JPH02289107A - Melt-blowing spinning device - Google Patents

Abstract

PURPOSE:To provide the subject spinning device for simply and profitably preparing wide, uniform non-woven fabric having good bulky touch by disposing a plurality of single resin-straightening sections, a gathered resin-straightening section and a plurality of nozzles in a melt-blowing spinneret block. CONSTITUTION:A melt-blowing spinning device is provided with a spinneret 23 attached to the lower portion of a melt-blowing die main body 22 with bolts 27, the main body being dividable into portions 22-1, 22-2 and 22-3, cylindrical resin-feeding openings 11 and 12 formed in the upper portion of the main body, approximately conic manifolds 13 and 14 communicated with the resin-feeding openings, two or more of single resin-straightening sections 15 and 16, a gathered resin-straightening section 17 and a plurality of spinning nozzles 18. Raw material are measured with measuring pumps 20 and 21, respectively, in the melt- blowing spinning device, fed into the resin-feeding openings 11 and 12 through resin passageways 9 and 10, straightened with the simple resin-straightening sections 15 and 16, introduced into the gathered resin-straightening section and subsequently extruded from the spinning nozzles 18 to provide a wide, uniform fibrous non-woven fabric.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention involves extruding a resin in a melted or solution form into a high-speed jet gas fluid through a spinneret consisting of a plurality of pores.
This article relates to a spinneret block for a melt-blown spinning device that produces wI-like products.

(Conventional technology) Polymer! The melt-blown spinning method, in which resin is melted with heat or a solvent and spun into a high-velocity stream of α1 gas such as steam or air through a large number of pores perforated in a straight line in the spinning width direction, produces an ultrafine fiber web. I can be obtained in one step! This is an extremely useful nonwoven fabric manufacturing method because it is a quick and economical process.

Generally, JP-A No. 49-10258, JP-A No. 49-Sho.
-48921, JP 50-121570, JP 60-25524, JP 61-232
It is known from Publication No. 84, etc.

Conventionally, when manufacturing melt-blown nonwoven fabrics, a single resin is usually used for spinning, but the material has to be changed, such as making water-repellent resins shallower, or textures such as texture can be changed. For the purpose of changing the composition, resins of 2N or more are mixed and spun from a single nozzle.

However, there are limits to the improvement of product properties and quality by mixing such resins, and for example, it is difficult to improve product properties and quality by adding a coil crimp to the yarn to give the product a bulky feel.
It was difficult to make changes to the structure of the thread as shown in the figure.

Further, Japanese Patent Application Laid-Open No. 60-99057 describes an apparatus for producing a composite blown fiber web.

However, in order to obtain a product using this device, unless the viscosity of the different polymeric materials passing through the die is made similar, even if the separation plate is included in the goo cavity, two different polymeric materials will be produced. The resulting product does not have a uniform layered structure in the direction of the width, for example, the first component is concentrated in the center and other components are dispersed at both ends. This significantly reduces the product value.

Generally, when trying to obtain a product by combining two or more polymeric materials, the meaning of the composite is that the polymeric materials to be combined have different properties, but these different polymeric materials have different characteristics. The viscosities of polymeric materials with specific properties often vary widely when they pass through a die, and such nozzles have not been very desirable in practice.

(2) TOES~40 which is also generally used industrially
When trying to obtain a product with a width of 0c1, even if the viscosity is similar, rectification in the width direction is not performed.
There is no uniformity in the width direction, resulting in unevenness in the product.

(Problems to be Solved by the Present Invention) The present invention aims to solve the above-mentioned conventional problems by imparting structural changes to spun yarns, diversifying meltblown nonwoven fabric products, and improving product quality. In order to improve
It is intended to be used in melt-blown spinning equipment that combines resins with many different properties to produce wide, uniform products that are required industrially.

(Means for Solving the Problems) That is, the present invention has the following features: (1) A melt-blown spinneret block, which includes two or more individual resin rectifying sections, and [two or more combined resin rectifying sections and a plurality of spinnerets. Features of melt blown spinning equipment.

2) The melt blown spinning apparatus according to claim 1, wherein the length of the individual resin rectifying section is longer than the length of the confluence IM rectifying section.

3) The ratio between the length L3 and the thickness T of the confluent resin rectifying section is L!
A claim characterized in that /T, a<20 is satisfied! 2. The melt blown spinning device according to item 2.

4) The melt-blown spinning apparatus according to any one of claims 1 to 3, wherein the pitch of the plurality of spinnerets is 5 ms or less.

5) A claim characterized in that the ratio of the area R of the cross section perpendicular to the flow direction of the merging resin straightening section to the total area S of the cross sections perpendicular to the flow direction of the plurality of spinnerets satisfies R/S < 2000. The melt blown spinning apparatus according to any one of items t to 4.

6) The melt-blown spinning apparatus according to any one of claims 1 to 5, characterized in that a circular tube section is provided between the confluent resin rectifying section and the spinning nozzle, and a static mixer is inserted therein.

It is.

