JPH0226976A - Melt blown-type spinning apparatus - Google Patents

Abstract

PURPOSE:To facilitate the change of the width of product by using a supporting mechanism for supporting a spinneret block in such a manner as to enable the change of the arranged direction of nozzles in a plane parallel to a collected nonwoven fabric relative to the lateral direction of the collected fabric. CONSTITUTION:A metal mesh belt 6 is transported in the direction of the arrow at a definite speed. A spinneret block 9 is supported above the metal mesh belt 6 with a supporting mechanism in such a manner as to enable the change of the angle theta relative to the direction of the arrow (b) which is the lateral direction of the mesh belt 6. The spinneret block 9 has spinning nozzles arranged linearly over the length l. The width W of the nonwoven fabric is expressed by the formula W=lcostheta. The width (W<=l) can be varied by varying the angle theta.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a melt-blown spinning device suitable for producing ultrafine fibrous materials as raw materials for medical masks, gowns, tent materials, wall materials, etc. It is something.

[Prior Art] As is well known, this type of spinning device melts a high molecular weight resin with heat or a solvent and passes it through a large number of spinnerets consisting of pores arranged linearly along the spinning width direction. A nonwoven fabric is formed on an endless collecting body such as a wire mesh belt that moves in a direction perpendicular to the spinning width direction while being extruded into a high-velocity jet stream of gas such as water vapor or air. It is prized in the production of nonwoven fabrics as it is a simple and economical method that allows ultrafine fiber webs to be obtained in one step.

[Problems to be Solved by the Invention] By the way, the product width of the nonwoven fabric is determined by the arrangement length (spinning width) of a large number of spinnerets, but in conventional equipment, the spinnerets are formed Since the spinneret block is installed in a fixed state, there is a problem in that it is difficult to quickly respond to various product widths requested by users.

Manufacture products with various widths requested by users - One method is to spin the yarn using a wide spinneret that can accommodate all the widths requested, and then cut off the unnecessary parts and send them to another user or discard them. Measures are being taken. but,
In this case, an uncut portion desired by another user is not necessarily produced, and often remains as inventory.

On the other hand, a method has been adopted in which multiple types of spinnerets corresponding to various product widths are prepared and the length of the spinneret is replaced according to the product width requested by the user to spin the yarn.
In this case, multiple types of spinnerets must be prepared, which not only increases costs, but also necessitates long operation stoppages to replace the spinnerets, which is an impediment to improving productivity. Ta.

This invention was made in order to solve the above-mentioned problems of the conventional products, and it is possible to easily respond to diversification of product range without causing a decrease in product yield, and to contribute to improving productivity. The purpose is to provide a blown spinning device.

[Means for Solving the Problems] A melt-blown spinning device according to the present invention includes an endless belt-shaped nonwoven fabric collecting body that is driven to advance in the longitudinal direction, and a nonwoven fabric collecting body that extends linearly along the width direction of the nonwoven fabric collecting body. a spinneret block for extruding a molten high molecular weight resin into a high-velocity gas jet stream through a spinneret having a large number of arranged pores and spinning it onto the nonwoven fabric collection body; A support mechanism is provided that supports the spinneret block at a variable angle within a plane whose arrangement direction is parallel to the nonwoven fabric collector with respect to the width direction lζ of the nonwoven fabric collector.

[Operation] In this invention, by selecting and setting the angle of the spinneret arrangement direction with respect to the width direction of the nonwoven fabric collector using the support mechanism of the spinneret block, the spinning width can be changed and a nonwoven fabric product of any width can be obtained. .

[Example] An example of the present invention will be described below with reference to the drawings.

FIG. 1, FIG. 2, and FIG. 3 are front sectional views showing an example of a melt-blown spinning device according to the present invention, respectively;
FIG. 2 is a top view and a partially blocked side sectional view.

In the figure, 1 is a main body frame, and this main body frame 1 has two pairs of bearings 2A, 2B, and 3A located on the front side and the rear side, respectively.

3B is provided, each bearing 2A, 2B and 3A,
3B has a support roll 4A, respectively.

4B, 5A, and 5B are pivotally supported. Reference numeral 6 designates an endless nonwoven fabric collector, such as a wire mesh belt, which is stretched in a loop shape around the support rolls 4A, 4B, 5A, and 5B. The above support rolls 4A, 4B.

Among the support rolls 5A and 5B, one support roll 4A is made of a rubber roll with a diameter of 40 cm and a width of 60 cm. It is made to advance at a constant speed in the direction of arrow a).

