JP3193011B2 - Method of forming head for elastic doll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming an elastic doll head.

[0002]

2. Description of the Related Art Heretofore, a doll head having elasticity is generally formed by melting vinyl chloride and forming it by a slash molding method or a rotational molding method. Both of the above methods have an advantage that the finishing is good because a parting line such as blow molding is not formed. In addition, the latter method has an advantage that it can be mass-produced at low cost.

[0003] By the way, vinyl chloride contains chlorine, and in the above-mentioned molding method, a phthalate ester must be added as a plasticizer to vinyl chloride in order to impart elasticity to the molded article. Recently, the safety of both vinyl chloride and phthalic acid ester has been questioned, and recently there has been a tendency to avoid the use of vinyl chloride in various fields. There is a pressing need to mold with molding materials.

[0004]

However, even if slush molding or rotational molding is performed using a molding material other than vinyl chloride, molding is impossible because the material does not gel. Although the molding itself is possible by blow molding, in this molding method, the parting line appears on the face of the face, and the molding material hardly wraps around a part far from the parting line. As a result, the thickness of the entire body becomes uneven, and the eyes, nose, mouth, etc., which have many irregularities, are thinner than other parts, causing problems such as being transparent and easily denting and being easily damaged. .
Regarding the head for a doll, in addition to the finish of the surface of the face, that is, the smoothness of the surface and the fineness of the unevenness of each part of the face, it is also important that the overall thickness is uniform. Had a fatal problem.

Further, the head for a doll must have elasticity with a soft feeling similar to human skin, and this requirement must be satisfied.

An object of the present invention is to solve the above-mentioned problems and to provide a method of molding a head for a doll using a molding material other than vinyl chloride and having a particularly uniform thickness and elasticity by blow molding. And

[0007]

In order to solve the above-mentioned problems, a method of forming a doll head according to the present invention has the following requirements. (A) Using a split mold having an inner surface shape conforming to the shape of the head for a doll, and using a molding material mainly composed of a synthetic resin thermoplastic elastomer as a molding material. (B) Heating the molding material After dropping the parison between the split molds, close the split mold and blow air into the interior. (C) The parison is the part corresponding to the front and back of the doll head
Is an uneven thickness parison that is thicker than others

[0008] Further, when blowing air into the split mold, it is preferable to bleed the air in the cavity from at least one protruding portion such as a nose.

[0009] Similarly, the parting line by the split mold is preferably formed at an arbitrary position which does not impair the appearance.

Further, a silicone resin may be used instead of the thermoplastic elastomer.

A rod is provided at a position corresponding to the neck of the split mold so as to be able to protrude into and retract from the cavity. After the air is blown, the rod is protruded into the cavity, and the rod is opened before opening the split mold. It is preferable to be evacuated from.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral A denotes a mold for molding a doll head, and B denotes a blow molding machine. The molding die A is subjected to a blow molding method, and is composed of two divided dies 2, 3. An inner surface shape a conforming to the shape of the head of the doll is formed in one split mold 2, and an inner surface shape b conforming to the shape of the face portion is formed in the other split mold 2. The mating surface 4 is formed so as to be at or near the hairline of the doll head.

As will be described in detail with reference to FIG. 2, the split dies 2 and 3 each have a nose 5, a jaw 6, an ear 7, and a projection 8 constituting a head 8 for venting air. An air vent hole 9 is formed. The diameter of the air vent hole 9 is 0.1 mm to 0.3 mm
It is preferable to form it. The nose 5, the jaw 6, and the air vent 9 of the head 8 are formed so as to be perpendicular to the mating surface 4 of the split mold 2. Further, the air vent hole 9 of the ear part 7 is formed so as to be perpendicular to a plane (not shown) serving as the center of the front. An air blowing hole 10 is formed in the uppermost mating surface 4 of the head 8.

Although the air is extracted at the protruding portion, it is sufficient that the air is extracted at one or more locations. Usually, it is preferable to provide them on the nose 5 and the ears 7, especially on the nose, but it is not limited to the embodiment. The projecting part is the nose 5,
It includes not only the parts protruding from the surface such as the jaw 6 and the ears 7, but also all the parts that are not dented, such as the lips, cheeks, and foreheads. Therefore, it also includes a portion, such as the portion of the air vent hole 9 of the head portion 8 and the jaw portion 6, which is far from the joint of the split molds 2 and 3 and in which air tends to remain.

