A composite foam cushion for a sound control device. The cushion includes a core formed of a polymeric foam material and a polymeric coating overlying at least a portion of the core of polymeric foam material. The polymeric coating includes an outer coating layer and an inner polymeric coating layer bonded to the core of polymeric foam material. The inner coating layer may provide the cushion with strength, while providing a high degree of flexibility and suppleness to closely conform around contours and obstructions. The outer coating layer may provide the cushion with enhanced abrasion resistance and/or chemical resistance while having an aesthetically pleasing feel and appearance.

A slide part has a surface structure in which there are at least two periodic structures among a first periodic structure with a period of 10 nm to 100 nm inclusive and a depth of 5 nm to 50 nm inclusive, a second periodic structure with a period of 100 nm to 1000 nm inclusive and a depth of 20 nm to 500 nm inclusive, and a third periodic structure with a period of 1000 nm to 10000 nm inclusive and a depth of 100 nm to 3000 nm inclusive, in which one of the at least two periodic structures is formed on the other periodic structure.

A slide part has a surface structure in which there are at least two periodic structures among a first periodic structure with a period of 10 nm to 100 nm inclusive and a depth of 5 nm to 50 nm inclusive, a second periodic structure with a period of 100 nm to 1000 nm inclusive and a depth of 20 nm to 500 nm inclusive, and a third periodic structure with a period of 1000 nm to 10000 nm inclusive and a depth of 100 nm to 3000 nm inclusive, in which one of the at least two periodic structures is formed on the other periodic structure.

A slide part has a surface structure in which there are at least two periodic structures among a first periodic structure with a period of 10 nm to 100 nm inclusive and a depth of 5 nm to 50 nm inclusive, a second periodic structure with a period of 100 nm to 1000 nm inclusive and a depth of 20 nm to 500 nm inclusive, and a third periodic structure with a period of 1000 nm to 10000 nm inclusive and a depth of 100 nm to 3000 nm inclusive, in which one of the at least two periodic structures is formed on the other periodic structure.

The purpose of this disclosure is to provide a process for producing stretch nonwoven fabric having excellent stretchability. This production process has the following configuration. The process for producing stretch nonwoven fabric comprises: a step in which nonwoven fabric to be treated which comprises stretchable fibers and extensible fibers is unevenly stretched, while being conveyed, so that nonwoven fabric having both higher stretched regions and lower stretched regions is formed; and a step in which the nonwoven fabric having both higher stretched regions and lower stretched regions is heated for 0.1-10 seconds at a temperature which is 40 C. or higher but is lower than the melting point of the stretchable fibers. The production process is characterized in that in the nonwoven fabric having both higher stretched regions and lower stretched regions, the higher stretched regions and the lower stretched regions are parallel to the direction perpendicular to the conveying direction and are present alternately in the conveying direction.