Above the wire mesh belt 6, a spinneret block 9 is arranged along the width direction of the wire mesh belt 6 (in the direction of the arrow), that is, along the spinning width direction. The lock 9 in this spinneret will be briefly explained with reference to FIGS. 5, 6 and 7.

Reference numeral 10 denotes a spinneret body made of stainless steel, and a resin flow path 11 with a width of about 16 mm and a height of about 16 mm is bored in the spinneret body 10 along the spinning width direction. 1
Reference numeral 2 designates a plurality of sets of resin supply holes each having a diameter of about 10 mm, which are formed in pairs at predetermined intervals in the spinning width direction of the spinneret body 10 and communicate with the resin flow path 11. One opening is open.

13 is a resin boat 13a corresponding to the resin supply hole 12;
A gear pump mounting portion is fixed to the spinneret body 10 with bolts 14 or the like, and a metering pump, for example, a gear pump 15 is attached to each of the parts, and the discharge port of each gear pump 15 and the resin supply hole 12 are connected to each other. They are communicated via the resin port 13a.

The spinneret main body 10 has heaters 18 and 19 attached to its top and side surfaces with bolts 16, 17, etc., respectively.
It is designed to be heated. 20 is a heater attached to the gear pump attachment part 13.

For example, a diameter D=2 m is provided below the resin flow path 11.
A large number of pores 21 with a length L=21 mm (L/D=10°5) are bored at a pitch of about 3 mm along the spinning width direction, and these pores 21 allow the resin distribution mechanism 22 It consists of

23 is a spinneret fixed by bolts 24 on the lower surface of the spinneret main body 10, and this spinneret 23 has a slit with a length of 303 mm in the spinning width direction, a cross-sectional width of 6 mm, and a length of 45 mm in the vertical direction, for example. A shaped resin rectifying section 25 is formed, and the upper end of this resin rectifying section 25 communicates with each of the pores 21 in the resin distribution mechanism 22 .

The lower end side of the spinneret 23 has a diameter of, for example, 0.3 m.
m, a large number of pore-like spinning holes 26 with a length of 3 mm in the vertical direction
are linearly arranged along the spinning width direction at a pitch of about 1 mm, and each communicates with the resin rectifying section 25. The array length of the spinning ports 26 is the effective length of the spinning width, and is set to, for example, 300 mm here.

A pair of lip members 27 and 28 extending along the spinning width direction are arranged on both sides of the spinneret 23, and a pair of lip members 27 and 28 are provided between the lip members 27 and 28 and the outer surface of the tip of the spinneret 23. are formed with slits 29.30 for blowing out air, and the inner ends of both slits 29.30 are respectively connected to air passages 32.30 connected to air supply pipes 31 (FIGS. 1 and 3).
It is connected to 33.

Regarding the support structure of the spinneret block 9, FIG.
This will be explained with reference to FIGS. 2 and 4.

Reference numerals 34A and 34B denote a pair of left and right horizontal frames supported by pillars 35A and 35B located on both the front and rear sides of the wire mesh belt 6, and between both horizontal frames 34A and 34B, there is a frame installed across the top of the wire mesh belt 6. A frame 36 is supported and fixed. The construction frame 36 includes an inner ring 37A having teeth 37a on the inner peripheral surface, and a ball 3 on the inner ring 37A.
The outer ring 37B of the ball bearing 37 is fixed to the ball bearing 37. Reference numeral 38 denotes a pedestal fixed to the inner ring 37A of the ball bearing 37 via a suspension member 39, and a plurality of gear pump drive machines 40 corresponding to the gear pumps 15 are attached to the pedestal 38. , the spinneret block 9 is suspended via bolts 41 etc.
\ru. 42 is a gear pump 15 mounted on the pedestal 38.
This is a rotation speed detector.

43 is a rotary drive device attached to the upper surface of the construction frame 36, for example, a motor; 44 is an output gear that meshes with the teeth 37a of the ball bearing 37; 45 is a worm gear that reduces the rotational force of the motor 43, etc. This is a speed reduction mechanism consisting of an output shaft 4 of this speed reduction mechanism 45.
The output gear 44 is fixed to 6. A bearing 47 is attached to the construction frame 36 and pivotally supports the output shaft 46. The horizontal frame 34A.

A support mechanism 48 for the spinneret block 9 is composed of the 34B1 support 35A, the 35B% construction frame 36, the ball bearing 37, the motor 43, the output gear 44, the deceleration mechanism 45, the output shaft 46, and the like. This support mechanism 4
8, the angle θ (FIG. 8) between the arrangement direction of the spinnerets 26 and the width direction of the wire mesh belt 6 in a plane parallel to the upper surface of the wire mesh belt 6 is set variably.

