What Over-Packaging Rules Mean for Corrugated Printing: Short Runs and More Box Sizes

1. What the regulation actually caps

On 10 August 2021 the State Administration for Market Regulation and the Standardization Administration of China issued GB 23350-2021, "Restrictions on excessive packaging - Food and cosmetics", a mandatory standard that took effect on 1 September 2023 after a two-year transition. It applies to the sales packaging of food and cosmetics. The three limits below are taken from the standard itself and from the public implementation guides published by market-regulation authorities:

• Packaging layers: no more than three layers for grain and grain products, mooncakes and rice dumplings; no more than four layers for all other products.
• Void space: a banded limit by net content per unit, ranging from 30% to 85% - the smaller the net content, the higher the void ratio allowed. Exact figures are calculated with the necessary-space coefficient given in the standard.
• Packaging cost: all packaging other than the layer in direct contact with the contents must stay within 20% of the product's selling price; for mooncakes and rice dumplings priced above CNY 100, the limit is 15%, and precious metals and rosewood are not permitted.

Under China's Standardization Law, products that do not meet a mandatory standard may not be produced, sold or imported. For a corrugated converter, the practical consequence is that brand owners re-work box dimensions, inserts and layer counts.

2. What changes in the order book

Capping layers and void space changes the box itself: the same contents now need a closer-fitting carton, and the space once given to inserts and accessories has to be surrendered. One box size covering several SKUs no longer works, and sizes have to be re-banded by net content. Three consequences follow on the production side:

• More box sizes per brand, and smaller quantities per order.
• Artwork changes with the box: dimensions, barcodes, category text and copy all have to move in step.
• More plate and washup cycles, so fixed setup work takes a larger share of total cost.

To be clear, this is a process-level deduction from the layer and void-space limits, not a market statistic from any agency. Your real order pattern depends on your own customers.

3. Why plate-free printing fits this profile

With short runs and many sizes, the bottleneck is not the printing itself but the setup before each job change. Digital printing compresses that setup into minutes:

• Print from a single sheet, no plates: the RS1800-HPA3 needs no platemaking and no washup. Heads install in one step, cleaning is fully automatic, and it runs at 10-30 m/min (33-98 ft/min) - sized for a few thousand to tens of thousands of boxes a day with shifting specs.
• A job change is a file change: the RS2500-E16SM FAQ describes switching orders with a few clicks - no plate washup, no ink swap, no re-adjustment of the press.
• Variable data: the RS2500-E36S supports proof-on-demand, instant correction and variable data, so artwork can change within a single batch, which suits multi-SKU production.

4. Match the press to your dominant box width

Banding your box sizes by flat width and matching them to a format is more useful than starting with speed:

• 900 mm (35.4 in): the RS1800-HPA3 prints 900 mm wide with unlimited length in the feed direction, using three high-precision thermal inkjet heads at ≥1,200 x 300 dpi. Fine text and 1D/2D barcodes print cleanly and scan reliably.
• 1,200 mm (47.2 in): the RS2500-E36S runs 1,200 mm in high-speed mode, reaching up to 106 m/min (348 ft/min), with 36 high-precision piezo heads at >600 x 300 dpi. An inline drying and varnish system is available when water resistance matters.
• 2,500 mm (98.4 in): the RS2500-E16SM covers both scanning and single-pass modes - 600-1,200 m²/h scanning and 30-60 m/min single-pass - with sixteen Epson i3200-A1 micro-piezo heads at a rated ≥360 x 600 dpi. Auto feed handles up to 2,500 x 1,350 mm (98.4 x 53.1 in); manual feed takes 2,500 mm width with unlimited length.
• The RS2500-E8 and RS2500-E16 are wide-format scanning presses rated at up to 600 m²/h (6,458 sq ft/h). The E8 uses 8 heads at >360 x 600 dpi; the E16 uses 16 heads at >360 x 1,200 dpi. The difference is mainly resolution and throughput.

All of these corrugated models accept board from 3 to 40 mm (0.12-1.57 in), covering common single-wall through double-wall grades. Unusual or very thick boards should be tested with a sample run.

5. Brand colour and water resistance: where jobs usually fail

• Brand colour: the RS2500-R16UV is built for spot-colour work - ink is pre-mixed to a brand swatch rather than simulated by CMYK overprinting - so brand colour stays consistent between runs. It is the choice when strict VI compliance matters.
• Water resistance: the RS2500-E36S can run water-based pigment ink, which holds up better against moisture than dye ink on corrugated board - a fit for cold chain, fresh produce and long-haul shipping. Test your own board to confirm the rating you need.
• Odour-sensitive work: the RS1800-HPA3 uses a dedicated water-based ink set containing no VOC solvents, so there is no harsh odour on the shop floor - suitable for food, personal-care and baby-product packaging.

6. A practical checklist

• Band your box sizes by flat width and confirm whether the need is 900 mm, 1,200 mm or 2,500 mm.
• Count units per batch and changeovers per day to decide whether speed (m/min) or format and resolution (dpi) should come first.
• Send samples for a test run and measure water resistance, rub resistance and barcode scan rates before deciding on a UV model or a lamination step.
• Check site requirements: a level load-bearing floor, three-phase power and a stable air supply; UV presses also need provision for cure extraction.
• Contact a consultant for configuration and pricing - the right setup follows your box mix and order structure.

Reducing packaging drives box-size proliferation, and box-size proliferation leads straight to short runs and many variants. Settle format, changeover cost and ink system first, and the equipment decision gets a lot easier.