Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
  • C03B37/01—Manufacture of glass fibres or filaments
  • C03B37/04—Manufacture of glass fibres or filaments by using centrifugal force, e.g. spinning through radial orifices; Construction of the spinner cups therefor
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
  • C03C25/10—Coating
  • C03C25/12—General methods of coating; Devices therefor

Definitions

• the invention relates to an apparatus for the defibration of molten mineral material, comprising successive centrifuge wheels rotating at high speed; means for directing a gas flow along the circumferential surfaces of the centrifuge wheels for separating fibers from the molten mineral material passed on to the circumferential surfaces and for guiding the fibers to a collecting point; and a bonding agent spraying means for adding a bonding agent to the fibers.
• Patent Specification 937,364 The bonding agent is therein introduced into a spraying means positioned at the end of the centrifuge wheel through the shaft of the centrifuge wheel, whereby the centrifugal force 0 causes the bonding agent drops to be thrown from the nozzles of the spraying means on fibers flowing past.
• the apparatus disclosed in the German publication comprises a mushroom-shaped spraying means which is attached to the end of the centrifuge wheel at the 5 base portion thereof.
• the diameter of the spraying means is considerably smaller than the diameter of the centrifuge wheel.
• the spraying means of the Sovjet publication is conical and attached to the end of the centrifuge wheel at the end having a smaller diameter.
• the diameter of the spraying means is clearly smaller than that of the centrifuge wheel.
• the spraying means of both these publications are merely designed to provide the best possible spraying of the bonding agent, and the appearance of the spraying means is determined by this purpose. These spraying means are not even intended to affect the flow of the fibers passing by. Even though these means effect an even spraying of the bonding agent, this alone does not ensure that the bonding agent adheres properly to the fibers, as the fiber flow is usually uneven outside the circumferential surface of the centrifuge wheel.
• the object is to provide a new apparatus which avoids the prior problems and enables the bonding agent to be mixed up with the fibers, i.e. to be adhered thereto, evenly and in a controlled manner.
• an apparatus which is mainly characte ⁇ rized in that in order to provide a controlled mixing of the bonding agent with the fibers a fiber flow controller positioned in the direction of the flow of the fibers is arranged at the end of the centrifuge wheel adjacent to the spraying means of the bonding agent, whereby the controller further defines a gap for directing the bonding agent drops from the spraying means to fibers flowing by.
• the invention is based on the idea that the circumference of the centrifuge wheel, from which the molten material is thrown, is provided with an extension part so shaped that the gas flow containing the fibers will have a desired flow profile and that the bonding agent drops, prefereably produced by means of a small diameter spraying means, are directed 5 outwards in a controlled manner at least essentially up to the circumference of the centrifuge wheel, wherefrom they are mixed with the fibers.
• a flow field of the gas flow containg the fibers is created around the fiber flow controller positioned in the direction
• the obtained product is of higher quality.
• the flow controller prefereably comprises two portions, a gap being defined therebetween for the passage of the bonding agent, and prefereably at
• FIG 1 shows one preferred embodiment of the apparatus according to the invention.
• Figure 2 shows another embodiment of the appara- tus according to the invention.
• Figure 1 shows one of the centrifuge wheels of a mineral wool defibrator, which wheel is designated by the reference numeral 1.
• a molten material mineral 2 is thrown from a circumferential surface 8 of the centrifuge wheel 1 rotating at high speed.
• a fan 3 is arranged around the circumference of the centrifuge wheel at one end of the centrifuge wheel to provide a forceful air flow A which is directed along the circumferential surface of the centrifuge wheel in the axial direction of the wheel.
• a calotte- shaped flow controller 7 tapering in the direction of the air flow A and the fibers 5 and comprising two parts 7a and 7b is arranged at the opposite end of the centrifuge wheel.
• a circumferential surface 9 of the first part 7a adjoins the circumferential surface 8 of the centrifuge wheel.
• a gap 10 is defined between the parts 7a and 7b of the controller, through which gap the centrifugal force causes the bonding agent drops 6 to be directed to the fibers 5 flowing by.
• a bonding agent spraying means 4 sending the bonding agent drops 6 ispositioned within the first part 7a of the flow controller so as to be in communication with the gap 10, whereby the bonding agent is introduced into the spraying means through the rotary shaft of the centri ⁇ fuge wheel and the diameter of the spraying means is preferably essentially smaller than that of the centri ⁇ fuge wheel. If the flow controller 7 were a one-piece part, the gap 10, into which the bonding agent spraying means 4 opens, would be positioned immediately after the centrifuge wheel (in Figure 1 between the parts 1 and 7a) .
• the air flow A takes therewith those particles of the molten material 2 which are to be converted into fibers 5 and passes them towards the other end of the centrifuge wheel, where they enter a bonding agent cload formed by the bonding agent drops intro ⁇ quizd through the gap 10 from the bonding agent spraying means 4 under the influence of the centrifugal force.
• the calotte-shaped flow controller 7 rotating with the centrifuge wheel creates around it a flow field of the blast air A, which field is such that the fibers 5 are caused to pass close to the surface of the flow controller in good order. In this way the fibers are prevented from being carried past the bonding agent cload nor do they form clusters as a result of which only part of the fibers would get ' in contact with the bonding agent.
• FIG. 2 The apparatus according to Figure 2 is similar to that of Figure 1 with the exception that a flow controller 7' attached to a centrifuge wheel 1' is formed by two truncated cones 7a' and 7b 1 of which one cone 7b' has a sharper conical angle.

Landscapes

• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Manufacturing & Machinery (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Manufacture, Treatment Of Glass Fibers (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8522823

Family Applications (1)

Country Status (6)

Cited By (2)

Families Citing this family (1)

Citations (10)

• 1986
  • 1986-06-23 FI FI862656A patent/FI862656A0/fi not_active Application Discontinuation
• 1987
  • 1987-06-23 EP EP19870904260 patent/EP0312535A1/en not_active Withdrawn
  • 1987-06-23 AU AU75881/87A patent/AU7588187A/en not_active Abandoned
  • 1987-06-23 JP JP50391587A patent/JPS63503537A/ja active Pending
  • 1987-06-23 WO PCT/FI1987/000086 patent/WO1987007887A1/en not_active Application Discontinuation
• 1988
  • 1988-02-09 DK DK067088A patent/DK67088A/da not_active Application Discontinuation

Patent Citations (10)

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