JPS61169217A - Manufacture of synthetic resin doll member - Google Patents

Abstract

PURPOSE:To uniformly manufacture a synthetic resin doll member with high productivity by a method wherein resin is injection-molded to a core member consisting of composite of metal and synthetic resin. CONSTITUTION:A cavity S for molding the leg member of a doll is formed respectively on a pair of injection-molded halves 20 and 21. At the same time, an insertion hole 22 is formed at the upper end of the cavity S on the mold half 20. In addition, a pinching part 23 is formed at the lower end of the cavity S in the mating mold surfaces of both the mold halves 20 and 21. Firstly, a core material 1 is set in the molding cavity S of the mold halves 20. and 21. Secondly, molten vinyl chloride resin with a temperature of 170-180 deg.C is injected in the mold halves 20 and 21 by conventional procedure. In this case, because both the gaps are held through the contact of the tips of gap holding projections 16 with the inner wall 20a of the mold half, no shifting of the core member due to the fluid pressure of resin applied to an aggregate 3 occurs. Finally, after the completion of molding, a doll member is removed from the mold halves 20 and 21 and a gate is cut off and mold flashes are removed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a method for manufacturing doll members made of synthetic resin.

(Prior art and its problems) In general, dolls for the purpose of emotional and intellectual education during the growth process of men and women are composed of several parts such as a head, arms, legs, and a torso. The materials are made of vinyl chloride resin, and each one is manufactured using a different manufacturing method depending on its purpose.For example, one head is made by roti-john molding, the body is made by injection molding, and the arms and legs are made by slush molding. Manufactured.

However, in either case, if the synthetic resin is used alone, the molded member will be difficult to bend due to the hardness and softness of the material, or will quickly return to its original shape even after one bend. For this reason, the bending of joints such as the 81st part and the stop part becomes unnatural, lacking in realism, and the doll's body parts bend and stretch just like humans do.
A basic operating function that maintains its bent state is desired.

As a solution to this problem, it was proposed to embed a core metal in the doll part to suppress the restoring force of the resin part and maintain the bent state of the molded object. executed by. This process involves injecting molten resin sol into the mold, releasing the bubbles in the vine, and then drying it before discharging the uncured vinyl resin sol from inside the mold before inserting the steel core into the mold. The core metal is embedded in the molded body by inserting the core metal into the molded body and carrying out thorough firing, and through a cooling and removal process, a doll member with the core material embedded is manufactured. However, this molding method had the following drawbacks.

(1) In the slush molding method, the molded product is hollow, so the position of the core metal is likely to shift, making it difficult to hold the core metal in the center of the molded product.This avoids the tendency for bending and stretching to deviate from the center. Kotoka deena 17λ.

(2) When a hollow molded body is bent, the bent portion deforms unnaturally.

(3) In the above molding method, the molded body is removed from the mold by being sandwiched between two tools and forcibly pulled out, so the dimensions are all different. For this reason, members that form pairs, such as arms and legs, must be sorted into similar groups, which is a cumbersome task.

(4) Productivity is low because the number of molding Ts is large and the molding time takes about 270 seconds.

For this reason, it has been considered to produce a molded body containing a cored metal by injection molding, but carrying out this molding method has the following technical difficulties.

(1) It is technically difficult to hold the core metal at the center of the mold. In other words, in the injection molding method, considerable resin flow pressure is generated when molten resin is injected into the mold, but in order to firmly hold the core in the same position against this resin flow pressure, the mold The problem is how and by what means to fix the core metal inside. If you try to hold this with a pin etc., it is technically possible, but
Since the hole for the bottle remains in the doll member after molding, the commercial value is lost.

(2) Even if the core metal can be retained, post-processing is required to remove the core metal so that it does not protrude from the doll member, but in order to safely remove this, it is necessary to simply remove the core metal from the doll. It is not enough to simply remove the parts that protrude from the member. This is because during use, the buried portion may break naturally or internally and protrude. Since product safety is an important issue related to the life of a company, it is an extremely difficult problem to configure a means to carry out this process efficiently and reliably.

