1 Design determines the final effect of the product

For carton products, design is particularly important; otherwise, it is difficult to meet customer requirements, which may result in returns and cause significant losses to the company.

In my view, after the sales department receives an order, all customer information should be conveyed to the process design department. This includes decorative requirements for the layout, specifications and dimensions, box type structure, contents and load weight, stacking layers, and other relevant details. After design by the design department, the order is passed to the manufacturing department to complete product realization.

1) Calculate the maximum stacking load Ps that the bottom carton can withstand

Ps = (Nmax - 1) · G, where Nmax is the maximum stacking layers, and G is the weight of the contents and the carton itself.

2) Select an appropriate safety factor K

According to the requirements of SN/T0262-93 (Export Transport Packaging Corrugated Carton Inspection Regulations), when the storage period is less than 30 days, K = 1.6; when the storage period is between 30 and 100 days, K = 1.65; when the storage period exceeds 100 days, K = 2.

Of course, for safety reasons, the safety factor is usually taken as 3 or above. However, if the safety factor is too large, the various material indices need to be correspondingly higher, which will significantly increase paper costs, raising overall expenses and hindering market development. On the other hand, if the safety factor is too small, quality issues such as box collapse may occur. Therefore, the appropriate safety factor should be selected based on the customer's actual requirements.

3) Calculate the required maximum compression strength value P based on the safety factor

P = K · Ps

4) According to the Kelicutt formula, select the appropriate paper combination

Px · F = P (already calculated)

Therefore, Px = P / F, where F is a constant related to the carton perimeter length and flute type, obtained from tables. Px is the comprehensive ring crush strength value of the corrugated board, and Px = (R1 + R2 + Rm1C) / 15.2

If the ring crush index and grammage of any one or two of R1, R2, and Rm1C are known, the ring crush index and grammage of the third material can be calculated, achieving a reasonable paper combination.

2 Proper process control is the guarantee of product realization

Whether the products designed by the process technology department can be properly implemented depends critically on the strict execution of standards at each production stage. Therefore, it is essential that shift supervisors promptly monitor the quality of their respective processes to ensure the final quality of the product.

In addition, quality inspectors should conduct regular and unscheduled inspections, promptly correcting and handling any deviations from the prescribed processes, to ensure strict compliance with the process standards.

Carton Standard Sizes

Size 1 Standard 5‑layer 530*290*370mm Large‑item products

Size 2 Standard 5‑layer 530*230*290mm Luggage, cases, etc.

Size 3 Standard 3‑layer 430*210*270mm Luggage, cases, shoes, etc.

Size 4 Standard 3‑layer 350*190*230mm Shoes, etc.

Size 5 Standard 3‑layer 290*170*190mm Decorative items, etc.

Size 6 Standard 3‑layer 260*150*180mm Cosmetics, accessories, etc.

Size 7 Standard 3‑layer 230*130*160mm Cosmetics, accessories, etc.

Size 8 Standard 3‑layer 210*110*140mm Cosmetics, accessories, etc.

Size 9 Standard 3‑layer 195*105*135mm Cosmetics, accessories, etc.

Size 10 Standard 3‑layer 175*95*115mm Cosmetics, CDs, etc.

Size 11 Standard 3‑layer 145*85*105mm Cosmetics, CDs, etc.

Size 12 Standard 3‑layer 130*80*90mm Cosmetics, small accessories

Extra‑large Size Standard 5‑layer 600*500*400mm Suitable for moving houses.