JPH0811422B2 - Ultrasonic welding device for wig base net - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an ultrasonic welding device for a wig base net and a wig base for a net material welded using this device.

[Conventional technology and problems]

A wig that uses a net material as a wig base has advantages such as being lightweight and excellent in breathability,
Various types have been conventionally used. Nylon is usually used as the net material, and various methods are known for producing a wig base from such nylon fibers. Among them, for example
According to the method disclosed in Japanese Patent Publication No. 61-124615, a wig base that has a contour and dimensions that accurately match the head shape of a user and that can maintain good mold holding properties even after long-term use is provided. Obtainable.

In this method, as shown in FIG. 2, the wig is first shaped directly from the user's head and formed into a substantially hemispherical shape that substantially conforms to the contour and size of the user's head shape. A wig base, that is, a net type is manufactured by using the male shape 1 of the head shape.

Here, an example of a method of forming the head-shaped male die 1 will be described. First, a female mold is formed that conforms to the shape of the user's head. As the female material, a thermoplastic synthetic resin sheet, for example, a thin plate of trans-type polyisoprene having a thickness of about 2 to 7 mm is preferably used. This female mold applies the synthetic resin sheet to the holding frame and heats and softens it against the user's head to evenly press it, and after the synthetic resin sheet cools and hardens, the user's head It is made by removing it from the part. Next, the support base 2 is inserted into the female mold, and a molding material, for example, gypsum slurry is poured and hardened, and after hardening, the female mold is removed to faithfully restore the head shape of the user. The partial shape male mold 1 is completed.

Next, in the above-mentioned head shape male die 1, first, for example, a thickness of 0.3 mm
The following thin synthetic resin film 3 is coated over the entire surface thereof. The synthetic resin film 3 is used to facilitate the separation of the net mold from the head-shaped male mold 1 in a later step described later.

Furthermore, the head-shaped male die 1 is entirely covered with an ultrathin first net 4 of a proper size, for example, a net having a small diameter mesh such as nylon stockings, from above the synthetic resin film 3. This first net 4 prevents the resin film from forming on the mesh of the second net when the second net used in the next step for forming the wig base is resin-processed by dipping. Is used for.

Next, the head-shaped male die 1 is entirely covered with the second net 5, which is the main material of the wig base, from above the first net 4. The second net 5 is formed by plain weaving at intervals so that each of the filaments of the warp and the weft constituting the net has preferably a rhombic mesh. The second net 5 may be formed by stacking two pieces in consideration of the durability of the wig base. Thus, the synthetic resin film 3, the first net 4, and the second net 5 are sequentially coated on the head-shaped male die 1 so that wrinkles and slacks do not occur, and these edges are formed on the support base 2. It is converged at a position and fixed via a fixing member 6 such as a rubber ring or a cord.

Subsequently, the head-shaped male mold 1 is fixed upside down on a support base and inverted to be immersed in a resin liquid for coating, for example, a polyurethane resin liquid adjusted to an appropriate concentration with a diluent, or by a brush or the like. When the resin solution is dipped by applying the resin solution and the resin solution is dried, the second net 5 is formed.
Is temporarily molded in a state in which the shape of the head-shaped male die 1, that is, the head shape of the user is maintained. Temporarily molded second
The net 5 is peeled off from the head-shaped male mold 1 through the peeling synthetic resin film 3, and thus a net mold N is obtained which has a shape corresponding to the head shape of the user.

Finally, the contact points of the filaments constituting the net type N obtained as described above are placed on the working surface of the ultrasonic welding apparatus W and ultrasonically welded as shown in FIG.

The net type N obtained in this way is durable and retained in a shape that exactly matches the shape of the head of the user, and then cut into a predetermined size to complete the wig base net.

However, in the wig-based manufacturing method as described above, when ultrasonic welding of the filament contact points by the ultrasonic welding device W is performed, the work surface on which the net type N of the ultrasonic welding device W is mounted is a mirror surface. Because it is finished,
Since the ultrasonically welded portion of the outside of the net type N, that is, the outer surface of each filament, is once melted and solidified again during welding, it becomes smooth according to the working surface of the ultrasonic welding apparatus W. When using a net type N to make a wig, the smooth part above receives and reflects light, so this net base becomes conspicuous through the gap between the hair dividing part and the hair. There is a risk of being easily visually recognized by a third party.

[Object of the Invention]

In view of the above points, the present invention has an object to provide an ultrasonic welding apparatus for a wig base net, which prevents the welded portion of the outer surface of each filament of the net type from becoming smooth during ultrasonic welding. I am trying.

