Abstract
In an injection-molding operation that applies vacuum technology, the thin-film sheet product must be molded to a uniform thickness. However, the dike part of the indoor panel of a refrigerator undergoes large variations in its thickness and a high defect rate. Therefore, porous aluminum was used so that a uniform distribution of vacuum pressure can be applied to the entire acrylonitrile butadiene styrene resin in the indoor panel. The pore density of porous aluminum was determined using finite-element analysis, and the products from the developed mold were inspected for corner thickness, cotton flannel marks, and air-hole marks. The defect rate was significantly reduced, and the appearance quality of the product was improved. The improved thin-film-forming technology is expected to greatly contribute to the development of the mold industry.
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