Dual-Layer Food Wrap for Heat Retention Without Aluminum Contact

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Solution Overview

Problem

Existing food containers made of aluminum foil pose health risks due to direct contact with food, and parchment paper alternatives do not provide adequate heat retention and sealing.

Innovation Solution

A dual-layered food container design featuring an outer bag with aluminum foil and parchment paper layers, where the parchment paper prevents direct contact with food and is secured with a food-grade adhesive, allowing for heat retention and sealing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If aluminum foil is used for food containers, then heat retention and sealing are improved, but health risks increase due to direct contact with food

Engineering Contradiction:

Improveheat retentionVSAvoidhealth risks from aluminum contact

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

A parchment paper liner is introduced as an intermediary layer between the aluminum foil container and the food. This mediator allows the container to retain the heat retention and sealing properties of aluminum foil while preventing direct contact between the food and aluminum, thereby eliminating health risks associated with aluminum exposure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The food container system combines two different materials: aluminum foil for structural integrity and heat retention, and parchment paper for food safety and non-stick properties. This composite approach allows each material to perform its optimal function without the drawbacks of either material alone.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If parchment paper is used for food containers, then health safety is improved by preventing aluminum contact, but heat retention and sealing capabilities deteriorate

Engineering Contradiction:

Improvehealth safetyVSAvoidheat retention

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The invention merges the advantages of both aluminum foil and parchment paper into a single container system. The aluminum foil outer layer provides superior heat retention and sealing, while the parchment paper inner layer ensures health safety. Together, they create a container that outperforms either material used alone.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If dual-layered design with adhesive is used, then food freshness and health safety are maintained, but device complexity increases

Engineering Contradiction:

Improvefood freshness maintenanceVSAvoidcontainer structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The parchment paper liner is pre-attached to the aluminum foil container using food-safe adhesive during manufacturing. This preliminary action eliminates the need for consumers to assemble or attach separate components, reducing usage complexity while maintaining the reliability benefits of the dual-layered design for food freshness and safety.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12577024B2Dual-layered food container

Publication Date: 2026.03.17 KRISPIN ZENA

AI summary

A dual-layered food container including a layer of parchment paper and a layer of aluminum foil. The parchment paper is on one surface of the wrap, while the aluminum foil is on the opposite surface. This arrangement prevents the aluminum foil from directly contacting the food, thereby avoiding potential health risks associated with aluminum. The wrap can take various forms such as a pocket, bag or sheet, and can be particularly useful for triangularly shaped food items like pizza slices.