Low-Energy Injection-Molded Phonograph Records with Suppressed Crystallinity

Patent Title: Low-Energy Injection-Molded Phonograph Records with Suppressed Crystallinity

Application Number: PCT/US2026/001234

Inventors: Dr. Evelyn Chen, Dr. Marcus Thorne

01 // FIELD OF THE INVENTION

The present invention relates to phonograph record manufacturing and polymer processing, and more particularly to injection-molded audio records comprising recycled polyethylene terephthalate (r-PET) formulations that reduce energy consumption and environmental impact while maintaining high-fidelity acoustic performance through deliberate suppression of polymer crystallinity.

02 // BACKGROUND OF THE INVENTION

Prior Art and Technical Problem

2.1 Conventional Vinyl Record Manufacturing

Traditional vinyl record production relies on compression molding of polyvinyl chloride (PVC) compounds. Typical processes involve heating PVC pucks to approximately 180°C using steam from natural gas or heavy fuel oil boilers. This approach demands substantial capital investment in boiler systems and hydraulic press infrastructure.

Process energy consumption for conventional steam-pressed PVC records ranges from approximately 0.4 to 0.5 kWh per 140-gram 12-inch LP. Stamper longevity is limited to approximately 1,500 to 2,000 cycles due to mechanical wear.

2.2 Prior Art: PET-Based Injection-Molded Records

Developments by Sonopress GmbH (EcoRecord™, 2025) and Green Vinyl Records (2022) have demonstrated that injection-molded PET records can reduce manufacturing energy by up to 90%. Coldplay's album "Moon Music" (2024) was commercially released as a 140-gram EcoRecord LP produced from recycled PET bottles.

2.3 Limitations of Prior Art

PET's tendency toward semi-crystalline morphology during cooling presents a fundamental acoustic challenge: crystalline domains scatter acoustic energy and raise the high-frequency noise floor. Prior art PET record formulations have not systematically addressed crystallinity suppression as the primary design objective.

03 // SUMMARY OF THE INVENTION

The Crystallinity-Suppressed Composition

The invention provides a composition comprising r-PET matrix, a core-shell rubber (CSR) acoustic modifier, micronized PTFE as a tribological aid, and a specific exclusion of nucleating agents (< 0.01 wt%).

INGREDIENT	BROAD RANGE	PREFERRED	FUNCTION
r-PET (IV ≥ 0.80 dL/g)	90–99.5 wt%	97 wt%	Matrix material
Core-Shell Rubber	0.5–5 wt%	2 wt%	Acoustic modifier
PTFE (1–5 µm)	0.05–1 wt%	0.3 wt%	Tribological aid

Environmental Impact Dashboard

ENERGY SAVED

0 kWh

Per 1k units

CO₂ REDUCTION

0 kg

Cradle-to-gate

PET BOTTLES

Diverted from landfill

PRODUCTION RATE

0/h

Max capacity

05 // DETAILED DESCRIPTION — COMPOSITION

Material Logic

5.1 Matrix Polymer: Recycled PET

The matrix polymer is r-PET with IV of 0.80 to 0.90 dL/g. High IV is critical to ensure adequate melt strength at the elevated processing temperatures (250–290°C).

5.2 CSR Acoustic Modifier

CSR (0.5 to 5 wt%) disrupts crystallization kinetics and increases the material's loss tangent (tan δ) to match PVC damping characteristics.

5.6 Deliberate Exclusion of Nucleating Agents

Critical to the invention: Conventional PET routinely incorporates nucleating agents (sodium benzoate, talc) to accelerate cycle times. This invention deliberately excludes all nucleators to kinetically trap the polymer in an amorphous state.

06 // DETAILED DESCRIPTION — PROCESS

The Process Window

PARAMETER	RANGE	PREFERRED	FUNCTION
Melt Temperature	250–290°C	270°C	Viscosity control
Mold Temperature	80–110°C	95°C	Quench cooling
Cooling Time	15–25 seconds	20 seconds	Crystallinity control
Injection Pressure	80–120 MPa	100 MPa	Cavity fill

6.3 Thermodynamic Rationale

PET crystallization peaks at 160–180°C. The mold temperature of 80–110°C is selected to quench the melt rapidly through this window. Cooling < 15s induces thermal shock; > 25s allows cold crystallization.

08 // EXAMPLES

Working and Prophetic Data

WORKING EXAMPLE 1 — ACTUAL DATA

100 kg compound (97% r-PET, 2% CSR, 0.3% PTFE) processed on Leistritz twin-screw. Injection molded on 280-ton Engel press. Results: 0.145 kWh/disc. All units passed interferometric QA (RMS roughness 0.15–0.18 µm).

PROPHETIC EXAMPLE 2 — EXPECTED ACOUSTIC PERFORMANCE

METRIC	PVC CONTROL	INVENTIVE r-PET
Frequency Response	±1.4 dB	±1.5 dB
THD @ 1 kHz	0.42%	0.44%
SNR (A-weighted)	62 dB	61 dB

PROPHETIC EXAMPLE 3 — EXPECTED ENVIRONMENTAL IMPACT

PARAMETER	TRADITIONAL PVC	INVENTIVE r-PET	REDUCTION
Process Energy	0.48 kWh/unit	0.14 kWh/unit	70%
CO₂ (Cradle-to-Gate)	1.15 kg CO₂e	0.40 kg CO₂e	65%
Manufacturing Cost	$1.70/unit	$0.72/unit	58%

09 // COMPARATIVE EXAMPLE

COMPARATIVE EXAMPLE A — NUCLEATED PET (COUNTER-EXAMPLE)

Formulation identical to Example 1 but with 0.3 wt% sodium benzoate. Results: Haze and birefringence observed. RMS roughness 0.28–0.35 µm. Surface noise elevated. Nucleator exclusion is verified as essential.

REPRESENTATIVE CLAIMS

AL-26

[ CLAIM 1: COMPOSITION ]

90–99.5 wt% r-PET (IV ≥ 0.80); 0.5–5 wt% CSR; 0.05–1 wt% PTFE; NO NUCLEATORS (< 0.01 wt%).

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[ CLAIM 10: METHOD ]

Inject 250–290°C; Hold 60–80 MPa; Quench-cooling 15–25s @ 80–110°C.

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[ CLAIM 16: SYSTEM ]

100% inline interferometric inspection; auto-reject loop for R_q ≥ 0.20 µm.

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[ CLAIM 20: ARTICLE ]

Amorphous record; Groove depth 0.70 ± 0.03 µm; RMS roughness < 0.20 µm; Impedance 2.3–2.7x10⁶.

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INTERACTIVE CONTROLS

REFERENCES

[1] Green Vinyl Records (2022)
[2] Owsinski (2023) Handbook
[4] Sonopress EcoRecord (2025)
[5] VRMA Carbon Report (2024)
[7] Gao, W., et al. (2019) CIRP Annals

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Jun 10

DOCKET NO: AL-2026-001 CONFIDENTIAL

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