JPH07115362B2 - Manufacturing method of large wax lumps - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a wax lump, and particularly to a method for producing a large wax lump.

The large wax masses produced by the present invention are not exclusive, but are intended for use in making, for example, busts in full size for engraving.

(Prior Art) Conventionally, busts and the like are made of clay, gypsum, bronze (bronze), etc., and are hollow bodies in order to keep weight and material usage low. That is, when clay or gypsum is used as a material, it is produced by applying clay or gypsum on the core, forming a plastic image, and then removing the core, and in the case of a bronze image, forming a mold. It is manufactured by a casting method in which molten bronze is poured into this.

On the other hand, there are candles and wax figures as molded bodies made of wax. However, candles are generally small and even the largest ones have a thickness of a few centimeters, while so-called wax figures have life-size ones, etc. Since a core is used, it is not manufactured from a large lump that consists entirely of wax. That is, a solid and large wax lump has never been produced before.

(Object and Use of the Invention) The present invention has a large size, for example, a cross section having a major axis of about 50 cm and a minor axis of 40 cm.
An object of the present invention is to provide a method for producing a solid wax lump having an elliptical shape having a size of about cm or more and a height of about 60 cm or more.

The large wax lump produced by the method of the present invention is used as a material for engraving and molding a human bust, for example. The engraving in this case can be carried out either by hand or by machine engraving, in particular in the latter case the object ("human" in the case of a bust) is, for example, disclosed in JP-A-61-2416.
Data can be obtained by measuring with a three-dimensional measuring system as disclosed in Japanese Patent No. 12, and the data can be used to control the multi-axis cutter of the numerically controlled machining apparatus. The wax image obtained by engraving becomes beautiful by plating using, for example, a vacuum vapor deposition method, and can be semipermanently preserved.

(Problems to be Solved by the Invention) What is currently under consideration as the use of the large-sized wax lump produced by the method of the present invention is the engraving material as described above, and therefore, it goes without saying that the inside and outside There must be no cracks in the interior and no bubbles or cavities inside. Even if it is hand carved,
Or, even if it is subjected to machine engraving, it must have an appropriate hardness from the viewpoint of engraving.

It should be noted that when the melted wax solidifies, a decrease in volume occurs, and this phenomenon brings about an advantage such as improved releasability in the molding of small products such as candles, but the present invention is involved. In the case of large lumps, the cooling and solidification of the central part is significantly delayed from the cooling and solidification of the outer surface part.Therefore, a strain occurs during the cooling and solidification of the central part, and this strain occurs because the outer part is already solidified. As a result of preliminary experiments, it was found that the cracks could not be absorbed, and therefore cracks were likely to occur.

(Means and Actions for Solving Problems and Achieving the Purpose) Animal waxes, mineral waxes, petroleum waxes and synthetic waxes (polyethylene waxes, etc.) can be considered as material waxes, but the above problems, especially moderate As a result of various studies in consideration of various hardnesses, it has been found that a wax composition basically comprising at least two kinds of waxes having different melting points is preferable. As a result of further study on the condition that cracks and cavities do not occur, it is preferable to carry out the blending process at a high temperature in order to miniaturize the crystals that crystallize during cooling and solidification, and near the melting point by forced cooling under reduced pressure. It has been found that it is preferable to lower the temperature to and then inject it into a mold for molding.

Therefore, the method for producing a large-sized wax agglomerate according to the present invention comprises a low-melting-point wax as a main component, and a wax composition containing a high-melting-point wax mixed therein at 140 to 230 ° C. for 30 to 90 minutes and then stirring under reduced pressure. However, it is characterized in that the wax melt is cooled to around its melting point temperature, poured into a mold, and allowed to stand at room temperature to solidify.

Examples of the low melting point wax which is the main material used in the method of the present invention include paraffin wax (melting point, 53 ° C.)
Examples of the high melting point wax include polyethylene wax (melting point, 86 ° C.), carnauba wax (melting point, 83 ° C.), and blends thereof. Part of it is microcrystalline wax (melting point, 84 to bring about crystallization).
℃). The amount of the low-melting wax is about 85% by weight, and the balance is the high-melting wax. When the microcrystalline wax is mixed, it is appropriate to replace 1 part of the high-melting wax with this and mix about 2% by weight. . Blending is performed in two stages, the first stage is about 160 ° C for about 1 hour, and the second stage is about 175 ° C for about 1 hour.
A treatment of 30 minutes is suitable. The blended wax melt is then stirred and cooled under reduced pressure, and about 10 mmHg is suitable as the reduced pressure condition.

In the method of the present invention, the blending process of the raw wax mixture is carried out at a high temperature to completely remove volatile components and low-boiling components which may be present in the raw wax, thereby leaving bubbles in the product mass. This is because the wax is modified to make the wax more uniform and finely crystallize. Stirring under reduced pressure is sufficient to bring about sufficient degassing, thereby preventing bubbles from remaining in the product agglomerates, and cooling under such conditions to melt the wax melt near its melting temperature. Lowering the temperature to a low level keeps the fluidity of the wax, which facilitates the injection operation into the mold, reduces the amount of shrinkage that occurs during mold solidification in the mold, and further solidifies in the mold. This is to reduce the time required for. It should be noted that by cooling after casting in this way, the mold releasability is also improved, and the direction of shrinkage associated with solidification can be directed to the central portion, which can prevent the occurrence of cracks. Was also found. In order to further improve the releasability, a method known per se is used, that is, auxiliary means such as applying a release agent such as silicone oil to the inner surface of the mold or arranging a synthetic resin sheet is taken. You can also

(Examples, etc.) Next, the present invention will be described in more detail with reference to Examples, Test Examples and Comparative Examples.

