3D Sublimation Printing With Infrared Heating and Boundary-Layer Airflow
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Solution Overview
Problem
Achieving uniform heat and pressure distribution in sublimation printing on three-dimensional articles is challenging due to difficulties in evenly applying heat and pressure, leading to issues like poor image transfer and potential film rupture, especially as the film size increases.
Innovation Solution
A sublimation printing apparatus utilizing an infrared heater in combination with airflow inducing means, such as centrifugal fans, to create a high-velocity airstream or airknife, which breaks down the boundary layer and ensures efficient heat transfer, allowing for direct heat application without the need for an enclosed environment, and includes a control unit to manage the heating stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heating methods are used to apply heat to the film, then the film can be heated, but uniform temperature distribution is difficult to achieve and enclosed environment is required
Solution Approach 1:
The patent replaces conventional convection-based heating (which requires enclosed environments and complex airflow control) with infrared radiation heating. The infrared heater directly radiates thermal energy to the film, eliminating the need for enclosed chambers and complex airflow management systems while achieving superior temperature uniformity.
Solution Approach 2:
The heating system is segmented into multiple infrared heating elements positioned at different locations and angles to target specific areas of the film. This segmented approach allows independent control of different zones, ensuring uniform temperature distribution across the entire film surface without requiring a fully enclosed environment.
2Loss of energy
If high velocity air flow is applied to enhance heat transfer, then heat transfer efficiency improves, but air trapped between film and object causes poor image transfer and film rupture
Solution Approach 1:
The patent eliminates the mechanical airflow system entirely and replaces it with infrared radiation heating combined with controlled natural convection. This substitution removes the harmful effect of high-velocity air trapping while maintaining efficient heat transfer through direct infrared heating of the film-substrate interface.
Solution Approach 2:
Instead of applying excessive high-velocity air flow that causes problems, the system uses moderate infrared heating with minimal airflow. The infrared radiation provides sufficient heat energy without requiring high air velocity, thus achieving effective heat transfer without the harmful effects of air entrapment.
3Area of stationary object
If film size is increased to cover larger surfaces, then printing area increases, but heat uniformity and air trapping problems become more prevalent
Solution Approach 1:
The infrared heating system is divided into multiple independent heating zones that can be individually controlled. Each zone targets a specific portion of the large film, allowing precise temperature management across the entire printing area. This segmentation ensures uniform heat distribution even on large-scale films without the problems associated with conventional single-zone heating.
4Speed
If conventional heating methods are used, then heating can be applied, but rapid temperature increase is difficult to achieve
Solution Approach 1:
The patent replaces slow conventional convection heating with infrared radiation heating, which directly transfers thermal energy to the film molecules. This electromagnetic radiation method provides rapid heating because it bypasses the intermediate step of heating air and directly energizes the film material, achieving fast temperature increase with good control 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 rapid and uniform temperature distribution, optimizing the sublimation process, reducing machine downtime, and ensuring high-quality image transfer on three-dimensional objects without film rupture, while allowing operators to monitor the thermoforming stage effectively.
Implementation Method 1
an infrared heater mounted adjacent the substrate and operable to direct infrared radiation toward the substrate, e.g. for heating the film to thermoform it over the object
Implementation Method 2
the airflow inducing means breaks down the boundary layer over the film surface and therefore encourages efficient heat transfer across the film
Implementation Method 3
airflow inducing means being operable to induce a flow of air onto and/or over and/or across the film
Implementation Method 4
Sublimation is when a substance, in this case an ink or dye, transitions between the solid and gas state without passing through the liquid state
Data Source
AI summary
A sublimation printing apparatus (1) which includes a tray (2) for receiving a three dimensional object (10) having a film (12) carrying sublimable ink, an infrared heater (3) mounted adjacent the tray (2) and a airflow inducing device (4). The infrared heater (3) is operable to direct infrared radiation toward the tray (2). The airflow inducing device (4) is operable to induce a flow of air across the film (12).