Method of making packaging using a tinted adhesive laminate
US4331491A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1980 |
| Grant date | May 25, 1982 |
| Priority date | — |
| Expiry date | May 5, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31895
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In a method of making packaging, especially for steam-sterilizable medical or pharmaceutical products, a tinted plastics sheet is formed as a laminate (34) comprising two substantially transparent sheets (10, 30) bonded together by a tinted adhesive (15). The sheet is then heat-sealed in selected areas (50, 52, 54) to a second sheet (40) to form a pouch (56) or tube to receive the product. The arrangement ensures that one of the films will be between the adhesive and the product so that colorant cannot migrate and contaminate the product when subjected to high temperatures and vacuum during steam-sterilization. The outer film may be polyester, the inner film a heat-sealable material such as cast polypropylene, and the second sheet may be paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.