JPS62177271A - Apparatus for producing nonwoven fabric - 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 (Industrial Application Field) The present invention relates to an improvement for eliminating non-uniformity such as ridges in a web in an apparatus for producing a nonwoven fabric web from a group of spun filaments.

(Prior art and its problems) Direct spinning (D 1rect fabrication)
) by non-woven fabrics! ! As a device for making one filament, 1 q filament is pulled from a spinneret by a pulling device (hereinafter referred to as an ejector) using a compressed air flow, and after being ejected and opened through a tubular body along with the compressed air flow, the filament is collected on a conveyor etc. Many devices are used to do this. A large number of ejectors used in such a device are usually arranged along the width direction of the nonwoven fabric (a direction perpendicular to the direction in which the conveyor travels).

However, when performing such an arrangement, if the spacing between the filament outlets of the air body is made small, the effects of so-called insertion interference, such as airflow interference from adjacent tubular bodies and electrostatic repulsion between filaments, may occur. This causes unevenness such as ridges in the resulting web. There is a problem in that the quality of the product deteriorates. To solve this problem, it is possible to widen the spacing between the filament spouts, but if you widen the spacing easily, you will not be able to obtain a suitable overlap between the filament spout ranges from adjacent filament spouts. First, the continuity of the web in the width direction is lost, which also impairs the uniformity of the product.

(Objective of the Invention) The present invention is intended to overcome the above-mentioned problems, and its purpose is to provide an apparatus capable of producing high-quality nonwoven fabric without imparting nonuniformity such as ridges to the web in nonwoven fabric production. do.

(Means for Achieving the Object) In order to achieve the above-mentioned object, in the device according to the present invention, a plurality of tubular bodies are arranged along the width direction of the nonwoven fabric to blow out and spread the filament groups together with a compressed air flow. The filament outlets of each of the tubular bodies are distributed in the height direction, and a separation wall is provided between the filament outlets at different heights.

(Example) FIG. 1 is a side view showing a first example of the present invention.
2 and 3 are a front view and a perspective view, respectively, of the apparatus shown in FIG. 1 with some parts omitted. In these figures, the filament group 2 melt-spun from the spinneret 1 is placed under a plurality of ejectors 3a to 3f arranged along the width direction A (FIG. 2) of the web to be produced. At this point, it is pulled by a compressed air flow 4 introduced from a compression pump (not shown). This direction corresponds to a direction perpendicular to the traveling direction of a conveyor (not shown) for collecting filaments.

At the lower end of each of these ejectors 3a to 3f,
Filament outlet tubes 5a to 5f are provided as tubular bodies from which the filament group 2 is drawn out and spouted out. Furthermore, opening nozzles 6a to 6f are provided at the lower ends of these filament outlet tubes 58 to 5f, respectively. The opening nozzles 6a to 6f have tongue-shaped inner surfaces,
This tongue-shaped inner surface is used to collide a group of filaments to perform fiber opening, and is the same as that disclosed in Utility Model Application No. 57-111888.
Since the structure of 6f itself is unrelated to the gist of the present invention, a detailed explanation will be omitted.

As can be seen from Figures 1 and 2, this device:
By installing these opening nozzles 6a to 6f at different heights for each group, the openings R of the openings R of the opening nozzles 6a to 6f, which correspond to filament jetting ports, can be arranged and distributed in the height direction. There is. That is, in this embodiment, the filament outlet ports of the filament outlet tubes 5a and 5b are arranged in the uppermost stage (Fig. 2), and each set of the filament outlet tubes 5b, 5e and 5c, 5f is arranged as follows. They are arranged in the row ■ and the bottom row ■, respectively. In the bundle, every second filament outlet is at the same height.

Separation walls 7A to 7D are provided between each stage ■ to ■ and above the top stage ■ and below the bottom stage ■.

Furthermore, each filament group is connected to these isolation walls 7A.
An upper collecting plate 8A and a lower collecting plate 8B (FIG. 1) for colliding and collecting each filament group are arranged at the top and bottom of the position where the filaments are discharged to the outside of the filaments 7D.

