JP4063086B2 - Spin pack for rectangular composite spinning - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a yarn group melt-spun from a rectangular base of a two-component composite that is long in the machine width direction is sucked with a rectangular air soccer ball corresponding to the rectangular base width and stretched to a predetermined magnification. A rectangular two-component used in an apparatus for producing a synthetic non-woven fabric composed of two components by being sucked onto a collecting conveyor disposed in a downward direction together with air supplied to soccer and air accompanying the yarn. The present invention relates to an improvement of a spin pack for composite fiber spinning.
[0002]
[Prior art]
Conventionally, a spunbond method using a rectangular die is known as one of methods for producing a nonwoven fabric composed of two-component composite fibers. This method uses a two-component composite rectangular base that is long in the machine width direction and an air soccer ball corresponding to the base width to stretch the spun yarn group at a predetermined ratio and then to the trap disposed below. The two-component composite fiber nonwoven fabric having a predetermined width and thickness is manufactured by sucking and depositing on a collecting conveyor. In the spinneret portion of the nonwoven fabric production apparatus, the two-component polymer inflow holes and the polymer filter introduced into the spinneret portion are arranged in the front-rear direction of the composite spinneret (Patent Document 1). .
[0003]
[Patent Document 1]
Japanese Patent No. 2656823 Specification
[Problems to be solved by the invention]
However, in recent years, the demand from users has been increasing for thin sheets with fine and uniform fineness, and thin objects with high pulling and tensile strength. As a result, spun fibers are melted at several tens of degrees Celsius. For example, for the purpose of improving the adhesion between fibers at the time of forming a sheet, a copolymerized PET having a melting point of several tens of degrees Celsius lower than the normal PET at the core is used for the sheath at a weight ratio of 10 for example. Polyamide with a melting point of several tens of degrees Celsius with a melting point of about -30% used for the purpose of facilitating division by post-processing such as a water-jet punch after use of a fiber having a core-sheath shape or a sheet molding. Dividing composite fiber sheets made of polymers have been produced.
[0005]
Here, in the case of a spin pack for composite fiber spinning using two types of polymers having different melting points as described above, the heating and holding temperature of the spin pack part is naturally a temperature at which the polymer having the higher melting point flows sufficiently. Must be set. However, in the polymer melting part, it is necessary to suppress the thermal deterioration of the polymer as much as possible, and the melting temperature of the low melting point polymer is several tens of degrees Celsius with respect to the high melting point polymer side from the viewpoint of the discharge stability of the extruder usually used as a melting means. It is set low and flows into the spin pack through the polymer flow path.
[0006]
In the rectangular die apparatus in which the two-component polymer inlet and polymer filter introduced into the spinneret described above are arranged in the front-rear direction of the composite spinneret, there are two types having a melting temperature difference of several tens of degrees Celsius. Due to the difference in the amount of heat brought in due to the inflow of the polymer, a temperature difference occurs in the front-rear direction of the rectangular die. For this reason, a difference in melt viscosity occurs between the two types of polymers inside and outside the die. That is, it becomes a discharge resistance difference in the discharge holes that are opened in the base surface, and causes a fineness difference of several tens percent in the front-back direction. In addition, due to thermal degradation of the low melting point polymer of the fiber spun from the side with a large discharge amount before and after the die, that is, the higher temperature side, the monomer is likely to precipitate, and the monomer adhesion and contamination on the die surface increase. As a result, spun yarn breakage was caused and the correction period of the die was shortened.
[0007]
As a result, there was a problem that the uniformity of the non-woven fabric having a fineness of 1 dtex or less was deteriorated, and the productivity was deteriorated due to an increase in the number of production suspensions due to the shortening of the die correction period.
[0008]
In view of the background of the prior art, the present invention is a rectangular composite spinning spin pack capable of continuously producing a nonwoven fabric excellent in uniformity without any problem even with fineness of 1 dtex or less, without spun yarn. Is intended to provide.
