JPH0197611A - Elastic mold and manufacture of hollow product with elastic mold - Google Patents

Abstract

PURPOSE:To reduce the cost of a mold for a hollow product with delicate shape by using an elastic mold of rubber latex, which is cut and open for each discharge of product. CONSTITUTION:Molding material 20 is filled in the cavity 11 of an elastic mold 10 of rubber elastic, which has the same shape as the inside of a product. The elastic mold 10 is sealed with pressure and rotated to harden the material 20. This hardening process includes rotations on its axis and around a given center, so that the material 20 is deposited with a uniform thickness on the inside wall of the elastic mold 10. After the material 20 deposited inside the elastic mold 10 is hardened, the mold is unsealed by removing a fixture 41 and a sealing member, and it is cut away at the opening to take out the molded hollow product.

Description

[Detailed Description of the Invention] [Field of Application of Tojo] The present invention relates to an elastic mold and a method for manufacturing hollow products using the elastic mold, more specifically, to a method for manufacturing hollow products such as water or paste-like chikolate, kamaboko, tsumire, etc. The present invention relates to an elastic mold for hollow molding foodstuffs, stationery such as erasers, soaps, and daily necessities, and a method for manufacturing hollow products using this elastic mold.

[Prior Art] Hollow products have been manufactured and put to practical use in various fields.

The conventional manufacturing method for such hollow products generally uses a mold made of metal or plastic, and after filling the inside of the mold with a filling material, the mold is rotated to solidify the filling material inside. A manufacturing method that creates a hollow product by making the material filler, and a blow molding method that creates a hollow product by blow molding using a mold when plastic etc. is used as a filler are used. was.

[Problems to be Solved by the Invention] However, in such conventional manufacturing methods for hollow products, since hollow products are manufactured using a mold, etc., the finished product of the hollow product is limited due to the processing limit of the mold. Accuracy was determined. Therefore, it has always been difficult to manufacture hollow products with very fine patterns drawn on the outside.

In addition, since products were made using molds, etc., the cost of molds became very expensive, and the cost of molds for Ikioi products increased. It was not suitable for manufacturing products for the purpose of

Furthermore, when using molds, it is difficult to manufacture minute parts such as reverse tapers or doll limbs, and especially when the number of molds is increased,
The matching of the molds became complicated, and a fixture for fixing the molds was especially required after the mold matching was performed.

Therefore, in the present invention, an elastic mold made of rubber latex is used as a mold for manufacturing hollow products, and each time a hollow product is produced, the elastic mold is cut to take out the hollow product. By doing so, we aim to reduce the total mold cost, which is the initial cost, and by proposing an elastic mold that can produce even extremely minute shapes and a method for manufacturing hollow products using this elastic mold. This makes it possible to manufacture inexpensive hollow products with minute patterns drawn on the outside.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention includes a bag-shaped filling section for filling a filling material, and an oblong shaped filling section formed in a part of the filling section. An elastic type characterized by being formed from an opening and a horizontally elongated cylindrical support part integrally formed with a filling part from the periphery of the opening; A filling is placed in the elastic mold, the elastic mold is pressurized and sealed at the support, and then rotated to solidify the filling inside.The elastic mold is then cut to take out the hollow product. Manufacturing of hollow products by placing a filling into an elastic mold made of Muratex, sealing the elastic mold under pressure, and rotating it to solidify the filling inside.The elastic mold is then cut to produce hollow products. The present invention proposes a method for manufacturing a hollow product using an elastic mold, which is characterized in that the hollow product is taken out.

[Function] The elastic mold of the present invention includes a bag-shaped filling part for filling with a filling material, an oblong opening formed in a part of the filling part, and a part from the periphery of the opening to the filling part. It is formed from an integrally formed oblong cylindrical support part.

Further, in this method of manufacturing a hollow product using an elastic mold, a predetermined amount of filler is filled from an opening into a filling part of an elastic mold made of rubber latex, which has an internal shape to be used as a product.

As for the amount of this filler, when the amount is increased, the wall thickness as a hollow product increases, and when the amount is decreased, the wall thickness becomes thinner. Therefore, it is necessary to add a filler corresponding to an appropriate wall thickness as the final load.

Next, after filling the inside of the elastic mold made of rubber latex in this manner, the elastic mold is sealed with a support section under pressure. This pressure sealing may be accomplished by, for example, sealing the elastic mold while feeding air into the elastic mold.

