| 摘要 |
A method of manufacturing inflated articles of plastics materials, of which the shapes and volumes are obtained by controlled over-extension of the plastics films, consists in fabricating a central section of the article by a film or a sheet of substantially unelastic plastics material, having a coefficient of extensibility as low as possible. The periphery is made to correspond to the profile of the desired section, this film being sandwiched between two films of plastics material of the same shape, to whose edges it is bonded by welding. At least, one film comprises an inflating valve. The article is inflated to a definite pressure by the desired deformation of the outer films as a function of their nature and their thickness, the balancing of the inflating pressures, on each side of the central film being ensured by a communicating orifice arranged at the center of the central film. Preferably, the orifice arranged at the center of the central film has a profile geometrically similar to that of the section of the fabricated article through the said central film, e.g. circular. The cutting out and welding of the films may be effected in a single operation. The plastics material may be polyvinyl chloride.
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