一本大道道香蕉a高清_亚洲午夜福利av一区二区无码_又黑又长又粗欧美在线视频_97人妻在线视频网_老司机67194熟妇在线播_国产香蕉久久_heyzo加勒比中文字幕_欧美性生活视频网站_日本黃色三級片a做愛电影免费看_一级片好看中文字幕

Foam machine under the action of high pressure gas through the device to produce bubbles. This device has a significant impact on the quality of the foam. High pressure foaming equipment is low speed high speed impeller (tablet) after the third generation of foaming machine foaming device, the current foaming device in China has been very popular mainstream, generally divided into fixed, manual control, automatic control and manual control three common domestic. The final product of foaming system is foam, foam quality is the only standard to determine the quality of foam foam, foam machine performance measurement, should be based on the following three aspects, that is, bubble fine, bubble uniform, foam bleeding water. Whether the foaming machine can meet these three aspects should be confirmed by the testing machine.

A small foam must be compact, bubble size has a great impact on the quality of foamed concrete, the main impact is as follows:

The smaller the bubble size, the higher the strength of foamed concrete; The larger the bubble diameter, the lower the strength of the foamed concrete. The strength of bubble diameter is inversely proportional.

Larger foams, more connecting holes, high water absorption, poor pressure tolerance, easy break of slurry and connection in slurry slurry slurry pressure.

Greater foam, which is worse for pouring stability.

The larger the foam, the poorer the insulation of the foamed concrete.

The experimental results show that the same foamed concrete has better heat insulation effect than foam.

　　According to the above principle, the foam of concrete should be small to ensure the quality of concrete. To this end, the hairPolyurethane foam machine principle bubble diameter must be less than, about the best, too small, not only affect the output, but also increase the strength is not big. Test results show that holes above mm are harmful, so control foam below. Except, of course, for special technical requirements.

　　The production of foam. It must be unified. The more uneven the foam size, the more prone the casting collapse. In addition, the greater the foam loss, the more waste foam agent. Bubbles are most likely to burst because of their uneven size. A more uniform bubble, this bubble is more stable.

　　Foam low bleeding rate, no foam emulsion. The higher the bleeding rate, the worse the foam quality. Because high bleeding rate means that the bubble wall is too thick, the bubble liquid between large amounts of water is much less bubbles. In addition, it is necessary to remind you that foam has a high moisture content, a large number of foaming agents do not make foam, reduce the number of foam. In addition, the choice of high quality foaming agent is also crucial.