US2888060A - Arrangement and method for the production of mats or similar flat formations of mineral wool - Google Patents

Arrangement and method for the production of mats or similar flat formations of mineral wool Download PDF

Info

Publication number
US2888060A
US2888060A US660278A US66027857A US2888060A US 2888060 A US2888060 A US 2888060A US 660278 A US660278 A US 660278A US 66027857 A US66027857 A US 66027857A US 2888060 A US2888060 A US 2888060A
Authority
US
United States
Prior art keywords
conveyor
mineral wool
motor
arrangement
mats
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US660278A
Other languages
English (en)
Inventor
Kjell-Berger Sven Olof Kjell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rockwool AB
Original Assignee
Rockwool AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rockwool AB filed Critical Rockwool AB
Application granted granted Critical
Publication of US2888060A publication Critical patent/US2888060A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D04H1/4218—Glass fibres
    • D04H1/4226—Glass fibres characterised by the apparatus for manufacturing the glass fleece
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/64—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions

Definitions

  • Mats of spun mineral wool are employed, particularly within the building industry, for a variety of insulation purposes.
  • the mats are commonly bound together with sewing, the body of the mat comprising mineral wool spun from glass fiber, from molten stone, or similar material.
  • fine fibrous particles are spun from a machine which uses the mineral in molten form to spin a mass of particles which are known in bulk as mineral wool.
  • the fibrous particles are extruded upon a slowly moving conveyor on which they are compressed into a mat, enclosed between two strips of impregnated paper, the strips being sewn together to form the bound mat.
  • the mass of mineral particles is also commonly subjected to treatment with an oil of low volatility, with a plastic resin, or some other binding material which is intended to impregnate and bind the particles into a more coherent mass.
  • the mineral material to be used in spinning the fibrous particles is normally molten into a thin liquid consistency.
  • a cupola furnace is often used. The ovens are charged in layers of the mineral and of the fuel. As the fuel burns, the mineral charge becomes molten, Stratification takes place, and the charge is released in the form of a thin jet Within the spinning machine.
  • the quantity of mineral charge supplied to the spinning machine for unit of time is dependent upon conditions within the furnace, such as the amount of charge in a molten state as compared with that remaining in a somewhat semi-molten state. Other conditions are also significant, such as unevenness in the original charge which causes irregularity in the supply of molten material to the spinning machine.
  • the aforementioned disadvantages are overcome by regulating the speed of the conveyor in relation to the power consumed by the spinning machine.
  • the invention is predicated upon the observation that the power consumed by the spinning machine varies in accordance with the quantity of mineral wool extruded by the machine. Variances in power consumption are of such magnitude as to permit their measurement and the regulation of the speed of the conveyor accordingly.
  • the volume weight of the mineral wool mat per unit length of the conveyor is maintained at a substantially constant value.
  • control apparatus for regulating the speed of the conveyor in relation to the power consumed by the spinning machine is mounted along the feeder circuits leading to the electrical power means for the spinning machine.
  • Figure 1 shows diagrammatically the overall arrangement of the invention.
  • Figure 2 shows, diagrammatically also, an arrangement ofthe speed control means as indicated at 31 in Figure 1.
  • the instant invention is not limited to use with any one kind of spinning machine.
  • Many different kinds of spinning machines, tested in accordance with the present invention have demonstrated the property of their power consumption varying closely linearly with the amount of mineral wool extruded from the spinning machine per unit of time.
  • the invention is applied in connection with a spinning machine having rotating wheels, from the surface of which the mineral is expelled in the form of wool particles. But the invention is nevertheless applicable 'with all kinds of spinning machines which are commonly employed in practice'for the production of mineral wool.
  • the invention also contemplates simultaneous control of the feed of the many kinds of impregnating materials, or the various other operations which etfect the uniformity of the wool mat.
  • 10 indicates a cupola furnace in which the mineral is melted down to be spun into the wool.
  • the mineral is charged in layers 11, 12, and 13, alternate to layers of fuel 14, 15, and 16.
  • Forced air is fed through an inlet 17 for supporting combustion.
  • a melt 18 is collected in the bottom of the furnace and released through outlet 19 in the form of a freely falling jet 20.
  • the jet 20 falls into the spinning machine generally indicated at 21.
  • the spinning machine 21 comprises a number of wheels which rotate with different speeds. The wheels are so arranged that the jet 20 hits a first wheel moving at a low speed, from which the melt is thrown over to a second wheel moving at a higher speed, and finally to a third wheel moving at a still higher speed. Only the first and third wheels are visible in Figure 1 at 22 and 23, respectively.
  • the spinning machine 21 may be driven by a single motor or by a plurality of motors.
  • the machine is driven by two separate motors 24 and 25, motor 24 driving the spinning wheel 22 and the second spinning wheel not shown in the figure, over a power transmission 26, the second motor 25 driving the third spinning wheel 23 over a power transmission 27 r '
  • the motors themselves are actuated through 3-phase'current over feeding lines 28 and 29 which in turn are fed from a main 30through assaoeo the control apparatus 31, which is dealt with ingreater detail in Figure 2.
  • control apparatus 31 functions so as to measure the amount of power fed over the conduits 28 and 29 to the motors 24 and from the main 3%. In relation to this power value, control apparatus 31 regulates the voltage value or some other suitable value on an output control conduit 32, over which a motor 33 is fed with current from a direct current network 34.
  • a cascade of spun mineral wool 35 is deposited on a conveyor 36 moving in the direction of the arrow 37 under the influence of the motor 33.
  • a mat 38 of mineral Wool is built up on the conveyor 36, and the resultant mat is compressed by means of a loaded roller 39.
  • the compressed mat is transferred to a second conveyor 40 driven through a power transmission not shown in the drawing synchronously with the conveyor 36.
  • Belt driving may be arranged between the shaft for the last support roller 41 of the first conveyor 36 and the first support roller 42 of the second conveyor
  • the formed mineral wool mat is transferred to the second conveyor ll with constant thickness and without any tendency to displace in a horizontal direction such that it would be further compressed or torn apart.
  • Conveyor 40 carries the wool mat to a point where the later operations for forming the bound mat are accomplished. These operations do not form any part of the instant invention.
  • Control apparatus 31 functions so as to regulate the speed of the motor 33 in relation to the consumption of power of the motors 24 and 25 driving the spinning machine 21.
  • Motor 33 drives the conveyor 36 and indirectly the conveyor 46. Regulation of the speed of the conveyor occurs in such a way that the rate at which the mat 38 builds up on the conveyor is adapted to the quantity of mineral wool deposited from the spinning machine such that after compression to a uniform thickness the mat 38 will also have a substantially constant volume weight.
