Screen and Pad Printing Directly on Containers: A Practical Guide

How Each Process Actually Works on a Container

Screen printing starts with a mesh screen stretched on a frame. A stencil blocks parts of the mesh, and a squeegee forces ink through the open areas onto the container. Ink deposit and opacity depend on the screen, ink, substrate and printing conditions. Request a printed sample when an opaque light color over a dark container is important.

Pad printing transfers ink from an etched image on a plate to the container using a flexible silicone pad. The pad can accommodate some irregular surfaces, but access, distortion and coverage depend on pad geometry, image size, container shape and fixturing. Have the decorator assess shoulders, tapers and compound curves rather than assuming they are printable.

• Screen printing: ink passes through a mesh stencil; ask about flat-panel or cylindrical printing equipment suited to your container
• Pad printing: a silicone pad transfers ink from an etched plate; ask whether the pad and fixture suit your image and surface
• For a spot-color job, additional inks generally require additional image carriers and printing operations; confirm the decorator's station and pass arrangement

Choosing Between Screen and Pad Printing

Compare surface geometry, image size, quantity, required appearance and the decorator's equipment. Ask the decorator to evaluate screen printing for broad graphics and pad printing for smaller images or irregular surfaces. Cylindrical screen-printing equipment can accommodate rotation, but achievable coverage and any seam or gap depend on the setup. Do not assume pad printing can produce a full wrap, even on a small diameter. Provide the actual container and artwork for a coverage and distortion assessment.

Artwork Preparation and Separations

For a spot-color job, we recommend clean vector artwork with consistently named spot inks. Ask whether the decorator wants composite artwork or supplied separations; a layer is not itself an ink separation. Fine reversed text and small counters may close up, so confirm minimum line weights, reversed type sizes, trapping and knockout settings before finalizing. Do not assume a spot-only workflow if the decorator specifies another color process.

Adobe notes that industry associations such as the Ghent PDF Workgroup recommend PDF and PDF/X for exchanging packaging and label jobs. Ask your decorator which file format and PDF/X version they want; their requirements govern output, marks and dieline or separation setup. We recommend keeping one approved PDF per version so separations, finishing notes and ink names stay synchronized. Acrobat Pro Output Preview can show separations and spot plates and can limit the view by source color space, for example to see whether a page contains RGB color or where a spot color is used, which is a useful check before handoff.

• For spot-color work, use named spot inks and supply vector artwork where practical, following the decorator's separation instructions
• Ask the decorator for minimum line weight, minimum reversed type size and trap allowance
• Keep a version with editable layers in case prepress needs adjustments
• Check the PDF against the agreed ink and color-management workflow. Flag unintended process or RGB objects, but do not reject managed RGB solely because it is present; PDF/X-4 can contain it.

Ink Systems and Container Materials

Ink chemistry should be matched to the substrate. Systems decorators may offer include solvent-based inks, UV-cured inks and ceramic inks fired onto glass. Some plastics, such as polyethylene or polypropylene, may need surface treatment such as corona or flame treatment, or a primer, before ink adheres well; ask your decorator whether your container needs pretreatment and whether curing or baking is required.

Ask the decorator which ink system they run for your material, what adhesion testing they perform, and whether the ink needs to survive dishwashing, alcohol exposure, abrasion or outdoor UV. Adhesion and durability claims should come from testing on your actual container, not from generic ink data sheets.

• Solvent inks: used on many plastics; adhesion and drying depend on the specific ink and substrate
• UV inks: cured under UV lamps; opacity and adhesion depend on the formulation
• Ceramic inks for glass: require a compatible firing process; confirm suitability and tested durability with the decorator
• Confirm whether the container needs pretreatment before printing

Registration, Tolerances and Proofing

Direct-to-container printing registers color to color on a curved, sometimes flexible object, and achievable registration depends on the machine, fixturing and part stability. Ask your decorator for their specified registration tolerance rather than assuming a number, and design accordingly: we recommend avoiding hairline gaps between colors, using traps where colors meet as the decorator advises, and keeping critical elements away from the edge of the print area.

On-screen separation preview helps catch problems early but has limits. Adobe documents that monitor separation previewing does not show trapping, emulsion options, printer marks, halftone screens or resolution, and that these settings are best verified with the print provider using proofs. So treat the digital preview as a structural check and get a physical proof or a first-article printed container before approving the run.

• Use traps between adjacent colors only as specified by the decorator
• Keep text and logos clear of print area edges
• Request a printed first article on the actual container
• Verify trapping and screening questions with the decorator, not on screen

A Hypothetical Cost Comparison Exercise

For a hypothetical two-color job on 500 jars, compare quotes using the same artwork, container and acceptance criteria. If a decorator quotes setup S per color and running cost R per jar per color, the modeled total is 2S + 1,000R. The modeled cost per jar is that total divided by 500. This formula is only appropriate when the quote uses those billing units.

Apply the same calculation to each feasible process using actual quoted charges. Confirm whether fixtures, pretreatment, curing, proofs, additional operations and other charges are included. If the image exceeds the pad's usable print area, ask whether the job is feasible at all; extra impressions are not automatically a workable solution. Compare only options that meet the same coverage and quality requirements.

Some suppliers may charge setup or plate fees per color, including on reruns, so ask. Teal does not charge setup, plate or tooling fees, which removes that line from the comparison; actual Teal pricing is quoted per project.

• Model setup plus per-unit cost for both processes at your true quantity
• Check whether setup fees recur on reorders at other suppliers
• Confirm the decorator's usable pad print area, surface access and acceptable distortion before comparing pad pricing

Handoff Checklist for a Direct Print Job

This checklist is Teal's editorial planning framework for preparing a screen or pad print handoff. The underlying principles around PDF preparation, separation preview and spot color handling are documented by the cited Adobe references, but the checklist itself is our recommended workflow.

• Confirm container material, dimensions, surface geometry and print zone
• Get the decorator's spec sheet: mesh or plate specs, minimum line weight, registration tolerance, trap values
• Supply artwork and named inks in the decorator's requested format; confirm whether composite files or separate color files are required
• Verify the PDF contains only intended inks using a separation preview
• State ink system, finish such as gloss or matte, and durability requirements in writing
• Request a first article on the actual container before the production run
• Confirm cure or firing requirements and any pretreatment needed
• For reruns, confirm whether setup or plate fees apply again

Scope and Limits

This guide covers planning for screen and pad printing on rigid containers such as bottles, jars and tins. It does not cover flexible pouches, pressure-sensitive labels, shrink sleeves or in-mold decoration. The cited Adobe sources support the PDF guidance, not comparative container-printing performance or material compatibility. Confirm adhesion and durability through an agreed testing plan for the actual ink and container. Food-contact suitability and regulatory compliance require application-specific review and documentation; child resistance concerns the complete package and closure, not the printing method. This article makes no compliance determination. The cost exercise is symbolic, not a quote. Actual projects are quoted individually. Teal's standard minimum order is 50 units, or 100 for specialty rigid work where relevant.

Questions about screen and pad printing for direct container decoration