JPS58180654A - Adjustment of widening of filament group - 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 The present invention relates to a method for widening and knotting a group of negatively charged filaments carried with an accompanying air stream, impinging on the path of the air stream and the group of filaments. The present invention relates to a novel method for adjusting the width of a group of filaments by providing a nuclear material and charging the nuclear material.

Conventionally, the technique of charging a group of filaments and opening and widening the filaments by air repulsion between the filaments was developed in the Japanese Patent Publication Publication No. 37.
4993, which serves as a basic technique for obtaining filament nonwoven fabrics, and various applied techniques are also disclosed.

Among these applied techniques, we.

We have focused on the industrial usefulness of a method of dispersing M fibers by colliding a charged filament with an object, and have been studying this method. However, even if the material of the collision plate shown in JP-A No. 56-101938 is used, for example, the collision plate is made of steel or a metal mainly composed of zinc, in the prior art, the llc# possessed by the thread is taken away by the collision plate. be exposed. Another drawback is that when a large number of filaments run on the collision plate, they tend to form a lump or stick together. Furthermore, during long-term operation, the collision plate surface changes due to the collision of the filaments, resulting in problems such as loss of stability.

As a result of intensive research, the inventors of the present invention found that it was possible to widen and adjust the width of a group of pre-charged filaments that are conveyed with an accompanying air flow, by providing a collision object in the path of the air flow and the group of filaments, It has been found that the drawbacks can be overcome by fully charging the colliding object and adjusting the width of the filament group.

With this invention! Colliding object means a planar or curved plate-like body that allows airflow and filaments to pass through but not through, reflecting or sliding, and a net-like body that allows only airflow to pass through, but not allowing filaments to pass through, reflecting or sliding. .

In addition, the widened g-face referred to in the present invention means to change the shape of the deposited web, that is, to substantially widen the width of the filament group, and thus to widen the spacing between the filaments. It also contributes to quality improvement.

The filament group referred to in the present dA may be composed of either organic or inorganic fibers, and the # fibers must be transported with the airflow and charged in advance. The transportation method is not particularly limited, and may be a method using the propulsion force of an air flow, a method using the propulsion force of the fiber itself, or a combination thereof. Any method may be used to charge the object; for example, it may be brought into contact with an object and charged by friction, a conductive liquid is applied and the object is charged dynamically, or the object is moved near a voltage pole to be statically charged. One-shot I is carried out by methods such as charging by electric induction, or running through a coro-discharge area to attract ions and make them magnetized.
For the position vlLy and angle of the collision in jII and the sliding car on the reflector, the impacting object lIc1I and its web width (width of the filament group), e.g. collected on a moving net conveyor It may be arbitrarily determined according to the expected web width at the time. For example, if the accompanying airflow is small, about 15N4Llr or less, the collision object will be placed approximately 10 to 100 points below the charging device 1, and the angle will be approximately 160 degrees below zero (vertical direction). Therefore, the sliding distance of the fibers on the collision object is about 5 to 30 m. If the air flow accompanying P1 is larger than that, the collision object is moved away from the charging device or the sliding distance is increased.

If a reflector is used as the impact object, a hard conductive material such as metal or ceramic should be used. The shape of the reflector may be a flat plate, or may have a curvature or any surface roughness. The shape of the reflector may be freely selected, such as a square shape or a semicircular cedar shape. On the other hand, when a 10#1-shaped proboscis is used as the collision object, a wire mesh or a similar conductive net-like material is used as the -. Regarding the position and angle of the colliding object and the sliding distance on the colliding object, the web width (width of the filament group) after colliding with the colliding object, for example, the expected width when collected by the moving net conveyor 5. Web 11! It may be arbitrarily determined according to the When using an impactor, there is a large air flow accompanying the filament group, for example 15 Nrr? /Hr or more, it is very effective.

The wire diameter and opening of the wire mesh constituting the collision object may be arbitrarily selected depending on the expected width of the filament, as described above. For example, for an accompanying airflow of about 25 to 3 ON values, it is taken around 300 meters.

The method of charging the colliding object in the present invention is a conventional method. That is, this is done by connecting to a DC high voltage power supply. The sign of the power supply voltage at this time may be arbitrarily selected depending on the material constituting the filament group, and the direct pressure is approximately 10 to 39 K/V. The voltage is adjusted depending on the width of the filament group or the running shape m.

Next, a more detailed explanation will be given according to the drawings. a! E
FIG. 1 is a schematic diagram showing one example of a preferred embodiment of the present invention. A group of filaments 2 discharged from a spinneret 1 is blown into the ground by an air sucker 3.

