JPS58203770A - Mask - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-performance mask, and more particularly, to a high-performance mask that is easy to wear and requires little wear.

Traditionally, fields such as hospital operating rooms and waiting rooms, pharmaceutical and biological laboratories, and pharmaceutical factories require prevention of atmospheric contamination by pathogenic bacteria and germs contained in human breath. In fields where it is necessary to prevent particles from entering fine particles, a mass made of a material such as glass microcool and covered with an organic fiber nonwoven fabric is used.

However, since such masks are composed of rigid glass fibers with very little flexibility, they tend to break while being worn, causing the disintegrated microwool to scatter and even enter the human body through breathing. There are concerns that there is a great risk of harm to health. In addition, such masks are pleated and molded to improve the ease of attachment to the noodles, but for the same reason, processing,
It is difficult to make the mask, and there are many processing problems.Furthermore, the drape of the entire mask is poor, resulting in poor wearability and poor wearing comfort.

Moreover, these glass micro-
It requires a large amount of energy to turn into lath microwool, and since the diameter of the wool varies from very thick to very thin, it requires separation, but it takes extremely high level of precision to separate it into satisfactory species. technology, and
Because the surface of the micro wool is smooth, it is easy to make it into a sheet by itself, but it requires roughening the surface of the glass micro wool, adjusting the pH of the paper making solution, adding a binder, etc., and the manufacturing cost is extremely high. Become.

The present inventors have solved the drawbacks of such conventional masks, and have developed an easy-to-wear mask that is suitable for paper making, has excellent ability to collect fine dust and bacteria, is highly reliable, and has very little effect on the human body. The present invention was arrived at as a result of extensive research into high-performance masks.

That is, the present invention mixes 5 to 40% by weight of organic fiber fibrils having an average fiber diameter of 0.1 to 3.0 μm and 95 to 60% by weight of organic fibers having an average fiber diameter of 3 to 25 μm, and wet-processes the mixture. This mask is made of a wet-processed nonwoven fabric.

The average fiber diameter of the organic fibrous fibrils used in the present invention is required to be 0.1 to 3.0 μm, and particularly preferably 0.3 to 2.0 μm. If the average fiber diameter is too thick, the wet paper will peel off from the wire mesh during paper making, making it difficult to separate the wet paper from the wire mesh and reducing the effectiveness of collecting fine dust. In addition, if the average fiber diameter is too small, there will be a problem that the fibers will dig into the wire mesh during paper making, and peeling from the wire mesh will be extremely difficult.Furthermore, productivity will decrease due to a decrease in water level, and ventilation resistance as a mask will be significant. This causes the problem that it becomes difficult to breathe when worn.

- It is necessary that the average fiber diameter of the organic fibers is 3 to 25 μm, and more preferably 4.5 to 20 μm from the viewpoint of efficiency in collecting fine dust and ease of wet papermaking. Further, the average fiber diameter of the organic fiber is 1 to tsm,
Preferable in terms of dispersibility in water, strength of the obtained nonwoven fabric, and cost required for cutting into short-length fibers, and 2 to 10111
1 is preferable for gloss. The cross-sectional shape of the organic fiber is arbitrary, but the ratio of the major axis to the minor axis (major axis/minor axis) of the cross section is 1.
It is more preferable to use fibers with a cross section of 2 to 2, that is, fibers with a round cross section or a flat cross section, in order to improve the filtration performance of fine dust.

The wet-laid nonwoven fabric used for the mask of the present invention has a mixing rate of 5 to 40% by weight, preferably 15 to 35% by weight of fibrous live 11, and a mixing rate of 95 to 95% by weight of fibrous live 11.
If the mixing ratio of organic fiber diameter fibrils, which should be 60% by weight, preferably 85 to 65% by weight, is too low, the performance of collecting fine dust etc. in the air will be significantly deteriorated.
On the other hand, if the mixing ratio is too large, the ventilation resistance will increase significantly.
It significantly impedes the ease of breathing when worn as a mask,
In addition, there are many spots during paper making, and the furnace water level becomes extremely low, resulting in a problem of reduced productivity.

The wet nonwoven fabric used for the mask of the present invention has a basis weight of 10 to 10.
0 r/i, especially 30 to 70 f7'l, and the ventilation hole at this time is 5 to 6° cr, /cd/s
ee, preferably 1 s to s o cr:, /cd
/sec is desirable.

If the basis weight is too low, the efficiency of collecting fine dust and the like will decrease, and furthermore, the conditions for peeling from the wire during papermaking will become stricter, increasing troubles in production.

Also, if the fabric weight is too large, the air ventilation resistance will be extremely high, making it difficult to breathe when used as a mask.
The feeling of wearing it also gets worse.

Furthermore, if the air permeability is too low, it will reduce the efficiency of capturing fine dust in the air, and if it is too high, it will hinder the ease of breathing when wearing a mask.

