In my own previous how to we discussed how exactly to configure your XPS creation plastic pellet extruder line. Today, I will tell you something about how exactly to determine the portfolio of the blowing agencies for XPS creation. I will discuss from 4 aspects, local regulation, resource availability, local insulation standard, and technical issues.
First of all, local regulation, probably the most well-known blowing agent of XPS is Freon, some halocarbon including CFCs, HFCs and hcfcs. Every national country has its own regulations about the usage of Freon. In most developed countries, HCFC now is banned, while in some developing countries like China, still may use it until 2030, Indonesia may use it until 2040. But many countries are undertaking the new intend to speed up the phasing out schedule of HCFCs. One thing I must address is the fact that because of the poor solubility in polystyrene, CO2 can't be used as blowing agent alone; it must be used in combination with other co-blowing agent like ethanol together, butane or DME etc. as solvent to help CO2 solve in to the polystyrene.
Secondly, source availability. In some national countries, some kinds of blowing real estate agents aren't available. For example, in some Middle East countries, ethanol is not available and not permitted to import, so you have to make use of something else to be alternatives. And in some countries, even HFCs are not obtainable and not permitted to make use of, let alone HCFCs. You have to check with your power to start to see the source availability.
Finally, local insulation standard. Almost every national country has its standard of thermal conductivity of XPS board. Let's consider China; the China national regular of thermal conductivity of XPS is certainly 0.030. On the other hand, some countries don't make use of thermal conductivity as the regular; they use thermal resistance R or value value instead. But how does the standard has something to do with your recipe of blowing agent? The good reason is that using different blowing agent can result in different thermal conductivity. For example, by using HFCs or HCFCs, you can control the lambda value below 0.029. If you use CO2 plus ethanol however, it really is hard to make the lambda worth under than 0.033. To get the lambda worth below 0.030, some companies are using the combination of HFC, CO2 and ethanol.
The last issue, I'd prefer to talk about is the relationship between thickness, hardness as well as the recipe of blowing agent. Using HCFCs or HFCs is simpler to obtain width like 15cm. If you use CO2 alone as the primary blowing agent, it might be very hard to get such thickness unless your series can yield 1.5 ton each hour. But CO2 is advisable if you produce high compressive power board like 1000kpa for special make use of, because CO2 provides smaller cell quantity which is beneficial to get finer cell structure of the table.