Introduction: Confused by technical specs? You’re not alone.
When purchasing a flexo printing press, many printers face a long list of technical parameters – width, number of color stations, sleeve vs. conventional plate cylinder, drying system, drive type, and more.
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Should you choose 800mm or 1200mm width?
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Is 4 colors enough, or do you need 6?
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Conventional plate cylinder or sleeve system?
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Electric heating or hot air drying?
Choose wrong, and you either pay for features you’ll never use, or find yourself capacity‑constrained a year later.
This article will help you navigate the selection process from three practical angles: your product types, order structure, and budget.
1. How to choose the right printing width: bigger is not always better
Printing width is one of the most basic parameters, typically ranging from 600mm to 1600mm.
Selection principle
Press width = maximum product width + margin for operation
A good rule of thumb: the machine’s maximum printing width should be 100–200mm wider than your widest product. This gives you enough room for setup and adjustments.
Width recommendations by product
| Main product type | Recommended width | Why |
|---|---|---|
| T‑shirt bags, small pouches | 600–800mm | Sufficient, lower energy consumption, smaller footprint |
| Food packaging, daily chemical bags | 800–1000mm | Mainstream size – balances efficiency and cost |
| Woven bags, rice bags | 1000–1200mm | Needed for wider formats |
| Industrial films, large packaging | 1200–1600mm | Professional wide‑width machine |
Common mistake: Assuming wider is always better. Actually, wider machines cost more, consume more energy, and take up more floor space. If your widest product is 600mm, buying a 1200mm press is wasteful.
Lisheng’s advice: Add 15–20% to your current maximum product width, but also consider possible product expansion in the next 2–3 years.
2. How many color stations? Enough current needs + some buffer
Flexo presses typically have 2 to 12 color stations (printing units). Common configurations are 4‑color, 6‑color, and 8‑color.
Selection principle
Number of color stations = current maximum colors + number of spot colors + 1–2 spare units
Recommendations
| Product type | Recommended stations | Remarks |
|---|---|---|
| 1–2 color bags (T‑shirt bags, courier bags) | 2–4 | Basic, enough |
| General food packaging, daily chemical bags | 4–6 | Mainstream configuration |
| High‑quality color packaging, multiple spot colors | 6–8 | Print everything in one pass |
| Very demanding (gradients, expanded gamut) | 8–10 | High‑end configuration |
Common mistake: More stations are not always better. Each additional unit increases machine cost by 10–20%, and many orders won’t use them. Idle stations are wasted investment.
Lisheng’s advice: Choose 1–2 more stations than your current most complex job. For example, if you now print up to 4 colors, go for a 6‑color press – then you can accept 5‑color or 6‑color orders in the future.
3. Plate cylinder system: conventional vs. sleeve
This is a configuration that many overlook, but it greatly affects daily operation.
Conventional plate cylinder
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One‑piece construction, heavier
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Plate change requires removing the whole cylinder
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Suitable for longer runs with fewer changeovers
Sleeve system
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Lightweight sleeves (about 1/3 the weight of conventional cylinders)
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Quick plate change, one person can do it
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Ideal for short‑to‑medium runs and frequent job changes
Selection advice
| Order type | Recommended system | Why |
|---|---|---|
| Mostly long runs (large batches, few changeovers) | Conventional | Lower initial cost, sufficient |
| Short‑to‑medium runs, frequent changeovers | Sleeve | Big efficiency gain |
| Mix of both | Sleeve | Better flexibility |
Lisheng’s standard: Full‑servo flexo presses come with a gear‑sleeve structure for fast and convenient plate changes, significantly reducing job changeover time.
4. Drying system: electric heating or hot air?
Drying is critical – especially for water‑based ink flexo printing.
Electric heating
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Fast warm‑up, precise temperature control
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Suitable for small batches and frequent product changes
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Relatively higher energy consumption
Hot air drying (adjustable frequency)
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Uniform heat, high drying efficiency
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Ideal for high‑speed, large‑batch production
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Works best with water‑based inks
Selection advice
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Small batches, many variants → electric heating for flexibility
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Large batches, high‑speed production → hot air is more economical
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Water‑based ink printing → must use efficient hot air drying
Lisheng’s configuration: All presses feature variable‑frequency adjustable hot air drying systems, supporting high‑speed water‑based ink printing with energy efficiency.