  • Binder material is also introduced in the spinning machine to the mineral wool mass. Moreover, the amounts of binder material fed to the mass are similarly fed in relation to the power consumption of the spinning machine. Normally the binder material is fed as a shower distributed through the hollow shafts of the spinning t /heels 22 and 23. In the arrangement according to Figure 1, the material is fed to these shafts at their left end by means of flexible piping 43 and 44, the pipes themselves being fed by means of a pump 45 driven by the motor 46. The speed of the motor 46 is also regulated oil of the output control. conduit 32.
  • control apparatus 31 A preferred embodiment of the control apparatus 31 itself shall now be described with reference to Figure 2.
  • Schematically shown at 47 is a 3-phase motor, which may be the only motor or one of several motors driving the spinning wheels.
  • the motor 47 is fed with current over the 3-phnse conductor 48 which represents schematically the 3-phase conductors 28 and 29 shown in Figure l.
  • the primary winding of a current transformer $9 is connected into one of the phase conductors, and the secondary winding is connected to the worker winding 50 of an ampere metrical control instrument, the pointer 52 of which is turnable about the shaft 51.
  • the pointer 52 supports a screen 53 of an appropriate arc length. This screen is positioned between two discs 54 and 55 which are turnable about a shaft 51" co-axial with the shaft 51 but mechanically free from shaft 51'.
  • Each of the discs 54 and 55 contains an arc-shaped slot or opening 56 and 57 respectively, the arc radius of the slots being substantially the same as that of the screen 53.
  • On the far side of the disc 55 are two sources of light having optics 60 and 61 directing concentrated beams of light perpendicular to the disc 54 and 55 and to the screen 53.- Normally the screen 53 lies in the path of these beams of light such that the beams are prevented from striking a pair of photoelectric cells 58 and 59.
  • the screen 53 is displaced to one side or the other, either the beam of light from the source '69 will hit the photoelectric cell 53 or the beam from source 61 will hit the photoelectric cell 59.
  • the photoelectric cells 58 and 59 are each connected to one of a pair of DC. current amplifier electronic tubes 62 and 63 which straddle a common bias battery 64 connected into the grid-cathode circuit, or some other suitable source of bias voltage of such a magnitude that when the photoelectric cells are unstimulated, the electronic tubes will be non-conductive.
  • a common bias battery 64 connected into the grid-cathode circuit, or some other suitable source of bias voltage of such a magnitude that when the photoelectric cells are unstimulated, the electronic tubes will be non-conductive.
  • relays 65 and 66 respectively, connected to be actuated when the electronic tubes become conductive.
  • a reversible motor 67 for the sake of simplicity drawn as a direct current motor with two magnetizing windings 68 and 69 coupled in opposite directions, is connected to the mains over one of the contacts 70 and 71 on the relays 65 and 66 such that the motor will rotate in one direction when the tube 62 is conductive and the relay 65 is actuated.
  • the motor 67 will rotate in the opposite direction when the tube 63 is conductive and the relay 66 is actuated.
  • Through a gear 7%" with a large gear ratio the motor 67 is connected to the transmitter '71" in a Selsyn system, the three condoctor system of which is indicated at 72.
  • This three conductor system feeds two different motors, first, a Selsyn motor 73 which through a gear 74 turns the discs 54 and 55, and second, a second Selsyn motor 75 which through a worm gear 76 sets a speed control resistor 77 and 78 for the motor 33.
  • the motor 33 is that shown in Figure l for driving the conveyor 3640.
  • the shaft of the worm gear 7 6 is combined with a control arm 77 for the speed control resistor 78 which is connected in the circuit of the motor 33.
  • the receiver 75 is turned in such a direction that the resistance 78 is decreased whereby the speed of the motor 33 is increased correspondingly.
  • the receiver 73 simultaneously is turned in such a direction that the discs 54 and 55, together with the light sources 60 and 61 and the photoelectric cells 58 59, are reset in the direction in which the arm of the pointer of the ampere metrical instrument had been turned the moment before. This movement continues until both of the light beams are again screened by screen 53, the tube 62 thus becoming non-conductive once more, the relay 65 being released, the contact 7 0 opening again, the motor 67 stopping, and the Selsyn system having again resumed a state of balance.
  • the motor 33 will rotate with a somewhat higher speed corresponding to the higher consumption of power by the spinning Wheel motors and the increased quantity of spun mineral wool deposited on the conveyor, such that the volume weight of the mineral wool mat remains substantially constant at all times along the length of the conveyor.
  • the operation occurs in a somewhat opposite fashion.
  • the beam of light from the light source 61 strikes the photoelectric cell 59, the tube 63 becomes conductive, and the relay 66 is actuated.
  • the motor 67 rotates in a direction opposite to that occurring with an increase in consumption, and the whole Selsyn system is activated in the opposite direction.
  • the resistor 78 is reset in such a direction that the motor 33 undergoes a decrease in speed, and the discs 54 and 55 are turned in the opposite direction until the screen 53 again obstructs the beam of light from the light source 61 such that it does not reach the photo electric cell 59. Thereafter, the whole arrangement assumes a state of balance adapted to the new speed of feeding the spun mineral wool to the conveyor.
  • a method of producing mats of mineral wool having substantially constant volume-weight comprising the steps of feeding a molten mineral mass to a spinning machine, allowing the spun wool particles to be deposited on a conveyor, uniformly compressing the mass of particles thus deposited, and controlling the speed of said conveyor in relation to the variations in power consumed by the spinning machine such that the volume-weight of wool per unit length of said conveyor remains substantially constant.
  • a method according to claim 1 further including the step of controlling the amount of binding material fed to said machine in relation to the power consumed by said machine.
  • An arrangement for producing mats of mineral wool having substantially constant volume-weight comprising means for producing a molten mineral mass, a
  • An arrangement according to claim 4 further comprising means for feeding binding material to said machine, said regulating means also regulating the amounts of said material fed to said machine in relation to the power consumed by said machine.
  • control means comprises at least one light source, at least one photoelectric cell, means for preventing light from said source from reaching said cell, said preventing means being displaceable by said measuring means, and means for adjusting the resistance in-the feeder circuits for said driving means when said preventing means is displaced.
  • said last named means also includes means for realigning said preventing means with said source and said cell so as to prevent light from reaching said cell again.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Nonwoven Fabrics (AREA)
US660278A 1956-05-23 1957-05-20 Arrangement and method for the production of mats or similar flat formations of mineral wool Expired - Lifetime US2888060A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE351892X 1956-05-23

