JP2003239200A - Method for producing three-dimensional fiber molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a bulky three-dimensional fiber molded product having an outer surface with the shape to which the inner surface shape of a mold is transferred well by using one mold. <P>SOLUTION: A composition containing water and a surfactant is bubbled by adding an external force so as to have ≥20 vol.% bubble content, and fibers are dispersed so as to have 10-70 wt.% fiber content to provide a fiber- containing foam. The interior of the mold 13 is charged with the fiber-containing foam, and the fiber-containing foam is dried in 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 bulky fiber molding having a three-dimensional shape.

[0002]

2. Description of the Related Art As a prior art relating to a method for producing a bulky three-dimensional fiber molding,
For example, the technique described in Japanese Patent Laid-Open No. 4-245965 is known. In this technique, crimped hollow fiber short fibers and hollow core-sheath composite fiber short fibers are mixed to form a fiber web by a dry method, and then the fiber webs are laminated to each other to give a predetermined composition. A fiber entangled nonwoven fabric having a predetermined thickness is formed by a fiber entanglement means, heat treatment is applied to the fiber entangled nonwoven fabric to fuse and fix the fibers together, and finally a hot press process is applied to give a predetermined shape. .

By the way, this technique requires many steps of mixing fibers, forming a fiber web, laminating fiber webs, forming a fiber entangled non-woven fabric, fusion fixing of fibers by heat treatment, and hot pressing. It was time-consuming. Further, since the shape is applied by hot pressing, it is difficult to obtain a bulky molded body having a complicated shape.
Further, since the fiber entangled nonwoven fabric obtained by laminating the fibrous webs and undergoing a predetermined process is used, it is necessary to increase the number of layers to obtain a molded product having a height. In addition, since the fiber-entangled nonwoven fabric in which the fiber webs are laminated is entangled with each other and heat-bonded, a difference in density and the like easily occurs between the boundary portion and the inside, so that a molded body in which the fibers are uniformly dispersed I couldn't get it.

On the other hand, as a method for producing a non-woven fibrous web,
The technique described in Japanese Patent Application Laid-Open No. 61-12996 is known. This technique includes water and a surfactant of 55-75.
0.3-1.2% by weight in a foaming liquid containing volume% air
To form a foamed fiber furnish which is fed to the moving perforated support web forming means without substantially adding turbulence or agitation to the web formation. Air is taken into the foaming liquid passing through the web forming means.

However, according to this technique, when fibers are added to the foaming liquid in an amount of more than 1.2% by weight, the fibers are likely to aggregate and aggregate into agglomerates. It was not possible to increase the fiber content of the foamable liquid because it was torn during the production or the obtained web shape had unevenness in physical properties such as thickness and density. Moreover, even if a mold having a three-dimensional cavity is filled with a foamed fiber furnish having a fiber content of 0.3 to 1.2% by weight, the shape retention is poor because the amount of fibers is too small, and the cavity can be handled. It was difficult to obtain a three-dimensional fiber molding having the above-mentioned form.

Further, as a method for producing a tubular pulp foam, a technique described in JP-A-7-3069 is known. In this technique, pulp containing recycled pulp, water, a surfactant and a thickener are kneaded and foamed, and the mixture is filled into a mold having a tubular space while holding the foam, and solidified. After being formed into a tubular shape, it is dehydrated if necessary and then heat-dried or freeze-dried to form a tubular pulp molded body.

However, according to this technique, since the kneaded product is solidified as a composition and then dehydrated and dried, even if the kneaded product is filled in the mold, the inner surface of the mold is contracted due to shrinkage during drying. It has been difficult to obtain a bulky three-dimensional fiber molded body in which the shape is sufficiently transferred.

Therefore, an object of the present invention is to provide a solid fiber molding capable of easily producing a bulky solid fiber molding in which the inner surface shape of the mold is transferred to the outer surface of the molded body by one mold. It is to provide a method for manufacturing a body.

[0009]

Means for Solving the Problems The present inventors have found that even when the fiber content is increased by filling the mold with a high bubble content rate and a high fiber content rate and molding. It has been found that fibers are uniformly dispersed in the contained foam, high fluidity is maintained, and a bulky three-dimensional fiber molded product having high moldability (shape transfer property of the inner surface of the mold) is obtained.

