| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a long fiber reinforced resin molded object containing reinforcing fibers used as a material without damaging the length thereof and improved in the opening properties of reinforcing fibers. SOLUTION: The long fiber-containing molten thermoplastic resin, which is obtained by plasticizing a long fiber-containing thermoplastic resin by an injection molding machine, is metered so that a metering stroke becomes 50% or above of the maximum injection stroke of the injection molding machine while rotating the screw in the injection molding machine and injected in a pair of mold cavities and solidified to manufacture the long fiber reinforced resin molded object. In this manufacturing method of the long fiber reinforced resin molded object, the back pressure of the screw at the time of metering is changed over at an arbitrary place up to a metering completion position from metering start position and the back pressure (P2) up to the metering completion position from the metering start position is higher than the back pressure (P1) up to the changeover place from the metering start position. COPYRIGHT: (C)2008,JPO&INPIT
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