JPS58180655A - Dispersing and piling 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 dispersively depositing filaments for producing wide uniform nonwoven webs.

A method for producing a uniform nonwoven web by distributing and depositing filaments on a moving net conveyor in which filaments are fed to a plurality of air suckers at a constant speed is disclosed in 411 Publication No. 42-
No. 23998.

However, with this method, it is difficult to obtain a uniform nonwoven web if the widths of the web rows for each air sucker, which are ejected from the air suckers and deposited in a dispersed manner, are not uniform. This is because the width of the web row for each air sucker differs slightly due to changes in the precision of the work of the air sucker or other devices, or changes in the amount of charge held by the filament.

However, this method also has the disadvantage that it is difficult to change the manufacturing conditions while using the same equipment.
For example, change the number of filaments per air soccer. Alternatively, in the case of changing the single yarn denier of the filaments, unless a method such as changing the interval between air suckers is used, the overlap of the webs Q made up of each filament group will change. In extreme cases,
It has drawbacks such as so-called streaks and cannot be used as a product (
There are 7.

Therefore, the present invention has made it possible to adjust the width of each web row in response to large changes in the nonwoven web width and subtle changes in the width of each web row consisting of each filament group. As a result of repeated studies, the present invention has been completed.

That is, the present invention provides a method for manufacturing a uniform nonwoven web by distributing and depositing filament groups supplied to a plurality of air suckers at a constant speed and guided into a corona discharge electric field on a conveying net conveyor. Then, a reflecting plate is installed individually for the filament group charged by corona discharge, and the traveling filament of each reflecting plate is
This is a method for dispersing and depositing filament groups, which is characterized in that the width of each filament group is uniformly widened by adjusting the angle with respect to the filament group, and web rows from each filament group are deposited on a net conveyor to the extent that they do not interfere with each other.

The "uniform unmarried web" referred to in 8 of the present invention has a basis weight of 1
It means that a sample of 1 to 5 x 100 aI is taken in the width direction of the nonwoven web at 5 to 50 t/d, and the variation in the basis weight of the sample is within 15% of the set basis weight.

In the present invention, "a group of filaments that are supplied to a plurality of air suckers at a constant speed" refers to organic fibers such as polyester, polyester, and polymer fin, or inorganic fibers such as glass that act as a filament group. It means to supply and take over the air sucker at speed. That is, the fibers may be spun and continuously supplied to the air sucker, or the fibers may be rolled up in advance and supplied to the air sucker.

Hereinafter, the present invention will be explained in detail with reference to the drawings. spear 1
The figure is a schematic overall view showing an example of a preferred embodiment of the present invention. A filament group 1 sent out at a constant speed by a roll group not shown in the drawings is taken up by an air sucker 2 and guided to a corona power transmission unit 3. The filament group charged by K is
The web is widened by a reflector 5 located below the unit, and the individual filaments repel each other to form one web row 6 on a moving net conveyor 7. One web row 8 and one web row 6 formed by the air sucker 2 and the adjacent air soccer
When they are made to widen and fall from each other by the reflector 5,
By being preset in a position where there is no air interference, there will be no deterioration in quality or disturbance in the rows due to turbulence in the airflow. The webs are then sequentially stacked to form an overall uniform web.

FIG. 2 is a partial cross-sectional view showing an example of a preferred embodiment of the air carrier, corona discharge unit 8, and reflector in the KM of the present invention. In the figure, the air sucker 2 shown by the two-dot chain line is supported by a bushing 9, and the bushing 9 is rotatable at t1. A plate 11 is supported by an arm 10 that is fitted with the arm 10, and a plate 11 with a plate 15 that supports the corona discharge unit 3 and the reflector plate 5 attached thereto is screwed to the bush 9 under the arm. 13 and spacer 12
It is movably supported at the pole (port) 14 via the pole.

That is, by loosening the bushing 9, it is also possible to change the angle of the corona discharge unit 3 and the reflection plate 5 with respect to the traveling direction of the net conveyor.

Below the air sucker 2, a corona discharge unit 3 is attached to a support plate 15 with bolts 19. A grounded flat target electrode 21 and a needle electrode 4 are incorporated into the structure. The needle electrode 4 is connected to a DC high voltage power source (not shown) via a cable, and a high voltage is applied thereto.

FIG. 3 is a view of the corona discharge unit 8 and the reflector plate viewed from the front. A reflector plate 5 is provided under the corona discharge unit 3.
The arm 16 is fixed to the support plate 15 with a bolt 18, and is attached to the arm 16 via a bolt 20 via a bolt 20 so that its angle can be changed.

The air sucker 2 used in the present invention may have a round or square ejection port for the filament group, and is particularly limited as long as it can pull the filament stably and does not give the filament K twist. It is not something that will be done.

