Method for fabricating stiff polymeric plastic slats for venetian blinds
OwnerSimon S. Chi Yuinventor
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Abstract
A method of producing stiff polymeric plastic slats incorporates the steps of (a) feeding a reel of planar polymeric plastic film into a roller system which includes at least one pair of rotatable entrance guide rollers; (b) guiding the polymeric plastic film through at least one pair of rotatable line marker rollers; (c) passing the film through at least one pair of truncated rollers to produce a bend in said film of 100 degrees or more; (d) passing the film through a pair of nipping rollers to convert said bend to a fold of between 120 and 180 degrees to thereby produce tension and compression in a ridge region; and, (e) flattening said film out to its final, fixed shape by drawing through a pair of soft, rotatable wheels.
Claims9
A method of fabricating stiff polymeric plastic slats for use in venetian blinds, comprising the steps of:
- feeding a reel of planar polymeric plastic film into a roller system which includes at least one pair or rotatable entrance guide rollers;
- guiding said polymeric plastic film through at least one pair of rotatable line marker rollers to produce a higher local stress concentration along a center line;
- passing said film through at least one pair of truncated rollers to produce a bend in said film;
- passing said film through a pair of nipping rollers to convert said bend to a fold of approximately 180 degrees to thereby produce tension and compression in a ridge region;
- and
- flattening said film out by drawings through a pair of soft, rotatable wheels.
Dependencies are inferred from the claim text.