The present invention was made on the basis of the above-mentioned findings. An external force was applied to a composition containing water and a surfactant to foam the composition so that the bubble content was 20 vol% or more, and then the composition was foamed. The composition has a fiber content of 10 to 70 wt.
A method is provided for producing a three-dimensional fiber molded body in which fibers are dispersed to obtain a fiber-containing foam in an amount of 0.1%, the fiber-containing foam is filled in a mold, and then the fiber-containing foam is dried in the mold. It is a thing.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described based on its preferred embodiments with reference to the drawings.

In the method for producing a three-dimensional fiber molding of the present invention, first, a composition containing water and a surfactant is prepared. The amount of the surfactant added is preferably 0.1 to 20 wt% and more preferably 0.5 to 10 wt% so that foaming with a bubble content described later can be obtained. The surfactant may be anionic, cationic, amphoteric,
The nonionic surfactant can be appropriately selected according to the application such as antistatic (prevention of adhesion of dust due to electrification) and suppression of chemical reaction such as gelation, and can be used alone or in combination. Examples of the anionic surfactant include fatty acid salt, alkyl sulfate ester salt, polyoxyethylene alkyl ether sulfate ester salt, and the like. As the cationic surfactant, an alkyl amine salt,
Examples of the amphoteric surfactant include alkyl betaine and amine oxide, and examples of the nonionic surfactant include glycerin fatty acid ester and polyethylene alkyl ether. Of these, anionic surfactants are particularly preferable because they have good foaming power.

If necessary, additives such as a thickener, a foam stabilizer, a foaming agent and a dispersant can be added to the above composition without any particular limitation. The compounding amount of the additive in the composition can be appropriately set according to the additive to be added. Examples of the thickener include starch, natural polysaccharides such as carboxymethyl cellulose and / or processed products thereof, synthetic alcohols such as polyvinyl alcohol (PVA), polyethylene glycol, polyethylene oxide, polyacrylic amide, and polyamine. Among these, PVA is preferably used from the viewpoint that a binder can be obtained at the same time, and polyethylene oxide and polyacrylic amide are preferably used from the viewpoint that sufficient thickening can be obtained even with a small amount of addition.

Next, an external force is applied to the composition so that the bubble content is 20 vol% or more, preferably 40 vol% or more,
Most preferably, foaming is performed so as to be 80 vol% or more. When the cell content is less than 20 vol%, the cells are easily moleculed with water, which makes it difficult to form a uniform fiber-containing foam. Here, the bubble content rate (%) of the composition is a value calculated by (composition volume after foaming-composition volume before foaming) × 100 / (composition volume after foaming). is there.

The bubbles are preferably fine because they can be uniformly attached to the surface of the fiber and the moldability can be improved.

The method of foaming the composition by applying an external force is not particularly limited. As the method, for example, after containing the composition in a container such as a tank,
A method of stirring and foaming the composition with a stirring device equipped with a stirring blade, a method of attaching a vibrator to the container and vibrating the vibrator at a predetermined frequency to foam, and air etc. directly in the composition The method of supplying the gas of bubbling and bubbling to foam, the method of generating fine bubbles by depressurization, the method of chemical reaction, and the like are mentioned. From the viewpoint of ease of operation, stirring or a method of supplying gas into the composition and bubbling to foam is particularly preferable.

Next, fibers are dispersed in the foamed composition so that the fiber content is 10 to 70 wt% to obtain a fiber-containing foam. If the fiber content is less than 10 wt%, the amount of the fiber-containing foam necessary for obtaining a molded product becomes too large, which makes it difficult to handle, and it may take too long to dry due to an increase in water content. When it exceeds, the bubbles existing between the fibers are reduced, and the frictional force between the fibers becomes too large, so that the fluidity of the fiber-containing foam may decrease. The fiber content is 20 to 5
It is more preferably 0 wt%.

The fibers have an average fiber length of 0.1 to 50 m.
It is preferable to use the one having a diameter of m, more preferably 1 to 20 mm. If the average fiber length is too short, the bonds between the fibers are poor, and the moldability may be poor, or a molded product with the desired strength may not be obtained, and if the average fiber length is too long, the fiber-containing foam may be entangled with each other. Liquidity may decrease.