Publications (1)

Publication Number Publication Date
US2888060A true US2888060A (en) 1959-05-26

Family

ID=20308658

Family Applications (1)

Application Number Title Priority Date Filing Date
US660278A Expired - Lifetime US2888060A (en) 1956-05-23 1957-05-20 Arrangement and method for the production of mats or similar flat formations of mineral wool

Country Status (5)

Country Link
US (1) US2888060A (fr)
CH (1) CH351892A (fr)
DE (1) DE1087508B (fr)
FR (1) FR1175668A (fr)
GB (1) GB822528A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250602A (en) * 1961-12-08 1966-05-10 Owens Corning Fiberglass Corp Method for continuously wrapping formed filaments of a rotor about an internal core
US3539316A (en) * 1967-07-25 1970-11-10 Owens Corning Fiberglass Corp Method and apparatus for manufacturing fibrous structures
EP0005416A1 (fr) * 1978-04-28 1979-11-14 Rockwool Aktiebolaget Procédé pour l'amélioration du maintien constant du poids par unité de surface d'un matelas de laine minérale
US5595584A (en) * 1994-12-29 1997-01-21 Owens Corning Fiberglas Technology, Inc. Method of alternate commingling of mineral fibers and organic fibers
EP2272808A1 (fr) * 2009-06-24 2011-01-12 Paroc Oy Ab Procédé et agencement pour optimiser l'alimentation de la liaison dans un appareil de fibrage formant des fibres minérales et produit logiciel