The reason for pressurizing and sealing in this manner is that unless the pressure inside the elastic mold is increased slightly, there is a risk that the portion containing the filling may be deformed during subsequent rotational operation.

After filling the inside of the elastic mold and sealing the elastic mold under pressure in this manner, the filling inside the filling part is solidified while rotating the elastic mold. By solidifying the filling material inside the elastic mold while rotating in this manner, the filling material adheres to the inside of the elastic mold with a uniform thickness and solidifies, making it possible to manufacture a hollow product.

After the filling inside has solidified in this way.

By cutting this elastic mold, the hollow product can be taken out.

Therefore, the life of the elastic mold according to the invention ends after producing - hollow products.

Note that, as means for solidifying the filling inside the elastic mold described above, there are two methods: freezing and solidifying, and heating and solidifying, depending on the nature of the filling.

[Example] The following is a detailed explanation of the present invention.

First, the production of an elastic mold made of rubber latex will be explained.

However, in order to manufacture this elastic mold made of rubber latex, it is first necessary to create a manufacturing mold for manufacturing the elastic mold made of rubber latex. First, a manufacturing method for manufacturing this manufacturing mold will be explained.

First, a prototype of the product is manufactured using plaster or the like.

Next, using this plaster prototype, a female mold also made of plaster is manufactured.

Next, the undiluted solution of Setomono is poured into this female mold and fired to create a male mold made of Setomono. Furthermore, the male model made by Setomono is placed in an inconspicuous place, for example, at the bottom of a product display.

Make the cracks in advance.

Next, a supporting plate made of a plate-shaped metal plate is inserted into the crack of the male mold made of this set and fixed.

Note that this support plate can be made of heat-resistant synthetic rubber such as neoprene or butadiene-acryminitrile rubber (NER), heat-resistant synthetic rubber such as polypropylene (PP) or acrylonitrile-butadiene-styrene (ABS), without using a metal plate as described above. It can also be formed from synthetic resin or the like.

In this way, first, a manufacturing mold for manufacturing an elastic mold made of rubber latex is manufactured.

In addition, although it has been explained that the manufacturing type is manufactured using Setomono, other materials such as glass, polypropylene (PP, etc.) are also used.
) or acrylonitrile butadiene styrene (AB
Heat-resistant synthetic resin such as S).

It can also be formed of an appropriate material such as a metal with excellent corrosion resistance.

Furthermore, by forming the support plate inserted into the male mold made of Setomono into a rounded shape rather than a corner at both ends, when manufacturing an elastic mold made of rubber latex, which will be described later, can be deposited with a uniform thickness.

Furthermore, regarding the above-mentioned prototype, extreme reverse tapers or extremely sharply pointed portions are not desirable when manufacturing elastic molds.

Next, a method for manufacturing an elastic mold made of rubber latex using such a manufacturing mold will be explained in sequence.

However, there are types of elastic molds made of rubber latex in which the filler filled inside hardens by freezing, such as ice, and molds that harden by heating, such as kamaboko. Furthermore, there are some foods such as chocolate that have a fat content that cannot be ignored.

Therefore, since it is necessary to change the components of the rubber latex depending on the use of such elastic molds made of rubber latex, methods for manufacturing elastic molds for each use will be explained below.

[First Example 1 This first example relates to a method of manufacturing an elastic mold for molding something that hardens by freezing, such as ice.

First, the production mold and support plate as described above are shower-washed with clear water to remove dirt adhering to the production mold, and then dried in a dryer at about 60 to 80°C for about 20 minutes. let

Next, the production mold and support plate were pretreated with Tokai solution containing 40 parts by weight of calcium nitrate, 0.5 parts by weight of glycerin, and 59.5 parts by weight of methanol. immerse in it.

During this immersion, it is desirable to support a support plate and immerse the mold in such a manner that it hangs from the support plate, in order to prevent the inclusion of air bubbles or to equalize the film thickness, and for ease of operation.

Thereafter, the production mold and support plate were pulled out of the coagulation liquid and dried for about 10 minutes in a dryer at about 70 to 80°C to volatilize the methanol and form a film of calcium nitrate on the peripheral surface of the production mold and support plate. Precipitate crystals.

