KR102138634B1 - Biodegradable Nonwoven Fabric for Mask and Manufacturing Method Thereof - Google Patents

Abstract

The present invention relates to a biodegradable nonwoven fabric for a mask, and more specifically, to a biodegradable PLA nonwoven fabric for a splash blocking mask with water repellency and a manufacturing method thereof capable of filtering moisture particles of a splash state with a biodegradable material. The manufacturing method of a biodegradable PLA nonwoven fabric for a splash blocking mask with water repellency comprises: a first step of producing a spun-bonding nonwoven fabric with a PLA material of a weight average molecular amount (MW) of 100,000 g/mol or more to be a yarn thickness of 2-5 denier and a weight of 40-80 g/m^2; and a second step of providing a yarn thickness of 1-0.01 denier by stretching and processing the PLA spun-bonding nonwoven fabric of the first step with a heat-compressed embossing roll in an uneven shape and providing facial intake resistance of 60 pa or less. The biodegradable PLA nonwoven fabric for a splash blocking mask with water repellency according to the present invention is decomposed by more than 90% for 6 months under a temperature of 60°C, humidity of 80%, and activated microorganisms at a disposal time. Therefore, the present invention reduces greenhouse gas (CO2) without a harmful environment and filters the moisture particles of the splash state by stretching processing.

Description

Biodegradable Nonwoven Fabric for Mask and Manufacturing Method Thereof}

The present invention relates to a biodegradable non-woven fabric for a mask, and more specifically, while using a biodegradable PLA (PolyLactic Acid) material, a biodegradable PLA non-woven fabric for a splash-blocking mask having water-repellent properties capable of filtering out water particles in the droplet state and It relates to a manufacturing method.

In general, masks are used to block micromaterials in the air and prevent them from entering human respiratory tracts. These masks are classified into various types according to their use. In the case of health masks, they are used to prevent infection by bacteria or viruses.

In particular, when a virus occurs, the frequency of use of the mask for public health is significantly increased, resulting in insufficient production and high price. Due to the nature of the mask, the disintegration period when used after disposal is long after about 100 years and pollutes the environment. There is a problem that can cause environmental hormones.

In addition, if a patient such as KF80 or KF94 is used by a patient or an elderly person, it is difficult to breathe, and there is a problem that splashes may be generated on the edge of the mask or under the face chin.

These disposable masks are manufactured using non-woven fabrics. Non-woven fabrics are sheet-like fabrics made by bonding or tangling fiber aggregates mechanically, chemically, or thermally without going through weaving, weaving, or knitting. A thin felt web arranged in a direction is bonded with an adhesive, or a thermoplastic fiber is mixed in the web to melt and bond by heating or the like.

The nonwoven fabric uses a method in which fibers having a high melting point and fibers having a low melting point are mixed, and a fiber having a low melting point is melted using a difference in melting points between the fibers to be combined with fibers having a high melting point.

Polyester terephthalate (PET) and polyethylene (PE) are used as the fiber with a high melting point, and polypropylene (PP) is used as the fiber with a low melting point. Since a lot of harmful components are detected, when used as a mask fabric, harmful substances are bound to have a huge adverse effect on user hygiene.

In addition, the conventional health mask was developed to protect the wearer of the mask from yellow dust, fine dust, viruses, etc., and is not suitable because it is not developed for blocking its own splash.

KR Registered Patent Publication No. 10-2080005 (2020.02.17) KR Publication No. 10-2019-0121272 (2019.10.25)

The present invention was devised to solve the problems as in the prior art, and is more than 90% decomposed for 6 months upon disposal, is eco-friendly, harmless to the human body, and effectively blocks splash and water-repellent properties that can replace the chemical synthetic PP melt-blown nonwoven fabric. It is an object to provide a biodegradable PLA non-woven fabric for a splash-blocking mask having a method and a method for manufacturing the same.

Biodegradable PLA non-woven fabric for a splash-blocking mask having water-repellent properties according to the present invention for achieving the above object and a method of manufacturing the same

A first step of producing a spunbonded nonwoven fabric so that the weight average molecular weight (MW) of 100,000 g/mol or more PLA material is 2-5 deniers of yarn thickness and 40-80 g/m 2 weight;

A second step of stretching the PLA spunbonding nonwoven fabric of the first step with a concave-convex heat-pressing embossing roll to make the thread thickness 1 to 0.01 denier, and the intake resistance of the face part to be 60 pa or less; It includes.

