Plastic and nonmetallic article shaping or treating: processes – With printing or coating of workpiece – Coating or impregnating workpiece before molding or shaping...
Patent
1975-07-09
1977-01-25
Kucia, Richard R.
Plastic and nonmetallic article shaping or treating: processes
With printing or coating of workpiece
Coating or impregnating workpiece before molding or shaping...
264129, 264139, 264292, B29D 3100
Patent
active
040051650
ABSTRACT:
A method of producing book covers, which method includes cutting at least one elongated notch along the length of one side of a sheet of comparatively rigid plastics having a "memory" (as herein defined) and stretching the plastics defining the floor of the notch to alter its molecular structure so as to provide a readily foldable hinge, said stretching being effected by pressing the plastics defining the floor of the notch outwardly from the notch to raise a ridge on the other side of said sheet.
REFERENCES:
patent: 3220544 (1965-11-01), Lovell
patent: 3350492 (1967-10-01), Grootenboer
patent: 3470290 (1969-09-01), Poris
patent: 3489265 (1970-01-01), Puente
patent: 3530213 (1970-09-01), Isle
patent: 3594464 (1971-07-01), Ihde
patent: 3900550 (1975-08-01), Oliver
Kucia Richard R.
The Research Association for the Paper and Board Printing and Pa
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