Test method for unevenness of Fiberglass Cloth
1 applicable scope This standard is suitable for inspecting the surface roughness of Fiberglass Cloth (fiberglass cloth).
2 definition of 2.1 surface irregularities due to partial warp or weft tightness caused by the appearance of a defect.
2.2 Glass cloth roughness glass cloth on canvas exceeds the specified minimum sag distance (i.e., the length of the cloth is uneven) and the ratio of the length of the whole cloth, expressed in percentage.
3 principle inspection of the appearance of quality, Fiberglass Cloth the operation of the glass cloth to exert a certain tension, within the specified distance, the measurement and accumulation of glass cloth over the minimum length of the specified droop distance and the length of the whole cloth, calculate the degree of inequality.
4 Test Equipment 4.1 cloth inspection machine (or similar uniform line speed coiling device).
4.2 Glass cloth flatness inspection device:
4.2.1 torque motor to drive large roller, reverse transfer control, adjust tension effect, so that the tension fluctuation is not ±15%.
4.2.2 Photoelectric relay monitoring required minimum SAG distance, accurate to ±1 mm.
4.2.3 Digital Electronic timing devices should be able to record the length of the cloth and the entire glass cloth inspection time, reading accurate to 1 seconds.
5 of the products inspected the entire glass cloth at the ends of 5 to 10 meters.
6 Test Step 6.1 Check the photoelectric relay (located in the middle of the 2 meter distance), and when the minimum SAG distance is specified, the indicator light should produce a signal display.
6.2 The glass cloth is introduced into the cloth-inspection machine According to the schematic diagram. The glass cloth must be wound straight, the weft and the winding paper tube parallel, cannot skew.
6.3 The torque motor reverse braking operation. Apply tension to the cloth. Open digital electronic timing device, and adjust 0, driving test cloth, accumulated uneven time and the entire fabric inspection time.
6.4 When the appearance of defects need to be repaired, stop, Fiberglass Cloth so that the glass cloth stop running, timing device suspended record. After the defect is repaired, drive, the glass cloth continues to run, the timer device continues to accumulate time.
6.5 After the end of the glass cloth, the record should be stopped immediately, keep its record value, and make the torque motor stop operation.
6.6. After the end of the stop, write down the fabric irregularities and the inspection time of the whole cloth.
7 results indicate that 7.1 surface roughness ε,% according to the following formula: t1ε=────x100 T2 type, T1 one by one on the surface of the uneven time, Fiberglass Cloth seconds; t2-a whole piece of cloth inspection time, seconds.
7.2 Surface roughness ε calculated to 1%.
7.3 Cloth roughness ε does not exceed the specified value for qualified goods;
8 The test report should include the following:
A. Product code and width of glass cloth;
B. Minimum droop distance provided;
C. On-canvas tension or input torque motor voltage;
D. Uneven time on canvas;
E. Inspection time of the whole glass cloth;
F. Surface roughness;
G. Marking of qualified or unqualified products;
H. Fiberglass Cloth Any circumstances in this standard that may have an impact on the test results.