PVC-Free Sealing Compound for Sterilizable Closures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The packaging industry faces challenges with PVC-containing sealing materials due to environmental concerns, health risks from plasticizers, and the need for PVC-free alternatives that maintain essential properties for sterilization and processing in vessel closures, particularly for food and beverages.
Innovation Solution
A PVC-free sealing compound composed of a mixture of at least three polymers, including polypropylene, thermoplastic elastomers, and other additives, which are selected for specific properties such as sterilizability, barrier function, and ease of processing, using dynamic mechanical thermal analysis (DMTA) to ensure suitability for sterilization and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PVC-containing sealing materials are used, then processing and usage properties are achieved, but health risks from plasticizer migration and environmental harm occur
Solution Approach 1:
The patent changes the chemical composition parameters by completely eliminating PVC and its associated plasticizers from the sealing material formulation. The new composition uses alternative polymers such as polyethylene, polypropylene, and elastomers that do not require harmful plasticizers, thereby removing the source of health risks while maintaining sealing functionality through different material mechanisms
Solution Approach 2:
The patent creates a composite sealing material combining multiple polymers (thermoplastics and elastomers) to achieve the desired balance of processing properties and safety. This composite approach allows the material to exhibit both the necessary deformability for processing and the chemical stability to prevent harmful substance migration, overcoming the limitations of single-material systems
2Reliability
If PVC-containing sealing materials are used, then sealing functionality is achieved, but environmental harm from incineration and recycling interference occurs
Solution Approach 1:
The patent converts the previously harmful PVC material into a beneficial alternative by using naturally degradable polymers. The new sealing materials are designed to be compatible with both incineration and recycling processes, transforming the environmental burden into an opportunity to demonstrate sustainable packaging solutions that protect both environment and sealing performance
3Object-affected harmful factors
If PVC-free sealing compound is developed, then health and environmental benefits are achieved, but sterilization resistance and processing properties must be maintained
Solution Approach 1:
The patent adjusts the thermal and mechanical parameters of the alternative polymers through careful selection and formulation. By controlling the glass transition temperatures, melting points, and crystallinity of the polymer components, the material achieves both sterilization resistance and safe composition, proving that health benefits do not compromise functional reliability
4Object-affected harmful factors
If PVC-free sealing compound is developed, then health and environmental benefits are achieved, but processing ease and sealing performance must be maintained
Solution Approach 1:
The patent develops a multi-polymer composite system where thermoplastics provide processing ease through appropriate melt characteristics and elastomers provide sealing performance through flexibility and adhesion. This composite formulation achieves both easy processing and reliable sealing without relying on PVC or its additives, thereby maintaining manufacturing feasibility while eliminating harmful substances
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 PVC-free composition provides a cost-effective, safe, and efficient sealing solution for vessel closures that can withstand sterilization, maintain sealing properties, and prevent the migration of harmful substances into food, while allowing for high production speeds and compatibility with various packaging materials.
Implementation Method 1
From the measured values, the viscoelastic properties of a sample can be determined as a function of time and temperature. In addition to the glass transition temperature Tg, these are the storage modulus G' and the loss modulus G" of the material.
Implementation Method 2
From the measured values, the viscoelastic properties of a sample can be determined as a function of time and temperature. In addition to the glass transition temperature Tg...
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to compositions (compounds) which can be used as sealing material in vessel closures under sterilization conditions. More specifically the invention relates to compositions of this kind which are suitable for rotatingly openable vessel closures and vacuum closures such as, for example, lug twist closures and more particularly Press-on/Twist-off® closures, and which demonstrate reduced migration of unwanted substances.