Paint Protection Film Roll Structure Preventing Tunneling
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Solution Overview
Problem
Conventional paint protection films experience tunneling and distortion issues due to a hard and tenacious process film, leading to irregularities and blocking during the winding process, which affects the appearance of the film when applied to surfaces like car bodies.
Innovation Solution
A roll configuration with a laminate structure including a process film, a surface coat layer, a substrate layer, and a release liner, where the process film is formed from polyethylene terephthalate (PET) or polyolefin, and is thinner than the release liner, allowing for easier expansion and contraction, thus preventing tunneling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a relatively hard and tenacious process film is disposed on the surface coat layer to prevent irregularities and blocking, then the surface quality is improved, but the release liner becomes restrained and cannot freely expand and contract, causing distortion and tunneling
Solution Approach 1:
The patent divides the protective film structure into multiple functional layers: a process film for surface protection and a release liner for ease of handling. By segmenting the functions, each layer can be optimized independently - the process film provides surface quality while the release liner maintains flexibility
Solution Approach 2:
The process film is applied locally only to the surface coat layer where protection is needed, rather than making the entire laminate structure hard. This localized application allows the release liner to remain flexible in the regions where it needs to expand and contract
2Reliability
If a hard and tenacious process film is used to prevent blocking during winding, then the coating layer protection is improved, but tunneling occurs between the release liner and adhesive layer due to restrained expansion and contraction
Solution Approach 1:
The process film acts as an intermediary layer between the coating layer and the release liner. It provides protection to the coating layer while allowing the release liner to maintain its flexibility and prevent tunneling, mediating between the conflicting requirements
Solution Approach 2:
The laminate structure uses composite materials with different properties: the process film provides protective qualities while the release liner provides flexibility. This composite structure combines the benefits of both hard and soft materials to prevent both blocking and tunneling
3Strength
If the process film is made thicker to provide better protection, then the protective function is improved, but the restraint on the release liner increases, causing more severe distortion
Solution Approach 1:
The patent optimizes the thickness parameter of the process film to find the right balance. By controlling the thickness within specific ranges, the process film provides sufficient protection while minimizing restraint on the release liner, preventing distortion
Data Source
AI summary
A roll includes a core having a tubular shape and a laminate wound around the core. The laminate includes a process film, a surface coat layer formed from a fluorine resin, a substrate layer, an adhesive layer, and a release liner formed from polyethylene terephthalate (PET) in this order in a laminating direction. The process film is formed from at least of polyethylene terephthalate (PET), polyolefin, and polyvinyl chloride (PVC), and is thinner than the release liner.