JP3999183B2 - Method for producing cosmetic puff - Google Patents

Description

The present invention relates to a method for producing a cosmetic puff in which the joint portion at the periphery of the joining puff formed by fusing and welding the sponge sheet base material is formed to be soft and gentle to the skin, similar to the feel of the cosmetic application surface. About.
The present invention also provides a junction puff having junctions blown-welded sponge sheet substrate in the shape of a cosmetic puff, welding of molding materials have been included in the junction without projections, the joint The present invention relates to a method for producing a cosmetic puff having a frictional resistance value that matches or at least approximates the resistance value of a cosmetic-coated surface.
Furthermore, the present invention relates to a method for producing a cosmetic puff in which the weld strength of the joint portion where the laminated sponge sheets are joined is a joint strength that can withstand stagnation and washing.

  Conventionally, in a cosmetic puff, it is known to mold a sponge sheet into a puff shape to shape the periphery (Patent Documents 3 and 4). Further, a cosmetic puff (Patent Document 1) using a laminated sponge sheet as a base material and a cosmetic puff (Patent Document 5) provided with a new synthetic resin layer as a skin layer on both sides of the sponge sheet are also known. However, the problem that the welded joint at the peripheral edge cut due to thermal welding becomes hard is unavoidable. In addition, in order to avoid the streaky bulge of the joint portion on the side surface, it melts and welds leaving a part of the periphery of a pair of stacked sponge sheets, and the remaining opening of the obtained bag-like weld is turned over. It is also well known that a cosmetic puff is formed by welding the opening (Patent Document 2), but since the part that has been previously cut and welded is inside the joint, the peripheral edge except for a part is flexible. Even in such a case, there is an inconvenience that a reverse process is necessary, mechanical mass production efficiency is poor, and industrial production is impossible.

  Furthermore, a sponge made by laminating sponge sheets with a laminated type puff, compressing the peripheral joints so as to form a curved surface with a uniform bulge from the center of the sponge sheets. Although the puff is also known (patent document 1), the defect that the joint part of the periphery by fusing and welding becomes hard cannot be solved.

Japanese Utility Model Publication No. 47-24779 Japanese Utility Model Publication No. 51-73274 Japanese Patent Publication No.52-30898 Japanese Patent Publication No.53-16340 Japanese Utility Model Publication No.55-08489

As shown in the above-mentioned known literature, it is known to form a joining puff from a sponge sheet base material by fusing and welding it into a puff shape using ultrasonic waves. When applying makeup using the cosmetic puff thus obtained, the flat portion is used for applying the cosmetic to the skin, but the joint at the periphery of the puff is partially applied like a brush. Used when applying. In this way, the hard joints at the periphery can be used to partially apply cosmetics, but even in that case, the joint at the periphery is harder than the flat part, the touch is not good, and it is rough. I don't like what I do.
Junction of a conventional cosmetic puff as described above, a state in which the welding of the sponge material that occurs when welding in order to blow-welded sponge sheet substrate is projected outward, and the projections are the projecting portions becomes hard and raised in streaky Te, the junction is given a foreign body sensation for the hard streak of excitement when the Tsu was skin near, had given a significant discomfort to the user.

In general, cosmetic puff forming a sponge sheet substrate with blown-welded, (1) those soluble adhesive material is flexible and is included in the joint without protruding the junction, (2) joint friction There is a demand for a resistance value that does not change or at least approximates the frictional resistance value of the coated surface part, and (3) that provides a bonding strength excellent in sag resistance.
However, in reality, there is a variation in the thickness of the sponge sheet as the base material and physical properties for each batch in the manufacturing stage, so in the technology for making the heating time (about 2 to 4 seconds) in the conventional process constant, unavoidable variations of soluble adhesion amount and welded state of the sponge sheet material without projections soluble adhesive material, flexible, which is included in the joint, reproducibility those melt strength of the bonding strength with耐揉seen washability I couldn't get well.

  Several attempts have been made to avoid the formation of protrusions and streaks at the welded joints in a cosmetic sponge puff formed by fusing and welding a sponge sheet using an ultrasonic welder. For example, although heating for fusing and welding is performed in a short time, there is no streaking due to the welding residue, but adhesion failure of the joints frequently occurs and defective products continue. On the other hand, in order to prevent adhesion failure of the welded joint, it has been attempted to increase the joining time by ultrasonic heating, but it has not been possible to suppress the occurrence of streaks in the welded joint. In this way, with the conventional fusing / welding technology, the thickness of the sponge sheet substrate and the prescription of the raw material have a large effect on the joint, and it is not possible to set a certain standard fusing / welding condition corresponding to the material variation. It was possible.

