| 摘要 |
<p>An opening structure is disclosed for a polymeric sheet material such as those used to form sealed packages, including sealed sterile packages for medical applications. The opening structure comprises a polymer sheet formed of a plurality of linearly extending adjacent ribs in which the polymer is highly oriented along the linear direction defined by the ribs. The ribs include portions that are generally weaker in tear strength along the direction of orientation than the remaining portions of the ribs to thereby form a more easily tearable, and thus more easily opened, portion of the polymer sheet, without otherwise weakening the mechanical integrity of the sheet.</p> |
