Introduction of top dry and wet process for automobiles
The structure of dry ceiling material is generally fabric / rubber powder / glass fiber / PU Rigid foam board / rubber powder / glass fiber / non-woven fabric
The structure of wet ceiling materials is generally fabric / glue / glass fiber / PU Rigid foam board / glue / glass fiber / non-woven fabric.
The mechanical properties of dry and wet ceiling are basically similar. The dry process has the advantages of high efficiency and environmental protection
The roof of the method is slightly full in sense; the wet process requires two sets of molds, which are molded twice with stable shape,
High efficiency, the wet process usually uses solvent based adhesives, and a large number of organic solvent rings are discharged in the production process
It's better to protect the nature than to do it.
In general, the adhesive in the middle of dry PU composite board is HDPE hot melt adhesive powder (domestic), EAA hot melt adhesive film
(foreign); advantages and disadvantages of both: rubber powder disadvantages processing environment is poor, there is dust, and it is easy to appear in the process of powder spreading
The sound absorption of the composite ceiling is also worse than that of the rubber film due to the uneven phenomena such as caking, because the pores of Pu are covered with rubber powder
The disadvantage of glue film is that it can't bond glass fiber layer well
The number of glue powder is much smaller, so its poor fluidity is not easy to penetrate into the glass fiber layer), so the glue film is used
In general, glass fiber felt and glass fiber cloth (glass fiber + rubber powder + non-woven cloth) are used to make composite first
Its cost is higher than that of the former. Its forming process is first PU foam and glass fiber, rubber powder and non-woven fabric are combined into PU.
Composite board, and then heat it to combine with the fabric and cold press it into the ceiling in the mold, process characteristics; cold mold hot material
The hot-melt adhesive film is actually polyethylene plastic film. Advantages: simple process, even glue surface, low cost.
Why does dry method exist? The reason is very simple. The cost of dry mold is much lower than that of wet mold, which is the choice
Important reasons. Second, equipment limitations. In general, the replacement of equipment is based on the original equipment
In other words, it is inevitable that there is a dry method.
Wet ceiling coating is divided into two times, the first time in the skeleton molding, polyurethane glue and water according to the proportion of uniform
Spray it on Pu board, then lay it together with non-woven fabric, glass fiber cloth and other reinforcing material layers, and heat set it.
For the second time, composite the fabric, spray glue on the formed skeleton, and then cover the fabric. Process features: hot die cooling
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