Paper Bag Filling Method with Pre-Cut Length and Tear Strip
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Solution Overview
Problem
Existing methods for filling paper sacks are complex and error-prone, especially when dealing with non-flat goods, as they require turning and folding to reduce volume, which increases weight and material usage.
Innovation Solution
A method involving a paper sack with two openings, where the first opening is pre-closed during manufacturing, allowing easy introduction of goods through the second opening, which can be closed by cutting or sealing, and then shortened to adapt to the item's size, using adhesive strips and a tear-off mechanism for easy opening and re-closing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the flap is folded over to reduce the remaining size of the closed paper bag, then the volume is reduced, but the thickness and weight increase
Solution Approach 1:
The paper bag is pre-cut to the required length before filling, eliminating the need for post-filling folding to reduce volume. This preliminary sizing action prevents unnecessary material accumulation and weight increase while maintaining the volume reduction benefit.
Solution Approach 2:
The excess material is removed by cutting the paper bag to length before filling, extracting only the necessary portion of material needed for the final package size, thereby avoiding the weight penalty of folded-over flaps.
2Volume of moving object
If the flap is folded over to reduce the remaining size of the closed paper bag, then the volume is reduced, but the complexity and error-proneness increase
Solution Approach 1:
The paper bag is pre-cut to the exact required length before the filling operation, eliminating the complex post-filling folding and pressing operations needed to reduce volume. This preliminary sizing simplifies the closing process significantly.
Solution Approach 2:
The paper bag is manufactured as a disposable item with pre-applied adhesive strips that are used once during filling and then discarded with the package, eliminating the need for complex reusable closing mechanisms.
3Reliability
If adhesive elements are applied to the flap for closing, then the closing function is improved, but the difficulty of re-opening increases
Solution Approach 1:
A tear strip is pre-formed between the adhesive strips during manufacturing, creating a predetermined failure point that allows easy re-opening. This preliminary preparation of the tear path maintains closing reliability while enabling simple re-opening by pulling the tear strip.
Solution Approach 2:
The adhesive strips are designed to be partially discarded when the tear strip is pulled, allowing the package to be opened by sacrificing a small portion of the adhesive bonding, thereby maintaining both secure closing and easy re-opening capabilities.
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
This method reduces material usage, simplifies handling, and allows flexible packaging of different goods with minimal material waste, enabling efficient and error-free automated packaging.
Implementation Method 1
The adhesive elements can be activated separately. Furthermore, at least one tear-away element is provided by which the opening can be opened when it has been closed with a first layer of at least two adhesive elements.
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The invention relates to a paper bag (10, 11) for storing or transporting goods (48), comprising a main body (12), a first opening (44) at one end (14) of the main body (12) for removing the goods, and a flap (20) connected to the main body (12) which is designed to close the first opening (44) by folding it over. The paper bag further comprises a second opening (46) for inserting the goods (48) into the main body (12), which is located opposite the first opening (44).