[Means and Actions for Solving Problems]

According to the present invention, when the wig base net is ultrasonically welded, the working surface on which the net mold to be welded is placed has a surface roughness (R _Z = 15 to 120 μm, preferably 80 μm). This is achieved by an ultrasonic welding device characterized in that it is formed into a fine uneven shape so as to have JIS B0601).

Preferably, the work surface is roughened by blasting.

According to this invention, since the work surface of the ultrasonic welding device has fine irregularities formed by the rough surface finish, the net is constructed when ultrasonically welding the intersections of the filaments of the wig base net. When the outer surface of each filament is once melted by ultrasonic welding, it takes a shape with a surface roughness according to the work surface formed on the rough surface and solidifies in this state, so for the above wig base Even if the portion of the outer surface of the filament where the outer surface of the filament is ultrasonically welded receives light, it diffuses the light and suppresses the surface gloss unique to synthetic fibers. It will not be easily known.

Further, when the roughened work surface is formed on the surface of the work plate which is separate from the ultrasonic welding apparatus main body, even if the surface roughness of the work surface is worn by repeated ultrasonic welding work. The work plate only needs to be replaced, and when the work plate is made of a stainless steel plate, the surface roughness of the work surface is less likely to be worn, and therefore the work plate need not be replaced due to wear.

〔Example〕

Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 shows an embodiment of an ultrasonic welding device for a wig base net according to the present invention. The ultrasonic welding device 10 has a main body constructed in the same manner as a conventional ultrasonic welding device.
11 and a work plate 13 on a work table 12 of the main body 11. The work plate 13 may be formed integrally with the work table, but is preferably mounted separately and replaceably. The work plate 13 may be, for example, an iron plate, stainless steel (SU
S304) Plate or plate made of hard material such as titanium alloy, and the surface 13a as the working surface is R _Z (10-point average roughness)
= 15 to 120 μm surface roughness (JIS B0601, ie ISO R46
8) is blasted, for example, by spraying alumina powder.

Here, when the upper limit of R _Z , that is, R _Z = 120 μm is exceeded, the surface roughness of the surface 13a of the work plate 13 due to the blasting is too rough, and therefore, when the wig base net is ultrasonically welded, the filament The unevenness of the surface 13a of the work plate 13 bites into the surface, the workability of ultrasonic welding is reduced, and the strength of the filament itself is reduced and the filament is easily cut. Further, when the lower limit of R _Z , that is, R _Z = 15 μm or less, the surface roughness of the surface 13a by blasting is too fine, and therefore the non-smoothness of the welded portion of the wig base net generated during ultrasonic welding is effective. Therefore, the matting is insufficient and the reflection of light by the welded portion of the wig base net can hardly be prevented.

Thus, as a result of various experiments conducted by the present inventors,
Considering both the workability of the ultrasonic welding of the wig base net and the non-smoothing of the ultrasonic welding portion, the surface roughness of R _Z = 80 μm is the most effective in achieving the matte effect. confirmed. The maximum height R _max due to the size of the powder material for processing used during blasting, ten-point average height R _Z, and the center line average height R _a is as follows.

For 120 μm powder, R _max = 200 μm R _Z = 120 μm R _a = 11 to 20 μm For 15 μm powder, R _max = 25 μm R _Z = 15 μm R _a = 1.5 to 2.5 μm For 80 μm powder, R _max = 115 μm R _Z = 80 μm R _a = 13 to 16 μm The embodiment of the ultrasonic welding apparatus according to the present invention is configured as described above, and the ultrasonic welding of the wig base net N is performed as shown in the figure. When the wig base net N is placed on the work plate 13 mounted on the work table 12 of the sonic welding device 10 and a desired ultrasonic welding work is performed, each cross-contact of the filament is welded, At the same time, the outer surface of the filament of the net type N is also once melted and non-smoothed, that is, fine irregularities are imparted according to the shape of the blasted surface 13a of the work plate 13, and the surface is roughened by solidifying as it is. It In this way, the ultrasonically welded wig base net does not have its welded portion smoothed by ultrasonic welding, so when a wig is produced using this wig base net, the outer surface of the filament of the net forming the wig is The ultrasonically welded portion does not reflect light and is therefore sufficiently matt.

