Refuse bags with integral ties and method of manufacture

Details Refuse bags with integral ties and method of manufacture Refuse bags with integral ties and method of manufacture

1999-12-03

2001-02-06

Pascua, Jes F. (Department: 3727)

Flexible bags

Plural

C383S077000, C383S120000

Reexamination Certificate

active

06183132

ABSTRACT:

This invention relates to plastic bags and, more specifically, to plastic bags which are intended to be used as refuse bags.
BACKGROUND OF THE INVENTION
Plastic bags are commonly used for holding refuse and other material. Such bags come in various forms. One common bag is manufactured from an extruded tube of plastic, typically polyethylene, which includes a multiplicity of heat sealed welds and perforated separation lines separating the individual bags. The tube of plastic is gussetted, folded, and wound into a roll so that individual bags can be dispensed one at a time by tearing the leading bag from the roll at a perforated separation line.
In the case of a refuse bag, it is often desirable to secure the contents by tying the bag after it has been filled. Separate ties or straps may be provided for this purpose but this is not optimal since the ties can be misplaced and it is often cumbersome to hold a full bag while attempting to apply the tie.
A number of attempts have been made to provide a plastic refuse bag which is formed in such a way that the bag itself includes integral flaps or ties which can be used to tie the bag closed. Representative examples of such constructions are shown in Gim U.S. Pat. No. 4,345,712 and Greyvenstein U.S. Pat. No. 5,246,110.
The present invention provides a roll of plastic bags which are easily dispensed and opened, and which include integrally formed portions at their open ends which can be used to tie the bag after it has been filled.
SUMMARY OF THE INVENTION
A roll of plastic bags comprises a tubular web having a series of seals which form the bottoms of a series of bags, and adjacent separation lines which form the open ends of the bags. Each bag includes a tie cut-out region extending from the separation line along at least one edge of the web so that when the individual bags are dispensed, the upper portions of the bag form flaps or ties which can be used to tie the bags closed.
The method of making the bags comprises extruding a tubular form, fully gussetting the form, and, optionally, folding the fully gussetted web to form a star seal configuration. The web is sealed at predetermined intervals and separation lines are cut into the web adjacent the seal so that individual bags can be separated from the web. In accordance with the invention, a tie cut-out region is formed in each bag immediately beneath each separation line so that when a bag is separated from the web, the open end of the bag will include two or more ties which can be used to close the bag after it has been filled.


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