JP6506794B2 - Slash mold - Google Patents

Description

  The present invention relates to a slush mold.

  Conventionally, soft hollow toys and the like are often formed by blow molding or slush molding.

However, in the case of blow molding, since a parting line is formed on the product, depending on the part where the parting line appears, the appearance may be lost and the product value may be reduced.
In contrast, slush molding has the advantage that no parting line is formed on the product, and the mold is also inexpensive, which makes it possible to mold soft hollow toys of this type. Is very suitable.
However, in the conventional slush molding, when there is a molding area (undercut part) of a projecting part which protrudes in the injection direction (the height direction of the mold) of the molten material from the molding area of the molded article body part in the mold In the process of pouring the molten material, air may be accumulated in the forming area, so the molten material may not reach. When molding is performed under such circumstances, molding defects may occur in the molding region of the projecting portion, and improvement has been desired.
Moreover, in blow molding, although the thing provided with a mechanism for removing the air accumulated in the molding area (undercut part) of such a projecting part is known, it must be equipped with such a mechanism separately. There is a problem in that the cost of the mold is increased and the size of the entire apparatus is increased (see Patent Document 1). Furthermore, when such a mold is used, there is a possibility that marks due to the air injection hole and the air vent hole will be left in the molded product, and the appearance of the molded product may be impaired.

JP 2000-189680 A

  An object of the present invention is to provide a slush mold having no possibility of occurrence of molding defects due to the inability of materials to reach, in order to solve all the problems described above.

In order to achieve the above object, the technical means according to the first aspect of the present invention is a main body molding area for molding a hollow molded article main body;
An opening in communication with the body molding region and for injecting molten material;
A second forming area for forming a hollow projecting portion which protrudes from the body forming area in the pouring direction of the molten material and is in communication with the forming body;
A first conduit provided in communication with the opening for injecting and guiding the molten material;
And a second pipe line which is branched from the first pipe line to be communicated with the second molding area and which injects and guides the molten material. It is.

According to a second aspect of the present invention, in the first aspect, the first pipeline is formed in a large diameter cylindrical shape.
The second pipeline is formed in a tubular shape having a diameter smaller than that of the first pipeline,
A portion where the second pipeline and the second molding area communicate with each other is further formed to have a smaller diameter, thereby providing a slush mold.

  According to the present invention, it has been possible to provide a slush mold having no possibility of occurrence of molding defects due to the material not reaching.

FIG. 1 is a schematic perspective view showing an embodiment of a slush mold of the present invention. It is a schematic sectional drawing of the metal mold | die for slush molding of this embodiment. It is a schematic sectional drawing which shows the state which is pouring the molten material in the metal mold | die for slush molding of this embodiment. It is the schematic which shows the state which has applied the centrifugal separator to the slush shaping | molding metal mold | die of this embodiment, and has removed the bubble in molten material. It is a schematic sectional drawing which shows the state which heats the slush molding die of this embodiment containing a molten material, and gelatinizes (hardens) a molten material. It is a schematic sectional drawing which shows the state which has discharged the unnecessary molten material in the metal mold | die for slush molding of this embodiment after gelatinization. It is a schematic sectional drawing which shows the state put in the electric furnace, in order to bake up the molten material adhering to appropriate thickness on the wall surface in the metal mold | die for slush molding of this embodiment. It is a schematic sectional drawing which shows the state which has put and cooled the metal mold | die for slush molding of this embodiment in a water tank. It is a schematic sectional drawing which shows the state in which the molded article is shape | molded in the metal mold | die for slash molding. It is a schematic sectional drawing which shows the state which has taken out the molded article from the inside of the metal mold | die for slush molding of this embodiment. It is a schematic perspective view which shows the molded article of the state with a burr | flash taken out from the metal mold | die for slush molding of this embodiment. It is a schematic perspective view which shows the molded article of this embodiment after removing a burr | flash in the state seen from the bottom face. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic perspective view shown in the state which looked at the molded article of this embodiment from the plane.

