Fiber bundle fuse dipping die head for producing long fiber reinforced plastic and dipping method

Abstract

The invention discloses a fiber bundle fuse dipping die head for producing long fiber reinforced plastic and a dipping method. The fiber bundle fuse dipping die head comprises a die head shell, a contact fiber guiding roll and a non-contact fiber guiding roll pair which are arranged in the die head shell. The contact fiber guiding roll includes a coaxial drum body; the non-contact fiber guiding roll pair is a fixing roll or an automatic driving roll and has a round, polygon or multi-edge transverses section surface. The dipping method comprises the following steps: in a die cavity full of fusant, a fiber bundle alternately winds the drum body of the contact fiber guiding roll under the tension traction and penetrates through a gap between the non-contact fiber guiding roll pair, and the dipped fiber bundle is exported from a derivative channel. The invention can reduce the friction consumption of the single fiber, ensure that the fuse and the dipping of the continuous fiber bundle operate stably at high dipping line speed, improve the dipping efficiency and reduce the production cost of long fiber reinforced thermoplastic plastics.

Description

technical field [0001] The invention belongs to the technical field of polymer material molding and processing, and in particular relates to a fiber tow melt-impregnation die head and an impregnation method, which are used for the production of long-fiber-reinforced thermoplastics. Background technique [0002] Affected by plasticizing processing, the fiber length of traditional fiber-reinforced thermoplastics is generally less than 0.5 mm, and the mechanical damage of its products is mainly caused by the fibers being pulled out from the matrix, and the fiber strength is basically not utilized. At the end of the last century, long fiber reinforced thermoplastics (LFRT) emerged in the international composite material market. Compared with traditional fiber-reinforced plastics, the fiber length of LFRT is greater than the critical length of the fiber drawn from the plastic matrix, which better exerts the reinforcing ability of the fiber, thus endowing the product with higher s...

AI Technical Summary

Problems solved by technology

However, when running at high speed, the probability of friction and breakage of the fiber is high, resulting in unstable impregnation operation

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