(3) Vinyl chloride resin has a high heat shrinkage rate, so r&
Dimensional shrinkage (5 to 20%) occurs after shaping, and the dimensions of the molded part vary. Furthermore, since the metal core metal has a small shrinkage rate, there is a possibility that the metal core protrudes from the molded member after molding.

How to solve this problem is also an important issue.

Due to the many technical difficulties described above, molding of cored members by injection molding was conventionally abandoned.

(Object of the invention) The present invention solves the above problems, and uses a core material made of a composite material of metal and synthetic resin, and uses an injection molding method to create a safe,
The purpose of the present invention is to propose a manufacturing method for manufacturing synthetic vA resin special doll members with uniform dimensions and high productivity.

(Structure of the Invention) In order to achieve the above object, the method for manufacturing a synthetic resin doll member according to the present invention is such that one end is bent, a break-off groove is formed near the 11*; The other end of the metal core with a meandering middle part is connected to the base of a synthetic resin aggregate with a spacing protrusion protruding outward and a break-off part formed at the tip to form the core. The core material is formed into the following 1-
It is characterized by holding the inside of the molding space for A4-shaped raw metal from one culm and performing molding.

(a) 1. , Insert and hold the ends of the P and N bends of the core metal into the insertion holes formed in 11t of the two-legged mold, and place the ends of the aggregate on the two-legged mold 11. The core material is held and fixed at the center of the molding space in the mold by holding it in between.

(b) lr, a step of injecting and molding molten vinyl indium resin into the numerical space;

(c) After taking out the molded doll member from the mold, a step of breaking off and removing the end portion of the bone structure protruding from the doll member and the first corner portion of the core metal from the break-off groove.

(Operations and Effects of the Invention) As described above, according to the present invention, first, the core material is made into a composite structure of a metal core bar and synthetic resin aggregate, and in order to set it in a mold, one end is The work is extremely easy, as it is only necessary to insert it into the insertion hole of one mold and hold the other end between the joints of the mold. In addition, the η material t is formed with an IFF distance-maintaining protrusion, which maintains the same distance between the inner wall of the mold and the bone A, so that the center of the core material 41! In addition, since a meandering part is provided in the middle of the core metal, when the melted PVC resin is injected into the mold, the intermediate meandering part of the core metal prevents the resin from flowing. Since the core material absorbs and relieves the pressure, it is held at the center position in the mold against the pressure of the resin flow.Therefore, it is possible to mold a doll member that can be bent naturally without being deviated from the center.

Next, the insertion end of the core metal protrudes from one end of the doll member taken out from the mold, and the clamping end of the aggregate protrudes from the other end, but these ends of the core metal and aggregate protrude. It can be easily broken off using nippers or the like from the 111 portion for removal. Therefore, the safety of the final product is 100 parts satisfied.

Furthermore, regarding shrinkage of the molded part after molding, since the core material is a composite structure material of core metal and aggregate, there are many uneven parts.
This uneven portion becomes an obstacle to shrinkage, and the shrinkage of the vinyl chloride resin portion is suppressed. Similarly, since a meandering portion is formed on the core metal, this portion hinders resin shrinkage for the same reason. Furthermore, since the synthetic resin aggregate occupies a high proportion of the molded member, the proportion of the resin portion is relatively low, and the degree of shrinkage thereof can also be suppressed to a low level. These act synergistically to suppress shrinkage of the vinyl chloride resin portion, making it possible to obtain a molded member with high dimensional accuracy.

Furthermore, injection molding has higher operational safety than slush molding and requires fewer steps, so overall productivity can be significantly improved.

(Example) Hereinafter, an example of manufacturing a leg member of a doll will be described with reference to the drawings.

First, the gist of this invention is to first construct the core material in a composite manner from a metal core bar and synthetic resin aggregate;
For molding doll parts.

After this composite core material is positioned and fixed at the center of the mold, molten synthetic 4154 resin is injected into the mold and injection molded, and the tip of the core material is post-treated after the drum.

Therefore, first, we will explain the structure of the core material.

Next, the molding mode of the leg members of the doll will be explained.

