JP2605024Y2 - Elastic mold - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic mold, and more particularly, to an elastic mold composed of an elastomer laminated film. More specifically, the present invention relates to an elastic mold in which the outermost layer is made of an oil-resistant elastomer.

[0002]

2. Description of the Related Art Conventionally, chocolates, cheeses, jellies, and the like have been used by using a mold made of an elastic material (elastomer) such as natural rubber or chloroprene rubber, that is, an elastic mold.
Methods for forming ice, kamaboko, lipstick, and the like are known. According to this molding method, a flowable molding material is introduced into the molding die from an opening of the elastic molding die, and then the molding material is solidified by heating or cooling. From the elastic mold. The removal of the molded product is performed by expanding the elastic molding die using a difference in air pressure, peeling the molded product from the die, and discharging the molded product from the expanded opening. This elastic mold is repeatedly used many times.

Conventional elastic molding dies mainly use natural rubber and chloroprene rubber as raw materials because of their good elasticity. However, natural rubber has very low oil resistance, and chloroprene rubber also has insufficient oil resistance. Therefore, when molding a molded product having a large amount of oil and fat components such as chocolate and lipstick using this elastic molding die, the elastic molding die is swelled by the oil and fat component contained in the molding material and is used repeatedly. There was a problem in that it was out of shape. Therefore, the present applicant has previously constructed the elastic mold with a multilayer film, and constituted the innermost layer of the elastic mold, that is, the portion filled with the molding material, with an oil-resistant elastomer.
It has been proposed to solve the above problem (Japanese Patent Laid-Open No. 5-5 / 1993).
7730).

[0004]

Even if the molding operation is performed using the improved elastic mold as described above, when the molded article is taken out by expanding the elastic mold using the air pressure difference.
That the elastic mold partially swells and ruptures,
In addition, a part of the elastic mold was partially tacky on the outside, and the part adhered to the molding apparatus, and the handling of the elastic mold was hindered during the molding operation. The present invention
An object of the present invention is to provide an elastic mold having excellent durability without such troubles.

[0005]

Means for Solving the Problems The present inventors have investigated the cause of the partial rupture of the elastic mold when the molded article is taken out by utilizing the above-mentioned differential air pressure, and as a result, one of the causes has been found. One reason is that when the elastic molding die is filled with the molding material, the droplet of the molding material adheres to the outside of the elastic molding die, and the portion to which the droplet adheres swells and becomes brittle. It has been found that the part which has become sticky and causes a trouble in the molding operation. Therefore, the present inventors have found that the above-mentioned disadvantages can be solved by forming the outer layer of the elastic molding die also from an oil-resistant elastomer, and have completed the present invention.

That is, the present invention is an elastic molding die composed of an elastomer laminated film, wherein the outermost layer is an oil-resistant elastomer (however, acrylic rubber is excluded). Type.

The present invention will be described in more detail. FIG. 1 shows an example of the elastic molding die of the present invention. Reference numeral 1 denotes an elastic mold. 2 is the mold body, 3 is the opening of the mold body, 4
Reference numeral 5 denotes a support portion that extends outward from the opening of the mold body in an inverted conical shape, and reference numeral 5 denotes a grip portion at the tip of the support portion. Reference numeral 6 denotes an annular frame for setting and fixing the grip 5. This elastic mold 1
The molding is performed as follows. That is, the holding part 5 is set on the frame body 6, the elastic molding die 1 is suspended, and the fluid molding material is poured from the opening 3 into the mold body 2.
Pour and fill. Then, the molding material is solidified by cooling or heating. After that, the elastic molding die and the frame are
Then, the cup is provided with a vent hole over the entire elastic mold, and the inside of the cup is depressurized by suction through the vent hole. The reduced pressure expands the elastic mold, the solidified molded product is released from the elastic mold, and is taken out from the opening.

[0008] In the present invention, the elastic mold is constituted by a laminated film of an elastomer. In FIG. 1, reference numeral 7 denotes an elastomer layer serving as a core layer. Reference numeral 8 denotes an innermost elastomer layer, and reference numeral 9 denotes an outermost elastomer layer. The elastomer layer 7 serving as a core is made of, for example, a latex such as natural rubber or chloroprene rubber, which is a material of a conventional elastic molding die, to impart mechanical properties and durability as an elastic molding die.
It is preferable to use an elastomer obtained by adding a reinforcing material such as Bon Black or Clay.

In the example of FIG. 1, the innermost elastomer layer 8 and the outermost elastomer layer 9 of the elastic mold are made of an oil-resistant elastomer such as urethane rubber or fluorine-based elastomer.
Composed of rubber . This elastic mold is formed by molding an elastic mold with an elastomer serving as a core layer, and applying an oil-resistant elastomer to the inside and outside thereof to form a film serving as an innermost layer and an outermost layer. The application of oil-resistant elastomer
It is performed by spraying, brushing, dipping, etc., using the oil-resistant elastomer as a solution or dispersion. Further, an oil-resistant elastomer is formed so as to conform to the inner layer and the outer layer of the elastic mold serving as the core layer, and this is adhered to the inner and outer surfaces of the elastic mold to form the innermost layer and the outermost layer. You may. The ratio of the thickness between the innermost layer and the outermost layer is appropriately determined in consideration of the required strength, elasticity, and the like of the elastic mold.

