JP3122826B2 - Melt blow device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melt-blowing apparatus capable of forming a nonwoven fabric made of fibers having two different properties.

[0002]

2. Description of the Related Art Conventionally, as a melt-blowing apparatus, industrial and engineering chemistry by Van A. Vente (Vol. 48, No. 8, 1
An apparatus as shown in pages 342 to 1346) is generally known. This device is for obtaining melt-blown non-woven fabric from a single resin, and it is possible to mix different resins at the stage of molten resin, but it is not possible to give different properties of resin in the state of fiber. Did not.

In contrast, US Pat. No. 3,981,650
In Japanese Patent Application Laid-Open Publication No. H11-157, an apparatus for obtaining a melt-blown nonwoven fabric from fibers having two different properties (see FIGS. 6 and 7) is proposed.

For example, the conventional two-component die head shown in FIG. 6 has two symmetrical parts 1a and 1b.
And the wall 3 separating the first reservoir 2a and the second reservoir 2b are firmly joined by bolts or welding to form an assembly, or the die head is integrally formed by casting, and then the resin is poured from the reservoir direction. It is described that the flow path upper part 4a is provided as an integral molded article in which a resin flow path is formed by drilling a resin flow path lower part 4b with a drill from the spinning port direction.

[0005] A die head composed of an assembly can be easily manufactured. However, if used for a long time, the joint will be distorted due to thermal expansion or the like, and as a result, resin leakage or resin mixing will occur. there were. In particular, 2
For a two-component die head that aims to utilize the properties of two different resins in melt-blown nonwovens,
Mixing this resin was a major drawback.

On the other hand, in the die head obtained by integral molding, the above-mentioned problem is solved, but a large number of fine resin flow paths are pierced by being drilled from the upper and lower surfaces.
Accurate placement in a row requires complex design and fabrication,
The equipment was very expensive. Also, it is extremely difficult to smoothly process the junction 4c between the resin flow path 4a and the resin flow path 4b. If the junction is not processed smoothly, resin will stagnate at the junction. However, there has been a problem that the yarn generated by the decomposition of the retained resin may cause yarn breakage. For this reason, polymer balls called shots also occur in the obtained product, which is a cause of lowering the quality of the product.

In US Pat. No. 3,981,650, an integrally molded die head as shown in FIG. 7 is obtained by fitting a curved tube 5 or by drilling a curved orifice. Is also described. However, when the tube is fitted, as in the case of the assembly, a problem due to heat distortion occurs, and it is virtually impossible to form a curved orifice by drilling as shown in FIG. Yes, even if it is possible, it requires sophisticated and complicated techniques, and is expected to be very costly and impractical.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems such as mixing due to resin leakage and yarn breakage due to stagnant resin, and can be easily manufactured.
It is an object of the present invention to provide a component-based melt blow device.

[0009]

According to the first aspect of the present invention, there is provided a melt-blowing apparatus capable of forming a non-woven fabric made of fibers having two different properties. The melt blow device is characterized in that an orifice is provided vertically penetrating from the upper surface of the nozzle piece to the pointed end, and a resin distribution structure is formed at a boundary surface between the upper surface of the nozzle piece and the lower surface of the die body. Abstract.

According to the second aspect of the invention, the nozzle orifices for guiding one resin to the spinning port and the nozzle orifices for guiding the other resin to the spinning port are alternately provided in the width direction on the center line of the nozzle piece. The gist of the present invention is a melt blow apparatus characterized by the following.

According to the third aspect of the present invention, the resin is distributed by a distribution path and a supply path formed in a width direction on a boundary surface between the upper surface of the nozzle piece and the lower surface of the die body. The gist of the melt blower is as follows.

The gist of the invention according to claim 4 is that the melt blow apparatus is characterized in that the tip angle of the nozzle piece is 40 to 70 degrees.

Hereinafter, the melt blower of the present invention will be described in detail with reference to the drawings. The melt blow apparatus 11 shown in the drawing includes a die body 12, a nozzle piece 13 attached to the die body 12 with bolts, and an air lip plate 14. It should be noted that the melt blow apparatus 11 shown in the drawings is merely an illustrative example, and each configuration can be appropriately changed within the scope described in the claims.