As shown in FIG. 13, the molded article 100 molded by the slush molding die according to this embodiment is, for example, a toy toy that imitates the appearance of a pig whose outer shape is rounded, and is a molded article main body. And a nose 100c and an ear 100d, and four legs 100b constituting a protruding portion (the tail is not shown). In the present embodiment, the eye 100e and the nose hole portion 100f are painted with a brush after molding, but a portion for molding the eye 100e and the nose hole portion 100f is provided in the mold It may be integrally molded.
The molded product is not limited to the pig animal toy toy, and may be another animal toy toy or may not be a toy toy.

The slush molding die of the present embodiment will be described with reference to the drawings.
A mold for slush molding (hereinafter simply referred to as a mold) 1 is, for example, a mold main body 2 for forming a molded article by adhering a molten material P such as a vinyl chloride resin, and a hollow molding of the mold main body 2 It comprises a first conduit 3 and a second conduit 4 for injecting the molten material into the region.

  The mold main body 2 is a hollow molded article main body, a main body molding area 2a for molding a hollow body 100a in this embodiment, and a pouring direction of the molten material from the main body molding area 2a (symbol H in FIGS. 1 to 4). And a second molding area 2b for molding the foot 100b in the present embodiment. The second molding area 2b projects in the height direction of the mold shown in FIG. 1 and communicates with the molded product body (body 100a).

The mold body 2 of the present embodiment has an internal space 21, and as described above, the inner surface shape is configured so as to be able to mold the appearance form of the pig toy toy.
The inner surface of the main body molding area 2a has an oval shape (oval appearance in appearance) corresponding to the body 100a of the pig animal toy toy which is a molded article, and the nose portion 100c and the ear portion at a predetermined position of the inner surface Concave regions 21a and 21b corresponding to 100d are provided.
The second molding area 2b corresponds to the four conical legs 100b of the pig animal toy toy in the present embodiment, and has four conical shapes communicating with the internal space 21 of the main body molding area 2a. Four conical projections are formed on the outer surface (bottom outer surface) of the main body molding area 2a so as to have an internal space.

  At a predetermined position of the main body molding area 2, an opening 22 for injecting the molten material into the internal space 21 is formed in communication, and the lower end of the first pipeline 3 is integrally formed with the opening 22. It is in communication.

In the present embodiment, the mold is configured such that the foot 100b of the animal toy toy is molded in a state of being directed upward as shown in FIG. 12 (see FIGS. 1 to 3).
That is, the mold is configured such that the animal toy toy, which is a molded article, is molded in an inverted state, and the openings 22 are four in the main body molding area 2 as shown in FIG. 1 to FIG. In a region surrounded by the second molding region 2b, that is, at a position corresponding to a belly portion (a portion surrounded by four feet 100b in FIG. 12) of the body 100a of the animal toy toy to be molded A circular opening 22 for filling the molten material P is formed in communication with the internal space 21.
As a result, the hole 100g is formed at the position corresponding to the opening 22 in the belly of the molded animal toy toy, but by providing a lid (not shown) capable of opening and closing the hole 100g. There is no particular problem in practical use. On the contrary, when the hole 100g is formed at a position where the appearance looks good, for example, on the back side of the body 2a, it is not preferable in terms of the aesthetics of the product.

  The material of the mold 1 is not particularly limited and can be changed in design within the scope of the present invention, and the molten material P of the molded article 100 is not limited to vinyl chloride resin, and is made of soft material. Design changes can be made within the scope of the present invention as long as the hollow molded article can be formed.

