JPH07310271A - Filament suction pipe and nonwoven fabric producing device using the same - Google Patents

Abstract

PURPOSE:To provide a filament-sucking pipe which can draw the broken yarn into the air sucker automatically in no need of manual operation, even when yarn break occurs due to some reason, among the mass of filaments, during the time when they are extruded. CONSTITUTION:This filament-sucking pipe 4 is composed of a filament catcher 10, an air sucker 11, suction pipe 12 and collision plates 13, 14. The filament catcher 10 is made in a circular cone or quadrangular pyramid form whose top is opened, or in a circular or square cylinder form whose top is opened, and a face fastener 19 is fixed to their outer surfaces. In the meantime, the nonwoven fabric producing device 1 is composed of a filamentsucking pipe 4, a web conveyer such as a mesh conveyer 20, a driving means therefor 21 and a couple of nipping rollers 25, 26 arranged vertically set above the driving means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filament suction tube which sucks a plurality of filaments melt-spun from a spinneret and draws them at a predetermined magnification, and at the same time, collides with a subsequent collision plate to open the filament, and a suction tube for this suction tube. The present invention relates to improvement of a nonwoven fabric manufacturing apparatus using a tube.

[0002]

2. Description of the Related Art The so-called spunbond method has been known as a method for manufacturing a nonwoven fabric. In this method, a filament group spun from a spinneret having a plurality of holes is sucked together by a suction tube having an air sucker to be stretched to a predetermined fineness, and is collided with a collision plate provided at the end. Then, the fibers are opened, and the opened filament bundles are dispersed on a moving plane such as a net conveyor to manufacture a nonwoven fabric having a predetermined width and thickness. Then, the web spread in the width direction on the net conveyor is transferred backward by the conveyor, and after passing through the transfer platform provided at the end of the conveyor, the nonwoven fabric having the final thickness is heated and nipped by the pair of nip rollers. Was formed.

[0003]

However, in the conventional suction tube and non-woven fabric manufacturing apparatus, when the filament to be sucked has a fineness of about 2 to 5d, a yarn breakage occurs due to some trouble directly below the spinneret. , The filaments that fall from the base are piled up around the air sucker, and sometimes they become filament lumps and are intermittently drawn into the air sucker, which causes clogging in the air sucker and forms on the net conveyor. There is a problem in that the non-woven fabric to be manufactured can be manufactured only with poor quality having unevenness in both width and running direction.

When the filament has a fineness of 5d or more and a high spinning speed of 3000m / min or more, the filament mass is too heavy to come off from the air sucker and be placed on the work floor. There was a problem that air suckers could not be sucked in at all since they were only accumulated.

As a solution to these problems, it is conceivable to strengthen the monitoring by the worker or to arrange a sensor for electrically detecting the accumulation. It is not a good idea because it exists. Therefore, in either case, there is a problem that a nonwoven fabric of excellent quality having no unevenness in the web width and running direction cannot be manufactured.

On the other hand, in a conventional non-woven fabric manufacturing apparatus in which the collecting net conveyor is nipped to a predetermined thickness by nip rollers after passing through the transfer platform or when the transfer platform is not provided, the webs scattered on the conveyor are used. When the width is narrow and the thickness is large, there is no problem. However, recently, as demands from users, the strength of the lateral sheet has been increased, and the demand for wide and thin sheets has expanded, and the width of the web has become wider than 3 m and the thickness thereof has become thinner than 0.5 mm. , The conveyor width is wide and the conveying speed is 50m / m.
Since the speed is more than in, and the diameter of the nip roller is also large, the web is misaligned when passing through the transfer platform, and wrinkles are formed in the finally manufactured sheet. Further, there is a problem that a sheet of a predetermined quality cannot be obtained because a sufficient amount of heat is not transferred to the web by simply pressing and heating the nip.

The present invention has been made in view of the above-mentioned drawbacks of the prior art. Even when a yarn breakage occurs during spinning for some reason, the operator automatically puts it in the suction tube without any intervention. An object of the present invention is to provide a filament suction tube that can be drawn in and a nonwoven fabric manufacturing apparatus that uses this suction tube.