The film thickness of the calcium nitrate crystals during immersion into and pulling up the coagulation liquid is generally determined by the concentration of calcium nitrate in the coagulation liquid and the pulling rate. In this embodiment, pulling is performed at a speed of about 100 mm/minute.

Note that such pretreatment is performed to uniformize the thickness of the rubber film by immersing it in a rubber latex solution for a short time, so it is acceptable to uniformize the thickness of the rubber film. Insofar as this is not necessary. It is also possible to heat the manufacturing mold in advance to about 40 to 80° C. and form a rubber film directly with heat-sensitive compounding rubber latex.

Next, after immersing the manufacturing mold and support plate that have been pretreated in this way in a rubber latex solution for about 10 to 15 minutes,
Pull up the entire surface of the manufacturing mold and place it on the manufacturing mold side of the support plate.
A rubber film of 0.8 mm"l and 0 mm is formed.

Here, the rubber latex solution was blended with the following parts by weight of solids.

60% natural rubber latex 100.0 Nonionic stabilizer 0.1 (■ Manufactured by Kao;
Emulgen 810) Potassium hydroxide 0.3 sulfur
1.0 zinc oxide
0.6 Mark captobenzothiazole 0.7 zinc salt Diethyldithiocarbamic acid 0.2 zinc salt At this time, the rubber film is formed not only on the manufacturing mold but also on the peripheral surface of the manufacturing mold side of the support plate.

Next, the manufacturing mold on which the rubber film has been formed is dried and vulcanized for about 60 to 90 minutes in a dryer at 80 to 90°C.

Next, both sides of the rubber film formed on the peripheral surface of the support plate are cut, and the cut portions are expanded using the elasticity of the rubber film to take out the production mold.

Note that both sides of the rubber film formed on the peripheral surface of the support plate are cut so as to leave a small area around the support plate.

After that, the rubber film released from the manufacturing mold was heated at 60 to 65°C.
The sample is immersed in circulating warm water for about 5 hours to remove calcium nitrate and water-soluble non-rubber components other than natural rubber latex.

Further, such a rubber film is left to dry in a dryer at 70 to 80° C. for about 15 hours to obtain an elastic type 1.

The elastic mold thus obtained is formed of a bag-shaped filling part corresponding to the production mold and a support part corresponding to the support plate, and the support part is an opening having the same width as the thickness of the support plate. This means that it has been formed.

The various properties of the rubber mold thus obtained are as follows.

(I plex肚yutLLI*) Normal state Tensile strength at low temperature (Kgf/c theory 2) 361 5
29 Elongation (%) 900 790
SOO% tensile stress (Kgf/c+++2) 36
88 Permanent elongation (%) 3
- This test method JIS K6301 (vulcanized rubber physical testing method) Test temperature -25±1°C Low temperature normal adjustment 60 minutes (low temperature repeated extension test) Number of extensions Condition 3000 times No abnormality 5000 times No abnormality too many times Cutting This test method: Dematcher type bending tester Test temperature: -25°C Stretching cycle: 300 times/min Gauge line distance: 20 mm [Second Example J Heat-sensitive formulation to exhibit properties similar to those shown in Example 1 in summer Rubber latex for use may be formulated in the following parts by weight.

60% natural rubber latex 160.0 sulfur? 4
1.0 zinc oxide
0.6 nonionic stabilizer
0.1 (■ Kao: Emulgen 81
0) 0.7 Zinc Salt of Mercabtobenzothiazole 0.2 Zinc Salt of Diethyldithiocarbamic Acid 15% Polyvinyl Methyl Ether 2.0 (BA
Made by SF; Lutonal M 4G) At this time, 1
Even if 5% polyvinyl methyl ether is not used, 60% natural rubber latex 160.0ttf
At.

Zinc oxide 0.6 Nonionic stabilizer 0.1 (■ Kao;
Emulgen 810) 0.7 zinc salt of Mercaptobenzothiazole 0.2 zinc salt of diethyldithiocarbamic acid 25% polypropylene glycol 2.0 (Sh
ell Che layer 1cal Made of Co;Poly
A rubber latex for heat-sensitive compounding is obtained which exhibits properties similar to those shown in the first example.

[Third Example] This third example relates to a method for manufacturing an elastic mold for molding something that hardens by heating, such as a fish cake.