[0009]
[Means for Solving the Problems]
The present invention employs the following means in order to solve such problems. In other words, the spin pack for rectangular composite spinning of the present invention comprises a yarn group melt-spun from a two-component composite rectangular die having a long shape in the machine width direction and discharge holes in the entire surface in the machine width direction and the length direction . A spinning device for producing a synthetic fiber nonwoven fabric composed of two components by sucking air with a rectangular air soccer ball corresponding to the width of the rectangular base and sucking and collecting it together with air on a collecting conveyor disposed below. A rectangular spin pack to be used, in which a plurality of protrusions having a polymer introduction hole that forms a pair of two components on a side surface in the width direction of a rectangular die block, and a receiving member for a pressing rod on an opposite side surface corresponding to the side surface. a protrusion having a seat provided, large polymers of the introduced polymer composition ratio within the spin pack, uniformly, to form a polymer flow path for dispensed multiple times in the machine width direction of the elongated and Rimmer component ratio small polymer, a polymer flow passage in order to be evenly distributed in the longitudinal direction forming the machine width direction perpendicular flow path communicating with the annular so as to surround the discharge hole group of large polymer in the polymer composition ratio And is constituted.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a spin pack for rectangular composite spinning according to the present invention will be described with reference to the drawings.
[0011]
FIG. 1 is a schematic perspective view showing the structure of a rectangular composite spinning spin pack according to the present invention, and FIG. 2 is a diagram for explaining the schematic structure of the rectangular composite spinning spin pack according to the present invention. It is sectional drawing in AA.
[0012]
FIG. 3 is a cross-sectional view showing details of a main part of the rectangular composite spinning spin pack according to the present invention, and FIG. 4 is a schematic structure in the machine width direction of the rectangular composite spinning spin pack according to the present invention. It is a polymer flow path explanatory drawing by the side with a high polymer composition ratio. FIG. 5 is an explanatory diagram of a polymer flow path on the side having a low polymer composition ratio.
[0013]
FIG. 6 shows a procedure for arranging the polymer filter of the spin pack for rectangular composite spinning according to the present invention. This figure is an explanatory diagram of the procedure for arranging the polymer filter on the side having a higher polymer composition ratio. FIG. 7 is an explanatory view of the arrangement of the polymer filter on the side having a low polymer composition ratio.
[0014]
In FIGS. 1 and 2, (1) is a rectangular die block, and a plurality of protrusions (2) having a polymer inflow port and a seat of a pressing bar (not shown) on the opposite side corresponding to the side surface The die block portion is attached to a spin block (not shown) for heating and keeping warm by the projection portion (3) having the above. (4) is a flow dividing plate constituting a rectangular base part, (5) is a plate I, (6) is a plate II, (7) is a plate III, and the above-mentioned die is fixed by a fastening bolt (not shown). It is configured to be attached to the block.
[0015]
Next, the flow of the polymer will be described in detail with reference to FIGS. 2, 3, 4, 5, 6 and 7. The polymer that has flowed in from the polymer inlet (8) on the side of the larger composition ratio passes through the flow path (9) distributed in the machine width direction, and the dispersion gap (10) provided on the lower surface of the flow dividing plate (4). In the plate I (5), the entire surface of the inflow holes (11) is uniformly diffused, and after passing through the polymer filter (12) plate II (6) composed of a wire mesh, the plate III (7) It is spun from the discharge hole (13).
[0016]
On the other hand, the polymer that has flowed in from the polymer inlet (14) on the side with the smaller composition ratio surrounds the machine width direction and the polymer flow path on the side with the larger composition ratio and the polymer filter (12), etc. A polymer filter composed of a wire mesh or the like, which is uniformly diffused over the entire surface of the porous (16) group opened in the flow dividing plate (4) by the flow path (15) and the dispersion gap (10 ') distributed uniformly. 12 ′), through a polymer flow channel (16) having a large number of holes, and through a flow channel (17) communicated in an annular shape so as to surround the discharge hole (11) group described above, and further to the plate I (5). It flows into the polymer pool portion A (19) through the opened inlet (18). (20) is a polymer inlet, flows into the polymer pool part B (21), flows so as to surround from the outer peripheral part of the polymer on the side having a large component ratio, and a yarn having a so-called core-sheath cross section, It is spun from the discharge port (13).
