JPH05132811A - Spinneret for nonwoven fabric production apparatus - Google Patents

Abstract

PURPOSE:To obtain a spinneret for a nonwoven fabric of conjugated fiber having stable component ratio by forming the same number of resin-distribution holes as that of extrusion nozzles between the resin-straightening grooves and the extrusion nozzles, thereby uniformly distributing each resin in lateral direction and joining the individual resin flows. CONSTITUTION:A molten thermoplastic resin component 1 is passed through a straightening groove 1 and distributed to nozzles by a distribution hole 3. The other resin component 2 is passed through a straightening groove 2 and distributed to nozzles by a distribution hole 4. The distributed components 1, 2 are joined with each other in the middle of a joining groove 5 of a spinneret 8 and guided to the extrusion nozzles 6, 7. The joined resin has a cross section divided into two parts extruded through the nozzles 6 and 7. The extruded resin is drawn with high-speed air jet ejected from gas slits 9, 10 immediately after extrusion and spun in the form of a conjugate fiber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention spins molten thermoplastic resin simultaneously from a spinning device having a plurality of discharge holes.
A fluid is jetted at a high speed from a fluid jet slit installed adjacent to the spinneret to stretch the fibers of the thermoplastic resin, form a fiber stream composed of the fibers and the fluid, and then collect the fiber stream. The present invention relates to a spinneret for a non-woven fabric manufacturing device in a device for spraying onto a plate to manufacture a non-woven fabric composed of the fibers.

[0002]

2. Description of the Related Art A method for producing a non-woven fabric by melt-spinning a thermoplastic resin and blowing it onto a moving collecting plate to form fine fibers by a high-speed gas and collecting the nonwoven fabric is generally known. , JP-A-49-10258, JP-A-49-48921, and JP-A-50-121570.
It is known in Japanese Patent Laid-Open Publication No. 52-9823. However, these are usually made by spinning a single resin, and it is very difficult to give the spun yarn physical properties having lipophilicity, hydrophilicity, flame retardancy, bulkiness, strength and the like.
Further, as a method for imparting these physical properties, JP-A-60-99057 and JP-A-2-289107 disclose an apparatus for producing a composite fiber nonwoven fabric. However, in such a device, quality control is very difficult because the composition ratio in the cross section of the spun yarn may vary, or spun yarn of only a single component may occur. Since the length of the discharge hole is limited in processing, the wall thickness of the tip of the die becomes very thin, and the pressure resistance against internal pressure is 1
Since it is about 0 to 100 (kg / cm ² ), spinning conditions involving a large internal pressure, that is, high discharge spinning with a polymer such as polyester, nylon and polyethylene terephthalate, and spinning of a high viscosity polymer are impossible. ..
In addition, after the resin is adjoined, it is distributed to each number of holes, so that one component completely covers the other component, the sheath core type composite fiber nonwoven fabric or the component of the spun yarn is A mixed fiber non-woven fabric, which is different for each discharge hole, cannot be spun.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention is intended to solve such a problem, and is to provide a multifunctional melt blown nonwoven fabric in which spun yarn is imparted with hydrophilicity, flame retardancy, bulkiness, strength and the like. An object of the present invention is to provide a spinneret for a non-woven fabric manufacturing apparatus which improves quality and enables high viscosity polymer or high discharge spinning.

The present invention adopts the following means in order to solve the above problems. That is, according to the present invention, a plurality of types of molten thermoplastic resins are simultaneously spun from a spinning apparatus having a plurality of ejection holes, and a fluid is ejected at a high speed from a fluid ejection slit installed adjacent to a spinneret to generate the heat. In a device for drawing a fiber of a plastic resin, forming a fiber stream composed of the fiber and the fluid, and then spraying the fiber stream onto a collecting plate to produce a nonwoven fabric composed of a composite fiber, the rectification of each thermoplastic resin is performed. Between the groove and the discharge hole, the same number of distribution holes as the number of discharge holes are arranged for each thermoplastic resin, the spinneret of the non-woven fabric manufacturing apparatus, and the same number of thermoplastic holes as the number of discharge holes. 2. A resin confluence groove is provided.
It is the spinneret of the nonwoven fabric manufacturing apparatus described.

