Abstract: A flexible crack-resistant and chemically resistant thermosetting vinyl ester resin is produced by co-reacting an epoxy resin, a carboxyl terminated elastomer and an unsaturated monocarboxylic acid, such as acrylic or methacrylic acid. The neat resin is miscible and copolymerizable with ethylenically unsaturated monomers such as styrene. A novel cast pipe utilizes the resin of the invention as an unreinforced crack-resistant inner lining. This abstract is neither intended to define the invention of the application which, of course, is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.

Abstract: A thin film plastic is centrifugally cast against an aluminum preform which is placed in a precisely machined polygonal master in a conventional replica process. The plastic which may be an epoxy material is applied to the preform master assembly with centrifugal force causing it to impact in the cavity between the preform and the master to produce a bubble-free layer. Thus, a high speed multifaceted polygonal scanning system is provided which may be employed in a flying spot scanning application.

Abstract: A process for forming a tubular member includes rotating a tubular form about a central axis. The form is provided with an interior coating of time-setting, liquid material. A number of lengths or strips of roving, preferably of fiber glass, are introduced serially into the rotating tubular form in a direction substantially chordally of the tubular form so that each roving strip tends to be embedded approximately circumferentially by centrifugal force into the liquid material. The roving strips are approximately as long as the diameter of the tubular form and in effect make a helix. The material hardens with the roving embedded therein. The hardened material and roving are then removed as a tubular member from the stationary form. The product of the invention is a member of tubular shape comprised of a helix formed of substantially circumferentially extending lengths of fiber glass roving, each length being approximately the diameter of the tube, all embedded in a solid matrix of time-setting material.

Abstract: Method and apparatus for producing glass fibre reinforced plastic pipes and the like wherein a rotatable hollow mould form is provided, an elongated roll of reinforcing fibres is located on holding means which are placed in the concavity of the mould, spaced from the sides of the mould, the mould is rotated and the fibre roll is unrolled onto the mould face to deposit fibres thereon and settable synthetic resinous material is introduced into the mould form. The holding means may be adapted to move the roll of reinforcing fibres from a position wherein it is spaced from the mould surface to a position wherein it is in contact therewith and the holding means may be rotatable with the leading edge of the roll secured until the roll has attained a suitable speed.

Abstract: Methods of centrifugally molding a resin pipe or molding a layered composite pipe utilizing a rotating inner member are disclosed. The rotating inner member rotates at a speed higher than the centrifugally rotating mold and is movable towards and away from the mold surface. Movement toward the mold compresses the molding material between the rotating inner member and the centrifugally rotating mold. Movement away from the mold permits any material adhering to the inner member to be cleaned from said inner member due to the centrifugal speed of said inner member.

Abstract: Method of making a plastic pipe and method of making same, having an outer shell of reinforced thermo-setting resin and an inner shell of thermo-setting and thermo-plastic resins.

Abstract: A process of forming a tubular member includes rotating a tubular form about a central axis. The form is provided with an interior coating of time-setting, liquid material. A number of lengths or strips of roving, preferably of fiber glass, are introduced serially into the rotating tubular form in a direction substantially chordally of the tubular form so that each roving strip tends to be embedded approximately circumferentially by centrifugal force into the liquid material. The roving strips are approximately as long as the diameter of the tubular form and in effect make a helix. The material hardens with the roving embedded therein. The hardened material and roving are then removed as a tubular member from the stationary form. The product of the invention is a member of tubular shape comprised of a helix formed of substantially circumferentially extending lengths of fiber glass roving, each length being approximately the diameter of the tube, all embedded in a solid matrix of time-setting material.