Thermal barrier for hot glue adhesive dispenser

DETAILED DESCRIPTION OF THE INVENTION Referring now to the drawings wherein the showings are for purposes of illustrating a preferred embodiment of the invention only and not for purposes of limiting the same, FIG.
1 shows an adhesive dispensing device 10 which includes a dispensing module 11 having a gun body 12.
The gun body 12 has a nozzle 14, an adhesive manifold 16 mounted to the gun body 12 and an air manifold 17 mounted to the gun body 12.
The gun body 12 is mounted to the adhesive manifold 16 by mounting bolts 64.
The adhesive manifold 16 may be supported on a bar 66 by mounting blocks 68 connected to the adhesive manifold 16 with screws 70.
The air manifold 17 is mounted to the adhesive manifold 16 by two or more screws 19, each of which extend through a spacer 21 extending between the adhesive and air manifolds 16,17.
The nozzle 14 dispenses a bead of heated hot melt adhesive onto a substrate (not shown), such as a carton or box.
The structure of the gun body 12 and manifolds 16,17 are substantially identical to the Model H200 gun manufactured and sold by the assignee of this invention, Nordson Corporation of Amherst, Ohio.
This configuration of an adhesive dispensing device is known in the art and is discussed in detail in U.
S.
Pat.
No.
4,785,996 to Ziecker et al.
and U.
S.
Pat.
No.
4,969,602 to Scholl, the disclosures of which are incorporated herein by reference in their entirety.
The adhesive manifold 16 is formed with a junction box 76 which receives an electric cable 78 to supply power to a heater 80 and a resistance temperature device (hereinafter "RTD") 82.
The RTD 82 senses the temperature of the manifold 16 near the RTD and provides feedback control to the heater 80.
The heater 80 generates heat and maintains the hot melt adhesive in a molten state when it is introduced into the adhesive manifold 16 through an adhesive inlet line 84 from an external source of hot melt adhesive (not shown).
The adhesive inlet line 84 communicates through a fluid passageway 86 formed in the gun body 12 with the adhesive cavity 46