JPH02104756A - Spinning device of melt blow type - Google Patents

Abstract

PURPOSE:To obtain nonwoven fabric with any width by making a spinneret having a great number of nozzles set in row on a straight line and a suction device laid opposingly to the spinneret below a nonwoven fabric collecting member inclinable against the traveling direction of the collecting member. CONSTITUTION:In nonwoven fabric production device wherein a great number of nozzles to deliver a molten polymer resin are laid in a straight line above a collecting member 6 consisting of an endless belt having air-permeable holes, a spinning block 9 to blow fibrous materials delivered from a great number of the nozzles downward is provided and an air sucking means 10 is set right under the collecting member 6 opposingly to the spinning block 9 and the spinning block 9 and the air sucking means 10 can be inclined against width direction in a plane parallel to the collecting member 6.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a melt-prone 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. , which is a simple and economical method that allows an ultrafine fiber web to be obtained in one step, is prized in the production of nonwoven fabrics.

[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, or in the conventional apparatus, the width of the spinneret is Since the spinneret block is installed in a fixed state, there is a problem in that it is difficult to quickly respond to various manufacturing widths requested by users.

One way to manufacture products with various widths requested by users is to spin them using a wide spinneret that can accommodate all the widths requested, and then cut off the unnecessary parts and either send them to another user or discard them. Measures are being taken. but,
In this case, it is not always the case that there will be an uncut portion desired by another user, and the uncut portion will often remain as inventory. On the other hand, a method has also been adopted in which multiple types of spinnerets corresponding to various product widths are prepared and the length of the spinneret is changed according to the product width requested by the user to spin the yarn. , multiple types of spinnerets had to be prepared, which increased costs and required long operation stoppages to replace spinnerets, which was an impediment to improving productivity. .

This invention was made in order to solve the problems of the conventional products mentioned above, and it is possible to easily respond to diversification of product range without reducing product yield, and to improve productivity. The purpose is to hang a prone-type spinning device.

[Means for Solving the Problems] A melt-prone spinning device according to the present invention includes a nonwoven fabric collector having an endless belt-like ventilation hole that is driven to advance in a longitudinal direction, and a slit-shaped exhaust provided on the back surface of the nonwoven fabric collector. The molten high molecular weight resin is extruded into a high-velocity gas jet stream through a spinneret and a large number of pore-shaped spinnerets linearly arranged along the width direction of the nonwoven fabric collector. a spinneret block for spinning on the aggregate, and a support mechanism that supports the spinneret block at a variable angle within a plane in which the direction in which the spinnerets are arranged is parallel to the width direction of the nonwoven fabric collector; and a support mechanism that supports the slit-shaped exhaust port at a variable angle so that the direction of the slit-like exhaust port is parallel to the arrangement direction of the spinnerets.

[Function] Instead of rotating the exhaust port according to the rotation of the spinneret according to the present invention, the present invention rotates only the spinneret and does not rotate the exhaust port, and instead of rotating the spinneret, one large enough to accommodate any angle is used. If the exhaust port is used, exhaust must be constantly exhausted from unnecessary places, and therefore an exhaust blower with an excessive displacement must be installed and operated, which is very uneconomical.

On the other hand, with the equipment according to the present invention that can exhaust air only where necessary in accordance with the rotation of the spinneret, unnecessary exhaust is not performed, and the cost of the product can be reduced accordingly.

Furthermore, in the method of obtaining a nonwoven fabric of any width by rotating only the spinneret and not rotating the exhaust port, at the exhaust port,
There has been a drawback that streaks appear at the intersections of the lines where the spinnerets are arranged and the support rods that support the nonwoven fabric aggregate having air holes in the form of an endless belt.

On the other hand, by changing the angle of the exhaust port of the present invention so that it is parallel to the direction in which the spinnerets are arranged, the support rod and the direction in which the spinnerets are arranged are parallel to each other. You can get it in width.

[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-prone type spinning apparatus according to the present invention, respectively;
FIG. 2 is a top view and a partially blocked side sectional view.

In the same figure, l is a main body frame, and this main body frame 1 is provided with two pairs of bearings 2A, 2B and 3^, 3B located on the front side and the rear side, respectively, and each bearing 2^ , 2B and 3A, 3B, support rolls 4A, 4B and 5A, 5B are supported respectively. 6 is the support roll 4A, 4B, 5A,
5B is a nonwoven fabric collecting body, such as a wire mesh belt, having endless ventilation holes stretched in a loop shape. Among the support rolls 4^, 4B, 5^, and 5B, one support roll 4γ is made of a rubber roll having a diameter of 40 cm and a width of 60C, for example, and transmits the driving force of a rotary drive device 7 such as a motor through a transmission belt 8. the wire mesh belt 6 in the longitudinal direction (arrow a
direction) at a constant speed.

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.

This spinneret block 9 will be briefly explained with reference to FIGS. 5, 6, and 7.

