Polyester Strapping Band with High-Melting Polyolefin
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Solution Overview
Problem
Existing plastic strapping materials lack temperature stability and strength, particularly when exposed to high temperatures, and often require adjustment of welding tools for end joining, which complicates usage and reduces customer acceptance.
Innovation Solution
The development of plastic strapping comprising up to 90% polyester, 1-5% polyolefin, and 5-10% fibrous material by weight, with the fibrous material having a melting temperature above 300°C, allowing for direct extrusion and enhanced molecular and fiber orientation for increased strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If plastic strapping is made from polyester and polyolefin mixture to increase tensile strength, then resistance to longitudinal splitting is improved, but temperature stability is compromised
Solution Approach 1:
The patent changes the material composition parameters by using high-melting-point polyolefin (melting point above 100°C, preferably above 120°C) instead of conventional low-melting-point polyolefin. This parameter change allows the strapping to maintain both high tensile strength and temperature stability, as the polyolefin component no longer limits the maximum operating temperature to around 130°C.
Solution Approach 2:
The patent uses a composite material system consisting of polyester (up to 95% by weight) and high-melting-point polyolefin (5-20% by weight). This composite structure combines the high strength and stiffness of polyester with the toughness and elongation properties of polyolefin, while the high melting point of the polyolefin component ensures temperature stability during thermal welding processes.
2Ease of manufacture
If welding temperature is adjusted to join ends of plastic strapping, then joining is achieved, but customer acceptance is reduced due to complexity
Solution Approach 1:
The patent standardizes the melting point of the polyolefin component to be above 100°C (preferably above 120°C), which allows for consistent welding parameters across different strapping products. This parameter standardization eliminates the need for adjusting welding tool temperatures for different strapping types, simplifying the welding process and improving ease of manufacture.
3Quantity of substance
If material thickness is reduced to save material, then resource efficiency is improved, but closure strength is reduced
Solution Approach 1:
The patent uses a composite material system where polyester provides high strength and stiffness, while polyolefin (5-20% by weight) provides toughness and elongation. This composite structure allows for reduced material thickness while maintaining closure strength, as the optimized material composition compensates for the reduced thickness.
Solution Approach 2:
The patent optimizes the composition parameters, specifically using 5-20% polyolefin content, which enhances the material's mechanical properties. This composition optimization allows for thinner strapping designs that maintain adequate closure strength through improved material performance rather than relying solely on increased thickness.
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 resulting plastic strapping exhibits improved temperature stability, increased tensile strength, and reduced relaxation behavior, enabling secure and efficient wrapping of objects at elevated temperatures with reduced material thickness and energy requirements.
Implementation Method 1
the fibrous material having a melting temperature above 300°C
Implementation Method 2
allowing for direct extrusion and enhanced molecular and fiber orientation
Implementation Method 3
enhanced molecular and fiber orientation for increased strength and stability
Data Source
AI summary
The present invention relates to a plastics-material strapping band (4) for wrapping around one or more articles. The plastics-material strapping band has the following constituent parts: a) up to approximately 90% by weight polyester, b) approximately 1% by weight to 5% by weight polyolefin and c) approximately 5% by weight to 10% by weight fiber material. The invention also relates to a method for producing a plastics-material strapping band.