JP3477942B2 - Composite melt blow spinneret - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a composite melt blower.
The present invention relates to a spinneret device. More specifically, the present invention relates to an eccentric sheath-core type composite melt-blow spinneret device which melt-extrudes two kinds of spinning stock solutions, composites them into an eccentric sheath-core type, and blow-spins the extruded undrawn yarn with a high-speed air stream. The ultrafine fibers obtained by such an apparatus are in the form of a web or a non-woven fabric, or processed into a molded product, a mask, a filter for microfiltration, a battery separator, a sanitary material such as a disposable diaper, a heat insulating material. Used for such purposes.

A so-called melt-blow spinning process in which a thermoplastic synthetic resin is melt-extruded from a spinneret and blown by high-speed and high-speed airflow from gaps provided on both sides of the spinneret to an extruded undrawn yarn , For example, fiber diameter 10
This is an advantageous method for producing an ultrafine fiber nonwoven fabric, since ultrafine fibers of μm or less can be obtained, and spinning and nonwoven fabric production can be continuously performed.

There are roughly two methods for melt-blow spinning. Part 1 relates to non-composite fibers, Part 2
Relates to composite fibers. For melt-blow spinning of non-composite fibers, see Industrial and Engineering Chemistry (Vol. 48, No. 8, 134).
Pp. 2-1346, 1956), the apparatus and spinning method are described. However, this document does not disclose anything about the eccentric sheath-core type composite spinning.

Regarding so-called composite melt-blow spinning, JP-A-60-99057 and JP-A-60-9905 are used.
No. 8 discloses a parallel type composite melt blower equipped with conduits for introducing two kinds of polymers from respective extruders, holes for connecting composite components connected to the conduits, spinning holes, and air-olefins. A spinning device and a spinning method are disclosed.
According to the patent, parallel type composite melt-blown ultrafine fibers can be produced by combining various different polymers such as polyester / polypropylene and nylon-6 / polypropylene. In the spinning devices disclosed in the above two cases, the temperature in the extruder, the residence time, the composition of the polymer, etc. are controlled so that the viscosity of the different polymers passing through the die becomes almost the same. According to the distribution, the composite blown fibers can be spun in parallel from each other by being extruded from the aligned olefins without severe disorder or collapse of the composite part. However, it does not disclose an eccentric sheath-core type composite spinneret device.

In Japanese Patent Laid-Open No. 2-289107, a spinneret and a spinneret provided with an elongated groove-shaped confluent resin straightening groove cut in the bottom of the spinneret in the longitudinal direction and a spinning hole drilled in the bottom are disclosed. A parallel type composite melt-blow spinning apparatus is disclosed, which comprises a separation plate for separating two kinds of stock solutions. If this device is used, a synthetic resin rectifying groove having a limited length-to-thickness ratio in the longitudinal direction of the die is machined, so that one in which the viscosity balance of the first component and the second component is slightly disturbed is spun. In comparison with the above-mentioned two known techniques, the composite ratio unevenness and the fineness unevenness are slightly improved, but the eccentric sheath-core type composite fiber cannot be spun. As described above, none of the above documents disclose an eccentric sheath-core type composite melt-blow spinneret device.

The object of the present invention is to cope with various combinations of different types of polymers, and further, there is little unevenness in fineness between single fibers,
Another object of the present invention is to provide an eccentric sheath-core type composite melt blow spinning device having a uniform composite ratio. Another object of the present invention is to provide an eccentric sheath-core type composite melt-blow spinneret device in which the sheath component or core component is deformed. Still another object is to provide a mouthpiece device having a large mouthpiece width and high productivity, and which does not damage the bottom surface of the mouthpiece or the bottom surface of the separation plate even if it is repeatedly used. An object is to provide a composite melt-blow spinneret device.

[0007]

Means for Solving the Problems The constitution of the present invention for solving the above problems is as follows.

1: An eccentric sheath-core type composite melt-blow spinneret, which is substantially T-shaped, in which a component A straightening groove is cut in the longitudinal direction from the center of the back surface, and the component A is discharged to the bottom of the groove. Separation plate 4) in which holes are bored, and B component discharge holes are respectively bored on the left and right sides of the A component rectifying groove,
An inner cavity for inserting the separation plate is formed in the back surface, a spinning hole is bored in the bottom surface of the lumen, and the central axis of the component A discharge hole of the separating plate and the central axis of the spinning hole of the spinneret plate are Not coaxially, the B component from the B component discharge hole is in a relationship of wrapping around the A component from the A component discharge hole, and further directed to the outlet of the spinning hole around the spinneret plate 5). And a gas ejection gap 16) formed by
Spinneret device.

