Polyethylene terephthalate (PTT) elastic yarn testingHow to apply for a report? What items need to be tested? We will conduct testing and evaluation in strict accordance with the standards. We can also provide personalized testing plans and reports according to your needs.

A Brief History of Development

In the early stage, propylene polymerization could only obtain paper-based products with low degree of polymerization, which belonged to amorphous compounds and had no practical value. In 1954, Ziegler and Natta invented the Ziegler Natta catalyst and made crystalline polypropylene with high stereoregularity, known as isotactic polypropylene or isotactic polypropylene. This research achievement has opened up new directions in the field of polymerization, laying the foundation for the large-scale industrial production of polypropylene and its widespread application in plastic products and fiber production In 1957, the Italian company Montecatini first achieved industrial production of polypropylene. From 1958 to 1960, the company used polypropylene for fiber production and developed a polypropylene fiber called Meraklon, which was later produced in the United States and Canada After 1964, polypropylene film cracking fibers for bundling were developed, and products such as textile fibers and carpet yarns were made from the original fiber of the film In the 1970s, the short range spinning process and equipment improved the production process of polypropylene fibers. During the same period, bulky continuous filaments began to be used in the carpet industry. Currently, 90% of carpet substrates and 25% of carpet veils worldwide are made of polypropylene fibers After 1980, with the development of polypropylene and new technologies for manufacturing polypropylene fibers, especially the invention of metallocene catalysts, the quality of polypropylene resin has been significantly improved. Due to the improvement of its stereoregularity (up to 99.5% isotacticity), the internal quality of polypropylene fibers has been greatly improved. In the mid-1980s, polypropylene fine fibers replaced some cotton fibers for use in textile fabrics and non-woven fabrics. With the development of one-step BCF spinning machines, air texturing machines, and composite spinning machines, as well as the emergence and rapid development of non-woven fabrics, the use of polypropylene fibers in decoration and industrial applications has further expanded. In addition, research and development of polypropylene fibers are also quite active in various countries around the world. The popularization and improvement of differentiated fiber production technology have greatly expanded the application field of polypropylene fibers

Performance characteristics

(1) Lightweight

Polypropylene fiber has a density of 0.90-0.92 g/cm3, which is the lightest among all chemical fibers, 20% lighter than nylon, 30% lighter than polyester, and 40% lighter than viscose fiber. Therefore, it is very suitable for use as a filler for winter clothing or as a fabric for skiing, hiking, and other clothing

(2) High strength, good elasticity, wear resistance, and corrosion resistance

Polypropylene fiber has high strength (the same in both dry and wet states), making it an ideal material for manufacturing fishing nets and cables; Good wear resistance and resilience, similar in strength to polyester and nylon, with a rebound rate comparable to nylon and wool, much higher than polyester and viscose fibers; Polypropylene has poor dimensional stability, is prone to pilling and deformation, is resistant to microorganisms, and is not moth prone; Chemical resistance is superior to general fibers

(3) It has electrical insulation and warmth retention

Polypropylene fiber has a high electrical resistivity (7 × 1019 Ω. cm), with a low thermal conductivity, polypropylene fiber has the best electrical insulation and warmth retention compared to other chemical fibers, but is prone to generating static electricity during processing

(4) Poor heat and aging resistance

Polypropylene fibers have a low melting point (165-173 ℃) and poor stability to light and heat. Therefore, polypropylene fibers have poor heat and aging resistance and are not resistant to ironing.

(5) Poor hygroscopicity and dyeing properties

Polypropylene fibers have the worst hygroscopicity and dyeing properties among chemical fibers, with almost no hygroscopicity and a moisture regain of less than 0.03%.

Test report function

1、Project bidding: issue authoritative third-party CMA/CNAS qualification report；

2、E-commerce platform entry: quality inspection reports recognized by major e-commerce platforms；

3、Used as sales report: issuing a test report with legal effect to make consumers feel more at ease；

4、Papers and scientific research: providing professional and personalized testing needs；

5、Judicial services: providing scientific, fair and accurate testing data；

6、Industrial problem diagnosis: verifying the troubleshooting and correction of problems in industrial production；