This third example is generally the same as the first example except for the formulation of the rubber latex solution, so the formulation of the rubber latex solution and the characteristics of the manufactured elastic mold will be explained.
Descriptions of other manufacturing steps will be omitted.

The rubber latex solution used here was blended with the following solid content weight ratio.

60% natural rubber latex 100.0 Nonionic surfactant 0.2 (manufactured by Kao;
Emulgen 911) Potassium hydroxide 0.5 Zinc white 3.0 Accelerator T T
(Tetramethylthiuram disu
lfide) (manufactured by Kawaguchi Chemical; Accel TMT)
3.0 Accelerator P X (Zinc eth71phen
yl dithiocarbasate) (Kawaguchi Chemical W
7ri-tJL, PX) 1.0 Thiourea 1.0 Anti-aging agent (henol-based) 2.0 Elastic molds manufactured using such rubber latex solutions can be used in the following situations. have

(11 fish average I) 300% modulus (Kgf/cm2) 1
3.0 tensile strength (Kgf/cm2)
321, 0 elongation (%)
900.0 (Ju (test) resistance) 300% modulus (retention rate) Zoo℃X 24H101.5% 100℃X 48H107.5% 100℃X 96H103.0% 100℃x168H100.6% Tensile strength (retention rate) 100℃X 24H95,8% 100℃X 48H92,2% 100℃X 96H8811% Zoo℃X168H78,2% Elongation (retention rate) 100℃X 24H98,5% Zoo℃x man 9,7.5%
100°C x 96H97.8% 100°C x 168H95.3% [Fourth Example 1 This fourth example relates to a method for manufacturing an elastic mold for molding products such as chocolate whose fat content cannot be ignored. be.

This fourth example is generally the same as the first example except for the formulation of the rubber latex solution, so the formulation of the rubber latex solution and the characteristics of the manufactured elastic mold will be explained.
Descriptions of other manufacturing steps will be omitted.

The rubber latex solution used here was blended with the following solid content weight ratio.

Carboxylated NBR latex 100.0 Nonionic surfactant 0.5 Potassium hydroxide
0.75 Accelerator B Z (Zin
c dibut71 dithiocarbamate
) (manufactured by Kawaguchi Chemical; Accel BZ) 0.25 zinc white 5.6 sulfur
0.5 Also, an elastic mold manufactured using such a rubber latex solution has the following properties.

(11 straight parallel I) 300% modulus (Kgf/cm2) 60
, 0500% modulus (Kgf/cm2)
175, 0 tensile strength (Kg4/cm2)
316, 0 elongation (%)
580.0 (Oil resistance and solvent resistance of blended vulcanized film) A B Said NBR latex 1.0 0.8 Natural rubber 164 112 Chloroprene
20 4 tree Here, the number is the surface a expansion rate (%
) is shown.

A: 25°C Hexane B: 25°C ASTM #2 oil immersion time: 24 hours In each of the above examples, rubber latex using natural rubber was explained as the elastic body forming solution, but in addition to this, Silicone rubber, urethane rubber, butadiene rubber, etc. as synthetic rubbers can also be used.

That is, the elastic mold forming solution used in the present invention may be any material that can ensure sufficient elongation to be suitable for use.

It can be used regardless of the ingredients. Also at this time, when the final hollow product is a food product, it is necessary to select materials with particular safety.

Next, hollow product 3 using elastic type IO according to the present invention
0 will be explained with reference to FIGS. 1 to 7.

FIG. 1 is a perspective view showing an inverted state of an elastic mold 10 for manufacturing a hollow product 30 shaped like a dinosaur, and FIG. 2 is a cross-sectional view of the same.

That is, when a hollow product 30 is manufactured using this elastic type IO, fine irregularities as shown in FIG. 1 will be formed on the surface of the collectively manufactured hollow product 30.

In both figures, the elastic mold 10 has a main body of a dinosaur, which is a filling part 11 for filling with a filling material 20, and an oblong opening 12 bored in the lower part of the dinosaur.

The opening 12 is formed from the filling part 11 and a supporting part 13 which is formed integrally with the filling part 11 . In addition, this support part 13
For convenience when taking out the manufacturing mold, cutting portions 14 that do not reach the filling portion 11 are provided on both sides in the longitudinal direction.

