What is the minimum order for custom plastic box manufacturing?

Answer: 3,000 pieces a colour. Five colours means five lots plus a 400 CNY fee each, and above 10,000 pieces the price gives up another 8 percent.

Do 16 cavities produce uneven part weights?

Answer: They can. A spread above 1.5 g points to an uneven pressure drop, so weigh three parts from every cavity and rework the runner if the spread passes 2.4 percent.

What does one colour change cost?

Answer: 35 minutes of purging and 12 kg of compound, about 550 pieces. Dark to light adds 10 minutes, light to dark saves 5, so sequence by shade.

Is 0.3 mm of print misalignment a reject?

Answer: Yes. The limit is plus or minus 0.25 mm and 0.3 mm shows on two-colour work. Single-colour print stretches to 0.35 mm; two colours stay inside 0.25.

How long from sample to mass production?

Answer: 35 days: tooling 18, trial 4, sign-off 3, production 10. Changing only the print cuts it to 20 because the mould stays untouched.

Custom Plastic Box Manufacturing: Quotes, MOQ and Lead Time

Quick answer: Small moulded boxes are priced by cavity count, part weight and secondary work, ordered by colour, and delivered on a chain that turns at sample approval. A 220×160×55 mm box of 62 g runs 16 cavities on a 280-tonne press at 26 seconds, quotes near 1.1 CNY, starts at 3,000 pieces a colour and reaches production in 35 days.

Cavity Count Drives the Price of Custom Plastic Box Manufacturing
Cavity Balance, Ejection and Runner Design
Colour Difference, Flash and Print Registration
Bag and Carton Packing With MOQ
From Sample Approval to Mass Production
FAQ

1. Cavity Count Drives the Price of Custom Plastic Box Manufacturing

In custom plastic box manufacturing the unit price is divided by cavity count. A 220×160×55 mm part with 1.8 mm walls weighs 62 g, so a 16-cavity tool shoots 992 g plus a 60 g runner on a 280-tonne press in 26 seconds.

Moulding is 145 CNY an hour times 26 seconds over 3,600, or 1.05 a shot, divided by 16 for 0.065 a piece; resin at 9,400 CNY a tonne adds 0.58. The two lines cover 55 percent of the price.

Cavities	Cycle	Pieces an hour	Moulding cost	Tooling
4	22 s	655	0.22 CNY	48,000 CNY
8	24 s	1,200	0.12 CNY	74,000 CNY
16	26 s	2,215	0.065 CNY	126,000 CNY

2. Cavity Balance, Ejection and Runner Design

In a 16-cavity tool the faults sit between cavities. The flow path from sprue to cavity must stay within 15 mm and part weight within 1.5 g, or 2.4 percent of 62 g; far cavities that short-shot mean an uneven pressure drop.

Custom plastic box manufacturing: white box body turned side-on, top handle folded up, symmetric vertical ribs, rounded lid corners, four small feet on the floor

Two 3 mm ejector pins a cavity, 32 at 2.4 tonnes, sit inside the base corners; whitening above 0.15 mm leaves the base rocking. The 60 g cold runner is 6 percent of the shot, and two regrind passes cost about 8 percent of impact strength.

3. Colour Difference, Flash and Print Registration

Colour trouble comes from colour changes. Purging takes 35 minutes and 12 kg of compound plus 8 first-off checks, about 550 pieces of output, so custom plastic box manufacturing orders are counted by colour: five colours are five set-ups.

Limits belong in writing: ΔE 1.2 within a batch and 2.0 between, on five parts under D65 light; flash under 0.10 mm with 0.02 mm vents, or the lid sits proud.

Registration holds at plus or minus 0.25 mm on a 300-mesh screen, with 0.06 CNY for a second colour and 15 minutes curing at 60 °C; curved faces go to pad printing at 0.14.

4. Bag and Carton Packing With MOQ

In custom plastic box manufacturing packing is charged per piece: inner bags of 50 at 0.05 CNY, a printed colour box at 0.35, and a 585×385×310 mm carton of 200 loose pieces at 13.8 kg gross.

Custom plastic box manufacturing: black box body at an angle, blank lid, two front latches hooked over the rim, handle folded into a recess, one-piece corner guards

The minimum is 3,000 pieces a colour; below that tooling and colour change cannot be absorbed and the price passes 1.8 CNY. Five colours carry a 400 CNY change fee each.

A pallet takes 20 cartons, four a layer over five, for 4,000 pieces at 276 kg; retail packing uses 24 colour boxes a carton.

5. From Sample Approval to Mass Production

The advantage of custom plastic box manufacturing is a short chain whose shortest link is the sample. A 3D print arrives in 48 hours for 600 CNY but only proves shape and closure; shrinkage and wall thickness need the production tool.

The trial runs 4 days with 30 parts measured, sign-off 3 days, production 10 days, and tooling 18 days from drawing release: 35 days in all, 12 on a repeat. New print means a screen in 3 days; a new cavity count means a new tool.

Stage	Days	Deliverable
First trial	4	30 parts, size report
Sign-off	3	Signed sample, screen
Production	10	3,000 pieces packed

Sign-off in 3 days means artwork must be fixed while the tool is cut; a week lost on artwork delays production.

Conclusion

Buying custom moulded boxes is less about the lowest number than whether cavity count, colour count and secondary work are calculated through. Fix 16 cavities, 62 g, 3,000 pieces a colour and 35 days, and every quotation line can be traced. That is what makes custom plastic box manufacturing negotiable.

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.