Lid Packing Material with Multi-Wax Heat-Adhesion Layer
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Solution Overview
Problem
Existing lid packing materials for food containers face challenges in maintaining non-adhesive properties while ensuring excellent heat-adhesion strength, particularly when packaging viscous or gel-phase contents like milk and yogurt, as they often fail to prevent adhesion and maintain sealability at high temperatures.
Innovation Solution
A lid packing material with a substrate layer and a heat-adhesion layer composed of a mixture of waxes with different melting points, including carnauba wax, and hydrophobic particles, which provides super water-repellency and oil-repellency, along with patterned surfaces to enhance sealing strength and prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealant layer containing non-ionic surfactant or hydrophobic additive is used to provide water repellency, then non-adhesive property is improved, but heat-adhesion strength deteriorates
Solution Approach 1:
The invention divides the sealing structure into multiple functional layers: a base sealant layer for adhesion and a top heat-adhesion layer containing hydrophobic oxide particles for water repellency. This segmentation allows each layer to specialize in one function without compromising the other.
Solution Approach 2:
The invention uses composite materials by combining hydrophobic oxide particles (such as silica, alumina, or titania) with wax components in the heat-adhesion layer. This composite structure provides both the water-repellent properties from the hydrophobic particles and the adhesion properties from the wax matrix.
2Reliability
If hydrophobic oxide particles are exposed on the surface to improve water repellency, then non-adhesive property is improved, but heat-adhesion strength deteriorates
Solution Approach 1:
The invention applies local quality by concentrating hydrophobic oxide particles specifically in the heat-adhesion layer that contacts the container opening, while the sealant layer beneath maintains its adhesion properties. This localized application ensures water repellency where needed without compromising overall seal strength.
Solution Approach 2:
The wax components in the heat-adhesion layer act as an intermediary between the hydrophobic oxide particles and the container material. This intermediary matrix allows the hydrophobic particles to provide water repellency while the wax itself maintains bonding strength with the container.
3Ease of manufacture
If single-type wax is used in heat-adhesion layer, then manufacturing simplicity is improved, but adhesion performance at varying temperatures deteriorates
Solution Approach 1:
The invention changes the parameter of wax composition by using a mixture of waxes with different melting points (e.g., paraffin wax with lower melting point and microcrystalline wax with higher melting point). This parameter change allows the heat-adhesion layer to remain flexible at lower temperatures and maintain strength at higher temperatures.
Solution Approach 2:
The invention creates a composite wax system combining different types of waxes (petroleum-based, vegetable-based, or animal-based waxes) with complementary properties. This composite approach leverages the advantages of each wax type to achieve broad-temperature adhesion performance.
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 material effectively prevents the adhesion of viscous liquids, maintains sealing strength at high temperatures, and ensures easy flow of contents, minimizing contamination and ensuring consumers can consume the entire contents without residue.
Implementation Method 1
hydrophobic particles, which provides super water-repellency and oil-repellency
Implementation Method 2
giving high water repellency enabling adhesion prevention of food
Implementation Method 3
the sealant layer is thermally bonded (thermally fused) to promote sealability
Implementation Method 4
heat-adhesion layer includes at least two types of wax having different melting points
Data Source
AI summary
The example embodiments relate to a lid packing material for food container, and a lid packing material for food container according to an aspect of the example embodiments includes: a substrate layer; and a heat-adhesion layer formed on the substrate layer, wherein the heat-adhesion layer includes at least two types of wax having different melting points.