Manufacturing container or tube from paper; or other manufacturi – Bending – Form-scoring
Patent
1981-02-17
1983-06-07
Coan, James F.
Manufacturing container or tube from paper; or other manufacturi
Bending
Form-scoring
493 61, 493354, B31B 125
Patent
active
043869262
ABSTRACT:
A method, apparatus for forming, and article formed of folded, relatively rigid sheet plastic material (e.g. polyolefin is disclosed). A hinging membrane forming a flexible fold line provides stress-relief indentations in the sheet material so that the tensile and compressive strains normally produced when bending the sheet material at the folds are substantially relieved, thereby permitting efficient production of a variety of sheet plastic articles, such as folding containers and the like.
Two embodiments of the invention are disclosed.
In one embodiment, the stress-relief indentations are simultaneously formed on opposed surfaces of the sheet material at the desired fold line by an apparatus having an unheated die containing a scoring blade mounted for movement against the material to be scored, which is supported on a hard and polished platen, with the plastic sheet material arranged between the scoring blade and platen. The scoring blade and platen are brought to bear on the plastic sheet material disposed between them during the scoring operation to substantially reduce the material thickness along the fold line without substantial lateral displacement flow of the material away from the fold line. In this first embodiment, indentations are formed on opposed surfaces of the sheet material at the fold line which serves to relieve the tensile strains on the outer fold surface and compression strains on the inner fold surface normally produced when the material is bent about the fold line.
According to a second embodiment, the desired hinging membrane is formed along the desired fold line by compressing the relatively rigid sheet material by means of a wedge shaped creasing blade dimensioned to compress the sheet material along the desired line of folding to between 10% and 75% of its nominal thickness and flaring from the compressed surface to the material surface.
REFERENCES:
patent: 2552353 (1951-05-01), Troth et al.
patent: 2586744 (1952-02-01), Troth
patent: 3292513 (1966-12-01), Palmer
patent: 3334802 (1967-08-01), Gooding
patent: 3350492 (1967-10-01), Grootenboer
patent: 3359773 (1967-12-01), Stuchbery
patent: 3379814 (1968-04-01), Bracey, Jr.
patent: 3594464 (1971-07-01), Ihde
Coan James F.
Fiddler Robert W.
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