Microwave Heating for Glass Container Production Lines
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Solution Overview
Problem
Existing glass container production methods using open flames for heating are environmentally harmful, inefficient, and lack precise temperature control, leading to poor quality and high production costs.
Innovation Solution
A microwave heating source is used as the sole heating method, with adjustable power settings to modulate energy delivery, allowing rapid and precise heating of glass containers in a high-speed production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If open flame heating is used, then glass can be heated to working temperature, but environmental impact increases and energy efficiency decreases
Solution Approach 1:
The patent replaces the mechanical/chemical combustion system (open flame using methane and oxygen) with an electromagnetic field-based heating system (microwave radiation). This substitution eliminates the need for fuel combustion, thereby reducing environmental impact and improving energy efficiency by directly coupling energy to the glass material through dielectric heating mechanisms.
Solution Approach 2:
The patent changes the fundamental heating parameter from thermal conduction via flame to electromagnetic radiation absorption. By utilizing the dielectric properties of glass at microwave frequencies, the system achieves more efficient energy transfer with reduced heat loss to the surrounding environment, directly addressing the energy efficiency problem.
2Temperature
If open flame heating is used, then glass can be heated, but process control precision deteriorates
Solution Approach 1:
The patent implements a feedback control system that monitors the glass heating process in real-time and adjusts microwave power delivery accordingly. This allows precise control of temperature profiles, eliminating the reliance on worker experience and environmental conditions that plagues open flame heating, and enables repeatable, high-precision processing.
Solution Approach 2:
By replacing the manual adjustment mechanism of open flame heating with an automated microwave control system, the patent achieves superior temperature control precision. The electromagnetic field can be modulated rapidly and precisely, allowing for better process control compared to the slow, experience-based adjustment of flame parameters.
3Temperature
If open flame heating is used, then glass can be heated to high temperature, but glass quality deteriorates due to violent alkaline releases
Solution Approach 1:
The patent replaces high-temperature combustion heating with moderate-temperature microwave dielectric heating. This substitution eliminates the extremely high flame temperatures (above 3000K) that cause violent alkaline releases from the glass, while still achieving the necessary working temperatures for glass processing through more controlled and gentle heating.
Solution Approach 2:
The patent fundamentally changes the heating parameter from extreme thermal energy (open flame) to controlled electromagnetic energy absorption. This parameter change allows heating to effective working temperatures without the excessive thermal energy that causes glass degradation and alkaline emissions, thereby improving product quality and reducing harmful emissions.
4Productivity
If microwave heating with constant high power is used, then heating speed increases, but localized overheating occurs
Solution Approach 1:
The patent employs periodic or pulsed microwave delivery rather than continuous constant power heating. By modulating the microwave power in time-varying patterns, the system achieves rapid overall heating while allowing heat diffusion to equalize temperatures between pulses, thereby preventing localized overheating and maintaining uniform temperature distribution.
Solution Approach 2:
The patent applies microwave energy in controlled portions rather than continuous excessive power. By delivering high power intermittently and allowing cooling periods, the system achieves the necessary heating speed for productivity while preventing the accumulation of excessive heat in localized regions, thus maintaining manufacturing precision.
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
This approach enables efficient, precise, and cost-effective heating of glass containers, overcoming the limitations of open flames and other multi-source heating methods, facilitating high-speed production with controlled temperature transitions.
Implementation Method 1
a microwave source, adjustable in power, to heat the glass container
Data Source
Figure 1
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Figure 4~5
AI summary
The invention relates to a glass container (10) production line (100) comprising: N workstations (110) configured to perform respective production steps on glass containers (10) being processed along the line (100), wherein N is an integer at least equal to 1; M heating devices (120) associated with at least a part of the N workstations (110) to heat portions of the glass containers (10) being processed, wherein M is an integer at least equal to 1. The M heating devices (120) respectively comprise M microwave sources (121) and M adjustment units (122) operatively associated with the M microwave sources (121), each of the M adjustment units (122) being configured to adjust in power the respective microwave source (121). The M microwave sources are microwave generators of the solid-state type. The M adjustment units are configured to adjust a power of the respective M microwave sources with an adjustment time of less than 100 ms.