An attempt to obtain excellent cosmetic puff less to skin feel the soluble adhesion amount of the joint portion of the side surface of the sponge sheet substrate blowing-welded by ultrasonic heat to above, the bonding failure of the joint occurrence In some cases, the yield rate may be less than 40%, and at the industrial scale, especially the skin feel of the joint at the periphery is excellent, and the makeup with excellent scum washability Puffs could not be manufactured. For these reasons, conventionally, in order to guarantee the bonding strength of the welded joint, it has been unavoidable that the ridges of the sponge sheet base material after fusing and welding are unavoidable to some extent.
Therefore, in the present invention, a cosmetic puff fused and welded using ultrasonic heating has no hard streaks due to the welded material at the side joints, is soft and gentle to the skin, and has excellent scumming washing resistance. The challenge is to obtain a cosmetic puff that has been ideal for many years.

The present inventors, the instantaneous heating time for the time of blowing-welding rather than set to a constant corresponding to the material of the various sponges substrates, solvent deposition states by incorporating shock sensor to the degree of ultrasonic heating by keeping itself constant, it was found to solve the conventional problems by requiring and sufficient solvent deposition amount.
Cosmetic puff of the present invention is to provide soluble adhesive of a sponge material projecting at the junction of the sides, the frictional resistance of the friction resistance between the coating surface of the joint matches or least approximation also It is possible to obtain a joint having a uniform skin feel and excellent sag resistance and washability.

In order to solve the above-mentioned problems, the invention according to claim 1 includes a die metal blade having a slightly flattened tip portion that is cut and welded into a puff shape using a sponge sheet base material, and a mold corresponding to the metal blade. And a method for producing a cosmetic puff using a ultrasonic welder provided with an energization circuit having an electric shock sensor between the metal blade and the mold, and forming a joint portion fused and cut into the puff shape. By the following steps, the spliced sheet base material is melted and welded into a puff shape by using ultrasonic heating, and the friction resistance value (B) of the joint and the cosmetic coating are not projected on the joint. The frictional resistance values (A) of the surfaces are the same or approximate, and the weld strength of the joint is a joint strength that can withstand stagnation and washing.
a) Install a jig equipped with a die-cutting metal blade that cuts and welds into an ultrasonic welder.
b) said cutting die metal blade set to oscillate automatically stops the ultrasound at the same time in contact with the mold.
between the mold and c) said cutting die metal blade, insert the sponge sheet substrate, said cutting die metal blade presses the sponge sheet substrate.
d) An ultrasonic wave is oscillated from the ultrasonic welder while pressing the sponge sheet substrate .
sponge sheet substrate is actuated the electric shock sensor by contact mold and the cutting dies metal blade by being cut by melting by e) ultrasonic heating, heating is stopped oscillation of ultrasonic wave stops.
f) The pressing with the die metal blade is continued until the temperature of the melted portion is lowered, and the welded material formed with an appropriate amount of welding is contained in the joint portion and fixed.
Invention, the ratio of the frictional resistance of the coated surface of the puff frictional resistance of the (A) and the junction (B) (B / A) is characterized by a range of 1.0 to 1.5 according to claim 2 And
The invention according to claim 3 is characterized in that the sponge sheet base material is selected from NR, SBR, NBR, polyurethane and blends thereof.

  In the present invention, when a bonding puff is produced by fusing and welding from a sponge sheet base material using ultrasonic heating to form a cosmetic puff, if the ultrasonic oscillation time is lengthened, the bonding of the puff peripheral edge When the welded material becomes streaky and the oscillation time is shortened, poor bonding occurs at the joint. Thus, when joining a cosmetic puff by welding / cutting by ultrasonic heating, it is important to find the optimal ultrasonic oscillation time, but in practice, joining in the optimal time is It is difficult to control the time of ultrasonic oscillation to obtain a cosmetic puff with an appropriate joint area that is affected by variations in the sponge sheet base formulation and sheet thickness, etc., and does not affect the softness during use. It was.

