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1. What Are B-Flute Corrugated Carton Boxes?

B-flute corrugated carton boxes are manufactured from three layers of corrugated paperboard, in which the middle layer is B-flute corrugated medium. B-flute carton boxes are commonly used for product packaging. The distinguishing characteristic of B-flute corrugated board is a flute height of approximately 2.5 mm, with relatively thin paper structure. The flute density of B-flute corrugated board is 47 flutes per 30 cm of paper, with a tolerance of ±3 flutes. B-flute paperboard provides the carton with enhanced resistance to puncture and external mechanical impact.
2. Structure of B-Flute Corrugated Carton Boxes
✿ Outer linerboard: The outer liner of B-flute corrugated cartons is typically Kraft linerboard, also referred to as packaging paper.

✿ B-flute corrugated medium: The B-flute layer features a flute height of approximately 2.5 mm and is considered a relatively thin corrugation. However, this flute height delivers distinctive performance characteristics. The flute density is 47 flutes per 30 cm, with an allowable deviation of approximately 3 flutes. The B-flute structure enhances the carton’s resistance to puncture and external forces acting directly on the packaging.

✿ Inner linerboard: The inner liner of B-flute corrugated cartons is the liner or XEO paper layer, made from Kraft material with a basis weight ranging from approximately 125–185 LBS, ensuring optimal paper quality as required.

3. Advantages of B-Flute Corrugated Carton Boxes
B-flute corrugation forms B-flute carton boxes that offer outstanding advantages for packaging solutions:
B-flute is thin yet highly resistant to puncture, effectively protecting products from external mechanical impact.
B-flute corrugated sheets are not overly thick, enabling the production of small-size boxes to meet packaging needs for compact items such as watches, necklaces, and similar products.
B-flute can be easily combined with other flute types to create stronger and thicker five-ply corrugated cartons.
Low investment cost: The investment cost for corrugated packaging in general, and B-flute cartons in particular, is relatively low due to the affordability of corrugated paperboard. With minimal cost, users can obtain packaging that offers multiple protective functions.
Lightweight: Corrugated paperboard generally has a basis weight of approximately 150–300 g/m². Consequently, B-flute cartons are lightweight, making them convenient for handling, transportation, warehousing, and usage.
Easy reuse and recycling: B-flute cartons, as well as corrugated cartons in general, can be reused multiple times for packaging, cushioning, and void filling, partially or entirely replacing protective padding materials. Once worn out, they can be sent to recycling facilities.
Flexible application: B-flute cartons are manufactured with multiple folds and edges, forming box structures that are easy to assemble and open, allowing efficient flat storage in large quantities.
Corrugated products comply with ASTM standards for packaging and sealing.
They create a positive impression on customers, especially environmentally conscious consumers who increasingly prioritize sustainable packaging and actively reduce the use of plastic bags.

4. Applications of B-Flute Corrugated Carton Boxes
With effective resistance to puncture and external impact during transportation and storage, B-flute corrugated cartons are widely used to manufacture packaging boxes that ensure safer and more convenient handling of goods.
B-flute corrugated cartons are considered a versatile material commonly used for COD shipping boxes for small, lightweight items such as cosmetic boxes, pharmaceutical packaging, and apparel packaging, especially on e-commerce platforms.
B-flute corrugated cartons are also widely applied in packaging beer, soft drinks, electronic components, accessories, and similar products.

If you are planning to order carton boxes but are unsure which design best suits your needs, please contact us for immediate consultation and professional support.
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