Importance

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Abstract

A corner formative member A includes at least two plate pieces 1a and 1a bonded with each other at side portions thereof via reactive hot melt adhesive P so as to form an apex angle portion 3 extending in a longitudinal direction. A chamfered portion 8 with a narrow width is formed on the apex angle portion 3. The chamfered portion 8 is formed into a longitudinally extended non-horizontal irregularly arranged continuous concavo-convex surface. An adhesive layer P remains at a joint portion of the apex angle portion 3 and an end face of the adhesive layer P at the chamfered portion side is a flat surface along the concavo-convex surface of the chamfered portion 8. An apparatus B for chamfering the apex angle portion 3 of the corner formative member A includes a corner formative member supporting means 20 for supporting the corner formative member A, a rotation cutting tool 30 disposed so as to intersect with the apex angle portion 3, a rotation cutting tool supporting means 20 for supporting the rotation cutting tool 30 in a vertically movable manner along a concavo-convex surface formed at the apex angle portion 3, a transporting means 21 for giving a relative movement between the rotation cutting tool 30 and the corner formative member A, and a cooling means 50 for cooling a region where the apex angle portion 3 is cut with the rotation cutting tool 30.

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First Claim