That is, the melt-blown spinning apparatus of the present invention has a rectifying section for two or more resin paths, and each resin path is rectified in advance so that the flow is uniform in the middle direction. By combining two or more types of resin, it is possible to spin a yarn with a uniform structure in the width direction of a wide product.

When two resins with different properties are spun using the melt-blown spinning apparatus according to the present invention, depending on the ratio of their amounts and the difference in physical properties, for example, a half-moon shape as shown in FIG. 5, a three-moon shape as shown in FIG. 6, etc. Threads with a structure such as a laminate shape can be obtained uniformly in the direction of a wide product.

For example, when a product nonwoven fabric made by spinning two types of resins with different heat shrinkage rates as shown in Figure 6 is heat-treated, it develops the same effect as bimetal and each thread becomes a coil crimp, which is different from the conventional one. A high-quality nonwoven fabric with a bulky feel compared to a meltblown nonwoven fabric can be obtained.

Next, embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to these embodiments.

FIG. 1 shows a melt-blown spinning apparatus according to a first embodiment of the present invention, and FIG. 2 shows a cross-sectional view thereof. FIG. 1 is a view taken along the line A--A in FIG. 2, indicated by a dashed line.

The melt blowing body 22 is made of stainless steel, and two gear pump type @i fat metering pumps 20.2 are mounted on both sides of the gear pump mounting seat 19 attached to the top of the melt blowing body 22.
1 is installed.

A cap 23 made of stainless steel is attached to the lower part of the main body 22 with cap mounting bolts 27.

Furthermore, a heater 24 is attached to the top surface and four side surfaces of the main body 22, so that the main body 22 can be heated. Gui body 2
2 can be divided into three parts, 22-1, 22-2, and 22-3 in the figure, and these parts are firmly joined by a gouey connection bolt 22-4 to form the gouie main body 22. Two cylindrical resin supply ports 11 and 12 with a diameter of ioms are opened in the upper part of the main body, the discharge ports of the metering pumps 2G and 21, and two resin passages 9 opened in the gear pump mounting seat 19.
, lO. Each resin supply port 11S
The manifold 12 is connected to manifolds 13 and 14, each having a substantially conical shape tapering from 20 mm in diameter to 5 mm in diameter.

Below the manifold are each 303mm in diameter and approximately 21mm thick.
The single resin rectifiers 15 and 16 of 1 are connected, and both of these two individual resin rectifiers 15 and 16 are combined resin rectifiers with a width of 303cm, a thickness of 4Illl, and a length of 15-1, which are bored below the base 23. Single resin rectifying section 15 opening in section 17
, [6 is the middle 3031. that protrudes below Gui 22-2. The convex part has a thickness of 30 mm and a length of approximately 56 mm, and a hole is made in the upper part of the base 23 that has a width of 303 mm, a thickness of 34 mm, and a length of approximately 58 mm.
Width 303cm and thickness approximately 2mm formed by fitting the recesses of
It is a path for the plow.

Below the merging resin straightening section 17, there is a diameter of OJ with a pitch of 1.
, 301 cylindrical spinnerets 18 with a length of 3 cm are opened to the outside.

A gap 30 for gas ejection is provided between the lip 31 and both sides of the base 23 and has a width of 400 mm and a length of about IQam of about 0.2 m.

One raw material resin is metered by a metering pump 2o, continuously supplied to a resin supply port 11 through a resin passage 9, rectified by an individual resin rectifier 15, and guided to a combined resin rectifier 17. The other raw material resin is metered by a metering pump 21 and continuously supplied to the resin supply port 12 through the resin passage 10, and each resin is uniformly rectified in the direction of the product in the individual resin rectifying section 16, and the resin is uniformly rectified in the direction into the product. Guided by 17. Merging resin rectifying section 17
The two types of resins that have merged at the point usually have a viscosity of 10 to 5,000 voids and a flow rate of about 1" to 100 cm/min, and the flow is in a laminar region, so it is thought that they will not mix much and will move through the merging resin rectifier. It will be done.

Therefore, the yarn that flows uniformly down the merged resin rectifying section 17 and is discharged from the spinning nozzle 18 contains two resins. The yarn is not a mixture, but has a structure in which two components are separated and pasted together.

It is preferable that the length of each individual resin rectifying section, L, be as long as possible in order to distribute the resin uniformly in the width direction. It is appropriate to set the distance between lhm and 100+am.

Also, it is preferable that the thickness No. 8, T, of each individual resin rectifying section be as small as possible in order to distribute the resin uniformly in the width direction, but conversely, if it is too small, pressure loss due to the resin passing through will occur. becomes large and undesirable 1mg+~6
■■ is appropriate. In other words, it can be said that it is preferable that the ratio between the length 3, L3 and the thickness T l sT of each individual resin rectifying part is as follows.

The length of the combined resin rectifying section 3 and the length of each individual resin rectifying section, L, is Ls<L+, L.

It is preferable that the relationship is as follows: If the relationship is reversed, uniformity in the width direction of the product may be lost.

