Patent ID: 8679620

Claim:
A foamed product formed by heat-mixing and foaming: a paper pellet that is a mixture of 35 to 50% by weight of a fine paper powder having a particle diameter of 30 to 200 μm and 50 to 65% by weight of a hydrophilic macromolecule, a total sum thereof being 100% by weight, wherein the hydrophilic macromolecule comprises one of starch, glue, natural rubber, and agar; a recycled resin that is a mixture of 55 to 65% by weight of a recycled polypropylene resin, 30 to 40% by weight of a recycled polyethylene resin, and 1 to 5% by weight of a recycled polystyrene resin, a total sum thereof being 100% by weight; a high melt strength foamable polypropylene resin having a melt tension of a least 5 cN at 230° C.; and water, wherein the paper pellet is 50 to 65% by weight, the recycled resin is 13 to 25% by weight, and the high melt strength foamable polypropylene resin is 10 to 30% by weight, a total sum thereof being 100% by weight, the water is in a range of 10 to 20% by weight to the paper pellet, the recycled resin, and the foamable high melt strength polypropylene resin, the foamed product, which has a foam expansion ratio of 30 to 50 times and a calorific value of substantially 5900 cal/g, is formed by extruding charged materials from a die and passing the extruded materials between rollers to produce tightly connected surfaces of a plurality of rod-like elements, each of the rod-like elements has, on a surface thereof, a skin layer having no bubbles, the skin layer covering an inside foam layer, the skin layer is 15 to 25 μm in average thickness and exhibits an infrared absorption spectral waveform equivalent to that of the foam layer, and voids are formed between the rod-like elements, the voids forming grooves on substantially planar exterior surfaces of the foamed product.