| Compare the diameter of the molecule of the vapor and rain drop |
| type |
diameter/μm |
type |
diameter/μm |
| Vapor molecule |
0.0004 |
flurry |
900 |
| Light fog |
20 |
rain |
2000 |
| fog |
200 |
downfall |
3000-4000 |
| mizzle |
400 |
rainstorm |
6000-10000 |
|
You can find from the blank, you can prevent the rain to penetrate and allow the vapor to get in only by changing the diameter of pore of the membrane. In the other parts, because the tangency angle of the PTFE membrane surface is above 90℃, it can prevent the liquid water clouding and penetrate. So it reaches a result of waterproof and moisture permeability.
Technical specification of the DENTIK PTFE membrane:
1. Thickness 25μm--35μm;
2. Numbers of the pores per centimeter more than 1billion/cm2;
3. Diameter of the pore 0.2μm—1.0μm;
4.breathability>10000g/ m2.24h;
5. water resistance>6000mm水柱；
6. Accommodate temperature range:-150℃--300℃;
7. it is perfect in resisting cautery, acid and alkaline.
|
The basic requirement for the waterproof and breathable fabric
The research makes clear that only when the garments close to the skin, when the temperature is 32±1℃ and the humidity is 50±10℅, people will fell most comfortable, and the human body is at its best physical state. Perspiration is an effective cooling method for adjustment of the thermal equilibrium of the body. 80%-90% of the heat was emanated by the skin. And the evaporation is the main method of hest loss when you are in hot state, slow wind speed or vehemence sports.
When the body sweat a lot and the garments can't release the vapor out of the garments, it will affect people's comfort and sports ability, also it is very dangerous when you are in chilling circumstance. Therefore, waterproof and breathable fabric must have conditions as below:
1.Breathability
Table 1
|
| Perspiration when do different movement |
| movement |
perspiration(g/m 2 .24h) |
movement |
perspiration(g/m 2 .24h) |
| rest |
350 |
brickwork |
1930 |
| walking |
2305 |
Sawing wood |
2400 |
| digging |
3000 |
Cutting wood |
2860--3780 |
| Bearing climb |
3780 |
Climbing the ladder |
3090 |
|
| 2 perspiration when you are in different temperature |
| Movement quantum (g/m 2 .24h) |
Perspiration when different temperature(g/m 2 .24h) |
| 0℃ |
10℃ |
20℃ |
| sitting(50) |
290 |
320 |
430 |
| standing(97) |
430 |
520 |
720 |
| walking(140) |
1580 |
1660 |
2010 |
| Middling laboring(220) |
2010 |
2330 |
2730 |
| Heavy laboring(300) |
2930 |
2990 |
3880 |
|
|
|
