JPS59118186A - Production of head for doll and neck hole molding pin used therein - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a doll's head and a pin for forming a neck hole used in the manufacturing method, and more particularly, to a manufacturing method for manufacturing a doll's head by a synthetic resin rotation molding method. It is.

Generally, a doll's head is made by roti-john molding a soft synthetic resin, and an engagement hole is formed in the neck of the doll, and this engagement hole is engaged with an engagement protrusion provided in the neck of the body by injection molding. are connected together. FIG. 1(a) shows an example of this, in which a part of the engagement protrusion 21 of the body part 20 engages with the lower engagement hole 23 of the doll's head body 22, and at this time, the engagement protrusion The portion 21 passes through the engagement hole 23. However, when roti-sion molding the head body 22, a four part 25 is formed at the tip of the neck hole molding pin 24 so that the resin is also applied to the inner end opening of the engagement hole 23. , neck hole molding pin 2 attached to the head molding mold 27
4, the resin surrounding the tip recess 25 is made defective to make the tip periphery 28 thinner, and when the neck hole forming pin 24 is removed at the end of molding, the unnecessary resin 28 that is wrapped around the tip recess 25 is removed at the same time. A method is adopted in which the neck hole forming pin 24 is removed from the thin wall portion of the distal end peripheral portion 2B to open the engagement hole 23. However, even with this method, about 33% of the unnecessary resin 28 that blocks the engagement hole 23 remains in the head body 22 without being separated when the neck hole forming pin 24 is removed. Therefore, as post-processing after molding, it is necessary to perform two days of cutting off the unnecessary resin for heads that are about 1/3 of the production quantity. Moreover, when the non-separation rate of the unnecessary resin 28 is high, it is necessary to exhaust the gas generated inside the head body 22. Therefore, a gas vent hole is formed at the top of the head body 22 to facilitate degassing. However, in the case of rotary john molding, the inner periphery of the gas vent hole 29 becomes thicker, and as hair is implanted into the head body 22 using a sewing machine or the like, the gas vent hole 28 and The inner thick part 30 becomes a nuisance to the hair transplanting operation, and must be avoided during the hair transplantation process, which has the disadvantage of making the work complicated and troublesome.

The present invention solves the above-mentioned drawbacks, and in particular, separates the engagement hole blocking part of the head body with extremely high efficiency, eliminates post-processing after molding and degassing holes, and facilitates the flocking work to improve production efficiency and flocking. The purpose of this invention is to propose a method for manufacturing doll heads that can improve work efficiency.

Embodiments of the present invention will be described below with reference to the drawings.

First, 1 is a mold for forming a doll's head body. The mold 1
A concave surface 3 corresponding to the outer shape of the doll's head body 2 to be obtained is formed inside, and a fitting hole 5 for a neck hole forming pin 4 is provided in the lower part. This neck hole forming pin 4, like the conventional one, has an annular ring 7 on the side circumferential surface of the approximately central portion of the cylindrical pin body 6.

A recess 10 is formed at the tip, and in addition, an annular obstacle protrusion 8 is provided around the tip, and as will be described later, this obstacle protrusion 8 is made of synthetic resin, which is the molding material. It becomes an obstacle around the resin of the material.

Therefore, a method for manufacturing a doll head using the neck molding pin 4 will be described.

First, a necessary amount of a sol-like soft synthetic resin material 12 such as soft vinyl chloride is placed in a mold 1 for a doll head body 2 as a molding material.
(hereinafter simply referred to as sol-like resin material 12) is injected, and a neck hole forming pin is inserted into the lower part of the mold 1 and fixed.

As a result, the neck hole molding pin 4 protrudes toward the center of the head body 2 molding die 1, and its outer surface is configured as a toy 1 receiving surface of the molding material.

Next, according to the 1θ method, rotation molding is performed while rotating the molding die 1 under heating. Due to the centrifugal force acting during rotation, the sol-like resin material 12 inside the mold 1 flows along the inner surface of the mold 1, forming the eyes, mouth, nose, head, etc. Similarly, the sol-like resin material 12 also spreads over the outer surface of the neck hole forming pin. At this time, the sol-like resin material 12
gradually rotates from the base of the pin body 6 to the tip.

