JP2003193362A - Method for producing three-dimensional nonwoven fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To readily remove a three-dimensional nonwoven fabric from a mold by partially releasing close contact of the three-dimensional nonwoven fabric to the forming face of the mold. <P>SOLUTION: This method for producing the three-dimensional nonwoven fabric by spinning a fiber in a semi-molten state on the forming face of the mold comprises forming a three-dimensional nonwoven fabric, deforming the mold so that a space is formed between the three-dimensional nonwoven fabric and the forming face of the mold and removing the three-dimensional nonwoven fabric from the mold. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for producing a three-dimensional nonwoven fabric by spinning a semi-molten fiber on a mold to form a three-dimensional nonwoven fabric.

[0002]

2. Description of the Related Art As a related art related to this, there is a method for manufacturing a three-dimensional nonwoven fabric described in Japanese Patent Application Laid-Open No. 49-100374, and FIG. 8 is a side view of a manufacturing apparatus used for carrying out the method. It is shown. The three-dimensional nonwoven fabric manufacturing apparatus 90 includes a chain conveyor 91, and a plurality of product-shaped molds 94 are mounted on the conveyor 91 in a state of being aligned in the traveling direction. Chain conveyor 91
A spinning nozzle 9 for spinning out a semi-molten fiber F above
6 is installed, and a spray gun 97 for a binder and a heating furnace 98 for drying are installed on the downstream side of the spinning nozzle 96.

When a constant amount of fiber F is spun from the spinning nozzle 96 while the chain conveyor 91 is driven at a constant speed, the fiber F having a substantially constant thickness is formed on the molding surface 94f of the mold 94.
Are stacked. Further, the binder is sprayed on the laminated fibers F, and the fibers F are dried together with the binder in the heating furnace 98, so that the laminated fibers F are bonded to each other to form the three-dimensional nonwoven fabric FC in a product shape. The three-dimensional nonwoven fabric FC is removed from the molding surface 94f of the mold 94, and unnecessary portions are cut off to form a product.

[0004]

However, in the above method, the three-dimensional nonwoven fabric F covering the molding surface 94f of the mold 94 is used.
Since C has to be removed so as to be peeled off from the molding surface 94f, there is a problem that the removal of the three-dimensional nonwoven fabric FC is troublesome. The present invention has been made in view of the above problems, and an object of the present invention is to facilitate removal of a three-dimensional nonwoven fabric from the molding surface of a mold.

[0005]

The above-mentioned problems can be solved by the inventions of the respective claims. The invention of claim 1 is a method for producing a three-dimensional nonwoven fabric, in which semi-molten fibers are spun on a molding surface of a mold to form a three-dimensional nonwoven fabric. After the three-dimensional nonwoven fabric is formed, the three-dimensional nonwoven fabric and the mold are formed. The mold is deformed so that a space is formed between the mold surface and the three-dimensional nonwoven fabric is removed from the mold.

According to the present invention, since the mold is deformed so that a space is formed between the three-dimensional nonwoven fabric and the molding surface of the mold, the sticking of the three-dimensional nonwoven fabric to the molding surface of the mold is partially released. The three-dimensional non-woven fabric is easily released from the mold. Therefore, the three-dimensional nonwoven fabric can be easily removed from the mold.

Further, as set forth in claim 2, a plurality of mold pieces are partially overlapped to form a mold, and the mold pieces are slid relative to each other so that the three-dimensional nonwoven fabric and the molding surface of the mold are formed. The structure of the mold is simplified if the mold is deformed so that a space is formed.

According to a third aspect of the present invention, a mold is formed by a variable member that is held in a constant shape by applying an external force, and the external force is removed so that a space is formed between the three-dimensional nonwoven fabric and the molding surface of the mold. If the mold is deformed so that a space is formed, the three-dimensional nonwoven fabric can be more easily removed. In this case, as in claim 4, the variable member may be held in a constant shape by the pressure of the fluid to form the mold, or as in claim 5, the variable member may be fixed by the supporting force of the supporting jig. The mold may be formed by holding the shape.