The length of the confluence resin rectifying part is too long, or the thickness T
If , is too small, mixing and turbulence will occur among the resins, and the uniformity of the spun yarn will be impaired. Therefore, it is preferable that the size ratio is appropriate, and Ls/3 < 20.

If the pitch of the spinneret is too large, when the combined resin is cut and distributed to the spinneret in the confluence resin rectification section, there will be variations in the resin composition ratio between each spinneret, and normal spinning may not be possible. It is appropriate that it is 5sm or less.

If the ratio of the cross-sectional area R perpendicular to the flow direction of the merging resin straightening section to the total cross-sectional area S of the many spinnerets perpendicular to the flow direction is too large, the structure will be disturbed between each yarn, resulting in a small is preferable, and more preferably <2000.

The resin discharged from the spinning nozzle 18 is stretched by gas ejected at high speed from slits 30 provided on both sides of the spinning yarn 018, cooled and solidified, and formed into a nonwoven fabric.

As shown in the second embodiment shown in FIG.
．． It is preferable to provide 42.

In FIG. 3, a portion corresponding to the die 22-2 described in the first embodiment is divided into an upper part 45 and a lower part 46, and each lower part 46 has 21 cylindrical shapes each having a diameter of 2 mm and a length of 15 agi. Plate-shaped filter support parts 46A and 46B having holes 43 and 44 are added.

The die lower part 46 is supported by the cap 23 by filter support parts 46A and 46B attached on both sides, and forms independent resin rectifying parts 15 and 16 as in the first embodiment without falling into the hole in the cap. It is connected to the merging resin rectifying section 17.

In the second embodiment, the width of the independent resin rectifying section 15 and the sixth section is 303 um, the thickness is 2 mm each, and the length in the resin traveling direction including the oblique portion is about 45 mm.

FIG. 4 is an enlarged view of the vicinity of the discharge port 18 from the confluence resin rectifying section 17 of the third embodiment based on the present invention.

Connected to the lower part of the merging resin rectifying section 17 with a diameter of 303nu+, a thickness of 4mm, and a length of 10Il@, and a diameter of 3.4mm and a length of 2.
2. , 75 circular pipe portions 34 are provided at a pitch of 4+am, and a discharge port 18 with a diameter of 0.4-1 and a length of 4-mm is provided at the tip.

Inside the inner tube part 34 is a diameter of 3.4 mm and a length of 5 mm. An insertion is made by connecting three elements of the single plate 180° twisted element 35 of b++■.

As in the first embodiment, the two types of resins sent from the individual resin rectifiers 15 and 16 and rectified by the combined resin rectifier 17 are divided into 75 parts by the inner tube part 34 population.

The static mixer 35 in the circular pipe portion 34 further divides these into 8 sections, which are stacked into 16 sections, and is discharged from the outlet 18.

Other types of mixers can also be used as long as they have the same functionality as the static mixer. For example, JP-A No. 6 (1-4)
It is also possible to employ a stationary splitting element as described in No. 5604.

The nonwoven fabric made using the spinning device of the present invention using two types of resins with different thermal properties has finer single filaments, making it possible to obtain a product with much finer dred fibers than the normally obtained meltblown nonwoven fabric. Ta.

Using the melt blown spinning apparatus of the present invention, we were able to perform melt blowing of thermoplastic polymers such as polyolefin and polyamide, and it was possible to obtain a nonwoven fabric with good physical properties and texture that had not been available up to now.

[Brief explanation of drawings]

1, 2, 3, and 4 are drawings of the melt-blown spinneret block of the present invention, in which FIG. 1 is a longitudinal cross-sectional view along the spinning width direction, FIG. 2, FIG. 3, FIG. 4 is a part of a vertical cross-sectional view perpendicular to the spinning width direction. FIGS. 6 and 7 schematically show an example of a cross section of a yarn obtained using the melt-blown spinning apparatus of the present invention. Patent Extraction Company Aji Shiki Company

Claims (1)

[Scope of Claims] 1) A melt-blown spinning device characterized in that a melt-blown spinneret block is provided with two or more individual resin rectifying sections, one combined resin rectifying section, and a plurality of spinning ports. 2) The melt-blown spinning apparatus according to claim 1, wherein the length of the individual resin straightening section is longer than the length of the combined resin straightening section. 3) The melt-blown spinning apparatus according to claim 1 or 2, wherein the ratio of the length L_3 and the thickness T_3 of the confluent resin straightening section satisfies L_3/T_3<20. 4) The melt-blown spinning apparatus according to any one of claims 1 to 3, wherein the pitch of the plurality of spinnerets is 5 mm or less. 5) A claim characterized in that the ratio of the area R of the cross section perpendicular to the flow direction of the confluent resin straightening section to the total area S of the cross sections perpendicular to the flow direction of the plurality of spinnerets satisfies R/S<2000. Item 5. The melt-blown spinning apparatus according to any one of Items 1 to 4. 6) The melt blown spinning apparatus according to any one of claims 1 to 5, characterized in that a circular tube section is provided between the confluent resin rectifying section and the spinning nozzle, and a static mixer is inserted therein.