The present invention discloses a rubber composition comprising, in parts by weight, 100 parts of a rubber matrix, 1.5 to 9 parts of a crosslinking agent, 0.2 to 9 parts of an assistant crosslinking agent, 40 to 170 parts of a reinforcing filler, 6 to 93 parts of a plasticizer and 3 to 25 parts of a metal oxide. The rubber matrix comprises a branched polyethylene with a content represented as A, in which 0<A100 parts, an EPM with a content represented as B, in which 0B<100 parts, and an EPDM with a content represented as C, in which 0C<100 parts. The present invention provides a rubber composition which is excellent in heat resistance and mechanical properties and is useful in a cover rubber of a conveyor belt.

Flat belt apparatuses and methods are provided where one or more cords in the flat belt are tensioned or pre-tensioned to extend the service life of the flat belt.

Flat belt apparatuses and methods are provided where one or more cords in the flat belt are tensioned or pre-tensioned to extend the service life of the flat belt.

A rubber crawler (10) includes an endless rubber elastic body and protruding lugs (11) formed on the outer peripheral surface at a predetermined pitch in the crawler peripheral direction. Minute protrusions (14) extending in a direction intersecting the crawler width direction when viewed from the crawler peripheral direction are formed on a first side surface (12a) and a second side surface (12b) of the lugs (11), the side surfaces (12a, 12b) facing the crawler peripheral direction.

A rubber crawler (10) includes an endless rubber elastic body and protruding lugs (11) formed on the outer peripheral surface at a predetermined pitch in the crawler peripheral direction. Minute protrusions (14) extending in a direction intersecting the crawler width direction when viewed from the crawler peripheral direction are formed on a first side surface (12a) and a second side surface (12b) of the lugs (11), the side surfaces (12a, 12b) facing the crawler peripheral direction.

An endless metal belt having an excellent abrasion resistance and a method for manufacturing such endless metal belts, capable of sufficiently reducing a tensile stress related to a metal ring in the innermost layer are provided. An endless metal belt includes a belt member formed by laminating a plurality of metal rings; and an element supported by the belt member, in which among the plurality of metal rings, a metal ring in an innermost layer is formed by a maraging steel plate, and another metal ring includes a nitride layer on its surface, and has a specific chemical composition; a tensile strength of the another metal ring is 1,700 MPa or higher; and a surface hardness of the nitride layer is HV800 to HV950.

Provided is an endless belt which can improve rotational durability when compared to a conventional endless belt. This endless belt is formed in a tubular shape and is used for electronic photographing apparatuses. The endless belt has an edge part which is formed on at least one belt edge in the belt width direction and which has an end that is tapered toward the outside of the belt width direction. The edge part can be configured by a first edge part formed by intersecting an outer inclined surface with a belt inner circumferential surface, a second edge part configured by intersecting an inner inclined surface with a belt outer circumferential surface, or a third edge part configured by intersecting the outer inclined surface with the inner inclined surface.

Provided are a device and a method for inspecting a cylindrical member. During inspection of a cylindrical member, a degree of widthwise misalignment of a strip-shaped member wound around a molding drum is calculated by a control unit on the basis of detection data from a position sensor and position data of drum-widthwise end faces that are perpendicular to a drum axial center of the molding drum, and the widthwise misalignment of the strip-shaped member is determined to be inside or outside an allowable range on the basis of the calculation result.

Provided are a device and a method for inspecting a cylindrical member. During inspection of a cylindrical member, a degree of widthwise misalignment of a strip-shaped member wound around a molding drum is calculated by a control unit on the basis of detection data from a position sensor and position data of drum-widthwise end faces that are perpendicular to a drum axial center of the molding drum, and the widthwise misalignment of the strip-shaped member is determined to be inside or outside an allowable range on the basis of the calculation result.

A method include: providing a cylindrical mold made of metal, a shaped structure having a cylindrical shape, a rotation mechanism configured to rotatably support the cylindrical mold, and an electromagnetic induction coil configured to heat the cylindrical mold through electromagnetic induction; setting the shaped structure inside the cylindrical mold; and molding a cylindrical belt slab by heating the cylindrical mold by the electromagnetic induction coil, while the cylindrical mold is rotated by the rotation mechanism and the shaped structure is pressurized from inside and pressed against the cylindrical mold.