[0008]

In order to achieve the above object, a filament suction tube according to the present invention is a filament suction tube that sucks a plurality of melt-spun filament groups from a spinneret and stretches them at a predetermined ratio. There is a cone or quadrangular pyramid with an upper opening, and a filament catcher that captures the filament group spun from the die, an air sucker that sucks the captured filament group, and a filament that is sucked by the air sucker A suction pipe for stretching the group to a predetermined stretching ratio and a collision plate for colliding the stretched filament group to open the mutual filament interval are integrally formed. This filament suction tube is a filament suction tube that sucks a plurality of spun filament groups melt-spun from a spinneret and stretches at a predetermined ratio, and is a cylinder or square tube with an upper opening and a cylinder or square tube of the cylinder or square tube. A filament catcher that is composed of a surface fastener fixed to the outer peripheral surface and captures the filament group spun from the die, an air sucker that sucks the captured filament group, and a filament group that is sucked by the air soccer A suction pipe that stretches at a stretching ratio and a collision plate that collides the stretched filament groups to open the mutual filament intervals may be integrally formed.

The nonwoven fabric manufacturing apparatus according to the present invention is
One of the above filament suction pipes and a filament group provided below the suction pipes and collected from the filament suction pipes are collected as a web of a predetermined width on the surface of a net conveyor extending in a direction away from the filament suction pipes. And a drive means for driving the web transfer means, and a nip roller having two upper and lower stages provided at a position separated from the drive means by a predetermined distance in the filament suction tube direction.

Here, in the above-mentioned nonwoven fabric manufacturing apparatus, it is preferable that the nip roller is provided at a position separated from the end of the net conveyor of the web conveying means to the upstream side in the filament suction tube direction by about 250 to 1000 mm. Further, the non-woven fabric manufacturing apparatus is further provided with a detection unit that detects that the web has reached the vicinity of the nip roller, and a pressing mechanism that presses the net conveyor in the direction of the nip roller based on a detection signal of the detection unit. Is preferred.

[0011]

According to the filament suction tube of claim 1, even if the filament group continuously spun from the die is cut for some reason, even if the filament fineness of the filament yarn is 5d or more, The opening of a filament catcher consisting of a cone or a quadrangular pyramid at the head of the suction tube captures the filament group that is successively dropped from the mouthpiece and guides it to the air sucker.

According to the filament suction tube of claim 2,
Even if the single filament fineness of the cut filament group is less than 5d, the filament group is caught by coming into contact with the hook-and-loop fastener during the process of dropping and accumulating from the periphery of the suction tube on the work floor and immediately accumulating. At the same time as cutting the group, the air sucker sucks and captures the filament group that is spun out sequentially from the upper die.

According to the nonwoven fabric manufacturing apparatus of the third aspect, the upper and lower nip rollers are provided at a predetermined distance from the filament suction tube and the drive means of the web conveying means toward the upstream side in the filament suction tube direction. As a result, a sufficient amount of heat is transferred to the web, and it is possible to form a sheet of a predetermined quality without deviation or wrinkles.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a filament suction tube and a nonwoven fabric manufacturing apparatus using this suction tube according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic side view of the nonwoven fabric manufacturing apparatus of the present invention. Explaining the schematic configuration of this device, the nonwoven fabric manufacturing device 1 is a filament group spun from a melt spinning spinneret 2 having a plurality of spinning holes and cooled to a predetermined temperature by a cool air blowing device 3 therebelow. Suck Y together.
Filament suction tube (hereinafter,
(Simply referred to as a suction tube) 4 and a plurality of filament groups Y scattered from the suction tube 4 are transferred rearward as a web 5 having a predetermined width and thickness, and a nip device 6 provided at the end.
Sheet forming device 8 for heat setting on a nonwoven fabric 7 of a certain thickness
It consists of and. Although not shown, the mouthpiece 2, the cold air blowing device 3 and the suction pipe 4 are so-called double-cone type in which two units, which are the same in the traveling direction of the web 5, are provided for each mouthpiece. Further, 9 is a work floor for the worker to clean around the mouthpiece and replace the suction tube 4 with the optimum one according to the kind of the spun filament group Y,
It is fixed between the cold air blowing device 3 and the suction pipe 4.

The suction tube 4 is a filament group Y to be suctioned.
In the case of a thick yarn of 5d or more and a high-speed spinning speed of 3000 m / min or more, a plurality of filament groups Y spun from the spinneret 2 are bundled together and the head is opened like a trumpet. Filament catcher 10A, air sucker 11 that sucks the focused filament group with a predetermined tension, suction pipe 12 that stretches the sucked filament group to a predetermined stretching ratio, and the suctioned filament group is opened as far as possible. The first collision plate 13 is scattered, and the second collision plate 14 is inclined and fixed at a position separated from the first collision plate 13 by a predetermined distance. The air sucker 11 is connected to the compressed air supply pipe 15, and is a so-called air ejector mechanism that can suck the filament group captured by the filament catcher 10A with a predetermined tension.

