JP2016000701A - Cellulose fiber nonwoven fabric for gel mask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cellulose fiber nonwoven fabric for a gel mask which can retain a large amount of gel, is high in transparency under a wet condition, and has excellent handleability and a good feeling of wearing (touch).SOLUTION: A cellulose fiber nonwoven fabric for a gel mask has a weight of 10 g/mor more and 30 g/mor less, a thickness of 0.01 mm or more and 0.4 mm or less, an amount of gel retention of 25 g/g or more and 60 g/g or less, and a gel diffusibility of 1000 mmor more and 2000 mmor less. There is also provided a gel mask comprising the same.

Description

  The present invention relates to a cellulose fiber non-woven fabric for a gel mask that has a high amount of gel retention, high transparency when wet, and excellent handling properties and wearing feeling (touch properties).

  Conventionally, gel masks are used for pack materials and patch materials used for beauty and the like as those capable of expressing functions such as enhancing the water retention of the skin surface. In recent years, for example, Patent Document 1 below has reported a gel sheet characterized by having high strength using a woven fabric or nonwoven fabric as a support. On the other hand, as disclosed in Patent Document 2 below, as a thin nonwoven fabric, a cellulose fiber nonwoven fabric having high transparency and less resistance to wearing has also been developed.

However, the development of a non-woven fabric for gel masks for beauty, whose demand has been increasing in recent years, has not been sufficient yet, and has the following problems.
(1) Although a support is used in order to maintain high strength, the amount of gel retained is poor and the cosmetic effect cannot be maximized.
(2) The gel penetration time into the support is slow and the processing speed cannot be increased.
(3) The end face of the support hits the skin when wearing a mask, and irritation to the skin cannot be denied.

JP 2009-108006 A Japanese Patent No. 5339690

  The problem to be solved by the present invention is for a gel mask that can solve the above-mentioned problems of the prior art, has a high amount of gel retention, has high transparency when wet, and is excellent in handling and wearing feeling (skin feel). It is to provide a cellulose fiber nonwoven fabric.

As a result of intensive studies and experiments conducted by the present inventors to solve the above problems, a cellulose nonwoven fabric having a basis weight of 10 g / m ^{2 to} 30 g / m ² and a thickness of 0.01 mm to 0.4 mm. In order to form a gel holding part, the gel holding amount is 25 g / g or more and 60 g / g or less by drying after applying hydroentanglement by sandwiching the nonwoven fabric with at least one kind of net. The inventors have found that a desired cellulose fiber nonwoven fabric for gel mask can be obtained by setting the gel diffusibility to 1000 mm ² or more and 2000 mm ² or less, and have completed the present invention. That is, the present invention is as follows.

[1] The basis weight is 10 g / m ² or more and 30 g / m ² or less, the thickness is 0.01 mm or more and 0.4 mm or less, the gel holding amount is 25 g / g or more and 60 g / g or less, and the gel diffusion. Cellulose fiber nonwoven fabric for gel mask characterized by having a property of 1000 mm ² or more and 2000 mm ² or less.

  [2] The cellulose fiber nonwoven fabric for gel mask according to [1], wherein the Young's modulus ratio in a wet state is 6.0 or less.

  [3] The cellulose fiber nonwoven fabric for gel mask according to [1] or [2], wherein the cellulose fiber is a regenerated continuous cellulose fiber.

  [4] The cellulose fiber nonwoven fabric for gel mask according to any one of [1] to [3], wherein an average fiber diameter of the cellulose fibers is 7.2 μm or more and 20.0 μm or less.

  [5] A gel mask comprising the cellulose fiber nonwoven fabric according to any one of [1] to [4].

  The face mask using the cellulose fiber nonwoven fabric of the present invention is a gel mask having high gel retention, high transparency when wet, and excellent handleability and wearing feeling.

Hereinafter, embodiments of the present invention will be described in detail.
The cellulose fiber used in the present embodiment is not particularly limited, and examples thereof include regenerated cellulose fibers such as copper ammonia rayon, viscose rayon, tencel (lyocell), polynosic, and natural cellulose fibers such as cotton, pulp, and hemp. The cellulose fibers are preferably regenerated cellulose fibers. The cellulose fiber may be either a continuous long fiber or a short fiber, but the continuous long fiber is more excellent in lint-free property and liquid absorption than that of the short fiber. The fiber diameter of the cellulose fiber constituting the nonwoven fabric is preferably 7.2 μm or more and 20.0 μm or less, more preferably 7.2 or more and 18.0 μm or less, and still more preferably 10.0 μm or more and 18.0 μm or less. When the fiber diameter is less than 7.2 μm, the number of fibers increases and the texture becomes hard, so the feeling of wearing a face mask is lowered. On the other hand, when the fiber diameter is larger than 20.0 μm, the permeation rate is reduced and the processing rate is reduced. .
The cellulose fiber nonwoven fabric for gel mask of this embodiment desirably contains 80% or more of the cellulose fiber, more preferably 90% or more, and still more preferably 95% or more. When the cellulose fiber is less than 80%, the gel retainability and the liquid absorption speed are not sufficient, and a sufficient function as a gel mask material is not exhibited.

