Wow! This is how large capacity plastic storage tanks are manufactured.

In the process of covering molding for large-capacity plastic storage tanks using spiral winding叠加, polyethylene PE material is extruded through a heated extruder to form a melted paste-like strip. This strip is pressed against a heated roller, known as a millstone, under pressure. As the mold rotates and moves, the strip winds spirally on the mold, with the edge of the next strip overlapping the previous one. Under the action of the roller, the two strips melt together, forming a single, continuous layer. The thickness of a single layer can be controlled between 6-12mm, depending on processing parameters. When winding the next layer, the same method is applied, wrapping it around the tank body above. By adjusting the processing temperature and roller pressure between the two layers, they are fully melted together to form a cohesive structure. The thickness and number of layers are designed based on the tank's structural stress, with thicker sections for higher stress areas and thinner sections for lower stress areas. This allows for the production of cylindrical sections with a diameter of 3500mm and a single length of 6000mm.

Plastic storage tanks offer several advantages: 1. They have the same strength as extruded sheets and pipes, making them stronger than those made with rolled steel and焊接. 2. They are aesthetically pleasing, save on building materials, are lightweight, and cost-effective. 3. They can be processed into large-diameter, thick-walled pipes and cylinders. 4. They have excellent corrosion resistance. HDPE is a non-polar plastic with stable chemical properties, suitable for storing most chemical media, except for strong oxidizing acids (such as fuming sulfuric acid and concentrated sulfuric acid) and organic compounds that soften or swell it. 5. They have high heat resistance. PPH softens at 150°C, allowing for safe long-term use at 100°C. HDPE can be safely used for a long time at 60°C, with a softening point of 100°C. 6. They have good welding properties, and products made from the same material can be welded using various methods. The welding coefficient is high, ensuring good welding quality and a焊接 strength that is essentially the same as the base material's strength.