In the figure, reference numeral 1 indicates a core material, and this core material 1 is a composite material consisting of a metal core 2 and a synthetic resin aggregate 3, as shown in FIGS. In this example, the core metal 2 is preferably one with small spring hang, high mechanical strength, and good thermal conductivity, and in this example, it is made of a special aluminum alloy, one end of which is bent, and the bent part 4 is formed with a break-off groove 15a, a meandering portion 5 is formed approximately in the middle, and a hook-shaped bent portion 6 is formed at the other end.

11. Material 3 has a higher heat distortion temperature than vinyl chloride resin,
It is also preferable to use a material that has excellent mechanical strength, and in this example, one made by injection molding of polyacetal resin was used. The aggregate 3 is composed of a core metal holding part 7 and a core part 8. A core metal holding groove 9 is formed in the full image holding portion 7 and has a diagonal opening 11 on one side and on the other side. The holding Ll'
Protrusions 10 and 10 are provided facing each other on the opposing inner walls of the 1 m opening 9a on the i9 side, with an interval of 1 round or slightly smaller than the diameter of the core bar 2. Further, the inner walls are connected at the lower part by a connecting piece 12, and a receiving hole 13 is formed at the lower end of the holding groove 9 by the connecting piece 12 to receive the folded portion 6 of the core metal 2. The size of this receiving hole 13 is slightly larger than the diameter of the core metal 2. The side of the holding groove 9 opposite to the h-recording hole 13 is open. The core part 8 is formed into a plate shape, and reinforcing ribs 14, 14 are formed on both sides of the upper part, and a thin break-off groove part 15b is formed in the lower part. Further, on both opposing sides of the core metal holding portion 7 and the core portion 8, a pair of protrusion-like spacing protrusions 16.1 are provided outwardly.
6 is formed protrudingly. It is not necessary to provide these holding protrusions in pairs, and they should be oriented in the same direction (, Q,
No yellow. 1 Ml core material 1 from core metal 2 and finger material 3? / : When configuring it as shown in FIG. M9
Insert diagonally from a, roughly facing protrusion 10.10
When the core metal 2 is inserted into the holding groove 9 from between the two, the core bar 2 rotates around the part where the connecting piece 12 contacts, and the opposite protruding piece 1
This is because the spacing between O1l and O1itl widens depending on the adhesiveness of the aggregate 3.

The core metal 2 is held in the holding groove 9, and at the same time, the bent portion 6 at the lower end is fully inserted into the receiving hole 13 of the -i1 material 3. As a result, the support does not come out from the 11 part between the holding grooves 9, and the core metal 2 in the holding groove 9 receives resistance from the facing protrusion 1O110 at the side opening, so it cannot be easily removed. do not have. Therefore, the core metal 2 is well held within the holding groove 9 of the aggregate 3. Note that since the size of the receiving hole 13 is slightly larger than the diameter of the core metal 2, a clearance is created between the bent portion 6 of the core metal 2 and the receiving hole 13.

Next, a method of molding the leg members of a doll by injection molding using the core material having the structure described in - will be described.

First, as shown in Fig. 3, the injection mold 20.21
In addition to forming a molding space S for the leg members of the doll, an insertion hole 22 is formed in the upper end of the mold 20 of the plastic mold 20, and a hole 22 is formed in the lower end at the joint of the inner mold 20 and 21. Holding part 2
3 is formed.

Therefore, the core material 1 having the configuration described above is set in the molding space S of the mold 20.21. In this case, when fitting the molds 20 and 21, the tip 4a of the bent portion 4 of the core metal 2 is
The tip 8a of the core 8 of the aggregate 3 is inserted into the insertion hole 22 formed in the inner wall 20a of the aggregate 3 and held in the mold 20, 21.
It is held between the seam holding parts 23. In addition, insertion hole 2
2 is formed so that the core bar 2 can be better held by an auxiliary member 22δ. Thereby, the core material 1 is held and fixed at the center position of the forming χ interval S. The time required to set the core material 1 is about 5 seconds, and the work is very easy.

Then, according to the normal injection molding process" - compound mold 20.21
Inject molten vinyl chloride resin at 170° to 180 e'C(7)18. At this time, considerable resin wave pressure is applied to the core material 1 within the molding space S. However, since the core material 1 is held in the mold 20, 21 at its lower end, and the bent portion 4 at the end on the resin inflow side is held at right angles to the resin flow, it has sufficient resistance to the flow pressure. It is possible. Moreover, since the meandering portion 5 is formed on the core metal 2, this meandering portion 5 acts as a resistance to the resin flow pressure and relieves it, so that the resin wave pressure on other parts is alleviated.

