MAN-MADE VITREOUS FIBRE PRODUCTS AND PROCESSES AND APPARATUS FOR THEIR PRODUCTION

摘要

MMVF products are made by a novel process which uses novel apparatus comprising a centrifugal spinner (1), a chamber (2) which comprises a collecting portion (3) which has a spinner end (4) adjacent to the centrifugal spinner (1) and which extends forwards from the spinner end and which comprises side and top walls (12, 14) and an upwardly inclined based defined by collector (16) mounted to receive fibres blown from the spinner (1) and to carry the fibers as a web out of the chamber (2), and suction means (19) for applying suction through the collector (16), wherein the chamber also comprises a spinner portion (5) which has a rear end (6) which is substantially open to the atmosphere and a front end (7) which opens into and merges with the collecting portion (3), and a substantially tubular duct (8) which extends between the front end (7) and the rear end (6), the collecting portion (3) of the chamber is substantially closed to the ingress of air which is sucked through the tubular duct (8) and optionally, a lesser, non-interfering, amount of the air sucked or forced through supplementary air passages in the spinner end (13) of the collecting portion (3), the front end of the spinner (1) and the front end (7) of the spinner portion (5) together define a substantially open annular collar between them, at least 50% of the cross-sectional area of the front end (7) of the spinner portion is open to the flow of air sucked through the spinner portion by the suction means (19), and the spinner (1) and the tubular duct (5), are constructed to provide substantially steady air flow conditions through the collar. The invention includes a novel spinner which can be used in this apparatus.