The difference between blow molding and rotational molding
First of all, you need to have a concept of blow molding and rotomolding. In order to have a deeper understanding of the difference and characteristics of rotomolding and rotomolding.
What is blow molding?
Blow molding can also be called hollow blow molding. The raw material is a plastic parison formed by extrusion or injection. During the operation, the parison needs to be put into the split mold while it is still hot, and after the mold is closed, it is compressed in the parison. The air causes the plastic parison to expand and stick to the inner wall of the mold. After a period of cooling, the mold is released immediately to form various hollow blow molding products.
What is rotomolding?
Rotational molding, also known as rotational molding, rotational molding, rotary molding, etc., is a method of plastic hollow molding. The raw material is added to the mold, the mold is continuously rotated and heated along the two vertical axes, and the raw material in the mold is gradually and uniformly coated and melted and adhered to the entire surface of the mold cavity under the action of gravity and thermal energy, and then initially formed as The desired shape is cooled and shaped to form the corresponding rotomoulded product.
What are the characteristics of blow molding and rotational molding? Next, let's talk about the characteristics of blow molding and rotational molding.
Blow molding: (1) In blow molding, the parison is formed by the machine head under low pressure and blown under low pressure (mostly 0.2-1.0mpa), so the residual stress of the product is small, and it is resistant to stretching, The performance of various strains such as impact, bending and environment is high, and it has better performance. In injection molding, the melt must pass through the mold runner and gate under high pressure (15~140mpa), which will lead to uneven stress distribution. The relative molecular mass of blow molding plastic is much higher than that of injection plastic.
(2) The relative molecular mass of blow molding grade plastics is much higher than that of injection grade plastics.
(3) The blow molding machine occupies a small area, the structure is relatively simple, and it is easy to operate, and 3-5 people can operate the production of one machine. (The rotomolding machine occupies a large area and has a simple structure, but It is difficult to operate and requires a lot of labor)
Rotational molding: (1) Quality advantage: During the entire production process of rotomolded products, the product quality and structure are more stable due to the generation of no internal stress.
(2) The advantages of flexibility and change. The machine mold of the rotational molding process is easy to manufacture and cheap, so it is especially suitable for the production of multiple varieties and small batches in the development of new products.
Huayu IBC tank blow molding machine advantages
1.Production of 540 barrels, Huayu machine produces 540 less scraps per day than
its peers. The company was established in 2002 and has more than 18 years of technical experience. There are more than 600 Huayu blow molding machines in operation across the country and other countries around the world.
2.Focus on large blow molding machines and molds, with stable machine performance, high production efficiency, energy saving and environmental protection, and perfect after-sales service.
3.Leading technology, with more than 20 national patents for blow molding machines. The first to design and produce 4-layer, 5-layer and 6-layer large-scale hollow blow molding machines. Leading domestic and international technology.
4.The Die head is independently developed and designed, and has obtained national patents with stable performance.
5.The unique screw design can ensure that the plasticization of raw materials is fully uniform and efficient. With heating and water cooling device to ensure the stability of plasticizing temperature.
6.The clamping system adopts the design of double tie rods and three clamping cylinders, and the clamping is fast, stable and no noise.
7.The wall thickness controller adopts the world's most advanced MOOG wall thickness controller, with fast response speed and precise control. Display wall thickness change curve, easy and intuitive adjustment.
8.Using servo motor, low energy consumption, high efficiency and low noise.
9.The total power of the IBC tank blow molding machine is 433.5KW, and the normal operation of the machine consumes 180KW per hour. Daily electricity consumption: 180KW × 24 hours = 4320KW, the electricity fee is 0.8 yuan, and the daily electricity consumption fee: 4320KW × 0.8 = 3456 yuan.
Our company's ton barrel blow molding machine can produce 20-25 barrels per hour, an average of 540 barrels per day, and the electricity cost per barrel: 3456 yuan ÷ 540 = 6.4 yuan.
The blow molding machine in the same industry has 15 barrels per hour, and a maximum of 360 barrels per day. The electricity cost per barrel: 3456 yuan ÷ 360 = 9.6 yuan.
Therefore, for each barrel produced, Huayu equipment can save 9.6-6.4=3.2 yuan in electricity bills compared with equipment in the same industry. Saving electricity bills every day: 540×3.2=1728 yuan.
10.Huayu machine can control the weight of each barrel to 13.5kg,
11.Huayu blow molding machine scraps 4kg, scraps per barrel in the same industry is about 6kg, every 2kg=1080kg, the cost of scraps cut, cooled, crushed by workers is 0.8 yuan/kg, and the less scraps produced every day can save costs by 1080×0.8=864 yuan.
12.Huayu ton barrel blow molding machine adopts the design of double layer + anti-static coating, which is the first in China. Compared with adding anti-static raw materials to the color masterbatch in the same industry, this design uses less anti-static materials and has a more uniform distribution. . In this design, the anti-static material used in each barrel is only 500-800g plus the cost of 80 yuan per ton barrel, but the sales price of each barrel can be increased by 300-400 yuan.
In summary, the blow molding process has many advantages, and the advantages of the hollow blow molding machine using the blow molding process are beyond doubt. For more industry issues about hollow blow molding, please pay more attention to Huayu Plastic Machinery Co., Ltd.