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Changshu smoothly da plastic products factory to talk about the eight methods of ABS plastic pipe crack prevention
by：CSSSLD
2021-01-23
With the rapid development of society, plastic pipe material gradually replaced the metal pipe and ceramic pipes, become businessmen favorite!
Plastic pipe material craze has become a plastic tubing problem!
ABS plastic pipe cracking is out it in for processing a common phenomenon in the process, to reduce stress cracking phenomenon, we need to reduce internal stress.
With smooth da plastic products factory in changshu now to look at reducing the eight methods of ABS plastic pipe cracking.
1, the mold temperature. Ascend mold temperature can drop internal stress, processing mold temperature can be controlled in 80 - PC time 110 degrees Celsius, high internal stress is small.
2, processing temperature. Improve the processing temperature can reduce internal stress. PC when machining temperature can be controlled in 260 - 330 degrees Celsius, high internal stress is small.
3, injection pressure. PC material of high viscosity, and seems to require high pressure, high pressure will greatly increase the internal stress, with high pressure here. The appropriate pressure in 800 - in this case Between 1200 kg.
4, injection speed. Rof increases the existence of internal stress, low internal stress situations injection speed should not be high. In this case, the injection speed should be in the 50 - 70%, is 45 - for normal injection molding machine 60 millimeters per second.
5, the holding time. Long pressure maintaining time can increase the internal stress, in this case, the holding time should be within 2 - 3 seconds.
6, melt velocity. This is a relatively easy to be ignored indicators, melt velocity have what use? Useful, in this case, melt velocity is too high can cause excessive tearing lower molecular weight molecular chain, thus to reduce the impact strength and modulus, the appropriate product cracking. The melt velocity should be controlled here - in 400 450 mm per second.
7, annealing treatment. This case to reduce internal stress, annealing treatment is necessary, the parameters of the annealing is 85 - Time 1-100 degrees 2 hours, the annealing time should be conducted as soon as possible after forming.
8, mold design. This case the product is split in the corner, R is small. The place where we know R small easy to produce stress concentration, it is necessary for us to all thickness, large R design, in this case the Chinese and foreign R 2. 5 - Between 3 mm and R should be in 1. 5 - Between the 2 mm.
1, the mold temperature. Ascend mold temperature can drop internal stress, processing mold temperature can be controlled in 80 - PC time 110 degrees Celsius, high internal stress is small.
2, processing temperature. Improve the processing temperature can reduce internal stress. PC when machining temperature can be controlled in 260 - 330 degrees Celsius, high internal stress is small.
3, injection pressure. PC material of high viscosity, and seems to require high pressure, high pressure will greatly increase the internal stress, with high pressure here. The appropriate pressure in 800 - in this case Between 1200 kg.
4, injection speed. Rof increases the existence of internal stress, low internal stress situations injection speed should not be high. In this case, the injection speed should be in the 50 - 70%, is 45 - for normal injection molding machine 60 millimeters per second.
5, the holding time. Long pressure maintaining time can increase the internal stress, in this case, the holding time should be within 2 - 3 seconds.
6, melt velocity. This is a relatively easy to be ignored indicators, melt velocity have what use? Useful, in this case, melt velocity is too high can cause excessive tearing lower molecular weight molecular chain, thus to reduce the impact strength and modulus, the appropriate product cracking. The melt velocity should be controlled here - in 400 450 mm per second.
7, annealing treatment. This case to reduce internal stress, annealing treatment is necessary, the parameters of the annealing is 85 - Time 1-100 degrees 2 hours, the annealing time should be conducted as soon as possible after forming.
8, mold design. This case the product is split in the corner, R is small. The place where we know R small easy to produce stress concentration, it is necessary for us to all thickness, large R design, in this case the Chinese and foreign R 2. 5 - Between 3 mm and R should be in 1. 5 - Between the 2 mm.
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