3D Sublimation Printing with Infrared Heating and Airknife Flow
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Solution Overview
Problem
Achieving uniform pressure and heat distribution in sublimation printing on three-dimensional articles is challenging, leading to inconsistent ink transfer and potential machine downtime due to trapped air and film rupture, especially with larger films.
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 and uniform heating without the need for an enclosed environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heating methods are used to heat the film for thermoforming and sublimation, then the heating process requires an enclosed environment to maintain controlled temperature distribution, but this makes it difficult for operators to monitor the thermoforming stage and increases device complexity
Solution Approach 1:
The patent replaces conventional convection-based heating (which requires enclosed environments for controlled temperature distribution) with infrared radiation heating. The infrared heater directly radiates thermal energy to the film, eliminating the need for enclosed chambers while achieving uniform temperature distribution. This substitution of heating mechanism resolves the contradiction by maintaining temperature control without mechanical enclosure.
2Productivity
If air is present between the film and the object during heating, then the heating process can proceed, but trapped air expands and causes poor image transfer and film rupture
Solution Approach 1:
The patent introduces a vacuum system that applies negative pressure to the chamber during the heating process. This pneumatic control removes trapped air between the film and the object, preventing air expansion that would cause film rupture or poor image transfer. The vacuum mechanism is activated during heating and deactivated after the process, allowing efficient heating while ensuring film integrity.
3Area of stationary object
If the film size is increased to accommodate larger printing requirements, then the printing capacity is improved, but air trapping and film rupture become more prevalent
Solution Approach 1:
The vacuum system effectively removes air from larger film areas by applying negative pressure across the entire film surface. This pneumatic approach scales well with film size, preventing air pockets from forming or expanding even on large films, thereby maintaining reliability regardless of the film area being processed.
Solution Approach 2:
By replacing enclosed convection heating with open infrared radiation heating combined with vacuum control, the system can handle larger films without the air trapping problems that plague conventional enclosed systems. The infrared radiation penetrates and heats the film uniformly across large areas while the vacuum prevents air interference.
4Speed
If conventional heating methods are used, then the heating process is slow and requires enclosed environments, but infrared heating provides rapid temperature increase without enclosure
Solution Approach 1:
The patent substitutes conventional convection heating with infrared radiation heating. Infrared heaters emit electromagnetic radiation that directly heats the film molecules, causing rapid temperature increase without requiring heated air circulation. This eliminates the need for enclosed environments while achieving fast heating speeds, resolving the contradiction between heating speed and temperature control requirements.
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 combination enables rapid and uniform temperature distribution across three-dimensional objects, improving ink transfer quality and reducing machine downtime by preventing air trapping and film rupture, while allowing operators to monitor the thermoforming stage effectively.
Implementation Method 1
an infrared heater mounted adjacent the substrate, wherein the infrared heater is operable to direct infrared radiation toward the substrate
Implementation Method 2
airflow inducing means being operable to induce a flow of air onto and/or over and/or across the film
Implementation Method 3
the airflow inducing means breaks down the boundary layer over the film surface and therefore encourages efficient heat transfer 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
Implementation Method 5
the ink is heated until it sublimes into a gas, diffuses onto the printing media and solidifies
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
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).