However, the description of these collecting plates 8A and 8B is omitted in FIGS. 2 and 3. Note that a secondary collision plate 9 is provided in front of the frontage of each of the opening nozzles 6a to 6f.

Next, the functions of each member when such an arrangement is adopted will be explained. First, the filament group 2 is pulled by the ejectors 3a to 3f in the same manner as in conventional devices, and the filament group 2 pulled in this way passes through the filament outlet tubes 5a to 5f and the opening nozzles 6a to 6f. The filament is opened and jetted from the filament spout R. This filamecyte group collides with the secondary collision plate 9, and the distance is 11! In each space partitioned by walls 7A to 7D, the liquid collides with isolation walls 7B to 7D defining the lower ends of each stage (1) to (2), respectively, and is then discharged to the outside of these spaces.

In this operation, each construction ~■ is the isolation wall 7B,
Since they are separated by 7C, the air flows from each filament outlet belonging to each construction ~■ do not interfere with each other. In addition, the distance between adjacent filament lead-out tubes is P
. (FIG. 2), the filament jet ports belonging to the same stage have a sufficient interval of P=3Po, and there is no interference between the spindles between the same stages.

Therefore, each filament group is opened and falls independently, and the problem of formation of ridges as in conventional devices is solved. In addition, in this embodiment, the collecting plates 8A, 8
By providing B, the filaments ejected from each filament ejection port gather in the height direction, and when falling and depositing on the conveyor, the falling filaments flow in the direction of the conveyor. This results in the formation of a more homogeneous web without any dispersion.

The results of experiments conducted for the purpose of confirming the effects of such a configuration are as follows. First, polyethylene terephthalate was spun using a spinneret with 72 holes per 10 gold, and P□
When a web was produced using a conventional apparatus in which filament jet ports were arranged in a horizontal row at intervals of = 160 g+, the formation of ridges was clearly observed in the obtained web. On the other hand, in the above example using the same material and base, P□ = 160
In a device configured with #1ll, P = 480 shoes,
No ridges could be detected in the web by visual inspection. Thus, it has been demonstrated that web uniformity is significantly improved using this device.

FIG. 4 shows a second embodiment of the invention. Also in this embodiment, the separating walls 13A to 13C and the collecting plate 14A
, 14B are provided.

By the way, the filament group 15 passes through the filament outlet pipes 11a and 11b and is delivered to the opening nozzles 12a and 12b.
When it collides with the tongue-shaped inner surface of the fiber, it becomes electrically charged due to friction, and the electrostatic repulsion causes it to open. Therefore,
In this second embodiment, the power supply 16 is connected to the isolation walls 13A to 13.
C and the collecting plates 14A and 14B, these are charged to the same polarity as that of the filament group 15, thereby separating the filament group 15.

This prevents it from clinging to the Ill walls 13A to 13G and the collecting plates 14A and 14B. Therefore, in this case,
Isolation walls 13A to 13C and gathering board 14A.

14B and other members are insulated. Note that this charging is applied to the isolation walls 13A to 13C and the collecting plates 14A and 14.
Although it is desirable to do both of B, there is some effect even if only one is done.

FIG. 5 is a diagram showing an example of the arrangement of a device using the above-mentioned isolation wall, and the ejector 21a shown in this diagram
, 21b are pulled by a compressed air flow, and the filament m1 is pulled by electric discharge by electrodes 22a and 22b.
It is configured as a type that performs i4t. The filaments that have passed through the filament outlet tubes 23a and 23b extending from these ejectors 21a and 21b, respectively, are ejected from the filament spouting section 24 having the above-mentioned separating wall and collecting plate, and the filaments 2
5 is deposited on the conveyor 26.

Of the filament lead-out tubes 23a and 23b shown in this figure, the latter is a conventionally used straight tube, but the former has a new structure. That is, this filament lead-out IF 23a includes a first portion 27 extending substantially vertically downward from the lower end of the ejector 21a, and a first portion 27
A bent tube including a second portion 28 that is bent from the lower end and extends in a direction with a horizontal component, and a third portion 29 that is bent from the end of the second portion 28 and extends substantially vertically downward. It is formed as.

