Describe The Foaming Molding Process

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The process of foaming polystyrene foam molding can be divided into two steps:

first step: The first step is to fill the mold cavity with prefoamed polystyrene particles.

Second step: In the second step, the particles reach the softening temperature through heating. The infiltration of the foaming agent into gas and heating medium in the bubble hole causes the particles to expand further. Due to the limitation of mold cavity volume, the expanded particles fill all cavity space and fuse into a whole.

After cooling and shaping, the mold is taken out, that is, the hair foam polystyrene foam molding products.

Moulded foaming is the main manufacturing method of automatic foamed sheet machine for the foamed polystyrene foamed plastic products, such as the foamed plastic products for packaging and the foamed plastic bulk materials.

Steam mould-pressure foaming is a common and economical method for the manufacture of expandable styrene foamed plastics and bulk materials.The method is to fill the mold cavity with prefoaming particles, close the mold and press the mold to prevent the foaming process from opening.

Steam through the mold wall hole or slot directly into the cavity surface and particle thermal softening, particle bubble hole evaporates into gas and vapor infiltration bubble hole, foaming agent particles further expansion and increase the volume, because of the limitation of cavity space expansion of particle filled cavity space and melt the massing of after cooling to finalize the design, and die out, which is the polystyrene foam plastics.

Steam moulded foam molding of products from the mold after into the chamber (50-60 &#;) and dry, take off products surface moisture.

Particles to expand mutual fused into the overall foaming process occurs in a closed cavity, the space between the particles decreases gradually with the foaming process until disappear, so into the cavity of the vapor flow resistance increases gradually, steam pressure rises to a predetermined pressure value, the pressure value is called moulded foam type pressure, namely the end of the moulded foam molding, closed this time of steam, stop the heating, ventilation with cooling stereotypes.

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Molding pressure is directly related to the density of foam plastics.In addition, the density of foamed plastics depends on the density of prefoamed particles.

Related EPS Machine

EPS(expanded polystyrene) process in detail

EPS, or expanded polystyrene, is a type of plastic foam used in a wide range of applications, including insulation, packaging, and building materials. The EPS manufacturing process involves several steps, which are described below:

1. Pre-expansion: The first step in the EPS manufacturing process is pre-expansion. In this step, small beads of polystyrene resin are fed into a pre-expander machine, where they are heated with steam and expanded to a specific size. The expansion process involves the release of pentane gas, which causes the beads to expand and fuse together.
2. Aging: After pre-expansion, the expanded polystyrene beads are left to age for several hours. This allows the beads to cool and stabilize, and ensures that they are ready for the next stage of the process.
3. Molding: The next step is molding. The aged beads are placed into a mold and heated with steam, causing them to expand further and take the shape of the mold. The mold can be designed to produce a variety of shapes and sizes, depending on the intended application of the EPS foam.
4. Cooling: After molding, the EPS foam is cooled with air or water. This process helps to set the shape of the foam and prevent it from deforming.
5. Cutting: The final step in the EPS manufacturing process is cutting. The foam is cut into the desired shape and size using hot wires, saws, or other cutting tools. This allows the EPS foam to be customized for a wide range of applications.

Overall, the EPS manufacturing process is highly automated and produces a versatile and lightweight material that is ideal for a wide range of applications.

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