Smell the smell

If the taste is very strong, there is a sour smell, the retention of the tape is very poor, especially in low temperature environment, the basic sticking on the carton will crack, the thicker the taste, the initial sticky force is still very sticky, but The glue surface will soon dry up and lose its colloidality. At that time, there will be cracks on the surface of the tape. Because of the uneven relationship between the glue.

Look at the brightness of the film

Generally, inferior tapes are dark in color, and the probability of such tape breaking is very high and the strength is poor.

Feel film thickness

Tapes that feel hard on the film are generally inferior, and the actual number of meters is reduced due to the film thickness. The film selected for good tape is relatively soft and stretchable with hand.

Look at the color

Generally, the whiter the appearance of the transparent tape, the less the tape impurities, the better the adhesiveness is guaranteed. The tape below 100 meters has a certain transparency to see the paper tube. The yellow tape looks at the surface of the tape with irregular white spots, and the ink that is not pressed by hand is an impurity or a dry blot. This product generally has an odor.

Look at the paper tube

Tapes that use thick paper tubes are generally designed to mislead consumption. The production of tape began from abroad, so the inner diameter of the paper tube of the tape is uniform 7.6 cm, but the inferior tape is enough for the thickness of the paper tube, and this situation is still related to many consumers. Many people think that the thicker the paper tube is, the bigger the outer ring is, the more the tape is rolled up. The fierce one seems to be correct. Can you calculate it carefully? Let's say that with a 3 mm paper tube and a 7 mm paper tube ratio, if the thickness of the two rolls of tape from the outer diameter of the paper tube to the edge of the tape is 1 cm, we can use a mathematical formula to calculate the 7 mm paper tube comparison. Can a 3 mm paper tube have a few meters of tape per 1 cm of glue?