JPH04257362A - Device of producing nonwoven fabric - Google Patents

Abstract

PURPOSE:To obtain a device of producing nonwoven fabrics, stably manufacturing nonwoven fabrics having excellent uniformity. CONSTITUTION:A chamber having a section area decreasing with approaching to the tip is installed, a temperature regulator to maintain the internal surface of the chamber at a given temperature is arranged in the chamber, a spinning nozzle is set at the side of an opening having a large area of the chamber. Filament is introduced into the chamber, a blowing part 7 for sending air preadjusted to proper temperature, humidity and pressure from the periphery of the spinning nozzle to the side of the opening having a small area of the chamber is laid, the opening part having a small area of the chamber is provided with a guiding part to take in discharged filament and the filament introduced to the guiding part is successively adhered to a collecting face.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a nonwoven fabric manufacturing apparatus.
In particular, it relates to an apparatus for continuously producing nonwoven fabrics.

0002

2. Description of the Related Art Melt blowing is generally known as a method for producing nonwoven fabrics. In this method, a group of thermoplastic resins is sprayed from a melt-blowing die toward a collection surface in which many holes are formed. The principle of melt blow die is to arrange a large number of thin capillary tubes in a straight line, sandwich them from above and below between two gas plates, and blow out high pressure gas from between the gas plates and the capillary tubes to extrude the molten resin from the capillary tubes. is made into filaments and collected and deposited on the collection surface.

0003

[Problems to be Solved by the Invention] However, in the conventional method described above, the molten resin extruded from the capillary tube is stretched and dispersed in free space. It is difficult to set ideal temperature distribution and speed distribution, and spinning becomes unstable. Moreover, since a method of vertically collecting and depositing thread groups on a single collection surface was adopted, there was a problem in that a nonwoven fabric with excellent uniformity could not be obtained.

Alternatively, as shown in FIG. 3, there is a method in which a filament 24 extruded from a capillary tube is passed through a flow path 21 and fixed on a collection surface 22 that moves in the direction of the arrow. The uneven deposition that occurs when the nonwoven fabric A falls onto the substrate 22 directly appears as unevenness in the width and moving direction of the nonwoven fabric A.

The present invention has been made in view of the above-mentioned problems, and a technical object thereof is to provide a nonwoven fabric manufacturing apparatus capable of stably manufacturing a nonwoven fabric with excellent uniformity.

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned technical problems, the present invention has the following configuration.

That is, a chamber is provided whose cross-sectional area decreases as it approaches the tip, a temperature regulator is arranged in this chamber to maintain the inner surface of the chamber at a predetermined temperature, and a spinning nozzle is installed on the large-area opening side of the chamber. A blowing section is provided for discharging the filament into the chamber and sending air whose temperature, humidity, and pressure have been adjusted in advance from around the spinning nozzle to the small-area opening side of the chamber. An introduction part for taking in the discharged filaments was provided in the part, and the filaments introduced into the introduction part were successively adhered onto the collection surface.

[0008] The introduction section may be composed of two rollers arranged close to each other. Alternatively, the introduction part may be connected to a plurality of rollers and a belt stretched between these rollers.
The belts can be arranged in pairs, and these belts can be arranged in close proximity to each other.

[0009] Furthermore, the roller may be formed of an air-permeable annular body, and an air suction duct may be disposed on the inner surface of the roller.

0010

[Operation] The chamber is maintained at a predetermined temperature distribution by a temperature regulator placed on the inner surface of the chamber. Then, the molten resin is introduced into the chamber from a spinning nozzle provided on the large-area opening side of the chamber and turned into filaments. On the other hand, air whose temperature, humidity, and pressure have been adjusted in advance is sent from around the spinning nozzle to the small-area opening side of the chamber, and the filament is discharged from the small-area opening of the chamber.

[0011] The discharged filaments are introduced into the introduction section, and the filaments are fed onto the collection surface and are sequentially adhered to form a nonwoven fabric.

[0012] For example, in the case where the introduction section is composed of two rollers arranged close to each other, the filament is drawn in between these rollers, crushed to a certain thickness, and transferred onto the collection surface where it is fixed. Furthermore, when the introduction section is configured with a plurality of rollers and two sets of belts stretched between these rollers, the filament is drawn in by these belts. In addition, when 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. can.

[0013]

[Embodiment] An embodiment of the present invention will be explained based on FIGS. 1 and 2.

[0014]

[First Embodiment] The chamber 1 has an exponentially curved shape, and is formed so that the cross-sectional area decreases as it reaches the tip. In FIG. It opens in the shape of a wide slit.

A large number of temperature regulators 2 are arranged on the inner surface of the chamber 1 to maintain the inner surface of the chamber 1 at a predetermined temperature. This temperature regulator 2 is a radiator-like heat exchanger, and by passing temperature-controlled water or refrigerant through pipes 2a and 2b connected to the temperature regulator 2, the chamber 1 is heated.
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 . Then, the molten resin 5a is extruded from the spinning nozzle 4 into the chamber 1. A gap 30 is provided between the large-area opening of the chamber 1 and the spinning nozzle 4, and a blowing section 7 is connected continuously to the gap 30. This blower section 7 is for sending air whose temperature, humidity, and pressure have been adjusted in advance to the small-area opening side 6 of the chamber 1.

The molten resin 5a extruded from the spinning nozzle 4 is stretched by the air flow from the blowing section 7, becomes a filament 5, and is discharged from the small-area opening 6 of the chamber 1.

