Rotating Drum Coating Device Infrared Drying
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Solution Overview
Problem
The existing methods for coating small parts in coating drums face challenges such as uneven coating, solvent inclusion, and slow drying, which lead to increased production costs and limitations in the selection of coating materials due to the use of warm air drying, which can cause 'boilers' and disturb the coating jet.
Innovation Solution
A device and method using a rotating drum with a spray device for coating and a drying device employing electromagnetic radiation, such as infrared or ultraviolet, to dry and harden the coating material, allowing for targeted and efficient drying, and optionally incorporating a separate cooling system to prevent overheating and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If warm air drying is used in a rotating coating drum, then the coating can be dried, but the drying process is slow and causes solvent inclusion and boilers
Solution Approach 1:
The patent replaces the mechanical warm air drying system with an electromagnetic radiation drying system (infrared or microwave). This substitution allows for rapid, uniform heating of the coating without the convective airflow that causes solvent trapping and boilers, thereby resolving the contradiction between maintaining controlled temperature and achieving high drying speed.
Solution Approach 2:
The patent changes the drying mechanism from thermal convection (warm air) to electromagnetic radiation (infrared/microwave). This parameter change enables the coating to be heated directly and uniformly from within, achieving fast drying without the gradual surface-to-core heating that causes solvent inclusion and boilers in conventional warm air drying.
2Productivity
If warm air stream is used for drying, then the coating can be dried, but the coating jet is disturbed and homogeneous application is prevented
Solution Approach 1:
The patent replaces the mechanical warm air stream with electromagnetic radiation (infrared or microwave) for drying. This eliminates the convective airflow that disturbs the coating jet, allowing the spray application to remain undisturbed while achieving effective drying through direct electromagnetic heating of the coating material.
3Temperature
If warm air drying is used in a rotating drum, then the coating can be dried, but the process time is up to three hours which is too long
Solution Approach 1:
The patent replaces the slow thermal convection drying process with rapid electromagnetic radiation drying (infrared or microwave). This substitution reduces the drying time from hours to minutes by enabling direct, rapid heating of the coating material without relying on slow heat transfer through warm air circulation.
Solution Approach 2:
The patent fundamentally changes the drying parameter from thermal convection to electromagnetic radiation, enabling the coating to absorb energy directly and dry rapidly. This parameter change reduces the process time from up to three hours to a fraction of that time, resolving the time loss contradiction.
4Adaptability or versatility
If conventional warm air drying is used, then the coating can be dried, but the selection of coating material is restricted to those with very good drying properties
Solution Approach 1:
The patent replaces warm air drying with electromagnetic radiation drying (infrared or microwave), which heats the coating material directly rather than relying on convective heat transfer. This enables the use of a broader range of coating materials, including those with slower natural drying properties, as the electromagnetic radiation provides rapid, controlled heating that overcomes their inherent drying limitations.
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 ensures high-quality, time-efficient coating with reduced production costs, enabling the use of a wider range of coating materials and achieving faster drying times, resulting in improved surface hardness and reduced process duration.
Implementation Method 1
a spray device mounted in the drum reaches the small parts from all sides with a coating jet
Implementation Method 2
a drying device (6, 7, 8) which dries and/or hardens the freshly applied coating material by means of electromagnetic radiation, in particular by means of infrared radiation
Implementation Method 3
The radiation used according to the invention for drying preferably comes from either the infrared (approx. 750-1000 nm) or the ultraviolet (approx. 5 to 400 nm) wavelength range
Implementation Method 4
heats, dries and/or hardens the freshly applied coating material while it is still inside the drum
Implementation Method 5
the drying device can include a cooling device. For example, this directs an air flow onto the drying device or directs water or another liquid along it
Implementation Method 6
Another possibility is a separate air cooling of the radiator... Some embodiments of the invention direct the heated air flow... into the interior of the drum... Another embodiment uses the housing shown in Figure 3 in conjunction with a cooling circuit separate from the coating space inside the drum
Data Source
AI summary
The invention relates to a device for coating small parts (3), comprising a drum (1) which may be rotated for housing and circulating the small parts, a spray device (4, 5) for application of coating material onto the small parts within the drum and a drying device (6, 7, 8) with a radiator (6) giving off electromagnetic radiation for heating, drying and/or hardening the coating material applied to the small parts (3) within the drum (1) and corresponding method.