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
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
  • C03B37/10—Non-chemical treatment
• • 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
  • C03C25/66—Chemical treatment, e.g. leaching, acid or alkali treatment

Definitions

• the vacuum insulation panels are for example mineral fiber panels, compressed and held under vacuum.
• Mineral fibers for vacuum insulation panels must be free of binder to prevent degassing after fabrication, which would prevent vacuum retention. However, it is necessary to wet the fibers to cool the atmosphere in the reception during fiber drawing and thus facilitate the aspiration of fumes, or to lubricate the fibers.
• the sizing ring can be used to bring water to the fibers. Water is then sprayed on the fibers already formed, before reception on the carpet receiving fibers. Fibers fall wet on the receiving mat.
• the mineral fibers are as dry as possible. Also, after receiving them on the receiving mat, they are passed through at least one oven to dry before they can be used in a vacuum insulation panel. However, the passage in an oven is expensive in energy.
• the invention proposes a device for manufacturing inorganic fibers by internal centrifugation, comprising:
• centrifuge adapted to form mineral fibers by fiberizing from molten mineral material
• At least one ring adapted to spray water on the mineral fibers in formation.
• a ring is disposed between 150 and 300 mm under the centrifuge and / or a ring is disposed just above the centrifuge.
• the water spray angle by the ring disposed under the centrifuge is between -45 ° and + 45 ° relative to the horizontal, preferably between -30 ° and + 30 °.
• the water spray angle by the crown disposed above the centrifuge is vertical or inclined at an angle less than or equal to 20 ° from the vertical to the axis of symmetry of the centrifuge.
• the total amount of water spray is between 5 L / h and 400L / h, preferably between 100 L / h and 250L / h.
• the total amount of water spray is between 5 and 550 L per ton of glass.
• the amount of water sprayed by the ring disposed above the centrifuge is between 0% and 80% of the total amount of water and the amount of water sprayed by the ring disposed under the centrifuge is between 20% and 100% of the total amount of water.
• the ring disposed above the centrifuge is adapted to blow compressed air simultaneously with the water spray.
• the water spray is atomized water.
• the invention also relates to a process for manufacturing mined fibers by centrifugation using the device described above, comprising the following steps:
• the invention also relates to a method of manufacturing vacuum insulating panels, comprising the following steps:
• the invention also relates to a product obtained by the process described above, comprising a moisture content of less than 0.1% after manufacture, without passing through an oven.
• the product has a punching force of between 500 and 800 N.
• the product is packaged in a sealed package, the package containing a desiccant material in an amount preferably less than 1 g per kg of product.
• the figure shows a sectional view of the mineral fiber manufacturing device according to the invention.
• “Below” are defined in fibering position when the centrifuge is in the fiberizing position, that is to say when the axis of rotation of the centrifuge is along a vertical axis.
• the invention relates to a device for manufacturing mineral fibers by centrifugation, comprising an internal centrifugation device adapted to form mineral fibers from molten mineral material and at least one ring adapted to spray water, preferably atomized. , on mineral fibers during fiber drawing, during their formation.
• FIG. 1 represents a device for manufacturing mineral fibers according to the invention.
• the device comprises a centrifuge 1, also called pitching plate, having an annular wall 10 pierced with a plurality of orifices 1 January.
• the annular wall 10 is extended, to form the top of the centrifuge 1, by a web 13 ending in a tulip 14.
• the device also comprises a hollow shaft 2 and shaft 9, adapted to be rotated by a motor (not shown).
• the centrifuge 1 is fixed to the shaft 2 via the tulip 14.
• the axis 9 is vertical.
• the shaft 2 is connected to means for supplying molten glass.