It is ejected and is charged by friction with the frictional charging plate 4.

Next, a DC high voltage power source 6 applies a charged voltage to a reflector 5, which is an example of an object placed in the path of the filament group. Since the filaments are pre-charged, if you do not apply a voltage to one reflector, the potential of the reflector is low and they will be electrostatically attracted to each other. I do things.

On the other hand, due to the repulsive force of the same sign when a voltage is applied, the filaments not only float above the reflector, but also change their width when ejected into the air, and the amount of charge on the filaments increases, causing the voltage to rise. When is made large, the coverage becomes large. The filament group, which has been widened into #1 knots due to the charged voltage of the reflector, is deposited on the net conveyor 7 to form the web 8.

FIG. 2 is also a schematic diagram showing one example of a preferred embodiment of the present invention. The filament group 9 fed at a constant speed by the nip roll IOK is taken up by the air sucker 3, and the ejected filament group is transferred to the needle electrode 12 connected to the DC high voltage power source 6 and the grounded flat target electrode 11. The thread was introduced into the corona discharge unit configured to adsorb and charge ions on the thread, and further: The thread was connected to a high-voltage power source 6', charged with the same sign as the round thread, and run over the nine reflector plate 5. Thereafter, the web 8 is obtained by depositing it on a similarly moving net conveyor 7.

According to the present invention, the width of the filament group can be adjusted arbitrarily by providing a colliding object in the artificial passageway and changing the charging voltage of the colliding object. It can be adjusted in a wide range of directions and has great controllability.

Below, Examples and Comparisons? Ill explain once.

In the row, the load position was measured using a charge count meter (model K Q-431B, manufactured by Kasuga Electric!).

Comparative example 1. Examples 1 to 4 A group of 68 untwisted polyester filaments of 1.5 denier yarn were drawn at a speed of 1,000 m/min at a speed of 1000 m/min using an air sucker.

The current at this time is about 1 o Nyy? /Hr, and the pressure was 07-/mG. A corona release unit is installed below the air soccer, and there are 10 units in a 25-inch pitch! Needle-like electrodes arranged in one example and SUS of 86 garden angles
, lJ target electrodes were arranged between the electrodes b■, and negative direct pressure was applied to the needle.

A 50 x 150 inch steel reflector was placed at a 45 degree angle at the 40 inch position 11 below the corona radiation unit, and a negative voltage was applied to the mirror plate so that the sliding distance of the filament group was approximately 20 -5T8 dL. . Furthermore, the transfer m−r of 5U tM
It was collected on a net conveyor and made into a web. The results are shown in the table.

The amount of charge held by the web in Comparative Example 1 was 3.8μc/
t, 4.7 μc/l in Examples 3 and 4, respectively
and 5.3 μc/f.

That is, it will be understood that the web width can be adjusted by charging the reflector, and the amount of charge is also large.

Example 5 Nylon 6 was made with 46 holes using the method shown in Figure 1.
The filaments were discharged from a spindle having a diameter of 1.5 denier, and an air sucker (pressure 34/dG flow 1i2ON/Hr) was applied to a position approximately 1 m below the spinneret to obtain a group of filaments having a single filament denier of 1.5 denier. Air force - about 10m below ItK,
A chromium-plated friction charging plate (angle 2511, sliding distance 60 points) was set to generate a d11 triboelectric charge.

Furthermore, a 300-mesh SO3 wire mesh cage was placed 10 cm in front of the electric board as an impact object, and the sliding distance was approximately 10 m so that the filament group fell vertically or along it.
Arrange it so that it is K.

A positive high voltage of 15 KV was applied.

The filament group was separated from the accompanying air flow, opened well, and the web width was expanded by about 3 times compared to when no voltage was applied.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of the present invention, and FIG. 2 is a schematic diagram showing another embodiment of the present invention.

Claims (1)

[Claims] 1. When adjusting the width of a group of pre-charged filaments conveyed with an accompanying air flow, a charged collision object is installed in the path of the air flow and the group of filaments. Characteristic method for adjusting the width of filament groups. 2. A method as claimed in claim 1, in which the filaments are fed to an air sucker at a constant velocity of λ, and the filaments are conveyed by the air sucker with an accompanying air stream. 3. The method according to claim 1, wherein the colliding object is a plate-shaped body made of an electrically conductive material. 4. The method according to claim 1, wherein the collision object is made of an electrically conductive material and has the ability to separate a part of the air flow from a filament capable of permeating 0T. & Increase the width of the filament group by changing the charged voltage of the colliding object! 11. The method of claim 1, subsection 11.