3-layer carton sheet: Including 2 normal flat layers outside and 1 waving layer in the middle.
Used for goods with a relatively small volume and weight: compact boxes, paper towels, pesticides...
B-wave 3-layer sheet:
+ Number of waves on every 30 cm: 47 +/-3
+ Height of paper wave: 2.5 mm (3/32”)
7-layer Carton sheet