Temperature and pressure are two key quantities in the foaming process of polyurethane foaming machine. 

If the pressure of polyurethane foaming machine is too low, the two components can not be fully mixed and affect the foaming speed, but too high will put forward higher process requirements for the whole equipment. 

It will also have a great impact on the foaming speed is the temperature, the temperature is too high, the reaction speed is accelerated, the corresponding requirements of other equipment and technology to adapt to it; the temperature is too low, the reaction becomes slow, the curing time is long, which affects the production efficiency accordingly. 

Therefore, in the design process, according to the process requirements, the temperature must be controlled in the range of 65 ±1 ℃. 

The pressure of polyurethane foaming machine can be changed by setting the action number of air pump per minute, which has high flexibility. 

The temperature control is realized by two solid state relays, which is controlled by PID, which has the advantages of fast response and good stability. 

According to the component metering pressure and mixing system, polyurethane foaming machine can be divided into two categories: low pressure foaming and high pressure foaming. 

Polyurethane foaming machine foaming principle: different components of the original liquid, through the accurate ratio and high-speed mixing, by the high-precision metering pump, each component liquid is transported to the mixing head. 

After high-speed strong stirring, so that the material and liquid uniform and ejected to form the required products. 

Matters needing attention in the Operation of Polyurethane foaming Machine. 

1. Polyurethane foaming machine operation polyurethane group A, B materials must wear protective goggles, work clothes and caps, wear rubber gloves, the working environment must be well ventilated, clean and hygienic. 

When the ambient temperature is high, the pressure will be caused by the partial vaporization of the foaming agent in polyurethane A material, so the exhaust cover should be opened first and then the barrel cover should be opened. 

High pressure foaming machine for thermal insulation and filling. 

2. When the polyurethane foaming machine has flame retardant requirements for foam, the polyurethane foaming machine can use additive flame retardant, and the amount of ordinary flame retardant is 15% 20% of the weight of white material. 

Flame retardant adding polyurethane A must be stirred evenly before foaming. 

3. During the manual foaming operation of the polyurethane foaming machine, the polyurethane group A and group B are proportionally and accurately weighed and poured into the container at the same time. After stirring with a mixer of more than 2000 rpm for 8 to 10 seconds, 

Pouring into the mold foaming demoulding time depends on the product requirements, foam thickness and so on. 

4. When the skin comes into contact with the combined polyurethane A material, rinse with soap and water, and when the polyurethane foaming machine operates the polyurethane B material (with certain irritation), do not inhale its steam and do not splash on the skin and eyes. 

If splashed on the skin and eyes, wipe it off with medical cotton immediately, then rinse with plenty of water for 15 minutes, then rinse with soap or alcohol.