As shown in FIGS. 1, 2 and 3, resin inlets 15 a and 15 b for receiving two different molten resins are provided at the upper part of the die body 12. Flow paths 16a, 16b processed in a slit shape for distributing the molten resin supplied from the resin inlets 15a, 15b in the width direction of the die body 12, and from the resin inlets 15a, 15b to the flow paths 16a, 16b. Flow paths 17a and 17b for guiding the molten resin are provided. In addition, an extruder for feeding the molten resin and a heater for melting the resin are provided above the die body 12 for each of the resin inlets 15a and 15b, and two different ones are provided. The resin is melted at different temperatures and can be extruded at different pressures. At both left and right ends of the die body 12, gas supply ports 18 for taking in heated gas are arranged, and gas supply pipes 19 are provided inside.
Is arranged. It should be noted that a device for obtaining a uniform airflow may be employed for the gas supply pipe 19.

The air lip plate 14 is a plate attached to the lower part of the die body 12 with bolts in a state of being joined to the nozzle piece 13. The air lip plate 14 is joined to the nozzle piece 13, and this is attached to the lower part of the die body 12. When attached, a slit-shaped gap to be a supply path of the heating gas, that is, an air slot 20 is formed between the nozzle piece 13 and the air lip plate 14. The heating gas from the gas supply pipe 19 is injected near the spinning port 24 through the air slot 20, and the molten resin is drawn and narrowed by the injection force.

Next, the distribution structure of the molten resin formed on the boundary surface between the upper surface of the nozzle piece and the lower surface of the die body will be described. As shown in FIGS. 1, 2 and 3, distribution grooves 21 a and 21 b are formed on the upper surface of the nozzle piece 13 at positions substantially symmetric with respect to the center line A of the nozzle piece 13 in the width direction of the nozzle piece 13. Is formed across. In addition, supply grooves 22a and 22b are formed from the distribution grooves 21a and 21b, respectively, toward the center line A and at regular intervals in the width direction of the nozzle piece 13.

The nozzle piece 13 is connected to the die body 12
To the distribution grooves 21 a and 21 b and the lower surface of the die body 12, and from the supply grooves 22 a and 22 b and the lower surface of the die body 12, a distribution path is formed at the boundary surface between the upper surface of the nozzle piece 13 and the lower surface of the die body 12. 25a, 25b
Thus, a distribution structure composed of and the supply passages 26a and 26b connected thereto is formed. The molten resin from the resin inlet 15a is guided to the distribution path 25a thus formed through the flow path 17a and the flow path 16a, and is supplied to the supply path 26a.
Through the nozzle orifice 23a. In addition, the resin inlet 15b is connected to the distribution path 25b.
Is fed through the flow path 17b and the flow path 16b, and is supplied to the nozzle orifice 23b through the supply path 22b.

The distribution structure shown in the drawing is composed of distribution grooves 21a and 21b formed on the upper surface of the nozzle piece 13, supply grooves 22a and 22b, and the lower surface of the die body 12. It is not limited. For example, as shown in FIG. 4, the distribution grooves 21a and 21b and the supply grooves 22a and 22b are formed on the lower surface of the die body 12, and when the nozzle piece 13 is attached to the lower surface of the die body 12, the lower surface of the die body 12 Distribution channels 25a and 25b between the distribution groove and the supply groove formed in the nozzle piece 13 and the upper surface thereof.
A distribution structure including the supply passages 26a and 26b may be formed. Also, distribution grooves and supply grooves are formed on the lower surface of the die body and the upper surface of the nozzle piece, respectively, and the nozzle pieces are attached to the die body. A distribution structure of the molten resin may be formed.

