What Product Defects Will Be Caused by Excessive or Insufficient Tension in the Continuous Production of PTFE High-Temperature Cloth?

Jiangsu Aokai New Materials, a professional manufacturer of PTFE high-temperature cloth, shares professional insights for you. In the continuous production of PTFE high-temperature cloth, tension control is the core process parameter to guarantee its final quality. Improper tension control on the production line will directly trigger a variety of critical defects of finished products. The ideal operating tension of PTFE high-temperature cloth must be strictly controlled within a narrow range; any deviation will lead to a sharp rise in the defective rate.

The base material of PTFE high-temperature cloth is fiberglass cloth with high brittleness. Excessive tension will easily damage its internal structure, with specific problems as follows:

Fiber breakage and surface fuzzingExcessive tension will snap the internal fiberglass filaments, resulting in a large number of fuzz and invisible micro-cracks on the cloth surface. Such microscopic damage will seriously reduce the overall tensile strength of PTFE high-temperature cloth.

Uneven tightness of the cloth surfaceWhen the cloth is rewound under over-stretched conditions, it will form wavy irregularities after stress release, accompanied by obvious warp shrinkage ripples. In subsequent demolding applications, it cannot fit closely with molds.

Severer web deviationWeb deviation is mostly caused by mechanical precision errors, yet excessive tension will make the cloth wrap tightly around guide rollers. It becomes more sensitive to minor parallelism errors of equipment, thus aggravating lateral deviation.

If the tension is set too low, the cloth cannot be effectively restrained on the coating line, which severely impairs the uniformity of the PTFE coating.

Uneven coating and vertical streaksInsufficient tension leads to loose cloth surfaces. During PTFE emulsion impregnation or blade coating, the fabric cannot maintain uniform pressure contact with the scraper. This causes wavy variation in coating thickness and visible vertical streaks, resulting in partial failure of non-stick performance.

Rewinding wrinkles and creasesLoose feeding caused by inadequate tension easily forms indentations and wrinkles on the rewinding roller. Wrinkles generated before sintering will be permanently fixed after high-temperature sintering and shaping, resulting in the scrapping of the entire roll of cloth.

Structural distortionIn a relaxed state, warp yarns lack effective restriction, easily causing skew weft and mesh deformation, and damaging the width stability of PTFE high-temperature cloth.

In conclusion, the continuous production of PTFE high-temperature cloth must adopt a closed-loop tension control system to ensure high-precision and uniform tension. Only by reducing tension fluctuation in the width direction can manufacturers produce high-quality PTFE high-temperature cloth with a flat surface, uniform coating and stable mechanical strength.

The above content is provided by Jiangsu Aokai New Material Technology Co., Ltd.

We supply a full range of products, including PTFE high-temperature cloth, PTFE high-temperature tape, PTFE high-temperature mesh belt, seamless fusing machine belt, single-sided PTFE coated cloth, high-temperature resistant conveyor belt and high-temperature resistant fiberglass cloth. For detailed parameters, application solutions and customized services, please feel free to contact us:

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