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK94501C (da) * 1959-10-02 1962-10-08 Kaehler & Co I Fremgangsmåde til nedsættelse af forbruget af bindemiddel eller forøgelse af styrken eller begge dele af måtter, batts eller stive plader af mineraluld ved fremstilling af disse.
FR2041760A1 (en) * 1969-05-27 1971-02-05 Owens Corning Fiberglass Corp Controlling an apparatus forming filaments - etc from a heat-softened mineral
RU2469962C1 (ru) * 2011-07-06 2012-12-20 Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" Способ определения производительности плавильного агрегата

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2305516A (en) * 1940-05-29 1942-12-15 Johns Manville Method of manufacturing mineral wool product
US2450914A (en) * 1943-09-16 1948-10-12 Johns Manville Apparatus and process for the manufacture of mineral wool
US2561843A (en) * 1948-07-06 1951-07-24 Johns Manville Apparatus for fiber collection

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2305516A (en) * 1940-05-29 1942-12-15 Johns Manville Method of manufacturing mineral wool product
US2450914A (en) * 1943-09-16 1948-10-12 Johns Manville Apparatus and process for the manufacture of mineral wool
US2561843A (en) * 1948-07-06 1951-07-24 Johns Manville Apparatus for fiber collection

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250602A (en) * 1961-12-08 1966-05-10 Owens Corning Fiberglass Corp Method for continuously wrapping formed filaments of a rotor about an internal core
US3539316A (en) * 1967-07-25 1970-11-10 Owens Corning Fiberglass Corp Method and apparatus for manufacturing fibrous structures
EP0005416A1 (fr) * 1978-04-28 1979-11-14 Rockwool Aktiebolaget Procédé pour l'amélioration du maintien constant du poids par unité de surface d'un matelas de laine minérale
US5595584A (en) * 1994-12-29 1997-01-21 Owens Corning Fiberglas Technology, Inc. Method of alternate commingling of mineral fibers and organic fibers
EP2272808A1 (fr) * 2009-06-24 2011-01-12 Paroc Oy Ab Procédé et agencement pour optimiser l'alimentation de la liaison dans un appareil de fibrage formant des fibres minérales et produit logiciel

Also Published As

Publication number Publication date
CH351892A (de) 1961-01-31
GB822528A (en) 1959-10-28
FR1175668A (fr) 1959-03-31
DE1087508B (de) 1960-08-18

Similar Documents

Publication Publication Date Title
US2822024A (en) Apparatus for manufacturing wood particle boards
US2888060A (en) Arrangement and method for the production of mats or similar flat formations of mineral wool
CN100592972C (zh) 开炼机自动炼胶工艺
DE3513295A1 (de) Verfahren und vorrichtng zum abtragen von faserballen
CN101445321B (zh) 玻璃纤维毛纱的制造方法及所用的设备
US2684206A (en) Brush roll apparatus for opening and tufting fibrous materials and mixing the fiberswith binders
GB706043A (en) Improvements relating to the blending of textile fibrous materials
GB1471732A (en) Method and apparatus for control of conditions in a process
US2301136A (en) Flow control apparatus
US2057641A (en) Single process picker system
NO124506B (fr)
US5324338A (en) Method for regulating a weight related parameter of a mineral fibre felt
US4218414A (en) Method for shredding and dry-defibrating compressed cellulose pulp and forming a batt of the resulting cellulosic fibrous material
US2653355A (en) Method for processing mineral fibers
US2964802A (en) Continuous production of slivers from textile fibres
US3467739A (en) Method and apparatus for forming products and control therefor
US4167378A (en) Apparatus for shredding and dry-defibrating compressed cellulose pulp and forming a batt of the resulting cellulosic fibrous material
US3156582A (en) Apparatus and method for treating filamentary material
US2711626A (en) Method and apparatus for collecting fibrous material and forming it into a strand
CN205889613U (zh) 再生胶精炼工程胶粉自动加料机
US3516809A (en) Apparatus for forming fibers and control therefor
CN204847455U (zh) 一种布料器
CN1011763B (zh) 球磨机自动供球装置
US3308089A (en) Method for the continuous manufacture of light building panels
CN105734791B (zh) 一种送纱装置的定量送纱方法