In the present invention, organic fibrous fibrils are prepared by (1) mixing two or more types of incompatible synthetic polymers, melt-extruding or spinning), cutting them and then forming them into fibrous fibrils by mechanical means (split method: I!# Kosho 35-9651
(2) A method in which a synthetic polymer is ejected explosively from a high pressure side to a low pressure side at a temperature higher than the boiling point of its solvent, and then beaten and turned into fibrous fibrils (flash spinning method:
(3) Mixing two or more types of incompatible synthetic polymers.

(melt extrusion or spinning), cut and soaked in solvent,
- A method of converting ten thousand polymers into fibrous fibrils using a solvent (
Polymer blend dissolution method: U.S. Patent No. 3,382,305, etc. (4) A method in which an incompatible alkali solution soluble component is blended with a polyester polymer Km polyester, the weight is reduced with an alkali, and then beaten to form a fibrous fibrillation ( Alkaline weight loss beating method: JP-A No. 56-315, etc.), etc.) However, according to the alkali weight loss beating method, papermaking suitability and thermal stability are improved.

Fine dust collection performance 2 In order to produce organic fibrous fibrils by the alkali weight loss beating method, which is particularly preferred because organic fibrous fibrils with excellent strength etc. can be obtained, linear aromatic polyester and the polyester are incompatible. , a mixture with an organic compound soluble in an alkaline solution, such as an organic sulfonic acid metal salt, polyalkylene glycol, etc., is melt-spun and drawn, the resulting fibers are cut into appropriate fiber lengths, and then treated with an alkaline solution; A method in which the material is then beaten and fibrillated is preferred.

Specifically, such linear aromatic polyesters include polyethylene terephthalate, polyethylene terephthalate/isophthalate, and polyethylene terephthalate/isophthalate.
Hexahydroterephthalate, polyethylene terephthalate)/S-(sodium sulfo)isophthalate, poly(p-hexahydrogine.rylene terephthalate),
Poly(diphenylol propane inphthalate) and polyethylene naphthalene dicarboxylate (2% in %)
, 6- and 2,7-isomer derivatives, and hematopoietic methylene bipenzoate), among which difunctional aromatic carboxylic acids such as terephthalic acid, inophthalic acid, naphthalene dicarboxylic acid, diphenyl dicarboxylic acid, etc. As acid components, ethylene glycol, trimethylene glycol,
Tetramethylene glycol.

Linear aromatic polyesters containing glycol such as bexamethele/glycol as a glycol component are preferred, particularly those of the general formula [n represents an integer of 2 to 6]. ] A polyester whose main constituent is a repeating unit represented by the following is used. It goes without saying that part of the acid component and glycol component may be replaced with other trifunctional carboxylic acids and other glycol components, respectively. These polyesters may contain additives such as matting agents, thickeners, pigments, etc., if desired.

In addition, as the organic fiber, any natural fiber, chemical fiber9 or synthetic fiber can be used, but in particular, polyamide fiber,
Thermobile synthetic fibers such as polyester fibers and polyglopyrene fibers are preferred because they improve the peelability of wet paper from wire mesh during paper making and increase the strength of sheet materials, and are particularly useful for organic fibrous fibrils. A linear aromatic polyester similar to the one used above is most suitable.

The mask of the present invention is made of a wet-laid nonwoven fabric made by mixing the organic fibrous fibrils and the organic fibers cut into short pieces at a predetermined ratio and using a wet paper-making method. It is a preferred embodiment to use a wet paper strength agent, a dry paper strength agent, an internally added binder, a fibrous binder, an externally added binder, etc.

Although this wet-laid nonwoven fabric alone may be used as a mask, the surface of the wet-laid nonwoven fabric is usually covered with a fabric such as organic fiber woven or knitted fabric or non-woven fabric that is comfortable to the touch in order to provide a comfortable wearing feeling.

This covering fabric may be of any type as long as it is made mainly of organic fibers, but it may be made of a fabric with as high an air permeability as possible.
o o tx/cd/sec or more is preferred.

Covering methods when using non-woven fabric include paper-combining method,
Examples include forming a coated nonwoven fabric, laminating with a wet paper, and laminating with a rolled paper.

The mask of the present invention protects against pathogens and germs in the air.

It has excellent performance in capturing fine dust, etc., is easy to manufacture, and is flexible because it is mainly made of organic matter.・ A mask that is easy to wear and has excellent processability and does not have any adverse effects on the human body. It is. For this reason, this mask is suitable for use in hospital operating rooms, waiting rooms, and workplaces where fine dust is generated.
Suitable for masks used in clean rooms.

EXAMPLES The present invention will be specifically explained below with reference to Examples, but the present invention is not limited to the following Examples.

In addition, the characteristics of the mask in the examples were measured by the following method.

