Rockwool Aktiebolaget

Stellan Dahlberg

Ulf L Aberg

Hans E Brelen

A method is provided for improving the uniformity of the surface weight of a mineral wool mat. The mat is produced from a mineral melt which is converted into fibers, these fibers being introduced into a gas-formed stream providing a transport medium for these fibers. The transport medium and the mineral fibers carried thereby are transported to a moveable collector band on one side of which the mineral wool is deposited so as to form the mineral wool mat, the transport medium being caused to pass through the collector band by means of a fan or the like. The method comprises measuring at least one variable which is characteristic of the transport medium and which varies in relationship to the amount of mineral wool deposited. Examples of such a variable include the pressure drop across the transport medium when passing through the mineral wool mat, the rise in temperature of the transport medium due to heat transfer from the mineral material, and the power supplied to the fan which provides movement of the transport medium. The results of the measuring step are fed to a control device for controlling the speed of movement of the collector band such that the speed of the collector band is varied in direct relationship to the amount of fiber deposited on the collector band, i.e., the greater the amount of fiber, the greater the speed, whereby the mineral fiber material is deposited on the collector band with an evenly distributed surface weight.

Method for determining the surface weight of a mineral wool mat

A continuously running, band-formed or mat-formed material, such as mineral wool, is weighed continuously at a given point, and the sensed weight is used to control the speed of a conveyor arrangement along which the band of material is running. The material is supported and transported along a first driven conveyor and onto a second driven conveyor spaced a short distance from the discharge end of the first conveyor. The first and second conveyors are oriented to form an upwardly concave obtuse angle such that the band of material deforms and bends through an upwardly concave obtuse angle as it passes from the first conveyor to the second conveyor. The band of material is continuously weighed as it passes between the first and second conveyors by passing the deformed and bent band onto and along a third non-driven idler conveyor located between the first and second conveyors and arranged to continuously sense the weight of the band passing therealong. The first and second conveyors are driven at equal speeds, but the speeds are varied in response to weight changes sensed by the third conveyor means. The third conveyor means may be in the form of a roller mounted in the space between the first and second conveyors.

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Tidan, Sweden

Stellan Dahlberg