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US 2009/0155511 A1Published application
Process for the manufacture of curved objects
AssigneeDsm IP Assets B.V.
InventorRoeloef Marissen
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AssigneeDsm IP Assets B.V.
InventorRoeloef Marissen
Estimating the term…
The invention relates to a process for the manufacture of an object, curved in one or more directions, from a package of at least one stacked ply containing polymeric fibres by the deforming thereof at elevated temperature, the process comprising imposing on the fibres a tensile stress at a temperature lying between the melting point of the fibres at the imposed tensile stress and 20° C. below the melting point, which tensile stress is high enough for the fibres to be drawn. This process allows objects, curved in one or more directions, to be produced from flat fibre plies without appreciable wrinkling using even fibre plies with low internal and/or mutual deformability and without material being drawn into the die in a controlled manner. The invention also relates to an object, curved in one or more directions, obtainable by the process according to the invention.
Process for the manufacture of an object, curved in one or more directions, from a package of at least one stacked ply containing polymeric fibres by the deforming thereof at elevated temperature, characterized in that the process comprises imposing a tensile stress on the fibres at a temperature lying between the melting point of the fibres at the imposed tensile stress and 20° C. below the melting point, which tensile stress is high enough for the fibres to be drawn.
Wrinkle-free object, curved in one or more directions, comprising at least one ply containing polymeric fibres, which object exhibits in different locations a different mean fibre diameter, which is the diameter common to the majority of fibres, with the difference between the greatest and smallest mean value being at least 7%.
Dependencies are inferred from the claim text.