Polyester Tape Composition Reduces Sticking and Twinning
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Solution Overview
Problem
The production of uniaxially-oriented PET tapes for weaving in standard circular or flat looms is hindered by the tendency of thin PET tapes to stick together and twin, and difficulties in winding them onto flangeless tubes, resulting in irregularly shaped bobbins that are challenging to feed into looms.
Innovation Solution
A tape comprising 75 wt% to 99.9 wt% thermoplastic polyester and 0.1 wt% to 25 wt% linear low-density polyethylene, which reduces sticking and twinning, allowing for continuous high-speed production of regular-shaped bobbins without voiding or breakage, maintaining good mechanical properties and optical qualities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If thin PET tapes are produced for weaving, then the tapes can be used in standard circular or flat looms, but the tapes tend to stick together and twin
Solution Approach 1:
The patent applies composite materials by combining PET (polyester) with polyolefin (such as polyethylene or polypropylene) to create a blended tape composition. This composite structure allows the tape to maintain the weaving suitability of PET while the polyolefin component reduces sticking and twinning tendencies, resolving the contradiction between adaptability for weaving and resistance to harmful sticking behaviors.
2Productivity
If thin PET tapes are produced at high speed, then productivity increases, but the tapes exhibit voiding and breakage
Solution Approach 1:
The composite PET-polyolefin structure provides both high productivity and reliability. The polyolefin component acts as a lubricant and stress distributor, preventing voiding and breakage even at high production speeds, while the PET provides the necessary tensile strength for weaving applications.
Solution Approach 2:
The patent utilizes parameter changes by adjusting the drawing ratio and heat setting conditions during the tape production process. By optimizing these parameters in conjunction with the composite material structure, the tape can be produced at high speeds without voiding or breakage, maintaining both productivity and reliability.
3Strength
If PET tapes are drawn at higher ratios, then the mechanical properties improve, but the tapes stick together and twin
Solution Approach 1:
The composite material structure enables higher drawing ratios without sticking or twinning. The polyolefin component reduces inter-tape friction and adhesion, allowing the PET to be drawn at higher ratios while maintaining mechanical properties and preventing the harmful sticking and twinning effects.
4Device complexity
If flangeless tubes are used for winding, then the production process is simplified, but irregularly shaped bobbins are produced
Solution Approach 1:
The patent applies parameter changes by adjusting winding tension, speed, and temperature conditions during the bobbin formation process. These parameter adjustments compensate for the simplified flangeless tube structure, ensuring regular-shaped bobbins are produced without increasing device complexity.
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 solution enables the production of PET tapes that can be drawn at higher ratios without sticking or twinning, resulting in bobbins with consistent shapes, suitable for weaving, and exhibits high tenacity, low shrinkage, and excellent optical properties like gloss and clarity, even at industrial production speeds.
Implementation Method 1
the LLDPE acts as a lubricant and anti-blocking agent during the drawing process, reducing friction and adhesion between the PET tapes
Implementation Method 2
A tape comprising 75 wt% to 99.9 wt% thermoplastic polyester and 0.1 wt% to 25 wt% linear low-density polyethylene
Implementation Method 3
the tapes are drawn in the machine direction through a heating cabinet and between drawing rollers to a draw ratio of 4.5:1 to 7.5:1
Implementation Method 4
the tapes are drawn in the machine direction through a heating cabinet and between drawing rollers
Implementation Method 5
extruding a composition comprising from i) about 75 wt% to about 99.9 wt% of a thermoplastic polyester; ii) from 0.1 wt% to about 25 wt% of a linear low-density polyethylene
Data Source
AI summary
The invention relates to a tape comprising from (i) about 75 wt% to about 99.9 wt% of a thermoplastic polyester, (ii) from about 0.1 wt% to about 25 wt% of a linear low-density polyethylene and (iii) from 0 wt% to about 5 wt% of other components, said tape having a thickness from 5μm to 300 μm and a width from 0.5mm to 7mm. This tape shows no twinning and sticking to other tapes after slitting, has very good mechanical properties. When the tape is wound, bobbins having a regular shape can be obtained.