Method and apparatus for impregnating reinforcement material
A kind of equipment and prepreg technology, which is applied in the field of impregnating fiber reinforced materials to form composite molding materials such as prepregs, which can solve the problems of interfering with the curing reaction and weakening the mechanical properties of the final cured parts
Active Publication Date: 2019-11-05
HEXCEL COMPOSITES SAS +1
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- Claims
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Problems solved by technology
The siloxane of the backing sheet is also a contaminant of the resin, which interferes with the curing reaction and impairs the mechanical properties of the final cured part
Method used
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Embodiment
[0085] Prepregs are produced by the method of the invention using a flat-bed laminator for the textile industry. The machine has: pre-heated IR above the inlet area of the bottom belt, a 2.3 meter long heating area with 18 spring loaded heating elements, driven pressure rollers, and cooling elements with 9 spring loaded heating elements 1.15m long cooling area. The tests were carried out with heated zone elements at temperatures of 100 to 120° C. and line speeds of 4 to 7 m / min. The materials used for the trials were multiaxial E-glass fabrics, especially Biax 600 and Triax 1200gsm (reinforcement materials widely used in wind energy applications), where Hexcel M9.6 and M9.6LT epoxy formulated resins (also wind energy pre- The widely used matrix) is pre-filmed and applied to one or both sides of the reinforcement before being processed in a laminator. The resin film weight per unit area is such that a resin content per unit area of 35 to 50% (typical values in wind ener...
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There is provided a process for preparing a prepreg (31) comprising reinforcement fibre (13) impregnated with a thermosetting resin matrix (20), said process comprising: a) providing a layer (24) of reinforcement fibre (13); b) applying a layer (24) of a first thermosetting resin matrix (20) to the first surface (15) of the layer (24) of reinforcement fibre (13) and bringing the first surface (15)of the layer (24) of reinforcement fibre (13) into contact with the support surface (5) of a first continuous belt (3), so that the layer (24) of first thermosetting resin matrix (20) is positioned between, and in contact with, the first surface (15) of the layer (24) of reinforcement fibre (13) and the support surface (5) of the first continuous belt (3); c) heating the layer (24) of first thermosetting resin matrix (20) applied to the first surface (15) of the layer (24) of reinforcement fibre (13) in contact with the support surface (5) of the first continuous belt (3); d) bringing the second surface (17) of the layer (24) of reinforcement fibre (13) into contact with the support surface 9) of a second continuous belt (7); e) heating the layer (24) of first thermosetting resin matrix (20) and the layer (24) of reinforcement fibre (13) between the support surfaces of the first and second continuous belts (3, 7) so that the first thermosetting resin matrix (20) impregnates the layer(24) of reinforcement fibre (13); f) cooling the layer (24) of reinforcement fibre (13) impregnated with the first thermosetting resin matrix (20) between the support surfaces of the first and secondcontinuous belts (3, 7); and g) removing the layer (24) of reinforcement fibre (13) impregnated with the first thermosetting resin matrix (20) from the support surfaces of the first and second continuous belts (3, 7).
Description
technical field [0001] The present invention relates to a method of impregnating a fibrous material with a thermosetting resin, particularly but not exclusively to a method of impregnating a fibrous reinforcement without the use of a resin backing layer to form a composite molding material such as a prepreg. Background technique [0002] Composite materials include fiber reinforcement embedded within a matrix material. These materials are laid up in molds and allowed to cure to form rigid parts. Typically, the matrix material is formed from a thermosetting resin that is cured by polymerizing it into a rigid lattice of crosslinked polymer chains. In order to ensure that the resin is applied in an optimal amount and that the fibers are fully wetted out, it is preferred to pre-impregnate the fiber reinforcement before applying it to the mould. Pre-impregnated fiber reinforcements are called prepregs. Incomplete impregnation of the fiber material results in increased voids in...
Claims
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IPC IPC(8): B29C70/50B29B15/12B29K101/10
CPCB29C70/504B29C70/506B29B15/12B29K2101/10B29B13/023B29B15/10
Inventor M·阿尔西达科J·埃利斯A·菲舍尔德T·布拉豪斯
Owner HEXCEL COMPOSITES SAS