Method of screen printing with hot melt foam compositions
AssigneeNordson Corporation
InventorWalter H. Cobbs, Jr.
Life of this patent
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Abstract
The method of screen printing with a hot melt foam composition includes providing a screen having the desired pattern to be transferred to a substrate, casting onto the screen a hot melt foam composition and forcing the foam composition through the screen to form the described pattern on the substrate. The method offers a number of advantages including the transfer of large amounts of hot melt inks through the screen, fast printing speeds, printing with highly viscous polymeric or thermosetting materials and control of processing temperatures, among other advantages.
Claims10
A method of hot melt screen printing a pattern onto a substrate comprising
- providing a screen having a desired pattern of porous and nonporous areas adjacent the substrate,
- heating a nonaqueous thermoplastic to form a hot melt composition of molten thermoplastic,
- foaming said hot melt composition by introducing a gas to form a hot melt foam composition having a lower viscosity and higher heat retention than the unfoamed hot melt composition,
- coating onto said screen the hot melt foam composition, and
- forcing the hot melt foam composition through the porous areas of the screen to form the desired pattern of the composition on the substrate.
Dependencies are inferred from the claim text.