JPH04170902A - Pad for skin and production thereof - Google Patents

Abstract

PURPOSE:To provide the pad for the skin which is soft and obviates the hooking and hit to the skin by superposing plural sheets of non-woven fabrics contg. thermoplastic fibers, ultrasonically sealing and melt cutting these fabrics to a wire shape and sealing the powder to be applied to the skin therein. CONSTITUTION:Fiber webs of 100% side-by-side type composite fibers consisting of two components of polypropylene and modified polypropylene are subjected to a waterflow slip treatment and two sheets of such webs are laminated. Talcum powder is sprayed by 2g each at 10cm interval and further, one sheet of the water-flow slip non-woven fabric is laminated thereon. The talcum powder is held mainly in the middle water-flow slip non-woven fabric. The laminate is inserted between a circular cylindrical ultrasonic horn and a cylindrical metallic die which is cylindrical and is formed with a cylindrical blade at one end in such a manner that the center of the talcum powder of the laminate comes to the center of the metallic mold. This laminate is cut to a circular shape and simultaneously, the peripheral edge is ultrasonically welded under ultrasonic conditions of 3kg pressurization and 0.4 second oscillation. Since the broad hardened part by the welding is not formed in the circumferential part of the pad for the skin, there is no hooking to the skin and this pad is particularly suitable for babies.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a skin pad and a method for manufacturing the same. Specifically, the present invention provides a skin pad whose peripheral edge is soft and does not catch or touch the skin, and a method for manufacturing the same.

(Prior Art) Heat sealing and high frequency sealing are conventionally known as techniques for sealing and fusing multiple sheets of nonwoven fabric into a pad shape.

(Problems to be Solved by the Invention) However, in conventional skin pads that have been heat-sealed, as shown in FIG. Since the periphery (3) is sealed, it is necessary to conduct sufficient heat, so it is exposed to high temperature for a relatively long period of time, forming a film, and the area around the seal part also becomes a film due to the heat during heat sealing. The texture had become hard.

On the other hand, with high-frequency sealing, the constituent fibers of the non-woven fabric sandwiched between the electrodes absorb high-frequency electromagnetic field energy and generate heat, and the periphery of the non-woven fabric is thermally fused and sealed.
The amount of heat generated by the high frequency was extremely large, and the sealed portion was formed into a film, similar to the heat sealing process described above.

In addition, the heat generated by the high frequency waves spread not only to the contact area of the electrode but also to the surrounding area, and the area around the seal area also became a film and had a hard texture.

For this reason, in conventional skin pads whose periphery is cut and sealed by heat sealing or high-frequency sealing, the filmed portion tends to tear due to deterioration, and the sealed portion of the filmed periphery or its surroundings may be damaged during use. It had the problem of getting caught or hitting the skin, and could not be used as a skin pad.

The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a skin pad whose peripheral edge is not formed into a film and is soft and does not catch or hit the skin. .

(Means and effects for solving the problem) In order to achieve the above object, the invention according to claim 1 provides the following: "A plurality of nonwoven fabrics containing thermoplastic fibers are stacked, and the periphery of this nonwoven fabric is exposed to ultrasonic waves. The gist of the product is "a skin pad that is linearly sealed and fused with a non-woven fabric, and a skin-appropriate powder such as baby powder is encapsulated between the non-woven fabrics."

In addition, in the invention as claimed in claim 2, ``a plurality of nonwoven fabrics containing thermoplastic fibers are laminated, and then this nonwoven fabric is sandwiched between an ultrasonic horn and a mold having a blade-like tip, and ultrasonic waves are applied to the nonwoven fabric. The gist of the method is ``a method for manufacturing a skin pad, which is characterized by a step of linearly sealing and fusing, and a step of injecting a skin-applicable powder such as baby powder between nonwoven fabrics.''

Hereinafter, the skin pad of the present invention and its manufacturing method will be explained.

As shown in FIGS. 1 and 2, the skin pad (11) of the present invention is obtained by cutting and sealing the periphery (20) of a plurality of laminated nonwoven fabrics (12).
This is a product in which a skin-applicable powder (I4) such as baby powder is encapsulated in ET.

