Double-sided melt impregnation method and equipment for continuous long fiber reinforced thermoplastic resin

Abstract

The invention discloses a double-faced melt impregnation method and device for continuous long fiber reinforced thermoplastic resin. The method comprises the steps of firstly carrying out pre-dispersion and preheating on continuous long fibers, then carrying out comprehensive packaging and infiltration by virtue of a double-faced distribution runner, carrying out fiber re-dispersion processing, and sending the treated fibers out of a fiber channel. The device is characterized in that a fiber pre-dispersion region, a resin-infiltration fiber region and a fiber re-dispersion region are arranged in the fiber channel in a melt impregnation machine head, wherein the double-faced distribution runner is arranged in the resin-infiltration fiber region and comprises an upper-layer distribution runner and a lower-layer distribution runner which are structurally symmetrical; a pre-dispersion device is arranged in the fiber pre-dispersion region, and a re-dispersion device is arranged in the fiber re-dispersion region. According to the double-faced melt impregnation method and device, an impregnation effect of resin melt to continuous long fiber bundles is balanced, purposes of complete cladding, permeation and infiltration are achieved, a phenomenon that the single sides of the fibers are not tightly clad is avoided, the long-time continuous stable production is realized, and the yield and the quality of a product are substantially improved.

Description

technical field [0001] The invention relates to the technical field of thermoplastic resin molding, in particular to a double-sided melt impregnation method and equipment for continuous long fiber reinforced thermoplastic resin. Background technique [0002] Continuous long fiber reinforced thermoplastic resin is an intermediate used to prepare composite materials with thermoplastic resin as the matrix and reinforced fibers arranged in one direction and continuously. It has a wide range of applications in the fields of transportation, automobiles, petroleum, natural gas or construction. Especially in the field of automobiles, continuous long-fiber-reinforced thermoplastic resins can be drawn and pelletized by a die with a specific shape to obtain long-fiber-reinforced pellets, and then formed by secondary injection molding to form long-fiber-reinforced parts, which can widely replace various parts inside automobiles. A variety of metal structural parts, such as front-end mod...

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Problems solved by technology

First of all, the resin melt also emerges from the lower side of the discharge roller, so it is difficult to fully cover the infiltrated fiber bundles, and each fiber has the inhomogeneity that one side is infiltrated first, and the other side is infiltrated later; secondly, the equipment will The apex of the feed roller is the place where the fiber and the resin meet and infiltrate. Since the apex of the discharge roller is the crest, the tension is the highest. Although the effect of fiber impregnation can be enhanced, the risk of fiber breakage is increased, and the phenomenon of strip breakage is prone to occur; again, The equipment divides the outlet of the resin melt into two, so that the long fiber bundles are infiltrated twice successively, and the melt resistance of the two flow channels is different, which may cause inhomogeneity of the melt feeding and cause greater impregnation differences, ultimately affecting fiber content and product appearance

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