Fiber diameter measuring device, inorganic fiber sheet producing device, method for measuring fiber diameter, and method for producing inorganic fiber sheet

A fiber diameter measuring device configured to measure a fiber diameter of an inorganic fiber in an inorganic fiber sheet including the inorganic fiber, the device comprising,

• a sampling section capable of sampling a predetermined amount of the inorganic fiber in an entire area of the inorganic fiber sheet;
• and
• a measuring section configured to measure a fiber diameter of the sampled inorganic fiber.

A method for measuring a fiber diameter measuring a fiber diameter of an inorganic fiber in an inorganic fiber sheet including the inorganic fiber, the method comprising,

• a sampling step of sampling the inorganic fiber from the inorganic fiber sheet by a sampling method capable of sampling a predetermined amount of the inorganic fiber in an entire area of the inorganic fiber sheet;
• and
• a measuring step of measuring the fiber diameter of the sampled inorganic fiber.

A method for producing an inorganic fiber sheet, the method comprising,

• a sampling step of sampling an inorganic fiber from an inorganic fiber sheet by a sampling method capable of sampling a predetermined amount of the inorganic fiber in an entire area of the inorganic fiber sheet including the inorganic fiber;
• and
• a measuring step of measuring the fiber diameter of the sampled inorganic fiber.