Patent ID: 7975429

Claim:
An apparatus for producing seedlings without requiring a waterproof structure from seedling culture to welding, so as to make acclimatization unnecessary and accelerate a growth of the seedlings, the apparatus comprising: a closed-type structure surrounded by light-interceptive thermally insulating walls; multi-staged seedling culture shelves provided with a plurality of shelf boards capable of mounting grafted seedlings thereon, said seedling culture shelves being disposed within said closed-type structure; a plurality of artificial lighting devices capable of projecting light onto the grafted seedlings and a plurality of fans capable of generating an air stream over each of said seedling culture shelves, a respective artificial lighting device of said plurality of artificial lighting devices and a respective fan of said plurality of fans being installed on each of said seedling culture shelves; an air conditioning unit capable of controlling a temperature and a humidity within said closed-type structure; a carbon dioxide gas supply unit capable of supplying carbon dioxide gas into said closed-type structure; and a light-transmitting shield detachably disposed to cover the grafted seedlings mounted on each of said plurality shelf boards of said seedling culture shelves, wherein said light-transmitting shield includes a plurality of vent holes, wherein each of said plurality of vent holes includes a means for varying an open area of the vent hole thereof, wherein said light-transmitting shield includes two side faces that are parallel to a direction of a flow of the air stream, wherein said two side faces are opposing and non-adjacent side faces of said light-transmitting shield, and wherein said plurality of vent holes are formed only in said two side faces of said light-transmitting shield to generate a static pressure from the flow of the air stream, such that said plurality of vent holes are formed only in the opposing and non-adjacent side faces of said light-transmitting shield, and such that the static pressure provides a gas exchange between an inner space of the closed-type structure and an inner space of said light-transmitting shield, so as to make the acclimatization unnecessary during the welding of the seedlings.