Application of polyurethane adhesives in air filters

How is polyurethane material used in air filters?

There are three main forms of application of polyurethane in air filters. Let’s learn about them together.

1. Polyurethane is used in air filters in the form of hot melt adhesive

1. Assemble the filter element according to the process;

2 . Clean the surface of the filter element cover to remove oil and dust, and dry it thoroughly. There should be no oil, moisture or other foreign matter on the surface to avoid affecting the bonding strength;

3. Inject an appropriate amount of adhesive into the rotating filter element cover so that the adhesive surface is evenly coated on all parts of the filter element cover. ;

4. Insert the filter element into the filter element cover and check both On the surface of the adhesive joint, ensure that it is in complete contact, then apply a little pressure on the top and let it sit;

5. After about 2 hours of curing, turn it over and glue it with the other end cap. It can be packaged after it is completely dried for 24 hours. It will be shipped after curing for 3 days;

6. Some filter elements require a rubber strip on the upper end cover, which can be added in step 5.

2. Polyurethane filter element Form applied to air filter

Wet air filters are generally used on construction machinery and heavy-duty trucks. The manufacturing material is soft, porous sponge-like polyurethane.

3. Polyurethane shell The solid form is used in air filters

The shell is produced by pouring PU elastomer, which can save The iron end cover and rubber sealing ring of the air filter element are removed, and it is the most ideal product for producing pull-type air filter elements. The shell is divided into end cover and frame, each with different production processes. span>

1. End cap type: By pouring the mixed AB material into the rotating iron disc or plastic disc, and then put the filter element to apply pressure. After a few minutes, the disc can be detached to obtain the air filter.

2. Through closed mold production, the prepared filter paper is placed on the upper mold, and the lower mold is wiped or sprayed with a special release agent in advance, and then the AB material is poured, and then the upper and lower molds are Close the mold and open it after a few minutes to take out the molded air filter.

The above is about the use of polyurethane materials in air filters Three application forms of application.