Method and apparatus for testing stretch film

Details Method and apparatus for testing stretch film Method and apparatus for testing stretch film

1989-01-30

1990-02-20

Raevis, Robert R.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

73159, G01N 300, G01L 504

Patent

active

049015818

ABSTRACT:
A method and apparatus for testing the properties of stretch film include collapsing a web of stretch film into a rope, anchoring the rope web at two locations and stretching an intermediate portion of the rope web a first distance in a first direction between the locations where it is anchored. The intermediate portion of the stretched roped web is displaced a second distance along a second direction transverse to the first direction and relative to the locations where it is anchored, and the tension force in the stretched roped web is measured when it is displaced the second distance. Alternatively, peripheral portions of a sheet of stretch film are secured and a central portion of the sheet of stretch film is engaged and deformed a third distance in the second direction.

REFERENCES:
patent: 2709915 (1955-06-01), Lonti
patent: 2966792 (1961-01-01), Pieri
patent: 3460379 (1969-08-01), Webb
patent: 3724266 (1973-04-01), Beckstrom
patent: 3835697 (1974-09-01), Schneider et al.
patent: 3877302 (1975-04-01), Miller
Dunn, "Testing Device", IBM Technical Disclosure Bulletin, vol. 15, No. 8, Jan. 1973, p. 2501.

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