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EPS with the full name Expanded polystyrene is a rigid porous plastic that can be found in many shapes and applications. It is most commonly used in fish boxes, consumer goods packaging and building insulation boards. To make high-quality EPS you need to do a pre-expansion, in this process, the EPS beads are sent to a pre-expander equipped with a stirrer and controlled steam and air supply. The combination of these two conditions causes the volume of EPS beads to expand. The diameter of the particles increases, while the density of the resin decreases. So, how to correctly operate an EPS pre-expander machine? Please allow me to introduce to you the contents below.

What is the EPS pre-expander machine?

Generally speaking, an EPS pre-expander machine is a certain kind of machine that makes sure the production line constantly get high-quality material and a steady repetitiveness of the production with reduced cycle times. The EPS pre-expander machine can also give the products(EPS) a minimum residual humidity, therefore ensure the quality of the products and the high effectiveness of the production. Another thing about an EPS pre-expander machine is that it can ensure the production line achieve availability to a broad range of densities. A high-quality EPS pre-expander are also equipped with Intelligent density control system that enables it to get timely density report and to automatically adjust parameters according to density tolerance, a closed expansion chamber and a pressure sensor control technology to realize stable foaming pressure, and an electronic weighing device attaches to the expansion chamber to realize real-time measurement and control.

How to operate an EPS pre-expander machine?

As mentioned above, the working principle of EPS pre-expander machine is to expand a fixed amount of raw materials to a fixed volume to achieve the required density. It sounds pretty easy but actually, there are multiple steps of the working process, so there is a need to know how to operate it well. EPS pre-expander machines are typically controlled by a full-colour touch panel. Since EPS pre-expander are mostly fully automatic, the operator of it does not need to do too much interaction with it, the main job of the operator is to use the display to correctly change process parameters, so that the recipes can be correctly added, changed or saved in the PLC.

What are the precautions of using EPS pre-expander machines?

Even though a fine EPS pre-expander is automatic and reliable, there are still precautions that are needed to keep in mind. Firstly, in the case of a sudden power failure, the EPS pre-expander will automatically close the steam valve, open the material door and compressed the air valve to cool it, so that it can prevent the foam material in the barrel from condensing into agglomerates. If you want to discharge the raw materials in the barrel, you can use a blower or compressed air to blow out the foam material in the barrel, and then separate them according to the actual situation of the foam material. Secondly, when the machine needs to enter the barrel for maintenance, it is necessary to cut off the main power supply and set up a dedicated person to monitor it. After the maintenance is completed, please strictly check the remaining tools and parts in the barrel. Otherwise, the ventilation plate and rotating bracket at the bottom of the barrel will be damaged. Thirdly, in the production process of the machine, please strictly prevent the foreign matter mixed in the EPS material from entering the foaming barrel to avoid damaging the bottom ventilation plate. Fourthly, in the production process, the machine operator must pay attention to the sensitivity and reliability of the electric contact pressure gauge. If a problem is found, the electric contact pressure gauge must be repaired or replaced in time to ensure the normal and stable production of the machine. Last but not least, when inspecting and maintaining the machine, remember to turn off the power to avoid personal accidents.

If you are looking for a reliable EPS pre-expander machine to purchase, please make sure you check out the ones in Hangzhou Fangyuan Plastic Machinery Co., Ltd, those nice and high-quality machines are definitely appealing to your unique taste.

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EPS Pre-Expander：

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A certain amount of foaming agent and water vapor are retained in the beads pre-expanded by EPS pre-expand machine. When they are discharged from the machine, they condense into liquid, and the liquid foaming agent dissolves into polystyrene, so that the pressure in the bubble is quickly reduced, and there is negative pressure (partial vacuum) in the bubble. The beads are very soft and easy to deform. Therefore, during air supply, try not to make the wind pressure too large, the inner wall of the air duct should be as smooth as possible, and the bending radius should be as large as possible (reduce collision resistance). The pipeline should be a good conductor of electricity. The whole line must be grounded to avoid electrostatic ignition, and the transmission speed should not exceed 8m / s to avoid bead damage.

The beads just out of the EPS pre-expand machine are wet. After being discharged from the EPS pre-expand machine, they absorb air and suddenly encounter cold, resulting in the condensation of foaming agent in the honeycomb cell and the formation of negative pressure in the cell. Therefore, the beads must be placed for a period of time after EPS pre-expand machine. On the one hand, they must be dried, and on the other hand, they must penetrate into the air to eliminate the negative pressure, so as to balance the internal pressure and external pressure in the cell, In order to avoid the collapse of the bubble hole and make the beads elastic.

The process of drying, cooling and stable cell pressure of EPS beads just out of EPS pre-expand machine is called ripening. Ripening can improve the further expansion, fusibility between beads and elasticity of beads in the molding process, which is conducive to improving the quality of EPS products.

About great shape molding machine manufacturer:

China Longwell is a professional EPS Machinery Supplier and polystyrene machine manufacturer, We offer kinds of EPS machines, EPS molds, 3D panel machines, sandwich panel machines, assistant facilities and all kinds of EPS machine spare parts.

For more product information about YouTube or product information, you can click on the relevant link below.

Hangzhou Fuyang Longwell Industry Co.,Ltd

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2.Lost-Foam Pre-expander

3.Continuous EPS Pre expander for Polystyrene Material Beads Foaming

4.Auto Batch Pre-Expander Accurate Type for High Density EPS Beads Foaming

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