Abstract: Disclosed herein is a composite comprising at least one heat shrinkable adhesive layer stitch-bonded with yarns, which shrink less than the adhesive layer or do not shrink, when the adhesive layer is exposed to heat. The stitch-bonded yarns form loops upstanding from the shrunk adhesive layer and the loops create a textured surface on the composite, and the composite is substantially inelastic after the adhesive layer is shrunk. The composite may further comprise at least one fibrous layer stitch-bonded to the shrinkable adhesive layer, and the fibrous layer is less shrinkable than the adhesive layer or is substantially non-shrinkable.

Abstract: There is disclosed an improved pump (5, 5?) particularly suitable for use in a method of “artificial lift” in an oil/gas well. Known pumps used in artificial lift methods suffer from a number of problems/disadvantages—e.g. low efficiency (hydraulic efficiency). The disclosed embodiments of the invention provide a pump (5, 5?) which provides a positive displacement of a predetermined volume of well production fluid for each operative cycle of the pump-in contra-distinction known to pumps which provide axial flow of well production fluid. The inventive pump (5, 5?) provides a chamber (10, 10?) having a volume (V, V?), an inlet (15) to the chamber (10, 10?), an outlet (20) from the chamber (10, 10?), and means for varying the volume (V, V?) of the chamber (10, 10?). The means for varying the volume (V, V?) of the chamber (10, 10?) is controlled by relative rotation of first and second bodies (30, 35, 30?, 35?).