  Therefore, the present inventors set a current-carrying circuit as a mold opposite to the mold having a metal blade of an ultrasonic welder that uses ultrasonic heating, and provided an electric shock sensor in the current-carrying circuit. As a result, the amount of ultrasonic heating can secure a sufficient amount of welding to guarantee the strength of the welded joint, so that the welded part of the sponge sheet material does not rise to the joint on the peripheral edge of the cosmetic puff, Since the frictional resistance value is equal to the frictional resistance value of the cosmetic-coated surface or approximates the frictional resistance value of the cosmetic-coated surface, the skin resistance can be maintained even when the peripheral joint contacts the skin. It has been found that it provides a cosmetic puff that is soft, soft and gentle to the skin.

According to the present invention, since the electric shock sensor is provided in the energization circuit between the upper and lower forming dies of the ultrasonic welder provided with the ultrasonic heater, the electric shock sensor is instantaneously brought into contact with the die-cutting metal blade at the same time. Oscillation can be stopped immediately upon sensing energization. Accordingly, excessive melting of the sponge material can be prevented, and a strong joint can be formed with an appropriate amount of welding.
As a result, the welded material becomes a streak and is not exposed to the outside, and is contained in the joint, and the friction resistance value of the joint matches the friction resistance value of the cosmetic coating surface, or both The frictional resistance value is approximated. In the present invention, the ratio (B / A) between the frictional resistance value (A) of the coated surface and the frictional resistance value (B) of the joint is about 1 to 1.5. The ratio (B / A) is equal to or 1.5 / 1 or more, for projecting and streaky protrusion of conventional products as well as weld deposit is formed, it becomes possible to use reluctance occurs cosmetic puff, comfortable Sex was not obtained.

The friction resistance value in the present invention was measured according to the friction coefficient test method defined in JIS P8147.
That is, the dynamic friction coefficient (A) of the decorative puff coated surface and the dynamic friction coefficient (B) of the joint were measured on a rubber sheet to obtain the ratio (B) / (A).
The cosmetic puff was folded in a U shape and the tensile stress was measured at a tensile speed of 1 cm / min using a constant speed tensile testing machine with a load of 55 g.

  In addition, the scouring washability in the present invention means that the bonded sponge puff is immersed in 0.2% by weight of a neutral detergent at 40 ° C. for 10 minutes, and then subjected to manual squeezing 20 times, followed by washing with water and dewatering to obtain a bonded state. It investigated and evaluated the scouring washing-proof property by accepting what does not have abnormality, such as joining peeling, in a junction part.

The cosmetic puff obtained in the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a sponge sheet base material for forming the cosmetic puff of the present invention, FIG. 2 is a cross-sectional view when a sponge sheet is interposed between napping fiber sheets, and FIG. FIG. 4 is a cross-sectional view of a state where a sponge sheet substrate is placed on the ultrasonic welder of the present invention in order to form the cosmetic puff of the present invention. 5 is a sectional view after fusing / welding a cosmetic puff according to the present invention, FIGS. 6 and 7 are sectional views of conventional fusing / welding of a cosmetic puff, and FIG. 8 shows a conventional ultrasonic welder.

According to FIG. 1, the sponge sheet base material for forming the cosmetic puff of the present invention comprises an inner sponge sheet 11 having relatively large bubbles and a sponge sheet 12 having relatively fine bubbles.
In the present invention, a cosmetic puff is formed using at least two sponge sheets as a base material in this way, but a sponge sheet is laminated between two raised fabrics in accordance with the purpose. It is also possible to use as a sponge sheet base material, a sheet base material with sponge and synthetic leather, a sheet base material with sponge sheet and fabric, or a sheet base material with sponge sheet and non-woven fabric. is there.

FIG. 2 shows an example of a laminated sponge sheet in which the sponge sheet 11 is interposed between the raised fabrics 15.
As shown in FIG. 3, an ultrasonic welder 1 of the present invention having an ultrasonic oscillation horn jig (not shown) and having an energization circuit between upper and lower molds is prepared. The upper mold 7 is fixed to the upper mold support 2 in the ultrasonic welder. The die-cutting metal blade 4 is fixed to the molding lower die 3 and pressed against the sponge sheet substrate placed thereon to be melted and welded. The die-cut metal blade 4 has an endless annular shape such as an oval shape or a square shape with a rounded corner corresponding to the cosmetic puff, and the tip portion of the blade is slightly flattened. It is appropriate to keep it. The lower mold 3 to which the punching metal blade 4 is fixed is fixed to the support base 6 with a heat insulating material 5 interposed.

