Abstract:
A method of monitoring one or more growing plants comprising: (i) providing at least one plant in a growth substrate which contains water, (ii) providing a monitoring system comprising (a) a first data storage means containing stored data on the optimum water oxygen levels for at least one, preferably at least two, sets of growth conditions and (b) a first calculating means for comparing input actual growth conditions and actual water oxygen levels with the stored data and producing a first output result and (c) input means for supplying to the monitoring system actual growth conditions and actual water oxygen levels, the process comprising: (iii) measuring the actual water oxygen level in the region around the roots of the at least one plant, (iv) providing the actual water oxygen level to the first calculating means, (v) determining at least one growth condition and supplying the growth condition to the first calculating means, whereby (vi) the first calculating means compares the actual water oxygen level and the at least one growth condition with the stored data and provides the first output result. The invention also provides a monitoring system, which is preferably an oxygen sensor system, for use in this method, and methods of growing plants using this monitoring method.
Abstract:
Process for providing a binder for mineral wool products, said process comprising the steps of: mixing together under reactive conditions a carboxylic acid with an alkanolamine, whereby optionally these are firstly mixed to provide a resin, which resin is subsequently reacted with a separate carboxylic acid group containing polymer.
Abstract:
The invention relates to a plant growth substrate, comprising a coherent, hydrophilic matrix of mineral wool fibres mutually connected via binder based on furan resin, and to use of a coherent, hydrophilic matrix of mineral wool fibres mutually connected via binder based on furan resin, as a plant growth substrate.
Abstract:
The invention relates to an arrangement for cleaning a wool chamber in the manufacture of mineral wool. In the manufacture of mineral wool a binder is added to the stream of fibers which is deflected towards the wool chamber and the binder deposits itself in fine droplets in the fibers. The binder-laden fibers which touch against the walls and roof of the wool chamber adhere to them because the binder hardens upon contact with the hot surfaces. Gradually a hard deposit of binder and fibers is formed upon the walls. According to the invention cleaning of the walls is substantially simplified by means of making the walls and/or roof of a double walled construction, perforating the inner walls and applying a reduced pressure in the cavity between the walls holding a detachable lining against the inner walls by means of suction. When the lining has become coated with deposits of binder and fibers to a certain thickness production is halted and the reduced pressure is broken off whereon the detachable lining together with the deposits falls off and a new detachable lining is applied.
Abstract:
The invention relates to stone wool formed from stone melt and consisting of 70 to 90% by weight stone wool fibers having diameters of up to 5 .mu.m, 0 to 5% by weight stone wool fibers having diameters above 5 .mu.m, and 10 to 25% by weight shot having a diameter of at least 63 .mu.m, and in which the average diameter of the fibers is from 1 to 4 .mu.m, the ratio of average fiber length:average diameter is 1,000 to 3,000, wherein the stone wool has a density from 12 to 85 kg/m.sup.3 and thermal conductivity lambda values from 30 to 40 mW/m.degree.K at 10.degree. C.
Abstract translation:本发明涉及由石熔石形成的石棉,由直径大于5微米,直径大于5微米的0至5重量%石棉纤维的70至90重量%的石棉纤维组成,10至 25重量%的直径为63μm以上的纤维的平均直径为1〜4μm,平均纤维长度平均直径的比例为1000〜3000,其中,石棉 密度为12至85 kg / m3,导热系数λ值为10至30 mW / m K。
Abstract:
Asbestos cement may be converted to a harmless product by melting at a melt temperature of 1400.degree. to 1700.degree. C. a blend of 50 to 85% by weight asbestos cement with 15 to 50% by weight of additives that include naturally occurring silicate material such that the total blend has a CaO content of not more than 50%. The melt is discharged from the furnace, cooled and solidified and may be used as aggregate or, generally after solidification as regular units, may be used as part or all of the charge for producing MMV fibre material. It is of particular value for the production of man made vitreous fibre material that has low alumina content and is soluble in lung fluids.
Abstract:
A product comprising man made vitreous fibers formed of a composition which comprises, by weight of oxides:______________________________________ SiO.sub.2 45-60% Al.sub.2 O.sub.3 0.5-4.0% TiO.sub.2 0.1-4% FeO 6-12% CaO 10-25% MgO 8-18% Na.sub.2 O 0-2.5% K.sub.2 O 0-2% Na.sub.2 O + K.sub.2 O 0-6% P.sub.2 O.sub.5 3-10% ______________________________________ wherein the product has a sintering temperature of at least 950.degree. C. and wherein above 50% by weight of the iron is present as ferrous.
Abstract:
A mineral fibre containing plant growing medium comprising lignite has ion exchange capacity and improved water retention properties and does not require disinfection before use.
Abstract:
The invention relates to fiberizing apparatus for forming mineral wool and a process using that apparatus. The apparatus comprises a set (1) of at least three rotors mounted for rotation about respective horizontal axes. Melt is poured onto the top rotor (4) and thrown onto subsequent rotors in turn (5, 6 and 7) with the result that fibres are thrown off. The rotors all rotate to give an acceleration field of at least 50 km/s.sup.2, and are spacially arranged in respect to one another so that a line drawn from the axis of the first rotor (4) to the axis of the second rotor (5) makes an angle (C) of 0-20.degree. below the horizontal.
Abstract:
Apparatus for the formation of mineral wool fibres comprising a set of rotors (1) mounted on a front face (2) of a housing (3) wherein a rotor (5, 6, 7) has associated with it an air supply slot (8, 9, 10) for discharging an air blast close to the periphery of the rotor with an axial component for carrying off the mineral wool fibres and wherein the air slot has direction means (25) to direct the air at an angle to the axial direction that varies along the length of the slot.