Qingdao Sincere Machinery Co., Ltd

Why choose our company?

.gtr-container-x7y8z9 { font-family: Verdana, Helvetica, "Times New Roman", Arial, sans-serif; color: #333; line-height: 1.6; padding: 15px; max-width: 100%; box-sizing: border-box; } .gtr-container-x7y8z9 p { font-size: 14px; margin-bottom: 1em; text-align: left !important; line-height: 1.6; } .gtr-container-x7y8z9-section-title { font-size: 18px; font-weight: bold; color: #D64000; margin-top: 1.5em; margin-bottom: 1em; text-align: left; } .gtr-container-x7y8z9-product-list { list-style: none !important; padding-left: 20px; margin-bottom: 1.5em; } .gtr-container-x7y8z9-product-list li { position: relative !important; padding-left: 15px !important; margin-bottom: 0.5em !important; font-size: 14px !important; line-height: 1.6 !important; text-align: left !important; } .gtr-container-x7y8z9-product-list li::before { content: "•" !important; color: #D64000 !important; position: absolute !important; left: 0 !important; font-size: 1.2em !important; line-height: 1.6 !important; top: 0 !important; } .gtr-container-x7y8z9-call-to-action { font-size: 18px; font-weight: bold; color: #D64000; margin-top: 2em; text-align: center !important; } @media (min-width: 768px) { .gtr-container-x7y8z9 { padding: 30px; max-width: 960px; margin: 0 auto; } .gtr-container-x7y8z9-section-title { margin-top: 2em; margin-bottom: 1.2em; } .gtr-container-x7y8z9-call-to-action { margin-top: 3em; } } Qingdao Sincere Machinery Co.,Ltd is located in the beautiful coastal city Qingdao,our city owns Jiaodong International airport and multiple high-speed rail stations ,conventient transportation. Our company is a plastic machinery research and development ,design and manufacturing, production and operation and technical services as one of the high-tech enterprises. Our company is located in the beautiful city QingDao ,our city owns Jiaodong International airport and multiple high-speed rail stations,Convenient transportation .Our company is a plastic machinery research and development ,design and manufacturing,production and operation and technical services as one of the high-tech enterprise . Our main products are : structual wall spiral wound pipe extrusion line HDPE large diameter hollow wall spiral winding pipe production line Dn200mm-5000mm PE/PP-H spiral storage tank machine inner rib reinforced spiral pipe machine spiral corrugated pipe machine solid wall spiral pipe line pipe socket/spigot injection machine Continous Krah pipe line HDPE steel strap reinforced composite pipe equipment water and gas supply pipe extrusion line 16-1600 single/ double wall corrugated pipe line PPR/PER-T/PVC/EVOH pipe/hose line PE/PP/ABS/PC/PET/PVCplate extrusion line PVC/WPC profile line plastic recycling pelletizing line shredder crusher plastic round/square/rectangular tanks welding machine ang other auxiliary machinery. Varieties of products sold domestic and exported to Russia,Europe ,South America,SoutheastAsia, the Middle East,Africa and many other countries and regions Welcome to visit our factory and looking forward to win-win cooperation with you.

RUPLASTIC Russia

RUPLASTIC Russia 2026, the Russian Plastics Industry and Rubber Exhibition, will be held from January 27th to January 30th, 2026, at the Crocus International Exhibition Center, Mezhdunarodnaya Ulitsa, 16, Krasnogorsk, Moscow Oblast, 143401, Russia. The event is organized by EXPO FUSION LLC and takes place annually. The exhibition covers an area of 12,897 square meters and is expected to attract 35,900 visitors. There will be over 1,000 exhibitors and brands participating. ✅ Qingdao Sincere Machinery, 27D44, warmly welcome to our booth! WhatsApp/Telegram:+86-15763926137 ✅ RUPLASTICA 2026 for plastic and rubber industry⏰ Exhibition Dates: January 27–30, 2026

What is a "Kelaguan"?

