When a simulated-process print does not look right, the press is often the first thing blamed.
The printer may adjust the squeegee pressure, change the print sequence, add another stroke, increase the flash time or start changing inks. Sometimes those adjustments help—but many simulated-process problems begin long before the screens are placed on the press.
A successful simulated-process print depends on a complete production system:
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Production-ready artwork
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Professional color separations
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Correct halftones
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Proper mesh selection
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Dense film positives
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Accurately prepared screens
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Compatible ink colors
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A planned print sequence
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Controlled press settings
The press can reproduce a well-prepared image, but it cannot restore information that was lost during artwork preparation, separations, film output or screen exposure.
That is why great simulated-process printing starts before the press.
What Is Simulated-Process Screen Printing?
Simulated-process printing uses individual spot-color inks and halftones to reproduce artwork that appears to contain far more colors than are actually being printed.
Instead of trying to print every visible color separately, carefully selected ink colors overlap and interact with one another. The halftones allow the shirt color, underbase and printed colors to work together to create additional shades, highlights, shadows and transitions.
This method is especially effective for:
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Photorealistic artwork
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Detailed illustrations
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Fine-art reproductions
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Dramatic graphics on dark garments
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Designs with complex highlights and shadows
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Artwork containing more colors than the press can accommodate
The finished print may look complicated, but the process must be carefully organized.
The organization begins with the separation.
The Separation Is the Production Blueprint
A simulated-process separation is more than breaking artwork into several colors.
The separator must decide:
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Which colors are truly needed
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Which colors can be created by overlapping inks
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Where the garment should show through
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How much white underbase is needed
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Where a highlight white should print
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How each color will interact with the colors below it
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Which colors should print first
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How the image will behave on the selected garment
Every separation affects the number of screens, setup time, registration difficulty, ink requirements, production speed and final appearance.
Using more colors does not automatically create a better print. A strong separation aims to reproduce the artwork accurately with the most efficient color set for the job.
Kolormatrix Professional Simulated Process Separations are designed around real screen-printing production. The service includes production-ready spot-color separations, underbases, highlight whites and color corrections based on the requirements of the artwork.
A press operator should receive a usable production plan—not simply a collection of grayscale channels.
Start With the Final Garment
Before the artwork is separated, the printer should know what the image will be printed on.
Important questions include:
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What color is the garment?
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Is it cotton, polyester, fleece or a blend?
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Is the fabric smooth or textured?
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How large will the image be printed?
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Is a soft hand important?
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How many colors can the press accommodate?
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Will the design require a white underbase?
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Does the garment create a dye-migration concern?
The same artwork may need a different separation for a black cotton shirt than it would for a red polyester performance garment.
Garment color becomes part of the printed image. When used correctly, the shirt can create shadows, outlines and negative space. When ignored, it can shift colors, reduce contrast and change the entire appearance of the design.
Preparing the separation for the actual garment gives the printer a much better starting point.
Good Source Artwork Still Matters
Simulated-process printing can reproduce incredible detail, but it cannot manufacture detail that does not exist in the source image.
For the best results, artwork should be:
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Created at the final print size
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At least 300 PPI for raster artwork
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Clear and properly focused
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Free from unnecessary compression
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Balanced for brightness and contrast
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Large enough to preserve important details
Higher-resolution artwork may be especially helpful when the image contains fine hair, texture, smoke, small highlights or detailed facial features.
Upscaling a small, damaged image may improve its appearance, but it does not always recreate every detail accurately. Starting with the best available artwork reduces corrections and gives the separator more usable information.
Halftone LPI and Mesh Count Must Work Together
Halftones are the foundation of simulated-process printing. The dots must be fine enough to reproduce detail but strong enough to survive screen exposure and production printing.
The halftone ruling cannot be selected separately from the screen mesh.
As a general starting point, screen mesh count is often approximately 3.5 to 4 times the halftone LPI. A 60 LPI separation, for example, is commonly paired with mesh in the neighborhood of 230 to 280 threads per inch.