Further, as described in claim 6, a part of the molding surface of the mold may be projected so that a space is formed between the three-dimensional nonwoven fabric and the molding surface of the mold. As shown in FIG. 7, the convex portion provided on the molding surface of the mold may be retracted so that a space is formed between the three-dimensional nonwoven fabric and the molding surface of the mold.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) Hereinafter, FIG. 1 and FIG.
Based on the description, the method for manufacturing the three-dimensional nonwoven fabric according to Embodiment 1 of the present invention will be described. The present embodiment relates to a method of manufacturing a filter as an example of a three-dimensional nonwoven fabric, and FIG. 1 is a perspective view of a mold used in the method of manufacturing the filter. Further, FIG. 2 is a schematic perspective view (FIG. A) and a vertical cross-sectional view (FIG. B) showing filter manufacturing equipment. Here, the following description will be made assuming that the width direction of the manufacturing equipment is the X direction, the front-back direction is the Y direction, and the height direction is the Z direction. As shown in FIG. 2, the filter manufacturing facility 1 includes a horizontal conveyor 2 on which a plurality of filter molding dies 1 are provided.
0s (only one is shown in FIG. 2) are placed in the order.

A spinning nozzle 4 is installed at a predetermined position above the conveyor 2. The spinning nozzle 4 is, for example, a nozzle that uses a melt blow method, and uses a fibrous resin F (hereinafter, referred to as a fiber F) injected from an extruder (not shown) to form molding portions 14 and 17 and peripheral portions of the filtering portion of the mold 10. The molding surfaces 13 and 16 are spun. The fiber F spun from the spinning nozzle 4 is in a semi-molten state, and the fiber F is laminated on the filtering part molding surfaces 14 and 17 and the peripheral part molding surfaces 13 and 16 so that the contact portions melt each other. It becomes a non-woven fabric when worn.

As shown in FIG. 1B, the filter molding die 10 is formed by stacking a right die piece 12 and a left die piece 15 together. The right mold piece 12 includes a rectangular frame portion 13 having a constant width, and a right mold body portion 14 is formed inside the rectangular frame portion 13. The right mold main body portion 14 includes a bellows portion 14w having a shape in which side surface substantially triangular ridges are continuous,
It is configured by a triangular side plate portion 14s that closes the right end surface of the bellows portion 14w. The bellows part 14w
The left end surface 14c of is held in an open state.

The left die piece 15 is provided with an edge portion 16 having a constant width and formed in a U-shape in a plane, and a left die body portion 17 is formed inside the edge portion 16. The left type main body portion 17 is a bellows portion 1 having a shape in which mountains having substantially triangular side surfaces are also continuous.
7w, and a triangular side plate portion 17s that closes the left end surface of the bellows portion 17w.
The right end surface 17c of w is open. Left and right mold pieces 12,
The vertical cross-sectional dimensions of the bellows portions 14w and 17w in 15 are set to the same value so that the left and right mold pieces 12 and 15 can be overlapped with each other.

In the mold 10 for molding a filter, the right mold body portion 14 of the right mold piece 12 and the rectangular frame portion 13 are overlapped with the left mold body portion 17 of the left mold piece 15 and the edge portion 16, respectively. It is molded into the same shape as the filter (not shown). That is, the left mold body portion 17 of the left mold piece 15 and the right mold body portion 14 of the right mold piece 12 function as a filtering portion molding surface that forms the filtering portion of the filter, and the edge portion 16 of the left mold piece 15 is The rectangular frame portion 13 of the right mold piece 12 functions as a peripheral edge molding surface that forms the peripheral edge of the filter. Therefore, the left mold body portion 17 of the left mold piece 15 and the right mold body portion 14 of the right mold piece 12 are hereinafter referred to as filtering portion molding surfaces 14 and 17,
The edge portion 16 of the left mold piece 15 and the rectangular frame portion 13 of the right mold piece 12 are hereinafter referred to as peripheral edge molding surfaces 12 and 16.

