Profiled Fibre Moulding Lamination with Pre-formed Film
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Solution Overview
Problem
Existing methods for laminating profiled fibre mouldings with thermoplastic films struggle to achieve uniform thickness and efficient material usage, particularly with complex geometries, leading to increased construction effort and material wastage.
Innovation Solution
A method and device that involves fixing the film edge to a base plate, heating, plastic deformation using a moulding tool, and differential pressure to achieve uniform lamination, allowing for thinner film usage and improved material efficiency by combining thermoforming with a 'die stamp' technique, and optionally using vacuum or mechanical fixation and infrared heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a thermoplastic film is laminated onto a profiled fibre moulding using conventional vacuum or overpressure methods, then the film can be applied to the surface, but uniform film thickness cannot be achieved, especially with complex geometries
Solution Approach 1:
The film is pre-formed into a negative impression of the fibre moulding's outer shape before lamination. This preliminary shaping allows the film to conform to complex geometries uniformly, eliminating thickness variations that would otherwise require complex adjustment mechanisms during the lamination process itself.
Solution Approach 2:
The lamination process is divided into distinct stages: pre-forming the film separately, then applying it to the fibre moulding. This segmentation allows each stage to be optimized independently, achieving uniform thickness without requiring the entire system to be overly complex.
2Reliability
If thicker films are used to ensure adequate coating, then gas and liquid tightness is achieved, but material consumption increases
Solution Approach 1:
Differential pressure is used during lamination to ensure the film conforms completely to the fibre moulding surface, eliminating air pockets and ensuring uniform contact. This allows thinner films to achieve the same gas and liquid tightness that would require thicker films with conventional methods.
Solution Approach 2:
The film thickness parameter is optimized by changing the lamination process parameters (differential pressure, temperature, pre-forming). This allows the use of thinner films while maintaining the required reliability for gas and liquid tightness through improved process control.
3Shape
If the film is heated and deformed using conventional thermoforming, then the film can be shaped, but uniform deformation and thickness distribution are difficult to achieve
Solution Approach 1:
The film is pre-formed into a negative impression of the desired shape before the actual lamination to the fibre moulding. This preliminary deformation stage allows precise control over the film's shape and thickness distribution, which is then maintained during the final lamination process.
Solution Approach 2:
A positive moulding tool is used as an intermediary to transfer the negative impression from the pre-formed film to the fibre moulding. This intermediary tool ensures uniform deformation and thickness distribution by providing a controlled interface between the film and the final substrate.
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
Enables uniform film thickness and significant material reduction, enhancing the lamination process for profiled fibre mouldings, particularly in mass-produced products, while maintaining gas and liquid tightness without compromising quality.
Implementation Method 1
heating the film
Implementation Method 2
plastic deformation of the film by means of a moulding tool
Implementation Method 3
fixing at least the edge of the fed film to a base plate
Data Source
AI summary
Illustrated and described are a method and a device for laminating a profiled fibre moulding with a thermoplastic film. The film is laminated onto a surface of the fibre moulding to be coated by heat and differential pressure. To improve the lamination of the fibre moulding and to achieve uniform lamination thicknesses over the entire fibre moulding, the method includes the following steps: fixing at least an edge of the fed film to a base plate, heating the film, deforming the film via a moulding tool, feeding the fibre moulding, joining the fibre moulding to the pre-formed film, and removing the laminated fibre moulding.