As shown in FIGS. 1 to 10, the mold 1 is provided with a receiving portion 5 integrally formed with an upper end of a first pipeline 3 described later.
For example, the receiving portion 5 is formed in a rectangular shape as a whole, and the upper end peripheral edge is surrounded by four wall sides 5a of a predetermined height to form a predetermined storage area 5b.
And in the central region of the lower surface 5c of the receiving portion 5 constituting the storage region 5b, the lower end opening is in communication with the upper end opening of the first conduit 3 described later in communication with the opening 22 of the mold main body 2, A circular through hole 50 for injecting the molten material P into the opening 22 of the mold body 2 is provided.
Further, in the present embodiment, an arbitrary wall side 5 a is selected, and the holding portion 6 for holding the mold 1 is provided. This holding portion 6 has a handle member 61 integrally formed on the outer surface of any wall side 5a, and ring portions 62, 62 connected to the arm 7 of the centrifuge shown in FIG. . One ring portion 22 is integrally formed on the upper surface of the side 5a on which the handle member 61 is integrally formed, and the other ring portion 62 is opposed to the side 5a on which the one ring portion 22 is provided. It is integrally molded coaxially on the top surface of the wall 5a.
In addition, while the receiving part 5 and the holding | maintenance part 6 are arbitrary structures in this invention, each form, arrangement | positioning position, etc. are not limited to this embodiment, Design change is possible within the scope of the present invention is there.

The lower end opening communicates with the opening 22 of the main body molding area 2a, and the upper end opening communicates with the through hole 50 of the receiving portion 5, and the molten material P is formed in the internal space 21. The first pipeline 3 for injection and guidance, and a branch from the first pipeline 3 are provided in communication with the second forming area 2b, and the molten material P is injected into the internal space 21 through the second forming area 2b. It is comprised by the 2nd pipe line 4 to guide.
In the present embodiment, four holes 24 communicating with an upstream position in the first pipeline 3, for example, a position near the through hole 50 of the receiving portion 5, are formed, and four holes 24 communicating with the four holes 24 are formed. The structure which branches the 2nd pipe line 4 is employ | adopted.

  The first pipeline 3 is formed to have a predetermined thickness, and in order to quickly fill the molten material P in a heated state, the upper end opening integrally communicated with the large diameter through hole 50 of the receiving portion 5. The lower end opening is in communication with the opening 22 of the main body molding area 2a which is smaller in diameter than the upper end opening. The hollow region 2a is inclined in a substantially conical shape from a large diameter to a small diameter so that the molten material P cools and does not harden and remains in a sol shape, so that the internal space 21 can be poured in a short time.

The second pipeline 4 has the same predetermined thickness as the first pipeline 3 and has a cylindrical shape smaller in diameter than the first pipeline 3, specifically, the diameter gradually decreases toward the second molding region 2 b It is formed in the shape of a deformed conical cylinder, and is provided in communication with the second molding area 2b.
That is, the second pipeline 4 is a pipeline for injecting the molten material P into the second forming area 2b positioned as a so-called undercut portion, in which air is stagnant and the molten material P is less likely to spread. After the molded product is molded in the molding area 2b, the resin portion molded in the second conduit 4 is treated as a burr Q.

  The portion (joint portion) where the second molding region 2b of the mold body 2 and the second pipeline 4 communicate with each other is formed to have the smallest diameter (thin). That is, in the mold body 2, a small circular communication hole for filling the molten material P in the portion of the tip of the second molding area 2b (the upper part of the four second molding areas 2b in the figure). It has a part 23.

By making the communication hole portion 23 the smallest diameter, the resin is cured in the mold, and the body 100a molded in the first molding area 2a and the foot 100b molded in the second molding area 2b When taking out (withdrawing) the burr Q formed in the first conduit 3, the connecting portion between the burr Q formed in the second conduit 4 and the foot portion 100b is forcibly cut off (division Can be taken out (extracted) from the opening 10 together with the respective burrs Q.
FIG. 11 is a view in which the molded product taken out of the mold is left to cool at normal temperature, and the vicinity of the tip of the foot portion 110b is given the reference numeral 101 as a cut region.

The first conduit 3 and the second conduit 4 are not limited to the present embodiment and can be designed and changed within the scope of the present invention.
Moreover, although the 2nd pipeline 4 is formed according to that four foot parts 100b of an animal toy toy are formed, it is not limited to this number, but branches from the 1st pipeline 3 Then, at least one hollow region communicating with the mold main body 2 may be formed, and for example, in the case of a bird toy, there are two.