With the left mold piece 15 superposed on the right mold piece 12,
Both mold pieces 12 and 15 are configured to be relatively slidable in the width direction (X direction). Therefore, as shown in FIG. 1 (A), by increasing the area of the overlapping portion of the right mold piece 12 and the left mold piece 15, the molding surfaces 13, 14, 16,
The width of 17 can be reduced. Further, as shown in FIG. 1 (C), by reducing the area of the overlapping portion of the right mold piece 12 and the left mold piece 15, the molding surfaces 13, 1 of the mold 10 are reduced.
The width of 4, 16 and 17 can be widened. When the mold 10 is formed, the rectangular frame portion 13 of the right mold piece 12 and the left mold piece 15 are formed.
The edge 16 is fixed by a clip or the like (not shown) and is held so as not to be displaced.

The mold 10 is formed of a breathable metal net or resin net. Here, when the mold 10 is formed of a resin net or the like, a mold release agent is applied to the mold 10 in order to prevent the fiber F and the mold 10 from adhering to each other. Note that in FIG. 1, for simplification of the drawing, the bellows portion 14w having four ridges,
Although 17w is illustrated, the actual number of peaks can be set to any value.

Next, a method of manufacturing the filter will be described. First, a plurality of molds 10 having a predetermined width dimension are set on the conveyor 2. Next, a substantially constant amount of fibers F are spun from the spinning nozzle 4, and the conveyor 2 is driven at a constant speed. As a result, the mold 10 moves under the spinning nozzle 4 at a constant speed, and as shown in FIG. 2B, the filtering part molding surfaces 14 and 17 and the peripheral part molding surfaces 13 and 16 of the mold 10 are moved in the Y direction. Fibers F in a semi-molten state are laminated in order from the front end side (left end in the figure) in a substantially constant thickness.

The fibers F laminated on the filtering portion molding surfaces 14 and 17 of the mold 10 and the fibers F laminated on the peripheral edge molding surfaces 13 and 16 become non-woven fabric by fusing their contact portions to each other. Then, the non-woven fabric made of the fibers F laminated on the filtering part molding surfaces 14 and 17 constitutes the filtering part of the filter. Further, the nonwoven fabric made of the fibers F laminated on the peripheral edge molding surfaces 13 and 16 serves as the peripheral edge of the filter.

When the filter is formed in this way,
The clip of the mold 10 is removed, and the right mold piece 12 is replaced with the left mold piece 15.
The mold 10 is moved in the direction of narrowing the width. As a result, the inner wall surface of the filter and the side plate portion 14s of the right mold piece 12
A space (not shown) is formed between and. In this state, the filter is removed from the mold 10. The filter removed from the mold 10 is completed by cutting off unnecessary parts.

According to the method of manufacturing the filter of this embodiment, after the filter is formed, the mold 10 is formed so that a space is formed between the filter and the molding surface (side plate portion 14s) of the mold 10. Forming surface 1 of mold 10 for deformation
The sticking of the inner wall surface of the filter to 4, 17 and the like is partially released, and the filter easily comes off the mold 10. Therefore, the filter can be easily removed from the mold 10. Further, the left and right mold pieces 12 and 15 are overlapped with each other to form the mold 10.
Is formed and the mold pieces 12 and 15 are slid to deform the mold. Therefore, the structure of the mold 10 is simple and cost effective.

In this embodiment, the mold 10 is composed of a pair of mold pieces 12 and 15, but as shown in FIG. 3, two pairs of mold pieces 12a, 12b, 15a and 15b or more are used. You may comprise from the mold piece. Also, the mold piece 1
Although the example in which the bellows portions 14w and 17w of 2 and 15 are formed to have a triangular cross section is shown, they may be formed to have a semicircular or polygonal cross section.