In addition, the first step is to produce a long-fiber nonwoven fabric with a screw temperature of 230°C and a die temperature of 220 to 230°C, but is compressed to 60 to 110°C with two flat press rolls to produce amorphousness. .

In addition, the second step of the thermo-press embossing roll is made of a concave roll and a convex roll, characterized in that the depth of the concave portion of the concave roll is formed deeper than the protruding length of the convex roll.

In addition, the concave portion has a diameter of 2 to 3 mm, a depth of 1 to 3 mm, and the convex portion is characterized by protruding into a diameter of 1.5 to 2.5 mm, 0.5 to 2 mm.

The biodegradable PLA non-woven fabric for splash-blocking mask having water-repellent properties according to the present invention is decomposed at a temperature of 60° C., 80% humidity and 90% for 6 months under activated microorganisms and reduces greenhouse gas (CO2) without being harmful to the environment. There is an effect that can be done, and there is an effect that can filter out the water particles in the splash state by stretching processing.

In addition, it is not harmful because there is no chemical component, skin trouble does not occur, there is an effect that can be produced at a lower cost than the melt-blown non-woven fabric.

1 is a process diagram of a biodegradable non-woven fabric for a splash barrier mask according to the present invention.
Figure 2 is an exploded enlarged view showing the structure of the heat-pressing embossing roll according to the present invention.
Figure 3 is an enlarged view showing the structure of a thermocompression embossing roll according to the present invention.

Hereinafter, a preferred embodiment of a method for manufacturing a biodegradable PLA nonwoven fabric for a splash-blocking mask having water-repellent properties according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a process diagram of a biodegradable non-woven fabric for a splash barrier mask according to the present invention, FIG. 2 is an exploded view showing the structure of a thermocompression embossing roll according to the present invention, and FIG. 3 is a thermocompression embossing roll according to the present invention. It is an enlarged view showing the structure.

As shown in these drawings, a method for preparing a biodegradable PLA nonwoven fabric for a splash-blocking mask having water-repellent properties according to the present invention is a PLA material having a weight average molecular weight (MW) of 100,000 g/mol or more and a thread thickness of 2 to 5 deniers, 40 to A first step of producing a spanbonded nonwoven fabric to have a weight of 80 g/m 2; A second step of stretching the PLA spunbonding nonwoven fabric of the first step with a concavo-convex heat-pressing embossing roll (1) so that the thread thickness is 1 to 0.01 denier, and the intake resistance of the face part is 60 pa or less; It includes.

The first step is a step of producing a PLA spunbonding long fiber nonwoven fabric.

Span-bonded long-fiber nonwoven fabric is produced from PLA (PolyLacitc Acid) material with a weight average molecular weight (MW) of 100,000 g/mol or more.

At this time, the melt flow index (MI) of the PLA material used is 250 to 30 to 40 g/10min at 2160 g, and the screw temperature is 230°C and the die temperature is 220 to 230°C to produce a long fiber nonwoven fabric.

Here, when a long-bonded non-woven fabric of spanbond is made of PLA material having a molecular weight (MW) of 100,000 g/mol or less, shrinkage may occur during the stretching process of the second step of embossing roll (1).

PLA long fiber non-woven fabric is produced so that the weight is 40~80g/㎡, and the temperature of two flat press rolls is 60~110℃ to make it amorphous.

Here, if the weight of PLA long fiber nonwoven fabric is 40 g/m 2 or less, the embossing roll (1) in the second step is drawn, and water, etc. permeates and the droplet blocking effect decreases. If it is 80 g/m 2 or more, the mask is due to the brittle nature of the PLA material. Adhesion to the face may decrease when worn after manufacture. Preferably, it is suitable to produce PLA spanbonding nonwoven fabric having a weight of 50-60 g/m 2.

And if the flat pressing roll temperature is 110°C or higher, the PLA spunbonding nonwoven fabric is crystallized, so that the stretching is not smoothly performed during the second step of the embossing roll (1) stretching processing.

If the thickness of the thread is 5 denier or more, the moisture permeability is increased, so that the droplet blocking effect may be lowered.

The second step is a step of stretching the PLA spunbonding nonwoven fabric prepared in the first step to have a thread thickness of 1 to 0.01 denier using a concave-convex thermocompression embossing roll 1.

The concave-convex heat-pressing embossing roll 1 is made of steel and a heating device is installed to control the temperature.

