Corrugated Box Pricing Formula
Box price (RMB) = Corrugated board price per m² (RMB/m²) × Box expanded area (m²).
Calculating Corrugated Board Price per m²
1.1 Standardize Measurement Units
– Raw material pricing: Purchased facing paper, liner paper, core paper, and corrugated medium are priced per ton (RMB/ton). Convert to RMB/kg (e.g., 5000 RMB/ton = 5 RMB/kg).
– Grammage: Convert paper weight from g/m² to kg/m² (e.g., 500 g/m² = 0.5 kg/m²).
– Corrugation compression ratios:
– A-flute: 1.59 (1.59m of medium → 1m after corrugation)
– B-flute: 1.36
– C-flute: 1.50
– E-flute: 1.27
1.2 Cost per m² for Each Layer
– Facing/liner/core paper:
Example: 350 g/m² facing paper at 5000 RMB/ton:
`(5000/1000) × (350/1000) = 1.75 RMB/m²`
– Corrugated medium:
Example: 180 g/m² medium at 2000 RMB/ton (A-flute):
`(2000/1000) × (180/1000) × 1.59 = 0.57 RMB/m²`
1.3 Total Raw Material Cost per m²
Example: 5-layer board (300 g/m² kraft facing, A/B-flute 180 g/m² medium, 180 g/m² core, 280 g/m² liner):
| Layer | Grammage | Price (RMB/ton) | Calculation | Cost (RMB/m²) |
| Facing (kraft) | 300 | 5200 | (300/1000)×(5200/1000) | 1.56 |
| Medium (A/B) | 180 | 2250 | (180/1000)×(2250/1000)×2.95 | 2.39 |
| Core | 180 | 1700 | (180/1000)×(1700/1000) | 0.31 |
| Liner | 280 | 2500 | (280/1000)×(2500/1000) | 0.7 |
| Total | 4.96 |
1.4 Factory Price of Corrugated Board
– Factory price = Raw material cost / 0.65 (assuming 65% material cost share).
Example: `4.96 / 0.65 = 7.63 RMB/m²`.
Box Expanded Area Calculation
2.1 Key Parameters
– Machine width: Typically 1.6m (max 2.2m).
– Box dimensions: Width (W), Height (H), Length (L) in meters.
2.2 Formula
Number of boxes per machine width (Y):
`Y = Machine width (X) / (W + H + 0.06)` (rounded down).
- Pricing width (B): `B = X / Y`.
- Pricing length (A): `A = (L + W + 0.06) × 2 + 0.04`.
- Box area (S): `S = B × A`.
Notes:
– `0.06m`: Edge trimming allowance.
– `0.04m`: Tongue allowance (non-reducible).