(Embodiment 2) A method for manufacturing a three-dimensional nonwoven fabric according to Embodiment 2 of the present invention will be described below with reference to FIG. In this embodiment, a mold having a structure different from that of the mold 10 used in the first embodiment is used, and the method for removing the three-dimensional nonwoven fabric is changed. Mold 20 used in this embodiment
As shown in FIGS. 4 (B) and 4 (D), is equipped with an upper open type pressure vessel 22. The pressure container 22 has a flange portion 22e formed on the periphery of the opening 22m.
2m and the flange portion 22e has a certain thickness, for example, a rubber plate 2
6 is covered. Further, a flat plate-shaped shape fixing frame 28 is superposed on the rubber plate 26.

The edge of the shape-fixing frame 28 has a flange portion 22 of the pressure vessel 22 by a clamp member (not shown).
It is fixed to e. As a result, the edge of the rubber plate 26 is
The edge of the shape fixing frame 28 and the flange portion 22 of the pressure vessel 22
It is sandwiched between e and e and is fixed at the position of the flange portion 22e. At the predetermined position on the shape fixing frame 28,
For example, a plurality of circular through holes 28k are formed.
A pressure pump 24 is connected to the pressure container 22. The pressurizing pump 24 may be an air pump or a hydraulic pump.

When the mold 20 is used, the pressure pump 2
At 4, the internal space of the pressure vessel 22 is pressurized. As a result, the rubber plate 26 is elastically deformed by the pressure, and as shown in FIG.
It projects in a hemispherical shape from 8k. That is, a plurality of hemispherical protrusions 26h are formed on the surface of the mold 20 at predetermined positions. Here, the height dimension of the protrusion 26h can be adjusted by adjusting the pressure in the pressure container 22.

The surface of the mold 20 is used as a molding surface 28f, and the semi-molten fiber F spun from the spinning nozzle 4 is laminated on the molding surface 28f to form a three-dimensional nonwoven fabric having hemispherical protrusions. Can be formed. When removing the three-dimensional nonwoven fabric from the molding surface 28f of the mold 20, the pressure inside the pressure vessel 22 is made equal to the atmospheric pressure. As a result, the rubber plate 26 is restored to a flat plate shape and the protrusion 26h is eliminated, and a plurality of hemispherical spaces are formed between the inner wall surface of the three-dimensional nonwoven fabric and the molding surface 28f of the mold 20. As a result, the three-dimensional nonwoven fabric is easily separated from the molding surface 28f of the mold 20.

Here, in this embodiment, an example in which the pressure vessel 22 is pressurized by the pressure pump 24 has been shown, but the shape fixing frame 28 and the rubber plate 26 are exchanged and the pressure vessel 22 is decompressed by the pressure reduction pump. It is also possible to do so. By decompressing the inside of the pressure container 22, a part of the rubber plate 26 is fixed to the shape fixing frame 2.
8 is recessed into a hemispherical shape at the position of the through hole 28k to form a molding surface having a plurality of recesses. Therefore, by using this mold, it becomes possible to form a three-dimensional nonwoven fabric having hemispherical protrusions. When removing the three-dimensional nonwoven fabric from the molding surface of the mold, the pressure in the pressure container 22 is made equal to the atmospheric pressure. As a result, the three-dimensional nonwoven fabric can be pushed away from the molding surface of the mold by the restoring force of the rubber plate 26.

In this embodiment, the rubber plate 26 is elastically deformed to form the protrusions 26h and the recesses on the molding surface 28f. However, instead of the rubber plate 26, a bag having protrusions 26h or the like can be used. It is also possible to use the provided sheet. That is, if the position of the bag of the sheet and the position of the through hole 28k of the shape fixing frame 28 are made to coincide with each other, the molding surface 28f can be formed by pressurizing or depressurizing the inside of the pressure container 22.
It is possible to form the protrusion 26h and the recess. The sheet may or may not be an elastic body. That is, the rubber plate 26 and the sheet correspond to the variable member of the present invention.

(Embodiment 3) A method for manufacturing a three-dimensional nonwoven fabric according to Embodiment 3 of the present invention will be described below with reference to FIG. In this embodiment, a mold having a structure different from that of the mold 20 used in the second embodiment is used, and the method for removing the three-dimensional nonwoven fabric is changed. Mold 30 used in this embodiment
As shown in FIG. 5A, is composed of a shape fixing frame 32, a rubber plate 34, and a support jig 36.

