JP2013070825A - Mouth layer base material for sanitary mask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mouth layer base material for a sanitary mask having excellent collection properties of pollen, dust or the like, and breathability, and reducing discomfort when using the sanitary mask for a long time.SOLUTION: This mouth layer base material for the sanitary mask includes at least a three-layer structure of an outer layer, an inner layer, and a mouth layer. The mouth layer base material is applied with lattice-like, polka-dot, or polygonal mesh treatment. In particular, preferably, an opening area of a mesh is 0.5-8.0 mm.

Description

  The present invention relates to a base material for a mouth layer used for a sanitary mask in which at least three layers of an outer layer, an inner layer and a mouth layer are laminated.

In general, a sanitary mask is composed of at least three layers of an outer layer, an inner layer, and a mouth layer. Spunbond or spunlace or dry process nonwoven fabric is used for a spunbond nonwoven fabric as a protective material for the outer layer, a melt blown (MB) nonwoven fabric subjected to electret treatment for the inner layer, and a mouth layer (innermost layer). It is important that the inner layer absorbs pollen and dust, and the outer layer and mouth layer give the sanitary mask shape retention and strength that does not break during handling, and the mouth layer is stuck to the mouth during use. It is also important not to arrive. In addition, as a sanitary mask, comfort when worn for a long time, specifically, difficulty in breathing due to a decrease in breathability, and nausea may not rise from the gap between the mask and face and fogging glasses, etc. It has been demanded.
In response to these requirements, Patent Document 1 discloses that three layers of nonwoven fabric of outer layer / inner layer / outer layer are integrated by embossing to give “back” to the mask substrate, and in particular as an inner layer nonwoven fabric substrate. By using an electret-treated spunbond / meltblown (SM) composite nonwoven fabric or spunbond / meltblown / spunbond (SMS) composite nonwoven fabric, and further reducing the basis weight of the meltblown nonwoven fabric of the inner layer, low pressure loss and high A trapping mask substrate and a mask using the same are disclosed.

JP2009-106468

However, the sanitary mask disclosed in Patent Document 1 has insufficient breathability, and has a problem that uncomfortable feeling of the mouth occurs when the sanitary mask is used for a long time.
Then, this invention aims at providing the mouth layer base material for sanitary masks which is excellent in the collection property and breathability, such as pollen and dust, and reduces the discomfort when using a sanitary mask for a long time. .

  As a result of diligent studies to solve the conventional problems, the present inventors have found that the mouth layer base material of the sanitary mask having a three-layer structure of at least the outer layer, the inner layer, and the mouth layer is mesh-treated. Thus, the present invention has been completed.

  ADVANTAGE OF THE INVENTION According to this invention, the mouth layer base material for sanitary masks which is excellent in collection property, such as pollen and dust, and air permeability, and reduces the discomfort at the time of using a sanitary mask for a long time can be provided. Furthermore, the sanitary mask using the mouth base material of the present invention has a strength that does not break when maintaining its shape or handling.

  The present invention relates to a mouth layer base material of a sanitary mask having a three-layer structure of at least an outer layer, an inner layer, and a mouth layer, wherein the mouth layer base material is subjected to a mesh treatment. Regarding materials.

  In the present invention, examples of the shape of the mesh of the mouth layer include, but are not limited to, a lattice shape, a polka dot shape, and a polygonal shape.

For example, if in the form of a mesh and lattice-like, it is preferable that the opening area of the mesh is 0.5～8.0Mm ^2, and further preferably from 1.0 to 5.0 mm ^2. Moreover, it is preferable that the space | interval of the opening part of a mesh is 1.0-4.0 mm.

When the opening area is smaller than 0.5 mm ² , sufficient air permeability cannot be obtained. On the other hand, if the opening area is larger than 8.0 mm ² , sufficient breathability can be obtained, but the sanitary mask using the mouth layer base material does not have sufficient strength, so that it is damaged during handling. There is.

  In the present invention, the lattice shape means a shape formed by combining straight lines such as “−”, “+”, “x”, or straight lines.

Moreover, when the shape of a mesh is made into a polka dot shape and a polygonal shape, it is preferable that the opening area of a mesh is 1-15 mm < ² >, and it is still more preferable that it is 3-12 mm < ² >. Moreover, it is preferable that the space | interval of the opening part of a mesh is 1-5 mm.

If the opening area is smaller than 1 mm ² , sufficient air permeability cannot be obtained. On the other hand, when the opening area is larger than 15 mm ² , sufficient breathability can be obtained, but the sanitary mask using the mouth layer base material does not have sufficient strength, and thus there is a problem such as breakage during handling. .

  In the present invention, the polka dot shape means a circle, an ellipse, or a shape formed by a combination thereof, and the polygon shape means a triangle, a quadrangle, a pentagon, or a shape formed by a combination thereof. To do.

  In the present invention, the arrangement of the openings of the mesh may be random, or may be regularly arranged vertically, horizontally, diagonally, or the like. When arranged at random, it is preferable that the apparent density is uniform in the sense that the air permeability of the sanitary mask using the mouth layer base material is made uniform.

In the present invention, the opening ratio of the mouth layer base material is preferably 1 to 60%, more preferably 10 to 30%. If the open area ratio is less than 1%, sufficient air permeability cannot be obtained. On the other hand, if the open area ratio exceeds 60%, this sanitary mask using the mouth layer base material is not preferable because it does not have sufficient strength but also impairs the collection of pollen and dust.

The hole area ratio of the mouth layer base material is represented by the sum of the area of the hole per unit area of the base material.

