High Tensile PVC Coated Galvanized Iron Wire Stranded Crane Lifting Rope Steel Wire Rope Plastic Coated Iron Wire

Product Description:

Material Advantages:

Manufacturing Process:

The production process of this high-tensile-strength PVC-coated galvanized iron wire stranded crane rope is guided by the core principle of **"load-bearing safety"**. From base material processing to finished product inspection, it is designed around the three major requirements of "high strength", "breakage prevention", and "wear resistance", and is divided into five key stages.

### Stage 1: High-carbon iron wire base material pretreatment (laying the foundation for strength)

1. **Iron wire selection and drawing**: High-carbon iron wire rods such as Q235 or 65Mn are selected. Through multiple continuous drawing processes, the coarse iron wire is drawn into fine iron wires of uniform diameter, ensuring that each wire has basic tensile strength.

2. **Iron wire surface cleaning**: The drawn fine iron wire is degreased, pickled, and washed to thoroughly remove surface oil and oxide scale, preventing impurities from affecting the subsequent stranding and galvanizing effects.

3. **Iron wire annealing treatment**: The cleaned fine iron wire is sent to an annealing furnace, where it is heated at high temperature and then slowly cooled to reduce the hardness of the iron wire and increase its flexibility, preparing it to reduce the risk of breakage during subsequent stranding. ### Second Stage: Multi-Strand Wire Twisting (Building the Load-Bearing Framework)

1. **Pre-twisting of Strands:** Based on the final strength requirements of the suspension rope, multiple thin wires are twisted together at a specific lay length (e.g., right-hand twist, left-hand alternating twist) to form a strand. Each strand typically contains 7-19 thin wires, enhancing the stability of the single-strand structure.

2. **Total Rope Twisting and Shaping:** The pre-twisted strands (commonly 6 strands + 1 center rope structure) are then twisted a second time around the center rope using a large rope twisting machine to form a complete wire rope core. This step requires strict control of the twisting tension and speed to ensure the rope is uniform and free of looseness, guaranteeing overall tensile strength.

### Third Stage: Hot-Dip Galvanizing for Rust Prevention (Enhancing Durability)

1. **Role Core Acid Pickling and Activation:** The twisted wire rope core is acid-pickled again to remove the trace oxide layer generated during the twisting process, activating the rope core surface and facilitating zinc layer adhesion.

2. **Hot-dip galvanizing**: The activated rope core is immersed in molten zinc at approximately 450℃, resulting in a uniform zinc layer (typically ≥80μm thick) adhering to the surface. Compared to electro-galvanizing, hot-dip galvanizing produces a thicker layer with stronger adhesion, suitable for the high-wear scenarios of crane lifting ropes.

3. **Zinc layer cooling and passivation**: The galvanized rope core is rapidly cooled by air or water to prevent zinc layer dripping. Some products undergo additional passivation treatment, forming a protective film on the zinc layer surface to further enhance rust resistance.

### Fourth Stage: PVC Coating Extrusion Coating (Environmental Protection and Adaptability)

1. **Coating Material Formulation**: Industrial-grade PVC resin is mixed with abrasion-resistant agents, anti-aging agents, and color masterbatches (such as bright yellow or orange), and heated to 160-180℃ to melt into a uniform PVC melt, ensuring the coating possesses high toughness and weather resistance.

2. **Continuous Extrusion Coating:** The galvanized wire rope core is fed into an extruder at a constant speed. A specialized die tightly and evenly coats the core surface with molten PVC. The coating thickness is controlled between 0.5-2mm, ensuring no air bubbles or gaps.

3. **Cooling and Shaping & Traction:** The coated rope is immediately placed in a cold water tank for rapid cooling to solidify the PVC coating. It is then pulled at a constant speed by a traction machine to prevent stretching and deformation, ensuring a tight bond between the coating and the core.

### Fifth Stage: Finished Product Processing and Rigorous Inspection (Ensuring Safe Use)

1. **Fixed Length Cutting and End Treatment:** According to order requirements, the continuous rope is cut to specified lengths (e.g., 50 meters/roll, 100 meters/roll). Some products will have the ends pressed (e.g., with added lifting rings or buckles) for easy crane hooking.

2. **Comprehensive Performance Testing:**

- Appearance Inspection: Check that the PVC coating is smooth and free of scratches, and that the zinc layer is not exposed or peeling off.

- Strength Testing: Samples are subjected to breaking tensile strength tests to ensure the tensile strength meets crane lifting load standards (e.g., ≥1670MPa).

- Weathering Testing: Rust resistance is verified through salt spray testing (≥48 hours), and the PVC coating toughness is verified through low-temperature impact testing.

3. **Packaging and Labeling**: Inspected and qualified finished products are wrapped in wear-resistant plastic film, labeled with product specifications, tensile strength, length, production date, etc., and then stored for shipment.

Features:

This high-tensile-strength PVC-coated galvanized iron wire stranded crane lifting rope is designed around two core requirements: **safe load-bearing capacity and durability**. It is adaptable to multiple scenarios and is a cost-effective choice for industrial lifting applications.

