 5 of the lower nozzle unit. Before the medium passing through the nozzle openings comes into contact with the fiber strands under pressure, the medium substreams 7 and 8 flowing on the sides of the nozzle openings 4 and 5 flow into the annular chambers 9 and 10 . The annular chambers 9 and 10 are arranged such that no lateral overpressure occurs.

With the aid of the upper injector unit, the fiber bundle with a reduced injection pressure relative to the lower injector unit and with a portion of the total washing liquid is guided very smoothly into the double injector. The fiber bundle is thus surrounded by detergent and conveyed to the lower injector.

The lower injector unit can operate at a higher injection pressure than the upper injector unit, up to 2 bar. Fill it with the rest of the washing liquid volume.

Here, the high injection pressure can no longer reach the individual fibers, since these fibers are already surrounded by the liquid supplied to the first injector unit and thus protected.

Thus, an ideally reliable introduction of the fiber bundles in the individual washing zones can be achieved in a smooth manner.

In a specific embodiment of the double injector, the funnel-shaped section leading the fiber strands into the double injector can have the configuration of additional introduction measures.

Figure 2 depicts an example of this form. 11 is the washing liquid inlet, and the washing liquid passes through the annular chamber 12, and the overflow pipe groove 13 imports the nozzle annular chamber 14, and directly imports and further flushes the fiber rope after the annular gap 15 exits.

When changing the fiber type in the fiber rope, the nozzle cross-section can be changed by moving the nozzle needle in the nozzle holder, thereby optimizing the flow ratio and thus eliminating fiber breakage.

example 1:

An infinitely long HWM (=heigh Wet modulas) fiber composed of 530,000 fibers with a single fineness of 1.7 decitex (dtex) (this fiber is also called Modal-Faser), which has high humidity, that is, in not disconnected in the wet state) is discharged at a speed of 15 meters per minute and is directed into the pipe washing system by means of a double injector.

The upper injector unit has an injection pressure of 0.5 bar and pumps 1,000 liters of acid per hour.

The injection pressure of the lower injector unit is 1.5 bar. The liquid volume is 3,000 liters per hour.

Figure 3 graphically illustrates the flow ratios in the various sections of the dual injector. This is marked next to it.

Arranged at the end of the first washing zone is a squeeze roller, which separates the washing liquid. In the subsequent post-processing wash, the fiber rope is introduced by the second double injector.

Example 2:

An infinitely long fiber rope of graphite impregnated viscose fibers consisting of 312,000 fibers with a single titer of 5.5 dtex is discharged at a speed of 25 meters per minute and introduced into the pipe washing system by means of a double injector .

The injection pressure of the upper injector unit is 0.5 bar. 2,000 liters of acid are pumped in every hour.

The injection pressure of the lower injector unit is 1.5 bar. The liquid volume is 5,000 liters per hour.

Example 3:

A fiber rope of infinitely long cotton-type viscose fibers (ZS fiber product) consisting of 53,000 fibers with a single titer of 1.3 decitex is discharged at a speed of 60 meters per minute and guided into the pipeline washing system by means of a double injector.

The upper injector unit has an injection pressure of 0.7 bar and pumps 500 liters of acid per hour.

The injection pressure of the lower injector unit is 1.5 bar. The liquid volume is 1200 liters per hour.

Example 4:

The rope of infinitely long rope fibers consisting of 10,000 fibers with a single titer of 1.7 dtex was discharged at a speed of 60 meters per minute and was introduced into the pipe washing system by means of a twin injector.

The injection pressure of the upper injector unit is 0.5 bar. 500 liters of acid are pumped in every hour.

The injection pressure of the lower injector unit is 1.0 bar. The liquid volume is 5,000 liters per hour.

Claims (8)

1. A device for treating fiber ropes with a liquid, wherein the device consists of a washing pipe and an injector, characterized in that the injectors are double injectors, each having a hollow nozzle needle and a nozzle seat, The lower injector unit (2, 3) is composed. 2. The device according to claim 1, characterized in that: in the upper and lower injector units (2, 3), the inner diameters of the respective nozzle needles and nozzle seats are almost equal, and the inner diameter of the lower injector unit (2) is greater than Inside diameter of the upper injector unit (3). 3. A device according to claim 1 or 2, characterized in that the injection pressures of the upper and lower injector units (2, 3) are independently adjustable. 4. Apparatus according to one of claims 1 to 3, characterized in that an annular chamber (9, 10) is provided above each nozzle opening (4, 5), into which chamber a partial flow of the flow medium flows. 5. Method for treating fiber ropes using a device according to one of claims 1 to 4. 6. A method according to claim 5, characterized in that the injection pressure difference between the upper and lower injector units is 0.5-2 bar, preferably about 1.0 bar. 7. A method according to claim 5 or 6, characterized in that the ratio of the quantities of liquid injected by the upper and lower injector units is between 1:1 and 1:5, and preferably 1:3. 8. A method as claimed in claims 5 to 7, characterized in that fiber ropes consisting of 6,000-5,000,000 individual fibers are processed.

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