| 摘要 |
This invention provides a heat-sealable, peelable composition comprising ethylene vinyl acetate copolymer, polyethylene based wax and polypropylene. The composition can further comprise a dye or an ink. The composition can be heat-sealed onto a surface of a polymeric bag to provide a peelable seal. A closure arrangement for a polymeric bag with first and second opposing films comprises first and second opposing base strips, a first peelable strip of a first color, and a second peelable strip of a second color. An outer surface of the first base strip is attached to an inner surface of the first film. An outer surface of the second base strip is attached to an inner surface of the second film. The first peelable strip is attached to the inner surface of the first base strip, and the second peelable strip is attached to the inner surface of the second base strip. The first and second peelable strips are disposed between the first and second base strips. The second peelable strip is generally parallel to and opposes the first peelable strip. The second color of the second peelable strip is lighter than the first color of the first peelable strip. The first color of the first peelable strip is visible through the second peelable strip when the first and second peelable strips are heat sealed to each other to form a peelable seal. The second color of the second peelable strip substantially masks the first color of the first peelable strip when the peelable seal is broken. Thus, breaking the peelable seal produces an irreversible color change in the peelable seal area. Such an irreversible visual change alerts a consumer that the peelable seal has previously been broken.
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