JP2018040066A - Nonwoven fabric retaining functional powder and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonwoven fabric capable of obtaining an effect equivalent to a content of functional powder without coating the surface of the functional powder, and yet not exfoliating the functional powder by applying the functional powder to a nonwoven fabric without using a binder.SOLUTION: The nonwoven fabric retaining functional powder is obtained by disposing a compressed air injection device and a powder shake down device in the vicinity of a spinneret of a melt spinning machine, jetting a molten thermoplastic resin in a horizontal direction as a fiber flow from the spinneret while injecting compressed air toward the fiber flow from the compressed air injection device to have the fiber flow a spirally entangled fiber, and shaking down functional powder onto the fiber from the powder shake down device to entangle.SELECTED DRAWING: Figure 1

Description

The present invention relates to a nonwoven fabric holding functional powder and a method for producing the same.

When a function other than the function of the fibers constituting the structure is imparted to a fiber structure such as a nonwoven fabric or a woven fabric, a method of imparting functional powder to the fiber structure is generally used. As a method of imparting functional powder to the fiber structure, spinning is performed using a fiber material in which the functional powder is kneaded in advance to produce a nonwoven fabric / woven fabric, and the functional powder is used as a binder. A method of mixing with a solution and applying to a nonwoven fabric or woven fabric by impregnation or spraying and drying is used. For example, in Patent Document 1, functional particles are supported on at least the surface of a nonwoven fabric in which at least a part of the raw material fibers are thermoplastic polymer fibers by a dry method, and then the thermoplastic polymer fibers in the nonwoven fabric are subjected to heat treatment. A method is disclosed in which at least the surface is softened and the functional particles are fixed to the fiber surface.

However, in the method of producing a nonwoven fabric or woven fabric by spinning using a fiber material kneaded with a functional powder in advance, the functional powder is kneaded into the fiber material. Most of the surface was coated with a fiber material, and an effect equivalent to the content (total surface area) of the functional powder could not be obtained. The functional powder is required to have a property capable of withstanding the fiber spinning conditions such as heat resistance and acid / alkali resistance, so that the functional powder that can be actually kneaded into the fiber is limited. There was a problem.

On the other hand, in a method in which functional powder is mixed with a binder solution and impregnated or sprayed onto a nonwoven fabric or woven fabric and dried, the binder, which is an adhesive, adheres mainly to the contact points between the fibers and the functional powder. Then, since the surface of the functional powder is partially coated, there is a problem that the effect equivalent to the content of the functional powder cannot be obtained as in the method of kneading the functional powder. there were. Therefore, a method capable of obtaining an effect equivalent to the content of the functional powder has been desired.

JP-A-7-268767

The present invention can provide an effect equivalent to the content of the functional powder without coating the surface of the functional powder by applying the functional powder to the nonwoven fabric without using a binder, Moreover, an object is to provide a nonwoven fabric in which functional powder does not fall off.

As a result of intensive studies, the inventors have arranged a compressed air injection device and a powder shake-off device in the vicinity of the spinneret of the melt-spinning device, and the molten thermoplastic resin from the spinneret as a fiber stream is horizontally disposed. In addition to jetting in the direction, compressed air is jetted from the compressed air jetting device toward the fiber flow, and the fiber flow is made into a spirally entangled fiber, and the functional powder is shaken off to the fiber from the powder shaker In the nonwoven fabric holding the functional powder obtained by entanglement, the surface of the functional powder is not coated, and an effect equivalent to the content of the functional powder can be obtained. The present invention was completed by finding that no body dropout occurred.

That is, the nonwoven fabric holding the functional powder of the first invention is
In the vicinity of the spinneret of the melt spinning device, a compressed air jet device and a powder shaker device are arranged,
From the spinneret, the molten thermoplastic resin is injected in the horizontal direction as a fiber stream,
Compressed air is sprayed from the compressed air injection device toward the fiber flow, and the fiber flow is entangled into fibers,
It is characterized in that it was obtained from a powder shake-off device by swinging the functional powder around the fiber and intertwining it.

