Abstract: An apparatus and a method for dry forming of fibre weave (9) are disclosed. The apparatus comprises a suction box (4) and a superjacent forming head and a forming wire (2) placed in between. The weave (9) is formed on the forming wire, in that the suction box (4) has an active suction area (17) that sucks the fibres towards the forming wire (2). With the object of avoiding beaching in the formed fibre weave (9) a pressure drop regulating means (3) is mounted in the suction box in a sub-section of the suction area (17).

Abstract: A method of making a capillary tube for providing increased control of electroosmotic flow in electrophoretic separation. A resistive coating solution is formed so that a tube coating having a high electrical resistivity may be achieved. An electrically conductive material, such as carbon black, is homogeneously mixed with a polymer, such as polyimide, in a solvent. The content by weight of the electrically conductive material is less than 20 percent and is preferably within 7 percent to 8 percent, relative to the content by weight of the polymer. The resistive coating solution is applied to the exterior of the tube until a thickness is reached which achieves a desired resistance across the coated exterior surface. Typically, a multi-layered coating is formed. The coating solution may be applied while rotating the capillary tube or, alternatively, while the capillary tube is drawn past an applicator.