Introduction to the firing of rotational molding machine products
Release time:
2021-08-17
1. Adjusting the speed ratio: Effectively utilizing gravitational and centripetal forces, it is known that in fitness exercises, the static powder always tends to settle at the bottom, and the speed ratio is at the midpoint when it is 8-9 revolutions per minute. Exceeding the midpoint results in thicker sides and a thinner middle, and conversely, thinner sides and a thicker middle. In general product manufacturing, the large frame of the rotational molding machine operates at 8.5 revolutions, while the small frame needs to increase the speed ratio, as the transmission ratio for each product is different. (This requires everyone to accumulate experience in their work.)
1. Adjusting the speed ratio: Effectively utilizing gravitational and centripetal forces, it is known that in fitness activities, electrostatic powder always tends to settle at the bottom, and the speed ratio is at the midpoint when it is 8-9 revolutions per minute. Exceeding the midpoint, the product is thicker on both sides and thinner in the middle; conversely, thinner on both sides and thicker in the middle. In general product manufacturing, the large frame of the rotational molding machine operates at 8.5 revolutions, while the small frame needs to increase the speed ratio, as the transmission ratio for each product is different. (This requires collective accumulation of work.)
2. Ignition and burning: The melting point of general electrostatic powder is between 110℃ and 140℃. Currently, the combustion chamber of the engine is large; in summer, a single flame takes about ten minutes to reach around 120℃, while in winter, it takes about thirty minutes to reach around 120℃. Now, using a double flame directly, it can reach 200℃ in ten minutes during summer. Once the temperature reaches 200℃, one of the flames should be turned off to allow the electrostatic powder to melt steadily in the furnace.
3. Product generation: When the temperature inside the mold reaches the melting point of the electrostatic powder, some of the electrostatic powder adheres to the core of the mold. Through the continuous rotation of the rotational molding machine, the electrostatic powder sticks layer by layer to the molten plastic until it is completely melted. This process takes 40 minutes. (This process is not visible.)
Note: If the temperature remains below 100℃, the electrostatic powder inside the rotational molding machine mold will always be electrostatic powder. When the temperature is controlled at 150℃, the electrostatic powder melts very slowly, and it takes more than an hour to complete one burning process. When the temperature is controlled at 220℃, it is the optimal temperature for burning. If it exceeds 220℃, the timing must be well managed; generally, it can be released after 35 minutes. Exceeding this time may damage the release agent, causing the product to stick to the mold, resulting in product damage and requiring mold repair.
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Website:www.rotomoldmachinery.com
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