130 when the powder grain material drops in the vinyl bag a predetermined quantity the vinyl bag 172 is closed by a heated bag closing piece 175 as shown in fig2 the vinyl bag is formed in such a manner that the intermediate portion of the vinyl cylinder in the shape of a cylinder supplied from the upper hand enclosing the powder grain material control unit is closed by the bag closing piece 175 the vinyl cylinder goes down being filled with the powder grain material by the powder grain material control unit and the upper portion rather than the intermediate portion is closed again by the bag closing piece 175 the filter cylinder 162 can be changed by detaching the screw 154 of the lower flange 144 and pulling the lower flange 144 and the filter layer 140 out of the upper flange 143 and the outside ring 146 besides the choking of the filter may be solved by entering highly pressured air from the suction cap 142 and its maintenance is easy furthermore the above mentioned powder grain material filling unit 120 has the drop guide cylinder 125 and the auger 127 having almost the same length as one of this drop guide cylinder 125 but as a powder grain material filling unit 220 as shown in fig9 the drop guide cylinder may be omitted the length of an auger 227 may be made short and a roll of a blade 229 having spiral shape may be formed besides it is not always necessary to enter the lower end of the augers 127 227 of the powder grain material filling units 120 220 in the above mentioned two embodiments in.