How to identify the good and bad kraft paper boxes

Look at the high-quality kraft paper box presents a matte surface, the texture is like a thick kraft paper bag, look closely, the surface does not have any reflective spots, the entire surface is uniform and consistent. The appearance of poor quality kraft paper boxes is glossy white, this glossy surface is often due to the poor quality of paper, adding too much whitening agent and other chemicals. Even worse, grey and black impurities similar to those found in newspapers can be seen on it.

Folding, kraft paper box folding line straight as drawn with a ruler, when the hands are released to let the carton rebound, almost invisible fold marks, indicating that the paper's flexibility and recovery is good, able to withstand multiple folding without leaving traces. Inferior quality kraft paper box folding line crooked, this is due to improper commissioning of creasing equipment in the production process or unskilled operators caused by the technology. And after folding, the paper will wrinkle quickly.

If you think the above method is still a bit troublesome, directly to a simple and brutal method, in the kraft box filled with 5 bottles of mineral water (about 2.5kg), and leave it for 24 hours. After 24 hours of load-bearing test, the bottom remains flat, without any depression, which indicates that the carton material strength, structural design is reasonable, able to withstand greater weight, in practical use can be assured that the loading of heavier items. After only 24 hours of placement, the bottom has been deformed down, and may even appear the risk of rupture, which indicates that the material of the carton is fragile, can not withstand the normal weight, and in the use of the items will easily fall and other problems, that is a bad kraft paper box.

As a kraft paper manufacturer, we are committed to providing good kraft paper boxes, if you want to buy, you can take a look at our kraft food packaging, kraft paper dispenser box and so on.