Footwear Ink Sample Approval: Checks Before a Production Order
Approve a footwear ink sample against the actual shoe material, the complete printing system and the tests agreed for the finished component. Record how the sample looks after printing, after the intended production steps and after the specified conditioning and tests. This gives purchasing and technical staff a clear basis for deciding whether to proceed to a production trial.
Start with the material and printing route
Give the supplier the material type, component, surface finish and intended printing method. Where possible, use a sample from the material intended for production. A change in the material supplier or surface treatment should be raised before relying on an earlier approval.
- EVA printing ink: distinguish water-based screen printing, solvent-based screen printing and the separate sole-spray route. The supplied YR-E sheet identifies a water-based EVA screen-printing ink.
- TPU printing ink: confirm the exact component and grade. HTPU is documented as a water-based polyurethane ink for TPU and listed applications; the finished component still needs a trial.
- Nylon printing ink: identify any water-repellent finish. SND solvent-based nylon ink and the separately documented water-based ink for water-repellent nylon are different selection routes.
- Water-based footwear inks: specify the material and full product name. The system description alone does not identify a suitable grade.
Confirm the complete system before preparing the sample
Record the ink grade and batch, any treatment or base layer, the exact hardener or crosslinker, permitted adjustments and any finishing layer. Ask for the current grade-specific TDS and SDS through the technical document request route.
The supplied technical collection leaves some hardener identities, addition bases, drying durations and test methods incomplete. Obtain the missing instructions for the selected system before mixing or setting trial conditions. Shelf life describes the stored product; the working time after mixing needs its own confirmation.
Use a staged sample approval record
The following is a suggested record for agreeing the trial with your supplier. The selected grade, component and customer requirements determine which stages and tests apply.
| Review stage | What to record |
|---|---|
| After printing | Material identification, colour, coverage, appearance and any visible defect. Retain a reference sample and clear photographs. |
| After intended production steps | The actual forming, heating, assembly or other relevant sequence, together with when and where a change first appears. |
| After specified conditioning and tests | The agreed method, sample construction, conditions, acceptance criteria and observed result for each required property. |
| Before the production order | The approved sample, complete system, trial record, permitted scope and any unresolved point requiring confirmation. |
Interstage drying and final conditioning before evaluation need separate instructions. The supplied TDS collection notes that a temperature without a duration is an incomplete drying schedule, and that a listed test condition alone does not establish a pass result.
Match the evidence to the production problem
For peeling or poor adhesion, show where the separation occurs and whether it appears before or after later processing. For cracking during flexing, include the print construction, conditioning history and required flex-test conditions.
For water-based ink print gaps or screen blocking, describe whether the defect appears during continuous printing or after a pause. For colour bleeding on shoe mesh, keep photographs from the relevant processing stages and identify the material colour and full layer sequence. These records help define the review; a photograph alone does not establish the cause.
Keep the sample decision separate from the production order
Agree what the sample approval covers and who will sign off the technical result. Keep the reference sample and trial record available when discussing the bulk order. If the material, ink grade, companion materials or process changes, check whether another trial is needed. Record any limits alongside the approval so they remain visible to the people placing and running the order.
Prepare a useful sample enquiry
To begin a confidential application review, send:
- The material, component and known surface finish.
- The printing or spraying route and current product names, if known.
- The production problem, when it appears and the result you need.
- Your required tests and acceptance criteria, with photographs or records you can share.
- The intended factory or distributor use, expected order needs and delivery city/PIN.
StrideChem’s manufacturing is in China. The factory team reviews the material and requirements to discuss a suitable existing product or a custom-development trial. Trial samples are free; the customer pays postage or courier charges. The grade, sample availability and dispatch arrangements are confirmed before shipping. If the material needs to be examined first, use the material assessment route to agree what to send.
Questions before approving footwear ink samples
Can one sample approval cover EVA, TPU and nylon?
Define approval for the actual material, surface finish, ink grade and process tested. The supplied documents list separate product routes for these materials. Discuss any extension to another component or material before treating it as approved.
Is a catalogue flex figure enough to approve the ink?
Confirm the test method, sample construction, conditions and acceptance criteria behind the figure. Where those details are missing, the reported number does not establish a comparable result for your finished component.
What if the hardener or final drying instructions are incomplete?
Ask for the complete instructions for the supplied grade, including the hardener identity, addition basis, mixed-product working time and final conditioning. Keep those items open in the trial record until confirmed.