The fibers include natural fibers or synthetic fibers,
It can be appropriately selected depending on the use and form of the three-dimensional fiber molded product to be produced and the manufacturing conditions of the three-dimensional fiber molded product. Examples of the fibers include plant fibers (cotton, cabot, wood pulp, non-wood pulp, peanut protein fiber, corn protein fiber, soy protein fiber, mannan fiber, rubber fiber, hemp, manila hemp, sisal hemp, as natural fiber. New Zealand hemp, Rafu, palm, igusa, straw, etc.), animal fiber (wool, goat hair, mohair, cashmere,
Alcapa, Angola, camel, vicuna, silk,
Feather, down, feather, algin fiber, chitin fiber,
Examples of synthetic fibers include semi-synthetic fibers (acetate, triacetate, oxidized acetate, promix, chlorinated rubber, hydrochloric acid rubber, etc.), synthetic polymer fibers (nylon). , Aramid, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyester such as polyethylene terephthalate, polyacrylonitrile, acrylic, polyethylene, polyethylene, polypropylene, polystyrene, polyurethane, rayon, viscose rayon, cupra), metal fiber, inorganic fiber (Carbon fiber, glass fiber, etc.)
Etc.

Of these, it is preferable to use fibers having hydrophobicity on the surface, because the destruction of bubbles due to absorption of water can be suppressed and uniform dispersibility in the fiber-containing foam can be maintained. In addition, the bulkiness (reduction in density) of the obtained three-dimensional fiber molded product, and the fact that the shape retention of the three-dimensional fiber molded product obtained by heat-sealing the fibers by heating and drying can be enhanced, are thermoplastic. It is preferable to use fibers. Preferred hydrophobic and thermoplastic fibers include, for example, polyvinyl alcohol fibers, polyvinylidene chloride fibers, polyester fibers, polyolefin fibers, polyether ester fibers, and polyurethane fibers. These fibers can be used alone or in combination of two or more, and the recovered and reused products of these fibers can also be used. As the fibers, bulky fibers having a crimped shape or a curved shape can be used. By using such fibers, the molded product obtained by filling the fiber foam in the mold can suppress shrinkage during the manufacturing process, and further, a bulky molded product can be obtained.

The method for dispersing the fibers in the foamed composition can be appropriately selected depending on the use and form of the obtained molded product and the form of the fibers. Examples of the method for dispersing the fibers include, for example, a method in which the foamed composition is further stirred and foamed while a predetermined amount of the fibers is gradually added, and the fibers are added to the composition foamed in a predetermined volume. Examples thereof include a method in which the above-mentioned fiber-containing foam is obtained while adding and mixing at once and maintaining a predetermined volume. In this way, by foaming the composition with a high bubble content in advance and then dispersing the fibers, a state in which a large number of fine bubbles are filled between the fibers can be obtained, and a high bubble content can be maintained. In addition, the fibers can be uniformly dispersed.

In the fiber-containing foam, if necessary, an emulsion binder, a binder such as a hot-melt type powdery resin, a functional agent such as a deodorant, etc. may be added together with the fiber or after the fiber is dispersed. Various additives can be added. The compounding amount of the additive in the fiber-containing foam can be appropriately set according to the additive to be added.

Since the fiber-containing foam thus obtained has a structure in which a large number of fine cells are filled between the fibers, the state in which the cells and the fibers are uniformly dispersed is high even when the fiber content is high. It is obtained and its fluidity is maintained high.

Next, as shown in FIG. 1A, the filling port 1
The fiber-containing foam is filled through a filling port 10 into a metal mold 13 made up of a lid 11 having 0 and a mold body 12. As shown in FIG. 2, the mold frame 13 has a three-dimensional fiber molding 1 in which a plurality of protrusions 3 having a spherical roundness at the tip end project from the board surface of the substrate portion 2 which is oval in plan view. Has a filling space corresponding to the outer shape of. The shape of the protrusions 3 of the molded body 1 can also be formed in a cone shape (cone or pyramid shape) depending on the shape of the corresponding portion of the mold 13.

As shown in FIG. 1A, the form 13 has
In order to increase the density of the protrusions 3 by filling the recesses 13a corresponding to the protrusions 3 with the fiber-containing foam in every corner without gaps, the suction that has a substantially circular cross section from the inside of the mold 13 to the outside. The hole 14 is formed.

The cross-sectional area of the suction hole 14 is 0.1 to 2.0 m.
is preferably m ^2, and more preferably 0.5 to 1.0 mm ^2. If the suction holes 14 are too narrow, the suction of the fiber-containing foam may be weakened and the shape transferability may be deteriorated. If the suction holes 14 are too wide, the fiber-containing foam may come out of the suction holes or the shape of the opening of the suction holes may be reduced. It may be transferred to the surface of the three-dimensional fiber molding, and the appearance may be deteriorated.