[0017]
That is, in the spin pack of the present invention, the polymer having the smaller component ratio and the polymer having the larger component ratio merge immediately before the discharge port (13) and are combined into a core-sheath type. Since the spinning is performed without being affected by this, spinning can be performed without any trouble.
[0018]
【The invention's effect】
According to the spin pack of the present invention, even in the case of a composite yarn using polymers having different polymer composition ratios and different melting temperatures, temperature spots in the front-rear direction of the die caused by the difference in heat brought in by the polymer are eliminated. Since the fineness unevenness of the yarn spun from the die surface is eliminated, it is possible to stably spin a thin yarn of 1 decitex or less, and thus produce a desired uniform nonwoven fabric. It can be provided with good quality.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing the structure of a rectangular composite spinning spin pack according to the present invention.
FIG. 2 is a view for explaining the schematic structure of a rectangular composite spinning spin pack according to the present invention, and is a cross-sectional view taken along the line AA of FIG. 1;
FIG. 3 is a cross-sectional view showing details of a main part of a rectangular composite spinning spin pack according to the present invention.
FIG. 4 is an explanatory diagram of a polymer flow path on the side with a higher polymer composition ratio of a rectangular composite spinning spin pack according to the present invention.
FIG. 5 is an explanatory diagram of the polymer flow path on the side of the low polymer composition ratio of the rectangular composite spinning spin pack according to the present invention.
FIG. 6 is an explanatory view of the arrangement of a polymer filter on the side with a higher polymer composition ratio of the spin pack for rectangular composite spinning according to the present invention.
FIG. 7 is an explanatory view of the arrangement of a polymer filter on the side of the low polymer composition ratio of the rectangular composite spinning spin pack according to the present invention.
[Explanation of symbols]
1: Rectangular die block 2: Protrusion portion having polymer inlet 3: Protrusion portion having pressing bar seat 4: Dividing plate 5: Plate I
6: Plate II
7: Plate III
8: Polymer inlet on the side with a larger component ratio 9: Flow path distributed in the machine width direction
10,10 ': Dispersion gap
11: Inlet hole
12,12 ': Polymer filter
13: Discharge hole
14: Polymer inlet on the side with a small component ratio
15: Flow path
16: Porous
17: Communicating flow path
18: Inlet
19: Polymer pool part A
20: Polymer inlet
21: Polymer pool part B

Claims (3)

A yarn group melt-spun from a two-component composite rectangular die having a long shape in the machine width direction and discharge holes in the entire machine width direction and length direction is formed with a rectangular air soccer ball corresponding to the width of the rectangular die. A rectangular spin pack used in a spinning device for producing a synthetic fiber nonwoven fabric composed of two components by sucking air and sucking and collecting on air on a collecting conveyor disposed in the lower part of the rectangular die block. Protrusions at multiple locations with a polymer introduction hole that forms a pair of two components on the side surface in the width direction and projections with a receiving seat for a pressing bar on the opposite side surface corresponding to the side surface are provided and introduced into the spin pack polymer composition ratio larger polymer is evenly machine width direction of the elongated, to form a polymer flow path for dispensed multiple times, and a small polymer having a polymer composition ratio, a machine width direction Rectangle, wherein the polymer passage for is evenly distributed in the longitudinal direction at an angle, that is a flow path that communicates with the annular and is configured so as to surround the discharge hole group of large polymer in the polymer composition ratio Spin pack for composite spinning.   A polymer filter is mounted in each polymer flow path of the rectangular composite spinning spin pack, and the filter with the smaller polymer composition ratio is disposed in the front-rear direction so as to surround the side with the larger polymer composition ratio. The spin pack for rectangular composite spinning according to claim 1, wherein:   The spin pack for rectangular composite spinning according to claim 2, wherein the polymer filter is made of a wire mesh.

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