That is a starting point—not an absolute rule.
The final decision can also be affected by:
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Mesh thread diameter
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Mesh tension
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Ink viscosity
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Ink opacity
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Stencil thickness
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Garment texture
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Exposure quality
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Desired ink deposit
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Press setup
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Printer experience
The underbase may also require a different mesh from the top colors. The underbase needs enough opacity to support the image without filling the open areas, spreading into the shadows or creating a heavy print.
Our guide to screen-printing mesh counts explains how mesh selection affects detail, opacity, ink deposit and hand feel.
Film Positives Must Hold the Detail
A good separation can still fail if the film positives are weak.
Professional simulated-process films should provide:
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Dense black image areas
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Sharp halftone dots
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Clean edges
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Consistent output
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Accurate sizing
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Matching registration marks
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Correct image orientation
Film that does not block enough exposure light can allow light to penetrate the image areas. That may reduce small dots, weaken fine detail and make the stencil difficult to wash out correctly.
Inconsistent scaling between films can create a registration problem that no amount of micro-adjustment can completely correct.
Kolormatrix offers both standard and oversized Film Positive Output Services, including professional RIP output and film positives up to 24 inches wide.
Outsourcing film output can also eliminate the expense and maintenance associated with keeping a dedicated inkjet printer, RIP software and all-black ink system operating correctly.
The Screen Must Reproduce the Separation
The screen is where digital artwork becomes a physical stencil.
For simulated process, that stencil must hold very small halftone dots while allowing the ink to release cleanly during production.
Screen quality depends on:
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Proper mesh selection
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Good mesh tension
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Consistent degreasing
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Even emulsion coating
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Complete screen drying
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Strong film contact
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Correct exposure
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Controlled washout
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Thorough post-exposure drying
Underexposure may create a weak stencil that breaks down during production. Overexposure may make fine dots difficult to wash out. Poor film contact can soften the image and reduce halftone definition.
The screen may technically expose and wash out while still being unsuitable for a detailed simulated-process job.
Kolormatrix Photo Screen Service provides professionally coated, exposed, washed-out and production-ready screens. This can be especially valuable for printers who do not have a controlled darkroom or who need reliable screens for demanding work.
A shop can outsource the complete screen or combine professional film output with its own coating and exposure workflow.
Ink Colors Must Match the Separation
The separation and ink set must work together.
Changing an ink color can change the appearance of every area where that color overlaps another ink. A blue that appears close in the bucket may create completely different purples, shadows or neutral tones in the finished print.
Simulated-process inks also need the right balance of:
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Color strength
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Transparency
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Opacity
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Printability
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Wet-on-wet performance
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Body and viscosity
An ink that is too opaque may cover colors beneath it instead of interacting with them. An ink that is too transparent may look weak on the underbase. Excessively thick ink may require more pressure, which can distort halftones and increase dot gain.
Whenever possible, use the ink recommendations supplied with the separation or communicate your available ink system before the artwork is separated.
The Underbase Should Support the Image
The underbase is one of the most important screens in a simulated-process print.
Its purpose is to create the foundation for the top colors while preserving the darker areas and negative space in the artwork.
An underbase that is too heavy can create:
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A thick, rubbery print
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Longer flash times
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Poor wet-on-wet performance
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Excessive dot gain
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Muddy shadows
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Reduced detail
An underbase that is too light may produce dull top colors and weak highlights.
The goal is controlled support—not simply maximum white coverage.
A well-prepared underbase works with the top colors, highlight white, garment and print sequence to build the final image.
Print Sequence Should Be Planned Before Setup
Color order affects how inks interact on the shirt.
The best sequence depends on the separation, ink system and desired result, but the sequence should be established before the press operator begins registering screens.