An electric shock sensor 8 is interposed in the energization circuit between the lower mold 3 and the upper mold 7 so that the energization is detected at the moment when the die metal blade 4 contacts the upper mold 7 of the ultrasonic welder, and the energization is stopped. Set as follows.
In FIG. 3, the sponge sheet base material 11, 12 is placed on the die-cutting metal blade 4 fixed to the molded lower mold 3, and the sponge sheet base material is blown into a puff shape by lifting the lower mold upward. Weld.
A state in which the upper die and the lower die of the forming die are turned upside down, for example, a punching metal blade is fixed to the upper die, and the sponge sheets 11 and 12 placed on the lower die are directed from above to below. It is also included in the embodiment to move the die-cutting metal blade for fusing and welding.

In order to form the cosmetic puff of the present invention, as shown in FIG. 4, the sponge base sheet is pressed against the upper mold 7 in a state where the sponge sheet base sheet is placed on the punched metal blade. At the same time that the flat part of the tip of the punching metal blade 4 contacts the upper mold 7, the electric sensor 8 detects electrical contact, and at the same time, the operation of the ultrasonic horn is stopped, and it is kept for a short time as it is.・ Complete welding. The degree of fusing and welding can be adjusted according to the flatness of the tip of the metal blade.
As shown in FIG. 5, the cosmetic puff obtained according to the present invention includes the joint 15 of the surface layer, and has no solid protrusions or streaks on the side surface of the peripheral edge. Does not occur.

Since the conventional ultrasonic welder 20 shown in FIG. 8 does not include an ultrasonic oscillating horn, there is no energization circuit between the upper and lower forming dies 24 and 26, and there is no sensor for detecting the contact of the die metal blade. In addition, it is common to use a sharpened die-cutting metal blade. However, when fusing and welding with such a high-frequency welder, in order to guarantee the adhesive strength of the joint, the heating time is set long and the welded part is used. I have to take a big. At this time, as shown in FIG. 6, the joint portion is not included, and a streaky bulge 29 is formed and exposed on the side surface of the periphery. For this reason, there is a feeling of a stiff foreign body when it comes into contact with the skin due to hard protrusions or streaky bulges. Further, when the fusing / welding time at the time of joining is set short in advance in order to avoid this foreign object sensation in the puff, there is no formation of streaks, but as a reverse problem, as shown in FIG. The welding amount is small, resulting in poor bonding. If such a joining puff is washed while being squeezed, the welded part on the side surface will be peeled off immediately.

In the present invention, the frictional resistance value of the joint and the frictional resistance value of the cosmetic application surface, which has been ideal for many years in the cosmetic puff obtained from the sponge sheet base material, match or at least approximate, This embodies a cosmetic puff that has no foreign object feeling. Cosmetic puff of the present invention, projections and streaky mound of soluble adhesion of the sponge sheet substrate which occurs in the bonding portion by blowing-welded peripheral joint requires a minimum amount of puff shape exposed to the periphery Without any resistance to the skin, the skin-friendly cosmetic puff is realized by being encapsulated in the joint, and with the use of an ultrasonic welder equipped with an electric sensor, fusing and reproducibility are excellent. A welded product can be obtained.

  As the sponge sheet substrate used in the present invention, a material selected from NR (natural rubber), SBR (styrene butadiene rubber), NBR (nitrile butadiene rubber) or polyurethane and blends thereof is used. Further, when using a raised fabric or knitted fabric, the ground yarn can be a synthetic fiber such as nylon, polyester or PP.

  The best mode for carrying out the present invention will be described with reference to examples.

Ultrasonic oscillator 200 (BRANSON ULTRASONIC DIV. OF EMERSON JAPAN, LTD. Frequency 20KH) with a puff-shaped die-cutting metal blade with a flat section of 0.3mm and a flat section of 5cm x 4cm. _2. Prepare an ultrasonic welder with 2200W output. In the above apparatus, an energization circuit is provided between the oscillating horn jig and the die-cutting metal blade, and an electric shock sensor is provided in the middle to perform fusing and welding by ultrasonic heating.
Two NBR sponge sheets having a thickness of 4 mm were used as a base material and inserted between the upper and lower molds of the ultrasonic welder. Starts fusing and welding by oscillating ultrasonic waves and pressing the die metal blade against the upper die.
The sponge sheet substrate was melted and welded, and the tip of the die metal blade contacted the lower die. At the same time, the sensor sensed energization and instantaneously stopped the ultrasonic oscillation. While stopping the oscillation of the ultrasonic waves, to continue pressing until the solidification of the soluble kimono.
The thus obtained cosmetic puff and welded material are not exposed at all, and are welded materials contained in the joint , and the friction resistance value (A) of the 10 coated surfaces and the joint The average ratio (B / A) of the frictional resistance value (B) was 1.01 ((B / A) of each sample; 1.00, 1.01, 1.00, 1.03, 1.00, 1.01, 1.01, 1.00, 1.01, 1.00) .
When cosmetics were applied using this puff, a cosmetic NBR sponge applicator having a soft and skin-friendly joint could be obtained. This puff was all passed through the stubborn resistance to washing.

