Blow-molded foam and method of forming the same
AssigneeKyoraku Co., Ltd.
InventorTakeru SANO
Life of this patent
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Abstract
A blow-molded foam is provided by foaming and blow-molding the resin material including a polyethylene resin. The foamed resin includes the antioxidant by 300 ppm or more in total. The antioxidant is preferably the combination of a phosphorus antioxidant and a phenolic antioxidant. The optimum amount of phosphorus antioxidant to be included is 250 ppm to 3000 ppm, and that of phenolic antioxidant is 250 ppm to 750 ppm. In the manufacture, the collected resin material and the resin including 300 ppm or more of the antioxidant are melted and kneaded and the foaming agent is mixed thereto to provide the foamed resin, and the foamed resin is blow-molded.
Claims15
A blow-molded foam formed by foaming and blow-molding a resin material including a polyethylene resin, wherein
- the foamed resin includes an antioxidant, and
- the antioxidant is included by 300 ppm or more in total.
A method of forming a blow-molded foam by foaming and blow-molding a resin material including a polyethylene resin, the method comprising:
- leaving an antioxidant, of which amount is determined so that the antioxidant is included by 300 ppm or more in a blow-molded foam formed by blow-molding, as an unused resin;
- mixing the unused resin with a collected resin material and melting and kneading the mixture;
- mixing a foaming agent to the mixture to prepare a foamed resin;
- and
- blow-molding the foamed resin.
Dependencies are inferred from the claim text.