The one split mold 2 has a neck 1
A cylindrical through-hole 12 is formed at a portion corresponding to 1, and a rod 13 is arranged in this through-hole 12 so as to slide and protrude into and out of the cavity. A ring-shaped groove 14 is formed on the peripheral surface on the distal end side of the rod 13. Rod 13
May be configured to be operated by an air cylinder device, a hydraulic cylinder device, or the like (not shown) installed outside the mold.

Next, as shown in FIG. 1, the blow molding machine B converts the molten molding material into a tubular parison 15 by an extruder 20 and extrudes it into the molding die A. The parison 15 is configured to be extruded as an uneven parison. In this example,
The part corresponding to the front and back of the doll head is made thicker than the others .
You .

That is, the blow molding machine B has an outer die 21, an inner nozzle 23 held by a spider 22, and an air blowing pipe 24 passing through the center of the nozzle 23.
Are provided. Then, the die 21 and the nozzle 23
, The parison 15 is pushed out, and air is blown out from the central tube 24. The thickness of the parison 15 is determined by the die 21 and the nozzle 23. Therefore, as shown in FIG. 3 (a), the uneven thickness parison 15 is formed by an uneven diameter die 21, that is, a die 2 having an approximately elliptical inner surface.
1 obtained. Similarly, it can be obtained by making the outer surface of the nozzle 23 substantially elliptical. Further, the thickness can be adjusted by moving the nozzle 23 up and down to change the widths p and q of the passage of the molding material as shown in FIG. In addition, by adjusting not only the thickness in the front, rear, left and right, but also the thickness in the upper and lower directions, an optimal parison for molding can be obtained.

In the case of making a doll with a thickness of about 4 cm and a width of about 3 cm, the left and right dimensions of the parison are 13.5 mm to 14.5 mm, and the front and rear dimensions are 15 mm.
About 16 mm, the thickness in the left-right direction is about 4 mm, and the thickness in the front-rear direction is about 1
A rough standard is to increase by about 0 to 30% (preferably about 20%), and this may be appropriately increased or decreased.

Next, a method of manufacturing a doll head will be described.

First, the molding material is made of a thermoplastic elastomer of a synthetic resin as a main component because the doll head as a molded product needs to have the same soft elasticity as human skin. A material obtained by adding a plasticizer, a coloring agent, and the like to this is used. Such thermoplastic elastomers include olefin-based elastomers, styrene-based elastomers, styrene-butadiene-based elastomers, urethane-based elastomers, polyester-based elastomers, polyethylene-based elastomers, and the like. Although such a thermoplastic elastomer does not become a gel like vinyl chloride even when a plasticizer is added, it can be used as a molding material for blow molding. The range of choice of plasticizer is also large. Therefore, no chlorine-based elastomer is used. In this example, Septon (trade name) manufactured by Kuraray Co., Ltd. was used. Also, no phthalate is used as a plasticizer. As the molding material, a silicone resin may be used in addition to the elastomer.

The above molding material is heated, and a cylindrical parison 15 is dropped between two divided molds 2 and 3 which are spaced apart from each other as shown in FIGS. Type 2, 3
Is closed and air is blown from the blowing pipe 24.

The heating temperature of the molding material is 210 ° C. to 220 ° C.
° C, and the air pressure is 4 kg / cm ^{2 to} 6 kg / cm ² . By blowing air, the parison 15 expands and sticks to the inner surface of the mold. The temperature of the molding material is from 210 ° C. to 220 ° C.
Since the temperature is set to ° C, the parison 15 expands uniformly. By the way, a part of the air originally existing in the cavity remains between the parison 15 and the inner surface of the mold. Therefore, the residual air is removed from the air vent 9 almost simultaneously with the air blowing. As a result, a kind of wall is not formed by the residual air, and the molding material is in close contact with the entire inner surface of the mold A.

