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As an indispensable and important tool in modern industrial handling, lifting and transportation, polyester slings are widely used in machinery manufacturing, logistics transportation, construction and other fields due to their lightness, flexibility and strong load-bearing capacity. However, there are many brands of polyester slings on the market, and the product quality is uneven. How to identify a high-quality polyester sling and ensure safe use is a problem of great concern to the majority of purchasers and users.

This article will introduce in detail how to scientifically and effectively identify the quality of polyester slings from multiple angles such as the material, manufacturing process, load-bearing performance, safety standards and actual use testing of polyester slings, helping you make a wise choice and ensure production safety.

1. The basic structure and material of polyester slings

Polyester slings are mainly woven from polyester fibers. Polyester fibers have high strength, good wear resistance and UV resistance, and are not easy to absorb water and have good corrosion resistance. These natural advantages provide a solid load-bearing foundation for slings.

High-quality polyester slings usually use high-quality polyester filaments as raw materials, with uniform fiber diameter and reasonable yarn twist, which ensures the strength and durability of the slings. On the contrary, inferior slings may use short fiber blends or recycled polyester fibers, resulting in insufficient sling strength and easy breakage.

How to identify the material?

Feel and appearance: high-quality polyester slings feel delicate and smooth, with uniform color; inferior products often feel rough and have obvious color difference.

Fiber strength test: The fiber strength is tested by professional equipment, and the strength of high-quality fibers is significantly higher than that of ordinary products.

Smell: Inferior polyester fibers are sometimes accompanied by pungent chemical smells, while high-quality products have no odor or slight odor.

2. The importance of manufacturing process

The manufacturing process directly affects the overall performance of polyester slings. Common manufacturing processes include:

Weaving density and width

The higher the weaving density, the better the overall strength and wear resistance of the sling. High-quality polyester slings are woven evenly without broken threads, and the width dimension tolerance is small.

Sewing process

The joint part of the sling carries great power. High-quality slings use multiple stitches and are stitched neatly without broken threads or loose threads. The stitching line uses high-strength polyester thread, and the sewing pattern is reasonable (such as "box-shaped" sewing method) to enhance the connection firmness.

Heat treatment process

Some polyester slings will undergo heat setting treatment to improve the stability and deformation resistance of the fiber and reduce relaxation during use.

How to identify the manufacturing process?

Visual inspection of fabric density: Observe the tightness of the fibers on the surface of the sling. The dense ones without obvious fiber protrusion are better.

Check the stitching line: The products with neat stitching, clean thread ends and high stitching density are of better quality.

Tensile test: The tensile strength of the seam is the key point. Manual or machine tensile tests can find joint strength defects.

3. Load-bearing performance test

The core function of polyester slings is load-bearing, and its load-bearing performance directly determines the safety of use. Qualified polyester slings must meet the rated load (WLL, Working Load Limit) and breaking strength requirements of national or industry standards.

The main parameters include:

Rated load (WLL): The maximum safe load allowed for the sling, usually 1/5 or 1/7 of the breaking strength.

Breaking strength: the maximum tensile force that the sling can withstand when it breaks. The higher the tensile force, the better the strength of the sling.

Safety factor: The standard generally requires a safety factor of ≥5.

How to identify the load-bearing performance?

Check the product logo: Regular manufacturers will mark the load-bearing capacity, specification model, production batch number and implementation standard on the sling.

Third-party test report: When purchasing, it is required to check the quality inspection certificate of the sling, such as ISO, CE certification or national standard test report.

On-site tensile test: Sampling tensile test is performed on the purchased batch to ensure that the load-bearing parameters of the sling meet the nominal value.

4. Safety standards and certification

High-quality polyester slings must comply with relevant domestic and foreign safety standards, such as:

Chinese standard: GB/T 22839 "Synthetic Fiber Sling"

European standard: EN 1492-1

American standard: ASME B30.9

In addition, the product should be tested and certified by a third-party certification body and have a quality certificate and compliance certificate.

How to identify standard compliance?

Check the certification mark: The sling packaging and the sling body should be printed with the certification mark and the implementation standard number.

Check the certification certificate: Verify the authenticity of the certificate through the official website of the certification body.

Pay attention to the reputation of the manufacturer: Choose a manufacturer and supplier with formal qualifications and good industry reputation.

5. Quality identification skills in actual use

In actual use, users can identify the quality of polyester slings by the following methods:

Visual inspection

Observe whether the surface of the sling is worn, cut, cracked, debonded or discolored. High-quality slings are generally smooth and have no obvious defects.

Hand feel test

Pinch the sling with your hand to check whether it is flexible and elastic. Poor-quality slings will feel hard and brittle or the fibers are loose.

Odor identification

New slings should have no pungent chemical smell. If there is an abnormal smell, it may contain inferior chemical additives.

Mark verification

Confirm whether the load-bearing capacity and specification markings on the sling are clear and complete to prevent counterfeit products.

Trial experience

Perform a simple load test within a safe range to observe whether the sling has abnormal deformation, slippage or suture shedding.

6. Maintenance and care of polyester slings

Maintaining the sling in good condition is the key to ensuring safety:

Avoid contact between the sling and sharp objects to prevent cuts.

Avoid high temperature, open flames and chemical corrosion environments.

Clean it immediately after use to avoid mud, sand and oil stains.

Check the condition of the sling regularly and replace it in time if it is damaged.

Identifying the quality of polyester slings is not a single link, but covers multiple dimensions such as material selection, manufacturing process, load-bearing capacity testing and use and maintenance. When purchasing, you should give priority to reputable and certified regular manufacturers, carefully check the appearance, stitching and logo of the sling, and pay attention to the compliance of the test report and safety standards. During use, adhere to scientific testing and maintenance methods to maximize the safety performance and service life of the sling.

High-quality polyester slings can not only effectively carry weight, but also ensure the safety of operators and equipment and avoid accidents. It is an important link that cannot be ignored in industrial safety.

If you need to purchase high-quality polyester slings, please contact us. We provide professional consulting and customized services to ensure that every lifting and handling of yours is safe and reliable.

http://www.reliablesling.com
Zhangjiagang Reliable Co.,Ltd

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