Laminated Cellulose Packaging with Cavitated Print Substrate
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Solution Overview
Problem
Current liquid food packaging materials are costly and inefficient, with challenges in reducing the thickness of cellulose-based bulk layers without compromising mechanical stability and barrier properties, and in replacing aluminum foil with alternative barrier layers that are cost-effective and environmentally friendly.
Innovation Solution
A laminated cellulose-based packaging material with a brown or dark bulk layer, an innermost heat-sealable thermoplastic polymer layer, and a white, cavitated print substrate layer made from a thermoplastic polymer composition with mineral filler particles and titanium oxide pigment, which provides mechanical stability and a suitable surface for printing while hiding the dark bulk layer color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of cellulose-based bulk layers is reduced to lower cost, then material cost decreases, but mechanical stability and barrier properties deteriorate
Solution Approach 1:
The patent applies composite materials by combining cellulose-based bulk layers with plastic layers (polyethylene terephthalate or polypropylene) to create a laminated structure. This composite approach allows reduction of cellulose thickness while maintaining mechanical stability through the plastic layers, resolving the contradiction between cost reduction and strength preservation.
Solution Approach 2:
The patent applies local quality by assigning different functions to different layers: the cellulose bulk layers provide bulk structure and absorbency, while the plastic layers provide mechanical strength, barrier properties, and surface quality. This functional differentiation allows optimization of each layer's thickness based on its specific role, enabling cost reduction without compromising overall performance.
2Object-affected harmful factors
If aluminum foil is replaced with alternative barrier layers to be environmentally friendly, then environmental compatibility improves, but barrier properties and cost-effectiveness may deteriorate
Solution Approach 1:
The patent replaces aluminum foil with a composite laminate structure consisting of cellulose-based layers and plastic barrier layers. This composite approach provides comparable barrier properties against moisture and gases while being environmentally more acceptable, as it eliminates aluminum foil and uses organic-based materials that can be more easily recycled or composted.
Solution Approach 2:
The patent uses parameter changes by selecting specific plastic materials (polyethylene terephthalate or polypropylene) with appropriate thicknesses and properties to achieve the required barrier performance. By carefully controlling the parameters of the plastic layers, the patent maintains reliable barrier properties while using environmentally friendlier materials than aluminum foil.
3Illumination intensity
If a white print substrate layer is added to hide the dark bulk layer color, then appearance quality improves, but manufacturing complexity increases
Solution Approach 1:
The patent merges the print substrate function with the outer plastic layer. The plastic layer serving as the outermost layer of the laminate also functions as the white print substrate, eliminating the need for a separate dedicated print substrate layer. This merging reduces manufacturing complexity while maintaining appearance quality.
Solution Approach 2:
The outer plastic layer performs multiple functions simultaneously: it provides mechanical strength, acts as a barrier layer, serves as the print substrate for branding and information, and provides the white background to hide the dark bulk layer color. This multi-functionality reduces the number of separate layers needed, simplifying manufacturing.
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
The solution achieves cost-effective packaging with maintained mechanical stability and barrier properties, enabling long-term storage of liquid foods without compromising nutritional value, hygiene, or taste, and allows for customizable exterior designs without increasing production complexity.
Implementation Method 1
a white pre-manufactured, oriented, cavitated film from a thermoplastic polymer composition
Implementation Method 2
outer- and innermost heat sealable thermoplastic polymer layers
Implementation Method 3
both of the longitudinal edges of the web being united to each other in an overlap joint by welding together
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
The present invention relates to a laminated cellulose-based liquid or semi-liquid food packaging material, comprising a brown or dark bulk layer from non-bleached, cellulose-based material, an outside substrate layer having a white print surface to hide the dark colour of the bulk layer, and on the inside an oxygen barrier layer and an innermost heat sealable layer. The invention further relates to the method for manufacturing the laminated packaging material and to a packaging container for liquid food packaging, comprising the laminated packaging material.