| 主权项 |
1. An envelope adapted to be permanently closed and later opened, the envelope comprising:
a front panel and a rear panel having top, bottom, and opposite side edge margins, the front and rear panels being joined together along the bottom and side edge margins and being unjoined along the top edge margins, the joined edge margins and the panels defining an envelope interior and the unjoined top edge margins defining an envelope opening in communication with the envelope interior; and a closure having a top edge margin, a bottom edge margin joined to the top edge margin of the rear panel, and a height extending from the bottom edge margin of the closure to the top edge margin, the closure having opposite sides and a width extending from one to the other of the opposite sides, the closure having an interior surface, an exterior surface, and a thickness extending from the exterior surface to the interior surface, the envelope being configured such that the interior surface of the closure is sealable to the front panel of the envelope to permanently close the envelope opening, the closure comprising:
a closure panel extending along the width of the closure and defining at least a portion of each of the exterior and interior surfaces of the closure, the closure panel being formed of a first polymeric material having a tear strength, anda tear band coextruded with the closure panel to form the closure, the tear band extending along the width of the closure at a location spaced apart from the top of the closure along the height of the closure and being formed of a second polymeric material having tear strength that is lower than the tear strength of the first polymeric material. |
