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Stack vs CI Flexo Printing Machine: Key Differences

CI wins for thin PE/BOPP multi-color film register. Stack can still fit stabler webs, paper/board, or CapEx-first lines where stretch register is not the binding constraint. Pick architecture first, then drive (gearless vs geared).

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Written by: LISHG Technical Team · Reviewed by: Flexographic Printing Engineering Team · Last updated: August 2026

High-intent architecture decision: stack vs CI flexo printing machine. After you pick architecture, choose drive on gearless vs geared. Full path: buying guide.

Job reality Lean toward
Thin PE / BOPP multi-color film CI
Paper / simpler / CapEx-lean opportunistic Stack (when register tolerance allows)

Key differences · Budget · Materials · Colors · Scenarios · FAQ · Next

Key Differences

Factor CI flexo Stack flexo
Web support Continuous on one central drum Intermittent between stacked units
Thin-film register Typically stronger Harder when film stretches
CapEx tendency Higher drum-centric platform Often lower entry CapEx
Access / footprint Drum-centric layout Often simpler unit access

Budget

Do not buy stack just to save CapEx if thin PE multi-color register is the job — waste erases the sticker gap. CapEx-tight film plants still specify gear-driven CI before jumping to stack. Soft cost: price factors.

Materials

  • PE / thin BOPP → CI default for multi-color. PE · BOPP
  • PET / stabler film → CI still common; stack possible on simpler jobs
  • Paper / mixed opportunistic → stack often fits CapEx and access

Colors

More colors on stretchy film strengthen the case for CI (less free-span between stations). On stack, higher color counts increase unsupported path risk. Station count still follows artwork: 6 vs 8.

Scenarios

A — Flexible packaging film converter: CI · then gear/servo/gearless. Explore 6-color CI.

B — Paper + loose register, CapEx lean: Stack can win.

C — Vendor pushes “cheap gearless stack” for PE bags: Reject architecture mismatch; require CI for stretchy multi-color film.

FAQ

Is CI always better than stack for film?

For thin-film multi-color register, CI is generally preferred. Stack can suit simpler or more stable webs.

What after choosing CI?

Buying guide for width/colors/speed · gearless vs geared for drive.

Next Step

Why this machine

King Series

Based on your profile: Flexible packaging · Film, BOPP, PET, PE · 1000–1300mm · 350m/min

servo gear CI flexo
Process match

King Series is the strongest fit for Flexible packaging because Best fit when the plant runs high-speed film jobs and needs reliable register control, fast ramp-up, and strong production stability. At your target speed of 350m/min, this platform keeps register stable, startup waste low, and changeovers practical for repeat jobs.

Material fit

You selected Film, BOPP, PET, PE. King Series is engineered for thin film, BOPP, PET, PE. Core substrate window: thin film, BOPP, PET, PE. This reduces tension surprises and ink-transfer issues on your primary material.

Production envelope

Width target 1000–1300mm and speed 350m/min sit inside the King Series envelope (1000-1300mm, 300m/min). Budget Mid to high range and High automation align with very high-automation workflows at this output level.

Strengths & tradeoffs

Key advantages: Servo gear precision; low startup waste; strong register at speed. Tradeoff to confirm: Higher initial investment than Master or Honor, and not the primary choice for FFS heavy-duty sacks. If your mix shifts toward ultra-thin film at 400–500 m/min, compare with another LISHG line before finalizing.

Servo gear precisionlow startup wastestrong register at speed