| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-quality integrated material which can be manufactured very easily at a low cost and further, is lightweight and ensures the durable strength. SOLUTION: A plurality of constituent bar-like bodies (1) extruded in a foam state from a die (D) by an extrusion molding means are integrated and a high-density layer (12) is formed by monolithically melting the bar-like bodies (1) when the bar-like bodies (1) are integrated. In addition, a high-density part (10) is formed by sizing on the outer peripheral surface. Thus a high-density skeleton (13) consisting of the high-density layer (12) and the high-density part (10) is formed as a foamed integrated material.
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