JPS59211646A - Opening of metal fiber yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a method for favorably opening metal fiber threads using a gas flow.

<Prior art and its problems> Conventionally, many methods have been proposed for opening fiber threads using organic polymer substances. For example, there is a method of colliding a group of filaments with a collision plate using high-speed compressed fluid and opening them with an auxiliary jet stream ejected from behind the colliding position, and a method in which fiber #((i) is charged and electrically repelled. Although there are methods such as opening and binding, metal fibers are significantly different from organic polymer fibers in terms of specific gravity and conductivity.

The former method has the disadvantage that it is difficult to move and the fibers become entangled due to collisions, and it is impossible to open the fibers using the latter method. Such defects occur particularly in the case of soft fibers with high specific gravity such as lead fibers.

There is also a method of manufacturing a sheave by applying a fluid to a large metal flux from the side, but such a method has the following drawbacks.

■ Since it is carried out in an open system, it is easily affected by disturbances and the opening is unstable.

■ If the falling speed of the fibers is fast, the fiber bundle as a whole only moves in one direction, and it is not possible to open the fibers by increasing the distance between the single fibers.

■ If the fluid speed is increased, the airflow becomes more turbulent and opening becomes unstable.

<Objective of the Invention> The object of the present invention is to satisfactorily open a melt-spun metal fiber thread to produce a uniform nonwoven fabric with less unevenness.

<Structure of the Invention> A step of guiding a metal fiber into a cylinder and actively supplying a gas flow into the cylinder, followed by a step of sucking the gas flow from the inside of the cylinder in a direction symmetrical to the fiber threads. A method for opening a metal fiber yarn consisting of.

<Mechanism of action of the invention> The metal fibers of the invention refer to long fibers and short fibers obtained by methods such as melt spinning and cutting. It is particularly effective for long fibrous materials.

Materials constituting the metal fibers include those that can be spun, such as lead, aluminum, zinc, tin, iron, and copper, as well as alloys of these metals or with other metals.

Next, the fiber opening method of the present invention will be explained with reference to the drawings.

In FIG. 1, the metal wire &,i[
The thread 1 is guided into the cylinder, and a gas flow is actively supplied by the device 2. An air flow is ejected downward from the upper circumference of the device 2, and a mixed flow of the gas flow and metal fibers is formed. A suction device filter is continuously installed in the device 2, which suctions a gas flow in a direction symmetrical to the fiber threads. Here, the symmetrical direction means two directions of 1800 opposite directions on a disk centered on the metal fiber thread and perpendicular to the flow direction of the thread.

A symmetrical airflow is generated from the outlet of the device 2 toward the suction surface of the suction device B. Accompanied by this flow, single fiber movement of the metal fiber yarn occurs, that is, the single fibers closer to the suction surface move more widely and are thus opened as a whole.

Due to the opening mechanism, it is a necessary condition that the gas flow is sucked in a symmetrical direction along with the metal fibers.2 The present invention is effective only when both the device 2 and the device filter work together. If you take only one of them, you will not get the effect.

Furthermore, in order to bring out the effects, it is necessary to appropriately select the wind speed at the outlet of the device 2 and especially the suction wind speed at the suction surface of the device 6. The suction wind speed is changed depending on the falling speed and fineness of the fibers, and adjusted to ensure stable opening without causing turbulence in the airflow. for example.

When the fiber diameter is 30~40μ, the falling speed is about 7~3m,
/sea, it is desirable to select the suction wind speed to be about 4 to 6 m/sec.

The cylindrical shape is completely symmetrical with respect to the center, but it is particularly preferable because it is easy to design the device and it is also possible to suction isotropically.

The design of the hole diameter of the perforated plate of the suction device B is such that there is no variation in the suction wind speed depending on the position, and there is no particular problem as long as the desired wind speed is obtained.
I like 5-5 dishes.

It is more effective to install the apparatus of the present invention at a position where the solidified fibers do not become entangled with each other due to air resistance during free fall, and preferably at a position 30 to 100 holes below the nozzle.

The present invention has the advantage of being less susceptible to external disturbances since the fiber opening is carried out in a series of cylinders. Furthermore, since the opening method is not based on collision with a veneer, it can be applied to flexible metal fibers such as lead fibers.

It has the characteristic that the fibers ifF do not fold or twist or get entangled, and can be opened well.

<Effects of the invention> A metal fiber nonwoven fabric with extremely low unevenness can be obtained.The nonwoven fabric obtained by the present invention has a large number of overlaps during the formation of the nonwoven fabric by opening the fiber bundles, resulting in extremely high density and uniformity. Forms an excellent sheet.

<Example> Electrolytic lead was melted at 40°C with N from a nozzle with 300 holes.
2. Spun into the atmosphere under pressurized gas using the apparatus 2. shown in FIG. It led me to device B. The falling speed of the thread at this time was about 8 m/sec. Compressed air was supplied to the device 2 at a rate of about 2001/min,
The wind speed at the center of the suction surface of device B is approximately 6 m/e'
The lead fiber yarn was opened well by isotropically suctioning from the entire surface so as to achieve eC.

The diameter of the fiber bundle at the nozzle lower part 30an and the entrance of device 2 was approximately 6 Cfn, but after passing through the device filter.

Nozzle bottom 2. ．． At 5m, it expands to about 20an in diameter, which is 9.

Next, this fiber bundle was introduced into a nonwoven fabric forming apparatus, and a nonwoven fabric with an areal density of 5 kg/m2 was produced in order to clearly observe the state of unevenness. The state of unevenness was observed using a light transmission method on a nonwoven fabric having a width of 60 cxn and a length of 10 Dan.

Figure 2 shows the observation results. The thin areas through which light passes are indicated by diagonal lines.

FIG. 6 shows similar observation results as a comparative example when the lead fiber yarn is not opened.

It can be seen that in the example, the area of the thin portion is small and the number is very small, and the uniformity of the nonwoven fabric is greatly improved.

[Brief explanation of drawings]

FIG. 1 shows an example of a fiber opening mechanism used in the method of the present invention, and FIG. 2 is a transparent view of a nonwoven fabric obtained by the method of the present invention.
FIG. 6 is a transparent diagram of a nonwoven fabric of a comparative example. 1: Spun yarn 2: Gas flow supply device; Suction device 4; Yarn guide duct 5; Transparent section - Applicant Azuma Co., Ltd.

Claims (1)

[Claims] A metal fiber yarn comprising the steps of guiding a metal fiber into a cylinder and actively supplying a gas flow into the cylinder, and subsequently sucking the gas flow from the cylinder in a direction symmetrical to the fiber yarn. How to open the strips.