Moisture Protection Cover for Posters Using Folded Plastic Layers
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Solution Overview
Problem
Existing moisture protection methods for information sheets, such as posters, are either ineffective against lateral moisture penetration or unsuitable for use with standard frames due to increased dimensions, and often require cutting the poster, which damages the motif.
Innovation Solution
A moisture protection system comprising a transparent front protective layer and a thin rear cover layer made of plastic, where the rear layer is folded over the side edges of the front layer and connected via welding or adhesive, ensuring a moisture-tight seal without increasing the overall dimensions, allowing the protected sheet to fit within standard frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a moisture protection is used that protrudes laterally beyond the format of the information sheet, then moisture protection is improved, but the moisture protection cannot be used with standard dimensions and frames
Solution Approach 1:
The rear cover layer is folded over the side edges of the front protective layer and connected by welding or adhesive bonding, creating a three-dimensional sealed structure. This folding technique allows the moisture protection to seal effectively without protruding beyond the standard frame dimensions, resolving the contradiction between moisture protection reliability and adaptability to standard frames
Solution Approach 2:
The use of thin plastic films for both the front protective layer and rear cover layer allows the structure to be compact and fit within standard frame dimensions while still providing effective moisture protection. The flexibility of thin films enables the folding and sealing mechanism without adding excessive bulk
2Strength
If a stable back plate at least 1.5 mm thick is used, then mechanical stability is improved, but the dimensions of the information sheet increase by at least 3 mm and production costs increase
Solution Approach 1:
The patent replaces the thick rigid back plate (at least 1.5 mm) with a thin plastic film rear cover layer. This thin film is folded over the edges and sealed to the front protective layer, providing sufficient mechanical stability and moisture protection without increasing the dimensions by 3 mm or more. The thin film structure achieves the required strength while maintaining compact dimensions suitable for standard frames
Solution Approach 2:
The moisture protection uses composite construction with a front protective layer and rear cover layer made of plastic materials that can be connected by material bonding. This composite plastic structure provides the necessary mechanical stability and moisture protection without requiring a thick rigid back plate, thus avoiding dimension increases and high production costs
3Ease of manufacture
If adhesive connection is used to connect the rear cover layer to the front protective layer, then ease of manufacture is improved, but moisture-tight sealing may be compromised
Solution Approach 1:
The patent extracts the adhesive layer from the sealing function and uses it only for bonding the rear cover layer to the front protective layer. The actual moisture-tight sealing is achieved through welding of the plastic layers, which provides a more reliable seal. This separation of bonding and sealing functions allows ease of manufacture through adhesive application while maintaining moisture-tight integrity through welding
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 provides effective protection against moisture ingress while maintaining the original size of the information sheet, enabling its use in standard frames without cutting, and offers mechanical stability without unnecessary material usage or optical distortion.
Implementation Method 1
The front protective layer and the rear cover layer are made of plastic that can be connected in particular by material bonding
Implementation Method 2
connected to the front protective layer on the front side by welding or adhesive bonding
Data Source
Figure 1~4
AI summary
The invention relates to a moisture protection cover for encasing information sheets (2) in the form of posters or similar items, comprising a pocket. The pocket has an opening (6) for inserting at least one information sheet (2), a transparent front protective layer (3) behind which an information sheet (2) inserted into the pocket is arranged with its front side facing outwards, and a rear cover layer (4) for protecting the information sheet (2) from moisture. Known covers either increase the dimensions of the poster too much or are not sufficiently watertight.This improves the invention in that the front protective layer (3) and the rear cover layer (4) are made of plastic, wherein the rear cover layer (4) is folded over the side edges of the front protective layer (3) at least on the two opposite side edges with a connecting edge and is connected to the front of the front protective layer (3).