Benjamin C Rosenberg

US Patent:

44155158, Nov 15, 1983

Filed:

Apr 6, 1982

Appl. No.:

6/366058

Inventors:

Benjamin Rosenberg - Brooklyn NY

International Classification:

B29C 1902

US Classification:

264 68

Abstract:

Plastic sheet material used for forming box blanks are provided with soft, bendable score lines by applying frictional heat through rapid vibration. The sheet material is clamped under high pressure between a resilient make-ready and a scoring tool, and is subjected to the vibratory action which generates frictional heat sufficient to melt the plastic material at the engaged interface, thereby forming a score line along which the sheet material may be bent to form an assembled box. A completed box blank may be formed in a single operational step, by cutting the box, impressing the score lines, and impressing embossments, if required, simultaneously in a single operational cycle of seconds duration.