Pump for melted thermoplastic materials

A pump for melted thermoplastic (10) comprising:

• a cold section (12) including a top portion (30) and a bottom portion (36) secured together, the cold section having an input (82) to through shafts (22, 24), said through shafts (22, 24) intermeshed, in a space between said top portion (30) and said bottom portion (36) of said cold section, to rotate in opposite directions and having an extended length extending out of a bottom portion of said cold section (12) to a hot section (14);
• such that each of said through shafts (22, 24) extends outwardly from said cold section (12) to provide rotation to a rotary portion of said hot section (14),
• at least one separating pillar (16) extending between a bottom surface (42) of said bottom portion (36) of said cold section (12) and a top surface (44) of said hot section (14), thus spacing said cold section (12) from the hot section (14) providing an air gap there between;
• said hot section (14) including intermeshing lobes (62, 64) counter-rotated by said through shafts (22, 24) to provide positive transfer of a melted thermoplastic;
• a heating jacket (18) covering a portion of said hot section (14) for heating said hot section (14);
• and a drive motor (20) for driving said single rotary input of said cold section (12).

A method of constructing a pump for melted thermoplastic (10) comprising:

• providing a cold section (12) including a top portion (30) and a bottom portion (36) secured together, the cold section having an input (82) to through shafts (22, 24), said through shafts (22, 24) intermeshed, in a space between said top portion (30) and said bottom portion (36) of said cold section, to rotate in opposite directions and having an extended length extending out of the bottom portion of said cold section (12) to a hot section (14);
• providing at least one separating pillar (16) extending between a bottom surface (42) of said bottom portion (36) of said cold section (12) and a top surface (44) of said hot section (14) for providing spacing between said cold section (12) and said hot section (14);
• connecting a drive motor (20) to said input (82) of said cold section (12) for driving said pump for melted thermoplastic (10) such that said through shafts (22, 24) extends rotational motion from said cold section (12) to said hot section (14) from said drive motor (20) for transfer of melted thermoplastic, said hot section (14) including two intermeshing Roots type lobes (62, 64) connected to a distal end of said through shafts (22, 24) for positive transfer of said melted thermoplastic;
• connecting a heating jacket (18) to said hot section (14) for heating said hot section (14) of said pump for melted thermoplastic (10).