Powder container and image forming apparatus

A container comprising:

• a bottle body configured to accommodate powder,
• wherein the bottle body has, at one end, an opening configured to allow the powder to flow out,
• wherein the bottle body is positioned with the opening facing laterally,
• wherein the bottle body is rotatable about a rotation center line extending laterally through a center of the opening,
• wherein the bottle body comprises an inner peripheral surface on which a spiral protrusion is formed,
• wherein the spiral protrusion is configured to transport the accommodated powder toward the opening if the bottle body is rotated about the rotation center line,
• wherein if the bottle body is sectioned vertically on a plane including the rotation center line, the spiral protrusion causes a plurality of upwardly protruding projections to appear on a cross-section,
• wherein the bottle body has a tapered portion on a side close to the opening,
• wherein the tapered portion decreases in diameter toward the opening,
• wherein the projections in the tapered portion each have an opening-facing face and a face facing opposite to the opening, and
• wherein the opening-facing face rises more steeply than the face facing opposite to the opening.

A container comprising:

• a bottle body configured to accommodate powder,
• wherein the bottle body has, at one end, an opening configured to allow the powder to flow out,
• wherein the bottle body is positioned with the opening facing laterally,
• wherein the bottle body is rotatable about a rotation center line extending laterally through a center of the opening,
• wherein the bottle body comprises an inner peripheral surface on which a spiral protrusion is formed,
• wherein the spiral protrusion is configured to transport the accommodated powder toward the opening if the bottle body is rotated about the rotation center line,
• wherein if the bottle body is sectioned vertically on a plane including the rotation center line, the spiral protrusion causes a plurality of upwardly protruding projections to appear on a cross-section,
• wherein on the cross-section, a bottom of the inner peripheral surface forms a slope rising toward the opening,
• wherein the projections appearing on the slope each have an opening-facing face and a face facing opposite to the opening,
• wherein the projections appearing on the slope include a first projection and a second projection closer to the opening than the first projection, and
• wherein a height from the bottom of the opening-facing face to a top of the second projection is lower than the height of the first projection.