United States Patent [19] [11] Patent Number: 5,041,317
Greyvenstein [45] Date of Patent: Aug. 20, 1991
[54] PERFORATED MATERIAL
[76] Inventor: Lourence C. J. Greyvenstein, 150
Senior Drive, Northcliff,
Johannesburg, South Africa
[21] Appl. No.: 350,910
[22] Filed: May 12, 1989
Related U.S. Application Data
[63] Continuation-in-part of Ser. No. 366,309, Jun. 13, 1989, Pat. No. 4,890,736.
[30] Foreign Application Priority Data
May 13, 1988 [ZA] South Africa 88/3387
[51] Int. CI.5 B65D 30/00
[52] U.S. CI 428/35.5; 206/390;
383/37; 428/43; 428/906
[58] Field of Search 428/35.2, 35.5, 43,
428/906; 383/37; 206/390
[56] References Cited
U.S. PATENT DOCUMENTS
3,762,542 10/1973 Grimes 383/37
3,851,760 12/1974 Smith 206/390
3,931,886 1/1976 Yamauchi 206/390
4,309,468 1/1982 St. Aubin 428/43
4,318,235 3/1982 Augeri 428/43
4,681,785 7/1987 Horn 428/43
4,890,736 1/1990 Greyvenstein 383/37
Primary Examiner—James J. Seidleck
Attorney, Agent, or Firm—Cushman, Darby & Cushman
[57] ABSTRACT
Continuous rolled material is described which is formed as lay flat tubing and which has lines of perforations running transversely to the axis of the material and dividing the material into discrete units. Alternate lines of perforations are sinusoidal lines. There are cuts in these lines of perforations at the mid-portions between the crests of the sinusoidal lines. The remaining perforations are arranged so that the transverse components of their lengths are substantially constant. Other kinds of perforated continuous material are also described.
18 Claims, 3 Drawing Sheets
