Defoaming method and defoaming device

Abstract

The objective of the present invention is to obtain an effective defoaming effect by directing a pulsed sound wave generated by shock caused by laser-induced breakdown to a liquid surface using an acoustic waveguide. A reflected wave of the pulsed sound wave generated by shock caused by laser-induced breakdown on an inner circumference face of the acoustic waveguide is directed to an opening part of the acoustic waveguide opposed to the liquid surface, and variations in periods of time in which the reflected wave in each travelling direction arrives at the opening part are reduced.

Description

technical field [0001] The invention of the present application relates to the elimination of foam on the surface of a liquid, and in particular to the elimination of the foam produced when filling various containers such as metal cans, plastic cups, tray-shaped containers, PET bottles, cans, or glass bottles with contents such as beverages. Foam defoaming method and defoaming device. Background technique [0002] In the filling process of beverages (canned beverages, PET bottled beverages, bottled beverages, etc.) in various containers, the vertical container is usually filled with beverages from above in a filling machine, and then sealed with a sealing device (folding machine, press, etc.). capping machines, etc.) are sealed by caps or caps. In addition, as an important factor for maintaining the quality of beverages and improving the taste, there are cases where reducing the amount of residual oxygen in the airtight container, in particular, removing oxygen from the hea...

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Problems solved by technology

[0010] However, such a large impact on the surface of liquids such as beverages will cause droplets to splash and adhere to the device or the condensing optical system such as the condensing lens, etc., causing contamination.

[0011] Therefore, in order to prevent the condensing optical systems such as the laser oscillator, the condensing lens, etc. from being polluted by the steam from the liquid surface, the foam point of the broken foam, etc., the position of the above-mentioned condensing optical system must be kept away from the above-mentioned liquid surface, resulting in Defoaming performance cannot be improved due to the decrease of the light concentration of the laser

[0012] In this way, the defoaming technology of Patent Document 2 proposed by the applicant is a better technology than previous defoaming technologies such as Patent Document 1, but according to subsequent research, it is found that there is still room for improvement in the following aspects: 1. The pulsed laser is irradiated on the surface of the liquid, and the focal length of optical elements such as lenses must be lengthened in order to avoid contamination by vapor from the liquid surface and foam points generated by burst foam. Improvement, 2. Pulse-shaped sound waves are generated in free space and propagate in the form of spherical waves. Only part of the above-mentioned pulse-shaped sound waves participate in the defoaming, so the defoaming efficiency decreases, so improvement is still needed to improve the above-mentioned defoaming efficiency

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