The mold 13 is provided with a heater (heating means, not shown) inside thereof so that the mold 13 can be dried as it is after being filled with the fiber-containing foam. Also,
The inner surface of the mold 13 is treated with a fluororesin so that the dried three-dimensional fiber molding can be easily released.

As a method for filling the fiber-containing foam into the mold 13, a method of continuously pressurizing by using a pressure pump, or a negative pressure state in the mold 13 by sucking from a suction hole 14 of the mold 13 is used. Examples thereof include a method of introducing the fiber-containing foam into the mold, a method of simultaneously performing these, and the like. Among them, a predetermined amount of the fiber-containing foam can be uniformly injected into the mold 13, and the mold 13 From the viewpoint of excellent shape transferability of the inner surface of (1), a method of continuously applying pressure with a pressure feed pump and simultaneously sucking from the suction hole of the mold is preferable.

Then, the mold 13 is filled while suctioning with negative pressure through the suction holes 14, or is once suctioned with negative pressure through the suction holes 14 and is filled in a portion corresponding to the protrusion 3, and the substrate portion 2 1 is replenished with the reduced volume, and as shown in FIG. 1B, the filling space of the mold 13 is filled without any gap. The suction through the suction holes 14 can be performed with a uniform pressure or with different strength depending on the density (bulkness) and mechanical strength of the obtained three-dimensional fiber molded body.

Next, the mold 13 is heated by the heater, and the fiber-containing foam filled in the mold 13 is dried in the mold 13 at a predetermined temperature for a predetermined time. By heating and drying in the mold 13 in this manner, the fibers in the vicinity of the surface of the obtained three-dimensional fiber molding are cured, the inner surface shape of the mold 13 is satisfactorily transferred, and the three-dimensional fiber is cured into a shell shape. A molded body is obtained. This effect is particularly remarkably obtained when the thermoplastic fiber in which the fibers near the surface are preferentially fused is used.

The drying temperature and the drying time can be appropriately set depending on the fibers dispersed in the fiber-containing foam, the size and shape of the molded product, and the like. When the thermoplastic fibers are used as the fibers and the fibers are heat-sealed, the fibers are heated to a temperature equal to or higher than the melting point of the fibers and dried.

After drying to a predetermined water content or until the thermoplastic fibers are joined by heat fusion, the mold 13 is cooled and then the three-dimensional fiber molding 1 is formed as shown in FIG. 1 (c). After releasing the mold, trimming, burr treatment of the three-dimensional fiber molded body, application of a surface hardening agent component such as PVA or acrylic emulsion, and the like are performed as required, and the production is completed.

The three-dimensional fiber molding 1 obtained as described above has a bulk density of 0.01 to 0.5 g / cm ³ and is bulky, and as shown in FIG. Is excellently transferred, and the shape in which the protrusion 3 is projected from the substrate 2 is excellent in shape retention. In particular, the portion of the protrusion 3 that has been sucked through the suction holes 14 has a higher density and excellent mechanical strength than the portion that is not sucked, and is preferably used for brushes and the like.

As described above, according to the method for manufacturing a three-dimensional fiber molded body of the present embodiment, one mold has a three-dimensional shape in which the inner surface shape of the mold 13 is satisfactorily transferred to the outer surface. The bulky three-dimensional fiber molding 1 can be suitably manufactured. Further, when the fiber-containing foam is filled in the mold 13, the suction through the suction holes 14 of the mold 13 is also used, so that the tip of the concave portion 13a corresponding to the protrusion 3 from the substrate portion 2 is formed. Form 1 containing fiber-containing foam
It is possible to fill 3 without any gap. Further, since the fiber content of the fiber-containing foam is high, the drying time is short, and the molding can be completed only by filling the mold 13 and drying, and the manufacturing process including drying and molding can be significantly shortened. be able to.

The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention.

According to the present invention, an external force is applied to the composition containing water and the surfactant to foam the composition so that the bubble content is 20 vol% or more, while the composition has a fiber content of 10 to 70 wt%. A three-dimensional fiber molding can be manufactured in the same manner as in the above-mentioned embodiment, except that the above fibers are gradually added to form a fiber-containing foam in which the content of the fibers is dispersed. In this method of forming a fiber-containing foam, it is possible to obtain a higher bubble content rate,
The fibers can be dispersed more uniformly, the fluidity of the fiber-containing foam when the mold is filled with the fiber-containing foam is good, and the moldability of the three-dimensional fiber molding can be improved.