By adopting such a bent pipe, ■ jetter 21a,
It becomes possible to independently determine the arrangement position of 21b and the arrangement position of the filament spout, and the effectiveness of the device according to the present invention is further improved. However, if the shape of the bent tube is arbitrarily selected, problems may occur in securing the fiber quality and opening the fibers. length 11
~l, 11 are 600m to obtain sufficient thread quality.
The above length is desirable, and 13 is preferably 400 m or more for aligning and opening the filaments. j22 is arbitrary.

Further, in this example, an opening 30 for handling air is provided near the upper end of the first portion 27. This opening 30 is
By discharging a portion of the compressed air flow to the outside, it is provided to reduce the influence of air flow passage resistance in the following parts, and in this embodiment, As shown in FIG. 6, a total of eight circular through holes 31 each having a diameter of 1#IIl are provided concentrically in two stages of four holes in a filament outlet tube 23b having a diameter of 6 m.

Actual measurement data regarding the effect of installing this opening 30 is shown in FIG. This figure shows actual measured values for the two types of bent pipe shapes shown in (a) and (b), and shows the above-mentioned through hole 3.
The case where 1 is provided is the curve shown by ◯ and ∆ marks. As can be seen from this figure, by providing the through holes 31, the supply air space can be reduced when the spinning speed is constant, and when the same amount of supplied air is given, the spinning speed can be increased. can be achieved.

By the way, the present invention is not limited to the above-mentioned embodiment, and for example, the following modifications are also possible.

■It is desirable to provide isolation walls not only between the filament spouts of different heights, but also at the upper and lower end positions, as shown in isolation walls 7A and 7D in Figure 1, but it is prohibited to provide only the former. It's not a thing.

■There are no restrictions on the distribution of the filament spouts in the longitudinal direction or the number of separation walls, and the structure may be structured in any number of stages as shown in FIG.

■Although a fiber opening nozzle is used in the above embodiment, it is not essential to use this; for example,
As disclosed in No. 30, the filament may be ejected directly from the filament outlet tube itself.

Therefore, the "filament spout" in this invention
This refers to a general opening in which filament is ejected directly or indirectly from a filament outlet tube.

(Effects of the Invention) As explained above, according to the present invention, the filament spouts are distributed in the height direction and are separated by the partition 1111, so that the flow from each filament spout is The filament ejection becomes independent, and a high-quality nonwoven fabric can be produced without imparting unevenness such as ridges to the web.

[Brief explanation of drawings]

1 to 3 are a side view, a front view, and a perspective view, respectively, of a first embodiment of the invention. FIG. 4 is a diagram showing a second embodiment. FIG. 5 is a diagram showing an example of the arrangement of a device to which an embodiment of the present invention is applied. FIG. 6 is a diagram showing an example of the opening of the bent pipe. FIG. 7 is a graph showing actual measurement data verifying the effect of providing an opening in a bent pipe. FIG. 8 is a diagram showing a modification of the invention. 1... Spinneret, 2.25... Filament group 3a
~3f... Ejector, 5a ~5f, 23a, 23b... Filament outlet tube

Claims (3)

[Claims] (1) In a nonwoven fabric manufacturing apparatus that manufactures a nonwoven fabric by ejecting and opening a group of filaments through a tubular body together with a compressed air flow and collecting the filament group on a predetermined collection surface, the tubular body has a width of the nonwoven fabric. A nonwoven fabric manufacturing apparatus, characterized in that a plurality of filament outlets of the tubular body are arranged along a direction, the filament outlets of each of the tubular bodies are distributed in the height direction, and a separation wall is provided between the filament outlets of different heights. . (2) A patent in which collecting plates are provided at the top and bottom of the position where the filament groups are discharged from the filament jet ports to the outside of the separation wall for colliding and collecting the filament groups from each jet port. A nonwoven fabric manufacturing apparatus according to claim 1. (3) The nonwoven fabric manufacturing apparatus according to claim 2, wherein the separating wall and/or the collecting plate are charged with the same polarity as the charged polarity of the filament.