How should you choose a PET tape liner for manual or automated assembly?

Describe the operation first

Before requesting samples, explain how the tape will move through the line. Is it applied by hand, picked from a sheet, dispensed from a roll, laminated onto a web, or supplied as a die-cut part? State the operator’s access to the liner, the removal direction, the order of assembly, and whether placement must be visible through a fixture or camera.

For manual placement, the important questions may include whether the liner can be gripped easily, whether a release tab is needed, and whether the tape remains flat while the part is positioned. For automated application, ask whether the liner and converted geometry can be presented consistently to the equipment. These are process questions to validate, not assumptions about a particular liner’s performance.

Compare the listed liner options against process needs

The PET product entry lists white paper, MOPP red film, and yellow grid paper. Ask the supplier to identify which option is available for the exact PET model and requested converting format. Confirm the liner’s dimensions, print or grid details if relevant, and whether it remains compatible with the planned die-cut or slit geometry. For current constructions and listed applications, see the Double Sided PET Tape product page.

Color may make identification easier, but it does not prove release force, dimensional stability, machine compatibility, or cleanliness. If those properties are important, request the relevant specification or evaluate them on samples. Do not infer a property from the liner’s name or appearance.

Consider placement and registration

For narrow bond lines or visible areas, record the target position and permitted offset. Provide a part drawing that shows edges, holes, tabs, and keep-out zones. If an operator uses a visual mark or grid for alignment, state that requirement explicitly and confirm it on the delivered liner. A catalogue listing of yellow grid paper does not establish a particular grid pitch or registration tolerance.

For shaped parts, inspect whether the tape stays attached to the liner during handling and whether it releases as expected at the point of application. Check small corners and narrow features; a broad flat sample may not represent a detailed die-cut.

Trial the liner in the actual workflow

Run a small trial using the intended equipment, speed, handling sequence, and operators. Record missed picks, liner tears, premature release, curling, static or contamination concerns, placement accuracy, and any time spent correcting parts. Use the same tape construction and part geometry when comparing liner candidates.

For a roll-fed process, specify the required core, outer diameter, winding direction, and roll length. For a sheet or die-cut process, provide part pitch, carrier layout, tab requirements, and waste-removal method. The catalogue lists 1040 mm and 1240 mm master widths, but the finished format still needs separate confirmation.

Make the supplier request specific

Include the tape model or thickness range, substrate pair, finished width, liner preference, converted shape, application equipment, placement tolerance, monthly volume, and sample quantity. Ask the supplier to state whether the requested liner combination is available and what details remain unconfirmed. If the line is automated, send a short process video or equipment description when permitted.

After the trial, document both adhesive and liner observations. A bond can be acceptable while the liner causes handling problems; the opposite can also happen. Record these as separate outcomes so a process issue does not get mistaken for an adhesive issue.

When describing liner and supply options, keep the request tied to the listed PET tape constructions and the assembly context in the PET tape selection guide.

Approval checklist

Before releasing a purchase specification, confirm the exact model, liner, roll or converted format, and approved drawing revision. Verify that the sample passed the buyer’s placement and assembly checks. Keep the report linked to the tested lot and process conditions, and repeat the evaluation if the liner, part geometry, equipment, or application sequence changes materially.

This approach turns liner selection into a verifiable production decision. It also prevents a color or catalogue shorthand from being treated as a complete process specification. With those details ready, Request a PET tape quote or sample.

Common liner-selection mistakes

One frequent mistake is choosing a liner by color because it is easy to identify in a photograph. Color alone does not tell the buyer how the liner will behave on a dispenser, how it releases, or whether it can support a specific converted geometry. Another mistake is approving a flat hand-applied sample when the production line will feed a roll or pick small parts from a carrier. The sample format should reflect the intended workflow. For broader model and specification context, read the PET Tape: Specs, Uses & Selection.

Record the trial operator’s observations separately from bond results. If a part is misplaced because the liner tears or releases early, that is a process-handling observation. It should not be reported as an adhesive bond failure. Conversely, a smooth liner release does not establish that the finished joint meets its load or durability target.

Where more than one liner remains possible, compare them with the same tape model, converting layout, and equipment setup, then document the selected option on the approved drawing and purchase specification.