The inner layer of the elastic molding die according to the present invention has a structure in which the innermost layer is made of an oil-resistant elastomer as in the above-mentioned example, and the innermost layer is a kind selected from the group consisting of silicon resin and fluorine resin. An elastomer containing the above oil repellent may be used. When the innermost layer is made of an oil-resistant elastomer, the innermost layer does not swell due to the oily component in the molding material, so that a molded article with good luster can be obtained, and the oily component in the molding material is blocked by the innermost layer. In addition, the elastic mold does not penetrate to the outer layer of the elastic mold to swell and deform. When an oil repellent selected from the group consisting of a silicon resin and a fluororesin is added to the innermost layer elastomer, the releasability is improved and a glossy molded product can be obtained for a long period of time.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A production example of an elastic mold according to the present invention will be described. The following components were mixed to prepare a latex for an elastic molding die core layer. Natural rubber latex (as solid) 100 parts by weight Sulfur 1 part by weight Zinc oxide 1 part by weight Dithiocarbamate type vulcanization accelerator 0.4 part by weight Thiuram type vulcanization accelerator 0.4 part by weight Antioxidant 1 part by weight Clay 25 parts by weight Stabilizer

The original mold made of pottery is first immersed in 20% calcium nitrate and then added to the latex prepared above.
It was immersed for 10 minutes, pulled up, and dried at 90 ° C. for 30 minutes. The solidified latex was peeled off from the prototype, extracted with 1% aqueous ammonia, and then dried at 90 ° C. for 60 minutes. Thus, a core layer of an elastic mold was formed. The following components were blended to prepare dispersions of various oil-resistant resins in the innermost layer and the outermost layer of the elastic mold.

( 1 ) Dispersion of urethane rubber Urethane rubber (Superflex E-2000 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 100 parts by weight Water 100 parts by weight Surfactant (polyoxyethylene alkylphenyl ether) 0.1 parts by weight Thickener (sodium polyacrylate)

( 2 ) In the case of fluorine rubber 100 parts by weight of fluoro rubber latex (GL-152A made by Daikin) 5 parts by weight of curing agent for fluorine rubber (GL-152 B made by Daikin)

Either of the treatment agents (1) and (2) is applied to the inner surface and the outer surface of the elastic molding die core layer to form the innermost layer and the outermost layer. Made an elastic mold. The coating was performed by spraying. Drying was carried out at a temperature and for a time sufficient for each treating agent to form a strong film. That is, in the case of urethane rubber 90
C. for 1-2 hours. 5 for fluorine-based rubber
After drying at 0 to 70 ° C for 10 to 20 minutes, it was heated at 150 ° C for 20 to 40 minutes, depending on the heat resistance of the base rubber.

[0017]

The elastic molding die of the present invention has an oil-resistant elastomer layer formed on its outermost layer, so that when molding a molded article containing an oil or fat component, droplets of the molding material are removed from the elastic molding die. Even if it adheres to the outside, the adhered portion does not swell and becomes weak or sticky. Therefore, when removing the molded product by expanding the elastic mold using the air pressure difference, partial abnormal swelling of the elastic mold based on the swelling and weakening is prevented, and its rupture is prevented to improve durability. be able to. Also, the outside of the elastic mold is partially tacky,
The portion does not adhere to the molding device or the hand and does not hinder the handling of the elastic mold during the molding operation.

[Brief description of the drawings]

 FIG. 1 is a sectional view of the elastic mold according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Elastic molding type, 2 type | mold main-body part, 3 opening parts, 4 support parts, 5 holding parts 6 frame, 7 core layer, 8 innermost layer, 9 outermost layer

Continued on the front page (72) Inventor Hiroshige Kono 7-2-35 Higashio Higashio Arakawa-ku, Tokyo Asahi Denka Kogyo Co., Ltd. (72) Inventor Osamu Tsuchiya 7-2-35 Higashi Oku Arakawa-ku, Tokyo Asahi Denka Kogyo Co., Ltd. (72) Inventor Shinobu Sugiyama 7-35 Higashio, Arakawa-ku, Tokyo Asahi Denka Kogyo Co., Ltd. (56) References JP-A-5-57730 (JP, A) JP-A-6-320556 (JP, A ) Jpn. Hei 5-22071 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 33/38-33/40

Claims (1)

(57) [Scope of request for utility model registration] 1. A elastomer - an elastic molding die composed of a laminated film of, its outermost oil resistance elastomer - (however
And an acrylic rubber is excluded) .