As the cellulose fiber nonwoven fabric of this embodiment, a cellulose fiber nonwoven fabric to which a binder or a surfactant has been added is liable to decrease in water absorption or elution of components. The basis weight of the cellulose fiber nonwoven fabric is 10 g / m ² or more and 30 g / m ² or less, preferably 10 g / m ² or more and 28 g / m ² or less, more preferably 13 g / m ² or more and 28 g / m ² or less. is there. If the basis weight of the cellulose nonwoven fabric is less than 10 g / m ^2, the handling property is significantly reduced due to too thin, impractical, on the other hand, if greater than 30 g / m ^2, handling property is superior, transparency decreases.

  The thickness of the cellulose fiber nonwoven fabric of this embodiment is 0.01 mm or more and 0.40 mm or less, preferably 0.03 mm or more and 0.35 mm or less, more preferably 0.05 mm or more and 0.3 mm or less. If the thickness of the cellulose non-woven fabric is less than 0.01 mm, the strength is weak and the fabric may break when impregnated with the gel. On the other hand, if the thickness is greater than 0.40 mm, the transparency when wet and the penetration rate of the gel are reduced. In addition, the feeling of wearing a face mask (touchability, skin contact) decreases.

  The gel retention amount of the cellulose fiber nonwoven fabric of this embodiment is 25 g / g or more and 60 g / g or less, preferably 25 g / g or more and 55 g / g or less, more preferably 30 g / g or more and 55 g of the nonwoven fabric's own weight. / G. When the cellulose fiber nonwoven fabric has a gel retention amount of less than 25 g / g, the gel retention amount as a gel mask is low and does not exhibit a sufficient function. On the other hand, when the cellulose fiber nonwoven fabric is greater than 60 g / g, the gel mask has followability to the skin. Since it decreases, the feeling of wearing (touchability, skin contact) decreases.

The gel diffusibility of the cellulose fiber nonwoven fabric of this embodiment is 1000 mm ² or more and 2000 mm ² or less, preferably 1000 mm ² or more and 1900 mm ² or less, more preferably 1100 mm ² or more and 1800 mm ² or less. When the gel diffusibility of the cellulose nonwoven fabric is less than 1000 mm ² , the gel permeation rate is slowed down and the processing speed is reduced. On the other hand, when the cellulose non-woven fabric is greater than 2000 mm ² , the gel retention amount is increased to follow the skin as a gel mask. The nature will decline.

  The Young's modulus ratio in the wet state of the cellulose fiber nonwoven fabric of this embodiment is preferably 6.0 or less, more preferably 5.8 or less, and still more preferably 5.6 or less. When the Young's modulus ratio in the wet state of the cellulose nonwoven fabric is larger than 6.0, the form stability is deteriorated, and the handleability as a gel mask is lowered. The Young's modulus ratio is preferably 0.2 or more from the viewpoint of form stability and followability to the skin.

  The gel applied to the cellulose fiber nonwoven fabric for gel mask of the present embodiment is not particularly limited, and may be in a gel state containing gelatin, agar, agar, collagen, hyaluronic acid, natural gel (aloe, etc.).

  The cellulose fiber nonwoven fabric of the present embodiment can be produced by shaking the spun yarn onto a net and laminating it into a sheet, then hydroentangling and passing through a drying step. As a manufacturing characteristic of the cellulose fiber nonwoven fabric of the present embodiment, in the hydroentanglement step, hydroentanglement can be performed by sandwiching at least one kind of net. In the hydroentanglement process, the hydroentanglement is carried out by sandwiching at least one type of net, thereby producing a fiber density difference, whereby a large amount of gel can be retained in the fiber sparse part, and the gel permeation time Can be shortened. Furthermore, in the hydroentanglement process, it has been found that the morphological stability of the resulting cellulose fiber nonwoven fabric is improved by interleaving at least one type of net with hydroentanglement. This is considered to be due to the fact that a dense nonwoven fabric structure having a low elongation was formed by the fiber dense portion.

  EXAMPLES Hereinafter, although an Example etc. demonstrate this invention concretely, this invention is not limited to only these Examples at all. First, measurement methods used in Examples and the like are shown below.

