Patent ID: 11900900
Assignee: YAMAHA CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC G  B | IPC B  G

Claim 11:
12. A modified wood for use in a musical instrument, the modified wood having an improved internal loss value, the modified wood comprising:
a wood material having a first internal loss value; and
a sappanwood extract component that is impregnated into the wood material, such that after the wood material is impregnated the wood material attains a second internal loss value that is lower than the first internal loss value, wherein
an internal loss of the wood material in a fiber direction is 4×10−3 or more and 12×10−3 or less,
an internal loss of the wood material in a radial direction is 12×10−3 or more and 25×10−3 or less,
an elastic modulus of the modified wood in a fiber direction is 7 GPa or more and 20 GPa or less,
an elastic modulus of the modified wood in a radial direction is 0.5 GPa or more and 2.5 GPa or less,
the sappanwood extract component is a water-extracted and unpurified component, and
the sappanwood extract component has a solid content mass of 8 to 12% of sappanwood.