Process for manufacturing sole with metal support plate or composite support plate
A process for manufacturing a sole with a metal support plate or a composite support plate includes an integrally molding process or a bonding process, in the integrally molding process, the metal support plate or the composite support plate is placed into an injection mold, a sole feed liquid is injected into the injection mold which is bonded in contact with the metal support plate or the composite support plate to mold the sole, the metal support plate or the composite support plate is located between a midsole of a sole body and an outsole of the sole body or above the midsole of the sole body; and in the bonding process, the metal support plate or the composite support plate is adhesively bonded between the midsole of the sole body and the outsole of the sole body or above the midsole by an adhesive coating method.
1 . A process for manufacturing a sole with a metal support plate or a composite support plate, comprising an integrally molding process or a bonding process,
wherein in the integrally molding process, the metal support plate or the composite support plate is placed into an injection mold, a sole feed liquid is injected into the injection mold, the sole feed liquid is bonded in contact with the metal support plate or the composite support plate so as to mold the sole, and the metal support plate or the composite support plate is located between a midsole of a sole body and an outsole of the sole body or above the midsole of the sole body; and
in the bonding process, the metal support plate or the composite support plate is adhesively bonded between the midsole of the sole body and the outsole of the sole body or above the midsole of the sole body by an adhesive coating method,
wherein the metal support plate is integrally molded by a three-dimensional (3D) printing process, and the metal support plate comprises a forefoot portion, an arch portion, and a heel portion connected in this order,
wherein the metal support plate is provided with hollowed mesh holes, a surface of the metal support plate is provided with a thermoplastic polyurethane (TPU) film by means of an injection molding process or adhesive bonding, the TPU film and the metal support plate are combined to form the composite support plate, and the TPU film completely covers the metal support plate and the hollowed mesh holes, or only covers the surface of the metal support plate to expose the hollowed mesh holes, and
wherein the forefoot portion is curved in a direction to a foot of a human body to form a curve section, the TPU film is disposed on the surface of the metal support plate with a molding mold by means of the injection molding process, the molding mold comprises an upper mold and a lower mold, opposing faces of the upper mold and the lower mold cooperate to form a mold cavity, the metal support plate is positioned in the mold cavity with a molding gap between the metal support plate and an inner wall of the mold cavity, the metal support plate is maintained in a pre-stressed state in the mold cavity, in the pre-stressed state, a front end of the forefoot portion is elastically bent upward by 0 to 5° with respect to a middle portion of the forefoot portion, and TPU material is injected into the mold cavity to fill the molding gap and wrap the metal support plate, thereby forming the TPU film, so as to obtain the composite support plate, and after the TPU film is formed, the pre-stressed state is released, resulting in elastic recovery of the composite support plate.
2 . The process for manufacturing a sole with a metal support plate or a composite support plate according to claim 1 , wherein a notch is formed at a front side edge of the forefoot portion, so that the forefoot portion of the metal support plate is divided into two toe pressure deformation portions by the notch, the two toe pressure deformation portions are configured to be deformed when being pressed by a thumb and other four fingers respectively, and a heel relief notch is formed at a rear side edge of the heel portion.
3 . The process for manufacturing a sole with a metal support plate or a composite support plate according to claim 1 , wherein the metal support plate is configured with a plurality of reinforcing ribs arranged in a crisscross pattern, with each adjacent reinforcing rib of the plurality of reinforcing ribs intersecting at angles ranging from 45° to 70°, and the plurality of reinforcing ribs collectively define the hollowed mesh holes.
4 . The process for manufacturing a sole with a metal support plate or a composite support plate according to claim 1 , the metal support plate is convexly configured with reinforcing ribs, at least one of the reinforcing ribs extends along a longitudinal direction of the metal support plate.
5 . The process for manufacturing a sole with a metal support plate or a composite support plate according to claim 1 , wherein the opposing faces of the upper mold and the lower mold are each provided with a plurality of positioning rods, the plurality of positioning rods abut against the surface of the metal support plate, and a virtual curved surface limited by abutting points of the plurality of positioning rods is adapted to a curved surface of the forefoot portion of the metal support plate in an elastically bent state.
6 . The process for manufacturing a sole with a metal support plate or a composite support plate according to claim 5 , wherein positions of the plurality of positioning rods relative to the upper mold and the lower mold are adjustable respectively.
7 . The process for manufacturing a sole with a metal support plate or a composite support plate according to claim 1 , wherein after the composite support plate is taken out from the molding mold, cutting slits are formed on a surface of the TPU film, and a depth of each of the cutting slits is two-thirds of a thickness of the TPU film.