Copolyester Tape Tensile-Impact Strength Weaving Splitting
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Solution Overview
Problem
Polyester tapes used in weaving are prone to splitting due to their brittleness and high tensile-impact susceptibility, leading to uneven fabric quality and loom stoppages.
Innovation Solution
A copolyester tape composition with specific molecular weight ranges and glass transition temperatures, incorporating polymeric units derived from ethylene glycol and terephthalic acid, and optionally additional comonomers, to enhance tensile-impact strength and reduce fracture surface irregularities during weaving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyester tapes are used for weaving, then transparency, gloss, tenacity and high service temperature are achieved, but the tapes are prone to splitting due to brittleness and high tensile-impact susceptibility
Solution Approach 1:
The patent changes the chemical composition parameters of the polyester by incorporating comonomers (cyclic carbonate, cyclic carboxonate, or cyclic ester) with specific molecular weight ranges (500-5000 g/mol). This compositional parameter change modifies the polymer chain structure to reduce brittleness and improve tensile-impact strength, allowing the tape to withstand sudden pulls during weaving without splitting while maintaining the desired transparency, gloss, and heat resistance.
Solution Approach 2:
The patent creates a composite polyester structure by combining polymeric units from ethylene glycol and terephthalic acid with additional units from cyclic carbonate, cyclic carboxonate, or cyclic ester comonomers. This composite material approach integrates multiple polymer components at the molecular level, where the comonomer units act as flexible segments that reduce brittleness and prevent splinter formation during tensile impact, thereby improving reliability during weaving operations.
2Productivity
If polyester tapes are subjected to sudden pulls during weaving, then the loom operation continues, but the tapes fracture and produce splinters that clog guides and cause stoppages
Solution Approach 1:
The patent converts the inherent brittleness of polyester into a beneficial property by incorporating comonomers that control the fracture behavior. Instead of producing sharp splinters that clog guides, the modified polyester structure causes the material to deform and fail in a controlled manner that generates no harmful fragments. The comonomer units create a more ductile structure that absorbs impact energy without shattering, thus eliminating the harmful splintering effect while maintaining strength.
Solution Approach 2:
The patent modifies the molecular weight distribution and composition parameters of the polyester by incorporating cyclic carbonate, cyclic carboxonate, or cyclic ester comonomers with specific molecular weights (500-5000 g/mol). This parameter change alters the fracture surface characteristics from splinter-prone to smooth, preventing guide clogging and enabling continuous weaving operation without stoppages due to tape fragmentation.
3Reliability
If the tape composition is modified to improve tensile-impact strength, then splitting resistance increases, but the complexity of the copolymer synthesis increases
Solution Approach 1:
The patent achieves improved splitting resistance by carefully controlling the molecular weight range (500-5000 g/mol) and composition ratios of the comonomers in the copolymer synthesis. By optimizing these parameters, the patent balances the need for enhanced reliability with manageable synthesis complexity, ensuring that the copolymerization process remains industrially feasible while producing tapes with superior tensile-impact strength and reduced splitting tendency.
Data Source
AI summary
The present invention relates to a tape comprising a composition comprising a copolyester comprising polymeric units derived from ethylene glycol and terephthalic acid or a diester thereof and > 0.50 and < 5.00 wt% of polymeric units with regard to the total weight of the polyester derived from an oligomeric dihydroxy compound having a number average molecular weight of > 500 g/mol and < 5000 g/mol. Such tape has an improved tensile-impact strength and a reduced proneness to splitting during weaving.