Analysis of defects in modified plastics and solutions

The main production equipment of modified plastics is twin-screw extruder. The common production process is: batching, mixing, and extruding. Appearance defects are a quality problem of modified plastic products, mostly related to production processes, raw material quality, production equipment, production environment and other factors. Common strips, granules, black spots, discoloration, poor vacuum, iron filings, poor plasticization, carbonization, etc.

1, long strip

A length greater than 2 times larger than normal particles is considered to be a long strip. The main reasons are the starting strip or broken strip, the direction of the strip is not straight, the granulator is worn or notched.

solution:

A. Adjust the direction of the strip entering the pelletizer and adjust the length of the water during normal production;

B. During the production, the broken strips need to be tempered;

C. Pay attention to the inspection of the apricots of the pelletized motorized knife and replace the damaged moving knife in time;

D. For the long strips that appear, a suitable vibrating screen should be used and sieved.

2, even grain

Two or more particles joined together side by side as a granule. The main causes are broken bars and insufficient length of water.

solution:

A. When the strip is extruded, a strip of the appropriate width is used to separate the strips that are connected together;

B. Adjust the appropriate cooling water length, that is, reduce the granules;

C. For the occurrence of continuous granules, sieves can be sieved with a suitable sieve.

3, black spots

There are black speckle particles on or in the surface of the particle. The main causes of black spots are: clean machine is not clean; black spots in raw materials; screw carbonization: environmental pollution.

solution:

A. During the process of switching to the machine, it is not cleaned up and re-cleaned;

B. Strengthen the incoming material inspection, especially in the filling of mineral powder or flame retardant, it is more likely to appear black spots and impurities;

C. Pay attention to control the temperature of the screw barrel and the residence time of the material in the barrel to prevent the processing temperature from being too high;

D. Pay attention to the surrounding environmental sanitation, it is necessary to do the isolation and protection between the production of different color products.

4, discoloration

It is manifested that the color of the product changes suddenly during the production process, and there is a significant color difference. The main cause of discoloration is uneven mixing; the cleaning machine is not clean; the temperature is too high; the shearing is too strong.

solution:

A. Strictly follow the mixing process to ensure the uniformity of the mixture;

B. After the completion of the cleaning machine, check the annual inspection to ensure that the cleaning machine is clean;

C. Control the extrusion temperature to prevent the toner from decomposing due to excessive temperature;

D. Choose the right combination of screws to avoid too strong shear.

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