Linear Preform Heating With Monochromatic Lasers for Lower Heat Dispersion
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Solution Overview
Problem
Existing preform heating systems in the packaging industry suffer from low energy efficiency and significant heat dispersion, leading to energy waste and non-homogeneous heating due to the use of tungsten lamps that emit a wide range of wavelengths not optimally absorbed by plastic materials, necessitating larger ovens and inefficient energy use.
Innovation Solution
A preform heating system using monochromatic laser sources that emit radiation at specific wavelengths absorbed by PET and other plastics, concentrating the radiation on the preform's cylindrical geometry to enhance absorption and minimize environmental heat dispersion, with a heating apparatus that synchronizes the movement of preforms and heating devices to optimize heating time and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If tungsten lamps are used for heating preforms, then the heating path can be extended to allow adequate heating time, but the energy efficiency deteriorates due to wide wavelength emission not optimally absorbed by plastic materials
Solution Approach 1:
The patent changes the wavelength parameter of the radiation source from broad-spectrum tungsten lamps to monochromatic laser sources with specific wavelengths (e.g., 1064nm, 1550nm, 1940nm) that match the absorption characteristics of plastic materials. This parameter change enables efficient energy absorption while maintaining adequate heating time through optimized exposure duration.
2Duration of action of moving object
If a long heating path is provided for adequate heating time, then the heating effectiveness is improved, but the device size deteriorates requiring larger ovens
Solution Approach 1:
The patent replaces the mechanical extension of the heating path with concentrated high-intensity monochromatic laser radiation. Instead of extending the physical heating path length, the system uses optimized laser parameters (power, wavelength, exposure time) to achieve adequate heating in a compact space, substituting mechanical dimension increase with optimized energy delivery.
3Illumination intensity
If tungsten lamps emit energy at different wavelengths, then the radiation covers a broad spectrum, but the energy absorption by preforms deteriorates with only small part effectively absorbed
Solution Approach 1:
The patent applies local quality by matching the radiation wavelength specifically to the absorption characteristics of the plastic material. Instead of using broad-spectrum radiation, monochromatic laser sources emit at specific wavelengths (e.g., 1064nm, 1550nm, 1940nm) that correspond to the molecular absorption bands of plastic polymers, ensuring localized optimal energy absorption where it is most needed.
4Device complexity
If conventional infrared lamps are used, then the heating system can be simple in structure, but the energy loss deteriorates with considerable dispersion into the environment
Solution Approach 1:
The patent replaces conventional infrared lamp heating with monochromatic laser radiation, substituting a system prone to thermal dispersion with one that delivers concentrated optical energy. The laser's coherent and directional properties enable precise energy delivery to the preform surface, dramatically reducing environmental heat loss while maintaining structural simplicity through direct radiation-heating coupling.
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
The system achieves higher energy efficiency by concentrating radiation on the preform, reducing heat loss, and optimizing heating uniformity, thereby minimizing energy waste and oven size while ensuring homogeneous heating.
Implementation Method 1
monochromatic laser sources which emit a monochromatic electromagnetic radiation in a convenient wavelength range and in accordance with the absorption spectrum of the plastic material
Implementation Method 2
heating system by means of infrared radiation generated by one or more monochromatic laser sources
Data Source
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AI summary
The present invention relates to a continuous or discontinuous linear system for heating the preforms upstream of a blowing or stretch- blowing machine, in particular a heating system by means of infrared radiation generated by one or more monochromatic laser sources (L1).In particular, the invention relates to a continuous or discontinuous apparatus (1, 501) of the linear type for heating preforms (P), comprising a plurality of heating devices configured so as to be arranged outside the preform and to radiate an electromagnetic radiation in the infrared range forming, in such a heating element, a radiation disk according to a radial symmetry with respect to the center of the preform axis.