• the shaft 2 is connected either to a basket 3 if the centrifuge has no bottom, or directly to the centrifuge 1 in the case of a centrifuge with a bottom.
• the basket 3 is located inside the centrifuge 1.
• the basket 3 comprises an annular wall 30 pierced with a plurality of orifices 31.
• the centrifuge 1, the shaft 2 and possibly the basket 3 are rotated about the axis 9 of the shaft 2.
• Molten glass flows into the shaft 2, from the molten glass supply means to the centrifuge, in which the molten glass is spread.
• the molten glass flows to the basket 3 and is projected onto the annular wall 30 of the basket, passes through the plurality of orifices 31 of the basket and, in the form of bulky filaments 5 , is projected onto the peripheral wall 10 of the centrifuge 1.
• a permanent reserve of molten glass is then formed in the centrifuge to feed the plurality of orifices 1 1 pierced in the annular wall 10 of the centrifuge 1. Melted glass passes through the plurality of orifices 1 1 of centrifuge 1 to form flow cones 6 extending forward of fibers 7.
• the mineral fiber forming device also comprises at least one annular burner 4 generating a gas stretching jet at high temperature.
• the gaseous draw jet is a high temperature gas stream, which leaves the annular burner 4 via its exit 40 provided with lips 41, so that the gaseous drawing jet is substantially tangential to the annular wall 10 of the centrifuge 1 .
• the outlet 40 of the annular burner 4 is situated above the annular wall 10 of the centrifuge 1.
• the gaseous drawing jet makes it possible to heat both the annular wall 10 of the centrifuge 1 and the fibers in the form of at the exit of the centnugger 1.
• the fore fibers 7 stretch, their end portion generating discontinuous fibers 8, which are then collected on a receiving belt (not shown) under the centrifuge 1.
• No binder is used to produce the product according to the invention; the mineral fiber forming device has no sizing device, in particular no sizing ring.
• the mineral fiber forming device also comprises at least one ring 16, 17 which sprays water, preferably atomized, onto the forming fibers.
• the fibers in formation are the fibers which are not completely solidified.
• a ring 16 is disposed just above the centrifuge and / or a ring 17 is disposed under the centrifuge.
• Each ring 16, 17 is substantially horizontal and has a plurality of atomized water outlet ports.
• the orifices of the ring 16 disposed just above the centrifuge 1 are oriented downwards and arranged at the same height as the lips 41 of the burner gas outlet 4.
• the water atomized by the ring 16 is sprayed vertically or with an inclination towards the axis 9 of the centrifuge.
• the angle ⁇ of spray is between 0 ° and + 20 ° relative to the vertical.
• the disposition of the ring 16 and the orientation of the atomized water jet are such that the atomized water is sprayed onto the forming fibers, that is to say the discontinuous fibers 8 not yet solidified.
• the orifices of the ring 17 disposed under the centrifuge 1 are oriented more or less horizontally.
• the ring 17 is arranged such that its orifices are situated at a distance of between 100 and 300 mm from the bottom of the centrifuge 1, preferably between 150 and 300 mm from the bottom of the centrifuge 1, or at a distance of between 350 and 500 mm from the lips 41 of the burner 4.
• the atomization angle a atomized water atomized by the ring 17 is between -45 ° and + 45 ° relative to the horizontal, preferably between -30 ° and + 30 ° , more preferably between 0 ° and + 45 °, or between 0 ° and + 30 °, that is to say preferably horizontally or upwards.
• the ring 17 and the angle of spray of its orifices are such that the atomized water is sprayed on the fibers in formation, that is to say the discontinuous fibers 8 not yet fully solidified.
• the total amount of water is between 5 L / h and 400L / h, preferably between 100 L / h and 250L / h.
• the total amount of water spray is preferably between 5 and 550 L of water per tonne of glass.
• the amount of water pulverized by the ring 16 disposed above the centrifuge device is between 0% and 80% of the total amount of water and the amount of water sprayed by the ring 17 disposed under the centrifuge is between 20% and 100% of the total amount of water.
• the temperature at the ring 16 disposed above the centrifuge 1 is of the order of the temperature of the gases leaving the burner at the lips, that is to say for example around 1400 ° C. .
