how flexo press adjusts print to cut | Keshenglong&Shinko Guide

How Flexo Press Adjusts Print to Cut: Achieving Perfect Register

Flexographic printing requires precise registration between print and cut. This article explains how flexo presses achieve this crucial alignment, addressing common challenges faced by print professionals. We'll explore the key mechanisms and adjustments involved in ensuring your final product is flawless.

Understanding the Print-to-Cut Process

Achieving perfect register in flexographic printing means the printed image aligns precisely with the die-cut or converting process. Misalignment leads to wasted materials, off-spec products, and ultimately, dissatisfied customers. The process involves several interdependent steps and adjustments on the flexo press.

Key Adjustments for Precise Print-to-Cut Registration

Several components on a flexo press work together to ensure accurate print-to-cut registration. These include:

* Impression Cylinder Adjustment: This controls the pressure between the printing plate and the substrate. Incorrect impression can lead to inconsistencies and affect register.

* Lateral Register Adjustment: This involves side-to-side adjustments of the print cylinders to align the image horizontally. Fine-tuning is often necessary for precise control.

* Longitudinal Register Adjustment: This focuses on vertical alignment, correcting any discrepancies between the print and the cutting path. Careful monitoring is crucial for consistent results.

* Web Guiding: Maintaining consistent web (material) path is crucial for good register. A properly functioning web guide system minimizes lateral shifts during printing.

* Pre-registering the Print Plates: Accurate pre-registering of your flexo plates is a fundamental step before mounting them on the press. Any errors at this stage will propagate downstream.

Troubleshooting Common Registration Issues

Even with careful setup, registration problems can arise. Common issues include:

* Stretching or Shrinking of the Substrate: Variations in material properties can influence the final outcome, requiring adjustments to compensate for these changes.

* Mechanical Wear and Tear: Regular maintenance and inspection of the press components are essential to prevent wear and tear that can affect precision.

* Inconsistent Ink Viscosity: Improper ink viscosity leads to variations in print length and width, directly impacting registration.

Addressing these issues often requires systematic checks and adjustments, careful observation of the printed output, and fine-tuning of the press settings based on the specific problem.

Maintaining Optimal Print-to-Cut Registration

Consistent monitoring and proactive maintenance are key to maintaining optimal print-to-cut registration. Regular calibration, diligent operator training, and the use of quality materials are crucial for success. Utilizing advanced technologies like register control systems can also significantly improve accuracy.