Peelable Protective Sheet for Mirror-Finished Coatings
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Solution Overview
Problem
The existing protective sheets for mirror-finished building materials have a weak adhesive force, leading to peeling off during storage and transport, and when peeled off, they cause deformation and degradation of the coating surface, while strong adhesive sheets risk pulling the coating, compromising its smoothness.
Innovation Solution
A building material with a base material coated to a 60-degree specular gloss of 80 or greater, using a protective sheet with an adhesive force of 2 to 8 N/20 mm and pencil hardness of HB or higher, and a fracture strength of 35 to 60 MPa, ensuring the sheet is peelable without deforming the coating and maintaining mirror-like smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective sheet with strong adhesive force is used, then the protective sheet does not peel off during storage and transport, but the coating surface deforms when the protective sheet is peeled off
Solution Approach 1:
The invention changes the physical parameters of the coating by controlling the pencil hardness to HB or higher and the 60-degree specular gloss to 80 or greater. These parameter changes enable the coating to withstand the adhesive force of the protective sheet without deforming during peeling, while maintaining the required surface smoothness for mirror finishing.
2Manufacturing precision
If a protective sheet with weak adhesive force is used, then the coating surface is not deformed when peeled off, but the protective sheet peels off and turns up during storage and transport
Solution Approach 1:
The invention optimizes the coating parameters (pencil hardness HB or higher, 60-degree specular gloss 80 or greater) to create a coating that maintains strong adhesion to the protective sheet during storage and transport, preventing peeling and turning up, while still allowing clean removal without surface deformation.
3Manufacturing precision
If the coating is made harder to prevent deformation during peeling, then the surface smoothness is maintained, but the coating becomes more prone to cracking during construction and transport
Solution Approach 1:
The invention precisely controls the coating hardness to pencil hardness HB or higher, which is the minimum threshold required to prevent deformation during protective sheet removal. This controlled hardness level maintains surface smoothness while avoiding excessive hardness that would make the coating brittle and prone to cracking during construction and transport.
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 effectively prevents peeling-off, turning-up, and displacement of the protective sheet during storage, transport, and construction, while maintaining the coating's mirror-like finish and providing excellent construction properties.
Implementation Method 1
a coating formed on the design surface
Implementation Method 2
an adhesive force between the coating and the protective sheet is 2 to 8 N/20 mm
Data Source
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AI summary
[Object] To provide a building material capable of solving the problem of peeling-off, turning-up, and displacement of a protective sheet from a coating during storage, transport, and construction and capable of solving the problem of degradation of surface finishing of the coating as a result of the protective sheet being peeled off from a coating surface of the building material. [Solution] A building material 10 includes a base material 1 having a design surface on a surface thereof, a coating 2 that is formed on the design surface and that has a surface having a 60-degree specular gloss of 80 or greater, and a protective sheet 3 affixed to the coating 2 so as to be peelable. The coating 2 has a pencil hardness of HB or higher. The adhesive force between the coating 2 and the protective sheet 3 is 2 to 8 N/20 mm.