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US 2007/0164131 A1Published application
Process and apparatus for producing structural elements
AssigneeBayer MaterialScience AG & Hennecke GmbH
InventorsIngo Kleba, Hans-Guido Wirtz
Life of this patent
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Abstract
Structural elements are produced by applying a polyurethane (PUR)-forming reactive mixture and solid particles to a fibrous web in amounts such that the particle density is from 0.01 to 10.0 g of solid particles/cm2 of coated fibrous web surface being set, and then pressing to harden the fibrous web coated with the not-fully-cured polyurethane reactive mixture containing solid particles.
Claims22
A process for producing structural elements comprising:
- a) applying a polyurethane-forming reactive mixture and solid particles to a fibrous web in a manner such that from 0.01 to 10.0 g of solid particles are present on each square centimeter of coated fibrous web surface, and
- b) pressing the fibrous web coated with polyurethane-forming reactive mixture containing solid particles.
A spray head for spraying polyurethane-forming reactive mixture charged with solid particles, comprising
- a) at least one spray-mixing head for the polyurethane-forming reactive mixture containing a spray nozzle for the polyurethane-forming reactive mixture,
- b) at least one first conduit section for pneumatically conveying the solid particles comprising
- (1) an inlet opening for a gas stream and
- (2) an intake fitting for the solid particles arranged substantially concentrically in the first conduit section, having a center of gravity axis of the first conduit section extending in the particles' flow direction and a spray jet axis extending in the spray nozzle's direction of spray which form an angle a in the range of from 10° to 120°, and
- c) at least one second conduit section for pneumatically conveying the solid particles, into which the first conduit section opens which second conduit section has an outlet opening arranged in proximity to the spray nozzle for the polyurethane-forming reactive mixture and is oriented towards the spray nozzle's emerging jet spray of polyurethane-forming reactive mixture with the first conduit section's center of gravity axis extending in the flow direction, and the second conduit's outlet opening center of gravity axis extending in the flow direction forming an angle β in the range from 60° to 170°.
2 more elements
Dependencies are inferred from the claim text.