2: An eccentric sheath-core type composite melt-blow spinneret, which is substantially T-shaped, in which a component A straightening groove is machined in the longitudinal direction from the center of the back surface and the component A is discharged to the bottom of the groove. Separation plate 4) in which holes are bored, and B component discharge holes are respectively bored on the left and right sides of the A component rectifying groove,
An inner cavity for inserting the separation plate is formed in the back surface, a spinning hole is bored in the bottom surface of the inner cavity, and B from the B component discharge hole is formed.
A means in which a component has a relationship of wrapping around the A component from the A component discharge hole, and a B component divided into left and right at any portion leading to the spinning hole of the mouth plate has different flow rates. The B component from the B component discharge hole is in a relationship of wrapping around the A component from the A component discharge hole, and the gas jet formed around the spinneret plate toward the outlet of the spinning hole. Melt-blow spinneret device with a working gap 16).

3: Undiluted solution supply plate 2) in which undiluted solution introduction grooves for guiding the spinning undiluted solutions of A and B2 types to the receiving groove of each component of the distribution plate described below are respectively cut, and the undiluted solution supply to the back surface thereof. The receiving groove for each component that receives the undiluted solution supplied from the plate is cut in the longitudinal direction, and the distribution grooves that guide the undiluted solution from the receiving groove to the distribution holes for the respective components, which will be described later, are alternated so as to cross the longitudinal direction. Has a distribution groove partition wall formed by shaving the receiving groove and the distribution groove, and the A component distribution hole for guiding the A component to the A component rectifying groove of the separation plate described later has the A component distribution hole. Perforated in the distribution groove, further B
Distribution plate 3) having B component distribution holes for guiding the components to the B component discharge holes of the separating plate, which are formed on both sides of the A component distribution hole and in the B component distribution groove and the B component receiving groove, respectively. 3. The composite melt-blow spinneret device according to 1 or 2 above.

4: The composite component introducing hole and the spinning hole are coaxially bored on the bottom surface of the inner surface of the mouth plate, and the diameter (p2) of the composite component introducing hole is larger than the diameter (p1) of the A component discharging hole, In addition, there is a narrow gap (d2) between the bottom face (k) of the separation plate and the bottom face (x) of the inner surface of the die plate, and this gap is smaller than the gap (d1) of the stock solution pressure adjusting groove. The composite melt-blow spinneret device according to any one of 1 to 3 above, which comprises a spinneret plate.

5: The composite melt blower according to any one of 1 to 4 above, which is a separation plate in which a joint control groove is formed on the bottom surface of the separation plate and between the adjacent A component discharge holes. A spinneret device.

6: Left and right flow rate means for different B components are due to a combined control groove cut on the bottom surface of the separation plate, and the groove is provided on either one of the widths of the bottom surface. 5. The composite melt-blow spinneret device according to any one of 2 to 4 above, which is machined only.

7: Left and right flow means for different B components are provided by a combined control groove formed on the bottom surface of the separation plate, and the groove is formed on both sides of the width of the bottom surface. The composite melt-blow spinneret device according to any one of 2 to 4 above, wherein the size of the groove is cut such that the size of the groove is different on both sides of the bottom surface.

8: Left and right flow means for different B components are provided by a combined control groove formed on the bottom surface of the separation plate, and the groove is formed on both sides of the width of the bottom surface. The composite melt-blow spinneret device according to any one of 2 to 4, wherein the groove is asymmetrically cut on both sides of the bottom surface.

9: Left and right flow means for different B components are provided, and a B component discharge hole formed on the back surface of the separation plate is A
5. The composite melt-blow spinneret device according to any one of 2 to 4 above, which is a separating plate having a different diameter or a different number of holes on both sides of the component rectifying groove.

10: Distributor plates having different B component flow rates divided into left and right are different in diameter between the B component distribution holes perforated in the distribution plate sandwiching the A component distribution hole or the number of holes is different. 5. The composite melt blower according to any one of 2 to 4 above
Spinneret device.

