Foam-containing structures
AssigneeDowty Rotol Limited
InventorRoy F. J. McCarthy
Life of this patent
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Abstract
This invention relates to a method of making a foam-containing structure which includes placing and suitably retaining a respective first shaped sheet in each of first and second complementary parts of an open mould. Each sheet includes at least one layer of fibrous material. A further respective shaped sheet is placed and suitably retained upon each first sheet. Each said further sheet comprises a layer of fibrous material and an impervious membrane adhering thereto. When the two mould parts are closed together a foamable material is introduced into a cavity formed between the sheets and is then caused to expand, whereupon each membrane is caused to adhere to its adjacent first sheet but prevents penetration of the expanding material into that sheet.
Claims13
A method of making a foam-containing structure comprising:
- (a) placing and suitably retaining a respective first shaped sheet in each of first and second complementary parts of an open mould, each said sheet including at least one layer of fibrous material, (b) placing and suitably retaining a further respective shaped sheet upon each said first sheet, each said further respective shaped sheet comprising a layer of fibrous material and an impervious membrane adhering thereto, (c) closing said two mould parts together with said sheets still retained therein thus to define a cavity between said sheets (d) introducing a foamable material into said cavity, (e) causing said foamable material within said cavity to expand to a foamed state, whereupon each said impervious membrane is caused to adhere to its adjacent said first sheet, but prevents penetration of the expanding material into that sheet, and (f) removing the formation of sheets and expanded material so produced from the mould.
A method of making a foam-containing structure comprising:
- (a) placing and suitably retaining a respective first shaped sheet in each of first and second complementary parts of an open mold, each said sheet including at least one layer of fibrous material, (b) placing and suitably retaining a further respective shaped sheet upon each said first sheet, each said further respective shaped sheet comprising a layer of fibrous material and an impervious membrane adhering thereto, (c) closing said two mold parts together with said sheets still retained therein thus to define a cavity between said sheets, (d) introducing a foamable material into said cavity, (e) causing said foamable material within said cavity to expand to a foamed state, whereupon each said impervious membrane is caused to adhere to its adjacent said first sheet, but prevents penetration of the expanding material into that sheet, and (f) removing the formation of sheets and expanded material so produced from the mold, wherein each said impervious membrane is subjected to a partial curing process before it is placed, together with its respective said layer of fibrous material, upon its respective said first sheet.
Dependencies are inferred from the claim text.