Multilayer Papery Structure for Rigid 3D Containers and Relief Printing
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Solution Overview
Problem
Traditional corrugated cardboard exhibits poor bending rigidity in the longitudinal direction, making it difficult to produce rigid containers, and lacks the ability for relief printing or decorations, which are desirable in packaging applications.
Innovation Solution
A multilayer papery material is developed with a first three-dimensional structure sheet having reliefs created through localized stretching, and a second papery material layer coupled to define empty spaces, providing high extensibility in all directions and allowing for relief printing or decorations, with the layers being extensible to enhance rigidity and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional corrugated cardboard structure is used, then protection function is provided, but bending rigidity in longitudinal direction is poor
Solution Approach 1:
The patent combines extensible papery material with thermoplastic adhesive layers to create a composite structure. The extensible material provides bending rigidity while the thermoplastic adhesive bonds multiple layers together, forming a composite that maintains structural integrity and rigidity in the longitudinal direction, solving the container rigidity problem.
Solution Approach 2:
The patent changes the extensibility parameter of the papery material to at least 5%, which allows the material to be stretched and formed into containers while maintaining adequate bending rigidity. This parameter change enables the material to transition from a rigid corrugated structure to a formable yet rigid container structure.
2Adaptability or versatility
If traditional corrugated cardboard is used, then packaging protection is achieved, but relief printing or decorations cannot be applied
Solution Approach 1:
The patent introduces a relief structure with curved or raised surfaces on the papery material surface. This curvature enables relief printing and decorative applications by providing a tactile and visual surface variation that can receive ink or decorative elements, while the underlying extensible material maintains structural simplicity.
3Strength
If number of corrugated paper layers is increased to improve rigidity, then container rigidity improves, but weight and cost substantially increase
Solution Approach 1:
The patent changes the extensibility parameter of the papery material to at least 5%, allowing a single layer to provide both formability and structural rigidity. This eliminates the need for multiple heavy corrugated layers, reducing packaging weight while maintaining container rigidity through the material's inherent properties and thermoplastic adhesive bonding.
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 multilayer papery material achieves high rigidity in all directions, enabling the production of stable containers that can conform to various shapes and withstand stresses, while allowing for decorative relief motifs and improved packaging performance with reduced material usage.
Implementation Method 1
localized stretching of said first sheet which has an original degree of extensibility of not less than 5% in all the directions
Implementation Method 2
a layer of thermoplastic adhesive on at least one face of each of the sheets of extensible papery material
Implementation Method 3
heating said sheets to a temperature above the glass transition point of the thermoplastic adhesive
Implementation Method 4
the function of the corrugated paper layer is to protect the packaged products
Data Source
AI summary
A multilayer papery material comprising at least one first sheet of three-dimensional structure and at least one second sheet fixedly coupled to the first sheet and defining empty spaces therein, wherein at least said second sheet is made of a papery material having a degree of extensibility of not less than 5% in all directions.