Using such an elastic mold 10, a predetermined amount of filler 20 is first filled into the filling part 11 of the elastic mold 10 made of rubber latex, which has an internal shape to be used as a product (see FIG. 3).

This filling is carried out through the opening 12 of the elastic mold IO after the opening 12 is located above, and filling from a filling nozzle (not shown) or the like is sufficient.

In addition, as for the amount of the filler 20 at this time, if the amount is increased, the wall thickness of the hollow product 30 will be increased, and if the amount is decreased, the wall thickness will be thinned. Therefore, it is necessary to insert the filler 20 corresponding to an appropriate wall thickness as a final product.

Next, after filling the filling part 11 of the elastic mold 10 made of rubber latex with the filler 20, the elastic mold 10 is sealed under pressure (see FIG. 4).

As this pressurized sealing, for example, pressurizing and sealing may be performed by sealing the elastic mold 10 while sending air into the inside of the elastic mold 10.

Moreover, specifically, since the opening 12 is in the shape of a support plate, the support part 13 is
It can be sealed by pressing down. Further, by sealing the support portion 13 as close to the filling portion 11 as possible, it is possible to prevent an excess portion from remaining when the hollow product 30 is formed.

Further, the pressure sealing is performed here because unless the pressure inside the 1-elastic type 1O is slightly increased, there is a risk of deformation due to the weight of the internal filler 20 during the subsequent rotational solidification.

After the filling 20 is placed inside the elastic mold IO in this way and the elastic mold IO is sealed under pressure, the elastic mold IO is
While rotating, the internal filling 20 is solidified.

Also, during this rotational solidification, it is not just rotation.

By using a combination of rotation and revolution, it is possible to obtain a hollow product 30 of the same thickness. Furthermore, by applying vibration during the rotation of the wall, it is possible to prevent the filling material 20 from adhering to an excessively thick wall, so that the wall thickness can be made more uniform.

Furthermore, during this solidification rotation, the stability of the elastic mold 10 during rotation is increased by fixing the support part 13 of the first elastic mold 10 to the rotating device i42 by the fixing member 41 (see FIG. 5).

Further, such solidification is carried out by performing treatments such as cooling, heating, humidification, etc., depending on the properties of the filling material 20.

By solidifying the internal filler 20 while rotating in this manner, the filler 20 is solidified while adhering to the inside of the elastic mold 10 with a uniform thickness, and the hollow product 3
0 can be manufactured.

Depending on the shape of the elastic type IO, for example, the limbs of a doll,
Furthermore, particular details such as fingers may be formed. In such a case.

Before solidification by rotation after filling, the filling material 20 may be positioned in such a small area in advance to allow some solidification before rotation is started.

By doing so, it is possible to make the wall thickness of the product thicker in the details than in other parts, and to prevent damage to the product due to external force or the like.

After the internal filling 20 is solidified in this way, the fixation by the fixing material 41 and the sealing by the sealing material 40 are released (
6), and the hollow product 30 is taken out by cutting the elastic mold 10 through the opening 12 (see FIG. 7).

Therefore, the life of the elastic mold 10 according to the present invention ends after manufacturing - number of hollow products 30.

[Effects of the Invention] As explained above, the present invention uses an elastic mold made of rubber latex as a mold for manufacturing hollow products, and cuts the elastic mold every time one hollow product is manufactured. By forming the hollow product in such a way as to take it out, we aim to reduce the initial cost of the entire mold, and by proposing a manufacturing method for hollow products that can create extremely fine shapes, we are able to reduce the cost. This makes it possible to manufacture hollow products with large and fine patterns drawn on the outside.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention. FIG. 1 is a perspective view showing the manufacturing mold turned over 7, FIG. 2 is a cross-sectional view of the same, and FIGS. FIG. 7 is a sectional view showing a hollow product.

Claims (1)

[Claims] 1. A bag-shaped filling part for filling with a filling material, an oblong opening formed in a part of this filling part, and an integral part with the filling part from the periphery of this opening. An elastic type characterized by being formed from a horizontally elongated cylindrical support part. 2. Filling is put into the filling part of the elastic mold made of rubber latex through the opening, this elastic mold is pressurized and sealed with the supporting part, and then rotated to solidify the filling inside, and then the elastic A method for manufacturing a hollow product using an elastic mold, characterized in that the hollow product is taken out by cutting the mold.