Air curtain generating device

An air curtain generating device comprising:

• a plurality of pairs of an air jet unit and an air suction unit placed opposite each other on both sides in a lateral direction of an inlet/outlet of a drying chamber, the plurality of the pairs being aligned up and down, the air suction units sucking air ejected from the air jet units to generate an air curtain;
• a first air guide provided to the air jet units in an upper part of the inlet/outlet to guide air ejected from the air jet units in a direction inclined inward of the drying chamber relative to the lateral direction of the inlet/outlet;
• and
• a second air guide provided to the air jet units in a lower part of the inlet/outlet to guide air ejected from the air jet units in a direction inclined outward of the drying chamber relative to the lateral direction of the inlet/outlet, wherein:
• a plurality of air curtain generating sets are provided in multiple layers along a passing-through direction of the inlet/outlet, each air curtain generating set comprising the plurality of the pairs of the air jet unit and the air suction unit aligned up and down to generate multiple layers of the air curtains along the passing-through direction of the inlet/outlet,
• the air jet units of one of the air curtain generating sets adjacent each other and the air jet units of an other air curtain generating set are respectively placed on one side and an other side in the lateral direction of the inlet/outlet so that air flows of the multiple layers of the air curtains are oriented alternately opposite from each other,
• the first air guides are provided only to an innermost air curtain generating set of the multiple layers of the air curtain generating sets, and
• the second air guides are provided only to an outermost air curtain generating set of the multiple layers of the air curtain generating sets.

An air curtain generating device comprising:

• a plurality of pairs of an air jet unit and an air suction unit placed opposite each other on both sides in a lateral direction of an inlet/outlet of a drying chamber, the plurality of the pairs being aligned up and down, the air suction units sucking air ejected from the air jet units to generate an air curtain;
• a first air guide provided to the air jet units in an upper part of the inlet/outlet to guide air ejected from the air jet units in a direction inclined inward of the drying chamber relative to the lateral direction of the inlet/outlet;
• and
• a second air guide provided to the air jet units in a lower part of the inlet/outlet to guide air ejected from the air jet units in a direction inclined outward of the drying chamber relative to the lateral direction of the inlet/outlet, wherein:
• a plurality of air curtain generating sets are provided in multiple layers along a passing-through direction of the inlet/outlet, each air curtain generating set comprising the plurality of the pairs of the air jet unit and the air suction unit aligned up and down to generate multiple layers of the air curtains along the passing-through direction of the inlet/outlet,
• the air jet units of one of the air curtain generating sets adjacent each other and the air jet units of an other air curtain generating set are respectively placed on one side and an other side in the lateral direction of the inlet/outlet so that air flows of the multiple layers of the air curtains are oriented alternately opposite from each other, and
• the plurality of pairs of the air jet unit and the air suction unit are spaced apart in a range of from 600 mm to 2000 mm in the passing-through direction.