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In observing the entire process of rotational molding, there are the following advantages compared to traditional blow molding and injection molding processes:
1. Cost advantage: The rotational molding process only requires the strength of the frame to support the weight of the materials, molds, and the frame itself, preventing material leakage due to insufficient clamping force. Additionally, during the entire molding process, the materials are almost unaffected by any external forces except for the effect of natural gravity, which provides significant convenience for mold processing and manufacturing, resulting in shorter cycles and lower costs.
2. Quality advantage: Products made through rotational molding experience no internal stress throughout the production process, leading to more stable product quality and structure.
3. Flexibility advantage: The manufacturing of molds for rotational molding is convenient and inexpensive, making it particularly suitable for small-batch production of diverse varieties in new product development.
4. Personalized design advantage: Products made through rotational molding can easily change colors and can be produced hollow (seamless and without welding). Surface treatments can achieve effects resembling patterns, wood, stone, and metal, meeting modern consumers' demands for personalized goods. Products produced using this process include fuel tanks, water tanks, mechanical housings, and mudguards. The main alternatives are metal parts and fiberglass products.
Plastic products, such as plastic basins, plastic boxes, and plastic chopsticks, are prevalent in our daily lives. Below we introduce the application fields of plastic water tanks, which are widely used in secondary water supply for high-rise buildings, water storage, water treatment, electronics, chemicals, textile dyeing, petrochemicals, acid pickling and plating, pharmaceuticals and food, brewing and sugar production, vegetable pickling, aquaculture, freezing and refrigeration, etc. The products are distributed across mainland China (all provinces and regions except Tibet), and the service life of water tank products can reach up to 25 years, with advantages such as resistance to scaling, making them suitable replacements for steel-lined rubber, plate welding, fiberglass, stainless steel, and clay tanks.
There are two types of container water tanks: plastic water tanks and stainless steel water tanks. Plastic water tanks can be divided into rotationally molded and blow-molded types, with the rotationally molded plastic water tanks produced using traditional methods. Today, we mainly introduce the classification of plastic water tanks:
1. Cylindrical shell water tank: Composed of a top cover, side wall, and bottom. The top cover can be a flat plate, a regular conical shell, or a spherical shell, with an upper ring beam set around the perimeter. The side wall is cylindrical. The outer extension of the bottom is an inverted conical shell, while the middle section uses a spherical shell. The dimensions of the outer extension are determined based on the near balance of horizontal forces between the two shell types.
2. Enclosed plastic containers should undergo vertical drop tests, stacking tests, air-tightness tests, and hydraulic tests. Installation handles and inseparable handle plastic containers require testing.
Plastic water tanks include plastic water towers, plastic containers, plastic round barrels, plastic square boxes, and other large plastic containers. Plastic water tanks are primarily made from new, specialized rotational molding materials of high-density polyethylene (HDPE). Regular HDPE materials are known for their environmental-friendliness, acid and alkali resistance, and tolerance to extreme temperatures. Plastic water tanks made from HDPE can achieve food-grade standards.