That is, in the above-mentioned rotational molding, the sol-like resin material 12 in the mold 1 is made to flow by centrifugal force when the head mold 1 is rotated. For the inner surface of the mold 1 and the surfaces formed radially from the center of the mold 1, rotation conditions are set so that the centrifugal force during rotation is large. The sol-like resin material circulates well in areas where the centrifugal force is large. On the other hand, conversely, the sol-like resin material 12 is difficult to spread around areas where centrifugal force does not act or where the centrifugal force is small.

Looking at this with respect to the head molding die 1 and neck hole molding pin, the centrifugal force based on the rotation of the molding die 1 acts strongly on the four internal surfaces 3 of the head body molding die 1, so the sol The shaped resin material 12 heals on all four internal surfaces 3 and spreads outward.

Similarly, since the pin body 6 of the -+'<r hole number type pin is provided in the radial direction from the center of the mold 1, the acting force of the rotational centrifugal force of the head mold 1 is By,
The sol-like resin material 12 advances along the outer surface of the neck hole forming pin 4 from the base toward the tip, and is attached to the outer surface of the neck hole forming pin 4. At this time, the sol-like resin material 12 first enters into the annular groove 7 formed approximately in the center from the peripheral surface of the base of the pin body 6, fills the groove, and further advances toward the tip side of the pin body 6. However, an obstacle protrusion 8 is provided in front of the tip, and the sol-like resin material 12 must climb over the obstacle protrusion 8 described in "6" before reaching the tip. is formed to protrude outward from the pin body 6, so the sol-like resin material 12 is difficult to cross over it. This is because the inner and outer wall surfaces 8a, 8b of the obstacle protrusion 8 extend outwardly from the outer surface of the pin body 6. This is because the inner and outer wall surfaces 8a and 8b are not formed on the inner surface of the mold 1, nor are they formed in a radial direction from the center of the mold 1. Therefore, the centrifugal force accompanying the rotation of the molding die 1 is difficult to apply to the obstructing protrusion 8, especially the inner and outer wall surfaces 8a and 8b, and the sol-like resin material 12 is difficult to spread around. For this reason, the debris surrounding the sol-like resin material 12 is blocked by the obstacle protrusion 8 in item 6, and as a result, the sol-like resin material 12 is not able to properly wrap around the tip of the neck hole forming pin 4. The wall thickness of the sol-like resin material 12 near the tip of the neck hole forming pin 4 is extremely thin, especially since the tip peripheral edge 9 is formed into a sharp point. The sol-like resin material finally accumulates on the tip recess 10 (the sol-like resin material in this state is indicated by 13).

The progress of the sol-like resin material 12 with respect to the neck hole-forming pin 4 will be explained with reference to FIG. 4. In the first stage of molding, as shown by the line 4 only near the base of + At this time, as mentioned above, the resin surroundings are not good, so the wall thickness becomes thin.Similarly, the sol-like resin material 12 is applied to the inner wall surface 8a of the obstacle protrusion 8 as shown by the line S. Along the pin body 6
Even when going to the side, the resin area is not good. therefore,
The sol-like resin material 12 is extremely thin fm, and eventually accumulates in the tip recess 10 of the neck hole forming pin 4 as shown by the line t, but at this time, the tip peripheral edge 9 of the forming pin 4 is Since it is formed at the tip, the sol-like resin material hardly adheres to the peripheral edge 9, and therefore the tip peripheral edge 9 becomes even thinner.

Next, after the low region molding is completed, the neck hole molding pin 4 is removed from the mold 1. As a result, the doll head body 2 is molded by the resin material 12 layered in the mold 1, and the neck hole and the engagement hole 23 are formed by the resin material 12 layered on the outer surface of the neck hole molding pin 4. Molded.

By the way, the thick portion of the resin material 12 layered on the outer surface of the neck hole molding pin 4, that is, the portion layered on the circumferential surface of the pin body 6, remains inside the doll head body 2. On the other hand, since the wall thickness of the tip peripheral portion 9 of the neck hole forming pin 4 is extremely thin, the sol-like resin material 1 on the tip concave portion 10
3 is easily separated from the ultra-thin wall portion and removed from the doll head body 2 together with the neck hole forming pin 4 when the pin is removed. Therefore, the neck hole obtained by the above-mentioned molding is formed through the neck hole without being closed. Moreover, according to the numerical method, the removal rate of the unnecessary resin material 13 attached to the tip of the neck hole forming pin 4 is actually more than 85%, and the unnecessary resin material 13 is completely removed. 13 can be removed. Therefore, unlike the conventional method, post-processing for removing the blocked portion of the neck hole is almost unnecessary. Further, since there is no need to carry out a degassing process to remove the residual gas, a degassing hole at the top of the head body 2 is not required. Therefore, the 4171 hair on the head becomes easier, work efficiency is significantly improved, and the appearance is also excellent.

