Monoaxially Stretched Polyester Adhesive Tape Resolving Shredding and Residue
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Solution Overview
Problem
Strapping adhesive tapes face challenges in maintaining high adhesion while being removable without residue, especially at low temperatures, due to high peel adhesion forces that can lead to shredding and adhesive residue, and existing carrier materials like monoaxially stretched polypropylene (MOPP) are prone to brittleness and fiber formation during processing.
Innovation Solution
A monoaxially oriented polyester film with a high weight percentage of polyethylene terephthalate, combined with a pressure-sensitive adhesive, is used to create an adhesive tape with enhanced tear propagation resistance, tensile strength, and residue-free removability, even at low temperatures, by optimizing the carrier material and adhesive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high peel adhesion forces are used to ensure reliable bonding, then adhesion strength is improved, but the risk of shredding and residue formation increases
Solution Approach 1:
The patent modifies the chemical composition parameters of the pressure-sensitive adhesive by incorporating specific functional groups (carboxylic acid, hydroxyl, amine) and adjusting the molecular weight distribution. This changes the adhesive's cohesive strength and bonding characteristics, enabling high adhesion while maintaining clean removal without shredding or residue.
Solution Approach 2:
The adhesive is formulated as a composite system combining polymer base materials with specific functional additives and modifiers. This composite structure provides both the necessary bonding strength and the controlled removal properties by balancing adhesive-cohesive forces through the synergistic interaction of different chemical components.
2Strength
If monoaxially stretched polypropylene (MOPP) is used as carrier material, then tensile strength is improved, but brittleness and fiber formation increase
Solution Approach 1:
The patent changes the material parameters by selecting polyester polymers with specific glass transition temperatures and molecular structures. This modification eliminates the brittleness inherent in polypropylene while maintaining the necessary tensile strength and dimensional stability for strapping applications.
Solution Approach 2:
The patent employs a flexible polyester film carrier with optimized thickness and orientation characteristics. This thin film structure provides the necessary mechanical strength while being sufficiently flexible to prevent fiber formation during processing and application, unlike the more rigid MOPP carriers.
3Reliability
If high adhesion forces are maintained across wide temperature ranges, then bonding reliability is improved, but removability without residue becomes difficult
Solution Approach 1:
The adhesive formulation incorporates dynamic molecular structures that can adapt their bonding characteristics based on temperature conditions. At application temperatures, the adhesive exhibits high bonding reliability, while at removal temperatures, the molecular mobility increases allowing clean detachment without residue, achieving temperature-dependent performance optimization.
Solution Approach 2:
The patent utilizes temperature-sensitive parameter changes in the adhesive's physical and chemical properties. The adhesive is designed with transition temperatures that allow it to maintain strong bonding in the service temperature range while becoming more easily removable at elevated temperatures without leaving residue on the substrate.
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 adhesive tape exhibits high tensile strength, resistance to tear propagation, and residue-free removability across a wide temperature range, reducing the risk of shredding and fiber formation, thus improving processing efficiency and product quality.
Implementation Method 1
an adhesive applied to at least one side
Data Source
AI summary
The invention relates to an adhesive tape comprising a backing consisting of a film, to at least one side of which backing an adhesive mass is applied. The film is a film that is monoxially stretched in the longitudinal direction and contains at least 90 wt. %, preferably 95 wt. %, more preferably 99 wt. % of polyester polymers.