Flat Bag Sealing Structure for Contamination-Free Sheet Removal
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Solution Overview
Problem
Conventional individually packaged wet sheets and face masks are difficult to remove from flat bags without contaminating fingers and hands with cosmetic material, and the sheets often wrinkle or tear when spread for use.
Innovation Solution
A flat bag design with a joined part at the top allows easy opening and removal of the sheet, minimizing hand contamination and facilitating easy spreading without wrinkles or tears, by using a sealed and non-sealed part configuration that reduces the force needed to open the bag and allows the sheet to be lifted out and spread smoothly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fingers are inserted into the flat bag to remove the sheet, then the sheet can be grasped and removed, but cosmetic material attaches to the fingers and hand causing contamination
Solution Approach 1:
The patent introduces an intermediary mechanism (the specific opening structure with notched corners and sealed edges) that mediates between the user's fingers and the cosmetic material. The opening is designed to allow finger insertion for grasping while the sealed edges and notched corners control the opening process to minimize cosmetic material contact with the hand, thus protecting the user from contamination while still enabling sheet removal.
2Ease of operation
If the folded sheet is spread while being grasped, then the sheet can be opened for use, but the sheet wrinkles or tears due to weakness
Solution Approach 1:
The patent applies preliminary action by designing the opening structure (notched corners and sealed edges) to facilitate controlled opening before the sheet is fully removed. This allows the sheet to be partially opened and stabilized before complete removal and spreading, preventing wrinkles and tears that would occur if the sheet were spread immediately while still constrained in the bag.
3Reliability
If a small area wet sheet is individually packaged, then drying and bacterial growth are prevented, but the opening created is small causing cosmetic material to attach to wider areas on the fingers
Solution Approach 1:
The patent applies asymmetry by designing the opening with notched corners at specific positions rather than a uniform opening. The notched corners create an asymmetric opening pattern that allows controlled finger insertion while minimizing the contact area with cosmetic material. This asymmetric design enables preservation benefits of individual packaging while reducing finger contamination even for small area sheets.
Data Source
Figure 1(a)~1(d)
Figure 2a~2b
Figure 2c~2d
AI summary
With a conventional individually packaged wet sheet, face mask, or other sheet, not only the fingertips grasping the sheet but also other fingers and the palm and back of the hand get dirtied by the cosmetic material, etc., as the fingers are inserted into the flat bag. The present invention aims to solve this problem, while simplifying the operation of spreading the folded-up sheet that has been removed from the flat bag and thereby allowing the removed sheet to be attached on the face quickly and reliably without dirtying the fingers. To this end, a flat bag storing a liquid-impregnated sheet-shaped object is provided that has on its top side a joined part constituted by two films sealed together, wherein the sealed part forming the joined part is formed at the base of the joined part over the entire length of the joined part, the edge of the joined part is not sealed but forms a non-sealed part instead, and the end edge of one of the two films constituting the non-sealed part is formed longer than the end edge of the other film.