Hot melt application system
View Patent ↗Hot melt adhesive pellets are melted and pressure pumped in a controlled application pattern on the substrate at the application site. The high frequency power supply, induction heated melting susceptor, pressure pump, and pattern control electronics are all contained in a single unit within adhesive projection distance.
1. An apparatus for melting and delivering thermoplastic material consisting of:
a pervious susceptor shaped to receive palletized thermoplastic material and transmit heat by conduction to the material;
an inductor coil to shape a magnetic field that intercepts the pervious susceptor to create controlled resistive heat in the susceptor;
a high frequency power supply to power and control the inductor coil;
a pressure pump directly attached to an inductor coil support form;
a motor to provide controlled rotation to the pump; and
a current supply for the high frequency power supply and pump motor.
2. An apparatus according to claim 1 where the pressure pumping elements are the rotors of a gerotor pump.
3. An apparatus according to claim 1 where the heat susceptor is constructed of metal foam.
4. An apparatus according to claim 1 where the heat susceptor is constructed of perforated metal.
5. An apparatus for melting and delivering thermoplastic material consisting of:
a pervious susceptor shaped to receive pelletized thermoplastic material and transmit heat by conduction to the material;
an inductor coil to shape a magnetic field that intercepts the pervious susceptor to create controlled resistive heat in the susceptor;
a high frequency power supply to power and control the inductor coil;
pressure pumping elements placed in the same high frequency magnetic field to receive induced heat simultaneously from the same source;
a motor to provide controlled rotation to the pump elements and;
a current supply for the high frequency power supply and pump motor.
6. An apparatus according to claim 5 where a delivery orifice or orifices are positioned in a stationary containing element of the gerotor pump to receive heat from the magnetic field and minimize the delivery path volume.