5. Drive system: mechanical vs. full‑servo
This is one of the most important decisions for long‑term performance.
Traditional mechanical drive
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Lower cost, mature technology
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Slower changeovers, accuracy degrades over time
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Suitable for tight budgets and less demanding applications
Full‑servo independent drive
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High precision (±0.08mm), fast changeovers (<15 minutes)
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20–30% lower energy consumption, consistent long‑term accuracy
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Ideal for mid‑to‑high end markets, frequent job changes, and quality‑focused operations
Selection advice
| Business model | Recommended drive | Note |
|---|---|---|
| Startup, limited budget, single product type | Mechanical | Sufficient, quick payback |
| Mainstream packaging, multi‑product runs | Full‑servo | Higher efficiency, lower long‑term cost |
| High‑end market, frequent changeovers | Full‑servo | Must‑have |
Lisheng’s view: Full‑servo costs 20–40% more upfront, but lower operating costs, better print quality, and longer accuracy make it the smarter long‑term choice.
6. Optional added‑value features
Choose according to your actual needs:
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Non‑stop automatic splicing – reduces downtime, increases productivity
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In‑line inspection system – real‑time quality monitoring, lowers waste
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Industrial IoT module – collects production data for management and optimization
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Chambered doctor blade – reduces ink evaporation, more environmentally friendly
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LEL energy‑saving hot air system – further reduces drying energy consumption
Tip: You don’t have to buy all options at once. Start with core features that match your current orders, and add upgrades later as needed.
7. Summary table: at a glance
| Product type | Recommended width | Recommended color stations | Plate cylinder | Drive |
|---|---|---|---|---|
| T‑shirt bags, courier bags | 600–800mm | 2–4 | Conventional/sleeve | Mechanical/full‑servo |
| Food packaging, daily chemical bags | 800–1000mm | 4–6 | Sleeve | Full‑servo |
| High‑quality color packaging | 1000–1200mm | 6–8 | Sleeve | Full‑servo |
| Woven bags, industrial packaging | 1000–1600mm | 4–6 | Conventional/sleeve | Mechanical/full‑servo |
8. FAQ
Q1: My current widest product is 600mm. Is 800mm width enough?
A1: Yes. The general rule is to add 100–200mm margin. 800mm gives you comfortable room for setup and operation.
Q2: 4 colors vs. 6 colors – how to choose? What if 4 colors won’t be enough later?
A2: If you mainly print 4 colors now, choose a 6‑color press. The extra stations can be used for spot colors, varnish, or future expansion. Buying once for 5–10 years is cheaper than upgrading later.
Q3: How much more does a sleeve system cost? Is it worth it?
A3: The sleeve system has a higher upfront cost, but it cuts plate change time by more than 50% and reduces manual labor. If you change jobs 2–3 times a day, the payback period is usually 6–12 months.
Q4: What is the standard configuration of Lisheng’s full‑servo flexo press?
A4: Standard features include: independent servo motor drive, gear‑sleeve plate cylinder system, variable‑frequency hot air drying, chambered doctor blade, one‑click pre‑registration, recipe storage, and an interface for in‑line inspection. Customization is available.
Q5: I’ve never bought a flexo press before – which configuration should I start with?
A5: A good starting point is: 6 colors, 800–1000mm width, sleeve system, and full‑servo drive. This covers most flexible packaging orders and gives you flexibility. If your budget is very tight, consider a mechanical drive machine, but make sure it allows future upgrades.
Conclusion: There is no one‑size‑fits‑all – but we can help you find your best fit
If you’re still unsure how to choose, you’re welcome to visit Lisheng Machinery with your products. Our engineers will analyse your actual requirements, recommend the most cost‑effective configuration, and even run test prints on your materials.
About Lisheng Machinery
Wenzhou Lisheng Printing & Packaging Machinery Co., Ltd. is based in Ruian, Wenzhou, Zhejiang Province, China. With nearly 20 years of manufacturing experience, we specialize in stacked, central‑impression (CI) and full‑servo flexo printing presses. Our products are exported to more than 90 countries and regions worldwide.
