Process and so-called rotational moulding means for hollow geometrical bodies with a reinforced mouth in which the inside wall has a substantially straight continuous generatrix

摘要

Creating in mould 2, 2' a critical distance A designed to be cancelled out in operation, up to fitting together, with substantially constant thicknesses, phenomena which can be regarded as hourglass phenomena in each bottle, to distribute the correct quantities of powder necessary and sufficient to guarantee the growth and joint definition of the thicknesses of the manufactured article 1. In order that this should take place it is necessary to comply with the principle that the slot filled by the meeting together of the two thicknesses is correlated with the correct quantity of material in accordance with the formula: P = p.S. 1/2A, where: A = slot width, p = specific gravity of the material S = total surface area, P = weight of powder added, Quantities P = non-closure of the slot Quantities P = surplus accumulation on the walls of the main bottle, using the formula: a = Pe/Sp.p where: a = thickness exceeding equality, Pe = excess weight, Sp = surface area of the main bottle. IMAGE