insulation in winter, there are articles on strike
Solar energy is a low-carbon energy, both saving and environmentally friendly, , not only energy saving but also with the other water heater to save money, so more and more people welcome. However, master Liu in Tianjin last year to install solar water heaters in the winter turned out to strike Qi Gong, which in the end is how it happened?
[Period] (Shanghai Ning Chenyang solar water heater factory workers)
Workers: foam material it will not the same? Impossible, or the same foam material. Most is that they are a little advanced equipment, mechanization, mechanization of the whole, the quality is the same.
[Text]
Reporters saw the workers first, and the processed water tank shell on the steel frame in place.
Next, workers from two bucket to scoop out the two different colors of liquid poured into an iron cylinder yard.
[Period] (Shanghai Ning Chenyang solar water heater factory workers)
Workers: This is a white material.
Correspondent: This is the white material.
Workers: this is the black material.
Correspondent: This is the black material. What proportion of this increase by ah?
Workers: one to one.
[Text]
Workers are called \"black material\" is \"more than methylene diphenyl isocyanate,\" commonly known, so the colors are black, so that the black material; \"white material\" is commonly known as polyether polyols, color is white, so that white material. Black material and white material after stirring, quickly pour the water tank and shell in the middle of the gap.
[Year]
Reporter: This side to Gary?
Workers: Yes.
[Text]
The original material is a liquid black and white material chemical reaction, foaming, swelling up, and soon formed a solid insulating layer. Industry put this black and white material mixed foam material to form the material known as \"polyurethane foam.\"
Polyurethane is a very good insulation, but its high technology and technical requirements, in accordance with technical requirements, the workshop production of insulation should be closed, the indoor temperature should be controlled at 20-30 degrees Celsius, but also with a high temperature aging treatment equipment, but here in addition to two barrels of steel and a few broken, there are no other devices, totally inconsistent with the process requirements.
As the completely manual operation, where production of a water tank insulation, you need to complete several foam.
[Period] (Shanghai Ning Chenyang solar water heater factory workers)
Reporter: add a few back?
Workers: this fill up, usually to increase five times.
Reporter: about plus five, that trouble you this enough?
[Text]
After half an hour, the workers completed the foam, the water tank removed from the steel frame. Reporters found that just produced a lot of empty water tank insulation.
[Year]
Reporter: You do not send this foaming Well, this is so ah.
Workers: the middle there will be gaps.
Reporter: there will be gaps.
[Text]
Water tank insulation Why are so many holes it? The worker tells us the reason: these holes are caused by manual foam – foam as hand pressure is low, the middle of two hard foam seal, there will inevitably empty.
This backward production technology has long been out of the big manufacturers. Presently, have all adopted the automatic high-pressure foam machine foam, foam molding, insulation layer density, thermal insulation effect. Experimental data show that the use of fully automated production of high pressure foaming machine insulation, thermal conductivity is very low, generally in the 0.02 W / m ° (W / m · K) or so, effective insulation, foam production and use of hand insulation layer, the pressure is low, the need to complete several foam, insulation layer density, thermal conductivity up to 0.05 W / m ° (W / m · K), and automatic production of high pressure foaming machine insulation compared to the thermal effect has to be a lot of difference.
Reporters in the morning sun solar water heater Haining plant survey, also found that such a strange phenomenon: in the production process of the insulation layer, each complete a foam, the workers have to add something to the tank. The original workers are added to the tank waste. The worker said, these wastes are used for solar water heater from the tank on the dismantled. So why add the foaming process these waste it?