Liquid storage container, manufacturing method of liquid storage container, and liquid ejection apparatus

A manufacturing method of a liquid storage container, wherein

• the liquid storage container comprises a liquid storage part that stores liquid and a liquid supply unit part that is attached to the liquid storage part,
• the liquid storage part has a first face and a second face,
• the liquid supply unit part comprises a liquid suction part and a liquid supply part,
• the liquid supply part has a first slope and a second slope inclined in opposite directions to each other on a side of the first face and a third slope and a fourth slope inclined in opposite directions to each other on a side of the second face, and at least one of an angle formed by the first slope and the third slope and an angle formed by the second slope and the fourth slope is an angle A,
• the liquid suction part has a fifth slope and a sixth slope inclined in opposite directions to each other on the side of the first face and a seventh slope and an eighth slope inclined in opposite directions to each other on the side of the second face, and at least one of an angle formed by the fifth slope and the seventh slope and an angle formed by the sixth slope and the eighth slope is an angle B, and
• an angle ratio (B/A) of the angle B to the angle A is greater than or equal to 0.8 and less than or equal to 1.1, and
• the manufacturing method comprises
• a first welding step and a second welding step for welding the liquid supply unit part to the liquid storage part,
• the first welding step comprises a step of inserting the liquid supply unit part into an opening of the liquid storage part, and welding the liquid storage part and the liquid supply unit part together, and
• the second welding step comprises a step of welding an unwelded portion of the opening of the liquid storage part.

A liquid ejection apparatus comprising a liquid ejection head and a liquid delivery unit that delivers liquid to the liquid ejection head, the liquid delivery unit comprising

• a liquid storage container comprising a liquid storage part that stores liquid and a liquid supply unit part that is attached to the liquid storage part, wherein
• the liquid storage part has a first face and a second face,
• the liquid supply unit part comprises a liquid suction part and a liquid supply part,
• the liquid supply part has a first slope and a second slope inclined in opposite directions to each other on a side of the first face and a third slope and a fourth slope inclined in opposite directions to each other on a side of the second face, and at least one of an angle formed by the first slope and the third slope and an angle formed by the second slope and the fourth slope is an angle A,
• the liquid suction part has a fifth slope and a sixth slope inclined in opposite directions to each other on the side of the first face and a seventh slope and an eighth slope inclined in opposite directions to each other on the side of the second face, and at least one of an angle formed by the fifth slope and the seventh slope and an angle formed by the sixth slope and the eighth slope is an angle B, and
• an angle ratio (B/A) of the angle B to the angle A is greater than or equal to 0.8 and less than or equal to 1.1.