"Kelaguan" (also known as an HDPE winding reinforced pipe) is a high-density polyethylene (HDPE) winding reinforced pipe manufactured using the hot winding molding process. It features high ring stiffness, excellent impact resistance, corrosion resistance, and a long service life. It is widely used in municipal drainage, industrial sewage discharge, agricultural irrigation, and other fields. The "Kelaguan" uses a socket-type electrofusion connection method, ensuring reliable connections, good sealing performance, and convenient construction. Its smooth inner wall results in low flow resistance and strong conveying capacity. Made of high-density polyethylene material, the "Kelaguan" offers good flexibility, allowing it to adapt to uneven ground settlement and demonstrating excellent seismic performance. Additionally, the "Kelaguan" is lightweight, easy to transport and install, and provides high overall cost-effectiveness, making it an ideal alternative to traditional concrete and cast iron pipes.

The "Underground Artery" of IConstruction Fields

Multi-Scenario Applications in Construction Engineering In the field of construction engineering, hollow-walled spiral wound pipes demonstrate extensive application value. They can be used in various scenarios such as building rainwater downpipes, underground drainage pipes, sewage pipes, and ventilation pipes. These pipes feature smooth inner and outer surfaces, connected by square spiral ribs between the walls, classifying them as flexible pipes. They offer good extensibility, strong pressure resistance, and high adaptability to uneven settlement, enhancing the seismic resistance and disaster mitigation capabilities of public utilities . When used as building rainwater pipes, the smooth inner wall of hollow-walled wound pipes provides superior drainage performance, allowing for rapid rainwater discharge and preventing water accumulation issues . In applications for underground drainage and sewage pipelines, the pipes exhibit excellent sealing performance. Connection technologies such as electro-fusion bands or heat-shrink bands enable fast construction, high connection quality, and great joint strength, achieving zero leakage at the joints and effectively preventing groundwater contamination from sewage seepage . In ventilation duct applications, hollow-walled wound pipes are lightweight and easy to install, weighing only about one-eighth of concrete pipes, which facilitates transportation and construction . The pipes can operate normally within a temperature range of -50°C to 60°C without freezing cracks or expansion leaks, offering wide adaptability and low constraints from seasonal or temperature variations during construction . Application Scenario Key Advantages Specific Characteristics Building Rainwater Pipes​ Efficient Drainage Smooth inner wall ensures rapid water flow, preventing accumulation . Underground Drainage/Sewage Pipes​ Zero Leakage Electro-fusion or heat-shrink band connections create a monolithic, leak-free interface . Ventilation Pipes​ Lightweight & Easy Installation Approximately 1/8 the weight of concrete pipes, enabling easier handling and potentially lower transport and installation costs . General Applicability​ Wide Temperature Resistance Suitable for use from -50°C to 60°C, resistant to freezing cracks and expansion leaks, allowing construction in varied climates . Connection Methods and Sealing:​ The predominant connection methods for these pipes in construction include electro-fusion band connection​ and heat-shrink band connection. These methods ensure the joint's material and structure are consistent with the pipe body itself, creating a robust, integral seal that is crucial for preventing leaks in drainage and sewage applications . This translation aims to be professional and accurate, adhering to technical documentation standards. Please feel free to ask if you require adjustments in style or have other requests.

