Perforating blade/label perforating
US5487915A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Jan 30, 1996 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24314
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A web of labels, particularly linerless labels, is produced which has specially formed perforation lines that are neither too strong or too weak. Each perforation line comprises alternating cuts and ties, including a cut to tie ratio of 0.18.times.0.008 to 0.012.times.0.008, and between 30-58 cuts per inch. Where permanent adhesive is used for the linerless labels, each perforation line comprises 45-58 cuts per inch, and has a percent of hold of 45-58%, with each cut having a thickness of about 0.028 inches. When repositional adhesive is used each perforation line comprises 30-45 cuts per inch, with a percent of hold of 25-35%. At least one, and typically substantially all, of the perforation lines have substantially V or U-shaped enlarged end terminations to facilitate dispensing of the labels. The perforations are formed by applying a perforation pressure of about 500-600 lbs. per inch to a perforating blade having a number of linearly spaced carbon steel (Rockwell hardness of C-32 to C-48) teeth, with 30-58 teeth per inch and each tooth having a thickness of about 0.025-0.030 inches and a height of about 0.930-0.946 inches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.