Film Application Method Reducing Shock Lines
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Solution Overview
Problem
The application of adhesive-backed films to wide base materials often results in aesthetically undesirable shock lines or adhesion creases, particularly at the starting and ending points of the application process, which affect the quality of the film application.
Innovation Solution
The use of an application method involving a pressing unit that starts from a first extended portion and ends at a second extended portion, connected to a main portion, to apply the film, minimizing the generation of shock lines by ensuring a consistent pressing action across the film's surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a squeegee is used to press the film against the base material surface, then the film can be applied to the base material, but shock lines or adhesion creases are generated at the boundary between pressed and non-pressed portions
Solution Approach 1:
The film is divided into a main portion and extended portions at both ends. The pressing operation is segmented into distinct phases: first pressing the extended portions, then pressing the main portion. This segmentation allows the pressing action to be distributed along the film length, preventing concentration of pressure at any single boundary and thereby eliminating shock lines and adhesion creases.
Solution Approach 2:
The extended portions of the film are pressed first before pressing the main portion. This preliminary action of pressing the extended portions creates a gradual transition zone that prevents sudden pressure changes at the boundaries. By preparing the film structure in advance through pressing the extended portions, the subsequent pressing of the main portion proceeds smoothly without generating shock lines.
2Productivity
If the squeegee presses the film starting from one end, then the film application process can be completed, but shock lines are generated at the starting point and ending point of pressing
Solution Approach 1:
The film pressing operation is segmented into multiple stages: first pressing the extended portions at both ends, then pressing the main portion. This segmentation allows the operator to maintain consistent pressing quality throughout the entire film length, avoiding the shock lines that would result from a single continuous pressing motion. The segmented approach ensures high productivity while maintaining manufacturing precision.
3Force
If a narrow squeegee is used, then the film can be pressed with sufficient force, but shock lines are generated at the boundary between the squeegee width and film width
Solution Approach 1:
The film is segmented into a main portion and extended portions that extend beyond the squeegee width. By pressing the extended portions first, the operator creates a gradual transition zone that eliminates shock lines at the width boundary. The extended portions act as a buffer zone that distributes the pressing force smoothly across the film width.
Solution Approach 2:
The extended portions of the film are treated differently from the main portion - they are pressed first and serve as a transition zone. This local differentiation in pressing sequence creates a gradual force distribution that prevents shock lines at the boundary, while still allowing sufficient pressing force to be applied to the main portion.
Data Source
AI summary
An application method of applying a film F having a main portion 71, an extended portion 72 connected to a first end 71x of the main portion 71, and an extended portion 73 connected to a second end 71y opposing the first end 71x in the main portion 71 to a base material by an application device having an application mechanism, including the steps of: pressing the extended portion 72 using the application mechanism; applying the main portion 71 to the base material by moving the application mechanism that presses the extended portion 72 from the extended portion 72 to the extended portion 73 via the main portion 71; and stopping the application mechanism moved to the extended portion 73 and separating the application mechanism from the extended portion 73.