The "Underground Artery" of Industrial

.gtr-container-a1b2c3d4 { font-family: Verdana, Helvetica, "Times New Roman", Arial, sans-serif; color: #333; padding: 15px; line-height: 1.6; font-size: 14px; box-sizing: border-box; } .gtr-container-a1b2c3d4 p { margin-bottom: 1em; text-align: left !important; font-size: 14px; } .gtr-container-a1b2c3d4 .gtr-heading { font-size: 18px; font-weight: bold; margin-top: 1.5em; margin-bottom: 1em; text-align: left; } @media (min-width: 768px) { .gtr-container-a1b2c3d4 { max-width: 960px; margin: 20px auto; padding: 25px; } } In urban underground pipeline networks, a type of pipe manufactured using advanced winding technology is quietly transforming the landscape of traditional drainage and sewage systems. Through its unique I-beam structural design and hot-melt winding technology, the hollow-walled spiral wound pipe production line offers a more environmentally friendly and efficient solution for modern industrial wastewater drainage and construction projects. Outstanding Performance in Industrial Wastewater Drainage In the industrial sector, the hollow-walled spiral wound pipe has become the material of choice for drainage pipelines in industries such as chemicals, hospitals, and environmental protection, thanks to its excellent corrosion resistance. Made from high-density polyethylene (HDPE), the pipe boasts strong resistance to corrosion and chemical erosion, requiring no anti-corrosion treatment when transporting corrosive fluids or being laid in highly corrosive soil. Its performance significantly surpasses that of traditional pipes . Industrial drainage pipes need to withstand the erosion of various corrosive media, where common pipes are prone to blockage, corrosion, and rupture. Due to their excellent corrosion resistance, resistance to acids, alkalis, and salt spray, hollow-walled spiral wound pipes can maintain long-term stable drainage function even in harsh environments . The Manning roughness coefficient Nof the pipe's inner wall is approximately 0.010. Consequently, the frictional resistance is low when conveying fluids, leading to a significantly higher flow capacity under the same conditions compared to concrete pipes

Why choose HDPE material for pipes?

Among various plastic materials, HDPE (High-Density Polyethylene) stands out as the ideal choice for hollow-wall spiral winding pipes due to its unique molecular structure and exceptional performance advantages. 1. Molecular Structural Advantages​ HDPE has a linear molecular chain with minimal branching, resulting in a tightly packed, highly ordered structure and a crystallinity rate of 80%–90%. This high-density structure gives it distinct properties compared to other polyethylenes like LDPE (Low-Density Polyethylene) or LLDPE (Linear Low-Density Polyethylene). In contrast, LDPE has long, irregular branches and a loose structure with lower density, while LLDPE features linear chains with short, evenly distributed branches. 2. Performance Advantages​ Strength and Rigidity: HDPE exhibits high strength and rigidity, capable of withstanding significant external forces without deformation or fracture. Its impact resistance is several times higher than that of ordinary plastics, and it maintains excellent toughness even at -40°C. In comparison, LDPE, though flexible and easy to process, has lower strength, rigidity, and heat resistance, making it prone to punctures. Chemical Corrosion Resistance: HDPE is highly resistant to most chemicals, including acids, alkalis, and salts (except strong oxidizing acids like concentrated nitric acid). This makes it a "corrosion-resistant expert" in industrial applications, requiring no additional anti-corrosion treatment when transporting corrosive fluids or installing in aggressive soils. Heat Resistance and Aging Resistance: HDPE has a melting point of 125–135°C and can withstand continuous use at 90–100°C. Typically black, it resists UV degradation during storage and construction, ensuring long-term durability. LDPE, however, degrades and discolors under sunlight or high temperatures. Processability and Environmental Sustainability: HDPE can be easily processed via injection molding, extrusion, blow molding, and welding. It is also recyclable (recycling code "02"), with recycled resin being repurposed for products like plastic pallets or outdoor furniture, aligning with circular economy principles. 3. Cost-Effectiveness​ HDPE hollow-wall spiral winding pipes are lighter than traditional pipes, reducing transportation and installation costs. They can be laid directly in trenches without concrete bedding, simplifying construction and shortening project timelines. Overall, they reduce comprehensive costs by up to 30% while offering a service life exceeding 50 years. 4. Market Prospects and Development Potential​ Governments around the world are introducing supportive policies, providing strong guarantees for the development of the HDPE pipe industry. The European Union's Industrial Strategy​ encourages the transition of the traditional plastics industry towards low-carbon and high-value-added directions, with specific emphasis on the application of HDPE in gas pipelines and chemical-resistant containers. The EU's Plastics Strategy​ explicitly requires that by 2030, all plastic packaging must be reusable or recyclable. As a representative recyclable material, HDPE holds significant policy advantages in the European market.

