Mold, method for manufacturing plate-shaped molded article, method for manufacturing test piece, and method for predicting characteristics of resin composition molded article

A mold for injection molding a plate-shaped molded article by using a molten material of a thermoplastic resin, the mold comprising:

• a runner section that has a slit gate section provided along a width direction of the plate-shaped molded article and is configured to fill a cavity with the molten material via the slit gate section, the molten material being injected via a sprue section, wherein
• the runner section divides the molten material from the sprue section, merges the divided molten materials in a portion along the slit gate section, and guides the merged molten material to the slit gate section,
• wherein in a merging area along the slit gate section, the divided molten materials are merged from both sides in a perpendicular direction to a flow direction in the cavity towards a center,
• wherein the runner section includes a first runner leg and a second runner leg, wherein the runner section divides the molten material from the sprue section into the first runner leg and the second runner leg, and wherein the merging area includes a first end and a second end positioned opposite the first end across the width direction of the plate shape molded article, wherein the merging area extends perpendicular to downstream portions of the first runner leg and the second runner leg, wherein the downstream portion of the first runner leg merges with the merging area at the first end of the merging area and the downstream portion of the second runner leg merges with the merging area at the second end of the merging area,
• wherein the slit gate section is positioned relative to the merging area so as to guide the molten material toward a center of the slit gate section.