In the nonwoven fabric holding the functional powder of the first aspect of the present invention, the amount of the functional powder held is preferably 50 parts by weight or more with respect to 100 parts by weight of the fiber.

In the nonwoven fabric holding the functional powder of the first aspect of the present invention, the fibers preferably have an average fiber diameter of 10 μm or less and an average fiber length of 150 mm or more.

In the nonwoven fabric holding the functional powder of the first invention, the functional powder is preferably a powder, granule or porous granule having a specific gravity of 7.0 or less and an average particle size of 60 μm or less. .

The method for producing a nonwoven fabric holding the functional powder of the present invention is as follows.
In the vicinity of the spinneret of the melt spinning device, a compressed air jet device and a powder shaker device are arranged,
A step of injecting a molten thermoplastic resin in the horizontal direction as a fiber stream from a spinneret;
A process of jetting compressed air from the compressed air jetting device toward the fiber stream to form a fiber stream entangled with the fiber stream; and
From the powder shaker, the process includes a step of tangling the functional powder onto the fiber.

The nonwoven fabric holding the functional powder of the second invention is
A non-woven fabric made of thermoplastic resin fibers,
The functional powder is held, and 50% or more of the surface area of the functional powder is exposed.

The non-woven fabric holding the functional powder of the first aspect of the present invention has no functional surface covering the surface of the functional powder because the functional powder is held without using a binder in the gap between the fibers. Compared with the nonwoven fabric manufactured by the method of kneading the functional powder or the method of using a binder, the functional powder has a larger surface area. Thereby, the effect equivalent to content can be acquired, without reducing the performance of functional powder.
According to the method for producing a nonwoven fabric holding the functional powder of the present invention, the nonwoven fabric holding the functional powder of the first present invention can be suitably produced.
The nonwoven fabric holding the functional powder of the second aspect of the present invention is produced by a conventional method of kneading the functional powder or a method using a binder because 50% or more of the surface area of the functional powder is exposed. Compared with the non-woven fabric, the functional powder has a larger surface area. Thereby, the effect equivalent to content can be acquired, without reducing the performance of functional powder.

It is a schematic diagram which shows an example of the melt spinning apparatus used for manufacture of the nonwoven fabric holding the functional powder of 1st this invention, a compressed air injection apparatus, and a powder shake-off apparatus. 2 is an optical micrograph of the surface state of a nonwoven fabric holding the functional powder obtained in Example 1. FIG. 4 is an optical micrograph of the surface state of a nonwoven fabric holding the functional powder obtained in Comparative Example 1. 4 is an optical micrograph of the surface state of a nonwoven fabric holding the functional powder obtained in Comparative Example 3.

<Nonwoven fabric holding functional powder of first invention>
Hereinafter, the nonwoven fabric holding the functional powder of the first invention will be described in detail.
The nonwoven fabric holding the functional powder of the first aspect of the present invention is a thermoplastic resin melted from the spinneret by arranging a compressed air jet device and a powder shaker near the spinneret of the melt spinning device. Is sprayed in the horizontal direction as a fiber stream, and compressed air is sprayed from the compressed air spray device toward the fiber stream to form a fiber stream that is entangled with the fiber stream. It is characterized by being obtained by shaking the body and entangled it.

The non-woven fabric holding the functional powder of the first invention is a non-woven fabric composed of fibers entangled in a spiral shape, and the functional powder is held without using a binder between the fibers. It is characterized by no dropout. The thermoplastic resin injected from the spinneret of the melt spinning apparatus becomes a flow of several tens to several hundreds of fibers by the compressed air from the compressed air injection device disposed in the vicinity of the spinneret. It is characterized by being intertwined in a spiral.

In the nonwoven fabric holding the functional powder of the first aspect of the present invention, the functional powder is shaken off to the fibers in which the fiber flow is spirally entangled from the powder shaker arranged in the vicinity of the spinneret, Even if it does not use a binder, it is physically held in the gap between the fibers and does not fall off from the gap between the fibers. In some cases, the holding force of the functional powder may be enhanced by applying an electrostatic force depending on the type of the thermoplastic resin.