Note that the shape of the obstruction protrusion '8 provided on the neck hole forming pin 4 is not necessarily limited to that shown in the above figure. For example, as shown in FIG. 5(a), the obstacle protrusions 8 are formed on the circumferential surface of the pin body 6 at regular intervals, and as shown in FIG. 5(b), the obstacle protrusions 8 are formed on the pin body 6. A plurality of obstacles are provided on the circumferential surface, the inner and outer wall surfaces 8a and 8b of the obstacle protrusion 8 have different widths as shown in FIG.
), the plurality of obstacle protrusions 8 may be formed diagonally, respectively. In addition, the inner shape of the neck hole can be appropriately set according to the manner of connection with the doll's body, and the shape of the neck hole molding pin 4 can be set according to this manner of connection. If the two neck holes in the head body are to be of a screw-in type rather than a press-fit type as shown in the example shown above, a thread groove 14 must be formed in the neck hole forming pin 4 as shown in FIG. Bye.

As described in detail above, according to the molding method according to the present invention, an obstructive protrusion is formed near the tip of the neck hole molding pin, which is difficult to be affected by the centrifugal force in rotion molding. The sol-like resin material for molding is obstructed by the above-mentioned obstacle protrusion and the resin surrounding it becomes poor, so the thickness of the resin at the edge of the tip of the neck hole molding pin becomes extremely thin.
Therefore, after the molding is completed, when the neck hole molding pin is removed, the resin layer layered at the tip of the neck hole molding pin does not remain in the head body and can be easily transferred to other neck hole molding pins together with the neck hole molding pin. It is separated from the thick part and removed outside the head body. As a result, there is no need for post-processing to remove unnecessary residual resin meat or vent holes for residual gas in the head body, so it is possible to significantly improve the productivity of the head body itself, as well as for hair transplantation work. In conjunction with this, efficiency can be significantly improved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the state in which the head and body of the doll are connected, and Figs. 2 (a), (b) and (c) respectively show the molding die 1 in the conventional doll head molding method. The overall view, the perspective view of the neck hole molding pin, the enlarged view of the part P, and FIGS. 3(a), (b), and (C) are respectively the molding die 1 in the method for molding a doll's head body according to the present invention. , a perspective view of the neck hole molding pin and an enlarged view of part Q, FIG. 4 is an enlarged view showing how the sol-like resin material adheres to the neck hole molding pin during the above molding, and FIG. ), (b), (C)
, (d) and (e) are side views showing other examples of the obstruction protrusion of the neck hole forming pin according to the present invention, respectively.
The figure is a partial perspective view of another example of the neck hole. Code l...Molding mold 2...Doll head body 3.
...Concave surface 4...Neck hole molding pin 5...Fitting hole 6...Pin body 8...Obstruction protrusion 9...
Tip periphery lO...Tip recess 12.13...
Sol Resin Materials' J Temple Yoshisoku Tadakyo Hitachi Co., Ltd.
Kara representative patent attorney Se
Mikio Kawa = 48 ( 1st ViJ Figure 4q Figure 5 (a) (b) (c) Figure 6

Claims (2)

[Claims] (1) After injecting the required amount of sol-like synthetic resin material into the mold for the doll's head body from which the neck hole molding pin protrudes,
In the method for manufacturing a doll's head body, the method for manufacturing a doll's head body comprises rotating the molding die and causing the sol-like synthetic resin material to flow into the molding die to mold the doll's head body. A doll characterized in that near the tip of the pin, the sol-like synthetic resin material is caused to flow in a direction where the action of centrifugal force accompanying the rotation of the molding die is not applied or the action is very small. Method for manufacturing a head body. (2) The required amount of sol-like synthetic resin material is injected into the mold and is then rotated in the mold to protrude toward the center of the mold. A neck hole forming pin used in a method for manufacturing a doll's head body, characterized in that an obstructing protrusion projecting outward is provided near the tip.