JPH09313106A - Production of hollow molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hollow molding by a simple operation from a material such as jelly being liquid when heated and solidified by cooling, etc., by a new method using a hollow elastic mold constituted of an elastic film. SOLUTION: A molding material (e.g. chocolate) solidified by cooling is cast and packed from the opening part 2 of a hollow elastic mold A into the hollow elastic mold A composed of an elastic film of a natural rubber. Then, the outer circumference of the elastic mold A is cooled to solidify the molding material in the inner circumference of the mold A and top of a tube 7 is inserted into an unsolidified molding material C in the center part of the mold A and sucked from other end of the tube 7. Thereby, the unsolidified molding material C is removed from the elastic mold A. Then, the elastic mold A is expanded by a method covering a cup provided with an air bent onto a mold A, sucking air in the cup from the air bent and evacuating the interior of the cup and a molded article B is taken out from the elastic mold A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hollow molded article of a substance such as chocolate which is liquid when heated and solidifies by cooling. The present invention also relates to a method for producing a molded product in which the hollow part of the molded product is embedded with another substance.

[0002]

2. Description of the Related Art Conventionally, in the manufacture of hollow molded articles, a mold (split mold) is generally made of metal or synthetic resin, and a molding material in a fluid state is placed in the mold. , Put in a volume smaller than the combined volume,
Next, while rotating this combination mold in all directions using a spinner, the molding material therein is solidified by heating, cooling, chemical reaction, etc., and finally the solidified hollow molded product is taken out from the combination mold and manufactured. It was

The mold for molding the hollow molded product is usually made by injection molding a synthetic resin such as polycarbonate. In order to mold the hollow molded product, as described above, the matching molds, that is, the left and right molds are used. Alternatively, two types of molds are required, one at the top and one at the bottom, and there is a drawback in that the molds are expensive to manufacture, especially when many types of products are produced in small quantities. In addition, the polycarbonate mating mold needs to be provided with an inverse taper or a draft for release, which limits the design of the intended hollow molded product, and has a drawback that it cannot meet the needs of consumers. Further, in order to mold a hollow molded article by rotating with a spinner using a polycarbonate mold, it is necessary to solidify the molding material by heating, cooling, etc. while simultaneously rotating the spinner in the vertical axis direction and the horizontal axis direction. Therefore, there is a drawback that the production equipment becomes large and complicated. Further, it is difficult to fill the hollow part of the hollow molded product manufactured by using this mating mold with another substance. And, in order to manufacture a molded product in which another substance is filled in the hollow molded product, a so-called one-shot depositor is known, but this method can mold only a simple shape. There is. The applicant of the present invention has previously proposed a method for producing a hollow molded article by using an elastic molding die, but the operation of the method is rather complicated (Japanese Patent Laid-Open No. 6-46756).

The present invention relates to a method for producing a hollow molded article of a substance which is a liquid when heated and solidifies by cooling, for example, a method for molding a hollow molded article using the above-mentioned mating mold, and filling a hollow portion with a filler. It is an object of the present invention to solve the drawbacks of the molding method of the produced product and to provide a novel manufacturing method which can be performed by a simple operation. Another object of the present invention is to provide a method for producing a molded product in which the hollow molded product is filled with another substance.

[0005]

That is, the invention according to claim 1 of the present invention relates to a method for producing a hollow molded article, comprising: (1)
In a hollow elastic mold that is made of an elastic film and has an opening,
A step of pouring and filling a molding material that solidifies by cooling from an opening, (2) a step of solidifying the molding material around the inner periphery of the elastic molding die by cooling the outer circumference of the elastic molding die, (3) an elastic molding die 1 for the unsolidified molding material in the center of
Step of inserting the ends of two or more tubes and sucking from the other end of the tubes to remove the unsolidified molding material from the elastic molding die, and (4) expanding the elastic molding die to elastically mold A method for producing a hollow molded product, comprising the step of taking out the molded product from a mold.

Further, the invention of claim 2 of the present invention relates to a method of manufacturing a molded article in which the hollow part in claim 1 is filled with another substance, and (1) a hollow part made of an elastic film and having an opening. A step of pouring a molding material that is solidified by cooling into the elastic molding die from an opening and filling the elastic molding die; (2) a step of solidifying the molding material around the inner circumference of the elastic molding die by cooling the outer circumference of the elastic molding die; 3) Insert the tip of one or more tubes into the unsolidified molding material in the center of the elastic molding die, and suck from the other end of the tube to remove the unsolidified molding material from the elastic molding die. And (4) filling the hollow portion from which the molding material has been removed with a substance different from the molding material, and (5) expanding the elastic molding die to take out the molded product from the elastic molding die. Manufacturing method of molded products characterized by It is.

