JPS5938304A - Production of aromatic sintered material - Google Patents

Abstract

PURPOSE:To produce an aromatic sintered body which retains a flavor for a long period of time by sintering a continuous green compact of metal or alloy powder and compressing only the surface or the front layer part with rolls then impregnating an aromatic liquid into the gaps under vacuum. CONSTITUTION:A powder mixture 1 consisting essentially of powders of metals or an alloy is passed and compressed through and with at least a pair of powder rolls 3 from a hopper 2, whereby the powder is molded to a continuous belt-like green compact 4. The green compact 4 is passed through a sintering furnace 5 and the sintered body 6 is compressed with at least a pair of compression rolls 7 to the extent that only the surface or front layer part is compressed. The sintered body 6 is blanked to a desired shape and, if necessary, the side faces are compressed; thereafter, an aromatic liquid is impregnated under vacuum into the body 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an aromatic sintered material. Regardless, the present invention relates to a production method that can continuously produce an aromatic sintered material in which the aromatic liquid does not leak out through the pores.

BACKGROUND ART Conventionally, metals or alloys impregnated with perfume or the like have been known as aromatic metals, but to date there have been no examples of this metal being put to practical use. The reason for this is that it is difficult to impregnate perfume, etc., there is a problem with the persistence of the fragrance, and a part of the impregnated perfume etc. tends to leach out.

In this regard, it is conceivable to manufacture a sintered body using powder metallurgy technology, which has recently made significant technical progress, and impregnate perfume or the like through the communicating pores of the sintered body. However, in this case, although the perfume is easily impregnated, the persistence of the fragrance remains.

Problems such as leaching of perfume etc. remain.

That is, when metal powder such as iron, copper, or stainless steel is compressed and sintered, pores that communicate with the outside exist in the sintered state due to the manufacturing principle. Oil-impregnated bearings take advantage of this characteristic and are impregnated with oil.The oil in this case is for bearings and has a certain degree of viscosity. Therefore, since the bearing oil and perfume etc. have different viscosity and other properties, they are usually impregnated with essential oil in which perfume is dissolved. However, unlike impregnated bearings, aromatic metals require the fragrance to last, and simply molding and sintering the powder leaves problems.

The present invention aims to solve the above-mentioned drawbacks, and specifically, it is possible to directly impregnate perfume, etc. by effectively utilizing the porosity and composite properties of a metal or a sintered body, and furthermore, it is possible to directly impregnate the impregnated perfume. The present invention proposes a method for manufacturing an aromatic sintered body in which fragrance can be maintained for a long period of time without leaching out.

Namely, the method of the present invention involves compressing powder particles containing metal or alloy powder as a main component between at least a pair of powder rolls to continuously form a continuous powder body, and then sintering this continuous powder body. Then, this sintered body is compressed by at least a pair of compression rolls to such an extent that only the surface or surface layer portion is compressed, and then the pores in the sintered body are vacuum impregnated with an aromatic liquid.

The method of the present invention will be explained in detail below.

First, metal or alloy powders are mixed in the usual manner, and as shown in FIG. 1, the mixed powder 1 is passed from a hopper 2 between at least a pair of powder mold.

In this case, the metal or alloy powder used is adjusted depending on the application, but usually iron powder, aluminum powder, copper powder, etc.
Uses stainless steel powder.

In addition, the particle size of the powder is also selected, and even in roll molding, an anti-friction agent is mixed as desired to reduce friction between the powders. Since the portion becomes a hole passage, it is also possible to satisfactorily impregnate fragrances and the like. Further, since the 'shape' is formed by powder molding, it can be molded into any shape without any cutting, but it is generally preferable to mold it into a flat shape with irregularities. Also,
It is also conceivable to perform treatments such as plating or painting on one surface to add color or gloss.

The fragrance release property deteriorates, making it undesirable as an aromatic metal.

Furthermore, powders other than metals or alloys may be mixed. By mixing powders other than metals in this way, it is possible to obtain completely unexpected and unique colors and patterns, which is suitable for use in pendants and other accessories.

Thereafter, this sintered body 6 is rolled onto at least one pair of compression rolls 7.
The material is compressed to such an extent that only the surface or superficial layer is compressed.