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are schematic front sectional views of the composite melt-blowing apparatus of the present invention, and FIG. 6 is a front sectional view of the lower part of the die plate of FIG. The spinneret 1 of the present invention comprises a separation plate 4 for separating the stock solutions A and B supplied from the upper part of the separation plate 4 into a core stock solution A and left and right sheath component stock solutions B, and transferring them to the spinning hole side, and a back surface of the spinneret plate. An inner cavity 22 for inserting the separation plate is cut in and a spinneret hole 15 is bored on the bottom surface of the inner cavity, and a pair of gas gap adjusting plates 6 provided outside the mouthpiece plate 5. It mainly consists of and. Moreover, the separation plate and the base plate are
The central axis of the A component discharge hole and the central axis of the spinning hole are arranged so as not to be coaxial (FIG. 1).

Further, in another spinneret of the present invention, together with the separation plate, the spinneret plate, the gas gap adjusting plate, etc., further, the B component divided into the right and left at any part leading to the spinning hole of the spinneret plate is provided with different flow rates. (Fig. 2).

Of course, the die of the present invention is provided with a separating plate, a die plate, and the like, and an upper member for guiding each of the stock solutions. That is, the stock solution introduction grooves (7) to which the spinning stock solutions A and B are respectively supplied.
The stock solution supply plate 2 in which a) and (7b) are respectively cut and a distribution plate described later are provided on the upstream side of the separation plate. An article including the upper member will be described below. The A component introducing groove (7a) and the B component introducing groove (7b) are respectively cut in the stock solution supply plate 2 in a groove shape, and the discharge port thereof is cut in a wide angle shape, and the distribution plate 3 is formed.
Of the respective components are substantially matched with the receiving groove 19 and 21. The outlet of the B component introducing groove (7b) has its central axis opened at a position apart from the right B component distributing hole (23b2) formed in the distribution plate 3 described later. This undiluted solution supply plate may be an integral one, but in the case of this example, it is divided into three parts, a left member, a right member, and a central member, which are fixed with bolts (FIG. 2).

The distribution plate 3 is provided with an A component receiving groove 19 and a B component receiving groove 21 on the left and right sides of its rear surface, respectively, in the longitudinal direction and in the front-back direction shown in FIG. Further, the distribution plate of the present invention is designed to distribute the B component to two places on the left and right. The width of the receiving groove is B component receiving groove width (w2)> A
It is cut so as to have the groove width (w1) of the component receiving portion. With such a structure, the dwell time until the A component, which is to be the core component, is transferred to the A component distribution hole 23a described later in the groove 19, and the B component in the groove 21 is the B component distribution hole described later. It is possible to adjust the retention time until the transfer to the well in a well-balanced manner, and it is possible to prevent abnormal thermal decomposition or the like due to abnormal balance of the retention time in the groove for only one of the components. An A component distribution groove (20a) is cut and formed in the rear surface so that one end thereof is opened in the A component receiving groove 19 in the left-right direction. Further, the B component distribution groove (20b) is cut in the left and right direction so that one end thereof is opened to the B component receiving groove 21. The lengths (11, 12) of the distribution groove for each component are substantially the same. The distribution grooves for the respective components are alternately cut with the distribution groove partition walls 24 separated (FIGS. 2 and 3).

Further, in the inner part of the distribution groove of each component, A
The component distribution hole (23a) and the B component distribution hole (23b1) are perforated. A large number of the component A distribution holes are vertically formed in the substantially central portion of the distribution plate. A B component distribution hole (23b2) for distributing the B component to the B component receiving groove (9b2) of the separating plate is formed in the B component receiving groove 21 of the distributing plate. In the embodiment of the present invention, a large number of B component distribution holes (23b1, 23b2) are obliquely formed, and the B component distribution holes (23b1, 23b2) are opened in the receiving groove for each component of the separation plate described later. The diameters of the distribution holes may be the same on the left and right, or may be different as shown in FIG. The B component distribution hole (23b2) has a stock solution introduction side (rear surface) formed by being shifted to the left side from the central axis of the discharge port of the B component stock solution introduction groove (7b). Further, the B component distribution holes on the left and right sides are obliquely punched in a substantially (c) shape with the A component distribution hole sandwiched therebetween, so that the B component can be discharged to the separation plate described later in a well-balanced manner (FIGS. 2 and 3).

When the means for making the B component separated into right and left parts have different flow rates is provided, the distribution holes (23b1) and (23b1)
b2) by changing the diameter (Fig. 2, 3, 4), or by punching holes with the same distribution hole diameter but different numbers of holes on the left and right, etc. , The core component is eccentric. Further, as a means for making the B component divided into right and left different flow rates, there is a means such as filling one of the left and right holes, or cutting one of them into a groove shape.

