Process for bonding two substrates together with the aid of a heat-activated thermoplastic adhesive and apparatus for making use of this process

The solid adhesive is placed in a tank (15) in which it melts to form a reserve of melt. The latter descends the walls (34, 35) of the tank towards the inlet (20) of a pump (16). A gas is transmitted at a pressure slightly above atmospheric pressure by a conduit (21) towards the air inlet. The liqui...

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Bibliographische Detailangaben
Hauptverfasser:	CHARLES H. SCHOLL, DUANE O. SHUSTER, WILLIAM C. STUMPHAUZER, JOHN R. JANNER, JR
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORY MACHINES OR APPARATUS ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE ADHESIVES AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING APPARATUS FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL BASIC ELECTRIC ELEMENTS CHEMISTRY COMPOSITIONS BASED THEREON DYES ELECTRICITY GENERAL PROCESSES OF COMPOUNDING INDUCTANCES MAGNETS MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNERANALOGOUS TO PAPER MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN AMANNER ANALOGOUS TO PAPER METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NAILING OR STAPLING MACHINES IN GENERAL NATURAL RESINS NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PERFORMING OPERATIONS POLISHES SAFETY DEVICES, e.g. THOSE FOR SAWS SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SPRAYING OR ATOMISING IN GENERAL THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSFORMERS TRANSPORTING USE OF MATERIALS AS ADHESIVES WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUSTO PAPER WORKING-UP
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Beschreibung
Zusammenfassung:	The solid adhesive is placed in a tank (15) in which it melts to form a reserve of melt. The latter descends the walls (34, 35) of the tank towards the inlet (20) of a pump (16). A gas is transmitted at a pressure slightly above atmospheric pressure by a conduit (21) towards the air inlet. The liquid and the gas which enter simultaneously are mixed in the pump (16) and expelled under pressure into a conduit (22). The solution formed then passes through a filter (18), conduits (23) and a pipe (25) towards a dispenser gun at the outlet of which the solution forms a foam containing minuscule gas bubbles in the liquid. The bubbles grow and multiply when the stream moves away from the nozzle. Even after deposition on a substrate the beads continue to grow. This foam retains adhesiveness characteristics which are superior to those of the same adhesive when dispensed under the same conditions but without bubbles in the liquid.