The shape-fixing frame 32 includes a frame portion 32w formed in a rectangular shape having a substantially constant width, and a plurality of horizontal rails 32b that are equally spaced in the width direction (X direction) of the frame portion 32w. Is formed in. Further, the rubber plate 34 is used for the shape fixing frame 3
The rubber plate 34 has a size substantially the same as that of the rubber plate 34.
Is fixed to the frame portion 32w of the shape fixing frame 32 by a clamp or the like (not shown).

As shown in FIG. 5 (B), the support jig 36 is a jig for pushing out the rubber plate 34 from between the horizontal rails 32b of the shape fixing frame 32, and includes a substrate 36p and a plurality of pressing rods 36m. It is configured. The substrate 36p is formed to have substantially the same size as the shape fixing frame 32, and a gate-shaped pressing rod 36m is provided upright on the substrate 36p. The pressing rods 36m are arranged on the substrate 36p in such a manner that the edge of the substrate 36p is overlapped with the frame portion 32w of the shape fixing frame 32, and each pressing rod 3m is placed.
It is set so that 6 m is arranged in the center between the horizontal rails 32b.

When the mold 30 is formed, the rubber plate 34 and the shape fixing frame 32 are covered on the supporting jig 36, and the rubber plate 3 is formed.
4 and the frame portion 32w of the shape fixing frame 32 to the supporting jig 3
6 to the edge of the substrate 36p. As a result, each pressing rod 36m of the support jig 36 presses the rubber plate 34, and the portions other than the edges of the rubber plate 34 are fixed to the shape fixing frame 32.
It is extruded from between the horizontal rails 32b (see FIG. 5B). That is, the rubber plate 34 is pushed up by the pressing rod 36m while being pressed by the horizontal rail 32b from above, and thus is deformed into a bellows shape.

Then, in a state where the frame portion 32w of the shape fixing frame 32 is overlapped with the end edge of the substrate 36p of the support jig 36 via the rubber plate 34, the frame portion 32w of the shape fixing frame 32 is clamped ( (Not shown) is fixed to the edge of the substrate 36p. Thereby, as shown in FIG. 5C, the mold 30 is formed, and the frame portion 32w of the shape fixing frame 32 is formed.
The bellows portion of the rubber plate 34 serves as the molding surface 34f.

When the three-dimensional nonwoven fabric formed by using the mold 30 is removed from the molding surface 34f of the mold 30, the clamp member is removed and the supporting jig 36 is removed from the mold 30. As a result, the rubber plate 34 is restored from the bellows shape to the flat plate shape.
A space having a substantially triangular prism shape is formed between the molding surface 34f and the molding surface 34f. As a result, the three-dimensional nonwoven fabric is easily separated from the molding surface 34f of the mold 30.

In the present embodiment, the example in which the bellows-shaped molding surface 34f is formed by elastically deforming the rubber plate 34 has been shown, but a sheet can be used instead of the rubber plate 34. That is, by pressing the sheet from below with the pressing rod 36m of the support jig 36, it is possible to form the bellows-shaped forming surface 34f. The sheet may or may not be an elastic body. That is, the rubber plate 34 and the sheet correspond to the variable member of the present invention.

(Embodiment 4) Hereinafter, a method for producing a three-dimensional nonwoven fabric according to Embodiment 4 of the present invention will be described with reference to FIGS. 6 and 7. In this embodiment, a mold having a structure different from that of the mold 30 used in the third embodiment is used, and the method for removing the three-dimensional nonwoven fabric is changed. As shown in FIG. 6A, the mold 40 used in this embodiment is composed of a mold body 43 and an extrusion jig 45.

