| 摘要 |
PROBLEM TO BE SOLVED: To provide the manufacturing method for a decorative ALC panel, which has a natural rubble-like worked pattern and a high productivity and a working jig used therefor. SOLUTION: A grooving work having a nearly trapezoidal section in such a shape that the width of the base of the section is broader than the width of the top side is executed on the surface of an ALC panel 1. After that, the inclined parts of this groove are cracked, resulting in exposing fractured faces 13 and 13' so as to form decorative faces. Next, a working jig of this groove is a cubic body having a sectional form similar to the nearly trapezoidal section and sizes a little smaller than those of the above nearly trapezoidal section.
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