On the ventral surface of the distribution plate 3, an A component receiving groove (25a) and a B component receiving groove (25b1, 25b2) are cut. Further, a partition wall 28 is formed. By providing the groove, each stock solution can be uniformly distributed in the longitudinal direction (Fig. 4). However, this groove is not necessary.

The separation plate 4 is cut into a substantially T shape. The separating plate is mounted so as to be inserted into the inner cavity 22 of the base plate. The separating plate has an A component receiving groove (9
a) and the B component receiving groove (9b1,
9b2) is cut in the longitudinal direction. In the embodiment of the present invention, the receiving groove also serves as a support material for the filter 10 (FIGS. 1 and 2). A large number of B component discharge holes (8b1, 8b2) are formed on the bottom surface of the B component receiving groove. In the present invention, a groove may be formed instead of the hole. Further, an A component rectifying groove (8a) for rectifying and transferring the A component from the A component stock solution receiving groove on the back surface to the bottom surface is cut in the longitudinal direction. A large number of A component discharge holes 17 are formed on the bottom surface of the groove (8a), the same number as the spinning holes described later (FIG. 1). Further, the separating plate is arranged such that the central axis of the A component discharge hole 17 is not coaxial with the central axis of the spinning hole 15 of the die plate 4 described later. The central axis of the component A discharge hole 17 of this separating plate and the base plate 4
The deviation of the central axis of the spinning hole 15 is set by the set pin 30.

The width of the groove (8a) is about 2 to 30 mm, preferably about 3 to 20 mm. When the width is 2 mm or less, the transport speed of the stock solution is too fast, and uneven viscosity and uneven flow rate are likely to occur in the longitudinal direction. On the other hand, if the width exceeds 30 mm, the transport speed of the undiluted solution may be too slow, which may cause abnormal thermal decomposition or carbides.

As shown in FIG. 1, the base plate has a shape of an inverted isosceles triangle as it traverses its longitudinal direction. On the back surface of the mouth plate 5, an inner cavity 22 is cut in the longitudinal direction, that is, the front-back direction in FIG. Further, on the bottom surface (x) of the inner cavity, a composite component introducing hole 14 and a spinning hole 15 are coaxially formed in the lower part of the hole. Further, the central axis of each of the holes is arranged not coaxial with the central axis of the A component discharge hole 17 of the separation plate (FIG. 1).

Further, as shown in FIG. 2, in the case where the upper path to the spinning hole perforated in the spinneret plate, each member, and the like are provided with means for making the B component divided into left and right different flow rates,
The central axis of the A component discharge hole 17 of the separating plate and the central axis of the spinning hole 15 of the spinneret plate can be arranged coaxially or can be arranged not coaxially.

In the present example, the separating plate and the mouth plate are formed by inserting the substantially T-shaped separating plate 4) into the bored hole 22 of the mouth plate 5), and separating the left and right sides of the separating plate and the mouth plate. B component receiving groove 1
3), the B component stock solution pressure adjusting groove 12) is formed, and the bottom surface (k) of the separation plate and the inner bottom surface (x) of the mouth plate are fixed with a bolt (11) with a narrow gap (d2). (Figs. 1 and 2). However, when the bonding control groove, the composite component introducing hole, the composite component introducing groove, and the like described later satisfy a specific relationship, they may be in close contact with each other. B component receiving groove 1
3), the B component stock solution pressure adjusting groove 12) is formed, and by forming a narrow gap (d2) between the bottom surface (k) of the separation plate and the inner bottom surface (x) of the mouth plate, B of the separation plate is formed. The B component from the component discharge hole has a relationship of wrapping around the A component which is the core from the A component discharge hole.

The spinning device of the present invention is provided with a gas gap adjusting plate 6 which is divided into left and right parts on the lower part of the die plate so as to form a gas ejection gap 16 with a lower side wall of the die plate (FIG. 1). The gas gap adjusting plate 6 may be divided into a left member and a right member as in the present embodiment, or may be an integrated member cut into a substantially V shape.

