---
title: 1200mm Variable Length Flexo Press for Bags
date: 2026-07-28T08:56:52Z
modified: 2026-08-15T13:55:24Z
permalink: "https://www.zp-flexopress.com/news/product-info/variable-length-flexo-press/"
type: post
status: publish
excerpt: ""
wpid: 1932
categories:
  - Product info
featured_image: "https://www.zp-flexopress.com/wp-content/uploads/2026/07/cover-1.webp"
featured_image_alt: 1200mm variable length flexo press with direct drive servo motors for non-cylinder change bag printing
timestamp: 2026-08-15T13:55:24Z
tags:
  - Product info
---

## Quick Answer

A 1200mm 2-color variable length flexo press uses direct-drive servo motors on the plate cylinder to print multiple bag sizes without changing cylinders. The servo adjusts cylinder speed only after the plate disengages from the web, controlling the gap between printed repeats. This eliminates tooling investment and storage. Operators change parameters via HMI in seconds. RAZP, a trusted manufacturer of CI and Stack flexo printing machines, builds this system for high-mix, short-run bag production.



In traditional packaging and bag manufacturing, changing bag lengths requires replacing the plate cylinder with one of matching circumference. This traditional process incurs heavy tooling investments, dedicated cylinder storage, and significant idle time during mechanical changeovers.

To eliminate these constraints, the 1200mm 2-color [variable length flexo press](https://www.zp-flexopress.com/products/) uses direct-drive servo motors on the plate cylinder. This allows a single plate cylinder circumference to print multiple distinct bag sizes on the same continuous line.



## Core Advantage: Multi-Length Printing with a Single Cylinder

The primary technological advantage lies in the servo-controlled speed adjustment phase. During actual ink transfer, the plate cylinder rotates at a 1:1 speed synchronization with the moving web.

The core efficiency breakthrough occurs immediately after the printing plate disengages from the substrate:

- **Variable Speed Modulation:** Once the plate disengages from the fabric or film, the independent servo motor automatically accelerates or decelerates the cylinder before starting the next print cycle.
- **Seamless Size Switching:** By dynamically controlling rotation speed during the non-printing phase, the machine adjusts the gap between printed repeats according to the programmed bag length.

This dynamic mechanism enables converting plants to handle custom and short-run bag orders without acquiring, storing, or swapping specialized cylinder sets.

## Structural Stability & Register Precision

Executing rapid cyclic speed changes across 1200mm web widths requires rigid structural isolation to maintain print register accuracy.

Web tension is precisely isolated between the unwind system, the servo-driven plate cylinder, the drying duct, and the rewind unit. Heavy-duty frame construction absorbs dynamic motor torque during speed transitions. High-precision optical encoders monitor real-time cylinder positioning, ensuring consistent color-to-color register tolerances.

## Measurable Business Benefits

- **Eliminated Cylinder Investment:** A single plate cylinder handles multiple bag dimensions, significantly lowering capital expenditure on tooling.
- **Instant Parameter Changes:** Operator changeovers occur on the HMI touch panel in seconds, drastically increasing overall machine capacity.
- **High-Mix Flexibility:** Simplifies small-batch production for non-woven packaging, plastic bags, and paper converting lines.

By shifting repeat length control from fixed mechanical gears to dynamic servo software, this no cylinder change flexo press provides flexible packaging converters with an efficient operational solution.

[Get a Quote](https://www.zp-flexopress.com/wp-content/uploads/wp-mfa-exports/page/contact.md)