초록 ▼

A shaped article of fiber reinforced material is made by forming a foamed aqueous dispersion having single discrete fibers, and unconsolidated particulate thermoplastic or thermosetting material, laying down and draining the dispersion to form a web, transferring the web to an oven and heating it to

A shaped article of fiber reinforced material is made by forming a foamed aqueous dispersion having single discrete fibers, and unconsolidated particulate thermoplastic or thermosetting material, laying down and draining the dispersion to form a web, transferring the web to an oven and heating it to form a self-sustaining permeable sheet, transferring the sheet to a through-air heating oven, passing heated air through the sheet to cause substantially uniform and homogeneous heating of the thermoplastic component, transferring the heated sheet to a compression mold, and subjecting the sheet to compression molding to form a shaped fiber reinforced plastic article.

대표청구항 ▼

A process for making a shaped article of fiber reinforced synthetic plastics material comprising the steps of forming a foamed aqueous dispersion comprising from 20% to 60% by weight of single discrete fibers having a modulus of elasticity higher than 10,000 mega pascals, and between 7 and 50 millim

A process for making a shaped article of fiber reinforced synthetic plastics material comprising the steps of forming a foamed aqueous dispersion comprising from 20% to 60% by weight of single discrete fibers having a modulus of elasticity higher than 10,000 mega pascals, and between 7 and 50 millimeters long, and from 40% to 80% by weight of unconsolidated particulate plastics material selected from the group consisting of a thermoplastic material and a thermosetting material, the particulate plastics material having a particle size of less than about 1.5 millimeters; laying down and draining said dispersion on a foraminous support so as to form a web; transferring said web to a heating oven; heating said web first so as to remove residual moisture therefrom and then so as to bond the fibrous and plastics components together into a self-sustaining permeable sheet while substantially maintaining the particulate form of the plastics material; transferring said self-sustaining sheet to a through air heating oven; passing heated air through said sheet so as to cause substantially uniform and homogeneous heating of the components thereof to a temperature at which the viscosity of the thermoplastic constituting the particulate component is sufficiently low to permit the sheet to be molded into a shaped article; transferring said heated permeable sheet to a compression mold; and subjecting said sheet to a compression molding at a predetermined pressure so as to form a shaped fiber reinforced plastic article.