10 is a spinneret body made of stainless steel, and this spinneret body 10 has a width of 1611 us along the spinning width direction.
, a tree-grain flow path 11 with a height of about 16 mm is bored.

X2 is a plurality of pairs of resin supply holes each having a diameter of about 10+nm, which are formed at predetermined intervals in the spinning width direction of the spinneret body 10 and communicate with the resin flow path 11, and each pair is formed on the upper surface of the spinneret body 10. It is open to

13 is a resin boat 13a corresponding to the resin supply hole 12;
and a gear pump mounting part fixed to the spinneret body lO with a pin), 14, etc., each with a total of 1 pump,
For example, a gear pump 15 is attached, and the discharge port of each gear pump 15 and the resin supply hole 12 are communicated via the resin boat 13a.

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

The lower side of the resin flow path 11 has a diameter D=2, for example.
mm, length L = 21mm (L / D = 10
．． 5) The large number of pores 21 are 3 m along the spinning width direction.
These pores 21 are bored at a pitch of approximately m, and these pores 21 constitute a resin distribution mechanism 22.

Reference numeral 23 denotes a spinneret fixed by bolts 24 on the lower surface of the spinneret main body 10, and the spinneret 23 has a slit with a length of 303 am in the spinning width direction, a cross-sectional width of 6 mm, and a length of 45 III m in the vertical direction, for example. A shaped resin rectifying section 25 is formed, and the upper end of this resin rectifying section 25 is connected to the above-mentioned l1.
It communicates with each pore 21 in the distribution mechanism 22.

On the lower end side of the spinneret 23, there are, for example, straight 10, 3
mm, a large number of pore-like spinning yarns with a length of 3 mm in the vertical direction 02
6 are linearly arranged at a pitch of about 1 mm along the spinning width direction, and each communicates with the resin rectifying section 25. The array length Q of the spinnerets 26 is the effective length of the spinning width, and is set to, for example, 300 mm here.

A pair of lip members 27 , 28 extending along the spinning width direction are arranged on both sides of the spinning yarn 023 , and between the lip members 27 , 28 and the outer surface of the tip of the spinneret 23 . , air ejection slits 29.30 are formed, and the inner ends of both slits 29.30 are connected to air passages 32.
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.

34A and 34B are a pair of left and right horizontal frames supported by pillars 35A and 35B located on both front and rear sides of the wire mesh belt 6, and between both horizontal frames 34A and 34B,
An erection frame 36 that crosses above the wire mesh belt 6 is supported and fixed. The outer ring 37B of a ball bearing 37 is fixed to the construction frame 36, and includes an inner ring 37A having teeth 37a on the inner peripheral surface, and an outer ring 37B that fits into the inner ring 37A via balls 37C. 3
Reference numeral 8 denotes a frame fixed to the inner ring 37^ of the ball bearing 37 via a suspension member 39;
A plurality of gear pump drive machines 40 corresponding to the gear pumps 5 are attached, and the spinneret block 9 is suspended from the lower end of the pedestal 38 via bolts 41 and the like. 42 is a gear pump 1 mounted on the above-mentioned pedestal 38
5 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 frames 34A, 34
A support mechanism 48 for the spinneret block 9 is composed of the pillars 35A and 35B, the 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 48
Therefore, the angle θ 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
(Fig. 8) 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 5z.

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

There is a slit-length exhaust port 60 on the back side of the upper metal mesh belt 6.
is the provision.

The exhaust port 60 will be explained with reference to FIG. 9 and FIG. 1O.

The size of the exhaust port 60 is, for example, 50 mm in the width direction of the belt 6.
cm 1 is 20 cm in the length direction, and a wire mesh support rod 64 is provided inside thereof to prevent the wire mesh belt 6 from being sucked into the exhaust port 60 by the suction force of the exhaust blower.

The wire mesh support rod 64 is held at both ends by wire mesh support rod receivers 65 attached to the side wall of the exhaust port 60.

The wire mesh support rod 64 is made of a steel pipe with a diameter of 2 cI11, and its surface is covered with a heat-shrinkable fluorine-based resin tube for the purpose of improving sliding with the wire mesh 6.

The side surface of the exhaust port 60 is made of Tagtro O-1 manufactured by W4VI, and is shaped so that it becomes cylindrical as it goes downward.

A flange 6o-2 is welded to the lower end of the duct 60-1.

A bearing 66 for rotatably supporting the exhaust port 60 is inserted into the Franz 60-2. At the upper end of the duct 60-1 of the exhaust port 60, a table 60-3 made of JLIL board with a circular outer circumference is attached.
This is done in such a way that the conveyor 6 will not be prevented from moving even if the conveyor 6 rotates. The bearing 66 is also inserted into the flange 61-2 attached to the upper part of the exhaust duct 61, so that the air sucked from the exhaust port 60 can be discharged to the exhaust duct 61 through the central opening of the bearing 66. forming a passage.