In the present invention, as in the above-described embodiment, even when the inner surface of the mold has a complicated shape, it is desired to fill the fiber-containing foam in every corner without any gap, or the obtained three-dimensional fiber molding is partially If you want to increase the density, use a formwork that has suction holes that communicate from the inside to the outside of the formwork in the part corresponding to the complicated part or the part you want to increase the density, and use the negative pressure through the suction hole. Although it is preferable to fill the mold with the fiber-containing foam by using suction in combination, negative pressure suction may be omitted depending on the form and density of the three-dimensional fiber molding to be molded. In this case, for example, after the fiber-containing foam is filled in the mold, a desired three-dimensional fiber molded body can be obtained appropriately depending on the application, the raw material such as the fiber to be used, and the bubble content of the fiber-containing foam. It is preferable to fill the fiber-containing foam into the mold without any gap by pressurizing the filled fiber-containing foam with a sufficient pressure.

When the fiber-containing foam is filled in the mold, the fiber-containing foam is filled while spraying the inner surface of the mold so that the fiber-containing foam is filled in the mold without any gap. You can also

When the fiber-containing foam is filled in the mold, it is preferable to fill the fiber-containing foam in the mold all at once, but the filling of the fiber-containing foam is divided in stages. Different types of fibers,
It is also possible to change the bubble content rate of the fiber-containing foam, the molding conditions, etc. to fill the inside of the mold. For example, when it is desired to increase the bulk density and give strength to a predetermined part of the obtained molded body, the fiber-containing foam is filled with a high filling pressure in advance for the predetermined part, and then the rest is lower than the filling pressure. By filling the fiber-containing foam with pressure, a desired molded body can be obtained. Specifically, a tubular body is arranged so as to surround all the opening portions of the plurality of recesses 13a corresponding to the projecting portion 3 shown in FIG. 1, and first, the fiber-containing foam is placed in the tubular body. A fixed amount is filled, and the filled fiber-containing foam is filled with a high filling pressure while applying suction pressure so that the filled fiber-containing foam is pressed by the piston or the like so as to have a thickness equal to or less than the thickness of the recess 13a and the substrate portion 2, Then, the remaining portion of the mold 13 can be filled with the fiber-containing foam at the filling pressure lower than the suction pressure. By filling in this way, it is possible to make the protrusions 3 of the obtained molded body have high bulk density and hardness and high strength, and to make the substrate portion 2 soft, so that the protrusions required for a brush or the like are It may be hard and the substrate may be soft.

The applicable range of the method for producing a three-dimensional fiber molding of the present invention is wide, and in addition to the production of the brush as in the above embodiment, for example, the member 5 for the mouthpiece portion of the mask as shown in FIG. 3 (a). , Various types of three-dimensional bodies such as members for health appliances that are used by putting them on the fingers and toes as shown in FIG. 3 (b), various pads used for the body and clothes, heat insulating materials, cushioning materials, various containers, etc. It can be applied to the production of fiber moldings.

[0041]

EXAMPLES Three-dimensional fiber moldings were produced as in the following Examples 1 to 5 and Comparative Examples 1 to 7, and the obtained three-dimensional fiber moldings were evaluated for the properties and moldability of the fiber-containing foam as described below. , And the obtained three-dimensional fiber molding were subjected to sensory evaluation. The results are shown in Table 1 together with the bubble content rate and the fiber content rate in each Example and Comparative Example.

[Example 1] <Composition of composition> Water: 78 wt% Surfactant: manufactured by Kao Corporation, Emar 227, 2 wt%

<Foaming conditions> The composition was placed in a container,
The mixture was stirred at room temperature and atmospheric pressure with a stirrer (manufactured by Kenwood, UK, desktop universal cooker, model KM-600, whip used for stirrer) to obtain a composition having the following bubble content. Bubble content rate: 90 vol%

<Preparation of Fiber-Containing Foam> The following fibers were added to and dispersed in the foamed composition while stirring at room temperature and normal pressure with the agitator. Fiber A: Kuraray Co., Ltd., EPTC203 (average fiber length 5 mm, average fiber diameter 2 dr) Fiber B: Kuraray Co., Ltd., N720 (average fiber length 5 m
m, average fiber diameter 2 dr) Total fiber content: 20 wt% (fiber A: 13 wt%, fiber B: 7 wt%)

