Flexible Packaging Printing Methods and Artwork Guide

01

Start with the complete print program

Digital, gravure, and flexographic printing can all produce effective flexible packaging. The right choice depends on the artwork and the way the program will be purchased and managed. Quantity per design, number of SKUs, reorder pattern, film structure, color expectations, finishes, tooling, timing, and likely artwork changes should be reviewed together.

A single quantity cutoff can be misleading. A program with many designs may favor a different process than one stable design with the same total volume. The printing method also has to fit the selected film and the converting steps that follow printing.

02

Digital printing

Digital printing produces the image directly from a digital file without conventional printing plates or engraved cylinders. This makes it useful for launches, smaller quantities, multiple SKUs, versioned artwork, and programs that may change before demand is established.

A supplement brand with six flavors, for example, can divide an initial order among the designs without buying a separate set of printing plates or cylinders for every SKU. The brand can learn which flavors sell before committing to larger repeat quantities.

Digital printing does not remove the production steps that come after the image is printed. The film may still need lamination, cure time or thermal bonding when applicable, slitting, and conversion into pouches or finished roll stock. Available substrates, web dimensions, color gamut, white ink, specialty finishes, quantity, and converting limits should be confirmed before artwork is released.

03

Gravure printing

Gravure uses engraved cylinders to carry and transfer ink. The controlled cells in each cylinder can reproduce fine detail, smooth tonal transitions, strong solid coverage, and consistent repeat production.

The process requires cylinders and production preparation before printing begins. It is often a strong fit when the artwork is stable and the expected volume or repeat demand supports that investment. Gravure should not be limited to only extremely long runs. Current cylinder and production workflows can make it practical across a wider range of programs.

Evaluate the artwork, number of colors, film substrate, total quantity, quantity per SKU, expected reorders, cylinder cost, and timing as one program. A detailed design that will be reordered regularly may support gravure earlier than a simple design that is still changing.

04

Flexographic printing

Flexographic printing uses flexible relief plates and an anilox roll to meter ink. It can be a good fit for bold graphics, solid colors, typography, and line work. Modern plates, screening, anilox selection, color management, and process control have improved what the method can produce.

Flexography can be less forgiving than digital or gravure when artwork depends on very fine highlight dots, subtle vignettes, photographic screens, or smooth tonal transitions. Actual capability varies by printer, plate system, screening, anilox selection, substrate, artwork, color management, and process control.

A design built around bold spot colors and clear type may fit flexography well. A package that depends on fine photographic screens and subtle gradients may be better suited to digital or gravure after the program requirements are compared.

Tooling cost is job-specific. Depending on the artwork, number of colors, dimensions, and supplier, a flexographic plate set may cost more or less than a gravure cylinder set. Compare current quotes for the actual program.

05

How to select the printing method

Choose the process from the complete program. Review quantity per SKU, design count, reorder frequency, artwork complexity, colors and finishes, film structure, tooling, lead time, and the likelihood of future changes.

Digital often fits when speed, smaller quantities, many SKUs, or artwork changes matter. Gravure often fits stable artwork, repeat demand, larger quantities, fine detail, strong ink coverage, and tight repeat consistency. Flexography can fit recurring programs when the artwork and tonal requirements fall within the process window.

A brand launching six flavors might use digital printing to enter the market, then evaluate the best-selling designs for gravure after repeat demand becomes clearer. That does not create a universal quantity threshold. It shows how the best method can change as the program changes.

When a package moves from one printing method to another, review color, screening, ink coverage, separations, gradients, photographs, and proofs again. The same artwork file will not necessarily produce the same result through a different print process.

06

Define color targets and what the proof approves

Critical colors should be defined with a physical or measurable target rather than a computer monitor. The target may be a Pantone reference, Lab values, an approved production sample, or a contract proof. The approval plan should state which target controls when the references do not match.

