A system for spraying products onto glass fibers, designed to spray at least one sizing composition and an anti-dust agent onto the glass fibers includes two separate annular spraying elements which are successively arranged on the path of the glass fibers, the two spraying elements including a first annular element for spraying the sizing composition and a second annular element for spraying the anti-dust agent, each one embodied by at least one specific annular crown surrounding the glass fibers. The second annular element for spraying the anti-dust agent is arranged downstream of the first annular element for spraying the sizing composition in relation to the path of the glass fibers.

A method for making a thin padding from stabilized fibers, for clothing articles, quilts and sleeping bags, having the steps of: providing a synthetic fiber lap; processing the synthetic fiber lap by spreading thermoplastic resins on a surface of the synthetic fiber lap; recovering excess thermoplastic resins from the processing step where thermoplastic resins are spread, recycling the excess thermoplastic resin in another processing step where thermoplastic resins are spread; heating said thermoplastic resins and said lap synthetic fibers; and reducing a thickness of said lap and smoothing the synthetic resin lap to provide a thin padding.

A method for making a thin padding from stabilized fibers, for clothing articles, quilts and sleeping bags, having the steps of: providing a synthetic fiber lap; processing the synthetic fiber lap by spreading thermoplastic resins on a surface of the synthetic fiber lap; recovering excess thermoplastic resins from the processing step where thermoplastic resins are spread, recycling the excess thermoplastic resin in another processing step where thermoplastic resins are spread; heating said thermoplastic resins and said lap synthetic fibers; and reducing a thickness of said lap and smoothing the synthetic resin lap to provide a thin padding.

A method for producing and/or processing a nonwoven glass fabric web includes thermally drying the nonwoven glass fabric web via infrared radiation from an infrared radiation dryer. A specific power density of at least 153 kW/m.sup.2 is applied by the infrared radiation dryer to the surface of the nonwoven glass fabric web facing toward the infrared radiation dryer. After the irradiation by the infrared radiation dryer, the nonwoven glass fabric web has a temperature of at least 40 C. and at most 105 C. on its surface facing toward the infrared radiation dryer.

A method for producing and/or processing a nonwoven glass fabric web includes thermally drying the nonwoven glass fabric web via infrared radiation from an infrared radiation dryer. A specific power density of at least 153 kW/m.sup.2 is applied by the infrared radiation dryer to the surface of the nonwoven glass fabric web facing toward the infrared radiation dryer. After the irradiation by the infrared radiation dryer, the nonwoven glass fabric web has a temperature of at least 40 C. and at most 105 C. on its surface facing toward the infrared radiation dryer.

A device for controlling a system for spraying a bonding composition onto mineral fibers, includes a ring, inside which the mineral fibers pass, a spray nozzle arranged on the ring and for spraying the composition onto the fibers, a first apparatus for measuring a flow of a fluid relative to the sprayed composition and a second apparatus for measuring a pressure of a fluid relative to the sprayed composition. A module compares a pair formed by a value, measured by the first apparatus, of the fluid flow and a value, measured by the second apparatus, of the fluid pressure, with a pair formed by a first previously defined reference value of a considered fluid flow, and by a second previously defined reference value of the considered fluid pressure. A pump feeds the fluid into the device so that a value of the flow of the fluid is constant.

An annular device (20) for spraying a sizing composition onto mineral fibres (3) comprises at least one circuit (24, 26) for distributing the sizing composition and at least one spray nozzle (22) in fluid communication with the distribution circuit and arranged on the periphery of the annular spray device in order to spray the sizing composition onto the fibres that pass through the annular spray device defined by an axis of revolution (X-X). According to the invention, the sizing composition is a binder based on biosourced products, and at least one spray nozzle comprises a spray head (36) having a slot (50) through which the biosourced-product-based binder leaves the annular spray device, said slot having a rectangular cross-section such as to form a flat jet of biosourced-product-based binder.

An annular device (20) for spraying a sizing composition onto mineral fibres (3) comprises at least one circuit (24, 26) for distributing the sizing composition and at least one spray nozzle (22) in fluid communication with the distribution circuit and arranged on the periphery of the annular spray device in order to spray the sizing composition onto the fibres that pass through the annular spray device defined by an axis of revolution (X-X). According to the invention, the sizing composition is a binder based on biosourced products, and at least one spray nozzle comprises a spray head (36) having a slot (50) through which the biosourced-product-based binder leaves the annular spray device, said slot having a rectangular cross-section such as to form a flat jet of biosourced-product-based binder.

A molding process includes the operation of placing insulation material comprising fibers and binder on the fibers in a mold cavity. The molding process further includes the operation of transferring heat to the insulation material to cause the binder to cure.

An annular discharge device for discharging a gluing composition onto glass fibres includes at least one distribution circuit for the gluing composition and a plurality of spray nozzles fluidically connected with the distribution circuit and distributed over the perimeter of the annular discharge device for discharging the gluing composition onto the glass fibres intended to pass into the annular discharge device defined by an axis of revolution, each spray nozzle being oriented towards the interior of the annular discharge device with an angle of inclination determined in relation to the plane of revolution of the annular discharge device. At least two spray nozzles arranged consecutively on the perimeter of the annular discharge device are disposed so as to have an orientation with respect to the plane of revolution of the annular discharge device each with a different angle of inclination with respect to one another.