Reclosable Paper-Plastic Bag With Segmented Adhesive Label
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Solution Overview
Problem
Conventional paper bags with a polymeric lining cannot be reliably sealed after the first opening due to issues with adhesive labels adhering to the paper layer, leading to increased packaging costs and ineffective moisture protection.
Innovation Solution
A reclosable paper-plastic laminate bag design featuring a rear window on the paper layer closed by an inner polymeric film, allowing an easy open adhesive label to be permanently attached to the paper edge and releasably attached to the polymeric film for repeated opening and closing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an adhesive label is used to seal a paper-plastic laminate bag, then the bag can be closed after partial consumption, but the adhesive label adheres to the paper layer and cannot be removed for resealing
Solution Approach 1:
The adhesive label is divided into two separate portions: a first portion permanently attached to the paper layer edge and a second portion attached to the polymeric film. This segmentation allows the second portion to be removed and reattached for resealing without damaging the paper layer or the permanent attachment point.
Solution Approach 2:
The polymeric lining film acts as an intermediary between the adhesive label and the bag contents. The second portion of the adhesive label attaches to this film, which provides a suitable surface for reversible adhesion, unlike the paper layer that would permanently bond to the adhesive.
2Reliability
If special glues or silicone papers are used to enable adhesive label removal, then the bag can be resealed, but the packaging cost increases unacceptably
Solution Approach 1:
The second portion of the adhesive label is designed as a disposable component that can be removed and reattached multiple times. It does not require special expensive materials like silicone papers or specialized glues,而是 using conventional adhesive materials that can provide sufficient temporary bonding to the polymeric film.
Solution Approach 2:
The adhesive properties are optimized to provide strong initial bonding that can be cleanly removed and reattached. The adhesive formulation and application parameters are controlled to ensure reliable temporary adhesion to the polymeric film without permanent damage or residue, enabling multiple sealing cycles with standard materials.
3Strength
If the adhesive label is attached directly to the paper layer, then the label provides structural support, but the paper layer prevents reliable removal and reuse of the label
Solution Approach 1:
The label is segmented into two portions with different attachment characteristics: the first portion permanently attached to the paper layer for structural support, and the second portion attached to the polymeric film for reversible sealing functionality.
Solution Approach 2:
Different portions of the label system have different attachment qualities: the first portion has permanent strong adhesion to the paper layer, while the second portion has temporary reversible adhesion to the polymeric film. This local differentiation of adhesion properties enables both structural integrity and reusability.
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
Enables reliable sealing and resealing of paper-plastic laminate bags after partial content removal without special materials or glues, optimizing production costs and maintaining product freshness.
Implementation Method 1
the polymeric film layer gives a barrier protection
Implementation Method 2
an easy open adhesive label is permanently attached with its first portion on the paper layer of the upper edge of the bag and with its second portion in a releasable manner on the inner polymeric lining film
Implementation Method 3
upper and lower heat-sealed edges
Data Source
AI summary
A reclosable bag (1) made of a paper-plastic laminate, having a rear side (8) and upper and lower heat-sealed edges (3, 4), comprises an external layer (5) made of paper and an inner polymeric lining film (7). A rear window (9) closed by the inner polymeric lining film (7) is formed in the external paper layer (5) on the rear side (8) of the bag (1). An easy open adhesive label (10) is permanently attached through a first portion (11) thereof on the external paper layer (5) of the upper edge (3) of the bag (1), and through a second portion (12) thereof releasably on the internal polymeric lining film (7) that closes the rear window (9).