The parison 15 dropped into the split mold is an uneven thickness parison, and the thick part of the parison 15 is supplied to the part before and after the parting line away from the parting line. A sufficient amount of molding material spreads over the parts constituting the nose, jaw, mouth, occipital region, etc. corresponding to the front and back. Therefore, only the flesh of the protruding portion does not become thin.

Next, after air is blown into the mold A,
As shown in FIG. 6, the rod 13 is protruded into the cavity, and the rod 13 is retracted from the molding die A before opening the divided dies 2 and 3. By the protrusion of the rod 13, the molding material is extruded into the split mold 2, and a neck hole is formed. When the rod 13 is pulled out, a ridge ring 16 is formed on the peripheral surface of the neck hole.

When the split mold 2 is opened after the rod 13 is retracted, the molded product falls off the two split molds 2 and falls.
Doll head 1 having elasticity as shown in FIGS. 7 (a) and 7 (b)
7 is taken out. The parting line 18 appears along the hairline.

According to the above-mentioned method of forming a head for a doll, one of the split molds 2 has an inner surface shape corresponding to the shape of the head of the doll, and the other split mold 2 has an inner shape corresponding to the shape of the face. Since the inner shape is formed as described above, a parting line does not appear on the most important face portion of the doll head 17.

The parting line 18 is formed in the vicinity of the hairline of the head, but the head of the doll head is covered with hair by flocking or wigs. It is not exposed to visible parts. Therefore, the parting line 18 does not need to be post-processed and can be ignored.

Next, at the same time when air is blown in at the time of molding, air is evacuated from air bleed holes 9 formed in portions corresponding to the nose 5, the jaw 6, the ear 7 and the head 8, so that these portions are blown. The molding material is also supplied well. Therefore, a sharp shape faithful to the shape of the mold can be obtained at the tip of the nose, the nostril or the ear shell. Moreover, the diameter of the air vent hole 9 for venting air is very small, 0.1 mm to 0.3 mm, and the molding material cannot enter the air vent hole 9.
Useless parts such as whiskers do not occur in the molded product.
Therefore, there is no need for a post-processing operation for trimming and removing minute wasteful portions. The height is 40mm and the width is 30mm
In the case of a doll of about the size, the diameter of the air vent hole 9 is 0.2
It turned out that about mm is most preferable. If the size is 0.3 mm or more, the post-processing operation is easy, and therefore, when forming a doll head having a large size, trimming may be performed.

Since the air vent hole 9 is formed perpendicular to the mating surface 4 of the split molds 2, 3, the air extracting efficiency is high. However, this is not a limitation of the present invention.

After the parison 15 expands by blowing air during molding, the rod 13 is inserted into the cylindrical hole of the split mold 2.
The neck hole is formed by exposing and retracting, so that the neck hole does not impair the molding of other parts. On the other hand, if the rod 13 is formed with the rod 13 protruding into the mold from the beginning, the rod 13 may hinder the wraparound of the molding material, and the molding material may not be sufficiently supplied to the jaws and the like.

Since a ring-shaped groove 14 is formed on the peripheral surface on the distal end side of the rod 13, the molded doll head 1 is formed.
An annular ridge 16 is formed on the peripheral surface of the neck hole 7. Therefore, it is effective as a stopper when the neck portion 11 is fitted into the neck hole on the body side. The ring-shaped groove 14 includes the spiral groove 14.

As a method for removing the residual air from the cavity, instead of forming minute air vent holes 9 in the split molds 2 and 3, as shown in FIG.
(3) The porous body 21 may be penetrated, and the shape of the nose 5 and the ear 7 may be formed on the cavity-side end surface of the body 21. The pore diameter is preferably set to 0.03 mm to 0.1 mm.

According to the above configuration, the air in the cavity that is extruded by the expansion of the parison 15 due to the blowing of air during molding is naturally exhausted to the outside from the porous body 21. It is possible to obtain a molded product having a shape faithful to the mold and having sufficient elasticity without making it. In this case, the porous body 2
The air in the cavity may be forcibly evacuated from 1.

