JP2975433B2 - Non-woven fabric manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonwoven fabric manufacturing apparatus,
In particular, it relates to an apparatus for continuously producing nonwoven fabric.

[0002]

2. Description of the Related Art In general, a melt blowing method is known as a method for producing a nonwoven fabric. In this method, a group of thermoplastic resins is sprayed from a melt blow die toward a collecting surface having a large number of holes. The principle of the melt blow die is that a number of thin capillary tubes are linearly arranged, sandwiched between two gas plates from above and below, and high-pressure gas is blown out from between the gas plate and the capillary tubes to extrude molten resin from the capillary tubes. Is made into a filament and collected and deposited on the collecting surface.

[0003]

However, in the prior art described above, the molten resin extruded from the capillary tube is stretched and dispersed in free space, so that the air flow during spinning is used to form the yarn. It is difficult to set ideal temperature distribution and speed distribution, and spinning becomes unstable. In addition, since a method of vertically collecting and depositing a group of yarns on one collecting surface is employed, there is a problem that a nonwoven fabric having excellent uniformity cannot be obtained.

As shown in FIG. 3, there is a method of passing a filament 24 extruded from a capillary tube through a flow path 21 and fixing the filament 24 on a collecting surface 22 which moves in the direction of the arrow. The non-uniform deposition that occurs when the non-woven fabric A is dropped onto the non-woven fabric A directly appears as non-uniformity in the width and moving direction of the nonwoven fabric A.

[0005] The present invention has been made in view of the above problems, and has as its technical object to provide a nonwoven fabric manufacturing apparatus capable of stably producing a nonwoven fabric having excellent uniformity.

[0006]

The present invention has the following configuration in order to solve the above technical problems.

That is, a chamber whose cross-sectional area is reduced toward the tip is provided, a temperature controller for maintaining the inner surface of the chamber at a predetermined temperature is provided in this chamber, and a spinning nozzle is provided at a large area opening side of the chamber. A blower that discharges the filament into the chamber, and sends air whose temperature, humidity, and pressure have been adjusted in advance from the periphery of the spinning nozzle to the small-area opening side of the chamber; The section was provided with an introduction section for taking in the discharged filaments, and the filaments introduced into the introduction section were sequentially adhered to the collecting surface.

[0008] The introduction portion may be constituted by two rollers arranged in close proximity. Alternatively, the introduction portion may be configured by providing two sets of rollers and a belt stretched between the rollers, and providing these belts close to each other.

Further, the roller may be formed of an air-permeable annular body, and an air suction duct may be arranged on an inner surface of the roller.

[0010]

The chamber is maintained at a predetermined temperature distribution by a temperature controller arranged on the inner surface of the chamber. Then, a molten resin is introduced into the chamber from a spinning nozzle provided on the large-area opening side of the chamber to be turned into a filament. On the other hand, from the periphery of the spinning nozzle, air in which the temperature, humidity, and pressure are adjusted in advance is sent to the small area opening side of the chamber,
Filament is discharged from a small area opening of the chamber.

The discharged filaments are introduced into an introduction portion, and the filaments are fed onto a collecting surface and sequentially adhered to form a nonwoven fabric.

In the case of the introduction section, for example, when it is constituted by two rollers arranged close to each other, the filament is drawn between these rollers and is transferred to the collecting surface while being crushed to a certain thickness and fixed. Further, when the introduction section is constituted by a plurality of rollers and two sets of belts stretched between these rollers, the filaments are drawn by these belts. If the roller is formed of an air-permeable annular body and an air suction nozzle is arranged on the inner surface of the roller, the adhesion between the roller and the filament is ensured, and unnecessary diffusion of the filament is prevented. it can.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

[0014]

First Embodiment A chamber 1 has an exponential curve shape and is formed so that its cross-sectional area decreases toward the tip. In FIG. 1, a small-area opening 6 located at the lower end of the chamber 1 has It is open like a wide slit.

On the inner surface of the chamber 1, a number of temperature controllers 2 for maintaining the inner surface of the chamber 1 at a predetermined temperature are arranged. The temperature controller 2 is a radiator-like heat exchanger, and the temperature-controlled water or refrigerant is passed through pipes 2a and 2b connected to the radiator-like heat exchanger.
The inner surface is maintained at a predetermined temperature. A plurality of spinning nozzles (spinnerets) 4 are arranged on the large-area opening side 3 of the chamber 1. And this spinning nozzle 4
, The molten resin 5 a is extruded into the chamber 1. A gap 3 is provided between the large-area opening of the chamber 1 and the spinning nozzle 4.
0 is provided, and the air blower 7
Is connected. The blower 7 sends air whose temperature, humidity, and pressure have been adjusted in advance to the small-area opening side 6 of the chamber 1.
To be sent to

The molten resin 5a extruded from the spinning nozzle 4 is stretched by the air flow from the blower 7 and is emitted as a filament 5 from the small area opening 6 of the chamber 1.

Below the small-area opening 6, the filament 5
Is provided, and the filaments 5 introduced into the introduction section 8 are sequentially adhered to a collecting surface 9 using a so-called screen belt. That is, the introduction section 8 is constituted by two rollers 13 arranged close to each other, and the rollers 13 are formed of an air-permeable annular body. An air suction duct 12 having a fan-shaped cross section is arranged on the inner surface of the roller 13, and the air suction port is opened close to the inner surface of the roller 13.