Reference numeral 49 denotes an angle display plate installed on the construction frame 36 via the support wall 50, and the rotation axis 52 of the display pointer 51
is connected to the speed reduction mechanism 45 via, for example, helical bevel gears 53 and 54. 55 is a rotation angle detector attached to the vertical wall 56 of the construction frame 36.

57 is a bearing member for the rotating shaft 52.

In addition, in the figure, 58 is a resin feeding vibe connected to the inlet side of the gear pump 15.

Next, the operation of the above configuration will be explained.

The high molecular weight resin fed through the resin feeding vibe 58 is metered by the gear pump 15, fed to the resin flow path 11 via the resin port 13a and the resin feed hole 12, and distributed to the left and right while being heated. The cross-sectional shape of this resin flow path 11 can be arbitrarily selected, but the inner diameter must be set large enough to allow the resin supplied from the resin supply hole 12 to flow in the spinning width direction without suffering a large pressure loss. There is.

The resin fed in the spinning width direction in the resin flow path 11 is distributed by each pore 21 of the resin distribution mechanism 22 and sent to the resin straightening section 25. In terms of increasing the flow rate of the resin,
It is better to have a small number of pores 21, but if the number is too small, there is a risk of resin retention in the resin straightening section 25, so it is appropriate to set the number to about 5 to 50 per 1000 mm of effective spinning width. .

The resin homogenized in the resin rectifying section 25 is discharged from the spinning nozzle. At this time, the slits 2 on both sides of the spinneret 26
Since air is ejected at a high speed from 9.30, the resin discharged from the spinning nozzle 26 is blown away by the air, becomes fine, and is deposited on the wire mesh belt 6 as a fiber web. Since the wire mesh belt 6 moves at a constant speed in the longitudinal direction, the fibrous web is continuously formed on the wire mesh belt 6 as a sheet-like nonwoven fabric M having a constant thickness. The arrangement effective length of the spinneret 26 becomes the spinning width, that is, the width of the nonwoven fabric M.

The nonwoven fabric collecting body is not limited to the wire mesh belt 6, and may be any endless body such as a rubber belt or a fabric belt. However, in the case of the wire mesh belt 6, the resin from the spinneret 26 can be easily collected. .

Here, since the spinneret block 9 is rotatably displaceable in the horizontal plane by the support mechanism 48, the width W of the nonwoven fabric can be changed by rotationally displacing the spinneret block 9.

That is, the inner ring 37A of the ball bearing 37 is driven by the output gear 44 via the deceleration mechanism 45 by driving the motor 43.
When the spinneret block 9 is rotationally displaced, the spinneret block 9 is rotationally displaced. When θ is the angle between the arrangement direction of the spinnerets 26 and the width direction of the wire mesh belt 6 and the effective length of the arrangement of the spinnerets 26, the width W of the nonwoven fabric M is expressed by the following formula (FIG. 8).

W=IL cos θ By changing the above angle θ, a nonwoven fabric M having an arbitrary width (W≦inclusive) can be obtained. Therefore, there is no need to leave unnecessary parts in the nonwoven fabric product as in the past, and one spinneret 23 can be used to produce any nonwoven fabric width, which improves productivity and contributes to cost reduction. I can do it.

It is also possible to change the angle θ by manually attaching the spinneret block 9 directly to the construction frame 36, but in that case, the operation of this device must be temporarily stopped each time the angle θ is changed. heaters 18, 19 .
Care must be taken not to change the heating conditions by 20. Regarding this point, in the above example, the angle θ can be automatically variably set by feeding back the detection signal of the angle detector 55 to the motor 43 to control the motor 43, so that the change in the nonwoven fabric width W can be made automatically. There is no need to stop the operation every time, therefore the heating conditions can be kept constant and variations in the quality of nonwoven fabric products can be suppressed. Further, since the angle θ is indicated by the pointer 51 on the angle display plate 49, it becomes easy to confirm the angle θ.

By the way, the support mechanism 48 of the spinneret block 9 is as follows:
It goes without saying that the present invention is not limited to the above example, and other configurations may be adopted as appropriate.

If you use the ball bearing 37 as in the example above,
The hollow part of the ball bearing 37 can be used, for example, as a space for inserting various pipes, and the inner ring 37A of the ball bearing 37 and the outer ring 37B are connected to the ball 3F C.
Since the spinneret blocks 9 are fitted together to maintain a close connection relationship, horizontal support precision of the spinneret block 9 is ensured, and the thickness distribution of the nonwoven fabric M can be made uniform.

