JPH0330129Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the invention of a mask, and provides a mask that is comfortable to wear, has high particle collection efficiency, and can effectively prevent the invasion of bacteria and viruses. This is what I am trying to do.

It has been common practice to use a mask to prevent fine particles, bacteria, and viruses from entering and adhering to the oral cavity, nasal cavity, and even the eyes, and from dissipating the bacteria and viruses.
In conventional masks, the material used is, for example, multiple layers of gauze, or a piece of non-breathable material is perforated to make it breathable, but a piece of cloth like gauze is placed inside it. Generally, they are used in layers, and in any case, because they are intended to prevent the above-mentioned intrusion or dissipation using a thick layered structure, they require a large amount of materials and are multi-layered. The ventilation resistance due to the tissue is large, making it impossible to wear comfortably. Especially in recent years, masks have been widely used in various factories and work sites to prevent dust, smoke, and prevent inhalation of harmful or allergenic particles or components such as spray mist or sparks. A worn mask has high ventilation resistance and is not comfortable to wear, resulting in a decrease in work efficiency. Moreover, in the conventional products as mentioned above, the material itself used does not effectively prevent the transmission of fine particles or mist, but the multilayering merely reduces the probability of transmission. Therefore, it is not possible to accurately prevent the permeation of these harmful components. Of course, it is not suitable for continuous wear over a long period of time.

The present invention was devised after repeated studies in view of the above-mentioned circumstances, and utilizes a breathable resin material made of a stretched porous resin film for a mask to be attached to the mouth or eyes as described above. For example, we propose a stretched porous tetrafluoroethylene resin film containing a liquid anti-friction film made by extruding a polymer with an appropriate degree of crystallinity (95% or more) of tetrafluoroethylene resin into a sheet. After the agent has been vaporized and removed, the polymer is stretched in one direction or more at a stretching ratio of 10%/sec or more at a temperature lower than the crystalline melting point of the polymer to form a porous structure. An example of a resin film is shown schematically in FIG. That is, as a result of the above-mentioned stretching, long holes 21 are formed in the film along the stretching direction, and thin fiber strips 22 are densely arranged between the knots 23, so that it looks like a film to the naked eye. However, since countless long holes 21 are formed between the fiber strips 22, excellent air permeability can be obtained. Although the drawing shown in FIG. 1 is for a case in which the stretching direction is one direction, a case where the drawing direction is in two or more intersecting composite directions is separately shown in FIG. 2. In other words, the state of formation of the thin fiber strips 22 is the same as that shown in FIG. The knots 23, which were formed in different directions, are almost completely dissolved and become fiber strips 22, and as a result, the formation relationship of the fiber strips 22 and the long holes 21 between them is basically the same as in FIG. However, the fibers 2 of the knot 23
The directions of the fiber strips 22 formed by dilation are crossed, forming a complex intertwined structure of fiber strips as shown in FIG. 2 described above. The size of the elongated holes 21 formed between the groups of 22 fiber strips as described above is such that the maximum pore diameter is 5 to 50 μm, especially, according to the methanol bubble point method that is generally adopted for measuring this type of tissue. 7-20μm, especially 10
By obtaining a material with a thickness of ~15 μm, sufficient air permeability can be obtained when used as a mask. The maximum pore diameter according to the methanol bubble point method is calculated from the pressure at which pressurized air passes through a continuous porous membrane soaked in methanol and the surface tension of methanol. It means the diameter of the maximum pore when a group of pores is regarded as a circular hole, and the void between the elongated holes 21 or the fiber strips 22 described above is the diameter of the hole in either of FIGS. It is generally known in the textile technology that substantially the same maximum pore diameter can be obtained by the methanol bubble point method, and the fiber strip 22 can be made to have excellent strength by the above-mentioned drawing. The fiber strips 22 formed densely as described above have high collection efficiency for fine particles,
For example, even fine particles around 0.5 μm or smaller can be effectively collected with a probability of 95% or more. Note that such porous resin films can also be obtained by using porous materials containing other resin coating materials, and can be laminated to other fabrics or nonwoven fabrics for reinforcement or shaping purposes as appropriate. can be used.

That is, the porous breathable resin film 1 as described above can be used as a single layer, but as mentioned above, even if the fiber strips 22 have strength, they do not support the strength as a thin layer film material. In order to accurately obtain shapeability as a mask, it is practical to use a laminate of other fabrics 2 or nonwoven fabrics 3 as shown in FIG. The laminate may be applied to either the inside or outside of the resin film 1, or may be laminated on both sides of the resin film 1. These fabrics 2 or nonwoven fabrics 3 are, of course, breathable materials, and even if they are laminated, they do not impede the breathability of the porous resin film 1 as described above, and of course reduce its particulate trapping efficiency. There is no such thing. The representative masks shown in Figure 3 are selected as appropriate depending on the usage status of each mask, and those using fabric 2 etc. on the inside have a good feel to the face, and those using fabric 2 etc. on the outside. This prevents the thin breathable resin film 1 from coming into contact with other objects and being damaged. A device in which fabric 2 or the like is layered on the inside and outside can achieve any of these purposes.

