Multilayer Packaging Bag Colorant Staining Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Packaging bags formed by multifold films with colorants face issues where the colorant can stain the packaged object due to high blocking properties, which degrade the mechanical properties such as pinhole resistance and impact resistance.
Innovation Solution
The colorant is contained in a layer of the multilayer films that is not in contact with the packaged object, reducing blocking properties and maintaining high mechanical properties by ensuring the colorant does not come into contact with the packaged item.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the colorant is contained in the layer in contact with the packaged object, then the design properties are enhanced, but the colorant may move to and stain the packaged object
Solution Approach 1:
The packaging film is divided into multiple layers with distinct functions: the first layer (in contact with packaged object) is transparent and free of colorant to prevent staining, while the second layer contains the colorant for design properties. This segmentation allows each layer to perform its specific function without interfering with the other.
Solution Approach 2:
The first transparent layer acts as an intermediary barrier between the colorant in the second layer and the packaged object. This intermediate layer prevents direct contact and potential staining while still allowing the colorant's visual effect to be perceived through the transparent first layer.
2Reliability
If the films forming the multifold film have high blocking properties, then the colorant can be contained, but a pinhole penetrating through multiple films may occur or the films may fail to slide and escape
Solution Approach 1:
The multifold film is segmented into multiple independent layers that can slide relative to each other. The colorant is confined to specific layers (second and subsequent layers) rather than being distributed throughout, allowing containment without requiring high blocking properties across all layers. This segmentation maintains mechanical flexibility while preventing colorant leakage.
Solution Approach 2:
The blocking properties are localized to where needed: the second layer contains the colorant and provides local containment, while the first layer remains transparent and non-blocking to maintain mechanical properties. This local quality approach ensures colorant containment without compromising overall film flexibility and slideability.
3Strength
If the colorant is contained in a layer not in contact with the packaged object, then the mechanical properties are maintained, but the design properties may be reduced
Solution Approach 1:
The patent utilizes colorants in the second and subsequent layers to achieve design properties such as transparency, translucency, or opacity as needed. The colorant placement in non-contact layers allows these optical properties to be achieved without compromising mechanical performance, as the colored layers are positioned to provide both aesthetic function and structural integrity.
Data Source
AI summary
Provided is a packaging bag which can prevent a colorant contained in a multilayer film from staining a packaged object, as well as has high mechanical strengths such as high impact resistance and high pinhole resistance. In a packaging bag formed by forming a multifold film into a bag shape, the multifold film being formed by stacking a plurality of multilayer films, a colorant is contained in a layer of the multilayer films, the layer containing the colorant being not in contact with an object to be packaged. For example, the multifold film comprises two stacked multilayer film formed by flattening a tubular multilayer film. For example, the colorant is an inorganic pigment.