  In the present invention, as the mouth layer base material, pulp, hemp, cotton, rayon, wet nonwoven fabric using various synthetic fibers, dry nonwoven fabric, spunlace, spunbond, melt bond, needle punch, stitch bond, and other nonwoven fabrics, polyester Acrylic, nylon, acetate, rayon, wool, cotton, cotton blended fabrics, knitted fabrics, Japanese paper, western paper, etc. using the above-mentioned raw materials can be used, but from the point of reducing discomfort in the mouth It is preferable to use Japanese paper or Western paper made from pulp, hemp, or synthetic fiber (polyethylene terephthalate fiber).

  In the present invention, the mesh layer is treated on the base layer base material by using a mesh pattern wire in a circular mesh cylinder in a wet paper machine and by moving the mesh wire so that the wet paper is sandwiched after forming the wet paper with a short mesh. There is a method of performing high pressure shower treatment through a mesh wire. There is also a method in which the paper is made in two layers, one of the two layers is a mesh wire, and the other is a normal wire, and the size of the hole is controlled.

  In the present invention, it is possible to apply / impregnate acrylic resin and polyethylene glycol to the mouth base material subjected to mesh treatment, and it is preferable to apply acrylic ester and polyethylene glycol from the viewpoint of reducing mouth discomfort. .

In the present invention, the physical properties of the mouth layer base material having a mesh structure are preferably a basis weight of 10 to 20 g / m ² , a thickness of 45 to 65 μm, and a density of 0.15 to 0.45 g / cm ³ . In addition, the mouth layer base material has a tensile strength of 3.0 N / 15 mm or more, an elongation of 2.0% or more, and a wet tensile strength (in-house method) of 1. If it is 00N / 15mm or more, it is a level which is satisfactory practically.

  In the present invention, the outer layer base material used for the outer layer can be the same as the above-mentioned mouth base material, and it is preferable to perform a mesh treatment from the viewpoint of air permeability.

  In the present invention, the inner layer is not particularly limited as long as it has an ability to adsorb pollen and dust, and is not particularly limited. Spunbond / meltblown (SM) composite nonwoven fabric, spunbond / meltblown / spunbond (SMS) composite nonwoven fabric Spunbond / spunbond / meltblown / spunbond (SSMS) composite non-woven fabric, spunbond / meltblown / meltblown / spunbond (SMMS) composite non-woven fabric, etc. be able to. In addition, the composite nonwoven fabric may be used alone or in combination.

(Measurement method of tensile strength and elongation)
Using a paper piece obtained by cutting a sample into a width of 15 mm and a length of 100 mm or more, under the environment of a temperature of 23 ° C. and a relative humidity of 50%, JAPAN TAPPI No. 71 was measured.

(Measurement method of wet tensile strength)
After immersing the center part of the paper piece which cut | judged the sample into width 15mm x length 100mm or more in water, after wiping off excess water, JAPAN TAPPI No. The measurement was carried out according to No. 71 and defined as the wet tensile strength.

(Measurement method of air permeability)
Using a Filtrona air permeability measuring device (PPM100 type), the volume of air passing through an area of 1 cm ² of the sample when the differential pressure was 100 mmH ₂ O was determined as the air permeability.

[Example 1]
50% by weight of NBKP beaten to Canadian standard freeness 700-730CSF, 30% by weight of Abaca pulp beaten to Canadian standard freeness 700-730CSF, unstretched polyester fiber (fineness 1.2dtex, fiber length 5mm) PET fiber) was mixed with 20% by weight to obtain a papermaking paper.

(Manufacturing method of mouth layer base material)
A wire in which a 1 mm × 2 mm linear shape was formed on the wire at intervals of 0.5 mm vertically and horizontally was produced. This wire was set in a TAPPI standard handrail, and a wet paper obtained by forming a paper stock having a basis weight of 15 g / m ² on the wire was dried to prepare a sheet having a lattice mesh. Subsequently, an acrylic resin and polyethylene glycol were impregnated to obtain a mouth layer base material of the present invention.

(Manufacture of mask and evaluation method of mouth discomfort)
A spunbonded non-woven fabric having a basis weight of 20 g / m ² as an outer layer base material, an MB non-woven fabric having a basis weight of 20 g / m ² as an inner layer base material, and a sheet prepared as described above as a mouth layer base material were stacked to prepare a mask.

  Using the above mask, the degree of wetness and breathlessness of the mask when used for 1 hour was sensory evaluated as mouth discomfort based on the following criteria. Those that did not feel uncomfortable after use were evaluated as ○, and those that felt uncomfortable were evaluated as ×.

  The mouth layer base material having the above-mentioned lattice-like mesh has sufficient strength and air permeability, and a mask using this has no mouth discomfort.

[Example 2]
The mouth layer base of the present invention is the same as in Example 1, except that a wire having a round shape with a diameter of 4 mm is formed on the wire in a polka dot shape at intervals of 4 mm in the vertical and horizontal directions, and a sheet having a polka dot mesh is produced. The material was obtained.

[Comparative Example 1]
A sheet was prepared in the same manner as in Example 1 except that a normal plain weave wire was used for a TAPPI standard handrail, and a mouth layer base material was obtained.
The feeling of use of the mask produced using this mouth layer base material was unpleasant because the mouth became sticky during use.

Claims (1)

A sanitary mask mouth layer base material of a sanitary mask having a three-layer structure of at least an outer layer, an inner layer, and a mouth layer, wherein the mouth layer base material is subjected to a mesh treatment.