[0034]

According to the present invention, the parison fed into the split mold corresponds to the front and rear of the doll head.
Because the parison is an uneven thickness parison that is thicker than the other parts, a sufficient amount of molding material spreads over a part far from the parting line, which tends to be thin with a normal parison. Therefore, the thickness of the formed doll head can be made relatively uniform, and there is no unnaturalness that only part of the doll head is easily dented when the surface is touched with a finger or the like. In addition, the merchantability of the doll head is not impaired.

Further, since an elastomer is used as a molding material and vinyl chloride is not used, there is no fear of polluting the environment, and a doll head which is harmless to health and harmless can be manufactured. A doll head having the same soft feel and elasticity as the skin of the doll can be formed. Therefore, it is possible to provide a doll that is most suitable as a tool for providing a simulated experience in the play of infants and children.

In addition, since the molded article is an elastic body, it can be smoothly removed from the mold, and there is no problem such as breakage of the undercut such as the nose and the jaw.

According to the second aspect of the present invention, the parison is formed by a non-uniform die,
An uneven thickness parison can be obtained easily and at low cost.

According to the third aspect of the present invention, when air is blown into the split mold, the air in the cavity is extracted from at least one of the projecting portions such as the nose to form the mold. Since a faithful and sharp shape is obtained, the head for an elastic doll with excellent design and good appearance can be obtained in combination with the effect that the thickness is relatively uniform due to the uneven thickness parison.

According to the fourth aspect of the present invention, since the parting line by the split mold is formed at an arbitrary position which does not impair the appearance, the commercial value as a doll head can be obtained by blow molding. Is not impaired.

According to the fifth aspect of the present invention, the first aspect is also provided.
The same effect as that of the invention according to the above is obtained.

According to the invention of claim 6, since the parison expands by blowing air at the time of molding, the neck hole is formed by making the rod protrude and retract into the cylindrical hole of the split mold. The neck hole does not impair the molding of other parts.

[Brief description of the drawings]

FIG. 1 is a schematic view of a molding apparatus provided for a method for molding an elastic doll head according to the present invention.

FIG. 2 is a cross-sectional view of a molding die for the doll head.

FIG. 3 (a) is a cross-sectional view of an outlet portion of a parison by using an uneven diameter die.

FIG. 4 is a sectional view of a state where a parison is dropped into a molding die.

FIG. 5 is a sectional view of a state in which air is blown into a molding die.

FIG. 6 is a sectional view showing a state in which a neck hole is formed.

7 (a) and 7 (b) are front and side views of a molded doll head.

FIG. 8 is a cross-sectional view of a mold used for another molding method.

FIG. 9 is a longitudinal sectional view of a head for a doll when ordinary blow molding is performed.

[Explanation of symbols]

 2, 3 split mold 5 nose 9 air vent 13 rod 17 doll head 18 parting line 21 porous body

────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ identification code FI // B29K 21:00 B29L 31:52 (58) Field surveyed (Int.Cl. ⁷ , DB name) A63H 1/00-37 / 00 B29C 49/04 B29C 49/48

Claims (6)

(57) [Claims] 1. A method of forming a head for an elastic doll, characterized by the following requirements. (A) Using a split mold having an inner surface shape conforming to the shape of the head for a doll, and using a molding material mainly composed of a synthetic resin thermoplastic elastomer as a molding material. (B) Heating the molding material After dropping the parison between the split molds, close the split mold and blow air into the interior. (C) The parison is the part corresponding to the front and back of the doll head
Is an uneven thickness parison that is thicker than others 2. The method according to claim 1, wherein the parison is formed by a non-uniform die. 3. When blowing air into the split mold,
2. The method for forming a head for an elastic doll according to claim 1, wherein air in the cavity is evacuated from at least one protruding portion such as a nose. 4. The parting line formed by the split mold is formed at an arbitrary position that does not impair the appearance.
A method for forming a head for an elastic doll according to the above. Wherein instead of the thermoplastic elastomer, the molding method of the elastic body doll head according to claim 1, wherein the silicon resin. 6. A rod is provided at a portion corresponding to the neck of the split mold so as to be able to protrude and retract into the cavity. After the air is blown, the rod is protruded into the cavity and the rod is opened before opening the split mold. The method for forming a head for an elastic doll according to claim 1, wherein the head is retracted from the head.