Patent ID: 11865741
Assignee: KURTZ GMBH & CO. KG
Field: Other special machines (Mechanical engineering)
Classification: CPC B  C | IPC B

Claim 20:
21. A method for production of one or more particle foam parts by welding of foam particles using electromagnetic waves, wherein a tool with two mould halves forming a mould cavity is arranged between two capacitor plates, the mould cavity is filled with foam particles, the tool is closed by bringing the two mould halves together, and the tool with the foam particles is subjected to electromagnetic waves, in particular radio waves or microwaves, introduced into the mould cavity via the capacitor plates, wherein the foam particles are heated by the electromagnetic waves and at least partially fuse or bake together, wherein the method is implemented using a tool comprising two mould halves which bound a mould cavity, wherein at least one of the two mould halves is made of a material which is transparent to electromagnetic waves and has a boundary wall which bounds the mould cavity and one or more supports serving to support the boundary wall on a capacitor plate on a side facing away from the mould cavity and forming one or more hollow spaces between the boundary wall and the capacitor plate, and wherein a relation of a volume of the one or more supports and air within the one or more hollow spaces of the two mould halves is adjusted such that a resulting relative permittivity of the tool is adapted to a relative permittivity of the foam particles, such that a temperature in the foam particles is levelled as a whole or can be locally adjusted at need.