The new mold construction, in which the second channel 4 is provided together with the first channel 3, has not been present in the conventional slush mold as far as the applicant knows. That is, in the conventional slush mold, for example, only the first pipeline 3 is used to pour the molten material P into the internal space 21 and take out (draw out) the molded product from the through hole 50.
When the molten material P is injected from only the first pipeline 3 into the internal space 21 in such a conventional technique, the air in the closed second molding area 2b has no escape space and air remains, and the second molding area The molten material P can not be completely filled up to 2b, and there is a possibility that a defective product in which bubbles are formed in the foot 100b of the molded product may occur.

  According to the present embodiment, by providing four second pipelines 4 branched from the first pipeline 3 and each communicating with the second molding area 2b, a route different from the opening 22 of the body portion 100a is provided. However, the molten material P can be efficiently filled into the second forming area 2b, and the air accumulated in the internal space 21 is also released to the outside from the opening 22 and removed by the centrifugal separator. Be bubbled. As a result, the molten material P can be filled up to the tip portion of the second molding area 2b (foot portion 100b), and defective products due to air bubbles can be eliminated.

  Next, a molding method for molding a resin molded product using the slush molding die of the present embodiment will be described.

  First, a predetermined amount of sol-like molten material P is poured into the entire mold 1 (FIG. 3).

FIG. 3 shows an outline of a step (first step) of injecting a molten material P made of sol polyvinyl chloride (soft vinyl) into the mold 1.
As shown in FIG. 3, when the sol-like molten material P is injected (poured) from the through hole 50 of the mold 1 into the first pipeline 3, the mold 1 from the first pipeline 3 through the opening 22. The molten material P is filled in the internal space 21 of Then, when the molten material P is continuously injected, the molten material P which has filled the internal space 21 and has risen in the first conduit 3 is then opened into the first conduit 3. It flows into the respective second pipelines 4 through the four holes 24. The molten material P that has flowed into the second conduit 4 is also filled in the internal space 21 of the second forming area 2 b via the hole 23.
Then, when the pouring operation of the molten material P is further continued, after filling the internal space 21 of the second forming area 2 b, the inside of the second channel 4 is also filled and the upper portion of the through hole 50 is filled.

  Next, the mold 1 filled with the molten material P is attached to a centrifuge, and the mold 1 is rolled to adhere the molten material P to the inner surface in the mold 1 (FIG. 4).

FIG. 4 is a step (second step) of degassing with a centrifuge.
In the embodiment shown in FIG. 4, it is shown that the two molds 1 are rotationally connected in a clockwise direction by connecting the ring portions 62 and 62 of the holding portion 6 with the centrifuge arm 7. Since the molten material P contains many air bubbles, it is necessary to rotate the mold 1 (about 5 seconds to 7 seconds) by a centrifugal separator to remove the air bubbles.
That is, if the defoaming is not carried out, a gap due to air bubbles is formed in the molded product. In addition, by rotating the entire mold 1, the molten material P can be uniformly distributed to the internal space 21 of the mold 1.

  Thereafter, the molten material P is gelated (hardened) by heating (FIG. 5).

FIG. 6 shows a step (third step) of curing the molten material P in the mold 1.
In the embodiment shown in FIG. 6, it is shown that the mold 1 is immersed in a heated oil bath 8 and the defoamed molten material P in the mold 1 is gelled (cured) to an appropriate thickness. ing.
The temperature of the oil 8a is, for example, about 180 degrees C. to 190 degrees C., and is dipped for about 10 seconds to 60 seconds. The molten material P on the inside of the molded product 100 to which heat is transferred from the surface of the mold 1 is gelled (hardened), and the gelled (hardened) film-like body having a predetermined thickness is formed along the inner shape of the mold 1 Ru.

  Then, the mold 1 is inverted to remove the unreacted molten material P (FIG. 6).