FIG. 1 is a schematic view showing an example of a melt spinning apparatus, a compressed air injection apparatus, and a powder shake-off apparatus used for manufacturing a nonwoven fabric holding the functional powder of the first aspect of the present invention. In FIG. 1, thermoplastic resin fibers (hereinafter also referred to as long fibers) are produced by a melt-blowing method. A thermoplastic resin 2 serving as a fiber is melted by a heater (not shown) installed in the melt spinning apparatus 1 and sprayed from the spinneret 5 in a horizontal direction by a rotating screw (not shown) of the melt extruder 4. The injected thermoplastic resin 2 is then divided by striking by applying high-speed compressed air 8 injected from the compressed air injection port 7 of the compressed air injection device 6, and then rides on the air stream. It will be stretched at tens and hundreds of long filaments. At that time, the long fibers pushed out by the air flow of the compressed air 8 receive air resistance and move in a Karman vortex. Therefore, the long fibers do not move in parallel but move while being intertwined in a spiral shape. In the present invention, long fibers are defined as those having an apparent average fiber length of 150 mm or more.

The number of the spinneret 5 is not limited to one and may be plural. From the viewpoint of productivity, the number of spinnerets is preferably plural. On the other hand, from the viewpoint that a finer fiber can be produced by increasing the extrusion pressure, the number of spinnerets is preferably one.

The compressed air injection device 6 is used to apply high-speed compressed air 8 to the injected thermoplastic resin 2. The position of the compressed air injection port 7 is not particularly limited as long as it is around the spinneret 5. However, since the thermoplastic resin 2 injected from the spinneret 5 falls downward due to gravity, a portion below the height of the spinneret 5 is used. It is desirable to be installed in When there are a plurality of spinnerets 5, a plurality of compressed air injection ports 7 may be provided.

The air pressure of the compressed air 8 is not particularly limited, but is usually 0.1 Mpa or more. Increasing the air pressure of the compressed air increases the speed of the compressed air. In addition, since it is difficult to make the fiber diameter small when using a high-viscosity thermoplastic resin and an air pressure of 0.1 Mpa, it is generally preferable to set it to 0.2 Mpa or more.

The temperature of the compressed air 8 is not particularly limited, but is preferably from the melting point to the decomposition point of the thermoplastic resin, more preferably up to a decomposition point of −30 ° C. If the temperature of the compressed air is less than the melting point of the thermoplastic resin, thermoplastic resin lumps (shots) are likely to occur or the average fiber diameter may exceed 10 μm and become thick, and the decomposition point of the thermoplastic resin If the temperature is exceeded, a part of the thermoplastic resin may be decomposed to deteriorate the yield, and shots may easily occur.

The thermoplastic resin 2 is not particularly limited. For example, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polymers such as isophthalic acid and phthalic acid, polyolefin resins such as polyamide resin, and polypropylene. Examples thereof include resins and copolymers thereof. These may be used alone or in combination of two or more. Among these thermoplastic resins, polypropylene and the like are preferable from the viewpoint that the holding power of the functional powder can be enhanced by electrostatic force.

The viscosity of the thermoplastic resin 2 is not particularly limited, but the MFR is preferably 10 or more, and more preferably 1000 or more. Here, MFR (melt flow rate) refers to the amount of resin (unit: g) that is extruded at 230 ° C. and 2.16 kg and extruded in 10 minutes by an extrusion plastometer. When the MFR is less than 10, the viscosity is high, so that it is difficult to become a fiber, and even when it becomes a fiber, the average fiber diameter tends to be thicker than 10 μm.

The thermoplastic resin 2 may contain a conventionally used additive for the purpose of improving the spinning property and reinforcing the function of the fiber. The additive is not particularly limited, and examples thereof include stabilizers such as antioxidants, ultraviolet absorbers, heat stabilizers, antistatic agents, flame retardants, fillers, fragrances, fluorescent whitening agents, wetting agents, plasticizers. Agents, thickeners, dispersants, foaming agents and the like. These additives may be used independently and may use 2 or more types together.