The corona discharge unit 3 is the lower blade of the air sucker 2.
ioma is installed at a location, and the relative position is determined so that the filament group after exiting the air sucker passes through the part where the needle electrode is installed. For example, it is a preferable embodiment for the filament group to run in the vicinity of a needle-shaped electrode having a plurality of needles in one to multiple rows vertically or horizontally so as not to be caught by the electrode needles. A group of filaments supplied to the air sucker at a constant speed are pulled by the air sucker, guided into a corona discharge unit, and held with an electric charge. The angle of the reflector (around K where the airflow containing the filament group is reflected by the reflector placed under the unit, widened and emitted the filament group into the air),
(indicated as - in the figure) may be arbitrarily set within 60 degrees depending on the required web width, and in most cases, preferably 20 to 6
It is taken at 0 degrees. If the angle is 60 degrees or more, the filament group will not be sufficiently separated, resulting in poor quality.

This reflector plate is located at 20 to 1001 below the corona discharge unit.
The material is not limited, and metal, ceramic, or any other material may be used. Further, the size thereof may be arbitrarily determined by taking into consideration the distance over which the filament slides along the reflecting plate 8 and the amount of accompanying airflow. Usually, the distance that the filament slides along the reflective plate should be set to 5 to 30 mK, and there are no particular limitations other than this. In addition, the filament of the reflector may be a curved surface such as a convex or concave surface (it may also be a flat surface, but in the present invention Kj+5, a flat surface with a smooth surface is called the control for widening the filament). From this point of view, it is suitable.

In this way, the filaments, which are charged by corona discharge and have the property of opening due to mutual electrical repulsion, are divided into one group depending on the angle of the reflecting plate or the sliding distance depending on the fixed distance until they are deposited. The spread width of the filament group is adjusted, thus creating an adjustable width nib row deposited on a moving net conveyor from an air sucker.

Ten thousand, it is necessary to laminate the web rows deposited by 1% air sucker to form an overall uniform nonwoven web. Since the web row deposited by each air sucker extends the width of the gong web row only by the reflector, the air flow containing the filament group released into the air from each air sucker hits the reflector and is reciprocal. do not interfere with That is, it is aS that the interference does not change the Kuepta sac. Each air sucker is preferably separated by more than 10 countries as a solid center. The stacked web rows are created by arranging multiple rows of air suckers diagonally. FIG. 4 is a schematic diagram of a stacked state. Figure 4 (Φ) shows a cross-sectional view of a stacked web row.

Since the web row deposited by the reflector 5 as shown in the present invention exhibits a trapezoidal basis weight distribution as shown in Figure yP4) a, 8 & c, the lamination ratio is generally set at 20-80. A web row for each air sucker, preferably taken from 30 to 701&c, is required under the moving net conveyor! Due to the auxiliary action of suction ducts installed according to the conditions, the layers are stacked without blow-off.

As described above, according to the present invention, it is possible to obtain a uniform wide nonwoven web by adjusting the spreading width of each filament group very easily. Since it is possible to adjust the spreading width of each filament group, it is also possible to regulate the arrangement of filaments in the web row by changing the angle of the reflector with respect to the traveling direction of the net conveyor. That is, the attachment shown in spear 2- is the mechanism 9, 10 . II
From K, corona discharge unit) N and reflector, Figure 1
As shown in , the VCC net compare is tilted at an angle of 9 to the Ichikawa force plane with respect to the traveling direction. In other words, although the web radius is reduced by CU3 (?-90), the web row width can be kept constant by changing the reflector angle θ accordingly.
Figure i-5 (+) which shows the same deposition distribution as Figure 4(b))
is obtained, and a nonwoven web with uniform basis weight is obtained. Of course, some of the many air soccer reflectors installed,
Even if the angle ψ is different from that of other reflectors, the web row width can be easily kept constant, and any fiber arrangement can pass through a nonwoven web of uniform basis weight.

By the method of the present invention, a wide nonwoven web with a very uniform basis weight can be produced very easily. By using the present invention, by combining a device that measures the density unevenness online, a feedback device that changes the K and reflector angle, etc., it becomes possible to automatically control the density unevenness of a non-woven web, which has been difficult in the past. It's really useful.

The following is an explanation using examples.

Example 1 Polypropylene (35056, Nisso-backed) was discharged from 04 spindles with 0.4 corner adjustment φ and 124 nozzles, threaded onto one Nelson-type take-up roll, and taken-off speed r! The film was taken up at a speed of t1000 m/min, and further stretched twice at a speed of 2000 mm/min using one stretching roll. The single filament denier of the obtained filament was 2 denier. 4 air suckers for 1 stretching roll
Each spear was prepared and arranged as shown in Figure 4 (a).

Adjacent air soccer position G"! 1 year old 4 As shown in Figure (a), address 4 diagonally, the interval is X"'100#1ml,
It was set so that Y=1001111IIC.

