Verfahren zur kontinuierlichen Herstellung von gewellten Schichtstoffbahnen aus Kunststoff und Maschine zur Durchführung des Verfahrens

摘要

824,755. Moulding corrugated reinforced resin sheets. MONTECATINI SOC. GENERALE PER L'INDUSTRIA MINERARIA E CHIMICA. Dec. 31, 1957 [July 8, 1957], No. 40486/57. Class 87(2). A web of polyester resin material having fibrous reinforcement is corrugated by passage between two .complementary sets of shaping elements of non-circular cross-section, extending transversely across the path of the web and carried by endless conveyers moving in the same direction as the web, the latter being maintained under tension until it is self supporting. Glass fibre sheet 2, fed from a reel 7 or 11, and cellulose films 3, 31, fed from reels 18, 181, are passed between rollers 1, 11 where a polyester resin 5 is applied to both sides of the sheet 2 between the films 3, 31. Before passing between the rollers 1, 11, the sheet 2 and the films 3, 31 are heated by infra red radiators 17, 171 and 27, 271, respectively, and the rollers 1, 11 are water cooled. From the rollers 1, 11 the laminate passes between extending rollers 38, 381 to receive adhesive tape 40 applied overits edges by a device 39. The laminate then passes into a curing chamber 6 having. three compartments 41 to 43 heated by circulating hot air to 70‹ to 80‹C., 80‹ to 90‹C., and 95‹ to 100‹C., respectively, if the resin is a polyester resin containing benzoyl peroxide as catalyst. Humidifiers 48, 481 maintain the desired humidity in the compartments 41, 42 to control shrinkage of the cellulose film. At the entrance and exit of the preheating compartment 41 the laminate is stretched transversely by extending rollers 51, 511 and 52, 521. In the curing compartment 42 the laminate is corrugated by passage between endless chain conveyers carrying shaping elements 54, 541 detachably mounted on the chain links to facilitate interchange with shaping elements of other desired form. From the compartment 42 the corrugated laminate passes through an annealing chamber 43, and between grinding discs 65 for trinuning the sides of the sheet. The cellulose films are then removed by apparatus comprising humidifiers 70 and rollers 71 to 74 and 711 to 741. The corrugated sheet then passes over an inspection table 75 to be cut transversely by a cutting disc 76. The sheet 2 may, alternatively, consist of a mat, paper, or paper board of natural or artificial fibres other than glass, or of a wire net.