Abstract: Heat-seal condition indicating packages include a first sealing substrate comprising a leuco dye and a second sealing substrate comprising a leuco dye developer. The packages may optionally include a leuco dye sensitizer which dissolves both the leuco dye and the leuco dye developer when melted. The packages further include a heat-seal produced between the first sealing substrate and the second seating substrate. The heat-seal comprises a reaction product of the leuco dye and the leuco dye developer. The reaction product may be colored, which may provide the heat-seal with a detectable optical characteristic. A magnitude of the optical characteristic may be proportion to the strength of the seal between the first and second seating substrates.

Abstract: A lidding film to use in food packaging, or the packaging of suitable non-food products, includes a substrate having an outer major surface on which is disposed at least a 5 heat-sealing layer (HS layer), a non-heat-sealing layer (NTIS layer), and a hydrophobic coating. On a side of the lidding film that corresponds to the outer major surface of the substrate is a peripheral region that encircles a central region. At least a first portion of the HS layer fills the peripheral region, and the NIS layer is absent as a cover on, or does not cover, the HIS layer in the peripheral region. At least a first portion of the NHS layer fills the 10 central region, and the HS layer is absent as a cover on, or does not cover, the NIS layer in the central region.

Abstract: The present invention is directed to heat-seal condition indicating packages having a first sealing substrate comprising a leuco dye and a second sealing substrate comprising a leuco dye developer, and a leuco dye sensitizer which dissolves both the leuco dye and the leuco dye developer when melted which is disposed in or on the surface of either the first or second sealing substrata or disposed in or on the surface of both the first and second sealing substrates. The packages of the present invention further include a heat-seal produced between the first sealing substrate and the second sealing substrate which comprises a heat-seal defect-free state which produces a visible color change within the heat-seal after heat sealing, and/or a heat-seal defect state which produces no visible color change within the heat-seal after heat sealing.

Abstract: A multilayer pouch with heat-shrinkable layer is described. The pouch comprises a first wall; a second wall; a perimeter comprising a first edge and a second edge opposing the first edge; and a product space positioned between the first wall, the second wall, and the perimeter. The pouch is configured to fully enclose the product space. The first wall comprises a first wall first layer having a machine direction shrinkage value of greater than 5% shrink at 90° C., a first wall second layer having a machine direction Gurley stiffness force of at least 800 mgf and a machine direction shrinkage value at 90° C. of less than the machine direction shrinkage value of the first wall first layer at 90° C., a first wall pattern connection, and a first wall air inlet. The first wall first layer is interior the first wall second layer. Various embodiments of the pouch are also described.

Abstract: Heat-seal condition indicating packages include a first sealing substrate comprising a leuco dye and a second sealing substrate comprising a leuco dye developer. The packages may optionally include a leuco dye sensitizer which dissolves both the leuco dye and the leuco dye developer when melted. The packages further include a heat-seal produced between the first sealing substrate and the second seating substrate. The heat-sea! comprises a reaction product of the leuco dye and the leuco dye developer. The reaction product may be colored, which may provide the heat-seal with a detectable optical characteristic. A magnitude of the optical characteristic may be proportion to the strength of the seal between the first and second seating substrates.

Abstract: A multilayer pouch with heat-shrinkable layer is described. The pouch comprises a first wall; a second wall; a perimeter comprising a first edge and a second edge opposing the first edge; and a product space positioned between the first wall, the second wall, and the perimeter. The pouch is configured to fully enclose the product space. The first wall comprises a first wall first layer having a machine direction shrinkage value of greater than 5% shrink at 90° C., a first wall second layer having a machine direction Gurley stiffness force of at least 800 mgf and a machine direction shrinkage value at 90° C. of less than the machine direction shrinkage value of the first wall first layer at 90° C., a first wall pattern connection, and a first wall air inlet. The first wall first layer is interior the first wall second layer. Various embodiments of the pouch are also described.

Abstract: A lidding film to use in food packaging, or the packaging of suitable non-food products, includes a substrate having an outer major surface on which is disposed at least a 5 heat-sealing layer (HS layer), a non-heat-sealing layer (NTIS layer), and a hydrophobic coating. On a side of the lidding film that corresponds to the outer major surface of the substrate is a peripheral region that encircles a central region. At least a first portion of the HS layer fills the peripheral region, and the NIS layer is absent as a cover on, or does not cover, the HIS layer in the peripheral region. At least a first portion of the NHS layer fills the 10 central region, and the HS layer is absent as a cover on, or does not cover, the NIS layer in the central region.

Abstract: The present invention is directed to heat-seal condition indicating packages having a first sealing substrate comprising a leuco dye and a second sealing substrate comprising a leuco dye developer, and a leuco dye sensitizer which dissolves both the leuco dye and the leuco dye developer when melted which is disposed in or on the surface of either the first or second sealing substrata or disposed in or on the surface of both the first and second sealing substrates. The packages of the present invention further include a heat-seal produced between the first sealing substrate and the second sealing substrate which comprises a heat-seal defect-free state which produces a visible color change within the heat-seal after heat sealing, and/or a heat-seal defect state which produces no visible color change within the heat-seal after heat sealing.