Printed-Item Treatment Assembly With Fume Recirculation
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Solution Overview
Problem
Existing digital printing and screen printing systems face challenges in effectively abating solvents like aldehydes from glazes and inks, leading to pollution, and existing solvent recovery methods are costly and inefficient.
Innovation Solution
A system that recirculates volatile fumes from a drying unit into an oven or drying unit, using burners to abate aldehydes and recover energy, with a ventilation circuit to manage airflow and temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If post combustor burners are used to abate solvents downstream of the oven chimney, then solvent abatement is achieved, but installation cost and energy consumption increase significantly
Solution Approach 1:
The invention merges the solvent abatement function with the existing oven heating function by redirecting oven exhaust gases containing hot combustion air back into the oven chamber. This eliminates the need for separate post-combustor burners and their associated high energy consumption, while achieving effective solvent abatement through the recycled hot gases.
Solution Approach 2:
The system uses the oven's own exhaust gases to perform the abatement function, making the oven self-sufficient for solvent treatment. The hot combustion air generated by the oven's normal operation is recirculated back into the chamber, creating a self-contained abatement system without external energy input.
2Adaptability or versatility
If solvent based products are used in digital printing, then printing flexibility is maintained, but satisfactory printing results cannot be obtained
Solution Approach 1:
The invention changes the thermal parameters within the oven chamber by recirculating hot exhaust gases, creating optimized temperature profiles that enable satisfactory drying and curing results when using solvent-based digital printing products, thereby resolving the quality issue while maintaining printing flexibility.
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
Effectively abates aldehydes and recovers energy, providing a simple and efficient solution for solvent treatment in digital printing systems.
Implementation Method 1
a ventilation circuit (5) conveying the volatile fumes or currents within the oven (3) and/or in recirculation within the drying unit (2)
Implementation Method 2
using burners to abate aldehydes and recover energy
Implementation Method 3
using burners to abate aldehydes and recover energy
Implementation Method 4
abate aldehydes
Implementation Method 5
abate aldehydes
Data Source
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AI summary
The present invention relates to an assembly for treating items, such as tiles or slabs, printed by digital printing or screen printing of inks or glazes, comprising: - a drying unit (2) of the printed items; - a cooking unit or oven (3) of the printed and dried items, the cooking unit or oven (3) being located downstream of the drying unit (2) or being in any case adapted to receive and subsequently treat the items treated in the latter;