• the temperature at the crown 17 is between 650 ° C and 1100 ° C.
• the atmosphere in which the water is sprayed is thus very hot, which allows that contact with forming fibers, themselves very hot, the water evaporates almost instantly.
• the fibers then arrive dry, that is to say with a moisture content of less than 0.1% on the receiving belt.
• water is sprayed on the fibers already formed in a saturated humidity atmosphere where the temperature is about 200 ° C.
• the fibers arrive so wet on the carpet of reception.
• the device according to the invention makes it possible to manufacture a dry product which avoids the use of an oven and thus makes it possible to save energy.
• Spraying or vaporizing atomized water in a very hot atmosphere creates water vapor, which cools the atmosphere and facilitates the aspiration of the fibers to the receiving mat and thus improves the distribution of the fibers. on the reception mat.
• the spraying or vaporization of atomized water on very hot fibers in formation allows a quenching of the fibers.
• This makes it possible to improve the mechanical properties of the fibers, in particular the stamping property.
• This makes it possible to improve, for the same density, the resistance of the vacuum insulation panels to the vacuum. This also improves the thermal conductivity of the vacuum insulation board.
• the stamping property is measured according to the following protocol: it rolls in the form of cigar 4g of fibers, it is introduced into a cylindrical cell. A rod is then introduced into the cylindrical cell which compresses the fibers by compression. We then measure a punching force of the fibers in Newtons. The punching force of the products obtained by the process according to the invention is between 500 and 800N.
• the moisture content is measured according to the following protocol: three surface test specimens in section 305 mm x 305 mm are prepared. Each test piece is weighed and its initial mass P, n i is noted. The test pieces are passed to the oven at 180 ° C. for 30 minutes and then to the desiccator for 1 hour. Each test piece is weighed again and its final mass Pf, n . For each test piece, the moisture content is: (P, n i - Pfin) / Pfin-
• the ring 16 disposed above the centrifuge 1 allows, in addition to spraying water, to blow compressed air. Blowing compressed air avoids dispersion of the fibers too far from the axis 9 of rotation of the centrifuge 1.
• the mineral fiber-forming device also optionally includes an induction ring 20 under the centrifuge and / or an internal burner for heating the lowest zone of the centrifuge and avoiding or limiting the creation of a temperature gradient. on the height of the centrifuge.
• the invention also relates to a process for manufacturing mineral fibers by centrifugation using the device as described above, comprising the following steps:
• the mineral fibers are, for example, bagged, preferably under a primary vacuum, or even under a secondary vacuum, where appropriate with insertion of a desiccant material into the package, preferably in an amount of less than 1 g per kg of product.
• the product obtained by the process according to the invention comprises less than 0.1% moisture after manufacture, without passing through an oven.
• the product obtained has a moisture content of 0.05% and a punching force of 650 N.
• the product according to the invention is therefore a dry product, which is not the case for products made in standard, with reinforced mechanical properties.

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

Applications Claiming Priority (2)

Publications (1)

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• 2013
  • 2013-05-07 FR FR1354156A patent/FR3005465B1/fr active Active
• 2014
  • 2014-05-06 EP EP14729395.5A patent/EP2994431A1/fr active Pending
  • 2014-05-06 KR KR1020157031647A patent/KR102311594B1/ko active IP Right Grant
  • 2014-05-06 WO PCT/FR2014/051063 patent/WO2014181063A1/fr active Application Filing
  • 2014-05-06 US US14/889,465 patent/US20160115071A1/en not_active Abandoned
  • 2014-05-06 CN CN201480025483.9A patent/CN105189382B/zh active Active
  • 2014-05-06 MY MYPI2015703986A patent/MY183064A/en unknown
  • 2014-05-06 JP JP2016512406A patent/JP6606065B2/ja active Active
• 2019
  • 2019-05-20 JP JP2019094288A patent/JP2019172571A/ja active Pending

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