| 摘要 |
PURPOSE:To keep the tackiness and deaerating properties of prepreg and remove voids in a formed set material by a method wherein a plurality of grooves, which are arranged continuously and longitudinally, are shaped on the surface of thermosetting resin prepreg reinforced by paralleled yarns. CONSTITUTION:The shaping of grooves is performed by pressing a so-called groove roll, which has recessed and projected parts peripherally, against the surface of prepreg. In this case, either on-line groove shaping in the impregnating process of the prepreg or off-line groove shaping by after-working the prepreg, which has been once formed by a prepreg machine, with the similar grooved roll will do. At the groove shaping on the prepreg, the temperature of a preheating plate 14 is important and depends upon nip pressure, resin viscosity, the resin content in the prepreg. the thickness of the prepreg, the production speed of the prepreg and the like and is preferably 35-85 deg.C and more preferably 40-60 deg.C. The groove shaping method by pressing embossed paper having, for example, longitudinally arranged recessed and projected parts is employed also except one with the grooved roll. |