As shown in the perspective view of FIG. 2, the filament catcher 10A has a conical trumpet shape.
According to the fineness of the filament group Y spun from the die 2, a filament having a predetermined diameter or shape can be attached to and detached from the air sucker 11. The filament catcher 10A may have a trumpet shape or a triangular pyramid shape or a quadrangular pyramid shape as shown in the plan view of FIG. 3A or the perspective view of FIG. The diameter of the catcher 10A is 50 to 160 m in order for the air sucker to effectively capture the filament group that is broken during spinning for some reason.
It is preferably about m.

Using the catcher 10A of this embodiment,
Since the thick filament group Y spun from the mouthpiece 2 slides down from the inner peripheral surface 16 of the catcher 10A toward the center, the air sucker 11 can easily catch the leak. As shown in FIG. 3 (B) and FIG. 4 (B), if any catcher is provided with holes 17 having a diameter of about 1 to 5 mm at an opening rate of about 20 to 80%, the cap 2 is moved to the filament group Y. Since the airflow that has descended accompanyingly passes downward from this hole, it is possible to reduce the sway of the filament group that occurs when the airflow sucked together with the filament group is reflected upward from the inner peripheral surface 16 of the catcher 10. . If the porosity is less than 20%, the degree of reduction of the sway of the filament group becomes small, and conversely, if it exceeds 80%, the filament group easily passes through the holes together with the accompanying air flow, which is not preferable.

In FIG. 5, the filament group Y to be sucked is 5
It is a front view of the filament catcher 10B used when it is a fine article less than d. This catcher 10B
From the suction port 18 fixed to the upper part of the air sucker 11 and, for example, commercially available surface fasteners, adhesive tapes, sandpaper, etc. (hereinafter, these are collectively referred to as “face fasteners”) 19 wound around and fixed to the outer periphery thereof. It is configured. With this type of catcher 10B, the base 2
Even if the filament group Y spun from the filament yarn Y breaks due to some trouble and floats or accumulates around the chacha, the filament group Y is immediately drawn into the suction port 18 by the suction force of the air sucker 11. At the same time, the hook-and-loop fastener 19 captures unnecessary filaments floating or accumulated around the suction port 18 by its projection or adhesive force and cuts them, and sucks only a new fragment group spun out from the spinneret. To do. This action is naturally performed at the time when the yarn breakage occurs even if the operator does not particularly monitor the suction state of the eyelament group Y on the work floor 9, so it is very convenient even though it has a simple configuration. It is something. The shape of the suction port 18 may be a rectangular cylinder such as a triangular cylinder or a square cylinder other than the cylindrical shape of this embodiment. Further, the width L of the surface fastener 19 is preferably about 3 to 10 mm in order to capture the cut filament group. In the case of a thick monofilament having a single yarn fineness exceeding 5d, a heater cutter (not shown) may be provided around the surface fastener 19 for cutting.

On the other hand, as shown in FIG. 1, the sheet forming apparatus 8 includes an endless net conveyor 20, a driving roller 21 for driving the conveyor, a plurality of guide rollers 22, and a box-shaped suction member fixed to the lower surface of the conveyor 20. A pressing mechanism 24 that lifts the box 23, its exhaust fan 31, and the web 5 that has entered the nip roller 6 from below to above only when pressing.
It is composed of a web transfer means. A motor (not shown) for driving the net conveyor 20 is connected to the drive roller 20, and two upper and lower nip rollers 25 for forming the web 5 to a predetermined thickness are provided on the upper rear surface of the conveyor 20. A nip device 6 consisting of 26 is provided. The feature of the present invention is that the nip device 6 is not provided at the exit of the drive roller 21 through the passing platform as in the conventional device, but a distance L of 250 to 1000 mm from the drive roller 21 to the filament suction tube 4 side. In this position, the outer peripheral surface of the roller 25 is provided so as to contact the surface of the conveyor 20, and the web 5 is wound in the S shape in the order of the rollers 25 and 26. Each of the nip rollers 25 and 26 has a built-in heating means such as dielectric heating, steam, or an electric heater inside the nip rollers 25 and 26.
It can be heated to a certain degree. Further, the net pressing mechanism 24 is provided immediately below the nip roller 25, and includes the pressing roller 27, the driving roller 28, and the driving roller 2.
The drive chain 29 is provided on the shaft of the roller end portion for driving 8, and the air cylinder 30 that swings the pressing roller 27 with the center of the drive roller 28 as the swing center, and is conveyed to immediately before the nip roller 25. The web 5 thus received is detected by a web detecting means such as a limit switch (not shown) or a photoelectric tube, and the air cylinder 3 is detected by the detection signal.
0 moves upward to press the pressing roller 27 against the nip roller 25 via the net conveyor 20. According to the sheet forming apparatus 8 having such a configuration, the net conveyor 20 is pressed against the surface of the nip roller 25 only when the web 5 passes through the nip device 6, so that the net conveyor 20 is always pressed during preheating, cooling, etc. It is possible to prevent damage due to pressing as compared with the case of driving in.

