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US 10,919,198 B2Granted
Production of complex hollow foam or sandwich structures by means of a mold core
AssigneeEvonik Operations GmbH
InventorsArnim Kraatz, Denis Holleyn
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Abstract
The invention relates to a process for producing complex, mould-foamed rigid foam materials, more particularly of poly(meth)acrylimide (P(M)I) cores, preferably of polymethacrylimide (PMI) cores, which may be employed, for example, in carmaking or aircraft construction. A feature of the process is that through use of a particulate core during foam, it is possible to achieve an additional weight saving relative to foam materials or sandwich materials of the prior art.
Claims18
A process for producing at least one complex rigid foam core, the process comprising:
- producing a filling core, filled with particles and consisting of a foil,
- inserting the filling core into a mold and then closing the mold,
- introducing matrix particles into a cavity between the filling core and an inside wall of the mold,
- foaming the matrix particles, opening the mold, and withdrawing a rigid foam core,
- optionally opening the foil at an accessible former contact region from the inserting, and
- withdrawing the particles from the rigid foam core,
- wherein the matrix particles are pre-foamed P(M)I particles having a particle size between 1.0 and 25.0 mm or are P(M)I suspension polymers having a particle size between 0.1 and 1.0 mm.
4 more elements
Dependencies are inferred from the claim text.