FIG. 6 shows a step (fourth step) of removing the unnecessary molten material P in the mold after gelling (curing) the molten material P.
In the embodiment shown in FIG. 6, it is assumed that the mold 1 is inverted and gelation (hardening) is performed to remove excess molten material P other than the molten material P1 adhering to the inside of the mold 1 from the mold 1. It shows. As a result, when the molten material P which has become unnecessary is removed, the gelled (cured) molten material P1 remains with a certain thickness inside the mold 1 (see FIG. 9).

  Then, it is again heated in an electric furnace, and it cools and solidifies completely after that (FIG. 7, FIG. 8).

  FIG. 7 shows a final baking step (fifth step) of heating and finishing the mold 1 after the fourth step in the electric furnace 9 for a predetermined time. It is also possible to use the thermal solvent (oil 8a) of the oil bath 8 used in the third step instead of the electric furnace, and immerse the mold 1 in the thermal solvent (oil 8a) for a predetermined time to finally bake it. The design can be changed as appropriate.

  FIG. 8 shows a state in which the mold 1 heated in the fourth step is dipped in the water bath 10 and cooled with the water 10 a because the molded article 100 can be molded in the mold 1.

  By passing through such a process, the hollow body 100a formed in the first forming area 2a and the body 100a are integrally formed in the second forming area 2b in the mold 1. A hollow foot portion 100b, a hollow burr Q integrally formed with the body 100a in the first conduit 3, a burr Q molded in the first conduit 3 and the foot portion 100b The hollow burrs Q integrally formed in the second conduit 4 are formed with substantially the same thickness (FIG. 9).

Then, when the molded product thus molded is pulled out from the through hole 50 and forcibly pulled out, the burr Q and the second molding area 2b are formed in the second pipeline 4 at the time of the pulling out. The polyvinyl chloride resin is soft and the hole 23 has an extremely small diameter, and the portion formed in the hole 23 is thin-walled by continuing to pull out the connection portion with the foot 100b formed into Because of this, it is possible to forcibly cut (divide) the connection part. Therefore, the burr Q in the second conduit 4 and the foot 100 b in the second forming area 2 b are separated from each other, and the burr Q in the second conduit 4 is pulled out of the second conduit 4 as it is. The foot 100b in the second molding area 2b can be taken out (pulled out) through the interior space 21 and the first pipeline 3 together with the body 100a (FIGS. 10 to 11).
Thereafter, the burrs Q are removed, and the eye 100e and the nose hole portion 100f are painted to form a final molded product (product) (FIGS. 12 to 13).

FIG. 11 shows the state of the molded product 100 taken out in this step, and the space between the tip end of the foot 100b and the burr Q is cut (the cut portion is indicated by reference numeral 101 in FIG. 11). ). The burr Q is cut at the proximal end portion of the burr Q formed by the first conduit 3, that is, at the area corresponding to the opening 22 of the mold 1. Therefore, as shown in FIG. 12, the hole 100g is formed in the central region surrounded by the foot 100b of the body 100a. Although not shown, it is also possible to provide a lid which can open and close the hole 100g.
In the subsequent steps, extra burrs are removed from the product to make a finished product, and further work such as painting of eyes and nose holes is performed (FIGS. 12 to 13).

  The slush mold of the present invention can be used not only for animal toys and molded articles of toys, but also for automobile parts and household goods using soft vinyl.

Reference Signs List 1 mold 2 mold body 22 opening 2a body molding area 2b second molding area 3 first pipeline 4 second pipeline 100 molded article 100a body 100b foot H injection direction of molten material (mold height direction)

Claims (2)

A body molding area for molding a hollow molded article body;
An opening in communication with the body molding region and for injecting molten material;
A second forming area for forming a hollow projecting portion which protrudes from the body forming area in the pouring direction of the molten material and is in communication with the forming body;
A first conduit provided in communication with the opening for injecting and guiding the molten material;
And a second channel branched from the first channel and provided in communication with the second molding area to inject and guide the molten material. The first pipeline is formed in a large diameter cylindrical shape,
The second pipeline is formed in a tubular shape having a diameter smaller than that of the first pipeline,
The slush molding die according to claim 1, wherein a portion where the second pipeline and the second molding area communicate with each other is formed to have a smaller diameter.

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