Acoustic web
An acoustic and airflow technology, applied in the field of sound-absorbing products and their preparation, can solve problems such as limiting the amount of noise reduction
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Embodiment 1 and comparative example C1
[0077] ULTRAMID used was extruded through a 165.1 cm wide meltblown die TM Meltblown webs were prepared from BS400N Nylon 6 polyamide resin (commercially available from BASF Corp.) and the die had a row of 381 micron pointed holes spaced 1016 microns apart. The air knife gap was set at 762 microns, and the stamper tip was recessed 762 microns from the stamper air knife. The collector was 9.53 cm from the meltblown die. The temperature of the resin in the extruder was 363°C, and the temperature of the molding gas used for spinning was 360°C at the manifold. The compression molding gas manifold pressure is 0.052 MPa. The polymer production was held constant at about 477 g / cm / hr and the collector moved at a rate to form a web having a basis weight of about 45 g / m2. The resulting meltblown web had a melting point of about 220°C and a thickness of about 0.18 mm as measured with a micrometer. The airflow resistance measured according to ASTM C522 is 721mks Rayleigh. Normalizin...
Embodiment 2 and comparative example C2 and C3
[0085]The meltblown web of Example 1 was plasma fluorinated using perfluoropropane at 2000 watts and 300 mTorr pressure. Continue for a certain time so that the mesh has 3 oil mandatory grades according to AATCC 118-1997 or ISO 14419, and a fluorine content of 0.16%. To measure percent fluorine, a 0.07 to 0.09 gram sample of fluorinated mesh is placed in a gel capsule, which is placed in a cylinder formed by a platinum wire electrode. Fill a dry 1000 mL polycarbonate flask with 15 mL of deionized water. The flask was purged with oxygen for 30 seconds and immediately the platinum electrode was placed in the flask and clamped to seal. Invert the flask and place it on a slightly angled ring stand to keep the sample dry. Connect the platinum wire to a variable power source. Turn on the power supply and increase the voltage until the sample ignites. After the combustion is complete, turn off the power and shake the flask vigorously for 1 to 2 minutes to rinse the platinum cylin...
Embodiment 3 and comparative example C4
[0093] Meltblown webs were prepared using Polybutylene Terephthalate (PBT) resin, Type 305, having an intrinsic viscosity of 0.78 (commercially available from Intercontinental Polymers Inc.). The resin was extruded through a 165.1 cm wide meltblown die having an array of 305 micron die tip holes spaced 498 microns on center. The air knife distance is 406 microns, and the die tip protrudes 635 microns from the air knife. The collector was 10.16 cm from the meltblown die. The temperature of the resin in the final extrusion zone was 321°C. The resin temperature in the meltblown die was set at an average zone temperature of 312°C, and the die gas temperature for spinning was 320°C at the manifold. The manifold pressure of the molding gas is about 0.05 MPa. The polymer was treated at a constant rate of around 357 g / cm / hr and the collector moved at a rate to produce a web with a basis weight of about 60 g / m2. At 141°C, PE120-30 thermoplastic adhesive network (purchased from Bost...
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