Film changes how color appears. A color printed over opaque white can look different over clear film, white ink, metallized film, or a matte surface. Surface printing, reverse printing, lamination, and the final finish can also change density, gloss, and visual depth.

Packaging HQ Pacific, for example, may look different when printed on an opaque white film, over a white ink foundation, on metallized film, or under a matte finish. The color target and construction should be reviewed together.

A contract proof is useful, but it does not reproduce every condition of the production film, ink, lamination, finish, and press. For important brand colors, define the target, tolerance or visual approval method, proof type, lighting condition, and person authorized to approve.

07

Surface printing and reverse printing serve different needs

Surface printing places the ink on the outside of the package. The ink and any protective coating have to withstand the expected abrasion, moisture, temperature, chemicals, handling, and sealing conditions.

Reverse printing places the ink on the inside face of a clear outer film. Lamination then buries the ink between film layers. This is common when a laminate is needed and the graphics require protection from scuffing and handling.

Neither approach is automatically better. Surface printing can be the right choice when a laminate is unnecessary and the printed surface can meet the durability requirement. A surface-printed white cavitated OPP wrapper may fit a frozen novelty application. A pouch exposed to heavier handling and abrasion may benefit from reverse-printed graphics protected inside a laminate.

08

Process colors and spot colors

Process printing usually builds images from screened cyan, magenta, yellow, and black. A spot color uses a separately prepared ink to print a named color. Flexible packaging can combine process and spot colors in the same design.

A Pantone reference does not guarantee the same appearance across a process build, a mixed ink, and different film constructions. Substrate color, white ink, opacity, surface or reverse printing, lamination, and finish all affect the result.

A large Pacific brand field may be specified as a spot color in an analog print process while a product photograph is built from process colors. A digital press maps both within its available color gamut. Additional spot colors can affect tooling, available print stations, setup, and cost.

Expanded color gamut printing can reproduce a wider set of colors from a fixed ink set, but the artwork, separations, proofing, and printer controls must be aligned with that workflow.

09

Build artwork on the approved package geometry

Production artwork should use the approved dieline or web layout. Package dimensions, seals, gussets, folds, zipper, tear notch, repeat, eye marks, unwind direction, and print-free areas should be confirmed first.

Artwork files should include the required bleed, high-resolution linked images, named colors, organized layers, fonts or outlined text as requested, barcodes, and clearly identified white ink, varnish, metallic, matte, or tactile areas. File requirements vary by printer and print method, so use the production partner's current prepress instructions.

A zipper movement can shift the usable copy area. A barcode placed over a gusset, fold, seal, or distorted panel may not scan reliably. These structural details should be resolved before the final artwork is approved.

A PDF can look correct on screen and still be incomplete for production. Prepress review must be completed against the selected print method, film, package geometry, and converter requirements.

10

Treat finishes as part of the package specification

Matte, gloss, tactile coatings, varnishes, and metallic effects can change more than appearance. They may affect color perception, friction, scuff resistance, blocking, web handling, barcode readability, sealing, and converting.

A matte finish can soften the way a color appears and increase drag through guides or against adjacent packages. A tactile coating must withstand winding, pouch conversion, case packing, shipping, and consumer handling. Coatings and finishes should stay out of seal areas unless the complete construction is designed and tested for that use.

Evaluate the finish on the intended film and under the expected production and handling conditions. An attractive hand sample does not establish production durability or machinability.

11

Make the final approval specific

The final print approval should identify the exact artwork revision, printing method, substrate, orientation, color target, white ink, finish, and proof type. Each approval tool answers a different question. A PDF can confirm copy and layout. A contract proof can provide a closer color reference. A press proof or production sample can provide stronger evidence of the final materials and process.

A message that says only ‘looks good’ can leave the approved version unclear. Record the file name, revision, approval date, proof type, approved colors, known exceptions, and approval owner.

If the printing method, film, white ink, lamination, or finish changes after approval, review how the change may affect the graphics before releasing production.