JPS6065745A - Manufacture of scrubbing tool for horny layer, and the like of skin - Google Patents

Abstract

PURPOSE:To provide a scrubbing tool made of foam glass having relatively thick walls surrounding the closed cells, and convenient to use, by using dolomite in place of C, CaCO3, etc. as a foaming agent, and heating the glass at a relatively low temperature. CONSTITUTION:Dolomite powder is added as a foaming agent to glass powder having low softening point, such as soda-lime glass, etc., and mixed homogeneously. The mixture is sintered by heating at or below the melting point of the glass powder or at a low temperature to effect the partial melting of the glass powder. The objective scrubbing tool composed of a sintered glass powder block having high strength and having relatively thick walls 2 surrounding a number of closed cells 1 can be manufactured by this process.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for manufacturing a pumice-like abrasion tool used for abrasively removing thick skin, corns, etc.

Conventional techniques and their problems For a long time, naturally occurring pumice stone has been most commonly used as this type of tool.

This pumice stone has the advantage of being very strong and having little risk of causing skin abrasions, but on the other hand, after a certain amount of use, its abrasive action decreases significantly, and if you don't rub it with strong force, you'll end up with keratinized skin. can't be removed like this,
It was unsuitable for grinding and removing grains and the like.

Due to these drawbacks, such abrasive removal tools made of foam glass have recently appeared. As shown in Japanese Utility Model Publication No. 52-25918, superfoaming agents such as carbon and calcium carbonate are added to inorganic gantry lath powder, the mixture is placed in a heat-resistant mold, heated, foamed, and then removed from the mold. , and is manufactured by annealing.

However, in this manufacturing method, the decomposition temperature for gas generation of the above-mentioned blowing agent used in this process is 800 to 9 degrees Celsius.
Since the temperature is relatively high at 0.degree. C., there is a problem in that foam molding must be carried out at a high temperature of usually around 850.degree. Moreover, as schematically shown in Figure 2, the resulting foamed product is extremely thin, sharp, and fragile, with the membrane wall (12) that seals off the bubbles aυ almost completely crystallized into glass. . For this reason, if the grinding power is too good and you apply a little force, you may end up cutting the skin too much, and if you rub the slightly thinner parts of the skin, you are likely to get abrasions, so it is dangerous if you are not careful when using it. In addition, because it is brittle, it wears out very quickly, cannot withstand long-term use and has a short service life, and because its strength is low, it cannot be made into a product by itself. However, it also had the disadvantage that it had to be bonded to a strong material such as a hard synthetic resin sponge to make a product.

Purpose of the Invention The present invention has been made in view of the above-mentioned problems, and provides a grinding tool with a performance that is between the above-mentioned conventional pumice stone and foam glass grinding tools, that is, in terms of grinding power. It has a sharpness that is somewhere between the above two, and the wear rate is also about the middle, so the grinding force decreases over time, and it also has a certain degree of strength and a long service life.
It is an object of the present invention to provide a method for manufacturing a rubbing tool that can be easily cut and formed.

As a means to solve the problem, the present invention uses inorganic glass powder as the main material like the conventional foam glass, but without sufficiently crystallizing it in the manufacturing process. By performing the sintering process at a relatively low temperature and at the same time foaming under low temperature conditions using a unique foaming agent, it is possible to create a foamed mass under a sintered state similar to that of ceramics. By turning it into a physical object, it achieved its intended purpose.

That is, in the present invention, after adding dolomite powder as a foaming agent to a glass powder with a low softening point such as soda lime glass and mixing uniformly, the mixture is heated to a temperature below the melting point of the glass powder or with a low degree of partial melting. It is characterized by forming a closed-cell glass foam sintered body by heating at a high temperature and interfering it.

The manufacturing steps will be explained in more detail below.

