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device and method for manufacture of an early form of dismantling the monopoly of public television
device and method for manufacture of an early form of dismantling the monopoly of public television
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机译:装置的制造方法和方法,以消除公营电视的垄断
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摘要
The invention relates to a device for manufacturing a preform, wherein a carrier tube is collapsed to a preform, which device comprises a heating element forming a cylindrical envelope, which envelope defines an annular inlet opening and an annular outlet opening at opposite ends of the envelope, a carrier tube being present within the cylindrical envelope, between said openings, the heating element being movable in axial direction with respect to the carrier tube, and means for supplying a non-oxidizing gas to the space between the carrier tube and the envelope.
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