The thermal compression embossing roll 1 is made of a concave roll 10 and a convex roll 20, as shown in FIG. 2, but the depth of the concave portion 11 of the concave roll 10 is convex of the convex roll 20. The part 21 is formed deeper than the protruding length. In more detail, the concave portion 11 has a diameter of 2 to 3 mm and a depth of 1 to 3 mm, and the convex portion 21 protrudes from a diameter of 1.5 to 2.5 mm, 0.5 to 2 mm.

If the concave portion 11 and the convex portion 21 are formed in the same size, the non-woven web formation may be lost and the film may be formed by compression of fibers at a roll temperature of 120 to 140°C during stretching. As a result, as shown in FIG. 3, when the concave portion 11 and the convex portion 21 are overlapped, a space must be formed. 11) The size of the space can be adjusted by varying the sizes of the convex portions 21.

When the temperature of the embossing roll 1 during stretching is 120° C. or less, a single yarn phenomenon may occur, and when it is 140° C. or more, PLA fibers may melt or stick.

The overlapping portion of the concave roll 10 and the convex roll 20 is 20 to 40% of the total area, and if it is 40% or more, the pores are eliminated or filmed by compression heat, so that the intake resistance of the face after the mask is 60 Pa or more It can be, and can cause discomfort in breathing.

During the stretching process, the instantaneous compression roll orientation stretching is adjustable according to the shape and size of the convex portion 21, and the output per minute is 8 to 12 m, and the production amount is adjusted according to the speed and temperature of the roll.

The nonwoven fabric manufactured as described above is capable of manufacturing a mask in various forms such as an outer surface, a lining, and a filter of the mask body, and a mask for blocking a droplet and a dental mask can be manufactured, and the moisture permeability can be adjusted without a chemical synthetic water repellent coating process.

[Test]

1. Biodegradable PLA spanbonding non-woven thread thickness: 4 denier (average) non-woven fabric

① 30g/㎡ ② 50g/㎡ ③ 70g/㎡

2. The thickness of the PLA spunbonded nonwoven yarn in which the nonwoven fabric of the above 1 is stretched and processed with an uneven shape hot press embossing roll is 0.1 to 0.2 denier nonwoven fabric.

① 30g/㎡ ② 50g/㎡ ③ 70g/㎡

3. Cut the non-woven fabrics of 1-①, 1-②, 1-③, 2-①, 2-②, 2-③ into 200mm width and 200mm length, fold them in a funnel shape, put them on the cup, and then put them on the cup. After pouring 100 g of water, the time to start falling into the cup was checked.

division 1-① 1-② 1-③ 2-① 2-② 2-③ result Pass 100% immediately 3 minutes later
Penetration start Not permeated for 24 hours

As can be seen through the water permeability test as described above, since it has an effect on blocking the droplets, it can be used as a material for blocking the droplets and dental mask. These non-woven fabrics can be used in two or more layers and can be used in combination with a release material.

1: Embossing roll 10: Concave roll
11: Concave part 20: Convex roll
21: convexity

Claims (5)

A first step of producing a spunbonded nonwoven fabric so that the weight average molecular weight (MW) of 100,000 g/mol or more PLA material is 2-5 deniers of yarn thickness and 40-80 g/m 2 weight;
A second step of stretching the PLA spunbonding nonwoven fabric of the first step with a concave-convex heat-pressing embossing roll so that the thread thickness is 1 to 0.01 denier, and the intake resistance of the face is 60 Pa or less; Method for manufacturing a biodegradable PLA non-woven fabric for a splash-blocking mask having water-repellent properties, characterized in that it comprises a.
The method of claim 1, wherein the first step is to produce a long fiber nonwoven fabric with a screw temperature of 230°C and a die temperature of 220 to 230°C, but produced to be amorphous by pressing with two flat pressing rolls at 60 to 110°C. Method for producing a biodegradable PLA non-woven fabric for a splash-blocking mask having water-repellent properties, characterized by.
According to claim 1, The second step of the thermocompression embossing roll is made of a concave roll and a convex roll, having a water-repellent property characterized in that the depth of the concave portion of the concave roll is formed deeper than the protruding length of the convex roll. Method for manufacturing biodegradable PLA nonwoven fabric for splash barrier mask.
According to claim 3, wherein the concave portion has a diameter of 2 to 3 mm, a depth of 1 to 3 mm, the convex portion is 1.5 to 2.5 mm in diameter, 0.5 to 2 mm for the droplet-blocking mask having water-repellent properties, characterized in that protruding Method for manufacturing biodegradable PLA nonwoven fabric.
A biodegradable PLA non-woven fabric for a splash-blocking mask having water-repellent properties produced by any one of claims 1 to 4.

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