(1) Weight per unit area (g / m ² )
The 0.05 m ² or more of the area of the cellulosic fibrous nonwoven fabric, after drying to constant weight at 105 ° C., 20 ° C., allowed to stand in a thermostatic chamber of RH 65% 16 hours or more and measuring the mass of the nonwoven fabric ^{m 2} The hit mass (g) was determined.

(2) Thickness (mm)
The cellulose fiber nonwoven fabric was measured with a load of 1.96 kPa in a thickness test in accordance with JIS-L1096.

(3) Gel retention amount (g / g)
When a cellulose fiber nonwoven fabric of A (g) is immersed in a gel with a viscosity of 40 mPaS (a moisturizing lotion made from a specialized cosmetic liquid, measurement temperature: 25 ° C.) for 16 hours, and then suspended vertically to remove liquid ( The mass B (g) at the time when the initial gradient was almost zero was measured, and the gel retention amount (g / g) was calculated by the following formula.
Gel retention amount (g / g) = {(BA) / A}

(4) Gel diffusibility (mm ² )
Four pieces of cellulose fiber nonwoven fabric of 5 cm square are piled up, and 0.5 mL of gel with a viscosity of 40 mPaS (moisture lotion type made from specialized essence, measurement temperature: 25 ° C.) is dropped on it, and after 10 seconds, one sheet The length C (mm) diffused in the vertical direction in the nonwoven fabric of the eye, the length D (mm) diffused in the horizontal direction, and the length E (mm) diffused in the vertical direction in the fourth nonwoven fabric and diffused in the horizontal direction The measured length F (mm) was measured, and the gel diffusivity (mm ² ) was calculated by the following formula.
Gel diffusivity (mm ² ) = (C × D) + (E × F)

(5) Young's modulus ratio In a wet state (state dipped in pure water for 16 hours and suspended vertically to eliminate dripping), the cellulose nonwoven fabric is stretched according to JIS-L1096 in the machine direction and in the direction perpendicular to the machine direction. The Young's modulus was measured by a test, and the Young's modulus ratio was calculated by the following formula.
Young's modulus ratio = Young's modulus in the machine direction / Young's modulus in the direction perpendicular to the machine direction

(6) Fiber diameter (μm)
The cellulose fiber nonwoven fabric was observed at a magnification of 10,000 times using a scanning electron microscope and JSM-6380 manufactured by JEOL, and an average value obtained by selecting and measuring 50 arbitrary fibers was defined as a fiber diameter.

(7) Handleability (points)
Sensory evaluation of handleability was performed with 20 subjects. The evaluation method and the judgment level are as follows, and an average value of 20 people was used as a sensory evaluation value for handling the sample.
Evaluation method: Cellulose nonwoven fabric extracted into a face mask mold was folded in four, and the ease of opening the wet sample was evaluated according to the following criteria.
<Criteria>
5: Can be spread without spears 4: Can be speared but can be spread without frustration 3: Normal 2: Frustrated but can be spread over time 1: Cannot be spread

(8) Transparency when wet (%)
A cellulose fiber nonwoven fabric of 5 cm × 5 cm is placed on a mesh (10 mesh, wire diameter: 0.5 mm), and this is placed in water in a bat and immersed for 30 seconds. Thereafter, the mesh is pulled up and left for 10 minutes, and then excess water and an aqueous solution are wiped off with a filter paper or the like. A wet non-woven fabric is sandwiched between glass plates, the L value is measured 5 times using an integrating sphere method SM-T manufactured by Suga Test Instruments Co., Ltd., and the average value G is used to determine the transparency (%) when wet. Was calculated. At this time, the L value of the glass plate alone was also measured five times, and the average value was taken as H.
Transparency when wet = 100- (GH)

(9) Touch (point)
Sensory evaluation of the touch was performed with 20 test subjects. The evaluation method and the judgment level are as follows, and the average value of 20 people was used as the sensory evaluation value of the touch of the sample.
Evaluation method: The inner side of the upper arm of the left hand was lightly rubbed with a 10 cm × 10 cm wet sample, and each sample was evaluated according to the following criteria.
<Criteria>
5: Soft and skin irritation is not felt.
4: I feel a smooth stimulus.
3: A weak and rough feeling is felt.
2: Feels rough irritation.
1: I feel a tingling stimulus.

