How should matcha product packaging be designed to prevent oxidation?

Oxygen Barrier Layer: Utilize multi-layer composite materials such as aluminum foil (AL), metallized polyethylene terephthalate (PET), or ethylene vinyl alcohol (EVOH). These materials effectively block oxygen permeation (oxygen transmission rate should be below 0.5 cc/m²/day).
Light-Blocking Design: Opt for opaque or dark-colored materials (e.g., black or dark green) to minimize light exposure and prevent photo-induced oxidation.
Moisture Barrier Layer: Incorporate polyethylene (PE) or polypropylene (PP) layers to prevent moisture ingress and avoid accelerated oxidation caused by humidity.

Sealing Method: Adopt vacuum sealing or nitrogen flushing (injecting nitrogen during filling to displace oxygen), ensuring residual oxygen levels remain below 1%. Use heat-sealing technology or tear-notched seals to guarantee complete airtightness before initial opening.
Packaging Format: Prioritize small-capacity single-use packaging (e.g., 1-5g sachets) to reduce air exposure. For larger packages, include re-sealable zippers or screw caps to allow quick closure after use.
Shape Design: Choose flat or compact structures (e.g., stand-up pouches or canisters) to minimize internal air space and prevent oxygen accumulation.

Oxygen Absorbers or Antioxidants: Place food-grade oxygen absorbers (e.g., iron-based sachets) inside packaging to actively absorb residual oxygen and extend shelf life.
Inert Gas Flushing: Fill packaging with nitrogen or carbon dioxide during processing to create a low-oxygen environment.

Testing and Certification: Conduct accelerated oxidation tests (e.g., under 40°C/75% RH conditions) to ensure packaging effectively prevents oxidation throughout the shelf life (typically 6-12 months). Comply with food safety standards (e.g., FDA or Chinese GB standards).
User-Friendliness: Balance aesthetics (e.g., matcha-themed prints) and sustainability (e.g., recyclable materials), but prioritize functionality. Avoid designs like transparent windows that increase oxidation risk.
Storage Recommendations: Include "Store in a cool, dry place away from light" on labels to guide proper consumer storage.