[0007]

The present invention will be described in detail with reference to the drawings. First, claim 1 of the present invention will be described.
FIG. 1 is a cross-sectional view of an example of a hollow elastic molding die that is formed of an elastic film and has an opening, which is used in the manufacturing method of the present invention. The elastic molding die A of FIG. 1 is made of an elastic film such as natural rubber, and comprises an elastic molding die body 1 and a film-shaped support portion 3 that continuously extends outwardly in an inverted conical shape. Consists of. The tip of this support portion 3 is rolled up to form a grip portion 4. The supporting portion 3 may have a horizontal shape instead of the inverted conical shape. This elastic mold is made into a desired shape, such as a doll, made of pottery, glass, wood, metal, synthetic resin, etc., and the opening and the part for molding the support are attached to this to make the original mold. It can be easily manufactured by immersing the mold in rubber latex, pulling it up to attach the rubber latex to the periphery of the original mold, solidifying the rubber latex, and then peeling the rubber latex from the original mold. This elastic mold can be used repeatedly.

In FIG. 1, 5 and 6 are annular frame bodies. The grip portion 4 at the tip of the support portion 3 of the elastic molding die A is fitted into the concave groove portion of the frame body 5, and the frame body 6 is covered from above to fix the elastic molding die A to the frame body. Is suspended in an annular frame. The elastic molding die A is suspended as shown in FIG. 1, and the molding material C, which is solidified by cooling, is poured into the elastic molding die A through the opening 2 and filled.
The molding material in the present invention is a material such as chocolate or jelly which becomes a fluid when heated and solidifies when cooled. The molding material that has been heated to a fluid state in the raw material tank is poured from the opening 2 of the elastic molding die A using an injection pipe or the like to fill the elastic molding die body 1. FIG. 1 shows a state in which the fluid molding material C is filled.

Next, by cooling the outer periphery of the elastic mold A, the molding material around the inner periphery of the elastic mold A (elastic mold body 1) is solidified. In order to cool the outer periphery of the elastic molding die A, the entire elastic molding die A may be left in a refrigerating zone in which the solidifying temperature of the molding material is maintained or lower, or may be moved in the refrigerating zone to be cooled. Alternatively, the elastic molding die A may be cooled by blowing cold air. The molding material is cooled through the elastic film of the elastic molding die A, and solidification gradually starts from the molding material in the portion in contact with the inner peripheral surface of the elastic molding die A. The wall thickness of the hollow molded product can be appropriately changed depending on the cooling temperature and time.

When the molding material of the portion in contact with the inner peripheral surface of the elastic molding die A is solidified to a desired thickness, the tip of the tube is inserted into the unsolidified molding material of the central portion of the elastic molding die A,
The unsolidified molding material is removed from the elastic molding die A by suction from the other end of the tube. FIG. 2 shows an unsolidified molding material C.
The operation of inserting the tube 7 into the tube and sucking and removing the unsolidified molding material C is shown, showing the state of this suction. The tube 7 inserted here is made of metal or synthetic resin and is connected to a suction device (not shown) equipped with a suction device such as a suction pump. The number of this tube may be one, but two or more may be used. FIG. 2 shows an example in which one tube 7 is used and the tip end thereof is branched according to the shape of the hollow molded product. When two or more tubes are used, they are preferably used in a bundle, and the ends of the tubes are preferably bent outward according to the shape of the hollow molded product. Further, the suction device is preferably heated above the solidification temperature of the molding material. By heating in this manner, the molding material does not solidify in the tube or the suction device, and smooth suction can be performed. Further, when the unsolidified molding material is viscous and it is difficult to insert the tip of the tube into the molding material, it is possible to obtain good results by gradually moving the tip of the tube downward in the molding material.

After removing the unsolidified molding material C and leaving the solidified molding material B in the elastic molding die A, the molded product is taken out from the elastic molding die. This removal takes place in a manner known per se, i.e. by means of the air pressure difference.
3 and 4 show an example of this take-out step. First, the elastic molding die A in which the solidified molding material remains on the inner periphery is 180 ° while being fixed to the annular mold.
Then, the mold 8 is rotated to cover the elastic mold A with the cup 8 as shown in FIG. After that, the inside of the cup 8 is depressurized by suctioning from the vent 9 of the cup. Due to the reduced pressure in the cup 8, the elastic molding die A expands and the solidified molding material, that is, the hollow molding product B can be dropped and taken out.