Instead of conventional carbon, calcium carbonate, etc., dolomite powder is added as a foaming agent to glass powder with a low softening point such as soda lime glass and mixed uniformly. By using dolomite powder as a foaming agent, it is possible to perform foam molding at a relatively low temperature, which makes it possible to give the product the desired physical properties. be. Dolomite powder is a naturally occurring substance represented by MgCO3 (!aoox), and when heated to 650°C to 780°C, it decomposes and generates carbon dioxide scum, which can cause glass foaming. It is possible to foam and sinter the glass powder at such a relatively low temperature, and as a result, the product according to the present invention has a large number of closed cells (
The partition wall portion (2) that encloses 1) is composed of a relatively thick and strong sintered lump of glass powder.

The blending ratio of glass powder and dolomite powder is 90.5 to 98.5% by weight of glass powder and 15 to 9% of dolomite powder.
．． A preferable range is 5% by weight. That is, if the blended amount of dolomite powder is less than 1.5% by weight, there is a risk that the resulting foam will have a high bulk density due to the insufficient amount of gas generated. If the temperature exceeds that level, the decomposition products of calcium oxide and magnesium oxide may crystallize a portion of the glass, raising the softening point of the glass and making low-temperature foaming difficult.

In this way, after dolomite powder is added to glass powder and mixed uniformly, the mixture is placed in an arbitrary mold and heated to preferably 700 to 780°C in a heating furnace to simultaneously foam and mold. Let's do it. If the foam molding temperature does not reach 700℃ or exceeds 780℃, the foaming ratio may be low or non-uniform foaming may occur, or the product may have the same drawbacks as conventional foam glass products. Therefore, it is difficult to obtain the desired excellent rubbing tool. Note that the heating time is preferably 1 hour or more.

Effects of the Invention According to this invention, dolomite powder is used as a foaming agent and foam molding is performed at a relatively low temperature, so the useful life of the mold can be increased compared to the conventional manufacturing of foam glass products. In addition, the foam molding operation is easy υ, and the product can be provided at low cost. Moreover, since the scraping tool obtained in this way is made of a foamed sintered body, the cut surface of the surface exhibits a complicated uneven pattern, and the four parts, that is, the edge part of the partition wall that closes off the air bubbles, are similar to those of the cutter. It exhibits a necessary and sufficient level of excellent abrasive function or grinding force on raw skin and the like. Moreover, this grinding force is not sharp on the membrane wall of the foam glass, and it is not strong enough to cause scratches even if rubbed against the skin, and has a much better grinding function than that of natural pumice stone. Therefore, it can be used extremely conveniently for polishing and removing corn grains and raw hides while ensuring safety.

Moreover, the scraping tool obtained by this invention has excellent strength, and can be easily cut into pieces of the required thickness.
Not only can it have enough strength to withstand practical use, and the shape or form of the product can be freely selected, but foam glass does not wear out quickly and has physical properties that make it more easily worn out than natural pumice. Because of this, it can withstand relatively long-term use, does not clog the pores due to moderate surface abrasion, and always maintains its initial scratching force well over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a side view schematically showing an enlarged part of a scraping tool obtained by the present invention, and FIG. 2 is a side view of a conventional product made of foam glass. (1)...Bubble, (2)...Partition wall. that's all

Claims (3)

[Claims] (1) After adding dolomite powder as a foaming agent to glass powder with a low softening point such as soda-lime glass and mixing uniformly, this mixture is heated to a temperature below the melting point of the glass powder or at a low degree of melting to the extent that it partially melts. 1. A method for manufacturing a skin scraper, etc., which comprises forming a closed-cell glass foam sintered body by heating and sintering. (2) A mixture of 90.5 to 98.5 weight % of glass powder and 1.5 to 9.5 weight % of dolomite powder added to make the total 100 weight % is used. A method for manufacturing a tool for abrading skin thickens, etc., as described in Scope 1. (3) Manufacture of a tool for scraping skin thickness, etc. according to claim 1 or 2, characterized in that sintering is carried out by heating at 700 to 780'C for at least 1 hour. Method.