A Compression Molding Process Using Polymer Films to Improve the Appearance of Fiber Composites

Abstract

The invention discloses a compression molding technology capable of improving fiber composite appearance by means of a polymeric film. The compression molding technology comprises the steps that fiber composite cloths and the polymeric film are cut according to the structural design specification size and then cleared up for use; the fiber composite cloths are folded in a rowed mode and layered up according to the mechanical structural design requirements, and the polymeric film is attached to the outermost layer of the fiber composite cloths; a rolled product is put on a heating platform with the temperature ranging from room temperature to 80 DEG C to be preheated for 3-60 min, gas among layers is exhausted in an extruding mode as much as possible, the product is pressed to be smooth and then put into a pre-molding mold, and pre-molding is conducted according to the shape designed by the pre-molding mold; the product is put into a mold to be molded; the mold obtained after molding is delivered to a cooling platform to be cooled and then delivered to a demolding platform, the product is taken out by opening the mold, and the smooth and plump product appearance is obtained. According to the technical scheme, a traditional tedious soil-supplementing repairing technology is replaced, and the high-quality fiber composite product appearance can be directly obtained through preparation.

Description

technical field [0001] The invention relates to the field of fiber composite molding, in particular to a molding process for improving the appearance of fiber composites by using a polymer film. Background technique [0002] Compression molding (also known as compression molding or compression molding) is one of the oldest forming methods in the production of composite materials. It is a method in which a certain amount of premix or prepreg is added to the metal pair mold, and it is cured by heating and pressure. [0003] At present, all products made of fiber composite materials, such as rackets, bicycles, drones, bats, etc., are affected by changes in molds, materials, release agents, air pressure and weather during the production process. There will be unevenness, lack of material, and pinholes, especially when some products require the texture of special materials on the surface. Once the product has the above-mentioned poor appearance, the product will become a substan...

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Problems solved by technology

If the polymeric film is not suitable, workers will stick to their hands during operation, causing inconvenient operation; if the polymeric film is cured earlier than the inherent resin in the fiber composite cloth, it will not have the effect of removing air bubbles and improving the appearance; when the fiber composite cloth When the interlayer air bubbles are transferred to the polymeric film resin layer under the action of molding extrusion, the fluidity control of the polymeric film resin is poorly matched, which will cause the polymeric film resin containing air bubbles to not be discharged from the mold line between the moulds. As a result, the air bubbles remain in the product, resulting in poor appearance of the product, such as pores, pinholes, and lack of glue. These defects lead to a decrease in the strength of the product and an increase in the defective rate

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