Abstract: A gold alloy and a method for producing the gold alloy. The gold alloy includes: gold; and an Au—X-RE-based hypermaterial represented by a compositional formula AU100-(a+b)XaREb, wherein, in the compositional formula, X represents at least one atom selected from the group consisting of Al, Ga, In, Si, Ge, and Sn; RE represents a rare-earth element; and a and b respectively represent a content of X and a content of RE, expressed in at %, and satisfy the following (1) and (2): 10?a?40 (1); and 13?b?17 (2), wherein the Au—X-RE-based hypermaterial is dispersed in a gold matrix phase.

Abstract: A sheet manufacturing method includes a conveying step of conveying a base material sheet; and a processing step of rotating a pair of processing rolls to sandwich a conveyance path on which the base material sheet is conveyed, wherein irregular portions along respective outer peripheral faces of the processing rolls engage with each other with a clearance to stretch the base material sheet when the base material sheet passes between the processing rolls. In the conveying step, the base material sheet is conveyed such that the base material sheet contacts along the outer peripheral face of one of the processing rolls immediately prior to passing between the processing rolls; and the tension in the conveyance direction applied to the base material sheet immediately prior to reaching the outer peripheral face of the one of the processing rolls is less than 10% of a breaking load of the base material sheet.

Abstract: Provided is a manufacturing apparatus for manufacturing a composite stretchable member capable of improving a function of preventing cutting by reducing a defect in which an elastic member is detached from a groove of a conveying roller. The manufacturing apparatus includes a guide device that guides the two sheets and the elastic members to a bonding device. The guide device includes a guide member that guides the elastic members to respective multiple grooves on an outer peripheral surface of a conveying roller of the bonding device. The guide member is provided at its leading end with multiple guide grooves for holding the corresponding elastic members. The guide member is disposed to allow the elastic members positioned between the guide grooves and the corresponding grooves of the conveying roller to each have a length of 30 mm or less.