Simple, economic process for prodn. of high quality tubes from paper

摘要

A process for prodn. of tubes from paper entails the following steps (i) known, material prepn. is via dissolver (1), refiner (2) and pulp holding vat (3); (ii) a container (6) is filled from the vat with a strained batch of pulp (4) into which is dipped a strainer piece (7) of external shape approximating to the negative mould of the required tube (22); and (iii) a pulp layer (9) is built up on the strainer piece exterior by an internally connected suction pump and conduit (8) to form an intermediate moist, rough shape (10) of the tube on its withdrawal. Also claimed is a produced tube.