Air soccer is the archetype air soccer, and the jet nozzle is 611.
The flow rate was 9 Nd/Hr. The pressure is O1'
The specimen was collected under the conditions shown at 8 ke/mG Y.

A corona discharge unit is installed at a position 5a+m below the air sucker, and the relative position of the air sucker and the unit is such that it runs near the needle electrode.

The corona discharge unit is composed of needle-like needles arranged in a row of 10 horizontally at a pitch of 3 meters, and plate-shaped target electrodes installed vertically at a distance of 2υ1. . The main body of the corona discharge unit is made of an insulating material, and the electrode needle is also 2+ so that 141 parts of the needle tip are exposed.
The electrode surface is made up of a needle cover with a width of slit or a hole, and the filament group is made to run by cutting it into a round shape.

The target electrode is grounded, and a negative voltage is applied to the needle electrode by connecting it to a DC high voltage power source. In this case the voltage was approximately 35 KV.

The reflector was placed below the corona discharge unit in the manner shown in Figure 3), with a distance of 40xMK from the point where the center of the air sucker collides with the reflector to the lower layer of the air sucker, and an angle of 1. . The surface is 5IJS (skinned), and the sliding distance of the filament group is 25wswrK.
It was installed so that The angle 0 of the reflector is approximately 251!
It was installed in L.

Movement - (6 The speed of the net conveyor is 30 sa/+ni
1, the widthwise basis weight distribution of lX100511 of the web row deposited by Lyc from one air sucker on the net conveyor was trapezoidal as shown in Figure 6.

The air flow containing the filament groups discharged into the air from adjacent air suckers did not interfere with each other, and the web rows of each air soccer were sequentially stacked on the moving net conveyor with the assistance of the suction duct.

The wrinkled nonwoven web had a width of about 50 scratches, and was also hot pressed using a partial hot press roll (emboss strength: 14311 degrees, flat: 141 degrees). The variation in the fabric weight of the obtained nonwoven fabric is as follows, taking the fabric weight distribution of 3×1003 in the direction of the lateral force of the nonwoven fabric.
Setting 24 f/wl K, except for the ears of about 10aR on both ends.
It was 21 inches when I turned it on.

When we carefully examined the nonwoven web, we found that the fabric weight of the fourth air sucker was 24 t/m as shown in the off-line diagram (a).
- It turned out to be bigger. When the angle of the reflector of this fourth air soccer was changed to 31 degrees, the spear 7 figure Φ
) The area weight distribution was as follows. Then, when the fabric weight distribution of 3 x 100 m is taken in the direction of lateral force of the nonwoven fabric, the fabric weight variation is 24
? /w? The following table shows the results of changing only the angle of the reflector after the basis weight fluctuation was adjusted to within 15 degrees.

Comparative Example 3.4 In Example IKjj, the results of changing the values of X and y in FIG. 4 (Jl) K% are as shown in the following table.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of the present invention, FIG. 2 is a diagram of the same part 119TthI, and FIG. 3 is a front view of the lower part of Figure 2,
Crane Figure 4 (a) is a schematic diagram showing the stacked state of sea urchin pigs deposited from the reflector onto the net conveyor, Figure 4 Φ) is a cross-sectional view of the stacked web rows, and Figure 5 (aJ (b) ) are schematic diagrams and cross-sectional views showing another embodiment of FIGS. 4(a) and (b), and FIG. 6 is the fabric weight distribution in the width direction of the I XI 00 country of the web deposited by the implementation. The graph %jg7 shows the web rC deposited in Example 8.
Accordingly, when changing the angle of the reflector of the air soccer
This is a graph showing the basis weight distribution in the width direction of X100o11. l...Filament group 2...Air sucker 3...Corona discharge unit 4...
・Electrode 5...Reflector plate 6...Web row 7...Net conveyor 8...-Web row 9...Button 1O... ... Arm 11 ... Mounting plate 12 ... Spacer 13 ... Angle 14 ... Pol) 15 ... Support plate 16 ... ... Arm 17 ... Mounting is on board 18, 19. 20 ...
... Bolt 21 ... Flat & shaped target electrode
22...Corona discharge unit body 23...
... Electrode support member 331 Fig. 2 Fig. 4 (a) (b)

Claims (1)

[Claims] 1. A uniform nonwoven web is produced by dispersing and depositing filaments supplied to a plurality of air suckers at a constant speed and guided into a corona discharge electric field on a conveying net conveyor. 8 in method. A reflecting plate is individually installed for each filament group charged by corona discharge, and the angle 0 of each reflecting plate with respect to the traveling filament is adjusted. A distributed deposition method for a group of filaments in which rows are deposited at positions on a net conveyor where they do not interfere with each other; 2. The angle of the reflector with respect to the chemotactic filament K is within 60 degrees. -The method described in Section 1. 3. @The method according to claim 1, where the position of the contacting air soccer is small (both are 101 or more apart)