B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
93/60, 229/15.5
B65D 5/56 (2006.01) B65B 51/20 (2006.01)
Patent
CA 1099678
Abstract: A method of forming a heat-sealable car- ton (5) having a pair of mating surfaces (15,19) to be sealed includes the steps of coating at least one of the carton surfaces with a heat-activated thermo- setting adhesive (37), spraying a fine mist of a water-based adhesive (39) which exhibits high contact tackiness when dry to form a discontinuous film on the coated surface, heating the water-based adhesive coated surface to a temperature sufficient to dry the water based adhesive and activate the thermo- setting adhesive, placing the mating carton surfaces (15, 19) in contact with each other and applying pressure for a time sufficient to seal the contacting surfaces together. A carton (5) is provided with flaps (15, 19) sealed by the combination of thermo- setting heat-activated adhesive (37) and high tack water-based adhesive (39). This allows the mating surfaces (15, 19) to be rapidly sealed by automatic carton closing apparatus (1) and results in a sealed carton (5) which exhibits good seal integrity at high temperatures.
339811
Kliklok Corporation
Meredith & Finlayson
LandOfFree
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