← EXPLODED VIEWL04
MATERIAL-LAYER TECHNICAL DOSSIER
Microcellular PHBH Membrane
A fine-cell structure combines surface compliance, insulation and microtexture.
PRE-INDUSTRIAL R2COMPRESSIBLE GRIP MEMBRANE
01 · PRINCIPLE & RATIONALE
Intended function
and associated requirement.
A fine-cell structure combines surface compliance, insulation and microtexture.
The hand gains grip and comfort without an elastomer insert from another material family.
Apparent density, cell distribution, surface skin, tear resistance and adhesion jointly determine touch, drainage and durability.
02 · TECHNOLOGY STACK
Technologies, roles
and approval gates.
Material and process qualification
- Role
- Converts the design basis into a repeatable specification.
- Why
- Performance depends on the real commercial grade and process window.
- Approval gate
- Documented test evidence and approved specification.
03 · ARCHITECTURE
Function, material
and interfaces.
The membrane must compress beneath the fingers and recover without delamination or trapped water.
- Air pocket L03
- Topcoat L05
- Body seal
- Skin and condensation
- 01Target 0.30 mm thickness
- 02Target cells <30 µm
- 03Continuous skin
- 04Integrated drainage
04 · MASTER PARAMETER REGISTER
Everything to be defined,
measured or certified.
A field without evidence is never filled with an invented number: it remains “To be determined”, together with the method required to close it. This is what makes the technical record verifiable.
DESIGN BASISTARGETCALCULATED / MEASUREDTO BE VALIDATEDCERTIFICATION REQUIRED
01Identification & function1 PARAMETERS
| ID | Parameter | Symbol | Value | Unit | Tolerance | Condition | Method | Status |
|---|---|---|---|---|---|---|---|---|
| L04-X001 | Intended use | USE | To be determined | — | To be defined | Full use cycle | Design review + user study | TO BE VALIDATED |
02Geometry & metrology1 PARAMETERS
| ID | Parameter | Symbol | Value | Unit | Tolerance | Condition | Method | Status |
|---|---|---|---|---|---|---|---|---|
| L04-X002 | Nominal mass | m | To be determined | g | To be defined | 23 °C / 50% RH | Balance 0.001 g | TO BE VALIDATED |
03Material1 PARAMETERS
| ID | Parameter | Symbol | Value | Unit | Tolerance | Condition | Method | Status |
|---|---|---|---|---|---|---|---|---|
| L04-X003 | Commercial grade and supplier | GRADE | To be determined | — | Qualified grade | Production lot | CoA + traceability | TO BE VALIDATED |
04Thermal properties1 PARAMETERS
| ID | Parameter | Symbol | Value | Unit | Tolerance | Condition | Method | Status |
|---|---|---|---|---|---|---|---|---|
| L04-X004 | Service-temperature range | Tservice | To be determined | °C | To be defined | Use and transport | Climate chamber | TO BE VALIDATED |
05Mechanical properties1 PARAMETERS
| ID | Parameter | Symbol | Value | Unit | Tolerance | Condition | Method | Status |
|---|---|---|---|---|---|---|---|---|
| L04-X005 | Drop resistance | Hdrop | To be determined | m | To be defined | Defined orientations | Instrumented drop test | TO BE VALIDATED |
06Quality control1 PARAMETERS
| ID | Parameter | Symbol | Value | Unit | Tolerance | Condition | Method | Status |
|---|---|---|---|---|---|---|---|---|
| L04-X006 | Process capability | Cpk | To be determined | — | Target to be defined | Critical CTQ | SPC ≥30 samples | TO BE VALIDATED |
07Food contact1 PARAMETERS
| ID | Parameter | Symbol | Value | Unit | Tolerance | Condition | Method | Status |
|---|---|---|---|---|---|---|---|---|
| L04-X007 | Overall and specific migration | MIG | To be determined | mg/kg | Applicable limits | Simulant/time/temperature | Accredited methods | TO BE VALIDATED |
08Recyclability1 PARAMETERS
| ID | Parameter | Symbol | Value | Unit | Tolerance | Condition | Method | Status |
|---|---|---|---|---|---|---|---|---|
| L04-X008 | Territory-specific end-of-life route | EOL | To be determined | — | Country/area defined | Complete assembly | Infrastructure mapping | TO BE VALIDATED |
05 · INDUSTRIALISATION
From material
to final inspection.
Qualified material
Microcellular PHBH; target cells <30 µm
Process within window
Film extrusion/forming + microcellular processing
Controlled interfaces
Air pocket L03 · Topcoat L05 · Body seal · Skin and condensation
CTQ + traceability
Expansion, thickness, uniformity and sealability must be controlled before assembly.
06 · DVP&R
A function is approved
only after passing its test.
| Test | Requirement | Risk | Method | Condition | Samples | Acceptance | Output |
|---|---|---|---|---|---|---|---|
| DVP-05 | Condensation management | Wet grip | Climate + gravimetry | 25 °C/60% RH; water 4 °C | 30 | ≥60% less retained water | Mass + images |
| DVP-06 | ThermoSnow | Incorrect threshold | Thermal/colour cycles | 0–25 °C | 30 | 8±2 °C; ≤15 s | ΔE/T curves |
| DVP-12 | Food contact | Migration/NIAS | Overall/specific migration | Cold-fill water use | 3 lots | Applicable regulatory compliance | Signed report |
07 · FAILURE MODES
Failure modes,
causes and controls.
Body brittleness
EffectBreakage/leak
CausePHA thermal window
ControlDSC/TGA, rheology, process DOE
Non-uniform walls
EffectBuckling/drop failure
CauseAsymmetric geometry
ControlBlow-moulding CAE + micro-CT
AeroSkin detachment
EffectLoss of function/loose part
CauseInsufficient seal
ControlPeel, thermal cycling and drop
08 · EVIDENCE POLICY
Traceability
for every parameter.
It remains within the candidate PHA family, but the expanded structure requires end-of-life validation.
This page is the technical register for the R2 configuration. It separates design values, targets, calculations, measurements and certifications. Open fields identify the exact test or document required to close them.