| 摘要 |
PURPOSE:To obtain stable flame capable of being adjusted very smoothly in terms of flame length by using a flow rate regulation material made of a cylindrical continuously cellular butadiene-acrylonitrile copolymer foam. CONSTITUTION:A flow rate regulation material 9 made of a continuously cellular butadiene-acrylonitrile copolymer foam has a cylindrical form suitable for its insertional setting into a lower chamber 8. Since the butadiene-acrylonitrile copolymer, knows as nitrile rubber usually, has higher elasticity and durability, lesser compression fatigue, more stable elasticity for long time, and larger cellular density, than urethane foam resin, the length of flame can be very smoothly adjusted to form stable flame because the cross sections of the continuous cells formed in the flow rate regulation material very smoothly vary with compression. |
