Application method and products that use a foamed hot melt adhesive
First Claim
1. A method of applying a foamable hot melt adhesive to a first substrate for adhering said first substrate to a second substrate, comprising:
- ejecting a foamable hot melt adhesive from the discharge orifice of a nozzle, and impacting said foamable hot melt adhesive ejected from said nozzle with heated air;
controlling the flow rates of said foamable hot melt adhesive and said heated air, and controlling the temperature of said heated air, so as to form elongated strands of foamed hot melt adhesive;
depositing said elongated strands of foamed hot melt adhesive onto said first substrate so that said elongated strands form an open weave film having a spider web like configuration; and
thereafter bonding said second substrate to said first substrate.
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Abstract
A method that includes the step of spraying a foamed hot melt adhesive from the discharge nozzle of a spray gun under such conditions that elongated strands of foamed hot melt adhesive are formed in an open weave film of spider web configuration which is deposited on a first substrate. A second substrate can then be bonded to the first to form a product. Alternatively, and before the second substrate is bonded to the first, a powder, e.g., a hygroscopic powder, can be deposited within the open areas of the film'"'"'s spider web configuration to form a laminate product with a special enhanced characteristic, e.g., moisture absorbency.
133 Citations
9 Claims
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1. A method of applying a foamable hot melt adhesive to a first substrate for adhering said first substrate to a second substrate, comprising:
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ejecting a foamable hot melt adhesive from the discharge orifice of a nozzle, and impacting said foamable hot melt adhesive ejected from said nozzle with heated air; controlling the flow rates of said foamable hot melt adhesive and said heated air, and controlling the temperature of said heated air, so as to form elongated strands of foamed hot melt adhesive; depositing said elongated strands of foamed hot melt adhesive onto said first substrate so that said elongated strands form an open weave film having a spider web like configuration; and thereafter bonding said second substrate to said first substrate. - View Dependent Claims (2, 3)
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4. A laminated product comprising:
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a first substrate; a foamable hot melt adhesive ejected from the discharge orifice of a nozzle at a controlled flow rate and impacted by a stream of atomizing air having a controlled temperature and a controlled flow rate to form elongated strands of foamed hot melt adhesive, said strands of foamed hot melt adhesive being applied to a surface of said first substrate in a film having a spider web like configuration when initially applied to said first substrate, the spider web like configuration defining open spaces between said elongated strands that cooperate to provide an open mesh hot melt adhesive foam film on said surface, and a second substrate bonded to said first substrate by said open mesh hot melt adhesive foam film. - View Dependent Claims (5, 6, 7, 8, 9)
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Specification