ENVELOPES WITH CLOSURE SEALS FORMED FROM REACTIVATABLE HOT-MELT ADHESIVE
Envelopes include a closure seal formed from a hot-melt adhesive. The hot-melt adhesive is reactivated after an item to be packaged is inserted into a pocket of the envelope by way of an opening defined by walls of the envelope. The reactivation of the hot-melt adhesive results in the formation of the closure seal, which affixes portions of the walls to each other so as to close the opening, causing the item to be retained within the envelope.
1 . An envelope for holding an item, comprising:
a body that includes:
a first flexible wall, and
a second flexible wall overlying the first flexible wall and affixed to the first flexible wall about at least a portion of a pocket border, which pocket border encloses a pocket defined between the first and second flexile walls and configured and dimensioned to contain the item, at least one of the first and second flexible walls defining a pocket opening allowing access to the pocket from an exterior of the envelope for loading the item into the pocket; and
a closure-sealing element disposed on the body and positioned to seal closed the pocket opening, the closure-sealing element being made of a hot-melt adhesive that:
has a sufficiently low tackiness at room temperature to enable the closure-sealing element to be separated from the second flexible wall by hand, and
is activatable when heated to a temperature above an activation temperature and, when subsequently cooled to a temperature below the activation temperature, adheres to the second flexible wall to seal the pocket opening closed to retain the item in the pocket.
2 . The envelope of claim 1 , wherein the hot-melt adhesive has a sufficiently low tackiness at room temperature to enable the closure-sealing element to be peeled from the second flexible wall.
3 . The envelope of claim 1 , wherein the hot-melt adhesive has a sufficiently low tackiness at room temperature to enable the closure-sealing element to be separated from the second flexible wall without damaging the first or the second flexible wall.
4 . The envelope of claim 1 , wherein the first and second flexible walls are affixed to each other about a first portion of the pocket border, and are unaffixed to each other at the pocket opening.
5 . The envelope of claim 4 , wherein the first and second flexible walls are unaffixed at an open side of the pocket; and wherein the pocket opening is defined by the open side of the pocket.
6 . The envelope of claim 5 , wherein the pocket opening is disposed along the pocket border.
7 . The envelope of claim 1 , wherein the pocket opening is defined between the first and second flexible walls.
8 . The envelope of claim 7 , wherein the closure-sealing element is configured to seal closed the pocket opening by affixing the second flexible wall to the first flexible wall.
9 . The envelope of claim 8 , wherein the closure-sealing element is disposed at the pocket opening.
10 . The envelope of claim 8 , wherein the hot-melt adhesive is offset from an upper edge of the first wall by a sufficient distance to permit the user to manually grasp and pull apart the first and second walls after the closure seal has been formed.
11 . The envelope of claim 8 , wherein the hot-melt adhesive is configured to be reactivated by the application of heat through at least one of the first and second flexible walls of the envelope, the application of heat being sufficient to heat the hot-melt adhesive to the temperature above the activation temperature.
12 . The envelope of claim 1 , wherein the closure-sealing element is disposed on the body in an elongated band.
13 . The envelope of claim 1 , wherein the hot-melt adhesive has a sufficiently low tackiness at temperatures of about 110° F. and below to enable the closure-sealing element to be separated from the second flexible wall by hand.
14 . The envelope of claim 1 ,
wherein the body further comprises a flap connected to the first flexible wall;
wherein the closure-sealing element is disposed on the flap; and
wherein the closure-sealing element is configured to seal closed the pocket opening by affixing the second flexible wall to the flap.
15 . The envelope of claim 1 , wherein the hot-melt adhesive has an activation temperature below about 140° F.
16 . The envelope of claim 1 , wherein the closure-sealing element and the pocket border define a gap configured to provide venting between the envelope pocket and the ambient environment.
17 . The envelope of claim 1 , wherein the at least one of the first and second flexible walls is a padded wall.
18 . A supply web, comprising a plurality of the envelopes of claim 1 connected in series.
19 . A method of making an envelope for holding an item, comprising:
providing a body of the envelope comprising a first and a second flexible wall;
affixing the second flexible wall to the first flexible wall about at least a portion of a pocket border which pocket border encloses a pocket defined between the first and second flexile walls and configured and dimensioned to contain the item, at least one of the first and second flexible walls defining a pocket opening allowing access to the pocket from an exterior of the envelope for loading the item into the pocket; and
positioning a closure-sealing element on the body to seal closed the pocket opening, the closure-sealing element being made of a hot-melt adhesive that:
has a sufficiently low tackiness at room temperature to enable the closure-sealing element to be separated from the second flexible wall by hand, and
is activatable when heated to a temperature above an activation temperature and, when subsequently cooled to a temperature below the activation temperature, adheres to the second flexible wall to seal the pocket opening closed to retain the item in the pocket.
20 . A method for packaging an item, comprising:
providing an envelope comprising:
a body including a first flexible wall, and a second flexible wall overlying the first flexible wall and affixed to the first flexible wall about a containment border that encloses a plurality of sides of a pocket defined by the first and second flexible walls; and
a closure-sealing element disposed on the body and positioned to seal closed the pocket opening, the closure-sealing element being made of a hot-melt adhesive that:
has a sufficiently low tackiness at room temperature to enable the closure-sealing element to be separated from the second flexible wall by hand, and
is activatable when heated to a temperature above an activation temperature and, when subsequently cooled to a temperature below the activation temperature, adheres to the second flexible wall to seal the pocket opening closed to retain the item in the pocket;
placing the item in the pocket; and
heating the closure-sealing element to the temperature above the activation temperature.