Constant-Temperature Mold Foaming Technology and Batch Quality Auto Filter Consistency Control

The stability of PU frame quality largely depends on mold temperature control during foaming, which is a core precision process in modern filter manufacturing. PU foam chemical reactions are extremely sensitive to temperature deviation. Too high temperature causes rapid foaming, surface skinning, internal hollowing, and brittle frames; too low temperature leads to incomplete reaction, soft frame body, poor viscosity, and easy deformation.

Advanced filter factories adopt full-automatic constant-temperature mold circulation systems. All filter molds are equipped with precision temperature sensors and circulating heating pipelines, keeping the mold cavity temperature fixed within the optimal reaction range at all times. Before glue injection, the mold is preheated evenly to eliminate temperature difference of the mold surface and ensure uniform foaming reaction of every position of the frame.

In batch mass production, constant-temperature mold technology completely eliminates quality differences caused by seasonal temperature changes, workshop environment fluctuations, and equipment heating errors. Every finished PU frame has consistent hardness, elasticity, thickness, and adhesion. The unified production standard ensures zero difference between sample products and bulk goods, providing stable and reliable product quality for global wholesale customers and long-term order cooperation.