Machine and method for spiral binding of sheet groups with plast

Details Machine and method for spiral binding of sheet groups with plast Machine and method for spiral binding of sheet groups with plast

1979-07-13

1981-02-10

Bell, Paul A.

Plastic article or earthenware shaping or treating: apparatus

Projection

425113, 140 923, B42B 200

Patent

active

042492785

ABSTRACT:
A method and machine for feeding plastic thread from a bulk spool, forming the thread into a spiral configuration, and inserting the spiral into a perforated sheet group so that it may be cut and bent to form a spiral binder. The machine and process is continuous and includes a first section in which the thread is softened as it moves around a mandrel, a second section where the formed thread is cooled and a final section at which the coil is fed into a perforated sheet group.

REFERENCES:
patent: 2638609 (1953-05-01), Penner
patent: 2808079 (1957-10-01), Tauber
patent: 3526692 (1976-09-01), Onaka
patent: 3940228 (1976-02-01), Griffin

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