The present invention relates to a ball structure and method for making the same. The ball structure includes an inner bladder and a plurality of covers. The covers surround the inner bladder. Each of the covers includes a base fabric layer, a middle layer and a surface layer. The middle layer is formed form a first polyurethane (PU) solution. A PU solid content of the first PU solution is greater than 70 wt %. The middle layer is a foamed layer, and a porosity thereof is 25% to 85%. The surface layer is formed form a second polyurethane (PU) solution. A PU solid content of the second PU solution is 5 wt % to 20 wt %.

A method of manufacturing a sport ball includes providing a plurality of casing panels including a first panel and a second panel. The first panel has a first surface and an opposite second surface. The first panel includes a first flange area forming a first edge portion of the first panel. The second panel has a third surface and an opposite fourth surface. The second panel includes a second flange area forming a second edge portion of the second panel. The method includes turning the first flange area away from the first surface of the first panel, turning the second flange area away from the third surface of the second panel, abutting the first flange area and the second flange area, and joining the first panel to the second panel.

A cover for a housing of a vehicle and a method of sealing a cover to the housing, where in at least one example, the cover comprises a cover body configured to cover an opening of the housing and to engage the housing at an interface around the opening. The cover may comprise a heating element embedded within the cover body and operable to at least partially melt a portion of the cover body as a part of a process for sealing the cover to the housing. The portion of the cover body may deform and conform to an interface feature at the mating surface of the housing due to the at least partial melting of the portion of the cover body, and, in some examples, the heating element may be configured to fail and be inoperable.

A joint structure comprises a light-absorbable member having at least one opening portion and a light-permeable member superposed on the light-absorbable member so as to cover the opening portion, wherein an annular weld part is formed so as to enclose the opening portion and join the light-absorbable member and the light-permeable member, and the light-permeable member is formed into a thin sheet adhering to the light-absorbable member by deforming at a depressurized state of an interior of the opening portion before the formation of the annular weld part.