Latex free balloon and manufacturing process

This balloon comprises a first balloon sheet (12), a second balloon sheet (11) and a self-closing valve (2) fixed by means of a closing weld (3) establishing the peripheral joining of the first sheet (11) and the second sheet (12); forming a stem-free inflatable body. The valve (2) consists of two sheets (21, 22) of a multi-layer material at least consisting of one layer (n) of resilient material, with high barrier effect and punching resistance and by two layers (t) of heat-sealable material, conforming the inner and outer sides of each one of said sheets (21, 22). Internally, the valve has an unweldable covering area (27) superimposed with the closing weld (3); a portion (28) of the valve (2) protruding from the inflatable balloon body (1).