FLEXURALLY RIGID COMPOSITE SHEET
First Claim
Patent Images
1. A flexurally rigid composite sheet, comprising a thermally consolidated sandwich structure comprising:
- A. one or two outer layers with a thickness of 0.5 to 5 mm comprising glass-fiber reinforced polypropylene with a glass content of 20 to 60 wt-% and an air void content of less than 5 vol-%, andB. a core layer with a thickness of 2 to 40 mm comprising glass-fiber reinforced polypropylene with a glass content of 35 to 80 wt-% and an air void content of 20 to 80 vol-%,wherein the core layer has been obtained by dry blending of polypropylene fibers and glass fibers, needling of the blended nonwoven, and heat pressing.
1 Assignment
0 Petitions
Accused Products
Abstract
Rigid yet lightweight composite sheets contain a core layer formed by thermal consolidation of a needled non-woven mat of glass fibers and polypropylene fibers, optionally with a melt-bonded polypropylene film on at least one side thereof, sandwiched between layers of GMT. The core contains from 20 to 80 volume percent air voids, whereas the GMT outer layers have a very low or zero void content. The composite sheets may be used for structural panels, for fabricating furniture, and for other uses.
-
Citations
17 Claims
-
1. A flexurally rigid composite sheet, comprising a thermally consolidated sandwich structure comprising:
-
A. one or two outer layers with a thickness of 0.5 to 5 mm comprising glass-fiber reinforced polypropylene with a glass content of 20 to 60 wt-% and an air void content of less than 5 vol-%, and B. a core layer with a thickness of 2 to 40 mm comprising glass-fiber reinforced polypropylene with a glass content of 35 to 80 wt-% and an air void content of 20 to 80 vol-%, wherein the core layer has been obtained by dry blending of polypropylene fibers and glass fibers, needling of the blended nonwoven, and heat pressing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification