Technical Insight
How TPU Hardness and Grade Affect Laser-Mark Contrast
Panduan rekayasa ini membahas How TPU Hardness and Grade Affect Laser-Mark Contrast, termasuk batas proses, bukti validasi, dan kebutuhan kualifikasinya.
Author: Aurexene Materials Engineering Team · Last updated: 2026-08-28
Jawaban singkat
Treat hardness as a formulation descriptor, not a laser-response predictor; compare actual TPU grades because chemistry, additives, pigment and moisture can move contrast independently of Shore value.
Evidence scope: This page provides method-conditioned engineering guidance. It does not claim that one commercial grade is a drop-in replacement, universally superior, or qualified for a finished part without matched evidence.
Problem
Treat hardness as a formulation descriptor, not a laser-response predictor; compare actual TPU grades because chemistry, additives, pigment and moisture can move contrast independently of Shore value.
The decision boundary includes the complete host formulation, colour package, supplied additive form, compounding and moulding history, part geometry, delivered laser state and the measurement method. A result is not transferable when one of those conditions changes without review.
Mekanisme
Hardness changes often accompany changes in soft and hard segment balance, plasticization, crystallinity or fillers, which alter heat flow and the damage threshold.
Laser marking is a coupled material-and-process response. Absorption and scattering determine where energy is deposited; pulse state, focus, overlap and path determine the local history; the polymer, pigments, fillers and geometry determine whether that history creates controlled contrast or a defect.
Tradeoff
A harder grade may hold a sharper feature yet require more energy, while a softer grade may mark readily but show melt relief or distortion.
The useful condition is a feasible region with margin, not the single darkest coupon. Contrast, edge, surface integrity, unmarked colour, processing, mechanical function, durability and cycle time must be evaluated together.
Material Strategy
Use BCHP and ATO as application-specific screening candidates. The list is not a performance ranking and does not establish equivalence between chemistry families.
- Freeze the host grade, colour, thickness, geometry and acceptance criteria.
- Normalize active-content and supplied-form differences or explain why another comparison basis is used.
- Screen loading and laser variables in a bounded matrix and preserve failed runs.
- Confirm the selected window across relevant lots, parts, tools and exposures.
Recommended Architectures
| Architecture | Use when | First validation gate |
|---|---|---|
| Matched baseline | The current material, colour and laser recipe require a reproducible reference. | Grade-and-hardness response matrix |
| Bounded screening ladder | Loading, supplied form, colour or delivered laser variables must be separated. | grade identity; Shore scale and method; moisture conditioning; thermal history; contrast and deformation |
| Production confirmation | A candidate window must transfer across lots, geometry, tools or lifecycle exposures. | Margin, repeatability, failures and requalification triggers |
Controls That Must Stay Visible
| Order | Kontrol | Review rule |
|---|---|---|
| 1 | grade identity | Hold the other declared formulation, process, geometry and measurement conditions constant before attributing an effect. |
| 2 | Shore scale and method | Hold the other declared formulation, process, geometry and measurement conditions constant before attributing an effect. |
| 3 | moisture conditioning | Hold the other declared formulation, process, geometry and measurement conditions constant before attributing an effect. |
| 4 | thermal history | Hold the other declared formulation, process, geometry and measurement conditions constant before attributing an effect. |
| 5 | contrast and deformation | Hold the other declared formulation, process, geometry and measurement conditions constant before attributing an effect. |
Measurement & Validation
Primary response: Grade-and-hardness response matrix.
Method: Condition and mould each declared grade consistently; record Shore method, unmarked colour, contrast, relief, damage and retained flex performance.
Report the unit or grade together with instrument or verifier geometry, specimen state, conditioning, repeats, distribution or uncertainty, failures and the acceptance limit. A scanner pass, photograph or supplier representative value is not a substitute for the declared method.
Qualification Boundary
- Record exact material and lot identities, active-content basis, carrier and colour package.
- Record compounding, drying, moulding, thickness, surface and geometry.
- Record source wavelength, pulse state, spot or focus, speed, hatch, passes, field and calibration.
- Measure marked and unmarked controls using the declared method.
- Confirm production and lifecycle variation, then define requalification triggers.
Primary Sources and Standards Boundary
- Commission Implementing Regulation (EU) 2021/520 — Defines visible, legible, indelible and lifetime-readability requirements for covered animal-identification means; it does not validate a polymer or additive grade.
- ICAR identification-device certification procedures — Defines device-level laboratory and certification test areas for conventional and electronic ear tags.
- ICAR Appendix B5: Laboratory Test for Conventional Plastic Ear Tags — Provides the current conventional-tag test procedure, including readability, colour contrast, artificial ageing, abrasion and optional machine-readability checks.
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