The material shown in Figure 3 above is obtained industrially as a flat sheet, but since this material is also a resin material as mentioned above, it is heated to around its softening point and placed in a mold. By inserting the mask, it can be formed into a desired mask shape. In this way, the use of molds and the like can be adapted to various mask forms, and in order to obtain a mask from the above-mentioned planar sheet, for example, it is cut into a piece of material 10 as shown in FIG. 4. That is, the material piece 10 is provided with joining edges 11, 11 facing each other, and a folded part 12 is formed adjacent to one of the joining edges 11, 11, and the joining edges 11, 11 are welded, glued, or sewn. At the same time, the folded part 12 is folded back, and a molded piece 15, which can be appropriately molded to fit the shape of a nose, etc., such as a thin piece of mild steel, is inserted and adhered, thereby creating a mask as shown in FIG. A main body 5 is obtained, and a hanging string 6 can be attached to the main body 5 to produce a product. As for the hanging string 6, a plurality of hanging strings 6 may be attached to both sides, but as shown in the figure, the middle part of one hanging string 6 is attached to the middle of the top of the mask main body 5, and both ends are attached to both sides of the mask main body 5. If it is attached, there are few attachment parts to the mask body 5, and it can be attached easily.

The mask body of the present invention has the effect of trapping or blocking the passage of fine particles, liquid fine particle mist, bacteria, viruses, etc., so basically it is necessary to have auxiliary gauze inside. It is clear that even if gauze or the like is used for the gap formed between the face and the face, a relatively small amount is sufficient, and there is no need to fill it in multiple layers as in the past. In special cases, it is possible to absorb harmful gas components if an activated carbon layer or the like is used in combination or an adsorbent layer is used, but in any case, the entire surface of the mask body 5 effectively acts as a ventilation layer. Therefore, all of the absorbent or adsorbent layers provided inside or outside can be effectively utilized. In addition, when it is used as a mask for the eyes, it is of course formed as a mask body that covers one or both eyes.

To explain the effect of the above-mentioned device according to the present invention, the above-mentioned stretched porous tetrafluoroethylene resin film has a maximum pore diameter of 12 to 13 μm (generally 10 to 15 μm) by the methanol bubble point method described above. The collection rate for fine particles of 0.5 μm is 99.68%, and for 0.7 μm it is 99.98%.
At 1.4 μm, it is 99.996%, and since the elongated voids due to stretching are formed at a high density between the fiber strips in approximately the same direction or in complicated directions, the ventilation resistance is extremely low and it is impermeable to water. Therefore, fine particles such as smoke, liquid fine particle mist, and pollen can be effectively collected even if they are bacteria or viruses.Furthermore, since they are easily charged with static electricity, they cannot be attracted or passed through by electrostatic attraction or repulsion. In any case, a highly efficient particulate collection or passage prevention effect can be obtained, and in addition, as mentioned above, the low ventilation resistance makes it comfortable to wear and comfortable for workers, etc. Enables continuous use for long periods of time.

Furthermore, since the collection of fine particles according to the present invention is carried out on the surface of the film, the collected fine particles can be removed by simply wiping them off. On the other hand, when fine particles are collected using a nonwoven fabric, the fine particles penetrate into the inside of the nonwoven fabric, so it is not easy to remove them. Furthermore, since the film of the present invention is water-impermeable, it does not allow liquid fine particle mist to penetrate into it, but in the case of non-woven fabrics, penetration of liquid fine particle mist cannot be prevented.

According to the present invention as explained above, the outstanding fine particle collection efficiency of the breathable resin film material by the stretched porous resin film is fully utilized, and moreover, the elongated substantially parallel or intricately oriented fibers obtained by the stretching process are The high-density fine voids in which the strips 22 intertwine and intertwine can sufficiently reduce ventilation resistance and provide a mask that is comfortable to wear.
Although it is thin, it has a high film strength and has sufficient durability and chemical resistance, so it will not be attacked by corrosive mist, etc. It uses electrostatic attraction or repulsion due to the fact that it is easily charged to prevent the passage of fine particles, and is used for general dustproofing, skiing, motorcycles, etc.
For cold resistance and wind protection when running, etc., it is used for sanitary purposes against hardening bacteria and viruses, when painting or using aerosols, for anti-smoking purposes against cigarette smoke, for avoiding inhalation of smoke in the event of a fire, for controlling allergy-causing particles such as pollen, etc. It can be used widely and has excellent effects such as not causing discomfort even when worn continuously for long periods of time due to its excellent breathability as mentioned above. It's a big idea.

[Brief explanation of the drawing]

The drawings show embodiments of the invention,
Figures 1 and 2 are respectively enlarged plan views of one example of the stretched porous resin film material used in the present invention, Figure 3 is a sectional view of some examples of the material, and Figure 4 is a cross-sectional view of some examples of the material. A developed view of the material piece, and FIG. 5 is a perspective view showing an example of a mask according to the present invention. In these drawings, 1 is a stretched porous resin film, 2 and 3 are fabrics or non-woven fabrics, 5 is a mask body, 6 is a hanging strap, 10 is a piece of material, 11 is a joining edge, 12 is a folded part, and 15 is a molded part. It shows a piece.

Claims (1)

[Claims for Utility Model Registration] 1. A polytetrafluoroethylene resin having a continuous porous microstructure interconnected by a large number of fine nodules obtained by drawing the polytetrafluoroethylene resin, and having long pore-like voids formed into fiber strips. A mask characterized in that it is formed using a breathable porous resin film formed in between. 2. The mask according to claim 1, which is a registered utility model, wherein the elongated pores have a maximum pore diameter of 1 to 10 μm as determined by the methanol bubble point method. 3 The polytetrafluoroethylene resin film is stretched in the cross directions to eliminate most of the fine nodules, and the fiber directions are intersected to form a highly densified open-porous microstructure with complex intertwined fibers. The mask according to claim 1 or 2 of the utility model registration claim.