Although the average fiber diameter of a fiber is not specifically limited, It is preferable that it is 10 micrometers or less, and it is more preferable that it is 3 micrometers or less. This is because, in general, when the fibers have the same weight, the smaller the average fiber diameter, the larger the amount of functional powder that can be retained. When the average fiber diameter exceeds 10 μm, the number of fibers ejected from the spinneret 5 is decreased, and it may be difficult to hold the functional powder. In addition, in this invention, an average fiber diameter means the average value of the result of having taken the photograph of 3000 times magnification using the scanning electron microscope (SEM), and measuring the fiber diameter of 50 fibers.
The average fiber diameter can be adjusted by adjusting the balance of the viscosity of the thermoplastic resin, the air pressure of the compressed air, the temperature, and the like. Generally, the average fiber diameter tends to be smaller (thinner) as the viscosity of the thermoplastic resin is lower and as the air pressure and temperature of the compressed air 8 are higher.

Although the average fiber length of a fiber is not specifically limited, It is preferable that it is 150 mm or more, and it is more preferable that it is 200 mm or more. If the average fiber length is less than 150 mm, the fiber collection tends to vary, and the fiber itself may be difficult to hold the functional powder.

The fibers constituting the nonwoven fabric holding the functional powder of the first invention may be fibers obtained by mixing two or more thermoplastic resins, or may be obtained from the same thermoplastic resin. It may be a mixture of two or more types of fibers having different average fiber diameters, or a mixture of two or more types of fibers having different types of thermoplastic resins and different average fiber diameters. Good. At that time, a plurality of melt blowing apparatuses may be used, and an electrospinning method may be used in combination with the melt blowing method. When bulkiness is required, it is possible to mix short fibers of less than 50%.

The functional powder 9 is not particularly limited. For example, activated carbon, calcium phosphate compound, titanium dioxide, zeolite, silica gel, molecular sieve, inorganic deodorant, inorganic antibacterial agent or a mixture thereof, And pigments. These may be used alone or in combination of two or more.

The specific gravity of the functional powder is not particularly limited, but is preferably 7.0 or less, and more preferably 3.0 or less. When the specific gravity of the functional powder exceeds 7.0, the retained amount of the functional powder decreases, and the effects of the functional powder may not be sufficiently obtained.

The average particle size of the functional powder is not particularly limited, but is preferably 100 μm or less, and more preferably 60 μm or less. When the average particle diameter exceeds 100 μm, the amount of the functional powder retained decreases, and the effects of the functional powder may not be sufficiently obtained.

The functional powder is preferably powder, granule or porous granule from the viewpoint of shaking off. Here, a powder is a powder obtained by cutting a solid material, a powder produced by chemical synthesis such as a monomer polymerization reaction, a granule is a powder obtained by collecting and molding a powder, and a porous granule is a granule Each of the powders produced by intentionally forming bubbles during molding is shown.

The functional powder 9 is shaken off by vibration from the nozzle at the tip of the powder shaker 10. The amount of shake off can be controlled by changing the frequency and nozzle diameter. The installation place of the powder shake-off device 10 may be a place where the shaken-down functional powder rides on the flow of the compressed air 8, and generally the downstream side is preferable to the compressed air injection port 7.

The retention amount of the functional powder 9 is not particularly limited, but is preferably 50 parts by weight or more, and more preferably 100 parts by weight or more with respect to 100 parts by weight of the fiber. When the amount of the functional powder retained is less than 50 parts by weight, the function of the functional powder may not be sufficiently exhibited.

The non-woven cloth holding the functional powder of the present invention is provided with a powder shaker 10 for dropping a predetermined amount of functional powder near the upper portion of the spinneret 5, and when the fibers are entangled in a spiral shape, the functional powder After a predetermined amount of the body is shaken off to the fiber, it is obtained by collecting it by rotating it by a necessary weight using a winding roll 11 or the like. Thereafter, excess functional powder adhering to the surface is removed with a vibration device (not shown). By performing these operations, the functional powder is physically held without using a binder between the fibers, so that the functional powder does not fall off.

