Heat treatment equipment, especially for heating an optical glass fiber preform, comprises a heating chamber with a top inlet, a bottom outlet and one or more side burner openings

摘要

Heat treatment equipment, comprising a heating chamber (3-5) with a top inlet, a bottom outlet and one or more side burner openings (10, 11), is new. Preferred Features: The or each burner units (12, 13) is operated with oxygen and hydrogen, natural gas, acetylene, butane, methane or propane.