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US 12,447,656 B2Granted
Materials and methods
AssigneeQinetiq Limited
InventorsChristopher Douglas James Spooner, Lyn David Jones, Lloyd Morris Wye
Life of this patent
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Abstract
A method of forming a shaped foamed polymer article (16) and articles obtained from said method.
Claims26
A method of forming a shaped foamed polymer article in a mould tool system from a polymer composition, wherein:
- said polymer composition comprises a polymer and a foaming agent;
- said mould tool system comprises a core part and a cavity part;
- said core part and cavity part are engaged with one another to form a mould cavity;
- a polymer insert is located in the mould cavity;
- further wherein said method comprises:
- heating the polymer composition to a temperature at or above the melting temperature of the polymer composition to form a foamed polymer composition;
- heating the mould cavity to a temperature at or above the melting temperature of the foamed polymer composition;
- heating a surface layer of the polymer insert to a temperature which is at or greater than a melting temperature of the polymer insert;
- feeding the heated foamed polymer composition into the mould cavity such that the heated foamed polymer composition is overmoulded on to the polymer insert while the surface layer of the polymer insert is at or above the melting temperature;
- cooling the mould cavity to a temperature below the melting temperature of the foamed polymer composition.
7 more elements
Dependencies are inferred from the claim text.