<The manufacturing method of the nonwoven fabric holding the functional powder of this invention>
The method for producing a nonwoven fabric holding the functional powder of the present invention is as follows.
In the vicinity of the spinneret of the melt spinning device, a compressed air jet device and a powder shaker device are arranged,
A step of injecting a molten thermoplastic resin in the horizontal direction as a fiber stream from a spinneret;
A process of jetting compressed air from the compressed air jetting device toward the fiber stream to form a fiber stream entangled with the fiber stream; and
From the powder shaker, the process includes a step of tangling the functional powder onto the fiber.
The melt spinning device, compressed air jetting device, powder shaker device, thermoplastic resin, fiber, functional powder, etc. used in the method for producing the nonwoven fabric holding the functional powder of the present invention is the first book. This is the same as the nonwoven fabric holding the functional powder of the invention.

<Nonwoven fabric holding functional powder of second invention>
The nonwoven fabric holding the functional powder of the second invention is
A non-woven fabric made of thermoplastic resin fibers,
The functional powder is held, and 50% or more of the surface area of the functional powder is exposed.
The nonwoven fabric holding the functional powder of the second present invention can be produced, for example, by the method for producing a nonwoven fabric holding the functional powder of the present invention.

In the nonwoven fabric holding the functional powder of the second aspect of the present invention, the exposed area of the surface area of the functional powder is not particularly limited as long as it is 50% or more, but is preferably 70% or more. . If the exposed area is less than 50%, the surface of the functional powder is coated in the same way as the nonwoven fabric produced by the conventional method of kneading the functional powder or using the binder. The effect corresponding to the content of the functional powder may not be obtained.

Specific examples of the present invention will be described below, but the present invention is not limited to these examples.

Example 1
Polypropylene resin (manufactured by Polymiley, HP461X, MFR1100) is used as the thermoplastic resin, and activated carbon (manufactured by Osaka Gas Chemical Co., activated carbon FP-3, average particle diameter 58.7 μm, specific gravity 2) is used as the functional powder. 0.0-2.2 g / ml). A melt spinning device was used for fiberizing the polypropylene resin, and a powder shaker for dropping a predetermined amount of functional powder was disposed near the spinneret of the melt spinning device. Polypropylene resin was injected from the spinning metal of the melt spinning apparatus, and the compressed fiber air pressure was 0.3 Mpa, and the temperature was 260 ° C., thereby producing polypropylene fibers having an average fiber diameter of 1.2 μm and an average fiber length of 200 mm. The weight of the activated carbon shaken off from the powder shaker was set to about 1.4 times that of the polypropylene resin sprayed from the spinneret, and a nonwoven fabric holding the activated carbon was produced by shaking.
Then, the extra activated carbon adhering to the surface by giving a light vibration was shaken off, and finally the nonwoven fabric which hold | maintained the activated carbon 1.3 times the weight ratio with respect to a polypropylene fiber was obtained. The exposed area of the activated carbon surface area was 80%.

(Example 2)
Except having changed the amount which shakes off activated carbon, it carried out similarly to Example 1, and finally obtained the nonwoven fabric which hold | maintained the amount of activated carbon 0.6 times by weight with respect to polypropylene fiber.

(Example 3)
Except having changed the amount which shakes off activated carbon, it carried out similarly to Example 1, and finally obtained the nonwoven fabric which hold | maintained the amount of activated carbon 0.2 times by weight with respect to polypropylene fiber.

(Reference Example 1)
Except that the activated carbon was not shaken off, a nonwoven fabric consisting only of polypropylene fibers not holding activated carbon was obtained in the same manner as in Example 1.

(Comparative Example 1)
Except that the activated carbon was not shaken off, a nonwoven fabric consisting only of polypropylene fibers not holding activated carbon was obtained in the same manner as in Example 1. The activated carbon used in Example 1 is dispersed in an acrylic solution as a binder (DICN, DICNAL E8300K, solid content: 45%), impregnated with a non-woven fabric consisting only of polypropylene fibers, and dried at 100 ° C. for 30 minutes. Thus, a nonwoven fabric in which activated carbon was held with a binder was produced. By adjusting the amount of impregnation, a nonwoven fabric holding activated carbon in an amount 1.3 times by weight with respect to the amount of polypropylene fiber was obtained. In addition, the acrylic resin solid content weight of the binder used in that case was 1.5 times the weight ratio of the polypropylene fiber. Of the surface area of the activated carbon, the exposed area was 45%.