It is convenient that the rough surface finishing work of the net type N is performed at the same time as the ultrasonic welding of the filament contact points after the temporary forming of the net type N by resin dipping, and the ultrasonic welding device used at that time outputs an output, for example. 450 ~ 2000W, horn diameter 20 ~ 50
mm, horn pressure 1.5 to 6.0 kg / cm ² , horn pressure time 0.
Set to 2-0.8 seconds. At that time, the smaller the horn diameter is, the more preferable it is, considering the necessity of maintaining the accurate head shape of the net type N after ultrasonic machining, but the larger diameter is preferable in consideration of work efficiency. Therefore, from the above, a more preferable horn diameter is 30 to 50 mm. If the horn diameter is determined, the output of the ultrasonic welding device will be set according to it, but if the output is too small, the welding of the filament contact will be incomplete, and conversely if it is too large, the strength of the nylon filament after ultrasonic processing will be reduced. In addition, the strength of the horn pressure and the length of the horn pressure time similarly affect the strength of welding and the strength of the nylon filament. Therefore, as a result of an experiment by the present inventors combining the above-mentioned points, the horn diameter is 30 to 50 mm as described above, the horn output is 600 to 1800 W, and the horn pressure is 2.0 to 5.0.
Using an ultrasonic welding device set to kg / cm ² and a horn pressure time of 0.2 to 0.6 seconds and performing the welding work by setting the work surface 13a to the surface roughness described above, together with the reliable welding of the filament contact point, It has been found that a good rough surface finish on the filament outer surface can be achieved.

The work plate 13 is preferably made of a material having a hardness as high as possible in terms of wear resistance, and is preferably made of stainless steel (SUS304), but other materials such as a titanium alloy can also be used. Is.

The ultrasonic welding apparatus according to the present invention can be widely applied to a woven or non-woven wig base using a net material, and is not limited to the case of the wig base according to the above-mentioned applicant's JP-A-61-124615. Is. For example, US Patent No.
Even when the wig base is constructed with a non-woven nylon net member as disclosed in 3,905,378, the present invention can be applied significantly when welding filament inter-contacts.

Further, it goes without saying that the present invention is not limited to a wig base composed only of nets, and can be applied to a wig base having at least a part of the nets. It is preferable that the filaments are colored in the color of the scalp, because they are more inconspicuous in combination with the matting effect.

〔The invention's effect〕

As described above, according to the present invention, in the ultrasonic welding apparatus for a wig base net, the work surface on which the net die to be welded is placed has a surface roughness of R _Z = 15 to 120 μm, preferably 80 μm. Since the ultrasonic welding device is configured by finishing the rough surface so that the work surface of the ultrasonic welding device is preferably formed into a rough surface by blasting, the wig base net is When ultrasonically welding the intersections of filaments, when the outer surface of each filament of the net is once melted by ultrasonic welding, it takes a shape with surface roughness according to the blasted work surface and solidifies in this state Therefore, the ultrasonically welded portion of the outer surface of the filament of the wig base net does not receive and reflect light, and therefore a sufficient matting effect is achieved. As known to facilitate the use of the wig to a third party for eliminating. Furthermore, if the work surface is formed on the surface of the work plate that is separate from the ultrasonic welding device main body, even if the surface roughness due to blasting of the work surface is abraded due to repeated ultrasonic welding work, All you have to do is replace the plates. Further, when the work plate is made of a stainless plate, the surface roughness of the work surface is less likely to be worn, and replacement due to the wear is small, which is economical.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of an ultrasonic welding apparatus according to the present invention, FIG. 2 is an explanatory view of a general wig base manufacturing method, and FIG. 3 is an ultrasonic wave of a conventional wig base net. It is a schematic side view which shows a welding device. 10 ... Ultrasonic welding device; 11 ... Main body; 12 ... Work table; 13 ...
… Work plate; N …… Net for wig base.

Claims (5)

[Claims] 1. An ultrasonic welding device for a wig base net, wherein the work surface on which the net die to be welded is placed has a surface roughness (JIS B0601) of R _Z = 15 to 120 μm.
An ultrasonic welding device, characterized in that it is formed in a fine uneven shape. 2. The ultrasonic welding apparatus according to claim 1, wherein the work surface is formed into a fine concavo-convex shape by blasting. 3. The ultrasonic wave according to claim 1, wherein the working surface is formed in a fine uneven shape so as to have a surface roughness of R _Z = 80 μm. Welding equipment. 4. The work surface having the fine concavo-convex shape is formed on the surface of a work plate that is replaceably attached to the ultrasonic welding apparatus main body. Thru | or the ultrasonic welding apparatus in any one of 3rd term. 5. The ultrasonic welding device according to claim 4, wherein the work plate is made of a stainless plate.