The NBR La Te Tsu box sponge thickness of 2 sheet sponge sheet substrate inserting a polyurethane sponge having a thickness of 5mm between the 2mm inserted into the ultrasonic welder having an ultrasonic horn of Example 1.
Similar to Example 1, the tip of the die-cutting metal blade contacted the lower die, and at the same time, the sensor sensed energization and instantaneously stopped the ultrasonic oscillation. With the ultrasonic oscillation stopped, pressing was continued to complete fusing and welding.
The resulting cosmetic puff, the average ratio of the weld deposit are dissolved wear without protruding from the junction, the frictional resistance of the coated surface (A) and the frictional resistance of the junction (B) (B / A) Was 1.08 ((B / A) of each sample; 1.08, 1.11, 1.07, 1.10, 1.08, 1.07, 1.10, 1.08, 1.07, 1.08).
When cosmetics were applied using this puff, a cosmetic sponge puff having a soft and skin-friendly joint could be obtained. In addition, all the stubborn wash resistance of this puff is acceptable.

A sponge sheet base material in which a polyester nonwoven fabric having a thickness of 5 mm was inserted between two polyurethane sponge sheets having a thickness of 2 mm was inserted into an ultrasonic welder equipped with the ultrasonic horn of Example 1.
As in Example 1, the sensor sensed the tip of the die-cutting metal blade in contact with the lower die, and the oscillation of the ultrasonic wave was stopped instantaneously. The pressing was continued with the ultrasonic oscillation stopped.
The resulting cosmetic puff, without weld material is exposed at all, has a soluble adhesive which is included in the joint, the average ratio of the frictional resistance of the joint portion and the friction resistance of the coated surface (B / A) Was 1.17 ((B / A) of each sample; 1.18, 1.15, 1.16, 1.18, 1.18, 1.17, 1.16, 1.18, 1.17, 1.18).
The obtained sponge puff had a soft and skin-friendly joint when applying cosmetics, and the sag wash resistance was acceptable.

A sponge sheet base material in which a polyurethane sponge having a thickness of 5 mm is inserted between two 2 mm-thick cotton velvets (using nylon as a ground yarn) is inserted into an ultrasonic welder equipped with the ultrasonic horn of Example 1. Then, the same operation as in Example 1 was performed.
The resulting cosmetic puff is in a state of soluble adhesive portion is included in the joint without exposing all. The average (B / A) of the friction resistance value (A) of the coated surface and the friction resistance value (B) of the joint is 1.35 ((B / A) of each sample; 1.32, 1.35, 1.37, 1.35, 1.33, 1.36. 1.34, 1.37, 1.35, 1.37), and a velvet cosmetic puff containing a urethane sponge having a soft and skin-friendly joint could be obtained. All stubborn wash resistance is acceptable.

<Comparative Example 1>
2mm thick laminate was inserted polyurethane sponge sheet having a thickness of 5mm between two NBR La Te Tsu box sponge to be placed between the upper and lower dies of a conventional ultrasonic welder. The conventional ultrasonic welder is not in an electric shock state in which an electric shock sensor is interposed between the upper and lower molds. The die-cutting metal blade was pressed for 2 seconds, and the pressing was continued until the welded material was solidified to complete the fusing and welding.
Although there were no streaky bulges in the joint portion of the obtained puff, some of them had poor adhesion, and the inner polyurethane sponge layer protruded outward.
At the same time that the cosmetic was applied using this, the remaining joints were destroyed and the internal sponge layer was exposed to the outside.

<Comparative example 2>
A laminate in which a polyurethane sponge sheet having a thickness of 5 mm is inserted between two 2 mm thick raised fabrics is placed between the upper and lower sides of a conventional ultrasonic welder.
As in Comparative Example 1, the die-cutting metal blade was pressed for 4 seconds, and the pressing was continued until the welded material was solidified.
The resulting streaky Moriaga Rigaa is at the junction of the puff is, this part is hard, was not good skin feel at the time of use.

