Moisture-Permeable Nonwoven Food Packaging With Uniform Holes
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Solution Overview
Problem
Existing non-woven fabrics for luxury food packaging exhibit non-uniform pore sizes and shapes, leading to issues with mechanical properties, such as tensile strength, and inefficient transport of aroma or active agents due to either too large or too small holes.
Innovation Solution
A moisture-permeable, microporous luxury food packaging material with uniformly distributed holes, formed by piercing with heated needles, ensuring a diameter fluctuation of +/-30% around a median value of 250 to 1000 μm, and fiber reorientation to create a funnel shape, enhancing absorption and transport capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If non-woven fabric is used with random fiber distribution, then manufacturing is simple and cost-effective, but pore size and shape vary broadly leading to poor mechanical properties and inefficient substance transport
Solution Approach 1:
The patent applies preliminary action by pre-defining the pore structure through a mesh-like support framework before adding the active fiber layer. This predetermined geometric structure ensures uniform pore sizes and shapes are established in advance, eliminating the random variation that occurs with conventional random fiber distribution methods.
Solution Approach 2:
The patent employs composite materials by combining a mesh-like support structure (providing geometric precision and structural integrity) with an active fiber layer (providing functional properties). This composite approach allows the mesh framework to control pore uniformity while the fiber layer contributes to the fabric's functional performance, resolving the contradiction between structural precision and manufacturing simplicity.
2Productivity
If holes are made too large to improve substance transport, then absorption and transport of aroma/active agents improves, but particles penetrate through the packaging material
Solution Approach 1:
The patent applies local quality by creating distinct functional zones within the fabric structure. The mesh-like support structure provides localized structural reinforcement at pore boundaries to prevent particle penetration, while the centers of the pores maintain sufficient opening size for efficient substance transport. This spatial differentiation of structural properties allows simultaneous optimization of both transport efficiency and particle retention.
3Object-affected harmful factors
If holes are made too small to prevent particle penetration, then particle retention improves, but liquid transport and absorption of substances is impeded
Solution Approach 1:
The patent applies segmentation by dividing the fabric into two functional components: a mesh-like support structure that segments and defines pore boundaries for particle retention, and an active fiber layer that provides pathways for liquid transport within the confined pore spaces. This segmentation allows each component to optimize its specific function without compromising the other.
4Reliability
If non-woven fabric contains high proportion of thermoplastic binder (up to 50%) for thermal welding capability, then bag-like form welding is enabled, but porosity and moisture permeability are reduced
Solution Approach 1:
The patent applies porous materials by designing a mesh-like support structure with inherent geometric porosity that maintains high moisture permeability. This structured porosity achieves thermal welding capability through the mesh geometry and localized binder application rather than requiring high concentrations of thermoplastic binder throughout the entire fabric, thus preserving moisture permeability while enabling welding functionality.
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 uniform hole sizes and improved mechanical stability, allowing efficient transport and absorption of substances within the packaging, while maintaining tensile strength and preventing unwanted particle penetration.
Implementation Method 1
the needles can be heated at least during the piercing process such that the thermoplastic binder at least partially melts or softens at the contact points to the needle
Implementation Method 2
allowing efficient transport and absorption of substances within the packaging
Data Source
AI summary
The invention relates to moisture-permeable, microporous luxury food packaging material made of nonwoven fabric, consisting of a carded web of staple fibres and at least one thermoplastic binder. According to the invention the nonwoven fabric has a uniformly distributed perforation in the form of a plurality of holes, the fluctuation around the median value of the diameter of the holes being in the region of +/−30%. In the method according to the invention the perforation is formed by creating holes by means of piercing the pre-bonded nonwoven fabric.