How to Determine the Production Formula for Flexible Polyurethane Foam?

The determination of the production formula is based on the coordination between the basic formula and the foaming machine.

1. Basic components of a block polyurethane foam production line

Raw material and temperature control system

Metering system

Mixing system

Conveyor system

Paper feeding and collecting system

Machine operation system

Exhaust and ventilation system

Block length cutting system

Block conveying and storage system

2. Types of foaming production lines

3. Drop plates

Functions:

*By raising the drop plate, the reactive force on the bottom of the foam caused by the lifting of the material center of gravity can be reduced, thus lowering pressure at the bottom—meaning part of the material rises upward and part downward, reducing density gradient.

*Adjusting the first three plates controls the fluid's rising angle to reduce backflow and splashing and prevent relative fluid displacement.

*Adjust the curve of the drop plates according to the foam growth status to achieve uniform vertical foam rise.

*Adjust the last drop plate to create a large tilt angle for faster material settling, flattening the foam surface to increase yield.

Specifications: 7m plate, 8m plate

4. Principles for setting production formulas

Example of base formulations:

① Formulas should match drop plate specifications.

② Formulas should align with conventional foam specs. For example, with density = 8 kg/m³:

③ Production formulas should also consider production efficiency.

④ Make fine adjustments based on operating habits.