Preliminary test a) Since the present invention is mainly intended to provide a wax mass for engraving, it is essential that the wax has an appropriate hardness. Therefore, the type of wax to be used as a main raw material is examined. As a result, it was found that paraffin wax is suitable as the main material because candelilla wax becomes too hard when it is the main material, and beeswax causes stickiness.

b) Since the wax has a low thermal conductivity, the temperature drop in the central part is delayed during the die molding. Therefore, as a measure to make the temperature at the center and the outside as uniform as possible, first, a flaky or powdered wax of the same formulation is placed in a mold, and a wax melt is injected into this to mold it, The air that was present in the voids of the solid wax could not be completely expelled, and bubbles were scattered inside the lump obtained for this reason, and the crystals were fragile due to the presence of flaws. Became. Further, when a metal rod or steel wool was inserted to mold heat in order to guide heat to the outside, mold releasability was poor. It has also been found that it is impossible to insert a metal rod or the like into a deep portion in order to form a wax block for engraving.

Example Formulation: Type Amount Ratio Melting point (wt%) (° C) Paraffin wax 86 53 Microcrystalline wax 2 84 Carnauba wax 4 83 Polyethylene wax 8 86 Heat the wax formulation of the above formulation to 160 ° C and treat for 1 hour. Then, the temperature was raised to 175 ° C. and the mixture was treated for 30 minutes for blending. The wax melt was transferred to a vacuum stirrer with scraping blades and allowed to cool to 54.5 ° C. under stirring at 10 mmHg. Since this wax melt still has sufficient fluidity, its cross section has a major axis of 52 cm and a minor axis of 40 cm.
It was oval and poured into a mold with a height of 70 cm. This mold was left at room temperature for 3 days and then demolded to obtain a wax lump. The dimensions of this wax block, that is, the elliptic cylinder, were 50 cm in major axis, 38 cm in minor axis, and 65 cm in height.

When the wax lump was visually observed from the outside, no cracks or bubbles were found. Next, when cut and examined inside, it was a substantially complete solid body, and there were no cracks or bubbles.

Comparative Example 1 A wax mass was produced in the same manner as in Example except that the wax composition having the same formulation as in Example was blended at 120 ° C., and the mold release was poor, and cracks were found in the center. .

Comparative Example 2 A wax composition having the same formulation as in Example was poured into a mold in the same manner as in Example, except that the wax was cooled to about 70 ° C., allowed to stand at room temperature for 3 days, and then demolded. A lump was obtained. When this wax block was cut, the central part was not solidified yet, and the wax in this part flowed out and had a diameter of about 15 mm.
There was a cavity of cm.

Comparative Example 3 A wax composition having the same formulation as in Example was blended in the same manner as in Example, and then allowed to cool with stirring under normal pressure. In this case, when the temperature was cooled to about 55 ° C, the fluidity was lowered and the pouring became impossible. The mold was left at room temperature for 3 days and then demolded to obtain a wax lump.

This wax mass had no cracks,
It contained numerous bubbles almost entirely.

(Effect of the Invention) According to the method of the present invention, it is possible to produce a large-sized wax lump without the inclusion of cracks and bubbles, and the casting temperature is low. Therefore, the required molding time is about 3 days at room temperature (casting). If the temperature is about 100 ° C, the required molding days will be about 7 to 10 days).

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C11B 15/00

Claims (7)

[Claims] 1. A wax composition comprising a low-melting-point wax as a main component and a high-melting-point wax mixed therein at 140 to 230 ° C. for 30 to 90 minutes, and then the melting point of the wax composition while stirring under reduced pressure. A method for producing a large wax lump, which comprises cooling to a temperature close to the temperature, injecting it into a mold, and allowing it to stand at room temperature for solidification. 2. The method for producing a large wax lump according to claim 1, characterized in that the low melting point wax is a paraffin wax. 3. The method for producing a large wax lump according to claim 1, wherein the high melting point wax is at least one of polyethylene wax and carnauba wax and microcrystalline wax. 4. The blending process is carried out in two stages, the first stage is about 160 ° C. for about 1 hour, and the second stage is about 175 ° C.
The method for producing a large wax lump according to claim 1, wherein the large wax lump is treated for about 30 minutes. 5. The method for producing a large wax lump according to claim 1, wherein the stirring and cooling are performed under a reduced pressure of about 10 mmHg. 6. The method for producing a large wax lump according to any one of claims 1 to 5, characterized in that the blending amount of the low melting point wax is about 85% by weight. 7. The method for producing a large wax lump according to any one of claims 1 to 6, characterized in that the amount of the microcrystalline wax blended is about 2% by weight.