An example of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a spinneret block according to the present invention, and FIG. 2 is a cross-sectional view of a spinneret 8 taken along line II-II in the arrow direction. 14 is a straightening block, 15 is a distribution block, 8 is a spinneret, 16,
17 is a lip plate. These are bolts 11, 1
They are connected by 1 ', 12, 12', 13, 13 '. The molten thermoplastic resin component 1 passes through the flow regulating groove 1 and is distributed by the distribution holes 3 to the number of discharge holes. On the other hand, the component 2 passes through the straightening groove 2 and is distributed by the distribution hole 4 to the number of ejection holes. The distributed components 1 and 2 merge at the central portion of the merge groove 5 provided in the spinneret 8 and are guided to the discharge holes 6 and 7. The merged resin has a cross section that divides the two in the discharge holes 6 and 7, and immediately after being discharged, it is stretched by high-speed air jetted from the gas slits 9 and 10 and spun as a composite fiber.

The distribution holes 3 and 4 preferably have a diameter of 0.1 (mm) or more and 3.0 (mm) or less, particularly 0.5 (m).
It is preferably m) or more and 1.0 (mm) or less. Also L / D
The (pore length / pore diameter) is preferably 5 or more and 20 or less, and particularly 1
It is preferably 0 or more and 15 or less. The groove depth of the confluent groove 5 is 0.
It is preferably 1 (mm) or more and 5 (mm) or less, and particularly 1.
It is preferably 0 (mm) or more and 2.0 (mm) or less. The length of the major axis in the cross section is 1 (mm) or more and 10 (m).
m) or less is preferable, particularly 3 (mm) or more and 6 (mm)
The following are preferred. Ratio of two-stage discharge hole diameter (upper discharge 6 /
The lower discharge hole 7) is preferably 1.5 or more and 10 or less, and particularly preferably 3 or more and 5 or less. L / D is preferably 5 or more and 20 or less with respect to the upper discharge hole 6, particularly 10 or more,
It is preferably 15 or less. 2 or more for lower discharge 7, 1
It is preferably 5 or less, particularly preferably 5 or more and 10 or less.
When such a spinneret block is used, each component is evenly distributed to the number of discharge holes before they merge, so that the variation in the component ratio between the discharge holes and the temporal variation are extremely small.
A stable quality composite fiber nonwoven fabric is obtained. Further, by forming the discharge holes as two-stage holes having different diameters, the discharge hole length can be increased without disturbing the resin flow at the time of merging and without increasing the pressure loss in the discharge holes. Makes it possible to increase the wall thickness of. That is,
The pressure resistance of the tip of the spinneret is 3 to 5 times higher than usual, and spinning with high viscosity polymer and high discharge becomes possible. Furthermore, by randomly changing the diameter of each distribution hole, it is possible to stably obtain composite yarns having different component ratios. 3 and 4 show an example of a spinneret for solving the problems. In FIG. 3, a circular pipe 18 is provided at the tip of the distribution hole 4 on the component 2 side so that the circular pipe 18 is specially provided to the merging groove 5, and the discharge holes 6 and 7 are provided immediately below the circular pipe 18.
Set up. Therefore, the component 1 distributed by the distribution hole 3 is filled in the merging groove 5, and the discharge hole 6, 7 is spun out as a sheath core type composite fiber in which the component 2 completely covers the periphery of the component 2. Further, in FIG. 4, the distribution holes 3 of the component 1 and the distribution holes 4 of the component 2 are alternately arranged, and each component is discharged independently, so that the component of the yarn is different for each discharge hole. Non-woven fabric can be spun.

[0007]

