| 主权项 |
1. An intermediate material comprising a preform made up of multiple layers of veiled ribbons, said preform having a principal axis and wherein said preform comprises:
a first layer comprising first veiled ribbons that are oriented parallel to each other in a first angular direction with respect to said principal axis, said first veiled ribbons each comprising a layer of first unidirectional fibers and a veil of thermoplastic located on a first side of said layer of first unidirectional fibers and a veil of thermoplastic located on a second side of said layer of first unidirectional fibers, said first veiled ribbons each comprising edges such that the width of said first veiled ribbons between said edges ranges from 3 mm to 25 mm and wherein said first veiled ribbons are spaced apart in said first layer to provide first linear gaps between said first veiled ribbons that are adjacent to each other, said first linear gaps being between 0.2 mm and 0.4 mm wide; a second layer comprising second veiled ribbons that are oriented parallel to each other in said first angular direction with respect to said principal axis, said second veiled ribbons each comprising a layer of second unidirectional fibers and a veil of thermoplastic located on a first side of said layer of second unidirectional fibers and a veil of thermoplastic located on a second side of said layer of second unidirectional fibers, said second veiled ribbons each comprising edges such that the width of said second veiled ribbons between said edges ranges from 3 mm to 25 mm and wherein said second veiled ribbons are spaced apart in said second layer to provide second linear gaps between said second veiled ribbons that are adjacent to each other, said second linear gaps being between 0.2 mm and 0.4 mm wide and wherein said second layer is bonded to said first layer so that the first side of said layer of first unidirectional fibers is adjacent to the first side of said layer of second unidirectional fibers, said first veiled ribbons and said second veiled ribbons being superposed over each other so that said first linear gaps are aligned with said second linear gaps; a third layer comprising third veiled ribbons that are oriented parallel to each other in a second angular direction with respect to said principal axis, said second angular direction being different from said first angular direction, said third veiled ribbons each comprising a layer of third unidirectional fibers and a veil of thermoplastic located on a first side of said layer of third unidirectional fibers and a veil of thermoplastic located on a second side of said layer of third unidirectional fibers, said third veiled ribbons each comprising edges such that the width of said third veiled ribbons between said edges ranges from 3 mm to 25 mm and wherein said third veiled ribbons are spaced apart in said third layer to provide third linear gaps between said third veiled ribbons that are adjacent to each other, said third linear gaps being between 0.2 mm and 0.4 mm wide and wherein said third layer is bonded to said first layer so that the second side of said layer of first unidirectional fibers is adjacent to the first side of said layer of third unidirectional fibers; a fourth layer comprising fourth veiled ribbons that are oriented parallel to each other in a third angular direction with respect to said principal axis, said third angular direction being different from said first angular direction and said second angular direction, said fourth veiled ribbons each comprising a layer of fourth unidirectional fibers and a veil of thermoplastic located on a first side of said layer of fourth unidirectional fibers and a veil of thermoplastic located on a second side of said layer of fourth unidirectional fibers, said fourth veiled ribbons each comprising edges such that the width of said fourth veiled ribbons between said edges ranges from 3 mm to 25 mm and wherein said fourth veiled ribbons are spaced apart in said fourth layer to provide fourth linear gaps between said fourth veiled ribbons that are adjacent to each other, said fourth linear gaps being between 0.2 mm and 0.4 mm wide and wherein said fourth layer is bonded to said third layer so that the second side of said layer of third unidirectional fibers is adjacent to the first side of said layer of fourth unidirectional fibers; a fifth layer comprising fifth veiled ribbons that are oriented parallel to each other in a fourth angular direction with respect to said principal axis, said fourth angular direction being different from said first angular direction, said fifth veiled ribbons each comprising a layer of fifth unidirectional fibers and a veil of thermoplastic located on a first side of said layer of fifth unidirectional fibers and a veil of thermoplastic located on a second side of said layer of fifth unidirectional fibers, said fifth veiled ribbons each comprising edges such that the width of said fifth veiled ribbons between said edges ranges from 3 mm to 25 mm and wherein said fifth veiled ribbons are spaced apart in said fifth layer to provide fifth linear gaps between said fifth veiled ribbons that are adjacent to each other, said fifth linear gaps being between 0.2 mm and 0.4 mm wide and wherein said fifth layer is bonded to said second layer so that the second side of said layer of second unidirectional fibers is adjacent to the first side of said layer of fifth unidirectional fibers; and a sixth layer comprising sixth veiled ribbons that are oriented parallel to each other in a fifth angular direction with respect to said principal axis, said fifth angular direction being different from said first angular direction and said fourth angular direction, said sixth veiled ribbons each comprising a layer of sixth unidirectional fibers and a veil of thermoplastic located on a first side of said layer of sixth unidirectional fibers and a veil of thermoplastic located on a second side of said layer of sixth unidirectional fibers, said sixth veiled ribbons each comprising edges such that the width of said sixth veiled ribbons between said edges ranges from 3 mm to 25 mm and wherein said sixth veiled ribbons are spaced apart in said sixth layer to provide sixth linear gaps between said sixth veiled ribbons that are adjacent to each other, said sixth linear gaps being between 0.2 mm and 0.4 mm wide and wherein said sixth layer is bonded to said the fifth layer so that the second side of said layer of fifth unidirectional fibers is adjacent to the first side of said layer of sixth unidirectional fibers. |
