Method for the manufacture of a plastic component, plastic component, and shoe
Described are methods for manufacturing a plastic component, in particular a cushioning element for sports apparel, a plastic component manufactured with such methods, for example a sole or a part of a sole for a shoe, and a shoe with such a sole. The method for the manufacture of a plastic component includes loading a mold with a first material includes particles of an expanded material and fusing the surfaces of the particles by supplying energy. The energy is supplied in the form of at least one electromagnetic field.
1. A method for the manufacture of a plastic component comprising:
loading a portion of a mold having a first partial region and a second partial region with a first material which comprises particles of an expanded material, wherein the particles comprise one or more of the following materials: expanded thermoplastic polyurethane (“eTPU”), expanded polyamide (“ePA”), expanded polyetherblockamide, (“ePEBA”), polylactide (“PLA”), polyether-block-amide (“PEBA”), polyethylene terephthalate (“PET”), polybutylene terephthalate (“PBT”), and thermoplastic polyester ether elastomer (“TPEE”); and
fusing surfaces of the particles by supplying energy to the first partial region of the mold at a first frequency and to the second partial region of the mold at a second frequency, wherein the first frequency and the second frequency are different from each other, and
wherein the energy is supplied to the first partial region of the mold and the second partial region of the mold in the form of at least one electromagnetic field in the form of at least one of radiation in the microwave range of 300 MHz-300 GHz or radiation in the radio frequency range of 30 kHz-300 MHz; and
wherein the particles absorb the energy in absence of an additional heat transfer medium being added to the particles or to any portion of the mold.
2. The method according to claim 1 , wherein more energy is supplied to the particles in the first partial region of the mold than in the second partial region of the mold.
3. The method according to claim 1 , wherein the mold is further loaded with a second material in the first partial region and/or second partial region, which is substantially unaltered by the at least one electromagnetic field.
4. The method according to claim 1 , wherein a ratio of the amount of energy absorbed by the first material to the total amount of energy absorbed by the first material and the mold lies in the range 1.0-0.2.
5. The method according to claim 1 , wherein the energy supplied to the first partial region and the energy supplied to the second partial region originate from a single radiation source.
6. The method according to claim 1 , wherein the energy supplied to the first partial region and the energy supplied to the second partial region originate from different radiation sources.
7. The method according to claim 2 , wherein the plastic component is a cushioning element for a shoe, wherein the first partial region is oriented toward a forefoot portion of the cushioning element, and wherein the second partial region is oriented toward a heel portion of the cushioning element.
8. The method according to claim 1 , wherein the energy supplied to the first partial region has a different intensity than the energy applied to the second partial region.