Air permeability detecting method and apparatus for the same

Details Air permeability detecting method and apparatus for the same Air permeability detecting method and apparatus for the same

1993-10-18

1994-11-22

Albritton, C. L.

Electric heating

Metal heating

By arc

2191217, 21912171, 21912183, B23K 2600

Patent

active

053671449

ABSTRACT:
In a method of controlling the air permeability of the hole portion of chip paper in which holes are formed by a laser, the flow rate of permeating air from an air permeable portion of a dummy prepared in advance and the flow rate of permeating air from the hole portion are respectively converted to pressures. An output from the laser is controlled such that the pressure difference between the two pressures becomes zero. Then, an influence caused by variations in suction pressure can be prevented. Accordingly, the air permeability can be detected without being influenced by variations in suction pressure.

REFERENCES:
patent: 4297559 (1981-10-01), Whitman, III
patent: 4500770 (1985-02-01), Vock et al.
patent: 4767909 (1993-08-01), Okumoto
patent: 4916272 (1990-04-01), Okumoto et al.
patent: 5117087 (1992-05-01), Baker et al.
patent: 5179965 (1993-01-01), Komori et al.
patent: 5186183 (1993-02-01), Komori et al.
patent: 5210390 (1993-05-01), Okumoto

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