As the non-woven fabric (I2) disposed on the surface layer of the skin pad (It) of the present invention, the skin-applicable powder (I4) encapsulated in the non-woven fabric (12) (12) rW1 is used during use. 1
1) The size of the skin-applicable powder (14) is determined so that it can come out to the surface and so that the skin-applicable powder (14) does not easily come out on the surface of the pad (11) when not in use. It is preferable that gaps are formed between the constituent fibers of the non-woven fabric (12) in accordance with the size of the fabric. In this regard, since the size of the gap between the constituent fibers of the nonwoven fabric (12) can be easily adjusted, the nonwoven fabric (12) used for the pad (11) may be made of fibers such as hydroentangled nonwoven fabric or needle punched nonwoven fabric. A nonwoven fabric in which fibers are bonded to each other by entanglement is preferred. The constituent fibers of the non-1a fabric (12) are preferably fibers made of thermoplastic resin such as polyethylene, polypropylene, polyamide F, etc., which are easily fused by ultrasonic waves. Also, please
The content of thermoplastic fibers in the cloth is desirably at least 30% or more from the viewpoint of sealing strength. Furthermore, the constituent fibers of the nonwoven fabric (12) are preferably thin and bulky.
You can get a pad that is soft and comfortable to the touch. Examples of such fibers include splittable fibers that are easily split when the fibers are entangled.

The non-woven fabric (13) disposed on the inside may be the same as the non-woven fabric disposed on the surface layer, but the skin-applicable powder (14) may be the same as the non-woven fabric disposed on the surface layer.
), it is desirable to have a bulky structure that can distribute and retain the powder three-dimensionally. For example, needle-punched nonwoven fabric made by applying needle-punching treatment to fiber clothing made of highly crimped polyester fibers, or heat-treated fiber wear made from composite fibers with a core-sheath structure with polyethylene as a sheath component and polyester as a core component. , a bulky nonwoven fabric in which fibers are bonded to each other by a polyethylene component, etc. are preferable. The nonwoven fabric (I3) disposed on the inside only needs to be sealed with the nonwoven fabric on the front side, and the periphery does not necessarily need to be sealed by ultrasonic cutting together with the nonwoven fabric on the front side. Therefore, it is not necessary to contain thermoplastic fibers.

It should be noted that the skin pad (11) does not necessarily need to have a non-woven fabric (13) on the inside to hold the skin-applicable powder, but simply in the space between the non-woven fabrics forming the surface. The skin-applicable powder may be simply encapsulated in the skin. Furthermore, the number of nonwoven fabrics (13) placed inside can be one or more depending on the intended use or anticipated usage conditions. Furthermore, instead of non-m cloth (13), continuous ′jK
A urethane foam sheet having Wi is placed between the nonwoven fabrics,
It is also possible to hold powder for skin application within the open cells of this urethane foam sheet.

The part of the periphery (20) of this skin pad (11) that is sealed and fused by ultrasonic waves is connected to the ultrasonic horn (I6) with a flat surface of the laminated nonwoven fabric (12) and one of the cylindrical parts. Only the part sandwiched between the mold (15), which has a blade-like tip, generates heat due to the ultrasonic imaging, and is cut at the same time as the ultrasonic wave #1 is attached, so that a thin wire is generated. It is not film-like. Therefore, the sealed portion of the peripheral edge (20) of the skin pad (eye) does not catch or hit the skin when the pad (11) is used.

The shape of the blade-shaped mold (15) can be changed as appropriate, such as a circumferential shape, an elliptical shape, an oval shape, etc., depending on the shape of the intended skin pad.

The skin-applicable powder (14) enclosed in the nonwoven fabric (12) (12) of the skin pad (11) is, for example, cosmetic powder, baby powder, drug powder, soap powder, or powder used for gymnastics. It is not particularly limited to non-slip powder. In addition, the skin-applicable powder (14) is made of a nonwoven fabric (1
In order to prevent the powder from coming onto the mold (I5) during the ultrasonic cutting and sealing process that follows during lamination in 2), it may be sprinkled on the nonwoven fabric (12) at predetermined intervals, or after sealing. The injection may be performed using an atomizer or the like.

In addition, in the skin pad of the present invention, a synthetic resin film may be laminated on the nonwoven fabric on one side surface, and the synthetic resin film may be melted and sealed together with other nonwoven fabric.

In this case, the skin-applicable powder encapsulated in the pad will not spill out from the synthetic resin film side of the outer surface, and your hands will not get dirty during use.

In the skin pad (11) configured as described above, the skin application powder (1
4) moves within the gap formed in the constituent fibers of the nonwoven fabric (12) according to the size of the powder to be applied to the skin,
-It is gradually coming out to the surface. Also,
When not in use, the skin-application powder (14) does not move within the gaps between the constituent fibers of the non-woven fabric (12), and the skin-application powder (14) does not come out from the surface of the pad.

