Veil with a PVOH fibre binding agent
AssigneeSaint-Gobain Vetrotex France S.A.
InventorMichel Droux
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Abstract
The process according to the invention comprises: a step in which chopped filaments and discontinuous PVOH fibers are dispersed in a process water, followed by a step in which a bed is formed in a forming device by passing the dispersion over a forming cloth through which the process water is drained, the filaments and fibers being retained on said cloth, followed by a heat treatment step in a stoving device. The PVOH fibers impart rigidity to the bed of fibers being formed. This process provides a veil with a very high tensile strength for low proportions of binder.
Claims13
A continuous process for the manufacture of a veil comprising:
- a. forming a dispersion of chopped filaments comprising glass filaments and discontinuous PVOH fibers in a process water, then
- b. forming a bed in a forming device by passing the dispersion over a forming cloth through which the process water is drained, said cloth being a conveyor belt, the filaments and fibers being retained on said cloth, then
- c. subjecting the bed to a heat treatment on a conveyor belt in a stoving device, wherein said veil comprises glass filaments and 1.5 to 15% by weight of a binder which comprises PVOH,
- wherein the passage from the forming device to the stoving device causes the bed to undergo at least one belt hop.
Dependencies are inferred from the claim text.