Partial Adhesive Protective Bag for Stamps
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Solution Overview
Problem
Existing self-adhesive protective bags for stamps face handling difficulties and are challenging to mass-produce due to issues with adhesive application and thickness differences, leading to deformation of carriers and inability to easily replace stamps.
Innovation Solution
A protective bag design where the lower film is only partly coated with a thin adhesive, allowing for easy handling and precise alignment, enabling large-scale production without deformation of carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the entire surface of the lower film is coated with adhesive to enable self-adhesive protective bags, then the handling and attachment to carriers becomes easier, but the thickness differences prevent stacking and mass production
Solution Approach 1:
The adhesive is applied only to specific local areas of the lower film (edge regions or discrete points) rather than the entire surface. This localized adhesive application provides sufficient attachment capability to carriers while maintaining uniform overall thickness, enabling both easy handling and mass production through stacking.
2Ease of operation
If self-adhesive protective bags are made with full-surface adhesive, then attachment to carriers is simplified, but the bags cannot be easily replaced and stamps cannot be exchanged
Solution Approach 1:
By limiting adhesive to specific local areas rather than the full surface, the protective bag maintains strong attachment to carriers while leaving other areas accessible. This allows stamps to be removed and replaced, and the protective bags themselves to be exchanged, providing both attachment simplicity and replacement versatility.
3Ease of operation
If protective bags are made with full-surface adhesive, then handling is easier, but carrier deformation occurs due to water-based adhesive application
Solution Approach 1:
The adhesive is applied only to localized areas (edges or discrete points) rather than the entire surface. This minimizes the amount of water-based adhesive contacting the carrier, thereby reducing or eliminating carrier deformation while still providing sufficient handling ease through the self-adhesive properties at the adhesive locations.
4Ease of operation
If adhesive tape is used for self-adhesive protective bags, then stamp collector requirements are met, but thickness differences prevent precise cutting in stacks
Solution Approach 1:
Instead of using adhesive tape that creates significant thickness variations, the invention applies adhesive directly in localized areas. This maintains the self-adhesive functionality needed by stamp collectors while ensuring uniform overall thickness, enabling precise cutting of protective bags from stacked sheets.
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 facilitates easy handling and mass production of protective bags, allowing for precise alignment and attachment to carriers without deformation, and enables easy removal and replacement of stamps.
Implementation Method 1
with a pressure-sensitive adhesive (5)
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a protective bag (1) for stamps or similar products, which has a pressure-sensitive adhesive (5) in a partial area of the lower film (3; 3´). In an embodiment comprising a slit (4), a lower film (3; 3´) which is split in two parts is created. The lower film (3;3´) that is split or not split is partially provided with an extremely thin layer of pressure-sensitive adhesive (5). The cover (2), however, does not only cover the pressure-sensitive adhesive (5), but also the entire lower film (3;3´) and is thus accurately fitting with regard to the outer dimensions of the strips, resulting in only minor height variations of the stacked strips. Said stacks can be readily processed into protective bags (1).