Alternating pressure melt impregnation device and melt impregnation method using the same

A melt impregnation method using an alternating pressure melt impregnation device to impregnate a continuous fiber bundle, comprising steps as follows:

• 1) introducing a single or multiple continuous fiber bundles to a fiber pre-dispersion area, making the continuous fiber bundle successively wind each tension roller in the fiber pre-dispersion area, and preheating and dispersing the continuous fiber bundle;
• 2) injecting a resin melt into each resin melt runner on an upper die and a lower die of a melt injection area, making the resin melt be squirted into an impregnation chamber from each resin melt runner, and in the meantime the resin melt in the impregnation chamber flowing into a decompression chamber from filament-moving holes on throttle plates at both sides of the impregnation chamber;
• 3) continuously drawing the continuous fiber bundle, making the fiber bundle enters into the decompression chamber from a filament-moving hole on the first throttle plate at a filament-input end of the melt injection area for a first impregnation, then exits the decompression chamber via a filament-moving hole on the tail throttle plate, and enters into the impregnation chamber of the melt injection area, the resin melt runner continuously squirting the resin melt, and making the resin melt be squirted to a surface of the continuous fiber bundle for impregnation;
• and
• 4) then drawing the continuous fiber bundle into the decompression chamber through out of the filament-moving hole on the first throttle plate at the filament-input end of the melt injection area, and the continuous fiber bundle passing through the filament-moving hole on the tail throttle plate to complete the impregnation process.