Apparatus for spraying heat responsive materials

Apparatus for spraying heat responsive materials from a source, said apparatus comprising:

• a source of compressed gas;
• an elongated housing having inlet means at one end thereof for receiving compressed gas and the material to be sprayed from said sources and outlet means at the other end thereof for discharging a mixture of the compressed gas in a heated condition together with the material to be sprayed;
• first passageway means in said housing in fluid communication with the source of compressed gas and with said outlet means, said first passageway means defining a serpentine path for a first portion of the compressed gas;
• means for heating the first portion of the compressed gas in one leg of said serpentine path prior to the discharge thereof;
• nozzle means to spray the material therefrom positioned radially inward of said heating means;
• means for coupling said nozzle to the source of the material to be sprayed therefrom;
• second passageway means for receiving a second portion of the compressed air or inert gas, said second passageway means being arranged to direct a film of compressed gas over the surface of said nozzle means to thereby entrain the material to be sprayed in the second portion of the compressed gas prior to the mixture thereof with the heated, first portion of the compressed gas and subsequent discharge of the heated mixture from said outlet means;
• and
• baffle means surrounding said nozzle means to prevent the mixing of said heated first portion of the compressed gas with said material-entrained second portion until the latter is downstream of said nozzle means.

An apparatus for spraying heat responsive resin materials comprising:

• a pressurized source of heat responsive resin materials;
• a source of compressed fluid;
• a body;
• a passage in said body connected with said pressurized source of material to receive the same and a nozzle to spray the same from said body,
• inlet means on said body connected with said source of compressed fluid to direct the flow of one portion of the fluid through said body initially to cool the outer portion thereof and to direct the flow of another portion of the fluid through said body to cool said passage,
• heating means in said body to heat the one portion of fluid during its flow,
• and means on said body directing each of said portions of fluid downstream of said nozzle, said means directing said heated portion of the fluid to heat the resin material and directing said other portion of the fluid so as to prevent the heating of the resin material by said heated portion until the resin material is downstream of said nozzle.