Sealed Inner Container for Food Heat-Preservation Boxes and Knapsacks

The problem

In commercial food logistics and military field operations, keeping food hot during transport is challenging. Standard insulated containers often suffer from poor sealing integrity. When hot food is placed in a container and immediately closed, the steam creates internal pressure. This pressure can cause lids to warp, pop open, or leak heat, compromising the temperature control. Furthermore, traditional handles on hot containers can become too warm to touch safely, requiring additional tools like mitts or tongs. There is also a lack of standardized methods for quickly removing individual serving trays from larger, multi-compartment insulated boxes or backpacks without disturbing adjacent compartments or risking burns.

The solution

1. The inner container consists of a serving tray body (41) with an open end featuring an outwardly extending expansion portion (411).
2. The serving tray cover (42) has an outer edge (421) that rests on this expansion portion, creating a lap joint.
3. A vertical wall (422) descends from the outer edge into the tray, with a sealing ring positioned between the wall and the tray body to form a closed space.
4. The center of the cover features a protruding part (424) that houses a handle (426) and a vent valve (43).
5. The vent valve allows air to escape as the lid is pressed down, equalizing pressure before the seal locks.
6. Lifting straps (45) are attached to the opposite edges of the tray’s expansion portion, allowing the user to pull the entire tray out of an insulated unit.

Who it is for

• Catering and Logistics Companies: Brands needing reliable, stackable containers for transporting large volumes of hot meals where pressure buildup is a common failure point.
• Military and Emergency Response Suppliers: Organizations requiring rugged, portable food systems (like the patented knapsack variant) that allow quick deployment of individual rations.
• Outdoor Gear Manufacturers: Companies producing insulated backpacks or coolers who want to integrate modular, removable hot-food compartments rather than just cold storage.
• Commercial Kitchen Equipment Makers: Manufacturers of bulk food warming cabinets that need standardized, easy-to-clean inner vessels with secure lids.

How it works

The main parts

Operating steps

1. Fill the Tray: Place hot food into the serving tray body (41).
2. Prepare the Lid: Open the vent valve (43) on the cover (42).
3. Close the Lid: Align the vertical wall (422) with the tray interior and press the outer edge (421) onto the expansion portion (411).
4. Equalize Pressure: As the lid seats, air escapes through the open valve (43).
5. Seal: Once fully seated, close the vent valve (43) and engage the fixing buckle (44) if applicable.
6. Transport/Extract: Use the lifting straps (45) to remove the entire container from an insulated box or knapsack.

Applications

Catering Delivery Services

High-volume meal prep facilities use these containers to transport trays of cooked dishes. The vent valve prevents lids from bulging during long drives, maintaining food safety standards and presentation quality upon arrival.

Field Ration Distribution

For emergency response teams or military units, the container fits into the patented “heat-preservation storage and transportation knapsack.” It allows soldiers or aid workers to carry individual hot meals securely, accessing them via the lifting straps without unpacking the entire kit.

Outdoor Camping Groups

Campers using insulated backpacks can pack separate hot food containers alongside cold drinks. The robust seal keeps soups or stews warm for hours, while the handle design makes it easy to serve food directly from the container around a campfire.

Institutional Cafeterias

Schools and hospitals benefit from the stackable design. The protruding handle sits lower than the rim, allowing multiple full containers to be stacked vertically in warming carts or shelves without wobbling or damaging the lids.

Where it is less suitable

• Cold Chain Only: While insulated, the specific focus on venting hot air pressure makes it optimized for hot foods; standard cold packs may not require the complex valve mechanism.
• Single-Serve Micro Portions: The structural complexity of the handle and valve is likely over-engineered for very small, disposable single-serving cups.
• Non-Food Chemical Storage: The materials and seal types described are tailored for food compatibility and thermal management, not necessarily for aggressive chemical resistance.