In the composite melt-blow spinneret device of the present invention, the bottom surface (x) of the inner cavity of the spinneret plate and the bottom surface (k) of the separation plate have a narrow gap (d2) as shown in FIG. It is arranged. The (d2) may be about 0.1-5 mm. The gap is compounded so that the sheath component B is wrapped in the core component A. Further, damages due to contact between the separation plate and the spinneret plate can be prevented when assembling or disassembling each member of the spinning device.
If the d2 is less than about 0.1 mm, the same damage as described above may occur due to thermal expansion of each member during spinning or heating and washing of the spinneret, which is not preferable. If it exceeds 5 mm, the component A discharged from the hole 17 may be mixed with the component B, so that any single fiber cannot have a uniform eccentric sheath-core type composite fiber with a uniform eccentricity and no unevenness in fineness ( 2,
6). It is also easy to make polymer balls.

In the mouthpiece device of the present invention, the pressure adjusting grooves 12 may have the same width (d1) on the left and right sides (FIG. 2) or may be different (FIG. 6). The width (d1) is about 0.5-8m
m, preferably about 1-10 mm. The d1 is 0.5
If it is less than mm, the transport speed of the undiluted solution is too fast, and uneven viscosity and uneven flow rate are likely to occur in the longitudinal direction. If the width exceeds 10 mm, the transport speed of the stock solution is too slow, and if a resin having relatively poor heat resistance is used, abnormal thermal decomposition,
Carbides may be generated, which may cause clogging of the spinning holes and foaming. In addition, uneven composite ratio, uneven fineness, etc. occur, and uniform composite fibers cannot be spun.

In the present invention, the connecting control groove can be formed in the separating plate. The connecting control groove is cut near the bottom surface of the separating plate. FIG. 5 is a front sectional view of a lower portion of the separation plate for explaining the combined control groove. 7 is an enlarged side view of the lower part of the separation plate, and FIG. 8 is a schematic plan view of the bottom surface of the separation plate.

The connecting control groove is shown in FIGS.
-2, as shown in FIG. 8-5, m1, m2, m3, etc. may be cut on both sides sandwiching the separation plate and symmetrically with respect to the bottom surface. In this case, if the central axis of the A component discharge hole of the separation plate and the central axis of the spinning hole of the spinneret plate are not coaxial, or there is a means for making the B component divided into left and right different flow rates, etc. It is possible to obtain an eccentric sheath-core type composite fiber having uniform eccentricity between fibers and less unevenness in fineness. This is because, as shown in FIG. 8-5, the B component flows in one A component discharge hole (17) so as to wrap the A component obliquely from the left and right sides thereof, that is, in the direction of the arrow. Further, in the present invention, this groove may be formed so as to completely traverse the bottom surface of the separating plate as shown in FIG. 8-6.

Further, in the present invention, the function can be imparted to another coupling control groove as a means for making the right and left B components have different flow rates. For example, FIGS.
As shown in FIG. 4, the connection control groove (27) is cut on only one side of its bottom surface (FIGS. 5-2 and 5-).
3,7-1,8-1,8-2), its width (m1), side wall length (m2), bottom face length (m3), etc. (FIG. 8-4) and the like can be illustrated. When there is such a means for making the B component divided into the right and left parts different in flow rate, the B component separated into the left and right parts regardless of whether the central axis of the A component discharge hole and the central axis of the spinning hole are coaxial or not coaxial. When the flow rates are different from each other, a composite fiber in which the A component is eccentric can be obtained. For example, when the combined control groove as shown in FIG. 8-4 is cut, the composite fiber as shown in FIG. 9-5 in which the core component is deformed into a concave shape (29) is obtained. In addition, when the groove (27) as shown in FIGS. 8-1 and 8-2 is cut, the selection of both components results in FIGS. 9-2, -3, -4, -5,
A composite fiber according to any one of -6 is obtained.

The width of the connecting control groove (m
1) is about 0.1-10 mm, preferably about 0.2-7 m
m, more preferably about 0.3-5 mm. The side wall length (m2) is about 0.1 to 100 mm, preferably about 0.2 to 90 mm, more preferably about 0.3 to 60 mm.
Is. The length (m3) of the bottom surface is about 0.1 to the width (mm) of the bottom surface, preferably about 0.2 to 50 mm, more preferably about 0.2 to 40 mm. When the above (m1, m2, m3) and the like are less than about 0.1 mm, there is little effect of making the B component separated into left and right different flow rates. If (m1) exceeds 10 mm, the density of spinning holes cannot be increased. Therefore, the productivity of the fiber is poor. Further, (m2) has a function of preventing the B component from being disturbed in the front-back direction in FIG. 1 in the pressure adjusting groove 12 of the inner cavity 22 when the length thereof is large, and therefore does not impair the object of the present invention. As long as it is, it may substantially exceed 100 mm. However, about 100 mm is sufficient in terms of workability and processing cost of the groove.

