Metal plate and method for manufacturing the same, and method for manufacturing metal mask

A metal plate which is elongated and is to be used for manufacturing a metal mask, wherein

• when a differential expansion rate En in a unit length L0 in a longitudinal direction for an arbitrary position n in a width direction of the metal plate is measured at each of a plurality of positions in the longitudinal direction,
• a difference in the differential expansion rate En in a central portion in the width direction is 9.0×10−6 or less at a plurality of the positions,
• the central portion is a portion that occupies 80% in the width direction of the metal plate excluding both side portions that occupy 10% in the width direction, and
• the plurality of the positions include both end portions in the longitudinal direction of the metal plate and a portion that internally divides the metal plate in the longitudinal direction into one or more portions.

A method for manufacturing a metal plate which is elongated and is to be used for manufacturing a metal mask, comprising

• a rolling step of rolling a base material to obtain the metal plate which is elongated, wherein
• in the metal plate,
• when a differential expansion rate En in a unit length L0 in a longitudinal direction for an arbitrary position n in a width direction of the metal plate is measured at each of an arbitrary plurality of positions in the longitudinal direction,
• a difference in the differential expansion rate En in a central portion in the width direction is 9.0×10−6 or less at a plurality of the positions, and
• the central portion is a portion that occupies 80% in the width direction of the metal plate excluding both side portions that occupy 10% in the width direction.

A method for manufacturing a metal plate which is elongated and is to be used for manufacturing a metal mask, comprising

• a rolling step of rolling a base material to obtain the metal plate which is elongated, wherein
• in the metal plate,
• when a differential expansion rate En in a unit length L0 in a longitudinal direction for an arbitrary position n in a width direction of the metal plate is measured at each of a plurality of positions in the longitudinal direction,
• a difference in the differential expansion rate En in a central portion in the width direction is 9.0×10−6 or less at a plurality of the positions,
• the central portion is a portion that occupies 80% in the width direction of the metal plate excluding both side portions that occupy 10% in the width direction, and
• the plurality of the positions include both end portions in the longitudinal direction of the metal plate and a portion that internally divides the metal plate in the longitudinal direction into one or more portions.

A method for manufacturing a metal mask, comprising:

• a rolling step of rolling a base material to prepare a metal plate which is elongated;
• and
• an etching step of etching the metal plate to form the metal mask, wherein
• in the metal plate,
• when a differential expansion rate En in a unit length L0 in a longitudinal direction for an arbitrary position n in a width direction of the metal plate is measured at each of an arbitrary plurality of positions in the longitudinal direction,
• a difference in the differential expansion rate En in a central portion in the width direction is 9.0×10−6 or less at a plurality of the positions, and
• the central portion is a portion that occupies 80% in the width direction of the metal plate excluding both side portions that occupy 10% in the width direction.

A method for manufacturing a metal mask, comprising:

• a rolling step of rolling a base material to prepare a metal plate which is elongated;
• and
• an etching step of etching the metal plate to form the metal mask, wherein in the metal plate,
• when a differential expansion rate En in a unit length L0 in a longitudinal direction for an arbitrary position n in a width direction of the metal plate is measured at each of a plurality of positions in the longitudinal direction,
• a difference in the differential expansion rate En in a central portion in the width direction is 9.0×10−6 or less at a plurality of the positions,
• the central portion is a portion that occupies 80% in the width direction of the metal plate excluding both side portions that occupy 10% in the width direction, and
• the plurality of the positions include both end portions in the longitudinal direction of the metal plate and a portion that internally divides the metal plate in the longitudinal direction into one or more portions.