Method of making packaging using a tinted adhesive laminate
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United States of America Patent
Stats
-
May 25, 1982
Grant Date -
N/A
app pub date -
May 5, 1980
filing date -
Feb 29, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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