In general, when the powder compact formed by a pair of powder rolls as described above is adjusted, the density is highest on the front and back surfaces, and the density tends to decrease toward the center. It can be configured so that the center part tends to become coarse while the center part becomes denser. Therefore, when the green compact has this structure, a sintered body having different densities on the front and back surfaces and in the center can be obtained after sintering.

However, even the sintered body with this structure has poor perfume persistence and is not preferred as an aromatic metal. Furthermore, in order to improve the density of the sintered body and adjust its shape, compression is performed using a press, a mold, etc. after sintering. However, although this recompression can increase the density of only the surface part to some extent, the density of the inside increases accordingly, the communicating pores are irregularly closed, and the absorption of perfume and the like becomes insufficient. In this regard, the present inventors researched a compression method that increases only the density of the surface area, and found that if the sintered body is moderately compressed with a pair of compression rolls after sintering, the density of the surface area increases. It was found that only the base metal can be plastically deformed. This pressure is approximately 5 Kg/m (2 to 4 Kf/-), and even with this pressure, it is possible to increase the density only on the surface.Sintered bodies are usually cold-processed. It can be done either warm or hot.

The sintered body 6 manufactured by VC as described above is as shown in FIG.
The density of the interior 6b is kept low. 'Prior to impregnating the sintered body 6 with the aromatic brush, the sintered body 6 is punched out into a desired shape, the sides are compressed as required, and then perfume etc. are directly impregnated. let

Although it is sufficient to carry out this impregnation by a conventional method, it is usually sufficient to suck the air in the communicating pores of the sintered body in a vacuum atmosphere and then impregnate the perfume or other substance into the communicating pores.

Further, during this impregnation, the amount of impregnated perfume, etc. and the volatilization rate of perfume, etc. are closely related to the compression pressure during compression after sintering. By the way, the compression pressure is 2-4Ky/perfume 0.15-0.16f.
It was possible to impregnate to a certain extent, and the volatilization rate was almost zero after wearing on the human body, but the third pewter was 18-19%, and the 7th day was 30-30%.
327o, 9 mouth weight was 50%, but after that, it evaporated at a constant volatilization rate over 60 days, and almost all of the impregnated perfume was released without remaining in the communicating pores.

On the other hand, when the amount was 3.0 to 4.0 Kg/cJ, the amount of perfume impregnated decreased to about 0.13 to 0.14 f, but the volatilization rate showed almost the same tendency.

As explained in detail above, 1. The method of the present invention is that after sintering a green compact formed from powder particles of metal or the like, it is compressed by rolls under appropriate pressure, so that the performance of the aromatic agent impregnated with the aromatic metal can be maintained for a long period of time. You can get it.

In addition, once a certain pattern is determined for molding with rolls, the pattern has good productivity and can be molded relatively easily. Furthermore, since it is a powder molding process, it is possible to create significant unevenness on one surface.

In addition, just as the uses of fragrances are expanding to a wide range of fields,
The aromatic metal produced by the method of the present invention can be used in the entrances and toilets of ordinary homes, the inside of taxis, etc., and can also be configured as a pendant or cross-chain to increase added value with its fragrance.

The fragrance to be impregnated ranges from 100% concentration to 2.
It can be impregnated with anything from 0% perfume to 5% cologne.

[Brief explanation of drawings]

FIG. 1 is a layout diagram of an example of an apparatus for carrying out the method of the present invention, and FIG. 2 is an enlarged view showing the structure of a part of the aromatic metal produced thereby. Code l...Mixed powder 2.Old...Hopper 3.
...Powder/roll 4...Powder compact 5...Sintering furnace 6.
...Sintered body 7...Curved/compression roll 6a...
・Surface layer 6b... Internal patent applicant Shu Nishimura, representative patent attorney Naohisa Matsushita patent attorney Yoshikatsu Matsushita Fumio Soejima 1B2 drawing!

Claims (1)

[Claims] Powder particles containing metal or alloy powder as a main component are compressed between at least a pair of ladder rolls to continuously form a continuous powder body, and then this continuous powder body is sintered. After that, this sintered material is compressed by at least a pair of compression rolls to such an extent that only the surface or surface layer portion is compressed. % vacuum impregnation of aromatic liquid into the pores within the sintered body
Aromatic sintered material σ) Manufacturing method.