Bread Conditioning Appliance Using Sequential Steam and Dry Heat
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Solution Overview
Problem
Bread freshness is difficult to maintain as it loses moisture and changes texture when reheated, with existing methods often resulting in uneven, dry, or burnt outcomes, especially for frozen bread.
Innovation Solution
A two-step process involving steam and dry heat, where steam initially hydrates and heats the bread, followed by dry heat to remove excess moisture and achieve a crispy crust, implemented in a compact appliance with programmable controls for varying bread types and conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If bread is reheated using conventional methods, then the bread is warmed, but moisture is lost and texture deteriorates
Solution Approach 1:
The heating process is divided into distinct stages: a steaming stage followed by a toasting stage. During the steaming stage, steam is introduced to the chamber to rehydrate the bread without direct contact water, preventing sogginess. The subsequent toasting stage then restores crust crispness. This segmentation allows independent optimization of moisture recovery and texture restoration.
Solution Approach 2:
Steam acts as an intermediary medium to transfer moisture and heat to the bread simultaneously. The steam generation system introduces vapor into the chamber atmosphere, allowing uniform moisture distribution throughout the bread without direct water application. This intermediary approach prevents localized water pooling while ensuring comprehensive rehydration.
2Temperature
If frozen bread is reheated, then the bread is warmed, but it becomes uneven, dry, or burnt
Solution Approach 1:
The steaming stage serves as a preliminary action that pre-hydrates and pre-heats the frozen bread before the toasting stage. By introducing steam first, the bread surface and interior are uniformly moistened and warmed, creating a consistent starting condition for subsequent toasting. This preliminary moisture distribution prevents dry spots and ensures even heat penetration during the second stage.
Solution Approach 2:
The system dynamically changes operational parameters between stages: steam generation is activated during the first stage and deactivated during the second stage, while heating continues throughout. This parameter switching allows the bread to transition from a rehydration state to a crisping state, achieving uniform results for frozen products without burning or dryness.
3Speed
If microwave heating is used on bread, then rapid heating is achieved, but elasticity and internal moisture are permanently degraded
Solution Approach 1:
The invention replaces microwave electromagnetic heating with thermal convection and phase-change heating using steam. Instead of using high-frequency electromagnetic waves that rapidly heat water molecules causing structural damage, the system uses steam condensation and convective heat transfer that gently warm and rehydrate the bread, preserving its cellular structure and elasticity while still achieving relatively fast heating.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Recreates the properties of freshly baked bread by maintaining internal moisture and achieving the right crust texture and crispness, effectively revitalizing both stale and frozen bread.
Implementation Method 1
a steam generator configured to generate steam for the chamber
Implementation Method 2
the steam provides both heat and moisture that can permeate into the bread
Implementation Method 3
at least one heating element configured to provide dry heat to the chamber and the food therein through at least one of radiation and convection
Implementation Method 4
at least one heating element configured to provide dry heat to the chamber and the food therein through at least one of radiation and convection
Implementation Method 5
a fan to assist the movement of steam and/or dry air in the chamber
Data Source
AI summary
In some embodiments, a food conditioning apparatus is provided and comprises a heating chamber configured to receive food, a steam generator configured to generate steam for the chamber, at least one heating element configured to provide dry heat to the chamber and the food therein through at least one of radiation and convection, and a control system configured to automatically operate a sequence of at least two stages. At least one stage comprises the generating for the chamber during a first duration, and at least one other stage comprises providing dry heat to the chamber for a second duration.