Fig. 26.
Fig. 27.
Fig. 28.
In section A, in front of blower D, is placed a steam or other heating device, G, which may be of any form or design adapted to allow the air from blower D to pass through it and to heat such air while passing therethrough. The inventor prefers the radiating coil for such purpose, the steam entering at b, and emerging at c. At the other end of the alley, which by the double construction is in section B, just back of the blower and heating-coil, there is placed a condensing-coil, H, of a construction similar to coil G, and having inlet d, and outlet e. Through this condenser there is kept flowing a refrigerating liquid or brine, which renders the condenser very cold. The continuous current of air from the blower passes over the contents of the cars or trays in the alley and takes up moisture in its passage. After such passage the air is charged with moisture and comes in contact with the coils of the condenser H, upon which the charge of moisture is condensed, and the air emerges dry again, enters the blower, and is again made the vehicle by which the moisture of the glue or other contents is transported to and deposited on the condenser.
In drying glue by this method do not use the steam-coil at the first stage of drying a charge, as the drying should not be effected too rapidly; but as soon as the product begins to stiffen properly, admit the steam to the coil G, and thereafter the operation is continuous, as above described.
By doubling up the alley into two sections, as shown, the inventor is enabled to erect the alley in a more contracted space. In a length of ninety feet he obtains the benefit of a single alley one hundred and eighty feet long. Section B may, if desired, be located on top of section A. Doors may be located wherever desired, to facilitate the movement of the trays or cars and the placing of them in and their removal from the alley.
Fig. 29.