Quick answer: Set up a crate line around the crate, not the machine: one single-cavity mold, a 650–850 t fast-speed machine for 600×400 mm boxes, 20–35 s cycles, and a 650 t line budget of roughly USD 210,000–360,000. Confirm the one-cavity crate production line layout with the mold maker before the machine order is signed.
1. Define the crate before the machine
A 600×400 mm Euro box, a 400×300 mm beverage crate, a 50×30×25 cm turnover box and a foldable crate need different tools, tonnage and cycles. Fix footprint, height, load rating (20–35 kg loaded is typical), nesting ratio, stacking height, handles and drainage first. Projected area and wall section then flow from the part, not from a catalogue.
2. Size the machine from projected area
DKM’s clamp-force rule is projected area × cavity pressure (250–300 bar for crates) × 1.15. A 600×400 mm crate gives 690–830 tf, so 650 t is the floor and 850 t is the comfortable choice. Check the mold base against the tie bars: the 650 Victor’s 900×900 mm clearance takes single-cavity tools up to about 800×800 mm. Pallet boxes move to 2,000–3,000 t two-platen machines.
3. Choose one cavity or two
A second cavity doubles projected area, so a two-cavity 600×400 tool needs 1,300–1,450 t and a mold base near 1,600×1,000 mm — roughly 90% more capital for about 75% more output. One cavity is the default for mixed SKUs; two cavities only pay above about 1.2–1.5 million crates a year on a single product.
4. Fix cycle time and OEE in the contract
A 20-second cycle yields 180 crates an hour gross and about 153 at 85% OEE; a 600×400 mm crate typically runs 25–35 s. Cooling takes 60% or more of the cycle, so specify the cycle time, the OEE basis and the scrap allowance — not just machine tonnage. DKM’s 2017 field data for a 600×400×350 mm crate shows 35–40 s on a 650 t machine and about 2,100 crates a day.
5. Match the mold to the cycle
Crate tools use 718H or 738H pre-hardened steel, a valve-gated hot runner with 4–6 drops on large single cavities, directed core cooling and ejector blocks. SinoMould quotes 800,000–1,000,000 cycles of life and about 60 working days of lead time. A cheap tool that runs 10 s slower usually costs more than it saves. See the crate mold specifications before comparing quotes.
6. Automate take-out and plan the periphery
The take-out robot must remove the crate inside the mold-closed time, or the 20-second cycle disappears. Plan the cooling conveyor, granulator, check scale and packing with the machine layout, and budget about three operators per shift for one line. Buyers who order the machine first and the periphery last lose 5–15% of promised output in commissioning.
7. Build compliance into the specification
The EU PPWR (EU) 2025/40 applies from 12 August 2026: from 1 January 2030, 40% of listed transport packaging — plastic crates included — must be reusable, and 100% on own-site and same-Member-State routes. Food-contact crates also need an EU 10/2011 declaration of compliance, and recycled-content targets start at 10% (food-contact) or 35% (other plastic packaging). A turnkey supplier should hand over the documentation with the line, as part of turnkey production solutions.
About DKM (Sino Group)
DKM Machinery, part of Sino Group, builds fast-speed injection molding machines and turnkey crate lines in Taizhou, Zhejiang, China: 24+ years in crate production, 1,500+ crate molds and machines, SinoMould tooling and UL 508A-certified machines. Start with the one-cavity crate production line and the DKM-650 Victor machine.
DKM Machinery