<Comparative Example 3>
Of on ultrasonic welder Comparative Example 1, between the NBR La Te Tsu box sponge two thicknesses of 2mm by inserting a 5mm thick polyurethane sponge to substrate.
This base material sheet was placed between the upper and lower molds of the ultrasonic welder, and a die metal blade was pressed.
There is no electric shock sensor between the upper and lower molds of the ultrasonic welder.
The conditions of ultrasonic oscillation are as shown in Table 1.

Table 1 shows the properties of the cosmetic puff depending on the difference in the conditions of ultrasonic oscillation.

* (B) / (A) is 1.6
2 * (B) / (A) is 1.9
3 * (B) / (A) is 2.3
4 * Measurement not possible

<Summary of results>
When fusing and welding are performed using the ultrasonic welder of the present invention, the ratio (B / A) of the friction coefficient (A) of the coated surface to the friction coefficient (B) of the joint is within a certain range, particularly 1.0. A velvet cosmetic puff containing urethane sponge having a soft and skin-friendly bond in the range of ˜1.5 can be obtained, and the sachet washing resistance is all acceptable. On the other hand, in the case of the comparative example, when the welding time is short, a large number of poor bonding occurs, and even if apparently bonded, it is easily peeled off by washing. On the contrary, when the welding time was long, there was a streaky bulge at the joint, and the usability was poor. And, it takes time to determine the appropriate welding time corresponding to each sponge base material, set a suitable welding time once set, and even if fusing and welding at that time, individual sponge sheet material itself Due to the variation, bonding failure due to insufficient welding time and hard joints due to excessive welding time occurred at a high rate.

Sectional drawing of the laminated body for forming the cosmetic puff of this invention Sectional drawing of the laminated body in which the sponge sheet was interposed between the raised fiber sheet of this invention Sectional view when the laminate is placed on an ultrasonic welder to form the cosmetic puff of the present invention Sectional view during fusing and welding using the apparatus of the present invention, Sectional drawing of the cosmetic puff in this invention, Cross-sectional view of a conventional cosmetic puff (excessive adhesion) Cross section of conventional cosmetic puff (adhesion failure) A conventional welder is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ultrasonic welder 2 Forming upper mold 3 Molding lower mold 4 Cutting metal blade 5 Insulating material 6 Lower mold support base 8 Electric shock sensor 11 Sponge sheet 12 Sponge sheet 15 Side joint 20 Conventional ultrasonic welder 21 Sponge sheet
22 Sponge sheet 23 Lower mold support base 24 Molding upper mold 25 Punching metal blade 26 Molding lower mold 27 Molding upper mold support base 29 Streaky protrusion on the periphery of the puff

Claims (3)

A die-cutting metal blade with a slightly flattened tip portion that is cut and welded into a puff shape using a sponge sheet base material and a forming die corresponding to the metal blade, and an electric sensor is provided between the metal blade and the forming die Using an ultrasonic welder provided with an energization circuit, a method for producing a cosmetic puff for forming a joint part fused and welded to the puff shape,
Through the following steps, the sponge sheet base material is melted and welded into a puff shape by using ultrasonic heating so that the welded portion does not protrude into the joint portion, and the friction resistance value (B) of the joint portion and the cosmetic coating surface A method for producing a cosmetic puff, wherein the frictional resistance value (A) coincides or approximates, and the weld strength of the joint is a joint strength that can withstand stagnation and washing.
a) Install a jig equipped with a die-cutting metal blade that cuts and welds into an ultrasonic welder.
b) said cutting die metal blade set to oscillate automatically stops the ultrasound at the same time in contact with the mold.
between the mold and c) said cutting die metal blade, insert the sponge sheet substrate, said cutting die metal blade presses the sponge sheet substrate.
d) An ultrasonic wave is oscillated from the ultrasonic welder while pressing the sponge sheet substrate .
sponge sheet substrate is actuated the electric shock sensor by contact mold and the cutting dies metal blade by being cut by melting by e) ultrasonic heating, heating is stopped oscillation of ultrasonic wave stops.
f) The pressing with the die metal blade is continued until the temperature of the melted portion is lowered, and the welded material formed with an appropriate amount of welding is contained in the joint portion and fixed. The cosmetic (1) according to claim 1, wherein the ratio (B / A) of the frictional resistance value (A) of the coated surface of the puff and the frictional resistance value (B) of the joint is in the range of 1.0 to 1.5. Puff manufacturing method. The method for producing a cosmetic puff according to claim 1 or 2, wherein the sponge sheet substrate is selected from NR, SBR, NBR, polyurethane and a blend thereof.