Next, a method for manufacturing a skin pad according to claim 2 will be explained.

Note that the nonwoven fabric containing thermoplastic II fibers, the nonwoven fabric disposed inside, and the skin-applicable powder are the same as those described above, and therefore their explanations will be omitted.

First, as shown in FIGS. 1, 2, and 3, a plurality of nonwoven fabrics (12) containing thermoplastic fibers are laminated. Although the number of nonwoven fabrics (12) to be laminated is not particularly limited, the larger the number of laminated nonwoven fabrics (12), the bulkier and softer the skin pad (11) can be obtained.

In addition, when laminating the nonwoven fabric (12) containing thermoplastic fibers, a bulky nonwoven fabric (13) that can three-dimensionally distribute and hold the skin-applicable powder (14) between the nonwoven fabrics (12) is used.
Alternatively, a urethane foam sheet having open cells that holds the skin-applicable powder may be provided. Furthermore, a synthetic resin film may be laminated on one surface of the non-woven fabric (12) to prevent the skin-applicable powder in the pad from spilling out from the synthetic resin film surface on the outer surface.

Next, the laminated nonwoven fabric (12) is sandwiched between a pillar-shaped ultrasonic horn (16) with a flat surface and a cylindrical mold (15) with one tip shaped like a blade, and pressurized 3 .0~4.0
kg, ultrasonic welding is performed under ultrasonic conditions of oscillation of 0.4 to 0.7 seconds. At this time, the blade-shaped mold (15) of the nonwoven fabric (12)
The portion sandwiched between the ultrasonic horn (16) and the ultrasonic horn (16) having a flat surface generates heat due to ultrasonic vibration, and is simultaneously ultrasonically fused and cut. In addition, the part that generates heat due to ultrasonic vibration is a blade-shaped mold (15) made of nonwoven fabric (12).
) and the ultrasonic horn (16) with a flat surface, so it does not spread to the surrounding area. Therefore, the sealed portion becomes linear and does not become film-like. As a result, a linear seal portion exists on the periphery (20) of the skin pad (II), and the seal portion of the periphery (20) is caught on the skin when the pad (11) is used. It doesn't hit me too hard.

Next, a skin-applicable powder (14) such as baby powder is injected into the linearly sealed and melt-cut nonwoven fabric (12) using an atomizer or the like. Incidentally, the injection of the skin-applicable powder may be performed prior to the ultrasonic fusion step.

(Examples) Hereinafter, the skin pad of the present invention and its manufacturing method will be described in detail according to Examples.

Actual JL Example - side-by-side type composite fiber consisting of two components of polypropylene and modified polypropylene (fineness 2 denier, fiber length 44 AUW) 00x fiber web was subjected to hydroentanglement treatment, and water flow with a basis weight of 100 g/m2 An entangled nonwoven fabric was created.

Next, two sheets of this hydroentangled nonwoven fabric were laminated, and 2 g of heavenly pollen was sprinkled thereon at intervals of lOcm, and one sheet of the above hydroentangled nonwoven fabric was further laminated thereon. At this time, the sky pollen is mainly held in the hydroentangled nonwoven fabric in the center.

After this, a cylindrical ultrasonic horn with a diameter of 14 cm and a
The above-mentioned laminate was sandwiched between molds having a 0c+w cylindrical shape with a circumferential blade at one end so that the center of the scattered sky pollen was at the center of the mold, and was shaped into a circle with a diameter of 10 cm. At the same time as cutting, apply ultrasonic waves to the periphery using 3 kg of pressure and 0.4 seconds of oscillation. I made a skin pad by wearing it.

The obtained skin pad is convenient to carry, and when it is flapped against the skin, heavenly pollen comes out from inside, making it easy to apply heavenly pollen. In addition, since no wide hardened portion was formed on the circumferential portion of the skin pad by fusion bonding, there was no catching on the skin, making it particularly suitable for use on babies. In addition, the seal strength by ultrasonic fusion was 1.5 kg and 15 cm width.

Kantaneketsu 1 The same hydroentangled nonwoven fabric used in Example 1 was subjected to needle punching on a fiber garment made of 100% high-crimp type polyester fiber (fineness 2.5 denier, fiber length 51 m5+). Layer two-dollar punch nonwoven fabric with a basis weight of 150 g/s2, and add 2 g of white powder for 10 c each.
The mixture was sprayed at intervals of m, and the hydroentangled nonwoven fabric was further laminated thereon.

