COMPONENT TECHNICAL DOSSIER

ThermoSnow Indicator

The snowflake does not display a numerical temperature; it makes the wall’s transition through a designed cold range visible.

PRE-INDUSTRIAL R2PASSIVE TEMPERATURE SIGNAL

Technical study of the ThermoSnow system integrated into AQUENORA — P03 · REFERENCE CONFIGURATION

23registered technical fields

10engineering disciplines

4basis / calculated / measured

8targets to be demonstrated

11fields requiring evidence

01 · PRINCIPLE & RATIONALE

Intended function
and associated requirement.

PRINCIPLE

The snowflake does not display a numerical temperature; it makes the wall’s transition through a designed cold range visible.

WHY IT IS INCLUDED

At a glance, the user can recognise when the bottle is within the intended cool range—without a battery, app or display.

DETAILED DESCRIPTION

Makes the intended cold range visible through a passive, reversible thermochromic snowflake. Reversible thermochromic microcapsules operate in a local layer protected by PHBH film. A thin thermal bridge reduces lag between water, wall and indicator. 8 ± 2 °C and ≤15 s are targets to be calibrated on the real wall; the symbol does not certify potability or the exact temperature of the full volume.

02 · TECHNOLOGY STACK

Technologies, roles
and approval gates.

T-01

Reversible thermochromic microcapsules

Role: Change contrast across the designed temperature band.
Why: Communicate cold without a battery, display or app.
Approval gate: ΔE/T curve, hysteresis and 200 cycles.

T-02

Local thermal bridge

Role: Reduces lag between water, wall and patch.
Why: Prevents the symbol reacting too late.
Approval gate: Transient model plus thermocouples.

T-03

PHBH cover film

Role: Contains and protects the active layer.
Why: Keeps microcapsules isolated in use and transport.
Approval gate: Peel, haze, migration and NIAS.

03 · ARCHITECTURE

Function, material
and interfaces.

Reversible thermochromic microcapsules operate in a local layer protected by PHBH film. A thin thermal bridge reduces lag between water, wall and indicator.

MATERIALThermochromic microcapsules + PHBH cover film

CANDIDATE PROCESSPrinting/deposition + encapsulation + sealing

INTERFACES

Protected external recess
body thermal bridge

FUNCTIONAL ARCHITECTURE

01Protected external patch
02Target 0.35 mm local thermal bridge
0320–40 µm active layer
04Non-electronic colour reading

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 & function3 PARAMETERS

ID	Parameter	Symbol	Value	Unit	Tolerance	Condition	Method	Status
P03-001	Assembly code	ID	P03	—	To be defined	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	DESIGN BASIS
P03-002	Designation	NAME	ThermoSnow	—	To be defined	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	DESIGN BASIS
P03-X001	Intended use	USE	To be determined	—	To be defined	Full use cycle	Design review + user study	TO BE VALIDATED

02Risk & maturity2 PARAMETERS

ID	Parameter	Symbol	Value	Unit	Tolerance	Condition	Method	Status
P03-003	Architecture revision	REV	R2	—	To be defined	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	DESIGN BASIS
P03-004	Technology readiness	TRL	2–3	level	To be defined	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	TO BE VALIDATED

03Food contact3 PARAMETERS

ID	Parameter	Symbol	Value	Unit	Tolerance	Condition	Method	Status
P03-005	Declaration of Compliance	DoC	required	document	To be defined	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	CERTIFICATION REQUIRED
P03-014	Intelligent-system migration	MIG	compliant	—	EC 450/2009	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	CERTIFICATION REQUIRED
P03-X007	Overall and specific migration	MIG	To be determined	mg/kg	Applicable limits	Simulant/time/temperature	Accredited methods	TO BE VALIDATED

04Quality control3 PARAMETERS

ID	Parameter	Symbol	Value	Unit	Tolerance	Condition	Method	Status
P03-006	Lot traceability	LOT	100	%	To be defined	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	TARGET
P03-015	End-of-line colour state	VISION	100	%	To be defined	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	TARGET
P03-X006	Process capability	Cpk	To be determined	—	Target to be defined	Critical CTQ	SPC ≥30 samples	TO BE VALIDATED

05Geometry & metrology5 PARAMETERS

ID	Parameter	Symbol	Value	Unit	Tolerance	Condition	Method	Status
P03-007	Active symbol diameter	Dact	10	mm	To be defined	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	DESIGN BASIS
P03-008	Recess diameter	Drec	14	mm	To be defined	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	TARGET
P03-009	Local thermal bridge	tbridge	0.35	mm	To be defined	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	TARGET
P03-010	Microcapsule layer	tTC	20–40	µm	To be defined	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	TARGET
P03-X002	Nominal mass	m	To be determined	g	To be defined	23 °C / 50% RH	Balance 0.001 g	TO BE VALIDATED

06Thermal properties3 PARAMETERS

ID	Parameter	Symbol	Value	Unit	Tolerance	Condition	Method	Status
P03-011	Transition threshold	Tswitch	8 ± 2	°C	To be defined	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	TARGET
P03-012	Response time	tresp	≤15	s	After wall stabilisation	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	TARGET
P03-X004	Service-temperature range	Tservice	To be determined	°C	To be defined	Use and transport	Climate chamber	TO BE VALIDATED

07Durability & reliability1 PARAMETERS

ID	Parameter	Symbol	Value	Unit	Tolerance	Condition	Method	Status
P03-013	Colour endurance	Ncycle	200	cycles	To be defined	23 °C / 50% RH unless noted	CAD, CAE or dedicated test	TARGET

08Material1 PARAMETERS

ID	Parameter	Symbol	Value	Unit	Tolerance	Condition	Method	Status
P03-X003	Commercial grade and supplier	GRADE	To be determined	—	Qualified grade	Production lot	CoA + traceability	TO BE VALIDATED

09Mechanical properties1 PARAMETERS

ID	Parameter	Symbol	Value	Unit	Tolerance	Condition	Method	Status
P03-X005	Drop resistance	Hdrop	To be determined	m	To be defined	Defined orientations	Instrumented drop test	TO BE VALIDATED

10Recyclability1 PARAMETERS

ID	Parameter	Symbol	Value	Unit	Tolerance	Condition	Method	Status
P03-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.

INPUT

Qualified material

Thermochromic microcapsules + PHBH cover film

FORMING

Process within window

Printing/deposition + encapsulation + sealing

INTEGRATION

Controlled interfaces

Protected external recess · body thermal bridge

RELEASE

CTQ + traceability

Deposition or printing, encapsulation and sealing must ensure position, thickness and 100% end-of-line colour inspection.

06 · DVP&R

A function is approved
only after passing its test.

Test	Requirement	Risk	Method	Condition	Samples	Acceptance	Output
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.

R-01

Body brittleness

EffectBreakage/leak

CausePHA thermal window

ControlDSC/TGA, rheology, process DOE

R-02

Non-uniform walls

EffectBuckling/drop failure

CauseAsymmetric geometry

ControlBlow-moulding CAE + micro-CT

R-03

AeroSkin detachment

EffectLoss of function/loose part

CauseInsufficient seal

ControlPeel, thermal cycling and drop

08 · EVIDENCE POLICY

Traceability
for every parameter.

The absence of electronics removes batteries and circuitry. The active system is still an additive material, so its mass, migration and end-of-life behaviour must be qualified.

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.

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