Haixi Plastic Machinery-Manufacturer of anti-corrosion and insulation equipment

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3PE Pipeline Anti-corrosion Production Line

Three-layer polyethylene anticorrosion coating, also known as three-layer PE, is also called fused epoxy/extruded polyethylene structural anticorrosion coating. Its structure consists of three layers: the bottom layer is fused epoxy, the middle layer is usually an adhesive, and the surface layer is an extruded polyethylene anticorrosion layer. In the three-layer structure, the main function of the epoxy primer is to form a continuous coating that directly bonds with the steel pipe surface, exhibiting excellent adhesion. The middle layer is usually a copolymer adhesive, the main component of which is polyolefin; currently, vinyl copolymer adhesives are widely used. The polar functional groups of the copolymer adhesive can react with the epoxy groups of the epoxy primer to generate hydrogen bonds or chemical bonds, resulting in good bonding between the middle layer and the bottom layer; while the non-polar ethylene part has good affinity with the surface layer polyethylene. The three-layer polyethylene anticorrosion coating combines the excellent properties of epoxy coating and extruded polyethylene anticorrosion, combining the interfacial and chemical resistance properties of the epoxy coating with the mechanical protection properties of the extruded polyethylene anticorrosion layer, thereby significantly improving their respective performances.

Seamless Elbow Production Line

The extruder heats polyethylene granules to a molten state and uses a screw to push the raw material into the mold. Under continuous spiral thrust, the material passes through the mold and enters the elbow water jacket. The internal gas presses the material against the inner surface of the elbow water jacket. With the cooperation of the screw's spiral thrust and the external traction machine, the required specification elbow is pulled out. During the pulling process, the water jacket surface is water-cooled to allow for rapid shaping.

Vacuum Sizing Production Line

Working principle: PE granules are heated to a molten state and extruded through an extruder and die to form a preliminary tubular shape. The extruded pipe enters a vacuum sizing tank, where the vacuum suction causes the outer wall of the pipe to adhere tightly to the sizing sleeve, ensuring precise control of its outer diameter and shape. Simultaneously, the pipe is rapidly cooled by water cooling during sizing to set its shape and maintain stable dimensions. A traction machine pulls the pipe at a constant speed to ensure continuous production and effectively control the pipe wall thickness and diameter. When the pipe reaches the set length, a cutting machine cuts it into the required standard length.

Spray Winding Production Line

The spray-wrapped insulation pipe production line mainly consists of three parts: shot blasting and rust removal, polyurethane spraying, and PE wrapping production line. The polyurethane spraying forms a rough surface on the insulation layer, allowing the molten polyethylene outer layer to be pressed into the tiny recesses on the surface of the insulation layer, increasing the bonding force between the insulation layer and the outer layer, ensuring that the three main materials of the pipe—steel pipe, polyurethane, and polyethylene—form a firm and close "three-in-one" structure. It is a new type of automated equipment for manufacturing insulated pipe materials, mainly used in heating, petroleum, chemical, and other fields.

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ABOUT US

Qingdao Haixi Plastic Machinery Co., Ltd. is a high-tech enterprise specializing in the research and development, production, and sales of anti-corrosion and insulation equipment. The company was founded in 2005 and has a modern production base and advanced technology research and development center. It is committed to providing customers with efficient, environmentally friendly, and reliable plastic machinery solutions. Its products are widely used in various fields such as municipal engineering, petrochemicals, construction industry, and industrial pipelines.

2005

Company Establishment

700 +

Partner

10 Million

Registered Capital

HAIXI

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Industry Applications

The company always adheres to the concept of "survival based on quality, development based on reputation, innovation to increase efficiency, and image building based on culture".

Heat Supply Piping Network

China's largest professional production and export base for anti-corrosion and insulation equipment.

Water Conservancy & Electricity

China's largest professional production and export base for anti-corrosion and insulation equipment.

Water Conservancy & Electricity

China's largest professional production and export base for anti-corrosion and insulation equipment.

Petrochemical Industry

China's largest professional production and export base for anti-corrosion and insulation equipment.

Please contact our engineers !

All products are provided with three guarantees. Similar products are better than quality, and the same quality is better than price. We will sincerely serve every old customer and provide the most professional navigation for new customers.

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May 12,2026

Shipment initiated! PERT production line helps customers achieve efficient commissioning.

We will live up to your trust and deliver on our mission! Today, the high‑performance PERT pipe production line has been successfully dispatched and is en route to the site of Haicheng Shunfa Machinery Manufacturing Co., Ltd.

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Apr 30,2026

Expertly crafted and delivered on time! Rust-removal mixer equipment has been shipped.

The large-scale rust-removal machine and mixer were securely loaded onto the truck today and have officially departed for Ningxia Changhe Jiuying Industrial & Trading Co., Ltd.!

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Apr 30,2026

Vacuum sizing production line shipped—quality delivery ushers in a new chapter.

Today, the vacuum sizing production line was successfully shipped and will soon be delivered to Haicheng Shunfa Machinery Manufacturing Co., Ltd. As a critical piece of equipment for plastic pipe production, this line integrates cutting-edge technology with meticulous craftsmanship.

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