Method for attaching labels to items
AssigneeUpm Raflatac Oy
InventorsKati Metsäjoki, Noel Mitchell
Life of this patent
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Abstract
A method for attaching a label to a surface of an item. The label includes a carrier layer and a bonding layer. The method includes heating the bonding layer using infrared light such that the infrared light has a maximum spectral irradiance at a peak wavelength. The bonding layer has an absorbing spectral region that spectrally matches with the peak wavelength.
Claims20
A method for attaching a label to a surface of an item, the label comprising a carrier layer and a bonding layer, wherein the bonding layer comprises an acrylic adhesive, the method comprising:
- heating the bonding layer using infrared light such that the infrared light has a spectral peak and a maximum spectral irradiance at a peak wavelength of the spectral peak, wherein the acrylic adhesive has an absorbing spectral region that substantially matches with said peak wavelength, such that the absorbing spectral region spectrally overlaps at least 50% of a full-width-at-half-maximum width of the spectral peak, and wherein the absorbing spectral region is at wavelengths equal to or greater than 3 μm.
The method according to claim1, wherein a maximum spectral irradiance is at a wavelength where a spectral absorbance of the bonding layer is substantially higher than a spectral absorbance of the carrier layer, such that the carrier layer is heated less than the bonding layer.
A method for attaching a label to a surface of an item, the label comprising a carrier layer and a bonding layer, the bonding layer comprising polyurethane adhesive, the method comprising:
- heating the bonding layer using infrared light such that the infrared light has a spectral peak and a maximum spectral irradiance at a peak wavelength of the spectral peak that substantially matches with an absorbing spectral region of the polyurethane adhesive, wherein the absorbing spectral region spectrally overlaps at least 50% of a full-width-at-half-maximum width of the spectral peak, and wherein the absorbing spectral region is at wavelengths equal to or greater than 3 μm.
Dependencies are inferred from the claim text.