Zonglan Hand Tools for eyelets consist of piercing and attaching hand toolsets. Eyelet Dies,Grommet Machine Dies,Eyelet Flaring Die,Eyelet Press Dies NINGBO ZONGLAN MECHANICAL AND ELECTRICAL EQUIPMENT MANUFACTURE CO., LTD , https://www.zonglaneyelet.com
This manual set is designed to be used with a hide face mallet. It is good for piercing material and attaching curtain eyelets afterward. Not all hand tools are the same and it is not easy to find such a highly qualified hand tool for attaching curtain eyelets in today`s world.
Though these tools are designed for low-volume eyelet application projects, Zonglan Hand Tools are professionally designed and produced with advanced technology for decades of problem-free use. Zonglan Hand Tools are made of Stainless Steel to increase their resistance to oxidation. Their surface is specially treated for metal hardening for stronger durability against harsh hammer usage.
Zonglan Hand Tools are designed in such a manner affording the use of minimum force with maximum comfort. In addition, thanks to its precision, the eyelet application quality of Zonglan Hand Tools is far better than the application quality of its ordinary competitors.
Our hand tools sets are available for 6mm,10mm and 12mm Easy Apply Zonglan eyelets and are suitable to attach them onto various substrates, including tarpaulin, drapery and home textile.
In a peculiar incident in the United States, trees along a highway mysteriously died. Initially, people suspected car exhaust as the cause. However, after extensive research, it was discovered that the real culprit was the vibration from passing vehicles. These vibrations disrupted the root-soil connection, ultimately leading to the trees' death. This surprising case highlights how even subtle vibrations can have devastating effects on living organisms. But what about humans?
Life in the modern world is filled with constant vibrations. From underground trains to buses and factory machinery like lathes, grinders, and drills, we are surrounded by various sources of vibration. These vibrations, though often unnoticed, can pose serious health risks. As a result, vibration has been classified as a major form of pollution in industrial settings. Scientists have linked many chronic illnesses to prolonged exposure to mechanical vibrations.
Studies show that human reactions to vibrations vary depending on their frequency. Experiments have demonstrated that when people sit on vibrating chairs and the frequency increases gradually, different sensations occur at different levels. Below 1 Hz, vibrations mainly affect the head, causing discomfort after a few minutes. Between 1-2 Hz, drowsiness becomes more likely. At 3-4 Hz, the waist and chest start to feel the movement. When the frequency reaches 5-8 Hz, discomfort peaks, affecting breathing and speech. At 8 Hz, the lower back is most affected, while 9-30 Hz causes facial and neck vibrations, impacting vision. Above 30 Hz, these sensations begin to fade.
Why do we react differently to varying frequencies? The human body itself contains natural "vibrating systems." When an external vibration matches the body’s natural frequency, resonance occurs, amplifying the effect. Research shows that the human body is most sensitive between 5-8 Hz, followed by 10-12 Hz, which relates to the resonance of internal organs. Other frequencies also affect different parts of the body—such as the hands being most sensitive to 18-50 Hz, the head to 2-30 Hz and 500-1000 Hz, and the jaw to 6-8 Hz. This explains why certain frequencies lead to visual disturbances, hand fatigue, or speech issues.
So, how much vibration can the human body tolerate? Generally, vibrations below 20 Hz become noticeable when the acceleration reaches 0.01g (equivalent to 1g of gravity). At 0.05g, people may feel slightly uncomfortable, but at 0.3g, balance is disrupted, leading to dizziness, fatigue, and depression. Prolonged exposure to higher intensities can damage the nervous, cardiovascular, and motor systems.
To protect against harmful vibrations, the best approach is to minimize mechanical vibrations or use isolation and damping techniques. Workers in high-vibration environments should use shock-absorbing cushions or wear stabilizing bands. Avoiding highly vibrating areas is the safest choice.
China Labor Insurance Network