CN113749331A

CN113749331A - Gauze mask

Info

Publication number: CN113749331A
Application number: CN202110293415.2A
Authority: CN
Inventors: 越智康行
Original assignee: DrC Medical Medicine Co ltd; Ichihiro Co ltd
Current assignee: DrC Medical Medicine Co ltd; Ichihiro Co ltd
Priority date: 2020-06-01
Filing date: 2021-03-18
Publication date: 2021-12-07
Also published as: JP6851054B1; JP2021188186A

Abstract

A mask, a main body part (1) is formed by sewing an inner woven fabric (3) facing a face part, an outer woven fabric (4) forming a front and a back with the inner woven fabric (3), and a non-woven fabric (5) of an intermediate material sandwiched between the two woven fabrics into a whole.

Description

Gauze mask

Technical Field

The present invention relates to a mask, and more particularly to a technique for suppressing deterioration of collection efficiency.

Background

Conventionally, masks have been made of woven or nonwoven fabrics of natural fibers or chemical fibers as main materials, and have been formed into shapes covering the mouth and nose, and have been used for suppressing the intrusion of particles such as pollen and dust into the body and suppressing the scattering of droplets from coughing and sneezing.

The particles collected (filtered) by the mask include pollen (30.0 μm), human cells (10.0 μm), droplets (3.0 to 5.0 μm), PM2.5(2.5 μm), bacteria (1.0 μm), and influenza virus (0.1 μm).

The types of masks include dust-proof masks (respiratory protection devices), medical masks, and household masks. The dustproof mask includes N95 standard masks, DS2 standard masks, and the like, the medical masks include N95 standard masks, DS2 standard masks, surgical masks (for operation), and the like, and the household masks include masks for use in cold protection countermeasures, pollen countermeasures, cold countermeasures, virus countermeasures, PM2.5 countermeasures, and the like.

The mask of N95 size is a particle mask approved to meet the N95 size specified by the national institute for labor safety and health (NIOSH). High-performance masks capable of preventing the invasion of droplets containing viruses are used as one of measures for SARS (severe acute respiratory syndrome), MERS (middle east respiratory syndrome), new influenza, and tubercle bacillus in japan. The possibility of infection is also minimized in daily work in medical facilities and the like.

The DS2 standard is a standard established by the japan ministry of labour and labour, and the N95 standard has substantially the same performance as the DS2 standard.

A surgical mask is developed so that saliva, bacteria, and the like do not adhere to a surgical site of a patient from a mouth of a doctor during surgery or the like. For the countermeasures against viruses, earthquakes and particulate matter (PM2.5), both the N95-size mask and the DS 2-size mask are effective for reducing the risk of inhalation.

The test method of the Filtration collection (Filtration) performance of the mask includes a pollen Particle collection (Filtration) Efficiency test performed with test particles (about 30 μm) as a collection target, a Bacterial droplet collection (Filtration) Efficiency test (BFE Bacterial Filtration Efficiency) performed with a suspension (about 3 μm) of staphylococcus aureus as test particles, a viral droplet collection (Filtration) Efficiency test (VFE viral Filtration Efficiency) performed with phage (about 1.7 μm) as test particles, and a fine Particle collection (Filtration) Efficiency test (PFE particulate Filtration Efficiency) performed with polystyrene particles (0.1 μm) as test particles.

The specification N95 stipulates that 95% or more of the test particles (0.3 μm) can be collected as mask performance.

The American Standard Specification (ASTM F2100-11: Standard Specification for Performance of Materials Used in Medical mask masks.2011: Standard Specification for Performance of Medical mask Materials) of surgical masks (Medical masks) stipulates that the bacteria filtration rate (%). is not less than 95 and the fine particle filtration rate (%). is not less than 95 as class 1.

Japanese laid-open patent publication 2017-101374 discloses a hygienic mask with antiviral agent applied thereto, which is composed of two or more layers of a knitted fabric with antiviral agent applied thereto and a knitted fabric without antiviral agent applied thereto. A knitted fabric to which an antiviral agent has been applied is disposed on the front surface side, and a knitted fabric to which no antiviral agent has been applied is disposed on the inner side.

