A custom printed polyethylene bag specification requires more than a logo file. Confirm the bag construction first, then define the print method, number of colors, color targets, artwork placement, registration tolerance, copy, barcodes, ink exposure, proof process, and finished-package qualification.
Champion Plastics lists random-repeat, registered, process, and screen printing capabilities up to 10 colors, subject to review of the specific bag, artwork, and end use.
Lock the bag specification before artwork placement
Confirm material, dimensions, thickness, bag style, seals, gussets, vents, perforations, folds, and pack-out before finalizing the design. These features determine the printable area and where the image may be distorted, hidden, folded, cut, or obstructed.
If the bag changes size, material, seal, gusset, or orientation, do not automatically reuse the old artwork coordinates. Request a current dimensioned print-area drawing or dieline.
Choose random-repeat or registered placement
Random-repeat printing places the image at a repeating interval without guaranteeing one exact position on every converted bag. It can suit patterns, identification, or copy where precise alignment is not critical.
Registered printing aligns the artwork to a defined location on the bag. It is important when a logo, warning, barcode, window, seal, opening, or product panel must remain in a consistent position. Define acceptable movement in the machine and cross directions; words such as “centered” or “near the top” are not measurable.
Define colors and comparison conditions
Identify each color with an agreed reference and provide approved digital or physical standards when needed. Spot colors and process printing serve different design needs. Transparent, tinted, and opaque film—and the product visible through the film—can change perceived color.
Discuss whether a white backing or other treatment is needed for opacity. State whether color is judged before or after filling, under what lighting, and within what tolerance. Avoid promising an exact match across different substrates without an agreed comparison method.
Supply production-ready artwork
Vector artwork is generally preferred for logos, line art, and text because it can scale without losing edge quality. Package or outline fonts as appropriate, keep colors separated, and identify minimum line weights and type sizes.
- Final approved design and revision number.
- Bag outline, dimensions, print side, opening direction, and printable area.
- Color references and print sequence.
- Linked or embedded images and font handling.
- Distance from seals, edges, folds, gussets, perforations, and vents.
- Random-repeat or registered-placement requirement and tolerance.
- Variable information, warnings, regulatory copy, and barcodes.
- One authorized person responsible for final approval.
Keep regulated and customer-required copy under customer control
The customer is responsible for determining which product identifiers, ingredients, instructions, symbols, warnings, hazard statements, responsible-party information, or other legal and customer-required elements apply. Qualified personnel should approve the exact copy and graphics before plates or production.
The bag manufacturer should reproduce the approved artwork accurately according to the specification, but should not be expected to determine the customer's labeling obligations.
Design barcodes for a flexible, filled package
Flexible film can stretch, curve, wrinkle, fold, or distort after filling and sealing. Place the barcode on the flattest practical panel, away from seals, gussets, curves, and high-distortion areas. Protect the quiet zone, maintain adequate contrast, and orient the symbol for the expected scanner path.
Specify the data, symbology, size, magnification, colors, location, and required verification grade when applicable. Test the filled and handled package. A symbol that looks sharp on a flat proof may not scan reliably after the bag is loaded.
Review ink and end-use exposure
Describe abrasion, moisture, oils, chemicals, refrigeration, freezing, heat, sunlight, and repeated handling. Printing on an exposed shipping bag faces different conditions from printing on a protected inner surface.
For food, pharmaceutical, or chemical applications, identify whether direct contact, migration, cleanliness, or customer-approved ink documentation is relevant. A general printing capability does not establish that every ink and substrate combination is appropriate for every use.
Use a controlled proof and approval process
The approval sequence may include digital art, a dimensioned layout, color standards, preproduction samples, or a press proof, depending on complexity. At minimum, confirm:
- Correct artwork and revision.
- Bag dimensions, orientation, opening direction, and print side.
- Printable area and distance from converting features.
- Colors, sequence, and comparison standards.
- Random-repeat or registered placement and tolerance.
- Warnings, codes, identifiers, and legal copy.
- Barcode content, placement, and verification plan.
- Approver name and approval date.
Use revision control rather than relying on email attachments with similar filenames. Changes after approval can affect plates, tooling, schedule, samples, and cost.
Qualify the printed package
Run the printed bag through filling, sealing, labeling, scanning, packing, storage, and distribution. Check ink adhesion, rub resistance, legibility, registration, blocking, barcode performance, and any effect on seals, sensors, or handling.
Retain an approved sample, specification, and artwork revision. Define how future production will be compared and how any artwork or construction change will be approved.
What to send with a printed-bag quote
Provide the controlled bag specification, product and end use, artwork files, color references, random-repeat or registered placement, number of colors, print location, warnings and codes, barcode requirements, ink exposure, proof expectations, quantity, pack-out, delivery timing, and qualification plan.
Discuss your specification with Champion Plastics
Champion Plastics manufactures custom printed polyethylene bags and films in Clifton, New Jersey. Call 800-526-1230 or submit the bag specification and artwork through the quote form to review printing, samples, approvals, quantity, and timing.