Kraft Paper Structure for Bubble-Wrap-Like Cushioning
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Solution Overview
Problem
There is a need for an eco-friendly paper-based packaging material that can provide a cushioning effect similar to plastic air bubble film, which is not currently available in the state of the art.
Innovation Solution
A kraft paper with high strength, isotropic expansion behavior, and high stiffness is produced using specific production parameters and additives, and then formed into a three-dimensional structure with nubs or hollow spaces to mimic the cushioning effect of plastic bubble wrap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If paper-based packaging material is used instead of plastic air bubble film, then ecological and regulatory aspects are improved, but cushioning functionality and structural similarity to plastic bubble wrap are not achieved
Solution Approach 1:
The patent applies parameter changes by controlling the expansion behavior of the paper through specific production parameters (isotropic expansion) and mechanical treatment (creping) to achieve the necessary cushioning functionality while maintaining paper-based material advantages
Solution Approach 2:
The patent creates a composite structure by combining kraft paper with specific additives (starch, sizing agents, pH regulators) and processing treatments to achieve both the structural integrity and cushioning effect required for packaging
2Reliability
If kraft paper is formed into three-dimensional structure with nubs or hollow spaces, then cushioning effect is improved, but structural integrity and uniformity of formation are compromised
Solution Approach 1:
The patent controls the forming process parameters and paper properties (isotropic expansion, stiffness) to achieve uniform three-dimensional structure formation while maintaining structural integrity throughout the cushioning elements
Solution Approach 2:
The patent performs preliminary preparation of the kraft paper with specific expansion characteristics and stiffness properties before forming, ensuring that the paper is pre-conditioned to form uniformly and maintain its structural integrity during and after the forming process
3Strength
If high stiffness is achieved in kraft paper, then structural integrity of formed nubs is improved, but expandability and formation of three-dimensional structure are reduced
Solution Approach 1:
The patent optimizes the balance between stiffness and expandability by controlling paper production parameters (milling consistency, differential speed between drying sections) and adding specific additives to achieve the right mechanical properties for both structural integrity and formability
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 kraft paper achieves a uniform cushioning effect with maintained integrity, similar to plastic air bubble film, through its isotropic expansion and high stiffness properties, making it suitable as a sustainable alternative.
Implementation Method 1
The kraft paper of the present invention may have an isotropic expansion behaviour combined with a high stiffness
Data Source
AI summary
The invention relates to a kraft paper with an elongation at break in the machine direction of at least 7.5% and an elongation at break in the transverse direction of at least 7.5%, wherein the elongation at break in the machine direction and the elongation at break in the transverse direction differ by less than 2.5%, in particular by less than 1.5%, and the bending stiffness in the machine direction and the bending stiffness in the transverse direction equal at least 50 mN. The invention additionally relates to a packaging material, to a method for producing a packaging material, and to a method for producing a kraft paper.