The exhaust duct 61 is connected to the main body frame 1 by 1lif168.
The outlet is connected to the exhaust blower by another duct.

A large gear 69-1 is attached to a flange 6o-2 attached to the lower part of the exhaust port 60, and a small gear 69-2 is meshed with this.

The small gear 69-2 has a shaft 70, a bevel gear 71, and a reducer 62.
, and has a structure in which power is transmitted and rotated by a motor 63.

The speed reducer 62 and the bearing 72 are fixed to legs 73 attached to the main body frame 1.

Further, the motor 43 is electrically synchronized with the motor 63 so that their rotation angles are the same.

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

The high molecular weight resin fed through the finger feed pipe 58 is metered by the gear pump 15, is fed to the resin flow path 11 via the resin boat 13a and the resin feed hole 12, and is 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 dimension should be thick 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 (setting There is a need to.

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 stagnation in the resin straightening section 25, so it is appropriate to set the number to about 5 to 50 per 1000 m+n of spinning growth effect width. be.

II Ql homogenized in the resin rectifying section 25 is discharged from the spinning nozzle. At this time, since air is being blown out at high speed from the slits 29 and 30 on both sides of the spinning nozzle 26, the resin discharged from the spinning nozzle 26 is blown away by the air and thinned, resulting in an l#l fiber web. and is deposited on the wire mesh belt 6. Since the wire mesh belt 6 advances at a constant speed in the longitudinal direction, the fiber web is continuously formed on the wire mesh belt 6 as a notebook-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 air that has blown away the resin passes through the mesh of the wire mesh belt 6, passes through the exhaust port 6o provided on the back side of the wire mesh belt 6, and enters the exhaust duct 6.
1 and is exhausted by an exhaust blower (not shown) connected thereto.

Here, since the spinneret block 9 is rotatably displaceable in a horizontal plane by the prop machine 148, the width W of the nonwoven fabric can be changed by rotatably 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 also rotationally displaced. At the same time, when the motor 63 is driven and the flange 60-2 is rotationally displaced by the output gear 69-2 via the deceleration mechanism 62, the exhaust port 60 is rotationally displaced along with the spinneret block 9. When the angle between the arrangement direction of the spinnerets 26 and the width direction of the wire mesh belts is θ, and the arrangement effective length of the spun yarns 026 is σ, the width W of the nonwoven fabric M is expressed by the following formula (FIG. 8).

Ws12cosθ By changing the above angle θ, a nonwoven fabric M having an arbitrary width (W≦Q) can be obtained. Therefore, there is no waste left in the nonwoven fabric product as in the past, and one spinneret 23 can be used to produce any width of nonwoven fabric, improving productivity and reducing costs. can contribute.

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. heater 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. Furthermore, since the angle θ is indicated by the pointer 51 on the angle display plate 49, confirmation of the angle θ becomes easy.

By the way, the support mechanism 48 for the spinneret plotter 9 and the exhaust port 60 is not limited to the above example,
Of course, a pond mechanism can be adopted as appropriate. If the ball bearing 37 is used as in the above example, 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 and outer ring 37B of the ball bearing 37 can be fitted with the balls 37C. Since a close connection relationship is maintained, 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 the 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.

It is preferable that the wind speed when passing through the mesh of the wire mesh belt 6 is in accordance with the specific volume of the nonwoven fabric to be obtained.

[Brief explanation of drawings]

FIG. 1, FIG. 2, and FIG. 3 are front sectional views showing an example of a melt-prone type spinning apparatus according to the present invention, respectively;
FIG. 4 is a side sectional view showing the structure of the spinneret Φ block, support mechanism, and surrounding areas in the same device; FIG. 5 and FIG. 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 view of the operation of the main parts of the apparatus. FIG. 9 is a plan view of the exhaust port, and FIG. 10 is a side sectional view of the exhaust port. 6... Nonwoven fabric collector, 9... Spinneret block, 26... Spinneret, 48...
Support mechanism, a...longitudinal direction (progressing direction), b...
・Width direction, θ...Angle. Patent applicant RiRa Shi Co., Ltd.

Claims (1)

[Claims] (1) A non-woven fabric collector having an endless belt-like ventilation hole that is propelled in the longitudinal direction, a slit-shaped exhaust port provided on the back side, and linearly arranged along the width direction of the non-woven fabric collector. and 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 pores and spinning it onto the nonwoven fabric collection body. In the apparatus, a support mechanism is provided for supporting the spinneret block at a variable angle in a plane parallel to the nonwoven fabric collector with respect to the width direction of the nonwoven fabric collector, and the slit-shaped exhaust port is 1. A melt-prone type spinning device, characterized in that a support mechanism is provided that supports the spinning head at a variable angle so that the direction is parallel to the arrangement direction of the spinnerets.