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

An alternating pressure melt impregnation device, comprising:

• a fiber pre-dispersion area for heating and dispersing a continuous fiber bundle, comprising at least two tension roller sets and an electromagnetic heating apparatus,
• a creel for introducing the continuous fiber bundle to the fiber pre-dispersion area,
• a melt injection area for impregnating the continuous fiber bundle,
• a drawing windup device for pulling the fiber bundle through the impregnation device,
• wherein a plurality of throttle plates are alternately provided at a filament-input end and a filament-output end of the melt injection area respectively, the adjacent throttle plates enclose and form a decompression chamber, at least one decompression chamber exists at the filament-input end of the melt injection area, at least one decompression chamber exists at the filament-output end of the melt injection area, and each throttle plate is provided with a filament-moving hole for the continuous fiber bundle going through;
• and the melt injection area comprises an upper die and a lower die, a space exists between the upper die and the lower die, the space forms an impregnation chamber for a resin melt flowing in, and the upper die and the lower die are each provided with a plurality of resin melt runners connected with the impregnation chamber,
• wherein the at least two tension roller sets are arranged front and rear, each tension roller set consists of two tension rollers arranged front and rear, and the electromagnetic heating apparatus is provided on each tension roller,
• wherein each resin melt runner is perpendicular to a moving direction of the continuous fiber bundle,
• wherein each resin melt runner of the upper die and each resin melt runner of the lower die are in a staggered arrangement.