Die Cut Tape Supplier Due Diligence: 10 Checks Before Tooling

Technical guidesPublished 07 November 2026Updated 07 November 2026

Ten questions separate a die cut tape supplier who owns the process from one who forwards drawings, and every question has a document, a photograph or a physical part as its answer. We convert on our own slitters and cutters in Shenzhen, which is why we can answer all ten from records rather than phone calls. Run the list before tooling money moves.

1. Who owns the tooling once you have paid for it?

Ask what happens to the flat-bed plate or rotary rule after the order closes: whose name is on it, where it is stored, what it costs to retrieve it, and whether it travels if you move the work. Tooling is quoted as its own line here, and ownership and storage terms go in the agreement before it is cut, because a die you cannot recover is a supplier you cannot leave.

2. Which cutting route do you recommend, and why that one?

Ask for the route and the reason together. A supplier who answers "flat-bed, because your part is multi-layer with a tight inside corner" has looked at the drawing; one who answers with a price has looked at the calendar. The routes we run — flat-bed, rotary, laser, CNC — behave differently by material and outline, listed on the die-cutting page, and the recommendation should be falsifiable by a competitor's engineer reading the same drawing.

3. How does the waste matrix come away?

Ask them to show you, on your geometry. On open shapes matrix stripping is routine; on small parts at tight pitch the waste webs break, curl into the die or lift the good parts with it. Options are stripping stations, micro-perforation, cut-pattern changes or laser ablation, and each one moves price and yield. This check most reliably separates shops that run small parts from shops that mostly run big ones.

4. What does the first-article report actually contain?

Ask for a sample report with the identifying parts redacted. A useful FAI states each measured dimension against the drawing revision, the method and the gauge or optical system, plus a visual record of edges and corners at magnification. We issue first-article reports for drawing-based projects, and the report is where tolerance promises either survive contact with the part or do not.

5. How is tolerance stated on the quotation?

Watch the wording. "Standard tolerance" is a sentence doing no work; capability that means something is reviewed per material, thickness, part size and cutting route and then stated against your drawing before tooling is cut. If the supplier will not write it against the revision, the number does not exist. Our walk-through of how to put tolerance on an adhesive-part drawing is in the die-cutting tolerance guide.

6. Which liner and release levels can you offer?

The liner is not packaging on a converted part; it is an interface. Ask whether PET film and glassine are both available, in what thicknesses, at what release levels, and whether release is quoted with a test method. A part that releases cleanly from a prototype liner can sit permanently on a production one, and the failure shows up at the applicator, weeks after anyone could have predicted it.

7. Can a rejected part be traced backwards?

Give a reel number at random and ask what the supplier can tell you about it: source film lot, adhesive batch, slit date, cutting order, inspection record. Our batch records run from incoming material through slitting and cutting to the packing label, described on the quality page; a converter who cannot walk that chain is holding someone else's records, not theirs.

8. Who notifies you when something changes?

Source film, coat, liner and cutting route all move without changing a part number. Ask for a written change-notification term covering those four, and for approval to sit with you before a change runs rather than in an explanation after it ships. Where the material is branded, the authorization scope for your market and product family is confirmed per enquiry — a one-line answer that predicts how the rest of the paperwork is handled.

9. Which steps happen under the roof you are visiting?

Ask what is in-house and what is subcontracted: slitting, lamination, cutting, stripping, packing. Every handoff adds a lot the supplier cannot see. We slit, laminate and cut our own stock in our Shenzhen plant, with the Longmen site planned and under construction; for a die cut tape supplier running the same part across three workshops, the batch question in item 7 never has a clean answer.

10. How do you inspect small features on a soft part?

A 3 mm square with one rounded corner punishes vague QC. Ask what gets measured, at what magnification, against what image, and how often inside the run; ask what a chipped die edge looks like in their records before it looks like that on your line. End-of-bin visual sampling is an inspection of hope that nobody admits buying until the audit.

The document set to ask for, per project

Technical data sheet for the ordered construction with its test methods; safety data sheet; RoHS and REACH statements scoped to that material; a first-article dimensional and visual report against your drawing revision; and the batch record linking each delivery to incoming lot, cut date and inspection. ISO 9001 exists here as certificate and audit scope provided on request. A per-project folder beats a catalogue: the catalogue says what a supplier sells; the folder says what they will defend.

To see these ten answers in writing, send a drawing or a sample reel; we reply against your part, not against the list.

Commercial and process terms on this page are the questions a converter has to answer, not a standing offer. Order quantities, lead times, tooling charges, sample terms, freight and payment structures are confirmed at quotation against your drawing, your material and your destination, and only figures already published elsewhere on this site are stated as commitments.