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Effect of Cooling and Granulating on the Quality of Woven Bag

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Effect of Cooling and Granulating on the Quality of Woven Bag

作者: Release Date: 2018-05-03 Author: Click:

The extruded strips are cooled with water to make woven bags . This kind of pelletizer is a slitting machine. It is a soft and hard cutting tool. It is sharp and rigid. It is suitable for cold pelletizing of a small amount of rigid plastic. Because of its simple structure. Fewer failures and low maintenance rates. It is still used by the majority of plastic pellet manufacturers. So, what are the benefits of this cold-cut pellets for woven bags in the future bag making process?
In the process of pelletizing, there must be no sloppyness. First, the water temperature of the cooling strip should not be too high: it should be low, and it is generally controlled at 50-70 ° C. The water temperature is too high: the hot strips from the lip of the extruder will not cool quickly, which will cause the particles to be brittle. Keeping it at a certain temperature is conducive to the volatilization of water vapor. Second, the particles are cut off. It is not advisable to pack it in a hurry, and it is to be air-dried: the air-tight packaging can be packed, and the particles should be dropped into a large woven bag (about 200 kg). Allow the water and other volatile hydrating substances remaining in the granules to be fully volatile. Then it is packed at the specified weight.
In this way, we can guarantee that we will not produce water vapor during the process of making flat yarn in woven bags, which can make the products made more flexible and quality guaranteed.
There are various reasons for the carbonization of the screw of the woven bag drawing machine. Once this situation occurs, the most direct consequence will affect the output of the silk, which will affect the production and sales of the woven bag. Then, we only have There is a clear understanding and analysis of the reasons for this, and we can better solve it; plastic woven bags
The raw materials of plastic woven bags, polypropylene and polyethylene, are both macromolecular compounds with a hydrocarbon structure. When heated above their "melting point" temperature, they will gradually decompose and carbonize. The "melting point" temperature of polypropylene is about 168 ° C, and the "melting point" temperature of polyethylene is about 143 ° C. Then the drawing machine's heating temperature for polypropylene sometimes reaches 260 ° C, which exceeds the "melting point" temperature, and it will not be carbonized during normal production. This is because the barrel temperature reaches 260 ° C, and the barrel wall passes to the forward-moving polymer. Propylene and flowing polypropylene only get a temperature slightly higher than 168 ° C. When the heat transfer temperature is high, the heating will stop, and when the heat transfer temperature is low, the heating will automatically start.
If polypropylene and polyethylene do not flow in the barrel, that is, when the screw stops rotating, the time is too long, and it is still at 260 ° C, and carbonization will gradually occur, resulting in the screw and barrel. Such carbides are generally firmly consolidated in the screw grooves of the melting section and the homogenizing section of the screw, as shown in the figure. The feeding section generally does not generate carbonization because the heating temperature is low and the material is loose. Even if the carbides will adhere to the barrel wall, they will be scraped off by the screw. plastic woven bag
The carbon deposits of the screw shown in the picture
Carbon build-up in the screw prevents the material from rolling and plasticizing normally in the compression section, and even hinders the extrusion channel, which reduces the amount of extrusion after a period of time after driving. Then the number and speed of yarns will be slowed down, and eventually the normal production and sales of woven bags will be impossible.


URL of this article: http://abssps.com/⎝⎛178电玩城⎞⎠/418.html

Keywords: plastic woven bag , plastic woven bag manufacturer

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