To provide a box-type vessel capable of maintaining an acid treatment liquid to a prescribed pH value.SOLUTION: Provided is a box-type vessel which includes an acid treatment tank for storing an acid treatment liquid; and a pair of takeup rolls provided inside the acid treatment tank for taking up a laver net with attached laver. The box-type vessel includes: a pH sensor which is provided in the acid treatment tank for detecting pH of the acid treatment liquid; an undiluted liquid discharge part for discharging an undiluted acid liquid, which is provided at a position not interfering with the laver net taken up by the takeup rolls; and an undiluted liquid feeder which automatically adjusts a feeding amount of the undiluted acid liquid fed to the undiluted liquid discharge part based on the detection value of the pH sensor. The undiluted liquid discharge part is provided on an entering side of the laver net in the acid treatment tank.SELECTED DRAWING: Figure 3
箱型船
2022-01-21
Patent
Elektronische Ressource
Japanisch