Method of forming a corner in a thermoplastic material using ult

Details Method of forming a corner in a thermoplastic material using ult Method of forming a corner in a thermoplastic material using ult

1980-01-28

1981-05-05

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264126, B06B 300

Patent

active

042658420

ABSTRACT:
A corner is formed in corrugated thermoplastic material or board using ultrasonic vibrations by disposing the corrugated material between an anvil and a half wavelength resonator having a portion of its frontal surface shaped for producing a crease. Contact is provided between the shaped portion of the resonator frontal surface and the material so as to crush the material. The resonator is rendered resonant for causing the material in contact with the resonator frontal surface to soften and flow. After a sufficient period of time, usually a fraction of a second, the frontal surface is withdrawn from contact with the material. When the softened and flowing material solidifies a crease is manifest in the material which then is folded to form a corner.

REFERENCES:
patent: 3392219 (1968-07-01), Smith et al.
patent: 4032382 (1977-06-01), Obeda
patent: 4087297 (1978-05-01), Johnson

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