A filament 5 is provided below the small area opening 6.
An introduction section 8 is provided for introducing the filaments 5, and the filaments 5 introduced into the introduction section 8 are successively adhered onto a collection surface 9 using a so-called screen belt. That is, the introduction section 8 is composed of 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 its air suction port is opened close to the inner surface of the roller 13.

[0018] Air is drawn to the surface of the roller 13 by suctioning the air with an air suction device (not shown). Note that although the air suction duct 12 is provided on each roller 13, only one of the air suction ducts 12 is formed larger in shape. The reason why the size of the air suction duct 12 is different is that the long filament 5 is attracted to one of the two rollers 13 and the collection surface 9 is
This is to determine the direction of installation. Only the roller 13 on the side where the filament 5 is to be attracted for a long time is brought into contact with the collection surface 9. Further, a suction box 20 is disposed close to the bottom of the collection surface 9. This suction box 20, like the air suction duct 12, suctions the air on the collection surface 9 to improve the adhesion of the filament 5.

An example of operation will be explained below. First, the molten resin 5a extruded from the thread nozzle 4 is drawn by the air flow from the blowing section 7 and becomes a filament 5. Here, the flow rate, temperature, and humidity of the air sent from the air blower 7 and the temperature distribution on the inner wall of the chamber 1 controlled by the temperature regulator 2 are set to be optimal for spinning. Furthermore, since the cross section inside the chamber 1 gradually becomes smaller, 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 has a small area opening 6
is ejected at high speed. At this point, the air suction duct 12
is drawing in the surrounding air, and the roller 13,
13 rotates in the direction of the arrow, and the ejected filament 5 is drawn into the trough between the rollers 13 and 13 while being attracted.

Then, as mentioned above, one roller 13
It is laid on the collection surface 9 in a state where it sticks to the surface. Since the collection surface 9 is in the form of a belt and runs in the direction of the arrow, the nonwoven fabric A is continuously produced.

[0021] A plurality of the above-mentioned devices can be provided in the traveling direction of the collecting surface 9, and the nonwoven fabric A of a desired thickness can be manufactured. FIG. 1 shows an example in which two sets are arranged. Further, although the chamber 1 is wide in the above embodiment, it may have a circular cross section and a plurality of chambers may be arranged in a direction perpendicular to the direction of movement of the collection surface 9.

According to the above structure, the filament 5 is once accumulated in the trough between the rollers 13, 13, but if unevenness, for example, a dent occurs in this accumulated area, the filament 5 will be removed from the trough. Since the filaments 5 are deposited in a concentrated manner, a fixed amount of the filaments 5 are always discharged from the gap between the rollers 13 and 13. In this way, the rollers 13, 13 have a so-called buffer effect and contribute to making the nonwoven fabric uniform.

[0023]

[Second Embodiment] FIG. 2 shows another embodiment. Note that the same parts as those described in the first embodiment are given the same reference numerals, and the description thereof will be omitted.

The difference from the first embodiment is the structure of the introduction section 8, in which two sets of belts 11 are provided between two rollers 10, 10, of which only one belt 11 is provided. is in contact with the collection surface 9. An air suction duct 12 is provided on the rollers 10, 10 near the collection surface 9. The belt 11 is made of net and has good air circulation. The two belts are arranged in a valley shape at an angle of about 60 degrees, and the filament 5 falling from above is received by the belt 11 and transported downward. When the filament 5 reaches the bottom of the valley, the suction force of the air suction duct 12 causes one of the belts 1 to
1 is laid on the collection surface 9 in a state that it is stuck to the surface. In this embodiment, the device from the spinning nozzle 4 to the introduction section 8 is connected to the collecting surface 9.
Three sets are arranged along the direction of travel.

The other operations are the same as those in the previous embodiment, and will therefore be omitted.

[0026]

Effects of the Invention According to the present invention, since the inside of the chamber can be controlled to the optimum state for spinning, a nonwoven fabric with excellent uniformity can be stably produced.

[Brief explanation of the drawing]

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

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

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

[Explanation of symbols]

1...Chamber, 2. Temperature regulator, 3...Large area opening side, 4. Spinning nozzle, 5. Filament, 6...Small area opening, 7...Blower section, 8.Introduction, 9. Collection surface, 10... Laura, 11...belt, 12...Air suction duct, 13. Laura.

Claims (4)

[Claims] [Claim 1] A chamber whose cross-sectional area decreases toward the tip, a temperature regulator for maintaining the inner surface of the chamber at a predetermined temperature, and a spinning nozzle disposed on the large-area opening side of the chamber. A blowing section is provided to introduce the filament into the chamber and to send air whose temperature, humidity, and pressure have been adjusted in advance from around the spinning nozzle to the small-area opening side of the chamber. 1. A nonwoven fabric manufacturing apparatus, comprising: an introduction section for taking in discharged filaments; and a structure in which the filaments introduced into the introduction section are successively adhered onto a collection surface. 2. The nonwoven fabric manufacturing apparatus according to claim 1, wherein the introducing section is composed of two rollers arranged close to each other. 3. The nonwoven fabric production according to claim 1, wherein the introduction section is provided with a plurality of rollers and two sets of belts stretched between these rollers, and these belts are provided close to each other. Device. 4. The nonwoven fabric manufacturing apparatus according to claim 2, wherein the roller is formed of an annular body that is permeable to air, and an air suction duct is arranged on the inner surface of the roller.