1 Scope This standard applies to the inspection of Fiberglass Cloth (referred to as fiberglass cloth) cloth roughness.
2 Definitions 2.1 An uneven appearance due to unevenness of part of the warp or weft yarn. 2.2 Glass cloth uneven glass cloth surface than the provisions of the minimum sag distance of the cloth length (ie, uneven cloth length) and the length of the whole cloth ratio, expressed as a percentage.
3 Principle When testing the appearance quality, apply a certain tension to the running glass cloth, and measure and accumulate the length of the glass cloth over the specified minimum sag distance and the length of the whole cloth, and calculate the roughness.
4 test equipment 4.1 inspection machine (or similar uniform speed winding device). 4.2 glass cloth flatness detection device: 4.2.1 torque motor drive large roller, Fiberglass Cloth reverse brake control, adjust the tension, so that the tension fluctuation is not greater than ± 15%. 4.2.2 photoelectric relay monitoring of the provisions of the minimum sag distance, accurate to ± 1 mm. 4.2.3 Digital electronic time devices should be able to record the uneven cloth time and the whole glass cloth inspection time, the reading accuracy to 1 second.
5 tested products across the glass cloth at both ends of the 5 to 10 meters.
6 Test Procedure 6.1 Check the photoelectric relay (located in the middle of the 2 m distance). When the minimum sag distance is specified, the indicator should generate a signal display. 6.2 according to the schematic diagram of the glass cloth into the inspection machine. The glass cloth must be wound straight and the weft yarns are parallel to the coiled paper tube and can not be skewed. 6.3 Make the torque motor reverse brake operation. Apply tension to the cloth. Open the digital electronic timing device, and zero, driving inspection cloth, Fiberglass Cloth the cumulative uneven cloth time and the whole cloth inspection time. 6.4 Appearance defects need to repair, stop, so that the glass cloth to stop running, the timing device to suspend the record. After the defect repair, drive, glass cloth to continue running, the time device to continue to accumulate time. 6.5 When the glass cloth is tested, it should stop recording immediately, keep its recorded value, and stop the torque motor. 6.6 After winding the end of the car, note the uneven cloth time and the whole cloth inspection time.
7 results that 7.1 cloth roughness ε,% according to the following formula: t1 ε = ─ ─ ─ 100 t2 where, t1 one cloth uneven time, seconds; t2 - a whole cloth inspection time, second. 7.2 The roughness of the cloth is calculated to be accurate to one percent. 7.3 cloth roughness ε does not exceed the specified value for the qualified products; more than the specified value for the non-conforming products.
8 Test report The test report shall include the following: a. Glass cloth product code, width; b. The minimum sag distance specified; c. Cloth tension or input torque motor voltage; d. Cloth uneven time; The whole glass cloth inspection time; f. Cloth roughness; Mark a qualified product or a defective product; h. Fiberglass Cloth Any conditions that may not be specified in this standard that may affect the test results.