【Example】

Example 1 In FIG. 1, the spinneret width 200 (mm), the distribution hole 3,
4, the hole diameter 0.9 (mm) L / D = 15, the groove depth 1 (mm) of the confluence groove 5, the length 6 (mm), and the diameter of the upper discharge hole 0.
8 (mm), L / D = 15, diameter of lower discharge hole 0.2 (m
m) and L / D = 10, and the material of the spinneret block was stainless steel (SUS630). Using such a spinneret, the composition ratio of colored polypropylene and polyethylene terephthalate was 1: 1 and the single hole discharge rate was 0.3 (g / min).
・ Spinning was carried out under conditions of high internal pressure such as pores) and internal pressure of 300 (kg / cm ² ), and spinning was possible without problems. The obtained sheet had good texture and bulkiness, which was not obtained by a single component, and in terms of quality, the average yarn diameter was 3.
It was 0 (μm) and the unevenness of unit weight was 5% or less, which was comparable to that of a single component. Also, when the yarn cross section of the sheet was observed, no single component yarn and no variation in the component ratio were confirmed. Example 2 In FIG. 3, the spinneret width is 200 (mm), the distribution hole 3 has a diameter of 0.8 (mm), L / D = 15, and the distribution hole 4 has a diameter of 0.5 (mm) and L / D. = 15, the circular tube 18 has an inner diameter of 0.
5 (mm), outer diameter 0.8 (mm), upper discharge hole diameter 0.
8 (mm), L / D = 15, diameter of lower discharge hole 0.2 (m
m) and L / D = 10, and the material of the spinneret block was stainless steel (SUS630). When such a spinneret was used and the polymer used and the single hole discharge rate were the same as in Example 1, the yarn cross section of the obtained sheet had a sheath core in which one component completely covered the other. It was a type composite fiber. Example 3 In FIG. 4, the width of the spinneret, the distribution holes, and the discharge holes were the same as in Example 1, and polypropylene and polyester were spun at a single hole discharge rate of 0.3 (g / min · hole). It was possible to obtain a sheet having both lipophilicity and hydrophilicity and having little fuzz that cannot be imparted by each single component.

[0008]

INDUSTRIAL APPLICABILITY The spinneret of the present invention is a composite fiber in which a plurality of types of molten thermoplastic resins are simultaneously spun out from a plurality of discharge holes, drawn by a high-speed fluid, and then sprayed onto a collecting plate. In the equipment for manufacturing non-woven fabric, by installing the same number of resin distribution holes as the discharge holes between the resin straightening groove and the discharge holes, the resins are evenly distributed in the width direction and then merge, so that the composition ratio is stable. The composite fiber non-woven fabric can be obtained. Further, by increasing the length of the discharge hole and improving the wall thickness of the tip of the spinneret, the pressure resistance of the spinneret is improved, and spinning of a high viscosity polymer and high discharge spinning are possible. In addition, a circular tube is provided at the tip of one of the distribution holes, and a discharge hole is installed immediately below the circular tube to form a sheath core type composite fiber, and
It is also possible to obtain a mixed fiber non-woven fabric by arranging the distribution holes for each component alternately and discharging each component independently, whereby the yarn component is different for each discharge hole.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a spinneret block according to the present invention.

FIG. 2 is a part of a cross-sectional view seen in a direction of an arrow along a spinneret II-II line.

FIG. 3 is a sectional view showing another example of the spinneret block according to the present invention.

FIG. 4 is a cross-sectional view showing another example of the spinneret block according to the present invention.

[Explanation of symbols]

 1 rectification groove 2 rectification groove 3 distribution hole 4 distribution hole 5 merging groove 6 upper discharge hole exit hole 7 lower discharge hole 8 spinneret 9 gas slit 10 gas slit 11 tightening bolt 12 tightening bolt 13 tightening bolt 11 'tightening bolt 12' tightening Bolt 13 'Tightening bolt 14 Straightening block 15 Distribution block 16 Lip plate 17 Lip plate 18 Circular tube

Claims (2)

[Claims] 1. A plurality of types of molten thermoplastic resins are simultaneously spun from a spinneret having a plurality of discharge holes, and fluid is spouted at a high speed from a fluid spout slit installed adjacent to the spinneret. While stretching the fibers of the plastic resin,
In a device for producing a fiber stream composed of the fibers and the fluid and then spraying the fiber stream onto a collecting plate, in a device for producing a nonwoven fabric composed of the fibers, a straightening groove of each thermoplastic resin and the discharge hole are formed. A spinneret for a non-woven fabric manufacturing apparatus, characterized in that it has as many distribution holes as there are discharge holes for each thermoplastic resin. 2. The spinneret for a nonwoven fabric manufacturing apparatus according to claim 1, wherein the same number of confluence grooves of the thermoplastic resin as the number of discharge holes are provided.