[Surface Treatment Resolution Case] Preventing Stringing in Thermal Welding of Filter Cases

Achieving both high-temperature release and long lifespan with thermal fusion type! Reducing thread pulling and ensuring long lifespan with heat-resistant fluorine coating!

■Consultation This was a consultation regarding the process of thermally welding filter cases to products. We create products by thermally welding polypropylene containers and lids, but PP resin tends to cause stringing and adhesion to the heating plates, which negatively impacts the product's airtightness, aesthetics, and production efficiency. Therefore, it was necessary for the thermal welding plates to have release properties, heat resistance, and durability. ■Background for Coating Selection We proposed fluororesin coatings and reduced contact area fluorine coatings during prototyping. Since the operating pressure is relatively low, the release properties improved, making stringing and adhesion less likely, allowing for relatively long service life. ■History and Effects of Coating To achieve even longer service life, we proposed "CHC-1311," which balances heat hardness and reduced contact area. After practical testing, it was adopted, resulting in reduced metal exposure due to wear, allowing for extended use. If you are having trouble with thermal welding jigs, please consult Yoshida SKT.

Resin mold