| 摘要 |
PURPOSE:To prepare prepreg with a simple and environmental pollution-free process by mixing and extruding molten and solventless thermoset resin with reinforcing base material in an extruder and then semihardening the mixture. CONSTITUTION:Molten thermoset resin (such as phenol resin etc.) is inserted by screw extruders 1, 2 into a sheet die 3 and at the same time reinforcing base material 5 (such as craft paper etc.) is intoduced into the sheet die 3, both are compounded, pulled out of the die lip 6 to obtain resin sheet. Then the composite resin sheet is semi-hardened by infrared heating. |
