EPS Pre-expander
EPS foam machine is a production equipment widely used in the packaging, thermal insulation materials, and foamed plastic products industries.
The following is a specific introduction:
1.Working Principle
The working principle of the EPS foam machine is to make polystyrene (PS) particles expand into foamed plastic products with a certain density and shape through the effects of heating, pressurization, and a blowing agent. The specific process is as follows:
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Pre-foaming stage: Put the PS particles into the barrel of the foam machine, and soften them through heating and stirring. Then, inject a certain amount of blowing agent into the barrel. The blowing agent quickly gasifies under the action of heating to form a large number of bubbles, making the PS particles expand into pre-foamed beads. |
Molding stage: Put the pre-foamed beads into the mold, and make them further expand and fuse through heating and pressurization to form foamed plastic products with a certain shape and size. |
Cooling stage: Take out the molded foamed plastic products from the mold, and solidify and shape them through natural cooling or forced cooling. |
2.Structural Composition
The EPS foam machine is mainly composed of the following parts:
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Barrel: Used to accommodate PS particles and the blowing agent, and carry out heating and stirring. |
Heating system: Used to heat the barrel to soften the PS particles and gasify the blowing agent. |
Stirring system: Used to stir the PS particles and the blowing agent in the barrel to make them evenly mixed and expanded.
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Blowing agent injection system: Used to inject the blowing agent into the barrel. |
Mold: Used to mold the foamed plastic products. |
Cooling system: Used to cool the molded foamed plastic products. |
Control system: Used to control each component of the foam machine to achieve automated production. |
3.Product Advantages
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High efficiency and energy saving: Adopting an advanced control system and professional foaming technology, it can automatically adjust the foaming process parameters according to different product requirements and process requirements, making the production process more efficient and energy-saving.
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High product quality: Adopting an advanced stirring system and precise metering device, it can fully mix the raw materials and evenly inject them into the mold, thus producing high-quality products with uniform texture, fine cell structure, and no toxicity or odor.
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High production efficiency: Using an automated production line and robotic operation, it can achieve continuous and automated production, greatly improving production efficiency. |
Low labor intensity: Using an automated production line and robotic operation can reduce manual operation links and lower the labor intensity of workers. |
Meet the needs of multiple industries: It can be customized for production according to different product requirements and process requirements to meet the needs of different industries. |
Wide application field: Due to the excellent performance of EPS foam products, they are widely used in various fields. |
4.Product Applications
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Packaging field: EPS foam products have excellent properties such as light weight, shock resistance, compression resistance, and moisture resistance, which can effectively protect products from damage during transportation and storage. Therefore, they are widely used in the packaging of industries such as electronics, glass products, ceramic products, food, and pharmaceuticals. |
Construction field: EPS foam products have excellent thermal insulation performance and lightweight characteristics, which can replace traditional thermal insulation materials such as rock wool and glass wool, and are used in engineering such as exterior wall insulation, roof insulation, and floor heating insulation of buildings. |
Autom field: EPS foam products have excellent sound insulation, thermal insulation, and shock absorption performance, which can improve the comfort and safety of vehicles. Therefore, they are widely used in the manufacturing of automotive interior parts, seats, instrument panels, door panels, and other components.
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Other fields: EPS foam products are also widely used in fields such as home appliances, electronics, sports equipment, and furniture, such as the packaging of home appliances, shock pads for electronic devices, protective pads for sports equipment, and filling materials for furniture. |

Hangzhou Fuyang Dongshan Plastic Machinery Co., Ltd. has specialized in EPS and EPP foam plastics machines for nearly 20 years, integrating R&D, manufacturing, sales, and service.
Located in Hangzhou, a rapidly developing area in China, and near major ports like Shanghai and Ningbo, the company enjoys a prime geographical location and convenient transportation for exports.
Since 2007, Dongshan EPS machinery has obtained CE certification from the UK and ISO9001 - 2008 quality management system certification. It has been recognized as a high - tech enterprise and received the "Level A of Honesty and Trustworthiness" honor. The "Dongshan" trademark is well - known. In 2010, the "Large Auto Lost - Foam Block Moulding Machine" won the third prize in the appraisal of excellent new products and technologies by the Hangzhou Economic Commission. So far, the company has been authorized 48 utility model patents and 6 invention patents. It has also achieved the National Torch industrialization demonstration project and the first - set project in Zhejiang Province, winning acclaim in the plastic machine industry.
Focusing on quality and innovation, Dongshan, with its professional team, has developed new products like Auto Block Moulding Machine series, Auto Pre - Expander Machine Series, etc. The Heavy Plastic Mechanical Block Moulding Machine can produce 50KG heavy plates and 4KG light plates per cubic meter, featuring high efficiency and energy - saving.
Adhering to the principle of "Quality - based brand, Service - based future", Dongshan has established branches in China and a global marketing network. Its EPS machinery is exported to over 50 countries, including Russia, India, and Brazil.
Warmly welcome customers to visit our factory.



Q1:How Can I get a EPS machine quotation?
There has multiple way to reach us, please contact us by website live chat, email, or phone number, forms, our expert will contact with you within 8 working hours.We can send the quotation lists when get the detail inquire.
Q2:What is the delivery time for EPS machine after placed the order?
It's depended on what you have ordered, below is regular delivery for your reference.
EPS Expandable Polystyrene machine: 60 days
EPS Expandable Polystyrene mold: 20-30 days.
EPS Expandable Polystyrene machine spare parts: 3-7 days.
Q3:What is the normal delivery term to order EPS machine from China?
The standard delivery term for EPS machine is EXW Factory
FOB Ningbo or Shanghai/CIF
Q4:What Payment term is acceptable if I decide to buy the EPS machine from you?
Both T/T and LC at sight is available.
Q5:Do you have ready EPS machine in stock to sell?
No, we produce the EPS Styrofoam machine equipment based on each customer's unique request.so we do not have stock to sell.
But for EPS machine spare parts, we may have some stock, please contact us before placing order.
Q6:How long is the warranty period for EPS machine?
13 months from date of shipment, excluding quick-wear part
Q7:Do you offer assemble and install service for EPS machine?
Sure, We usually send 2 technicians to the customer's factory together to assemble and testing the EPS machine until it is ready for production.
For some special areas of the country, if it is not convenient to send technical personnel abroad, we welcome customers to visit us in China EPS machine factory, we provide onsite EPS machine assembling and installation service, make sure the EPS machine in the customer's factory can be assembled smoothly.
Q8:Do you offer training service for EPS machine?
Yes, we have training book and provide the training service till customer gain all the skill of operation the machine and ready for production
Q9:Do you offer EPS turnkey project?
YES, we offer EPS turnkey projects, but we only produce EPS machine, other auxiliary equipment like steam boiler, steam tank, air compressor air, compressed air tank etc. are produced by our supporting outsourcing factories.
Most important, we provide the overall turnkey installation and testing service, and be responsible for the turnkey results.
Q10:Do you offer EPS machine layout for the EPS plant?
Yes, we provide EPS machine layouts and pipe layouts for the EPS plant for free.
Q11:Where does the company located?
Our company located in Hangzhou city, Zhejiang province, where is about 1 hour from Shanghai by train and 1.5 hours from Guangzhou by airplane.We keep a sharp eye on the EPS machine business and bring the constant value information to our customer worldwide.