In the above example, the cup 8 with the vent 9
The whole of the elastic molding die A, and the air in the cup 8 is sucked from the vent hole 9 to reduce the pressure in the cup 8 to expand the elastic molding die and take out the hollow molded product B. Alternatively, air may be pressed into the cup 8 to pressurize the inside of the cup 8 to extrude from the cup while the elastic molding type A is turned over, and the hollow molded article B may be extruded and taken out. Further, the cup 8 having the vent hole 9 is set on the mold frame 6 on the opposite side of the elastic molding A mold, air is forced into the cup 8 through the vent hole 9 to pressurize the inside of the cup 8 to form the elastic molding die A. The hollow molded article B may be expanded and taken out. Further, the above means may be used in combination.

According to a second aspect of the present invention, when the molding material of the portion in contact with the inner peripheral surface of the elastic molding die according to the first invention is solidified to a desired thickness, the central portion of the elastic molding die is formed. The tip of the tube is inserted into the unsolidified molding material, suction is applied from the other end of the tube to remove the unsolidified molding material from the elastic molding die, and the hollow portion from which the unsolidified molding material has been removed is The step of filling a substance different from the molding material is performed. There are various substances different from this molding material, but when chocolate is used as the molding material, it is nuts, jams, creams, cookies, granular confectionery, and the like. When it is inconvenient to leave these substances in the hollow portion, the chocolate in a fluidized state is further poured onto the hollowed portion, and the mixture is cooled and solidified so that the lid is closed. The chocolate at this time may be the same as or different from the one used for the molding material. In the invention of claim 2 of the present invention, the molding material is taken out from the elastic molding die in the same manner as in the invention of claim 1 described above.

[0014]

INDUSTRIAL APPLICABILITY Since the present invention uses the elastic molding die which can be easily molded from rubber latex by using the original mold made of pottery, glass, synthetic resin, metal, etc., the molding die can be manufactured at low cost. Moreover, it is advantageous for the production system of high-mix low-volume hollow molded products. Further, the elastic molding die is filled with the molding material, and the cooling from the outer periphery of the molding die thereafter is stopped halfway,
This is extremely convenient because a hollow molded article can be manufactured by a simple operation of removing the unsolidified molding material in the central portion by suction with a nozzle. Furthermore, there is an advantage that a product obtained by filling the hollow part of the hollow molded product with a filler and sealing the top part can be manufactured by slightly changing the manufacturing process of the hollow molded product.

[Brief description of drawings]

FIG. 1 is a view showing a state where an elastic mold is filled with a molding material in the manufacturing process of the present invention.

FIG. 2 is a diagram showing an operation of sucking and removing an unsolidified molding material in the manufacturing process of the present invention.

FIG. 3 is a diagram showing a step of taking out a hollow molded product in the manufacturing process of the present invention.

FIG. 4 is a diagram showing a step of taking out a hollow molded product in the manufacturing process of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 elastic molding die body, 2 openings, 3 support portions, 4 gripping portions, 5 and 6 annular frame body, 7 suction tube, 8 cups, 9 vent holes, A elastic molding die, B solidified molding material, C Solidification molding material

Claims (6)

[Claims] 1. A step of: (1) pouring a molding material that is solidified by cooling into a hollow elastic molding die formed of an elastic film and having an opening, and filling the molding material; and (2) cooling the outer periphery of the elastic molding die. By solidifying the molding material around the inner periphery of the elastic molding die, (3) inserting one or two or more tubes tips into the unsolidified molding material in the central portion of the elastic molding die, Of removing the unsolidified molding material from the other end of the elastic molding die, and (4) expanding the elastic molding die to take out the molded product from the elastic molding die. A method for producing a hollow molded article. 2. A step (1) of pouring a molding material which is made of an elastic film and has an opening into which a molding material which is solidified by cooling is poured and filled, and (2) the outer periphery of the elastic molding die is cooled. By solidifying the molding material around the inner periphery of the elastic molding die, (3) inserting one or two or more tubes tips into the unsolidified molding material in the central portion of the elastic molding die, A step of sucking from the other end of the molding material to remove the unsolidified molding material from the elastic molding die, (4) a step of filling the hollow portion from which the molding material has been removed with a substance different from the molding material, (5) elasticity A method for producing a molded article, comprising the step of taking out the molded article from the elastic molding die by expanding the molding die. 3. The step (4) of claim 2 is a step of filling the hollow portion from which the molding material has been removed with a substance different from the molding material, further injecting the molding material, and cooling and solidifying. The method for producing a molded article according to claim 2. 4. The method for producing a molded article according to claim 1, wherein the tube is heated to a temperature above the solidification temperature of the molding material. 5. The method for producing a molded article according to claim 1, wherein the tip of the tube is branched into a plurality of pieces. 6. The method for producing a molded article according to claim 1, wherein suction is performed while gradually moving the tip of the tube.