The mold body 43 is composed of a flat plate-shaped substrate 43b and a plurality of truncated cone-shaped convex portions 43t formed at predetermined positions on the surface of the substrate 43b. A through hole 43f is formed in the substrate 43b at a position corresponding to the center of the convex portion 43t, and the through hole 4 is formed on the upper surface of the convex portion 43t.
An upper through hole 43h is formed at the same position as 3f. The push-out jig 45 includes a base 45b having the same shape as the substrate 43b of the die body 43, and push-out pins 45p are provided upright on the upper surface of the base 45b.

The push-out pin 45p is formed on the substrate 4 of the mold body 43.
The through hole 43f of 3b and the upper through hole 43h of the convex portion 43t.
Is positioned at a position corresponding to the through hole 43.
f and the upper through hole 43h. Further, the length of the push-out pin 45p is such that the tip portion of the push-out pin 45p has a predetermined size when the base 45b of the push-out jig 45 is in contact with the substrate 43b of the die body 43 (see FIG. 6C). It is formed so as to project from the upper through hole 43h of the convex portion 43t.

Between the die body 43 and the pushing jig 45,
Substrate 43b of mold body 43 and base 45 of extrusion jig 45
A spacer (not shown) that separates b from the same size
Is installed. In this state, the tip of the push-out pin 45p is held at the same height as the upper surface of the convex portion 43t to form the mold 40, as shown in FIG. 6 (B). That is, the upper surface of the mold body 43 serves as the molding surface of the mold 40 while the tip of the push-out pin 45p is held at the same height as the upper surface of the convex portion 43t. That is, the tip of the push pin 45p corresponds to a part of the molding surface of the mold of the present invention.

A three-dimensional nonwoven fabric F formed by the mold 40
When removing C from the molding surface of the mold 40,
As shown in (C), the spacer is removed and the base 45b of the pushing jig 45 is brought into contact with the substrate 43b of the mold body 43. As a result, the tip portion of the push-out pin 45p projects from the upper through hole 43h of the convex portion 43t by a predetermined dimension,
The three-dimensional nonwoven fabric FC is separated from the molding surface of the mold 40. As a result, the three-dimensional nonwoven fabric FC easily comes off the molding surface of the mold 40.

Further, as shown in FIG. 7, a plurality of through holes 5
As shown in FIG. 7B, the upper flat plate 52 having 2h formed at a predetermined position and the lower flat plate 54 having the convex portion 54t formed at the positions corresponding to the through holes 52h are overlapped with each other, as shown in FIG.
The mold 5 in which the convex portion 54t protrudes from the upper surface 52u of the upper flat plate 52.
You may form 0. When removing the three-dimensional nonwoven fabric FC formed by the mold 50 from the molding surface of the mold 40,
As shown in FIG. 7C, the lower flat plate 54 is separated from the upper flat plate 52, and the convex portion 54t is retracted from the upper surface 52u of the upper flat plate 52. Thereby, the convex portion 54t is separated from the inner wall surface of the three-dimensional nonwoven fabric FC, and the three-dimensional nonwoven fabric FC is easily separated from the molding surface of the mold 50.

In Embodiments 1 to 4, a filter has been described as an example of a three-dimensional nonwoven fabric, but it is possible to use a three-dimensional nonwoven fabric as a cushioning material or a sound absorbing material other than the filter.

Among the inventions described in Embodiments 1 to 4, the inventions not described in the claims are listed below. (1) The method for producing a three-dimensional nonwoven fabric according to claim 3, wherein an elastic body is used as the variable member. (2) The method for producing a three-dimensional nonwoven fabric according to claim 3, wherein a sheet is used as the variable member. (3) The method for manufacturing a three-dimensional nonwoven fabric according to claim 7, wherein an upper flat plate having a plurality of through holes formed at predetermined positions, and a lower flat plate having convex portions formed at positions corresponding to the through holes. By forming a mold in which the convex portion protrudes from the upper surface of the upper flat plate, and after forming a three-dimensional nonwoven fabric, removing the lower flat plate and retracting the convex portion from the upper surface of the upper flat plate. And a method for producing a three-dimensional nonwoven fabric.

[0043]

According to the present invention, since the sticking of the three-dimensional nonwoven fabric to the molding surface of the mold is partially released, the three-dimensional nonwoven fabric is easily separated from the mold.