HDPE Hollow Wall Spiral Winding Pipe Production Line

As urbanization accelerates, a new type of pipe is quietly transforming the construction of underground urban pipelines. The HDPE hollow wall spiral winding pipe production line, as the core equipment for manufacturing this green building material, is gaining popularity in municipal engineering, industrial sewage disposal, agricultural irrigation, and other fields due to its unique technical advantages and environmental benefits. Innovative Technology, Excellent Quality The HDPE hollow wall spiral winding pipe production line adopts advanced winding technology to process high-density polyethylene (HDPE) raw materials into pipes with a hollow "I-beam" structure. The entire production process includes raw material preparation, extrusion melting, vacuum molding, cooling, winding, cutting, inspection, and other stages, each precisely controlled to ensure stable and reliable product quality . Raw Material Preparation and Feeding​ Automated feeders transport HDPE raw materials from storage tanks to the primary extruder. The feeding speed is automatically adjusted based on the extruder’s output, and the extruder’s rotation speed is set according to the product specifications. To enhance oxidation and UV resistance, color masterbatch is added at a ratio of 150:1 and mixed uniformly before being fed into the extruder . Extrusion Melting and Vacuum Molding​ During extrusion, the barrel temperature is set between 180°C and 220°C (adjustable based on material properties). The melted resin is then shaped into hollow rectangular profiles through a vacuum molding die at around 180°C before being transferred to the cooling stage . Cooling and Winding Molding​ Cooling involves two methods: spray cooling to reduce the profile surface temperature to approximately 50°C, and natural cooling during transfer. The cooled profiles are wound onto molds of specified diameters. Simultaneously, a secondary extruder (operating at 170°C–200°C) injects molten resin (260°C) to fuse the profiles spirally, forming a continuous pipe . Final Shaping and Inspection​ While the pipe is being wound and fused, spray water cools it to set the shape. An automatic cutting machine slices the pipe to predetermined lengths, and quality inspectors check dimensions (inner diameter, wall thickness, length), ring stiffness, and appearance against national standards. Qualified products are stored outdoors under protective covers to prevent UV damage . Superior Performance, Wide Applications HDPE hollow wall spiral winding pipes are lightweight, corrosion-resistant, and durable. Weighing only 1/8 of concrete pipes, they enable 50% faster installation. Their smooth inner surface reduces friction, increasing water flow capacity by 30%–50% compared to traditional pipes, allowing smaller diameters for equivalent flow rates and reducing project costs . Key Features​ Chemical Stability: Resistant to acids, alkalis, salts, wastewater, and soil corrosion . Impact Resistance: The "I-beam" structure provides flexibility and adaptability to various ground conditions . Aging Resistance: Designed to withstand UV exposure and maintain performance for over 50 years . Temperature Tolerance: Suitable for -50°C to 60°C environments without cracking or leakage . Lightweight: Easy to transport and install without heavy machinery . Leak-Free Joints: Electrofusion or thermal shrink bands ensure secure, seamless connections . Low Friction Coefficient: Inner wall roughness (N≈0.009–0.010) enhances flow efficiency . Applications​ These pipes are ideal for transporting fluids below 45°C in: Municipal Projects: Underground drainage and sewage systems . Road Engineering: Drainage for railways and highways . Industrial Use: Industrial wastewater pipelines . Construction: Building rainwater and ventilation pipes . Landfill Sites: Sewage collection pipes . Water Conservancy: Water supply and irrigation pipelines . Agriculture: Drainage for farmland, orchards, and forests . Telecommunications: Conduits for cables and optical fibers . Sports Fields: Drainage for golf courses and stadiums

Parameters of Waste Plastic PP PE HDPE LDPE Film Bag Recycle Pelletizing Machinery

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