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13905809167

Wang Jiaming (Manager)

Phone:
0580-8231369
Phone:
13905809167
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0580-8233517
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Features and characteristics of plastic screw barrel

Read: 2472 Published: 7/20/2015

Plastic screw barrel structure
① Material: 38CrMoALA, nitriding treatment, surface hardness: HRC 55 ° -58 °, nitride layer depth: 0.5-0.8mm
② Material: 38CrMoALA base material. The surface of the spiral edges and corners is made of double alloy imported alloy steel. After special treatment, it can effectively improve the wear resistance of the barrel screw and increase the service life.
Plastic screw barrel characteristics
The hopper is a component that stores plastic raw materials, and some add a heating and blowing device to the hopper to make a dry hopper. The shape of the hopper is generally the lower circle
Conical and upper cylindrical. Conical taper slope is for plastic parts with different particle sizes, different particle shapes, and different coefficients of friction and adhesion between particles.
There are different good values, otherwise the storage capacity of the hopper will be wasted or there will be a "bridge" or "funnel into a pipe" phenomenon with poor or no feeding.
The cause of the "bridge" phenomenon is because the plastic particles form an open bridge that can support the material above it at the small conical mouth.
And recycled materials with irregular shapes are more likely to occur. "Funnel into a tube" is because the particles flowing down are not enough to pull their adjacent particles to flow together.
Occurs when the plastic particle size is small. The general solution is to install a vibration device on the hopper or reduce the cone slope. If heat is transferred from the barrel to the feed
The bucket makes the temperature of the hopper too high, and the surface of the plastic pellets softens or sticks into agglomerates, which is more likely to form a "bridge" or block.
Plastic screw barrel characteristics
1. Select the screw that is more suitable for the plastic used, so that the plastic achieves a better mixed melt glue state. Plastic suppliers can be requested to provide appropriate plastic characteristics information, and professional screw manufacturers can design appropriate screw parameters to avoid plastic overheating and decomposition. The injection amount should generally be maintained at 20 ~ 80% of the machine specifications. For temperature-sensitive materials, use a narrower temperature range. Check the scratches or tooth marks on the surface of the barrel / screw to avoid plastic accumulation and overheating or burning. Check the solid heater or controller for failure to avoid overheating the plastic. The mold flow analysis software for plastic injection molding can assist the mold in selecting the appropriate injection molding machine. In this way, the plastic can be prevented from staying in the barrel for too long.
2. Adjust the molding conditions: If the temperature of the barrel and the nozzle is too high, the plastic in the barrel may overheat and cause decomposition, which can reduce the barrel temperature and the nozzle temperature. In addition, back pressure, screw speed, injection speed or injection pressure can be reduced to avoid decomposition due to too high shear heat.

Zhoushan Jiaming Machinery Co., Ltd. Main Products: Zhoushan Screw, Rubber Extruder Screw Barrel, Injection Mold Screw Barrel Address: No. 24 Dafeng Road, Xiqiao Industrial Zone, Jintang Town, Dinghai District, Zhoushan City, Zhejiang Province 0580-8231369 Mobile: 13905809167 Fax: 0580-8233517
Design and production of plastic machinery nets, ripping without permission will be investigated. Copyright (C) http://siamtlr.com , All rights reserved.

The above information is provided by the enterprise itself, and the authenticity, accuracy and legality of the information content are the responsibility of the relevant enterprise. Plastic Machinery Network does not assume any responsibility for this.
Tips: In order to avoid purchasing risks, it is recommended that you confirm the supplier's qualification and product quality before purchasing the product.

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