● Changes in Gears Appear Gradually
When most equipment is newly put into use, the experience is relatively similar: smooth operation, quiet and comfortable performance, and overall stable operation. However, as the service time increases, this “similar” state is often broken, and differences gradually begin to appear.
- Some equipment continues to maintain quiet and stable operation;
- while others gradually show changes — noise becomes more noticeable, operation is no longer smooth, and the user experience may even be affected.
- These changes are usually not dramatic, but they are enough to be noticed.
So the question is: why do products that appear similar have different user experiences after one or two years of use?
● Find the Reasons
It is easy for us to attribute differences in user experience to brands or workmanship. However, in many household appliances and office equipment, the real factor affecting long-term experience may be the “invisible gear system” inside. For example, equipment such as printers, shredders, coffee machines, and robot vacuum cleaners all rely on gears for power transmission.
During long-term operation, gears continuously experience:
· Micro-vibrations caused by meshing impacts;
· Wear accumulation caused by friction;
· Structural effects caused by environmental changes (temperature and humidity).
These contacts continuously generate small impacts and vibrations in gears.
When these vibrations cannot be effectively absorbed, they will gradually transform into the noise we hear.
In other words: the source of noise is the “vibration” generated within the system.
The wear and clearance changes of gears after long-term use will further amplify this vibration, making equipment become increasingly “noisy”.
● So, How Can Equipment Maintain Quiet Operation?
1. Reduce the Generation and Transmission of Vibrations
For example, PK materials have a high damping effect due to their relatively low glass transition temperature (approximately 10°C). They can absorb and attenuate vibration energy during gear meshing, reducing noise from the source.
In fan noise tests, PK+GF showed a noise level 5 dB lower than traditional PA66+GF/MF, creating a quieter environment.
2. Prevent Vibrations from Being Continuously Amplified
Many devices can operate quietly at the beginning, but the real difference lies in: How long can this condition be maintained?
During continuous rotation, gears also need to withstand:
· Repeated start and stop cycles;
· Load changes;
· Humid environments or temperature differences.
If the gear material is not selected appropriately, over time, material wear will increase or dimensions will change. The gear clearance will then change, amplifying vibrations and transforming them into more noticeable noise.
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A Good Experience Also Means Less Disturbance
The noise generated by products is often not “unusable”,
but rather “continuous disturbance”.
During long-term use, the differences caused by materials in these invisible components cannot be directly perceived, but they gradually reveal themselves through every operation.
● Finally, Let’s Take a Look at What Advantages PK Materials Can Provide in Gear Systems:
1. Ensure Stable Operation: Resistant to Humidity and Chemical Environments
- Low Water Absorption:
The ater absorption of PK is approximately 0.5%, which is much lower than PA66.
This means that gears will not experience jamming or changes in transmission clearance caused by water absorption and expansion in humid environments or during long-term operation, demonstrating excellent dimensional stability.
- Excellent Chemical Resistance:
PK has strong resistance to acids, alkalis, solvents, and other chemicals, second only to PPS.
In daily use, even when exposed to cleaning agents or oil contamination, the material is not easily corroded or degraded, ensuring the long service life of gears.
2. Provide a Comfortable and Quiet Environment: Wear Resistance and Noise Reduction
- Excellent Wear Resistance：
PK materials have a low coefficient of friction, and their wear resistance is approximately 14 times that of POM.
During long-term operation, they experience less wear and are less likely to suffer performance degradation or failure.
This helps extend gear service life and reduce maintenance and replacement frequency.
- Noise Reduction Effect：
Operation becomes quieter and smoother.
It effectively reduces noise and vibration caused by friction, making operation more stable and quiet, significantly improving overall user comfort.