Average fiber diameter (μm): Paper is made from fibrous fibrils and organic fibers individually, and any position is photographed using a scanning electron microscope (magnification: 2000x for fibrous fibrils, 200x for organic fibers)
, 10 randomly extracted fiber diameters per sheet, total IQ
It was determined by the arithmetic mean of the Q-point readings.

Fabric weight (y/1ry): Measured based on JIS L-1079.

Air permeability (CC/ffl/sec): J I8 L
Pressure loss ΔPC, Hg0) measured using a Frazier tester based on 1079: The ventilation resistance when air was aerated through the filter material at a linear velocity of 4 and 75 cps/sec was determined using a water column manometer.

Transmittance η (Co10i); average particle size 0.3 μm
dioctyl phthalate (DOP) particles are generated and passed through a sheet at a linear velocity of 4.75 am/sec,
Sample some of the air before and after the DOP of each
The particle number concentration (Co, Ci) is calculated using Dan Science fi4
Measured using a 100-type multi-dust cowl and calculated using the following formula: fc.

・Example: Polyethylene Tele7 (v-) (3) obtained by a conventional method
5°C Oo - Intrinsic viscosity measured in chlorophenol bath solution 0
．． 65) was melted at 295°C, pumped with a gear pump, and then fed to a mixed wire screenie heated at 285°C. After metering with a gear pump at 150°C, it was supplied to the mixed screw heated to 285°C. The mixing ratio of sodium alkylsulfonate to polyethylene terephthalate was 4% by weight. A chip-shaped molded proboscis was obtained by extrusion molding the blended polymer mixed with a kneading screw.

After drying, the obtained chips were discharged using a nozzle having a horseshoe-shaped opening in which a part of an annular slit was opened, and melt-spun according to a conventional method to obtain hollow fibers. Combine these raw threads.

It was stretched and heat set to obtain a tow of 170,000 de (denier +1 [denier 1.5)].

After cutting this tow into 3m lengths with a guillotine cutter, a caustic soda aqueous solution kept at 98-1°C at a bath ratio of 1:100 (
ao y/l), treated with stirring for a predetermined time, washed with water, dispersed in dried drained water, made into a slurry with a concentration of 1 yen, and beaten with a disc refiner manufactured by Noya Riki ■ to form a fibrous material. A fibril pulp was obtained. In this case, organic fibrous fibrils with different average fiber diameters were created by adjusting the degree of beating.

m1, prepare polyethylene terephthalate short fibers with round cross sections and various fiber diameters and rut fiber lengths, mix these short fibers with the pulp at a predetermined mixing ratio, and add pulp to the mixed slurry. Then, it was made into paper using a Tappy type standard sheet machine 7 manufactured by Toyo Seiki ■, dehydrated using a coach roll with a light load (soop), and peeled off from a wire mesh.

The obtained wet paper was heated to an air permeability of 150 CC/Cl1l/
Sandwiched in rayon wet non-woven fabric with a sec basis weight of 252/-,
It was dried at IIQ'C under a load of 5t/cd to obtain a mask base material. This base material was processed and sewn into a mask. The experimental conditions and results are shown in the table below.

The organic fibrous fibrils had a diameter of 0.1 μm and were bitten into the unseeded wire mesh, making it difficult to peel off from the wire mesh.Also, the air permeability was low, which hindered breathing when wearing a mask.

The same goes for /I62, which has a small diameter organic fiber.
The diameter of the organic fibrous fibrils was 3 μm 2 ↓ Both the Shimmu 3 and the large organic fiber diameter 44 had extremely poor DOP collection performance and were unsuitable for use as a mask.

In addition, All with less than 5% by weight of organic fibrous fibrils has too high air permeability and extremely low DOP collection performance, while 410 with more than 40Xt% has low air permeability and high respiration. Both were unsuitable for use as a mask.

Paper-making properties of A5 to 9 in the examples were just n, o, 3.
The collection efficiency of μm DOP is somewhat high, and it is easy to breathe when worn as a mask, and it feels good on the skin.
It had a good fit and was suitable as a mask.

Claims (1)

[Scope of Claims] L 5 to 40% by weight of organic fibrous fibrils having an average fiber diameter of 0.1 to 3.0 μm and an average fiber diameter of 3 to 25 μm
A mask characterized by being made of a wet-processed nonwoven fabric mixed with 95 to 60% of organic fiber by weight and wet-processed. 2. Organic fibrous fibrils form a mixture of a linear aromatic polyester and an organic compound that is incompatible with the polyester and is soluble in an alkaline solution, and the resulting molded product is treated with an alkaline solution and then beaten. A mask according to claim 1, which is particularly obtained. & Claim 1 or 2, wherein the organic fibrous fibrils are composed of polyester whose main component is a repeating unit represented by the general formula (n is an integer from 2 to 6).
The mask mentioned in the section