Method and apparatus for metered pre-stretch film delivery
a technology of pre-stretch film and apparatus, which is applied in the direction of helical strip wrapping, paper/cardboard containers, bundling articles, etc., can solve the problems of excessive packaging material breakage of rotating ring wrappers, limited containment force applied to loads, and supply of excess packaging materials
a technology of pre-stretch film and apparatus, which is applied in the direction of helical strip wrapping, paper/cardboard containers, bundling articles, etc., can solve the problems of excessive packaging material breakage of rotating ring wrappers, limited containment force applied to loads, and supply of excess packaging materials
US20070204565A1Inactive Publication Date: 2007-09-06LANTECH COM
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[0050] Reference will now be made in detail to the present embodiment of the invention, an example of which is illustrated in the accompanying drawings. Examples and descriptions of the invention are also set forth in the Invention Disclosure that is included as part of the provisional application and incorporated herein by reference. In addition, the disclosures of each of U.S. Pat. No. 4,418,510, U.S. Pat. No. 4,953,336, U.S. Pat. No. 4,503,658, U.S. Pat. No. 4,676,048, U.S. Pat. No. 4,514,995, and U.S. Pat. No. 6,748,718 are incorporated herein by reference in their entirety. In addition, U.S. patent application Ser. No. 11 / 398,760, filed Apr. 6, 2006, and entitled “Method and Apparatus for Dispensing a Predetermined substantially constant length of Pre-stretched Film Relative to Load Girth,” and U.S. patent application Ser. No. 10 / 767,863, filed Jan. 30, 2004, and entitled “Method and Apparatus for Rolling a Portion of a Film Web into a Cable” are incorporated by herein by refer...
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Abstract
The present invention provides a method and apparatus for dispensing a predetermined substantially constant length of pre-stretched packaging material based upon load girth. Based upon the girth of the load to be wrapped, an amount of pre-stretched packaging material to be dispensed for each revolution of relative rotation between a packaging material dispenser and the load is determined. A rotational drive system used to provide the relative rotation is linked to a pre-stretch assembly portion of the packaging material dispenser. The linkage may be mechanical or electrical. The linkage controls a ratio of the rotational speed to the pre-stretch assembly dispensing speed, such that the predetermined substantially constant length of pre-stretched packaging material is dispensed for each revolution of the packaging material dispenser relative to the load regardless of the speed of the rotational drive. In the case of a mechanical linkage, the linkage also connects the rotational drive to the pre-stretch assembly portion such that the rotational drive also drives the pre-stretch assembly portion.
Description
[0001] This application claims priority under 35 U.S.C. §119 based on U.S. Provisional Application No. 60 / 775,779, filed Feb. 23, 2006, the complete disclosure of which is incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention relates to an apparatus and a method for wrapping a load with packaging material, and more particularly, stretch wrapping. BACKGROUND OF THE INVENTION [0003] Various packaging techniques have been used to build a load of unit products and subsequently wrap them for transportation, storage, containment and stabilization, protection and waterproofing. One system uses stretch wrapping machines to stretch, dispense and wrap stretch packaging material around a load. Stretch wrapping can be performed as an inline, automated packaging technique that dispenses and wraps packaging material in a stretch condition around a load on a pallet to cover and contain the load. Pallet stretch wrapping, whether accomplished by a turntable, rotating a...
Claims
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Patent Timeline
06 Sep 2007
Publication
US20070204565A1
- IPC
- B65B13/04
- CPC
- B65B11/006; B65B11/025; B65B11/045; B65B2011/002; B65B2210/14; B65B2210/18; B65B2210/20; B65B57/04
- Inventors
- LANCASTER, PATRICK R. III; ELDRIDGE, DAVID E.