Quick answer: Run 5 checks first: 8 cycles a year, items over 40 kg, batches over 30 units, spares for 5 years, tag control. Break 2 and the dedicated case stops paying; each alternative below gets its price band and its exit condition.
Table of contents
- Five Checks Before You Commit
- Steel Welded Cases Only Pay Above 60 kg
- Where a One-Way Plywood Crate Wins
- Five Boundaries Between General and Dedicated
- FAQ
1. Five Checks Before You Commit
Prices separate fast. A dedicated case sits at 1,480 CNY, a general rotomolded box at 620 CNY and a plywood export crate at 180 CNY, a factor of 8. What that gap buys is re-use cycles and traceability, not wall thickness, so count cycles first.
The 5 checks are: 8 or more cycles a year, items over 40 kg, batches over 30 units, spares for 5 years, and tag control. Break 2 of them and the cost structure stops working.
| Check that fails | What you see on site | Switch to |
|---|---|---|
| Under 8 cycles a year | Amortised cost above 185 CNY a trip | Plywood crate or general box |
| Items under 40 kg | Excess shell stiffness | General box with foam |
| Batches under 30 units | Tooling never absorbed | General or aluminium case |
| No spares past 5 years | No hinge available in year 3 | Steel case, welded on site |
| No tag control | No record of opening | One-way packaging |
Batch size is the check people misread. Under 30 units the 26,000 CNY tooling cannot be spread, and a run of 20 carries 1,300 CNY each.
2. Steel Welded Cases Only Pay Above 60 kg
Steel runs 85 kg empty with a 3 mm wall at 3,400 CNY, 2.3 times the dedicated case. What it offers is repairability: change a hinge pin, weld a patch, and 50 cycles is where the premium flattens out.
Aluminium removes 39% of that weight at 52 kg, but needs a 4 mm wall to hold stiffness, costs 2,900 CNY and distorts once repaired. By air at 22 CNY per kg, 33 kg less is 726 CNY a trip.
The line sits at 60 kg. Above it, with fewer than 8 cycles a year and a welder on site, steel wins. Between 30 and 60 kg for air freight, aluminium wins. Under 30 kg, neither: go back to a moulded case.
3. Where a One-Way Plywood Crate Wins
An 18 mm plywood crate with 2 steel bands costs 180 CNY, ships in 7 days and needs no fumigation. It wins in exactly 2 cases: batches of 10 or fewer, or a single one-way shipment.
Storage is the weak point. At 60% humidity, plywood climbs from 8% to 14% moisture in 24 months and starts to delaminate at the corners. Getting to 3 years takes a 0.1 mm foil bag and 25 g of desiccant, another 40 CNY.
Stacking stops at 2 tiers. A third tier sags the bottom lid 4 mm in 90 days and the bands go slack.
4. Five Boundaries Between General and Dedicated
A general box gives 800 × 600 × 400 mm of cavity, a 4 mm wall, 12 kg and 620 CNY. The dedicated type is built to the item: 6 mm wall, 31 kg, 1,480 CNY. The extra 860 CNY buys 4 things — support points, sealing, status reading and stack stiffness.
| Item | General box | Dedicated type |
|---|---|---|
| Cavity | 800 × 600 × 400 mm | Built to the item |
| Wall | 4 mm | 6 mm |
| Support shift | 5 mm | 1.5 mm |
| Seal | Single | Double |
| Unit price | 620 CNY | 1,480 CNY |
| Batch fit | 1 to 8 units | Over 30 units |
Displacement settles it. Foam allows 5 mm after clamping and 6 mm after one drop; a cradle seated on the flange stops at 1.5 mm.
Under 3 cycles a year, below 25 kg, with 5 mm of movement accepted, a general box with cut foam is enough. Break any 1 of those 3 and the dedicated type starts to pay.
Conclusion
Choosing is arithmetic on cycles, not a contest of wall thickness. 8 cycles, 40 kg and 30 units fence the dedicated type into a narrow band; outside it, a Missile Warhead Container is simply the expensive answer.
This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.
Related Reading
- How the shell is built and moulded
- Deriving cavity, wall and load rating
- Steel, aluminium or engineering plastic
- Body cases on the final assembly line
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