JPH0731946A - Dry defatting method - Google Patents

Abstract

PURPOSE:To provide a method capable of removing oil and fat components from an article to be treated stuck with the oil and fat components without being washed using a solvent. CONSTITUTION:A large size of sawdust having a 70-98% dry degree is blown to the article to be treated on which the oil and fat components are stuck, and the oil and fat components of the article to be treated are adsorbed to the large size sawdust and removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method suitable for removing fats and oils attached to IC substrates and various products.

[0002]

2. Description of the Related Art Conventionally, the removal of oils and fats adhering to IC substrates and various products has generally been carried out by a solution prepared by dissolving a fluorocarbon or a chlorine-based organic solvent or by cleaning with light oil.

[0003]

However, such a conventional method has various problems from the viewpoint of post-treatment / disposal of the solution used for cleaning and light oil, disposal of the environment, environmental pollution and the like. The present invention has been made in view of the above circumstances, and provides a method capable of reliably and easily removing a fat or oil from a product to which the fat or oil has adhered, without performing cleaning with a solution. With the goal.

[0004]

In order to achieve the above object, the dry degreasing method of the present invention comprises spraying a sawdust having a dryness of 70% or more onto a product to which oil and fat is adhered to produce a fat and oil from the product. It is characterized in that the minute sawdust is sucked and removed.

Here, the large sawdust can absorb oil and fat if the dryness is 70 to 98%. The higher the dryness, the faster the oil and fat can be absorbed.
Since the atmosphere contains water, it is actually about 98%. The large sawdust from which the oil and fat has been sucked up in this way can be easily disposed of by incineration or by using various fuels. Further, the large sawdust from which the oil and fat has been sucked can be separated from the object to be treated by blowing it off with compressed air or scraping it off with an appropriate means.

According to an experiment, the pressure is 300 mmA.
Inject large sawdust from the nozzle with compressed air of q or more,
When sprayed on the object to be treated with the oil and fat content, the sawdust was able to remove the oil and fat without adhering to the object to be treated. The dryness is represented by the following formula. Dryness = (weight of sawdust-weight of water content of sawdust) /
(Weight of sawdust)

[0007]

[Experimental Example] Spur gears with cutting oil adhering to the surface by machining were sprayed with various powders and granules having various suction properties such as sawdust using a nozzle with a diameter of 50 mm. A test was conducted to remove oil from the spur gear. In this case, the distance from the article to be treated to the tip of the nozzle was set to 150 to 200 mm, and the pressure of the compressed air used for injection was changed variously. The results of this test are shown in Table 1.

[0008]

[Table 1]

The following can be seen from Table 1. That is, when the sawdust with a dryness of 70 to 98% is used, the oil and fat content adhering to the surface of the gear can be surely removed, but it cannot be removed with other powders or granules. When calcium carbonate powder was used, the calcium carbonate powder adhered to the gear surface. The adhered powder cannot be easily separated from the gear even if the pressure of the compressed air is increased.

[0010]

As is apparent from the above description, according to the present invention, a large sawdust having a dryness of 70 to 98% is sprayed on the object to which the oil and fat is adhered, and the oil and fat of the object is sucked into the large saw. Since it is removed, it is possible to dryly and easily remove the fats and oils from the article to be treated without using a solution as in the past, and the sawdust used for the treatment is incinerated or various It has an excellent effect that it can be disposed of by being used as fuel or the like.

Claims (1)

[Claims] 1. A dryness of 7 is applied to a product to which oil and fat is attached.
A dry degreasing method, characterized in that 0 to 98% of large sawdust is sprayed, and the oil and fat content of the object to be treated is sucked into the large sawdust to be removed.