Author: Cynthia Cheung

Low-density polyurethane (PU) sponge foam, with a density below 18 kg/m³, faces a significant challenge in heat dissipation during production, particularly when the water-to-polyol ratio exceeds 4.5 parts per 100 parts of polyether polyols, and TDI (Toluene Diisocyanate) usage surpasses 55 parts. The limited heat dissipation within the foam can result in temperatures exceeding 180°C during the foaming process, posing a severe risk of self-ignition and potential fire hazards.

Polyurethane foaming is a process that uses isocyanates and polyether polyols as the main raw materials, with the assistance of various additives such as foaming agents, catalysts, flame retardants, and more. This process involves mixing these components using specialized equipment and then foaming them in situ under high pressure to create high molecular weight polymers.

The following are descriptions and suggestions of the physical properties of polyurethane foam. Hope the foaming tips can help to solve some of your problems during the foaming process.

A polyurethane (PU) foaming machine comprises several distinct components, each serving a specific function:

To increase the resilience of flexible polyurethane foam, you should focus on Cell Openness, Cell Geometry and Polyurethane Raw Materials.

Polyurethane foam sponges are a variety of soft polyurethane foam plastics known for their porous honeycomb structure, which provides excellent softness, elasticity, water absorption, and water resistance. They find extensive use in industries like furniture, mattresses, clothing, and soft packaging.