In addition, against the resin flow pressure acting on the aggregate 3, the tips of the spacing protrusions 16.16 are in contact with the mold inner walls 20a, 21a, so that the distance between the aggregate 3 and the mold inner walls 20a, 21a is always maintained. hold well. Therefore, the position of the core material 1 hardly shifts due to the resin flow pressure.

2 on the mold inner walls 20a, 21a of the spacing protrusion 16.16.
Since the contact is at point 1'i, the molten resin also wraps around between the holding protrusion 16.16 and the mold inner wall 208°21a. Furthermore, since the molding temperature of f1443 is high, no deformation occurs due to the injection of molten resin. Furthermore, since the core metal 21 of the core material 1 is made of a special aluminum alloy with good thermal and Q properties, no temperature difference occurs between it and the surrounding molten resin.

As shown in [1], since the aggregate 3 has a high heat deformation temperature, it is not deformed at all by the injection of molten resin.

1-Injection molding The time required for the process is 50 to 60 seconds.

Next, after the molding is completed, the metal edges 20 and 21 are removed and the doll member is taken out. As a result, it is possible to obtain a doll leg member 25 in which the core material 1 is embedded. At that time, the leg member 25
The end 4a of the core metal 2 protrudes from the base side, and the tip 8a of the aggregate 3 protrudes from the end on the leg tip side. Therefore, along with the gate cant of the one leg member 25, the tip 4a of the core bar 2 and the aggregate tip t'B 8a are inserted into the break-off groove 1.
Break off from 5b. Core metal 2 has small springback! ll + special aluminium alloy, analysis LJ! lv Riwa Ji ;? ; is easy. The break-off groove 15a is located on the inside of the edge of the leg section 25a.
By laying it flat, the cut-off edge will not protrude from the outside. Similarly, i11% part 15 for break-off
b is provided inside the leg member 25, so the broken Ir! It is safe because the tip of the part does not protrude into the inside of the doll member 25 and outside.The process of taking out the molded member and processing the core material can be carried out in about 10 seconds.

By the way, after the molding S♀ is completed, the vinyl chloride resin in the leg member 25 contracts. However, in the part of the single leg S++ material 25 where the aggregate 3 is buried, the ratio of the aggregate 3 to the resin part is large, so the resin content decreases reciprocally and the degree of shrinkage increases. In addition, a straight wall is formed between the core holding part 7 and the core part 8 in the longitudinal direction of the leg member 25, and this wall prevents the shrinkage of the resin. Therefore, shrinkage of the resin in the longitudinal direction of this portion is minimized. In addition, in the part of the leg member 25 in which the core metal 2 is buried, a meandering part 5 that meanders in the longitudinal direction of the leg member 25 is formed approximately in the middle of the core metal 2. Suppresses resin shrinkage in the direction.

Therefore, the dimensional accuracy of the one leg member 25 is very high. In addition, since a clearance is formed between the tip bent portion 6 of the core metal 2 and the receiving hole 13 of the aggregate 3, distortion due to differences in thermal conductivity and thermal contraction rate due to molding heat during molding can be avoided. It is absorbed and there is no risk of cracking or the like occurring in the leg member 25.

Since the core metal 2 is embedded in the leg member 25 obtained in this way, by bending this, the core metal 2 of the core material l also bends, but the core metal 2 is held at the center of the leg member 25. Because of this, the direction of bending and returning will not be unnaturally biased. Since the core metal 2 is made of a special aluminum alloy with low springback, when the leg member 25 is bent, it
The bent state of the leg member 25 can be maintained by suppressing the restoring force due to the adhesive properties of the fat portion. Of the core material L, material 1 and material 3 do not bend, but since they are placed in the parts of the leg member 25 that do not require bending, no inconvenience occurs.Therefore, they have a bending performance that approximates human movement. A doll member is obtained.

