Kraft paper and test paper are the two most common types of paper used in corrugated boxes.

When it comes to the inner liner, test paper is typically used, with Kraft paper being used for the outer liner of the box.

Compared to test paper, kraft paper is more expensive, but it is of higher quality.

Kraft paper is made from softwood trees such as pine, spruce, and fir, and contains 70-80% virgin chemical pulp fiber. Kraft paper is used in the production of packaging. It is available in a number of different colors and finishes, including brown, white, mottled, fully bleached, and birch faced.How to choose a perfume packaging box supplier?

Kraft paper also has a smoother finish than regular paper, which makes it easier to print on. It's also more water-resistant, which means it'll keep the contents of the bag safer for longer. Furthermore, it is more durable than test paper due to its higher tear and burst resistance levels.

Oak, Sycamore, Birch, and Chestnut are examples of hardwood trees with short fibers, and test liners are typically made from these trees or from recycled paper. However, while test paper is less expensive than kraft paper, it is less durable and more difficult to print on. As a result, test paper is frequently relegated to the inside of boxes, where it is less visible to the eye.

Learn about the different Flute Grades for your corrugated boxes by reading this article.

Corrugated boxes are distinguished from their cardboard counterparts by the flute (the wavy part sandwiched between the liner and the outer shell).

The flute size determines the thickness of the box walls, as well as the stacking strength of the box, which is determined by the flute size. Flutes are designated by a letter that corresponds to the size of the flutist. They are classified according to their thickness and the number of flutes per linear foot. The following are the most frequently encountered flute sizes:

The A-Flute (33 flutes per linear foot) is the largest flute, measuring 1/4" thick and measuring 33 flutes per linear foot. Because of its thickness, it provides a high level of protection and is an excellent choice for fragile items.How to choose a perfume packaging box supplier?

B-Flute (47 flutes per linear foot) is 1/8" thick and has 47 flutes per linear foot. This is significantly thinner than A-flutes, but it is surprisingly strong. It's frequently used for counter displays and canning products. This flute is popular for die-cut designs because of its flexibility.

Thickness of C-Flute is 3/16" (there are 39 flutes per linear foot). As the most popular shipping box option, this is the one you're most likely familiar with, which means you've probably used it before.

E-Flute (which has 90 flutes per linear foot) is only 1/16" thick, making it a relatively thin material. The smaller flute does not have as much strength as the larger flutes, but it does have some advantages over the larger flutes. When folding carton boxes, it can be used in place of paperboard in some cases. Stores well and prints well. It's a good choice for printing.

F-Flute (125 flutes per linear foot) is 1/32" thick and is one of the thinnest of the flute grades, with a flute density of 125 per linear foot. It has a very smooth surface, which ensures that printed graphics will appear crisp.