The operator should know:
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Which screen is the underbase
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Whether the underbase is flashed
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Which colors print wet on wet
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Where a cooling station may be needed
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When the highlight white prints
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Which colors are most sensitive to contamination
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Whether a smoothing screen is part of the workflow
Moving colors around at the press can change the appearance of the design.
A good separation provides the press operator with an organized path instead of forcing production decisions to be made through trial and error.
Press Problems That May Actually Be Prepress Problems
Some production issues appear to be press problems even though their cause began earlier.
Colors will not register consistently
Possible prepress causes:
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Films were output at slightly different scales
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Screen tension varies significantly
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Frames are distorted
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Registration marks do not match
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Artwork was not positioned consistently
Fine dots disappear
Possible prepress causes:
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Film density is too low
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Exposure is too long
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Mesh is too coarse
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Emulsion coating is too thick
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Source artwork lacks sufficient resolution
Highlights fill in or shadows become muddy
Possible prepress causes:
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Halftone dots are too small for the screen
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Underbase coverage is excessive
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Separation curves are not suited to production
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Ink colors do not match the separation
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Mesh and LPI are not compatible
The print feels too heavy
Possible prepress causes:
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Underbase is too solid
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Mesh counts deposit too much ink
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Too many colors are being used
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Separation does not take advantage of the garment color
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Stencil thickness is excessive
Press adjustments may reduce a symptom, but correcting the underlying preparation produces more repeatable results.
A Practical Prepress Checklist
Before placing the screens on the press, confirm:
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Artwork is at final print size
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Garment color and fabric are known
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Separations are production-ready
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Ink colors have been selected
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Mesh counts match the halftone requirements
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Film positives are dense and correctly scaled
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All films use matching registration marks
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Screens are properly exposed and washed out
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Small dots and fine details are open
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Pinholes have been blocked
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Screens are dry and taped
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Print sequence is documented
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Underbase, flash and highlight-white requirements are understood
Completing these checks before setup can save far more time than trying to troubleshoot an entire color set on the press.
You Do Not Have to Outsource the Entire Process
Every shop has different strengths.
One printer may create excellent artwork but struggle with film density. Another may produce strong films but lack a controlled darkroom. A growing shop may have capable employees but insufficient screen-room capacity during busy periods.
A hybrid workflow allows the shop to keep the production steps it handles well and outsource the steps creating delays or inconsistent results.
Kolormatrix can assist with:
You can order a single service or build a more complete artwork-to-press workflow.
Learn Simulated Process by Printing It
Simulated process is difficult to learn from videos and color charts alone.
You need to see how the halftones interact, how the underbase supports the colors, how the print changes with each screen and how small press adjustments affect the finished image.
Simulated-process printing is a major part of Day Two in the Kolormatrix 3-Day Professional Screen Printing Class.
Students work through the process hands-on, including:
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Halftone fundamentals
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Separation concepts
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Screen preparation
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Registration
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Ink sequencing
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Underbase control
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Soft-hand production
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Troubleshooting
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Printing the finished design
The goal is not simply to produce one impressive shirt during class. The goal is to understand the workflow well enough to reproduce professional results in your own shop.
Better Preparation Creates Better Printing
A great simulated-process print may come off the press, but it is built during prepress.
Artwork quality, separation strategy, film density, mesh selection, exposure, ink choice and production planning all contribute to the final result.
When those pieces work together, press setup becomes faster, registration becomes easier and the finished print becomes more predictable.
Before changing another press setting, step back and examine the complete workflow.
The solution may be waiting before the press.
Ready to Improve Your Next Simulated-Process Print?
Kolormatrix can help with individual production steps or provide a more complete artwork-to-press solution.
Order Professional Simulated Process Separations, explore our Film Output Service, order Production-Ready Photo Screens, or learn the complete process in our 3-Day Professional Screen Printing Class.
Need help deciding which services fit your shop? Call Kolormatrix at 404-691-0015. Our team will help you build a workflow around your equipment, experience and production needs.