<Filling of Fiber-Containing Foam> The above-mentioned fiber-containing foam was filled in the following mold at room temperature by the following pressure-feeding pump. <Pressure pump> Model 2NLS manufactured by Hyōjin Kikai Co., Ltd.
11, 40H <Form form> Substrate size: 90 mm long diameter, 60 mm short diameter elliptical shape,
Thickness 8 mm Projection dimensions: Diameter 5 mm, length 15 mm, tip rounded. Suction hole diameter: 0.5 mm Suction pressure: 70 kPa

<Drying conditions> The mold filled with the fiber-containing foam is heated and dried at 150 ° C. (form temperature) for 2 minutes in an atmosphere of normal temperature and normal pressure, and the fibers are fused to form a three-dimensional fiber. A molded body was produced.

[Examples 2 to 5] Three-dimensional fiber moldings were produced in the same manner as in Example 1 except that the bubble content and fiber content shown in Table 1 were used.

[Comparative Examples 1 to 7] A three-dimensional fiber molding was produced in the same manner as in Example 1 except that the bubble content and fiber content shown in Table 1 were used.

[Evaluation of Fiber-Containing Foam] The obtained fiber-containing foam was evaluated by visual observation in the following three stages. ◯: The uniformity of the fiber-containing foam is maintained and the fibers are uniformly dispersed. Δ: Although the uniformity of the fiber-containing foam was maintained,
Some fibers are unevenly distributed. X: Bubbles cannot be filled between the fibers, or water and bubbles are not separated to form a fiber-containing foam.

[Evaluation of Three-Dimensional Fiber Molded Article] The obtained three-dimensional fiber molded article was evaluated in the following three grades according to the transferability of the inner surface shape of the mold, particularly the transferability of the protrusions and corners. ◯: The inner surface shape of the mold is transferred well. Δ: The transferability of the substrate portion is good, but the tip or part of the side surface of the protrusion is not transferred, or a cavity is seen inside the protrusion, but it can be used as a brush. X: The transferability of the substrate part is poor, and / or the protrusion part is not formed at all.

[0051]

[Table 1]

As shown in Table 1, in the three-dimensional fiber moldings obtained in the examples, the shape of the inner surface of the mold was satisfactorily transferred to the substrate portion and the protrusions, and the moldability was good. The three-dimensional fiber moldings obtained in the examples had particularly poor moldability of the protrusions and poor moldability of the substrate portion.

[0053]

According to the present invention, it is possible to suitably manufacture a bulky three-dimensional fiber molding in which the inner surface shape of the mold is satisfactorily transferred to the outer surface by one mold.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a procedure for manufacturing a three-dimensional fiber molded body according to an embodiment of a method for manufacturing a three-dimensional fiber molded body of the present invention, in which (a) is a mold filled with a fiber-containing foam. FIG. 3B is a cross-sectional view showing a state in which the filling is completed, FIG. 6B is a cross-sectional view showing a state in which filling is completed, and FIG.

FIG. 2 is a perspective view schematically showing a three-dimensional fiber molded body obtained by the same embodiment.

FIG. 3 is a perspective view schematically showing another embodiment of a three-dimensional fiber molded body manufactured by the method for manufacturing a three-dimensional fiber molded body of the present invention, in which (a) is a solid body applied to a mouthpiece member of a mask. FIG. 3 is a diagram showing a fiber molded body, and (b) is a diagram showing a three-dimensional fiber molded body applied to a member to be fitted on a finger.

[Explanation of symbols]

1 three-dimensional fiber molding 2 board part 3 protrusions 13 Formwork 14 Suction hole

Claims (3)

[Claims] 1. An external force is applied to a composition containing water and a surfactant to foam it so that the bubble content is 20 vol% or more, and then the foamed composition has a fiber content of 10 to 7.
Fibers are dispersed to 0 wt% to form a fiber-containing foam, and the fiber-containing foam is filled in a mold,
A method for producing a three-dimensional fiber molding, which comprises drying the fiber-containing foam in the mold. 2. A suction hole communicating from the inside to the outside is formed in the mold, and the fiber-containing foam is filled into the mold while sucking the fiber-containing foam through the suction hole. A method for producing the three-dimensional fiber molding described. 3. The method for producing a three-dimensional fiber molding according to claim 1, wherein the fibers include thermoplastic fibers, and the thermoplastic fibers are heat-sealed by the drying.