### 1. High Tensile Strength to Meet Lifting Load Requirements

- Utilizing a high-carbon iron wire (such as Q235 or 65Mn) stranded core, the multi-strand twisted structure distributes stress, significantly improving overall tensile and impact resistance. It can stably support heavy objects during crane lifting operations, avoiding the risk of breakage under heavy loads.

- The finished product undergoes rigorous breaking tensile strength testing (typically ≥1670MPa), and its strength indicators meet industrial lifting safety standards, making it suitable for the routine lifting needs of small and medium-sized cranes.

### 2. Double-Layer Rust Protection, Extended Service Life

- The middle layer, hot-dip galvanized, forms a thick zinc layer (≥80μm), effectively blocking air and moisture from contacting the wire, reducing rust at its source. The outer PVC coating further isolates rainwater, oil, dust, and other corrosive media, forming a double rust-proof barrier of "zinc layer + PVC".

- Even in complex environments such as humid outdoor conditions or oily industrial workshops, it reduces the rust rate, extending service life by more than 30% compared to ordinary wire ropes.

### 3. Multiple Protections with PVC Coating, Suitable for Complex Scenarios

- The coating has high abrasion resistance, buffering friction between the rope and heavy objects or crane components, preventing rope wear and scratches on the surface of heavy objects, while reducing friction noise during use.

- Industrial-grade PVC material with added anti-aging agents can withstand temperatures ranging from -20℃ to 60℃, resists UV aging, and is suitable for various indoor and outdoor lifting environments; the coating color is also highly visible (e.g., yellow, orange), making it easy to identify the rope position during operation and improving operational safety. ### 4. Flexible Structure and Convenient Operation

- The high-carbon iron wire undergoes annealing to enhance its flexibility. The multi-strand twisted design further strengthens the rope's bending performance, allowing it to flexibly adapt to crane lifting, turning, and lowering operations, avoiding operational inconvenience caused by stiffness.

- The rope surface is smooth (PVC coating), free of sharp burrs, facilitating handling and hooking by operators, reducing the risk of hand injuries during use.

Technical Parameters:

Applications:

This high-tensile-strength PVC-coated galvanized iron wire rope crane sling is ideal for small and medium-sized industrial lifting and related auxiliary applications due to its combination of **load-bearing capacity, rust resistance, and adaptability to various scenarios**. Specifically, it can be divided into four categories:

### 1. Industrial Workshop Equipment Lifting and Handling

- Suitable Scenarios: Installation, relocation, and maintenance lifting of small and medium-sized equipment (such as machine tools, motors, and water pumps) in factory workshops; loading and unloading of production line components (such as heavy gears and conveyor rollers).

- Reasons for Suitable Application: High tensile strength ensures stable support of equipment weight; the PVC coating prevents the rope from scratching the equipment surface; and the galvanized layer resists corrosion from oil and coolant in the workshop.

### 2. Warehousing and Logistics Loading and Unloading Operations

- Suitable Scenarios: Crane loading and unloading of palletized goods (such as bagged raw materials and boxed finished products) in warehouses; short-distance lifting and transfer of small and medium-sized containers (or semi-trailer goods) in logistics freight stations; installation and adjustment of frozen products and heavy-duty shelves in cold storage.

- Reasons for suitability: The rope is flexible, facilitating hooking operations; the PVC coating is resistant to low temperatures (-20℃), suitable for cold storage environments; the double rust-proof design can withstand the effects of moisture in humid storage areas or during open-air loading and unloading.

### 3. Auxiliary hoisting in building and municipal engineering

- Suitable scenarios: Hoisting of door and window frames and small prefabricated components (such as cement boards and steel pipes) in low-rise building construction; temporary hoisting of heavy tools (such as crushers and street light poles) in municipal engineering (such as road repair and street light installation); short-distance transportation of construction site materials (such as steel bar bundles and sand and gravel hoppers).

- Reasons for suitability: High tensile strength meets the load-bearing requirements of building materials; the PVC coating has a bright color (such as yellow), improving visual safety during outdoor operations; the galvanized layer resists corrosion from rain and dust at construction sites.

### 4. Heavy-Duty Operations in Agriculture and Livestock

- Suitable Scenarios: Repair and hoisting of large agricultural machinery (such as tractor parts, silage tanks) on farms; installation and relocation of heavy-duty fences and livestock equipment (such as large feed mixers) in livestock farms; installation of heavy-duty harvesting platforms and irrigation pipelines in orchards.

- Reasons for Suitable Application: Strong weather resistance, adaptable to the wind and sun environment of outdoor farmland and pastures; wear-resistant PVC coating, resisting friction from crop straw and soil, extending service life.

Support and Services:

We are passionate about providing our customers with sincere and timely service and building sustainable business relationships. 100% factory inspected, and we are responsible for any problems arising during the warranty period.

• We welcome your feedback upon receiving the goods.

• We can provide installation guides, and we can offer global service if needed.

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Start your worry-free choice for your maritime business with our marine steel wire ropes. Our ropes feature advanced craftsmanship and excellent quality, capable of withstanding rigorous tests. Coupled with professional technical support and considerate after-sales service, we will provide solid guarantees for your business throughout the whole process.

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