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What are the materials of cartons?

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three layers are AA
AB grade and two types of
corrugated are C-shaped
with great hardness, elasticity and high pressure bearing property
k = a, which means double pit (double corrugated) five layer carton, the outer layer is k paper and the inner layer is a paper
A = a, which means double pit carton, and the outer /inner layer is a paper

1. Base paper: K, a, B, C, 3, w
2. K: About 250g cow card or imitation cow card, which is the thickest and best kraft paper
3. A: About 170g cow card or imitation cow card is kraft paper only for this k times
4. B: About 125g cow card or imitation cow card, which is only the first time on paper a
5. C: about 126G, crisp, yellow or red, easy to break
6, 3: About 110g, gray color, generally used as corrugated paper, core paper, and also used as base paper
7. W: white book paper of about 170g
1. Pit type
1. Single pit: three layers, consisting of one layer of face paper, one layer of corrugated and one layer of bottom paper. The thickness is 2mm, indicating e-pit (e.g. B33, B3c, a3b, A3A, K3b, etc.)
2. Double pit: five layers, consisting of one layer of face paper, two layers of corrugated, one layer of core paper and one layer of bottom paper, with a thickness of 6mm. (example: B = B, B = C, a = B, etc.)
3. Three pits: seven layers, consisting of one layer of face paper, three layers of corrugated, two layers of core paper and one layer of bottom paper, with a thickness of 9mm. (for example, B3b can also be written as b#b, a3b, a#b, etc.
4. See pit: there are single see pit and double see pit. The single see pit is represented by B3, C3,…; the double see pit represents b333 or B = see pit. All the single see pits are composed of bottom paper + corrugated, and the double see pit is bottom paper + corrugated + core paper corrugated.

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