(Comparative Example 2)
In the same manner as in Comparative Example 1, a nonwoven fabric holding activated carbon in an amount 1.3 times by weight with respect to the amount of polypropylene fiber was obtained. The acrylic resin solid content weight of the binder used at that time was 1.0 times the weight ratio of the polypropylene fiber.

(Comparative Example 3)
The polypropylene resin and activated carbon used in Example 1 were put into a melt spinning apparatus, and the polypropylene resin and activated carbon were simultaneously sprayed from the spinneret to produce polypropylene fibers kneaded with activated carbon in advance. The amount of activated carbon was adjusted to 1.3 times the weight ratio of polypropylene fiber, but the flow rate of polypropylene resin was poor due to the large amount of activated carbon, and it was not possible to spray stably. I couldn't. As a result of adjusting various conditions, a nonwoven fabric in which activated carbon was kneaded in advance and retained 0.2 times the amount of activated carbon, which was the amount of activated carbon that could be produced, was obtained. The exposed area of the activated carbon surface area was 20%.

(Comparative Example 4)
For the performance evaluation of the activated carbon itself, the activated carbon used in Example 1 was prepared.

Example 4
A polypropylene resin having an average fiber diameter of 17.7 μm in the same manner as in Example 1 except that a polypropylene resin (PLBOOA, manufactured by Sun Allomer Co., Ltd.) is used as the thermoplastic resin, the compressed air pressure is 0.2 Mpa, and the temperature is 240 ° C. Fibers were made. Further, the amount of the activated carbon to be shaken off was adjusted so that the amount of activated carbon was 1.3 times as much as that of Comparative Example 1 in terms of weight ratio with respect to the amount of fibers. The ratio was 0.8 times.

(Comparative Example 5)
A polypropylene fiber web was prepared by spinning polypropylene fibers with a card machine using commercially available polypropylene short fibers (Daiwabo Polytech Co., Ltd., PN2.2 dtex × 76 mm, average fiber diameter 17.7 μm, average fiber length 76 mm). The activated carbon used in Example 1 was shaken off to the web, and the nonwoven fabric was produced without using a binder by entwining the fiber by the needle punch method. The amount of activated carbon was adjusted to be 1.3 times the weight of fiber, which is equivalent to that of Comparative Example 1, but it could not be structurally maintained and only 0.5 times the amount. Could not hold.

(Test 1) Confirmation of effect of functional powder Activated carbon has a feature of absorbing odor. Then, the effect was confirmed by measuring and comparing ammonia adsorption amount using ammonia considered as one of the three major odors. Specifically, a test piece (100 mm square) is put in an odor bag (250 mm square), 3 L of adjusted odor component gas (ammonia concentration 100 ppm) is added, and the ammonia component concentration after 2 hours and 24 hours is detected by a detector tube. It was measured. Table 1 shows the results of calculating the ammonia adsorption amount from the initial concentration by subtracting the measurement value of the odor bag without the test piece after the same time from each measurement value.

From the results of Reference Example 1, it can be seen that, even when the activated carbon is not retained, a part of ammonia is adsorbed to the polypropylene fiber after 24 hours, but this is not a value that greatly affects this experiment.
When comparing the results of Example 1 and the results of Comparative Example 1, the nonwoven fabric of Example 1 has a larger amount of ammonia adsorption than the nonwoven fabric of Comparative Example 1 using a binder, and the effect of the functional powder is achieved by using the binder. It turns out that it halves.
Since the ammonia adsorption amount of Example 1 is a numerical value substantially equivalent to the ammonia adsorption amount of Comparative Example 4, it can be seen that the nonwoven fabric holding the functional powder of the present invention has an effect equivalent to the content of activated carbon. .
Comparing the results of Example 3 with the results of Comparative Example 3, it can be seen that the nonwoven fabric of Example 3 has a larger amount of ammonia adsorbed than the non-woven fabric of Comparative Example 3 in which the functional powder was previously kneaded.
From the above, the nonwoven fabric holding the functional powder of the present invention has an effect equivalent to the content of the functional powder without degrading the performance of the functional powder. It can be seen that is fully exerted.

