Views: 0 Author: Site Editor Publish Time: 2022-05-06 Origin: Site
The EPS foam molding process is an integral part of the production of a variety of products. Unlike other plastics, EPS foam contains almost 98% air in its final form. