METHOD FOR INCREASING ADHESIVE CAPACITY OF MOLDED SOLE SURFACES Russian patent published in 2007 - IPC A43B13/32 C09J5/02 B29D31/515 

FIELD: shoe industry, in particular, process using glue for fastening of molded soles made from polymeric materials having low adhesion to shoe top materials such as elastic thermoplastics.

SUBSTANCE: method involves forming grooving on non-wear surface of molded soles in zone of glue fastening corresponding to zone of contacting with lasting edge of top part, said grooving being defined by projections formed as regular rectangular truncated pyramids defining grooved surfaces, with lateral faces of projections defining angles of 3-5 deg, and sides of projections bases and distances between bases of adjacent projections being equal to one another; in case soles are attached using glue, providing embedding of projections into structure of top part materials by applying pressure for creating of keying action effect for surfaces to be glued to thereby form adhesive layer of uniform thickness between materials to be fastened to one another. Maximum strength of glue fastening is reached in gluing of soles made from materials having hardness of 65-80 conventional units with height h of projections of 0.5-0.8 mm, grooving pitch s=1.6-2.2 mm and applied pressure P_pr=0.5-0.75 MPa, and in case soles made from materials having hardness of 55-65 conventional units are to be glued, with height h of projections of 0.3-0.6 mm, grooving pitch s=1.2-1.8 mm and applied pressure P_pr=0.45-0.55 MPa.

EFFECT: increased adhesive capacity of shoe sole surfaces of polymeric materials to be fastened with one another and having adhesion insufficient for fastening to shoe top part materials.

2 dwg, 1 tbl