IN-MOLD ONE-TIME FOAMING MOLDING PROCESS AND FOAM PRODUCT

摘要

An in-mold one-time foaming molding process, comprising the following steps: S1: pre-impregnating a resin bead in supercritical gas to obtain a bead to be foamed; S2: transferring the bead into a closed space, and introducing moist air, so that the bead is in a fluidized state; S3: heating the bead to be foamed and the moist air by using microwaves; and S4: conducting exhaust foaming molding to obtain a foam product. The foam product is obtained by one-step forming, no defects exist inside the product, and the performance is good. The bead is heated using microwaves, the heat efficiency is high, the heat transfer depth is large, and the heating time is short. A mold made from a non-polar material with dense small holes in the upper and lower surfaces is used, so that processing and obtaining are easy, and the cost is low. In addition, an air blowing device is provided below the mold to guarantee that the bead is in a fluidized state during microwave irradiation, so that the bead is uniformly heated and does not generate accumulation defects. A supercritical fluid is used as a physical foaming agent for impregnating and foaming, so that the production process is green and environmentally friendly, and the process is suitable for industrial production.