[Brief description of drawings]

FIG. 1 is an overall perspective view (FIG. A) of a mold used in a method for manufacturing a three-dimensional nonwoven fabric (filter) according to a first embodiment of the present invention,
Exploded perspective view (FIG. B) and general perspective view in an expanded state (C
Figure).

FIG. 2 is a schematic perspective view showing a filter manufacturing facility (FIG. A).
FIG. 3B is a vertical cross-sectional view of a main part (FIG. B).

FIG. 3 is an exploded perspective view (FIG. A) and an overall perspective view (FIG. B) showing a modified example of a mold.

FIG. 4 is a perspective view (FIG. A) showing a standby state of a mold used in the method for manufacturing a nonwoven fabric according to the second embodiment of the present invention, a side view (FIG. 4), a perspective view (C view) of a used state, and Cross-sectional view (D
Figure).

FIG. 5 is an exploded perspective view (FIG. A) and a vertical sectional view (FIG. B) of a mold used in the method for manufacturing a nonwoven fabric according to the third embodiment of the present invention.
FIG. 3 is an overall perspective view (FIG. C).

FIG. 6 is an exploded perspective view (FIG. A) of a mold used in a method for manufacturing a nonwoven fabric according to a fourth embodiment of the present invention, and a longitudinal sectional view of a main part (B).
Fig., Fig. C).

7A and 7B are an exploded perspective view (FIG. A), an overall perspective view (FIG. B), and a longitudinal cross-sectional view of a main part (FIG. C) showing a modified example of a mold.

FIG. 8 is a side view showing a conventional filter manufacturing method.

[Explanation of symbols]

4 spinning nozzles Type 10 12 Right mold piece 15 Left mold piece Type 20 26 Rubber plate (variable member) Type 30 34 Rubber plate (variable member) 36 Support jig Type 40 45p extrusion pin 50 type 54t convex part

Claims (7)

[Claims] 1. A method for producing a three-dimensional nonwoven fabric by spinning semi-molten fibers on a molding surface of a mold to form a three-dimensional nonwoven fabric, which comprises forming a three-dimensional nonwoven fabric, and forming the three-dimensional nonwoven fabric and the molding surface of the mold. A method for producing a three-dimensional nonwoven fabric, characterized in that the mold is deformed so that a space is formed between the mold and the mold, and the three-dimensional nonwoven fabric is removed from the mold. 2. The method for producing a three-dimensional nonwoven fabric according to claim 1, wherein a plurality of mold pieces are partially overlapped to form a mold, and the mold pieces are slid relative to each other to form a three-dimensional nonwoven fabric and the mold. A method for producing a three-dimensional nonwoven fabric, characterized in that the mold is deformed so that a space is formed between the mold surface and the molding surface. 3. The method for producing a three-dimensional nonwoven fabric according to claim 1, wherein a mold is formed by a variable member that is held in a constant shape by applying an external force, and the external force is removed to remove the three-dimensional nonwoven fabric and the mold. A method for producing a three-dimensional nonwoven fabric, which comprises deforming the mold so that a space is formed between the molding surface and the molding surface. 4. The method for producing a three-dimensional nonwoven fabric according to claim 3, wherein the variable member is held in a constant shape by the pressure of the fluid to form a mold. 5. The method for producing a three-dimensional nonwoven fabric according to claim 3, wherein the variable member is held in a constant shape by the supporting force of the supporting jig to form a mold. 6. The method for producing a three-dimensional nonwoven fabric according to claim 1, wherein a part of the molding surface of the mold is projected so that a space is formed between the three-dimensional nonwoven fabric and the molding surface of the mold. And a method for producing a three-dimensional nonwoven fabric. 7. The method for producing a three-dimensional nonwoven fabric according to claim 1, wherein a convex portion provided on the molding surface of the mold is formed so that a space is formed between the three-dimensional nonwoven fabric and the molding surface of the mold. A method for producing a three-dimensional nonwoven fabric, which is characterized in that it is retracted.