eps pre expander machine

EPS pre expander machine’s function is to make eps raw material into eps beads. The eps beads can be used to make eps blocks, eps boxes, eps cornices, etc or they can be mixed with concrete to make lightweight concrete. They can also be used alone to make lying bags, etc.

EPS Pre Expander Machine Technical Parameters：

The EPS pre expander machine has a cylinder with a stirring device inside, its structure is similar to the reaction kettle. It is equipped with a feeding device, a discharging device, an electronic control system, an intake pipe system, and an exhaust pipe system. Raw materials are added into the cylinder, and then steam is injected into the foaming machine under the control of an electronic control system for heating. The raw materials expand because of heat. By adjusting the steam pressure and heating time in the foaming machine, we can obtain the foam granules with the density we need. Then the expanded foam particles are discharged into the drying box directly. The foam granules pass through the drying box and are blown into the silos by a fan for storage.

Secondary foaming:

Generally, when the foam material is heated for the first time, it can only expand to about 7kg / m3 at the lightest. If it continues to heat, the granules will be destroyed and the density will become heavy. If you want to get lighter foam granules, you can place the granules in the silo for several hours. After the granules are stable, put it in the foaming machine and heat it again. The lightest can reach 4-5kg / m3, this method is called secondary foaming.

To expand eps, the main machine is eps pre-expander machine. We can also call it eps foaming machine or eps beads making machine. Auxiliary machines such as steam boiler, steam accumulator are also necessary because the expansion of eps is made by steam.

We can get different densities of eps beads from 4.5kg/m3 to 40kg/m3 according to different requirements. 

The main features of eps pre expander machine:

◆The machine includes pre-expander, drying bed, high-pressure feeding fan, screw conveyor, material silo and all other necessary parts.

◆It is controlled by PLC system and it has touch screen which can realize a full automatic operation of material feeding, automatic electronic calculation, automatic temperature and pressure control, automatic material level measuring, etc so that the machine can produce automatically.

◆The equipment adopts photoelectric material temperature gauge control system, and correctly grasps the bulk density of foaming material. The density of beads after foaming is uniform, and the error is less than 3% each time.

◆The temperature and steam pressure in the barrel are controlled by an advanced imported proportional valve and a high-precision pressure reducing valve to ensure that the pressure at the outlet of the pressure reducing valve is always constant, ensuring that the temperature in the barrel of the pre-expander is controlled at ±1% °C to ensure the consistency of the expanded eps material, preventing the EPS material from agglomerating due to poor temperature control.

◆The automatic pressure feeding device and the electronic weighing device are combined with the material level switch to realize automatic feeding, which improves the production efficiency, and the barrel body adopts closed foaming method so it has high thermal efficiency and save steam.

◆The electrical appliances, pneumatic components and valves used in this machine are all well-known brands at home and abroad, thus ensuring the stability and reliability of the machine operation and long service life.

◆The automatic discharge of the barrel adopts the yasso air blowing to increase the discharge speed.

◆The computer has a memory function, which can record the number, specifications, foaming process and parameters of the eps raw material that has been used in this machine. When you need to use the raw materials of the past manufacturers, you can return to the parameters that has been stored in the process by simply pressing the touch screen. 

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