Further, in the present invention, other means can be used as means for making the B component separated into left and right parts different flow rates. For example, a separation plate in which the bottom surface of the separation plate is cut obliquely, or a separation plate in which only one of the bottom surfaces of the separation plate is chamfered round can be arranged. Also, of the left and right distribution holes, a distribution plate having a large hole on the right side (23b2) may be arranged (FIGS. 2 and 3), or the B component discharge holes (8b1, 8b2) formed on the back surface of the separation plate. There is a means (not shown) such that either the right or left side is greatly perforated, or the left or right side is filled with a plug or the like. As another means, a block body that changes the volume of the stock solution receiving portion groove 13 on either side may be arranged by screwing or the like. Also, a core component gear pump, two sheath component gear pumps on the left and right may be arranged, and a means for changing the discharge amount of the sheath component gear pump to the left and right may be provided.

In the present invention, the bottom surface of the separation plate and the bottom surface of the die plate may be in close contact with each other. In this case, the separating plate is cut from above and below so that the connecting control groove on the bottom surface crosses the A component discharge hole 17, and the bottom surface between adjacent holes 17 forms a convex portion, and the convex portion is formed. May be placed in close contact with the bottom surface of the base plate (not shown). Further, any of those in which the diameter (p2) of the composite component introducing hole perforated in the die plate is larger than the width (p3) of the bottom surface of the separation plate may be used.

In the above configuration, the stock solutions of the components A and B extruded from the two extruders reach the stock solution receiving portions of the stock solution supply plate 2 by the two gear pumps (not shown). , And is discharged to the receiving groove (19, 21) for each component of the distribution plate 3 through each of the stock solution introducing grooves (7a, 7b). The A component stock solution passes through the A component distribution groove (20a) and the distribution hole (23a) of the distribution plate, and then the receiving groove (9a) of the separation plate 4.
Is discharged to. The B component stock solution is divided into right and left, one of which passes through the B component distribution hole (23b1) and is discharged to the receiving groove (9b1), and the other of which is the B component distribution groove (20b) and B component distribution hole (23b2) of the separation plate. ) And is discharged to the receiving groove (9b2). The undiluted solution transferred to the back surface of the separation plate has the A component discharged through the A component discharge hole 17 through the A component rectifying groove (8a). In addition, the B component is B that is drilled on the left and right of the groove (8a).
It is discharged from the component discharge holes (8b1, 8b2) and discharged to the upper space formed by the separation plate and the die plate, that is, the B component receiving groove 13. The B component passes through a space formed by the outer wall of the lower part of the separation plate and the side wall of the inner cavity of the mouth plate, that is, the B component stock solution pressure adjusting groove 12, and is transferred to a narrower gap (d2). The A component discharged from the A component discharge hole is wrapped in the B component in the narrow gap and the composite component introducing hole 14 of the die plate, and
The components are eccentric, and the eccentric sheath-core type composite fiber is spun from the spinning hole 15 and spun.

The high-temperature and high-pressure gas is introduced into the undrawn yarn spun from the spinning hole from the gas introduction ports 18 on the left and right of the die plate, and the gas is ejected from the gas ejection gap 16 and the ejected gas draws the drawn fine fibers. At the same time, the fibers are fibrillated, and when the gas pressure is sufficiently high, they are cut and collected as an ultrafine fiber web by a collecting device arranged below the die. As the jet gas, an inert gas such as air or nitrogen gas is used, the temperature is about 80 to 500 ° C., and the pressure is about 0.3 to 6 kg / cm.
^{Is 2} .

Using the device of the present invention, polyethylene, polypropylene, polyethylene terephthalate, 6
-Nylon, 6,6-nylon, 2 to 4 terpolymer of propylene and other α-olefin, polybutylene terephthalate, polyphenylene sulfide, polycarbonate
, Polyurethane, polyvinylidene fluoride, polyester elastomer, polyamide elastomer, polyaryle
Composite spinning can be performed by combining various resins such as G. Further, the eccentric sheath-core type composite fiber using the low melting point resin as the sheath component and the high melting point resin as the core component causes thermal fusion between the fibers by heating, so that a highly strong nonwoven fabric can be obtained. Further, during heating, a bulky nonwoven fabric can be obtained due to heat shrinkage of any of the components of the composite. When the cross-sectional view of the ultrafine conjugate fiber thus obtained is schematically shown, the eccentric sheath-core conjugate fiber is as shown in FIGS. 9-2 to 9-6. FIG. 9-1 is a cross-sectional view of a sheath-core type composite fiber having extremely little eccentricity. The fibers are used as they are, or mixed with other fibers, to develop crimps by heating, to be heat-sealed, in the form of webs or in the form of non-woven fabrics for various purposes.

