Zipper bag manufacturer introduces sampling method of boiled bag
① After the machine test of boiling bag is normal, the inspector shall randomly and continuously select several sample bags (the sampling quantity shall cover the length of longitudinal sealing knife) from each row of test bag, and then conduct boiling test.
② When sampling more than two bags out of one bag, mark the bag out and the left and right directions with marking pen, so as to accurately judge the position of sealing knife where the heat sealing is not firm.
③ When the technological conditions of normal production of zipper bag change obviously, such as machine speed and temperature adjustment, it is necessary to re sample for boiling test.
④ After each shift, the samples shall be re sampled for boiling performance test.
⑤ The unqualified products found in the process shall be isolated in time.
Expanding knowledge: the influence of zipper bag mixed solvent
Plastic gravure printing ink generally uses mixed solvents. The volatilization rate of mixed solvents is not only related to the boiling point of each solvent itself, but also affected by the solvent molecules. The volatilization rate is not the average value of the volatilization speed of each mixed solvent. When selecting the solvent, we must consider both the printing requirements and the residual solvent as small as possible. www.dgbpk.com/
Dongguan Beite packaging materials Co., Ltd
Dongguan special bag, plastic bag, plastic bag, plastic bag