This laminate was processed using the same device as in Example 1, with a diameter of 10 mm.
At the same time, the skin pad was cut into a cm-sized circle and the periphery was ultrasonically fused under the ultrasonic conditions of applying a pressure of 3.5 kg and oscillating for 0.7 seconds.

The resulting skin pad does not leak powder, especially when carried.
When you slap it on your face, white powder comes out from inside and can be used for makeup.

A laminate consisting of two layers of the same hydroentangled nonwoven fabric as used in Example 1 was cut into a circle with a diameter of 10 cm+ using the same equipment and under the same conditions as in Example 1, and at the same time the periphery was subjected to ultrasonic treatment.・
The waves were fused.

Next, 3 g of heavenly pollen was injected between the nonwoven fabrics using an atomizer to prepare a skin pad.

During ultrasonic welding, if there is powder on the mold, which has a circumferential blade, there is a risk that the powder will be scattered due to vibrations caused by the ultrasonic waves, but in this example, powder Since it is injected later,
There is no need to worry about that.

Jitsu JL Doctor” 1 Core-sheath type composite fiber with polyethylene as a sheath component and polyester as a core component (woven density 2 denier, Il! male length 51m5+
) is heat-treated and the fibers are bonded together with a polyethylene component to a thickness of 3.0 m-1 and a fabric weight of 20.
A laminate is formed by sandwiching a bulky nonwoven fabric of g/i2 between two sheets of the same hydroentangled nonwoven fabric as used in Example 1.

Next, this laminate was cut into a circle with a diameter of 10 cm using the same equipment and under the same conditions as in Example 1, and at the same time, the periphery was ultrasonically fused.

Thereafter, 3 g of heavenly pollen was injected between the nonwoven fabrics using an atomizer to obtain a skin pad.

The obtained skin bat had a very voluminous feel and a soft texture due to the action of the bulky non-woven fabric inside.

(Effects of the Invention) With the above configuration, in the skin pad according to claim 1, the portion sealed and fused by ultrasonic fusion is formed linearly along the periphery of the skin pad. It just exists. For this reason, as with skin pads sealed with conventional heat seals or high frequency seals, the sealed area is spread over a wide area, and the heat from the heat seal or high frequency seal spreads around the sealed area, forming a film and giving it a hard texture. The periphery of the skin pad is soft, and the sealed portion of the periphery of the pad does not catch or hit the skin during use.

Furthermore, in the skin pad of the present invention, by increasing the number of laminated nonwoven fabrics, it is possible to obtain a pad with a very voluminous feel and a soft texture. .

Further, according to the method for manufacturing a skin pad according to claim 2, only the portion sandwiched between the blade-shaped mold of the nonwoven fabric and the ultrasonic horn generates heat due to ultrasonic vibration and is ultrasonically fused. They will be disconnected at the same time. Further, since the portion that generates heat due to ultrasonic vibration is limited to the portion sandwiched between the blade-shaped mold of the nonwoven fabric and the ultrasonic horn, it does not spread to the surrounding area. As a result, a skin pad with a soft peripheral edge that does not catch or hit the skin can be manufactured.

[Brief explanation of drawings]

FIG. 1 is a partially sectional perspective view showing the skin pad of the present invention;
Fig. 2 is an enlarged cross-sectional view of the main parts of the skin bat of the present invention, and Fig. 3 is a schematic diagram showing how the laminated nonwoven fabrics are sealed into a predetermined shape by ultrasonic welding and then fused. FIG. 4 is an enlarged sectional view of the main part schematically showing a conventional skin pad. Explanation of symbols (12)...Nonwoven fabric, (13)...Nonwoven fabric inscribed in the skin pad, (1
4)...Powder for skin application, (15)...Mold, (
16)...Ultrasonic horn.

Claims (2)

[Claims] (1) Multiple sheets of nonwoven fabric containing thermoplastic fibers are layered,
A skin pad characterized in that the periphery of the nonwoven fabric is linearly sealed and fused by ultrasonic waves, and a skin-applicable powder such as baby powder is sealed between the nonwoven fabrics. (2) a step of laminating a plurality of nonwoven fabrics containing thermoplastic fibers, then sandwiching the nonwoven fabric between an ultrasonic horn and a mold with a blade-like tip, and sealing and fusing the nonwoven fabric into a linear shape using ultrasonic waves; 1. A method for producing a skin pad, comprising the step of injecting a skin-applicable powder such as baby powder between non-woven fabrics.