[0042]

EFFECT OF THE INVENTION The apparatus of the present invention is capable of spinning eccentric sheath-core type composite melt blow fibers of ultrafine fibers. The device of the present invention is arranged such that the sheath component and the core component are eccentrically arranged, or a specific means for causing the sheath component to be divided into left and right portions on both sides thereof to have different flow rates, or the sheath component and the core component. , Due to a narrow gap arranged directly above the spinning hole, a composite component introduction hole, etc., the core component is eccentric, or with eccentricity, either or both of the components are deformed, and the fineness unevenness is small, The ultrafine fibers can be spun. When this device is used, even if there is a large difference in the viscosity between the two components, or if there is a slight variation in the viscosity of the stock solution or spinning temperature irregularity in the inner cavity of the spinneret, the composite ratio and fineness The composite fiber can be spun uniformly without unevenness. Further, since the device of the present invention has less unevenness of fineness, the width of the die can be increased and the productivity can be improved. In addition, when the separation plate and the base plate are arranged with a narrow gap therebetween, in addition to the above effects, neither the base plate nor the lower part of the separation plate is damaged and can be used for a long period of time.

[Brief description of drawings]

FIG. 1 is a schematic front sectional view of a composite melt-blowing apparatus according to the present invention.

FIG. 2 is a schematic front sectional view of a composite melt-blow spinning device of the present invention.

FIG. 3 is a schematic plan view of the rear surface of the distribution plate.

FIG. 4 is a schematic plan view of a distribution plate ventral surface.

FIG. 5 is a front sectional view of the lower part of the separation plate.

FIG. 6 is a schematic sectional view of the lower part of the die plate (front).

FIG. 7 is a front sectional view of the lower part of the separation plate.

FIG. 8 is a schematic plan view of the bottom surface of the separation plate.

FIG. 9 is a sectional view of a sheath-core type composite fiber.

[Explanation of symbols]

1: Composite melt-blow spinneret device 2: Stock solution supply plate 3: Distribution plate 4: Separation plate 5: Base plate 6: Gas gap adjusting plate 7a: A component undiluted solution introduction groove 7b: B component stock solution introduction groove 8a: A component rectifying groove 8b1: B component discharge hole 8b2: B component discharge hole 9a: A component receiving groove on the back of the separating plate 9b1: B component receiving groove on the back of the separating plate 9b2: B component receiving groove on the back of the separating plate 10: Filter 11: Bolt 12: Undiluted solution pressure adjusting groove 13: Groove of component B stock solution receiving part groove 14: Complex component introduction hole 15: Spinning hole 16: Gap for gas ejection 17: A component discharge hole 18: Gas inlet 19: A component receiving groove on the rear surface of the distribution plate 20a: A component distribution groove on the rear surface of the distribution plate 20b: B component distribution groove on the rear surface of the distribution plate 21: B component receiving groove on the rear surface of the distribution plate 22: lumen 23a: A component distribution hole 23b1: B component distribution hole 23b2: B component distribution hole 24: Distribution groove partition wall 25a: A component receiving groove on the ventral surface of the distribution plate 25b1: B component receiving groove on the distribution plate ventral surface 25b2: B component receiving groove on the distribution plate ventral surface 26: Bolt hole 27: Combined control groove 28: Partition wall of distribution plate ventral surface 29: Core component deformed into a concave shape 30: Pin k: bottom of separator x: bottom surface of the inner cavity of the base plate w1: Width of A component receiving groove on the back of distribution plate w2: Width of B component receiving groove on the back of distribution plate l1: Length of A component distribution groove on the back of distribution plate l2: Length of B component distribution groove on the rear surface of distribution plate d1: Width of stock solution pressure adjustment groove d2: Narrow gap p1: Diameter of A component discharge hole p2: diameter of complex component introduction hole p3: width of the bottom of the separator m1: Width of combined control groove m2: Side wall length of combined control groove m3: Bottom length of combined control groove