[0021]

According to the filament suction tube of the first and second aspects, when the filament diameter of the filament group continuously spun from the spinneret is large, a cone or a quadrangular pyramid is attached to the head of the suction tube. Further, according to the filament suction tube of claim 1, when the filament yarn group has a small single yarn fineness, the filament kitcher is provided with a surface fastener, so that some trouble may occur during spinning. Thus, even if the filament group is cut, it can be automatically introduced into the air sucker with a simple configuration. Therefore, there is no need for the worker to monitor the work floor on the work floor, and the spinning can be continued with peace of mind.

According to the non-woven fabric manufacturing apparatus of claims 3 to 5,
Since the upper and lower nip rollers are provided behind the filament suction tube and the web conveying means, the heat quantity is sufficiently transmitted to the web and a sheet having a desired quality without wrinkles is formed.

[Brief description of drawings]

FIG. 1 is a schematic side view of a nonwoven fabric manufacturing apparatus according to the present invention.

FIG. 2 is a perspective view of a filament catcher used in the device of FIG.

FIG. 3 is a plan view of a filament catcher of an embodiment different from the filament catcher of FIG.

4 is a perspective view of a filament catcher of an embodiment different from the filament catcher of FIG. 3. FIG.

5 is a front view of a filament catcher of an embodiment different from the filament catcher of FIG. 4. FIG.

[Explanation of symbols]

 1 …… Nonwoven fabric manufacturing device 2 …… Base 4 …… Filament suction tube 5 …… Web 6 …… Nip device 8 …… Sheet forming device 10 …… Filament catcher 11 …… Ear soccer 20 …… Net conveyor 24 …… Pressing Mechanism 25: Nip roller 26: Nip roller

Claims (5)

[Claims] 1. A filament suction tube that sucks a plurality of spun filament groups melt-spun from a spinneret and stretches it to a predetermined magnification, which is composed of a cone or a quadrangular pyramid having an upper opening, and is spun from the spinneret. A filament catcher that captures the captured filament group, an air sucker that suctions the captured filament group, a suction pipe that stretches the filament group that is suctioned by the air soccer to a predetermined draw ratio, and the stretched filament group. A filament suction tube integrally formed with a collision plate that collides with each other to open the mutual filament space. 2. A filament suction tube for sucking a plurality of spun filament groups melt-spun from a spinneret and stretching the filament at a predetermined ratio, the cylinder or square tube having an upper opening, and the outer circumference of the cylinder or square tube. A filament catcher, which is composed of a surface fastener fixed to a surface, captures a filament group spun from the die, an air sucker that sucks the captured filament group, and a predetermined stretching of the filament group that is sucked by the air soccer. A filament suction tube integrally formed with a suction pipe stretched at a magnification ratio and a collision plate that collides the stretched filament groups to open the mutual filament intervals. 3. The filament suction pipe according to claim 1 or 2, and a net conveyor surface which is provided below the suction pipe and extends in a direction in which a filament group supplied from the filament suction pipe extends away from the filament suction pipe. A web conveying means for collecting as a web having a predetermined width, a driving means for the web conveying means, and a nip roller composed of two upper and lower stages provided at a position separated from the driving means by a predetermined distance in the filament suction tube direction. Non-woven fabric manufacturing equipment provided. 4. The nonwoven fabric manufacturing apparatus according to claim 3, wherein the position of the nip roller is upstream from the end of the net conveyor of the web transport means in the filament suction pipe direction. 5. The non-woven fabric manufacturing apparatus according to claim 4, wherein a detection means for detecting that the web has reached the vicinity of the nip roller, and the net conveyor is pressed in the direction of the nip roller based on a detection signal of the detection means. A nonwoven fabric manufacturing apparatus provided with a pressing mechanism.