In the nozzle piece 13, a plurality of nozzle orifices 23a and nozzle orifices 23b are alternately provided on the center line A of the nozzle piece 13 at regular intervals in the width direction. Then, the molten resin guided to the distribution path 25a reaches the nozzle orifice 23a via each supply path 26a, and is spun from the spinning port 24a at the lower end side of the nozzle orifice 23a. Similarly, the molten resin guided to the distribution passage 25b reaches the nozzle orifice 23b via each supply passage 26b, and is supplied to the nozzle orifice 2b.
The spinning is performed from a spinning port 24b on the lower end side of the spinner 3b.

The nozzle orifice 23a and the nozzle orifice 23b are provided to penetrate the nozzle piece 13 vertically from the upper surface to the lower surface. These nozzle orifices 23a and 23b can be formed by drilling straight holes extending from the upper surface of the nozzle piece 13 to the lower surface (the tip of the nozzle piece 13). The diameter of the nozzle orifices 23a, 23b, ie, the spinnerets 24a, 24b
Has a diameter of preferably 0.1 to 0.8 mm. Note that the diameter of the nozzle orifice may vary, and for example, as shown in FIG. 5, the upper part of the nozzle orifice 23 may have a larger diameter than the lower part. The spinneret 24a and the spinneret 24b may have different diameters. Further, by inserting a metal pipe into the perforated holes of the nozzle orifices 23a and 23b,
The wall surfaces of a and 23b may be made smooth so that the molten resin can pass smoothly.

The tip angle θ of the nozzle piece 13, that is,
The angle between the left and right walls of the nozzle piece 13 is 40 to 70 °
Is preferred. If this angle exceeds 70 °, the angle at which the resin coming out of the spinning port intersects with the heated gas blown out of the air slot becomes large, so that yarn breakage tends to occur. A filter (not shown) is arranged between the die body 12 and the nozzle piece 13 to remove impurities and carbides contained in the molten resin at a stage before passing through the nozzle orifices 23a and 23b. It is useful in terms of improvement and spinnability.

The resin used in the present invention is a resin which is heat-resistant and applicable to the meltblowing method and which is relatively fluid at a temperature higher than the melting point, specifically, polypropylene,
Polyethylene, 6-nylon, 6,6-nylon, 12
-Nylon, 4, 6-nylon, polyethylene terephthalate, polybutylene terephthalate, polyarylate, ethylene methyl acrylate, polycarbonate,
Polysulfone, polyether sulfone, polyether ether ketone, polyphenylene sulfide, polyfluorocarbon, polyurethane, polyolefin-based elastomer, polyester-based elastomer, polyamide-based elastomer, and the like, and these thermoplastic resins or elastomers can be used alone or in combination. To use. In some cases, a mixture of two or more of the above resins may be used. It should be noted that a higher quality mettle-blown nonwoven fabric can be obtained by combining resins having similar melt viscosity characteristics. However, when resins having significantly different melt viscosity characteristics are combined, adjustment is made by adjusting the extruder temperature and the amount of extrusion. can do.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1, 2 and 3, the tip angle of the nozzle piece 13 is set to 60 °, and the nozzle piece 13 and the Two distribution passages 25a and 25b are formed substantially symmetrically with respect to the center line A of the die body 12 over the width direction of the nozzle piece 13 and the die body 12. or,
From each distribution path 21a, 21b, a plurality of supply paths 26a, 2
6b toward the center line A and the nozzle piece 13
And are formed at regular intervals in the width direction of the die body 12. On the center line A of the nozzle piece 13, a plurality of nozzle orifices 23a (diameter 0.
5 mmΦ) and 23b (diameter 0.5 mmΦ) are provided so as to be perpendicular to the tip from the upper surface of the nozzle piece 13, and polypropylene having an intrinsic viscosity (η) of 1.1 is supplied to the nozzle orifice 23a via the supply passage 26a. 6-nylon having an intrinsic viscosity (η) of 2.4 was supplied to the nozzle orifice 23b through the supply path 26b.