[Example 1]
After spinning and scouring a cupra nonwoven fabric by a known method, the nonwoven fabric is once peeled off by a peeling roll, and then the upper layer net 18 mesh (the number of meshes per inch is 18) in the next step, the lower layer net It was sandwiched between 10 mesh nets, applied with a pressure of 15 kg / cm ² , entangled with a water needle and dried. The net speed is 48 m / min. Met. The nonwoven fabric obtained had a basis weight of 17.5 g / m ² , a thickness of 0.14 mm, and a fiber diameter of 14.3 μm. Table 1 below shows the evaluation results of the properties and handling properties of the obtained nonwoven fabric.

[Example 2]
Net speed is 34 m / min. The nonwoven fabric was obtained on the conditions similar to Example 1 except being. The nonwoven fabric obtained had a basis weight of 24.8 g / m ² , a thickness of 0.28 mm, and a fiber diameter of 13.1 μm. Table 1 below shows the evaluation results of the properties and handling properties of the obtained nonwoven fabric.

[Example 3]
Net speed 60m / min. The nonwoven fabric was obtained on the conditions similar to Example 1 except being. The nonwoven fabric obtained had a basis weight of 11.9 g / m ² , a thickness of 0.07 mm, and a fiber diameter of 15.8 μm. Table 1 below shows the evaluation results of the properties and handling properties of the obtained nonwoven fabric.

[Example 4]
Hydroentanglement was performed on a fiber having a dry weight of 30 g / m ² formed from a solvent-spun cellulose filament spun using N, N-dimethylformamide as a solvent. Otherwise, a nonwoven fabric was obtained under the same conditions as in Example 2. The nonwoven fabric obtained had a basis weight of 29.3 g / m ² , a thickness of 0.31 mm, and a fiber diameter of 12.9 μm. Table 1 below shows the evaluation results of the properties and handling properties of the obtained nonwoven fabric.

[Comparative Example 1]
The cupra non-woven fabric was spun and scoured by a known method, entangled in water, and then dried. The net speed is 48 m / min. Met. The nonwoven fabric obtained had a basis weight of 17.5 g / m ² , a thickness of 0.15 mm, and a fiber diameter of 13.2 μm. Table 1 below shows the evaluation results of the properties and handling properties of the obtained nonwoven fabric. The gel retention amount was 24 g / g, the gel diffusibility was 990 mm ² , the Young's modulus ratio was 7.3 and the shape stability was poor, and the handling property as a gel mask was not very good.

[Comparative Example 2]
Spinning solution discharge port diameter is halved and net speed is 55 m / min. The nonwoven fabric was obtained on the conditions similar to the comparative example 1 except being. The nonwoven fabric obtained had a basis weight of 14.9 g / m ² , a thickness of 0.09 mm, and a fiber diameter of 4.8 μm. Table 1 below shows the evaluation results of the properties and handling properties of the obtained nonwoven fabric. The gel retention amount is 17 g / g, the Young's modulus ratio is relatively high at 6.1, the shape stability is poor, the handling property as a gel mask is not so good, and especially the touch evaluation is 3 (feels weak and rough) ) Was bad.

[Comparative Example 3]
The characteristic measurement and evaluation of natural cellulose fiber (cotton gauze) were performed. The basis weight was 29.9 g / m ² , the thickness was 0.39 mm, and the fiber diameter was 11.1 μm. Table 1 below shows the evaluation results of the properties and handling properties of the obtained nonwoven fabric. The gel retention amount was 13 g / g, the gel diffusibility was 700 mm ² , the transparency was bad at 61.2%, and the touch evaluation was particularly bad at 2.2.

  As shown in Table 1, the cellulose fiber nonwoven fabric of this embodiment was excellent in handleability, transparency, and touch as a gel mask.

  The cellulose fiber nonwoven fabric of the present invention can be suitably used as a cellulose fiber nonwoven fabric for gel masks because it has a high gel retention, high transparency when wet, and excellent handleability and wearing feeling (feel).

Claims (5)

The basis weight is 10 g / m ² or more and 30 g / m ² or less, the thickness is 0.01 mm or more and 0.4 mm or less, the gel holding amount is 25 g / g or more and 60 g / g or less, and the gel diffusibility is 1000 mm. ^A cellulose fiber non-woven fabric for gel mask, which is ² or more and 2000 mm ² or less.   The cellulose fiber nonwoven fabric for gel mask according to claim 1, wherein Young's modulus ratio is 6.0 or less in a wet state.   The cellulose fiber nonwoven fabric for gel masks according to claim 1 or 2, wherein the cellulose fibers are regenerated cellulose continuous long fibers.   The cellulose fiber nonwoven fabric for gel masks according to any one of claims 1 to 3, wherein an average fiber diameter of the cellulose fibers is 7.2 µm or more and 20.0 µm or less.   The gel mask containing the cellulose fiber nonwoven fabric of any one of Claims 1-4.