Disclosure of Invention

Problems to be solved by the invention

In recent years, the function of nonwoven fabrics has been improved, and the performance of masks has been dramatically improved. The nonwoven fabric may be produced by a dry method, a wet method, a spunbond method, a melt-blown method, or an air-laid method depending on the method of forming the web.

Here, the melt blowing method is explained. In the melt blowing method, a molten resin is extruded from a spinning nozzle to spin fibers, and the fibers are finely stretched by high-temperature air ejected from the periphery of the spinning nozzle, and the fine fibers obtained by the spinning are gathered into a sheet-like form to produce a web.

The melt blowing method is characterized in that the melt blowing method is efficient because the melt blowing method can be directly formed into a sheet from a resin, and the melt blowing method can reduce the fiber diameter (1 to 10 μm) because the melt blowing method is stretched by wind. Therefore, a meltblown nonwoven fabric composed of only fine ultrafine fibers, which cannot be produced by the dry or wet method, can be produced, and is used for various filters, such as masks, due to its dense structure.

Masks made of nonwoven fabric are disposable and cannot be cleaned and reused. In particular, the masks made of the melt-blown nonwoven fabric are washed, and the filter collection (filtration) efficiency of the melt-blown nonwoven fabric is lowered, and thus the masks do not satisfy the surgical mask standards, N95 standards, and DS2 standards.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a mask that can suppress a decrease in filter collection (filtration) efficiency of a nonwoven fabric even when the mask is washed.

Means for solving the problems

In order to solve the above problems, the mask of the present invention is characterized in that the main body has an inner woven fabric facing the face, an outer woven fabric forming the front and back faces with the inner woven fabric, and an intermediate material sandwiched between the two woven fabrics, and the inner woven fabric and the outer woven fabric of a multi-layer yarn fabric each including cotton yarn and protecting the melt-blown nonwoven fabric during washing are sewn and sewn integrally along the periphery of the main body.

The mask of the present invention is characterized in that the outer cloth is coated with a processing agent containing a mixture of titanium oxide, hydroxyapatite and silver.

Drawings

Fig. 1 is an exploded perspective view of a mask according to an embodiment of the present invention.

Fig. 2 is a sectional view of the mask in this embodiment.

Fig. 3 is a schematic view showing a wearing state of the mask according to this embodiment.

Description of the reference numerals

1: main body part

2: ear hanging part

3: inside weaving

4: outside weaving

5: non-woven fabric

6: superficial tissue

7: back weave structure

10: gauze mask

11: face part

12: joint seam

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In fig. 1 and 2, a mask 10 according to the present embodiment includes a main body 1 and ear loops 2 provided on both sides of the main body 1.

The main body 1 includes an inner woven fabric 3 facing the face 11, an outer woven fabric 4 forming a front and a back with respect to the inner woven fabric, and an intermediate nonwoven fabric 5 sandwiched between the inner woven fabric 3 and the outer woven fabric 4, and the inner woven fabric 3, the outer woven fabric 4, and the intermediate nonwoven fabric 5 are integrally sewn to each other in accordance with a normal sewing specification of the mask 10. The sewing specifications are various, and in the present embodiment, the inner fabric 3, the outer fabric 4, and the nonwoven fabric 5 of the intermediate material are sewn together at the seams 12 along the periphery of the main body 1, and an auxiliary sewing portion may be provided.

The inner fabric 3 and the outer fabric 4 are each a multi-layer yarn fabric, and here are two-layer yarn fabrics, but may be one layer, three layers, or multiple layers. Further, various woven fabrics can be used without being limited to the yarn woven fabric.

An example of the two-layer yarn fabric is described below. The two-layer yarn fabric is, for example, a multi-arm woven fabric, and the

woven fabrics

3 and 4 have a surface weave 6 forming the front surface side and a back weave 7 forming the back surface side. The front woven fabric 3 includes 30 single-yarn cotton yarns for both warp and weft, and the back woven fabric 4 includes 40 double-yarn cotton yarns for both warp and weft and 20 single-yarn cotton yarns for weft. In general, a scrim is an extremely coarse plain woven fabric having a warp density of 30 threads/inch and a weft density of about 22 threads/inch, and is a soft finished fabric. The two-layer yarn fabric of the present embodiment is also woven at the same density.

