Mould core for a mould for producing hollow concrete bodies, and a moulding device having a mould core of this kind

Mold core for use in a molding apparatus for the production of hollow concrete bodies, the mold core comprising:

• a core mantle extending in the longitudinal direction, the core mantle having a strip-shaped longitudinal opening extending between two longitudinal edges of the core mantle in the longitudinal direction of the core mantle,
• an expansion device for expanding and/or contracting the mold core, and
• a sealing element sealing the longitudinal opening of the core mantle,
• wherein the sealing element has lateral connecting strips extending in the longitudinal direction and a connecting band which is arranged between the connecting strips and is connected to the connecting strips on both sides,
• wherein a cross-sectional profile of the connecting strips of the sealing element each has one or more retaining profile sections protruding and/or engaging into the material of the connecting band, and
• wherein the sealing element is connected to the two longitudinal edges of the core mantle, the lateral connecting strips of the sealing element being held at the longitudinal edges of the core mantle.

Mold apparatus for the production of hollow concrete bodies, comprising:

• an outer mold and
• an inner mold arranged in the outer mold and comprising a mold core,
• the mold core comprising:
• a core mantle extending in the longitudinal direction, the core mantle having a strip-shaped longitudinal opening extending between two longitudinal edges of the core mantle in the longitudinal direction of the core mantle,
• an expansion device for expanding and/or contracting the mold core, and
• a sealing element sealing the longitudinal opening of the core mantle,
• wherein the sealing element has lateral connecting strips extending in the longitudinal direction and a connecting band which is arranged between the connecting strips and is connected to the connecting strips on both sides,
• wherein a cross-sectional profile of the connecting strips of the sealing element each has one or more retaining profile sections protruding and/or engaging into the material of the connecting band, and
• wherein the sealing element is connected to the two longitudinal edges of the core mantle, the lateral connecting strips of the sealing element being held at the longitudinal edges of the core mantle.