Title: Film web drive stretch wrapping apparatus and process

Abstract: A process and apparatus for applying stretchable plastic film to loads for containment of the loads using two connected rollers driven by the film web so that the rollers are driven at different speeds to elongate the plastic film beyond its yield point and wrapping the elongated film after it has been stretched past its yield point around a rotating load. A roller can be added to the apparatus to increase the set time for the elongated film after it is stretched by the connected rollers. In addition, a web narrowing device may be placed upstream or downstream from the apparatus to reduce the hazard of edge tear under high elongation forces.

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Inventors: Lancaster, Patrick R. (Anchorage, KY)
Lancaster, William G. (Louisville, KY)

Application Number: 06/215249
Filing Date: 1980-12-11
Publication_date: 1982-06-29
Assignee: LANTECH INC

Primary Class(es): 53/399 53/465, 53/588
Other Classes: B65B11/04; B65B11/02; B65B13/04
US Patent Ref:

2597041	May, 1952	Stokes	53/65	Apparatus for wrapping articles
2757495	August, 1956	Reichel	53/65	Process for the production of stuffed products
2854697	October, 1958	Ryan	53/588	Method of stretching plastic sheet material
2995779	August, 1961	Winter	53/588	Treatment for polymeric film to restrain gauge variation
3048895	August, 1962	Bottomley	264/146	Process for producing biaxially oriented plastic film
3052917	September, 1962	Horn	264/146	Production of wrinkle-free film
3052924	September, 1962	Ezrin	53/588	Process for the manufacture of biaxially oriented crystalline polystyrene
3068528	December, 1962	Owens	53/65	Method for conveying and stretching thermoplastic film
3104937	September, 1963	Wyckoe	264/146	Method of making a binding strap
3351697	November, 1967	Hufnagel	264/288	Stretching of polymer foils
3478142	November, 1969	Greene	264/288	METHOD OF PLEATING AND STRETCHING PLASTIC FILM
3608056	September, 1971	Nelson	264/321	STEAM RETICULATION OF FOAMED PLASTIC SHEETING
3734994	May, 1973	Blecha	264/288
3786127	January, 1974	Peet	264/288
3796785	March, 1974	Rest	264/288
3807004	April, 1974	Andersen	264/288	DEVICE FOR DRAWING THERMOPLASTIC SHEET MATERIAL
3816886	June, 1974	Van Cappelen	264/288	APPARATUS FOR LONGITUDINALLY STRETCHING FILM
3843761	October, 1974	Bierenbaum	264/210R	PROCESS FOR PREPARING A THERMOPLASTIC MICROPOROUS FILM INVOLVING A COLD STRETCHING STEP AND MULTIPLE HOT STRETCHING STEPS
3884748	May, 1975	Anderson	156/494	Process and device for the stretching of plastics sheets
4014155	March, 1977	Izawa	53/212	Coin wrapping method
4017227	April, 1977	Schmidt	425/66	Apparatus for increasing the production output of stretched flat film webs composed of thermoplastic
4050220	September, 1977	Lancaster et al.	53/588	Spiral bundler
4076785	February, 1978	Schmidt	264/146	Method of and apparatus for increasing the production output of stretched flat film webs composed of
4110957	September, 1978	Lancaster et al.	53/588	Reverse wrap
4302920	December, 1981	Lancaster et al.	53/556	Film web drive stretch wrapping apparatus and process

Other Refs: CA726075FR2281275GB1013980

January, 1966	53/556
March, 1976	53/556
December, 1965	53/556

Primary Examiner: Sipos, John
Assistant Examiner:
Attorney: Gipple & Hale

Parent Case Data:

This is a divisional application of Ser. No. 096,384 filed Nov. 21, 1979 now U.S. Pat. No. 4,302,920.