(Test 2) Functional powder dropout test A 20 cm square sample was held in both hands, and the operation of shaking about 20 cm up and down in 1 second was repeated, and the weights after 10, 20 and 30 times were measured. Table 2 shows the result of calculating the ratio of the activated carbon that was shaken off from the decrease from the initial weight.

From the results of Example 1, it can be seen that in the non-woven fabric holding the functional powder of the present invention, the activated carbon, which is the functional powder, does not fall off. Similarly, it can be seen that even when the nonwoven fabric using the binder of Comparative Example 1 and the nonwoven fabric kneaded with the activated carbon of Comparative Example 3, the activated carbon does not fall off. Moreover, since the fall of activated carbon has occurred in the comparative example 2, it turns out that the binder amount of the comparative example 1 is an appropriate amount.
From the results of Example 4, it can be seen that the nonwoven fabric composed of fibers having an average fiber diameter exceeding 10 μm and 17.7 μm has a small amount of activated carbon.
From Comparative Example 5, it can be seen that the needle punched nonwoven fabric composed of short fibers having an average fiber diameter of more than 10 μm and an average fiber length of less than 150 mm not only has a small amount of retained activated carbon but also falls off.
From the above results, the nonwoven fabric holding the functional powder of the present invention can hold the functional powder in the same amount or more by weight ratio with respect to the fiber amount without using a binder. Since the effect equivalent to the content of the body is shown, it is understood that the nonwoven fabric exhibits the function of the functional powder to the maximum and does not cause the functional powder to fall off.

DESCRIPTION OF SYMBOLS 1 Melt spinning apparatus 2 Thermoplastic resin 3 Hopper 4 Melt extrusion machine 5 Spinneret 6 Compressed air injection apparatus 7 Compressed air injection port 8 Compressed air 9 Functional powder 10 Powder shake-off apparatus 11 Winding roll 12 It wound up Non-woven fabric holding functional powder

Claims (6)

In the vicinity of the spinneret of the melt spinning device, a compressed air jet device and a powder shaker device are arranged,
From the spinneret, the molten thermoplastic resin is injected in the horizontal direction as a fiber stream,
Compressed air is sprayed from the compressed air injection device toward the fiber flow, and the fiber flow is entangled into fibers,
A non-woven fabric holding a functional powder obtained by pulverizing a functional powder onto a fiber and entangled it from a powder shaker. The nonwoven fabric holding the functional powder according to claim 1, wherein a holding amount of the functional powder is 50 parts by weight or more with respect to 100 parts by weight of the fiber. The nonwoven fabric holding the functional powder according to claim 1 or 2, wherein the fibers have an average fiber diameter of 10 µm or less and an average fiber length of 150 mm or more. The non-woven fabric holding the functional powder according to any one of claims 1 to 3, wherein the functional powder is a powder, granule or porous granule having a specific gravity of 7.0 or less and an average particle diameter of 60 µm or less. . In the vicinity of the spinneret of the melt spinning device, a compressed air jet device and a powder shaker device are arranged,
A step of injecting a molten thermoplastic resin in the horizontal direction as a fiber stream from a spinneret;
A process of jetting compressed air from the compressed air jetting device toward the fiber stream to form a fiber stream entangled with the fiber stream; and
The manufacturing method of the nonwoven fabric holding the functional powder characterized by including the process of sprinkling a functional powder on a fiber from a powder shake-off apparatus, and entwining it. A non-woven fabric made of thermoplastic resin fibers,
A nonwoven fabric holding functional powder, wherein the functional powder is held and 50% or more of the surface area of the functional powder is exposed.