Impermeable Inflatable Shape for Uniform Film Lamination
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Solution Overview
Problem
Existing lamination methods and machines face challenges in achieving uniform pressure and heat distribution for gluing films to three-dimensional articles, leading to inconsistent and suboptimal adhesion due to air permeability issues and inefficient heat transfer.
Innovation Solution
A device and method utilizing an impermeable inflatable shape with high thermal transmittance and diffusivity to ensure uniform heat distribution and pressure application, preventing direct gas contact with the film and article, and using a thermal adhesive to facilitate a stable and durable bond.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an air-permeable shape is used for lamination, then heat and pressure can be applied to activate adhesive, but the pressure becomes non-uniform and fluctuating due to air dispersion and shape deformation
Solution Approach 1:
The patent introduces a heat transfer medium (fluid) that circulates through channels in the forming element, serving as an intermediary to transfer heat uniformly without direct contact with the film. This mediator approach allows precise temperature control while maintaining uniform pressure through the flexible element's design, resolving the contradiction between heat activation and pressure uniformity.
Solution Approach 2:
The patent uses a hydraulic or pneumatic system with fluid circulation through channels in the forming element to apply and maintain uniform pressure. The fluid pressure system allows consistent pressure distribution across the film surface, preventing the fluctuating pressure issues caused by air dispersion in conventional systems.
2Stress or pressure
If air pumping with higher flow rate is used to overcome air dispersion, then pressure can be maintained, but energy waste increases
Solution Approach 1:
The patent employs a closed-loop fluid circulation system where heated fluid is pumped through channels in the forming element and then cooled before recirculation. This hydraulic/pneumatic system is far more energy-efficient than continuous high-flow air pumping, as it maintains pressure with minimal energy input and recovers heat through the cooling phase, directly addressing the energy waste problem.
Solution Approach 2:
The system recovers heat from the fluid after it has transferred thermal energy to the adhesive, cooling the fluid in a heat exchanger before recirculating it back to the forming element. This heat recovery process significantly reduces the energy required for heating, eliminating the continuous high-energy input required by air pumping systems.
3Temperature
If hot air is pumped through air-permeable shape, then adhesive activation occurs, but heat transmission is non-uniform and slow due to high inertia
Solution Approach 1:
The patent uses fluid circulation through embedded channels to conduct heat directly to the adhesive layer. Fluids have higher specific heat capacity and thermal conductivity than air, enabling faster and more uniform heat transmission. The forced circulation system eliminates the high thermal inertia of air, reducing heating time significantly.
Solution Approach 2:
The patent replaces the convective heat transfer mechanism of hot air with a controlled fluid circulation system through channels. This substitution allows precise control of heat flow rate and distribution, achieving uniform and rapid heating without the inefficiencies of air-based convection.
4Stress or pressure
If air-permeable shape is used, then inflation and pressing is possible, but direct contact of hot air with film and article causes non-uniform gluing properties
Solution Approach 1:
The patent uses a fluid-circulating forming element as an intermediary between the heat source and the film-adhesive assembly. The fluid transfers heat through the walls of the forming element without direct contact with the film, ensuring uniform heat distribution and consistent gluing properties while maintaining the necessary pressing force through fluid pressure.
Solution Approach 2:
The forming element itself acts as a flexible shell that conforms to the three-dimensional article shape while containing the fluid. This flexible shell design allows uniform pressure distribution through its compliance, while the fluid circulation within channels ensures uniform heat transmission, preventing the non-uniform gluing caused by direct hot air contact.
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 solution achieves a high-quality, uniform lamination process with consistent pressure and temperature parameters, enhancing the durability of the adhesive bond and preventing contamination, resulting in improved adhesion and reduced energy waste.
Implementation Method 1
The inflatable shape is configured for pressing against the article and for transmit, to the article, heat useful for activating the adhesive
Implementation Method 2
introducing, in the inflatable shape, a heated gas for inflating the inflatable shape, pressing the inflatable shape against the film and the film against the article and activating the thermal adhesive
Data Source
AI summary
A device for applying a film to a three-dimensional article includes an inflatable shape having at least one opening connected or connectable to a source of heated gas. The inflatable shape is configurable in a deflated configuration and in an inflated configuration when the heated gas is introduced into the inflatable shape through the opening. The inflatable shape is configured and sized to allow an article to be placed thereon, at least when the inflatable shape is in the deflated configuration. In the inflated configuration, the inflatable shape is configured for pressing against the article and for adhering, to the article, a film interposed between the inflatable shape and the article. The inflatable shape is impermeable to the heated gas and has a thermal transmittance greater than 600 W/m2K.