The air is drawn into the surface of the roller 13 by sucking the air with an air suction device (not shown). The air suction duct 12 is provided on each of the rollers 13, but only one of them has a large shape. The reason why the size of the air suction duct 12 is different is that the filament 5 is long adsorbed on one of the two rollers 13 and the collecting surface 9 is formed.
This is to determine the direction of installation. Then, only the roller 13 on the side where the filament 5 is adsorbed for a long time is brought into contact with the collection surface 9. In addition, a suction box 20 is arranged below the collecting surface 9 so as to approach. The suction box 20 sucks the air on the collecting surface 9 similarly to the air suction duct 12 to improve the adhesion of the filament 5.

Hereinafter, an operation example will be described. First, the molten resin 5 a extruded from the yarn nozzle 4 is drawn by the airflow from the blower 7 and becomes a filament 5. Here, the flow velocity, temperature and humidity of the air supplied from the blower 7 and the temperature distribution on the inner wall of the chamber 1 controlled by the temperature controller 2 are set to be optimal for spinning. Further, the cross section of the inside of the chamber 1 is gradually reduced, so that the air is accelerated and the temperature is set to decrease as it reaches the small-area opening 6 under a general operating environment. The filament 5 thus formed is discharged from the small-area opening 6 at a high speed. At this point, air suction duct 1
2 draws in the surrounding air, and
The filaments 3 and 13 rotate in the directions indicated by the arrows, and the discharged filament 5 is drawn in while being sucked into the valleys sandwiched between the rollers 13 and 13.

Then, as described above, one of the rollers 13
It is laid on the collecting surface 9 in a state where it is stuck to. Since the collecting surface 9 is in a belt shape and runs in the direction indicated by the arrow, the nonwoven fabric A is continuously manufactured.

It is to be noted that a plurality of the above-described devices can be provided in the traveling direction of the collecting surface 9, and a nonwoven fabric A having a desired thickness can be manufactured. FIG. 1 shows an example in which two sets are arranged. In the above-described embodiment, the chamber 1 is wide. However, the chamber 1 may have a circular cross section, and a plurality of chambers may be arranged in a direction perpendicular to the traveling direction of the collecting surface 9.

According to the above configuration, the filament 5 is temporarily accumulated in the valley between the rollers 13, 13. If the accumulated portion has a non-uniformity, for example, a dent, the dent is formed in the recess. Since the filaments 5 are concentrated and deposited on the roller 13, a fixed amount of the filaments 5 is always discharged from the gap between the rollers 13, 13. Thus, the rollers 13 and 13 have a so-called buffer effect, and contribute to uniformity of the nonwoven fabric.

[0023]

FIG. 2 shows another embodiment. The same portions as those described in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The point of difference from the first embodiment is the structure of the introduction section 8, in which two sets of belts 11 are stretched between two rollers 10, 10, and only one of the belts 11 is provided. Is brought into contact with the collecting surface 9. An air suction duct 12 is provided on the rollers 10 and 10 near the collection surface 9. The belt 11 is formed of a net, and has good air circulation. The two belts are arranged in a valley shape at an angle of about 60 degrees, so that the filaments 5 that have fallen from above are received by the belt 11 and transferred downward. When the filament 5 reaches the valley bottom, the suction force of the air suction duct 12 causes the one belt 1
It is laid on the collection surface 9 in a state where it is attached to 1. In this embodiment, the device from the spinning nozzle 4 to the introduction unit 8 is a collection surface 9.
Are arranged along the traveling direction of.

The other operations are the same as those in the above-described embodiment and will not be described.

[0026]

According to the present invention, the inside of the chamber can be controlled to an optimum state for spinning, so that a nonwoven fabric having excellent uniformity can be stably manufactured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a side view showing another embodiment of the present invention.

FIG. 3 is a sectional view of a conventional device.

[Explanation of symbols]

 1. chamber, 2. temperature controller, 3. large area opening side, 4. spinning nozzle, 5. filament, 6. small area opening, 7. blower section, 8. introduction section , 9 ... collecting surface, 10 ... roller, 11 ... belt, 12 ... air suction duct, 13 ... roller.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D01D 1/00-13/02 D04H 1/00-18/00

Claims (4)

(57) [Claims] 1. A chamber having a cross-sectional area reduced toward a tip is provided, a temperature controller for maintaining an inner surface of the chamber at a predetermined temperature is disposed in the chamber, and a spinning nozzle is provided on a large-area opening side of the chamber. A blower for introducing the filament into the chamber, and for sending air preliminarily adjusted in temperature, humidity, and pressure from the periphery of the spinning nozzle to the small-area opening side of the chamber; and providing a small-area opening of the chamber. A non-woven fabric manufacturing apparatus characterized in that an introduction part for taking in the discharged filament is provided in the part, and the filament introduced into the introduction part is sequentially adhered on the collecting surface. 2. The nonwoven fabric manufacturing apparatus according to claim 1, wherein said introduction portion is constituted by two rollers arranged close to each other. 3. The nonwoven fabric manufacturing method according to claim 1, wherein the introduction section is provided with a plurality of rollers and two sets of belts stretched between the rollers, and the belts are provided close to each other. apparatus. 4. The nonwoven fabric manufacturing apparatus according to claim 2, wherein the roller is formed of an air-permeable annular body, and an air suction duct is disposed on an inner surface of the roller.