Method of and apparatus for producing asphalt saturated fiberboard

Apparatus for impregnating saturable members within asphalt or the like comprising:

• an upright tank having a bottom, front, rear and end walls;
• a cover for said tank which is sealable thereto;
• a lower connection for supplying a solution of asphalt and solvent to the interior of said tank;
• a rack having an open framework for supporting a series of said members in laterally spaced, upright position;
• heating means within said tank, through which a heating medium may be circulated, including at least one elongated heater mounted inside said tank on the bottom and on which said rack is placed for treatment of said members;
• an upper connection for applying suction to the interior of said tank;
• means for condensing solvent vapor withdrawn from said tank through said upper connection;
• and
• a vacuum pump connected to said means for condensing solvent vapor.

Apparatus for impregnating saturable members with asphalt or the like, comprising:

• an upright tank having a bottom, front, rear and end walls;
• a cover for said tank which is sealable thereto;
• a lower connection for supplying a solution of asphalt and solvent to the interior of said tank;
• means for supporting said members in upright position for treatment;
• means for supplying heat to the interior of said tank;
• an upper connection for applying suction to the interior of said tank;
• a vacuum pump for producing suction;
• and
• a pair of condensers, each having a lower condensate section, in series between said upper connection and said vacuum pump.

Apparatus for impregnating saturable members with asphalt or the like, comprising:

• an upright tank having a bottom, front, rear and end walls;
• a cover for said tank which is sealable thereto;
• a lower connection for supplying a solution of asphalt and solvent to the interior of said tank;
• means for supporting said members in upright position for treatment;
• means for supplying heat to the interior of said tank;
• an upper connection for supplying suction to the interior or said tank;
• a vacuum pump for producing suction;
• a condenser having an upper inlet section, an intermediate cooling section and a lower condensate section, whose inlet section is connected with said upper suction connection and the upper portion of whose condensate section is connected with said vacuum pump;
• an auxiliary tank having a volume at least equivalent to said condensate section of said condenser;
• and
• piping connecting said auxiliary tank with said condensate section of said condenser.

Apparatus for impregnating saturable members with asphalt and the like, comprising:

• an upright tank having a bottom, front, rear and end walls;
• a cover for said tank which is sealable thereto;
• a lower connection for supplying a solution of asphalt and solvent to the interior of said tank;
• means for supporting said members for treatment;
• means for supplying heat to the interior of said tank;
• an upper connection for applying suction to the inerior of said tank;
• means for condensing solvent vapor withdrawn from said tank through said upper connection;
• a vacuum pump connected by a pipe to said means for condensing solvent vapor;
• and
• a valve controlled pipe, at one end open to the atmosphere and at the opposite end connected to the pipe connecting said vacuum pump and said condensing means.