In addition, in the above example, the nonwoven fabric product width W is relatively large.
However, if the nonwoven fabric product width W is small, the spinneret block 9 and the construction 38 will also be small, so the gear pump 5 and gear pump driver 40 may be provided externally.

Further, the web accumulation surface of the wire mesh belt 6 does not necessarily have to be a horizontal plane as described above, but can also be a vertical plane or an inclined plane.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, and FIG. 3 are front sectional views showing an example of a melt-blown spinning device according to the present invention, respectively;
A top view and a partially blocked side sectional view; FIG. 4 is a side sectional view showing the structure of the spinneret block, support mechanism, and their surroundings in the same device; FIGS. 5 and 6 show spinning in the same device, respectively. A front sectional view and a side sectional view showing the structure of the spinneret block, FIG. 7 is a bottom view of the spinneret in the spinneret block, and FIG. 8 is an explanatory diagram of the operation of the main parts of the apparatus. 6... Nonwoven fabric collector, 9... Spinneret block, 2
6... Spinneret, 48... Support mechanism, a... Longitudinal direction (progressing direction), b... Width direction, θ... Angle. Figure 6 Procedure-? ll], -r, E, TJjFl, Indication of the case Patent application 1777369/1983 2. Name of the invention Melt-blown spinning device 3, relation to the stand for supplementary iF case Patent applicant Zip code 710 Address Okayama 1621 Sakaoki, Kurashiki City, Prefecture Name (
108) Kuraray Co., Ltd. 4, agent mail (ψ number 550 Figure 8 θ: Corner cliff 7, content of amendment A, specification: (117! 8ri 2nd line IJ: "Lock 9" is replaced with ""Block9" and revised page 9th line: "Spinning [Moon" is revised to "spinneret". (3) Page 7, 7th line = r3mmJ is revised to r30mmJ (4) 12) 1, line 12 0: Add “wo” after “spinneret block 9”. 15) Page 14, line 18 and line 20 of the same page: “Erection” I will correct the text to read "trestle". 11. Drawing: (Otori) In order to correct the code I3 on the left side of Figure 6 to 20, we will resubmit the same figure as attached. That's all! Bakuyama'1J-E publication-P Figure 1, Indication of the case Patent application No. 177738/1983 2゜3゜Name of the invention Melt-blown spinning device 6 Person making the amendment Relationship to the case Patent applicant postal code 710 Address 1621 Sakaoki, Kurashiki City, Okayama Prefecture Name
(10B) Kuraray Co., Ltd. 4, Agent Postal Code Address Name 5a ¥3, Nishikicho-cho, Nishi-ku, Osaka (Fuso Building) Patent Attorney (7415) Kunihide Namba (Sotofuina) 1999 5F1
Contents of Supplement 1E in Column 7, Supplement 1E of “Contents of Amendment” on the procedural amendment table submitted on the 16th (1) Page 2, line 6 of the procedural amendment table: “Page 6, line 15” Correct it to "1". ``Page 6, No. 5, Procedures I, Book E 1, Indication of the case, Patent Application No. 177736/1983, Title of the invention: Melt-blown spinning device 3゜Relationship with the case Patent Applicant postal code: 710 Address: 1621 Sakeritsu, Kurashiki City, Okayama Prefecture Name:
(108) Kuraray 4 Co., Ltd. Agent Postal code Address Name Nishikicho IT, Nishi-ku, Osaka City [-15-3 (Fuso Building)
Patent attorney (74153 Kuniyoshi Namba (foreign name) 6, "Detailed explanation of the invention" in the memorandum to be amended #7, contents of the amendment Δ. Details: (+) No. 1 5 Tei 1st line 1 Chou 1: The word “5” should be corrected to +5J.

Claims (1)

[Claims] (1) A molten high molecular weight material is passed through an endless belt-shaped nonwoven fabric collecting body that is propelled in the longitudinal direction and a large number of pore-shaped spinning holes arranged linearly along the width direction of this nonwoven fabric collecting body. In a melt-blown spinning device equipped with a spinneret block that extrudes resin into a high-velocity gas jet stream and spins it onto the nonwoven fabric collector, the direction in which the spinnerets are arranged is in the width direction of the nonwoven fabric collector. A support mechanism is provided to support the spinneret block at a variable angle within a plane parallel to the nonwoven fabric collector.
Blown spinning equipment.