The outer woven fabric 4 is coated with a processing agent containing a mixture of titanium oxide, hydroxyapatite, and silver. The processing agent is obtained by evolving a photocatalyst, is a mixed catalyst which acts even without light, and has a function of decomposing and converting proteins such as pollen, house dust, mold, sweat, odor, and unsanitary proteins into water.

"titanium oxide" (TiO)₂) Typical photocatalytic substances are proteins that decompose pollen, house dust, mold, sweat, odor, and the like, and are not sanitary proteins. Titanium oxide is highly safe and is used as a main component of foundation for women, and also used as a food additive for white chocolate and the like.

"hydroxyapatite" (HAp: Ca)₁₀(PO₄)₆(OH)₂) As one of calcium, proteins such as pollen, house dust, mold, sweat, smell, etc., and unsanitary proteins are adsorbed in the fiber.

An electrode of "silver" (Ag) — titanium oxide, promoting the decomposition activity. Since the trace amount of silver is an energy source instead of light, the silver is decomposed even in the absence of light. The protein is decomposed by the above 3 actions.

The nonwoven 5 of the intermediate material here comprises a meltblown nonwoven. The method for producing the meltblown nonwoven fabric is as described above, and the description thereof is omitted here. In the present invention, the nonwoven fabric 5 is not limited to the meltblown nonwoven fabric, and the above-described various nonwoven fabrics can be used depending on the target filter trapping (filtering) efficiency.

As described above, in the mask 10 of the present embodiment, the main body 1 is formed by integrally sewing the inner woven fabric 3, the outer woven fabric 4, and the nonwoven fabric 5 of the intermediate material, and thus, the reduction in filter collection (filtration) efficiency of the nonwoven fabric 5 can be suppressed by cleaning, so-called washing, of the mask 10.

The following shows the filter characteristic test results of the mask 10 using the meltblown nonwoven fabric of the present embodiment. The test was for a surgical mask size.

The measuring apparatus was an automatic filter efficiency measuring apparatus AFT8130A manufactured by TSI corporation, usa, and measured on the same day with N being 5 (number of samples). The national institute of labor safety and health (NIOSH) used A Filter Tester (AFT) manufactured by TSI corporation for certification.

TABLE 1

PFE test results

According to the above test results, all of the samples 1 to 5 of the mask 10 of the present embodiment satisfied a collection efficiency of 97% or more in the fine particle collection (filtration) efficiency test (PFE) using polystyrene particles (0.1 μm) as test particles. The results met class 1 of the surgical mask specification.

This means that by integrally sewing the inner woven fabric 3, the outer woven fabric 4, and the nonwoven fabric 5 of the intermediate material together to form the main body 1, a decrease in the filter collection efficiency of the nonwoven fabric 5 can be suppressed.

That is, the inner woven fabric 3 and the outer woven fabric 4 function to protect the nonwoven fabric 5 during washing. In the present embodiment, a two-layer yarn woven fabric is used as the woven fabric, but as described above, the gauze is usually an extremely thick plain woven fabric having a warp density of 30 threads/inch and a weft density of about 22 threads/inch, and is a soft woven fabric. Therefore, it is apparent that the same effect is obtained even when a woven fabric having a higher density is used.

In the present embodiment, a meltblown nonwoven fabric is used, but it is apparent that a decrease in filter collection efficiency can be suppressed also in nonwoven fabrics formed by other web forming methods, that is, a dry method, a wet method, a spunbond method, and an air-laid method. That is, this is because the meltblown nonwoven fabric is composed of very fine fibers (1 to 10 μm) which are the finest as compared with other nonwoven fabrics.

Claims

1. A mask is characterized in that a main body part comprises an inner woven fabric facing a face part, an outer woven fabric forming a front and a back with the inner woven fabric, and an intermediate material sandwiched between the two woven fabrics,

the melt-blown nonwoven fabric forming the intermediate material, and the inner woven fabric and the outer woven fabric of the multi-layer yarn fabric which protects the melt-blown nonwoven fabric during washing and respectively contains cotton yarns are sewn and sewn together along the periphery of the main body.

2. The mask of claim 1 wherein the outer cloth is coated with a processing agent comprising a mixture of titanium oxide, hydroxyapatite and silver.