Buyers compare unit prices but rarely compare capacity, then discover in October that the factory who quoted 15 days is now quoting 28. Capacity is not a number on a wall; it is arithmetic between machine counts, shift patterns and the queue already in front of your order. Here is how a mid-size paper packaging factory - roughly 60-120 workers - actually converts equipment into daily output, and where the honest boundaries sit.
The Chain, and Where It Bottlenecks
Printed packaging moves through four stages: printing, die-cutting, finishing, then gluing or assembly. Each machine type has a characteristic speed, and the slowest stage - not the fastest - sets your delivery date.
| Machine | Typical output | Role | Bottleneck risk |
|---|---|---|---|
| Sheet-fed offset press (4-5 colour, 750x1050 mm) | 12,000-15,000 sheets/hr | Printed board | Low - usually has slack |
| Flatbed die-cutter | 4,000-7,000 sheets/hr | Cut and crease | Medium |
| Hot-foil / embossing | 2,500-4,000 impressions/hr | Finishing | High in peak |
| Folder-gluer | 8,000-40,000 cartons/hr | Folding cartons | Low |
| Crash-lock base machine | 300-500 boxes/hr | Rigid box bases | High - main constraint |
| Hand assembly line | 150-300 boxes per worker-shift | Complex rigid boxes | High - labour-bound |
Notice the pattern: printing is rarely the constraint, while rigid box base-making and hand assembly always are. This is why two factories can quote the same folding carton in 12 days but differ by two weeks on a hinged-lid gift box.
Worked Example: 10,000 Rigid Boxes in 12 Working Days
Take a magnetic-closure rigid box, 10,000 sets, custom printed. After artwork approval: material procurement 2-3 days (board and wrap paper are usually stocked in common calipers, custom colours take longer); printing half a day; die-cutting half a day to one; crash-lock base machines 2-3 days at roughly 400 boxes/hour on one line; wrapping and assembly 2-3 days with 10-15 hand workers; QC and packing one day. Realistic total: 8-12 working days, which is why 15-20 days is the honest quote - the gap is material lead time and queue position, not machine speed.
Folding Cartons Are a Different Machine Problem
A folder-gluer running 8,000-40,000 cartons per hour turns a 100,000-piece carton order into a one-day gluing job. Printing is the real constraint: at 15,000 sheets per hour with a 16-up layout, one press produces about 240,000 cartons per day of print capacity. So a mid-size factory with one press and two gluers can absorb surprisingly large carton orders quickly - folding cartons move at a pace rigid boxes never match, which is why their MOQ and lead times look so different on the same quotation.
Peak Season and Rush Insertion: The Honest Boundaries
- September-November is the Christmas build; lead times stretch from 15-20 to 25-30 days. Book 6-8 weeks ahead for anything custom-tooled.
- January-February capacity collapses for 2-4 weeks around Chinese New Year as workers travel home; material suppliers thin out even earlier.
- Insertion into a running queue is genuinely possible for small volumes on repeat tooling, because the die and print files already exist. A 3-5 day rush typically means overtime shifts plus expedited material purchase, costing 10-20% more.
- New tooling plus insertion rarely saves more than 2-3 days, because custom board and mold time run on their own schedule regardless of queue position.
If a supplier promises a 7-day turnaround on a first-order custom gift box in October, that is not capacity - that is a quote you should be suspicious of.
What to Ask Before You Commit
1. Machine list with brands and years - in-house die-cutters matter, because outsourced die-cutting adds 2-3 days each way. 2. Shifts per day - 1.5-2 shifts is standard at this scale; a factory claiming three is either very good or very new. 3. Current load - a straight answer like "about 80% booked through mid-November" is worth more than any brochure. Our rigid boxes team shares queue position at quotation, which is how factory-direct pricing should work.
FAQ
How many rigid boxes can a mid-size factory make per day?
On one or two crash-lock base machines plus hand assembly, 3,000-8,000 machine-base boxes per day; complex hand-wrapped designs drop to 1,500-3,000. Any quote implying multiples of this on short notice is borrowing time from other buyers' orders.
Why did my lead time go from 15 days to 25 in October?
Peak-season queue saturation. Printing usually retains slack, but finishing, base-making and hand assembly saturate first. The factory has not slowed down; the line in front of you got longer. Ordering before mid-August locks in the normal window.
Can a factory add my order mid-queue?
Yes for small repeat-tooling volumes - existing dies and approved artwork make insertion cheap. First-time custom orders cannot shortcut material procurement and mold-making, so insertion saves at most 2-3 days. Ask for the queue position in writing and hold the factory to it.