Paper Bag Foil Liner Prevents Fiber Contamination
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Solution Overview
Problem
Paper fibers often contaminate products when paper sacks are opened, as the existing tear-off mechanism does not prevent fibers from entering the contents.
Innovation Solution
A detachable film is inserted under the cover sheets of paper sacks, which remains closed until the sack is fully opened, preventing paper fibers from entering the product and allowing controlled access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cover sheet is torn off to open the paper sack, then the sack can be opened for access to contents, but paper fibers contaminate the product
Solution Approach 1:
A foil liner is introduced as an intermediary layer between the paper sack interior and the product. The foil remains attached to the sack while the paper cover sheet is torn off, preventing paper fibers from contacting the product. The foil acts as a mediator that allows sack opening while maintaining product cleanliness.
Solution Approach 2:
The opening mechanism is segmented into two independent components: the paper cover sheet with tear strip for opening, and the foil liner for product protection. This segmentation allows the paper portion to be torn away for access while the foil portion remains to prevent contamination.
2Object-affected harmful factors
If a foil liner is added to prevent fiber contamination, then product purity is improved, but device complexity increases
Solution Approach 1:
The foil liner is merged with the paper sack structure through adhesive bonding during manufacturing. The foil is applied to the interior surface of the paper sack and secured with adhesive, creating a combined structure that functions as a single unit while providing both opening capability and contamination protection.
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
Ensures that paper fibers do not contaminate the product during opening, providing a clean and controlled access to the contents by keeping the sack closed until the film is removed.
Implementation Method 1
secured to the paper sack with adhesive
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a paper bag for packaging bulk material, comprising a standing bottom (2) and a valve bottom (3), a front wall (4) and a rear wall, the front wall and the rear wall being glued to each other in an overlapping relationship, the paper bag further comprising cover sheets (5, 5') for closing the standing bottom (2) and the valve bottom (3), wherein the cover sheet (5) of the standing bottom (2) and/or of the valve bottom (3) is provided with a tear-open strip (6) which extends over the entire length of the bottom. It is characterized in that a foil (9) is inserted below the standing bottom cover sheet (5) and/or below the valve bottom cover sheet (5') and is glued removably to the paper bag (1) in such a manner that after tearing open the standing bottom cover sheet (5) and/or the valve bottom cover sheet (5'), the foil (9) still closes the paper bag (1) completely and releases the product only after said foil is peeled off.