The temperature of the extruder for polypropylene is 280 ° C., and the temperature of the extruder for 6-nylon is 260
At a nozzle temperature of 300 ° C. and an extrusion rate of polypropylene and 6-nylon of 0.25 g / min. Orifice, molten polypropylene and 6-nylon are discharged from each of the spinning ports 24a and 24b, and the temperature is simultaneously increased. 3
A heating gas at 20 ° C. was ejected from the air slot 20 at a pressure of 1.2 kg / cm ² . The obtained melt-blown nonwoven fabric has an average diameter of fibers of polypropylene of about 2 μm.
The average diameter of the fibers composed of m, 6-nylon was about 3 μm, and no shot was observed.

[0025]

According to the present invention, the above-mentioned structure is provided.
In the melt blow apparatus described above, the nozzle orifice is provided to penetrate vertically from the upper end of the nozzle piece to the tip, and the resin distribution structure is formed at the boundary surface between the upper surface of the nozzle piece and the lower surface of the die body. Therefore, the problems in the conventional melt blower such as mixing due to resin leakage and yarn breakage due to stagnation of the resin can be completely solved. In addition, in this melt blower, the resin distribution structure is disposed on the boundary surface between the upper surface of the nozzle piece and the lower surface of the die body, and the nozzle orifice is provided to penetrate vertically from the upper surface of the nozzle piece to the pointed end. In addition, the tip angle of the nozzle piece can be reduced, and yarn breakage due to contact with the heating gas can be reduced. In addition, in this melt blower, the nozzle orifice can be manufactured by drilling the inside of the nozzle piece vertically with a drill, and the distribution structure of the molten resin in the nozzle piece is formed between the upper surface of the nozzle piece and the lower surface of the die body. Since it is a surface processing because it is provided on the boundary surface, workability and accuracy are good, and it is highly practical in terms of cost.

According to the second aspect of the present invention, the two types of nozzle orifices for guiding the two types of resin to the spinning port are alternately provided on the center line of the nozzle piece at intervals in the width direction. In addition, the tip angle of the nozzle piece can be reduced, and yarn breakage due to contact with the heating gas can be reduced.

According to a third aspect of the present invention, there is provided a melt-blowing apparatus for distributing two kinds of different resins by a distribution path and a supply path formed in a width direction on a boundary surface between a nozzle piece upper surface and a die body lower surface. Since the distribution structure is formed by the following, the distribution structure can be processed easily and with high precision.

In the melt blow device according to the fourth aspect, by setting the tip angle of the nozzle piece to 40 to 70 °, it is possible to reliably prevent yarn breakage due to contact with the heating gas.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a nozzle piece is attached to a die body.

FIG. 2 is a perspective view showing a nozzle piece.

FIG. 3 is an enlarged cross-sectional view showing a tip of a nozzle piece.

FIG. 4 is a sectional view showing another embodiment of the molten resin distribution structure.

FIG. 5 is an enlarged sectional view showing another embodiment of the nozzle orifice.

FIG. 6 is a sectional view showing a conventional two-component nozzle piece.

FIG. 7 is a perspective view showing another example of a conventional two-component nozzle piece.

[Explanation of symbols]

 12 ... die body 13 ... nozzle piece 14 ... air lip plate 20 ... air slot 23a, 23b ... nozzle orifice 25a, 25b ... distribution path 26a, 26b ... supply path

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D04H 1/00-18/00 D01D 1/00-13/02

Claims (4)

(57) [Claims] 1. A melt blower capable of forming a nonwoven fabric made of two kinds of fibers having different properties, wherein a nozzle orifice is provided vertically penetrating from a nozzle piece upper surface to a pointed end, and a resin is provided. Wherein the distributing structure is formed at a boundary surface between the upper surface of the nozzle piece and the lower surface of the die body. 2. A nozzle orifice for guiding one resin to a spinning port and a nozzle orifice for guiding another resin to a spinning port are provided alternately in the width direction on the center line of the nozzle piece. The melt blow device according to claim 1. 3. The resin distribution is performed by a distribution path and a supply path formed in a width direction on a boundary surface between the upper surface of the nozzle piece and the lower surface of the die body. Melt blown equipment. 4. The melt-blowing apparatus according to claim 1, wherein the tip angle of the nozzle piece is 40 to 70 °.