In addition, the core material 1 uses a special aluminum alloy as the core metal 2,
Moreover, the bent part of the tip of the core bar 2 is pulled into the receiving hole 13 of the aggregate 3.
As a result of the 90 degree bending test at the -second stage, conventional steel cores were unusable after 10 to 15 cycles, but this example's Core metal 2 was confirmed to have a bending performance 10 to 12 times higher than that.

-1-'yn The effects of the molding method are summarized as follows:
It is as follows.

(1) Simplification of the molding process and improvement of productivity 1: Achieved.

Since molding can be performed by injection molding, the T number can be reduced to approximately one-third, and the molding time can be reduced to one-third to one-fourth, compared to conventional slush molding. In addition, the core material can be easily and reliably inserted into the mold during molding, and the injection molding method is safer than the slush molding method. Therefore, overall productivity has improved significantly.

(2) Ensuring the safety of molded parts.

Since the core material is constructed as a composite core material in which a metal core metal and a resin aggregate are connected, the core metal and the aggregate protrude from the doll member. However, the core metal is housed within the doll's body and is not exposed to the outside, and its protruding end is broken off and removed. Also, the protruding ends of the aggregate are also broken off from inside the molded part, so that the molded part is completely safe.

(3) Improving the performance and dimensional accuracy of molded parts” 2.

Since the central position of the core material within the molded member is maintained during injection molding, the bending direction of the molded member is not biased and a natural bending state can be maintained, resulting in the molded member having excellent bending performance.

In addition, shrinkage after molding can be effectively suppressed, resulting in excellent dimensional accuracy. In addition, the repeated bending ability is good, and it is possible to prevent cracking of the molded member due to differences in thermal shrinkage rates.

In addition, 1. Although the above-mentioned embodiment relates to the IIIJ1 part of the doll, the arms and body parts can also be molded using the -1-mention and the turning area.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the core material used in the present invention, Fig. 2 is a vertical sectional view of the core material, and Fig. 3 is a mold showing the state in which the core material is set in the mold. Longitudinal cross-sectional view, Figure 4 (a) (b)
1 is a top view of a leg member of a molded doll. Symbol S: molding space, 1: core material, 2: core metal,
3... Aggregate, 4... Bent part, 4a... Tip of core metal, 5... Meandering part, 6... Bent part, 7... Core metal holding part, 8... ... Core part, 9 ... Holding groove, 13 ... Receiving hole, 15a, 15b ... Break-off It opening 1 part, 16
... Spacing protrusion, 20, 21... Mold, 22...
・Insertion hole, 23... Sandwiching part Patent applicant Takara Co., Ltd. Agent Patent attorney Segawa
Mikio Figure 1 Child Thread Self-indulgence (→ (Method) June 1985 411 1. Indication of the incident 1985 Patent IMl No. 11393 2. Name of the invention Method for manufacturing synthetic resin doll parts 3. Relationship with the case of the person making the amendment Patent applicant address: 4-18-16 Aoto, Katsushika-ku, Tokyo Name:
Takara Co., Ltd. Representative: Yasu Sato, 4th grade, Agent address: 1-18-4-5 Shintomi, Chuo-ku, Tokyo Date of amendment order: April 30, 1985 6 Subject of amendment: Figure 2 ( (Correction) Figure 3 (Correction) 5a Figure 4 (a) (Correction)

Claims (1)

[Scope of Claims] One end is bent and a break-off groove is formed near the end, and the other end of the metal core is meandering approximately in the middle, and a spacing retaining projection is provided outwardly. Then, it is connected to the base of the synthetic resin aggregate with a break-off groove formed at the tip to form a core material, and the core material is held in the molding space of the injection mold in the next step, and molded. 1. A method of manufacturing a synthetic resin doll member, which comprises processing. (b) The tip of the bent part side of the core metal is inserted and held in the insertion hole formed in the inner wall of the mold, while the free end of the aggregate is held between the joints of the mold. The process of holding and fixing the material at the center of the molding space within the mold. (b) A step of injecting and molding molten vinyl chloride resin into the molding space. (c) After taking out the molded doll member from the mold, the end of the aggregate and the end of the metal core protruding from the doll member are broken off and removed from the break-off groove.