Claims (9)

(57) [Claims] 1. An eccentric-sheath core type composite melt-blow spinneret, which is substantially T-shaped, in which a component A straightening groove is cut in the longitudinal direction from the center of the back surface, and the component A is discharged to the bottom of the groove. Separation plate 4) in which holes are drilled, and B component discharge holes are respectively drilled on the left and right sides of the A component rectifying groove, and an inner cavity for inserting the separation plate is formed in the rear surface, and A spinning hole is bored on the bottom surface of the cavity, the central axis of the A component discharge hole of the separation plate and the central axis of the spinning hole of the spinneret plate are not coaxial, and the B component from the B component discharge hole is the A component discharge hole. Melt-spinning, which comprises a spinneret 5) which is in a relationship to wrap around the A component from No. 3), and a gas ejection gap 16) which is formed around the spinneret toward the outlet of the spinning hole. Mouthpiece device. 2. An eccentric sheath-core type composite melt-blow spinneret, which is substantially T-shaped, in which a component A straightening groove is machined in the longitudinal direction from the center of the back surface, and the component A is discharged to the bottom of the groove. A separation plate 4) in which holes are drilled and further B component discharge holes are formed on both sides of the A component rectifying groove, and an inner cavity for inserting the separation plate is formed in the rear surface. Any of the spinneret 5) in which a spinning hole is formed on the bottom surface, and the B component from the B component discharge hole wraps around the A component from the A component discharge hole and the spinning hole of the spinneret. A composite melt blower provided with a means for making the B component divided into right and left parts at different positions different flow rates, and further with a gas ejection gap 16) formed around the spinneret plate toward the outlet of the spinning hole. A spinneret device. 3. An undiluted solution supply plate 2) in which undiluted solution introduction grooves for introducing the spinning undiluted solutions of the A and B types into the receiving grooves of the respective components of the distribution plate described later are respectively cut, and the undiluted solution supply on the back surface thereof. The receiving groove for each component that receives the undiluted solution supplied from the plate is cut in the longitudinal direction, and the distribution grooves that guide the undiluted solution from the receiving groove to the distribution holes for the respective components, which will be described later, are alternated so as to cross the longitudinal direction. Has a distribution groove partition wall formed by shaving the receiving groove and the distribution groove, and the A component distribution hole for guiding the A component to the A component rectifying groove of the separation plate described later has the A component distribution hole. B component distribution holes, which are drilled in the distribution groove and which guide the B component to the B component discharge holes of the separating plate described later, are provided on both sides of the A component distribution hole and in the B component distribution groove and the B component receiving groove, respectively. Perforated distributor plate 3). The composite melt-blow spinneret device according to item 1. 4. A composite component introducing hole and a spinning hole are coaxially bored on the bottom surface of the inner surface of the die plate, and the diameter (p2) of the composite component introducing hole is larger than the diameter (p1) of the A component discharging hole, In addition, there is a narrow gap (d2) between the bottom face (k) of the separation plate and the bottom face (x) of the inner surface of the die plate, and this gap is smaller than the gap (d1) of the stock solution pressure adjusting groove. A composite melt-blow spinneret device according to any one of claims 1 to 3, comprising a spinneret plate. 5. The composite plate according to any one of claims 1 to 4, wherein a combined control groove is formed on the bottom surface of the separation plate and between the adjacent A component discharge holes. Melt-blow spinneret device. 6. The left and right flow rate means for different B components are formed by a combined control groove cut on the bottom surface of the separation plate, and the groove is provided on either one of the widths of the bottom surface. The composite melt-blow spinneret device according to any one of claims 2 to 4, which has been cut only. 7. The left and right flow rate means for different B components are formed by connecting control grooves formed on the bottom surface of the separation plate, and the grooves are formed on both sides of the width of the bottom surface. The composite melt-blow spinneret device according to any one of claims 2 to 4, wherein the size of the groove is cut differently on both sides of the bottom surface. 8. Separation in which right and left flow rate means for different B components have different diameters or different numbers in both of the B component discharge holes formed on the back surface of the separation plate sandwiching the A component rectifying groove. The composite melt-blow spinneret device according to any one of claims 2 to 4, which is a plate. 9. A distribution plate in which right and left flow rate means for different B components are different in diameter between the B component distribution holes formed in the distribution plate sandwiching the A component distribution hole or different in the number of holes. The composite melt-blow spinneret device according to any one of claims 2 to 4.