Coarse crushing device and fiber treatment apparatus

A coarse crushing device comprising:

• a rotary cutter portion including
• a first rotating shaft member rotating about a first axis,
• a second rotating shaft member rotating reversely to the first rotating shaft member about a second axis parallel to the first axis,
• a plurality of first rotary cutters provided on the first rotating shaft member and rotating together with the first rotating shaft member,
• a plurality of second rotary cutters provided on the second rotating shaft member and rotating together with the second rotating shaft member, and
• a first liquid supply portion supplying a liquid to the first rotary cutters,
• one second rotary cutter of the second rotary cutters being located between two adjacent first rotary cutters of the first rotary cutters and being separated and spaced apart from both of the two adjacent first rotary cutters, the adjacent first rotary cutters being adjacent to each other,
• one first rotary cutter of the first rotary cutters being located between two adjacent second rotary cutters of the second rotary cutters and being separated and spaced apart from both of the two adjacent second rotary cutters, the adjacent second rotary cutters being adjacent to each other, and
• the first rotary cutters and the second rotary cutters being separated from each other,
• the first rotary cutter and the second rotary cutter tearing off a fiber-containing sheet in a first direction;
• a roller portion pinching the fiber-containing sheet;
• a tearing portion provided between the rotary cutter portion and the roller portion, and having a plurality of blades tearing off the fiber-containing sheet in a second direction intersecting the first direction;
• and
• a second liquid supply portion supplying a liquid to the blade, wherein
• the roller portion includes a first roller and a second roller rotating in directions opposite to each other, the first roller rotates about a third axis parallel to the first axis, the second roller rotates about a fourth axis parallel to the first axis,
• the first axis, the second axis, the third axis, and the fourth axis extend in an axial direction,
• at least a part of the blades of the tearing portion crosses a first virtual straight line as viewed in the axial direction, when tearing off the fiber-containing sheet in the second direction, the first virtual straight line couples a first middle point to a second middle point, the first middle point is positioned at a middle point between the first axis and the second axis and positioned on a second virtual straight line extending from the first axis to the second axis in a perpendicular direction perpendicular to the axial direction, and the second middle point is positioned at a middle point between the third axis and the fourth axis and positioned on a third virtual straight line extending from the third axis to the fourth axis in the perpendicular direction, and
• the tearing portion tears off the fiber-containing sheet when the fiber-containing sheet is pinched by the roller portion.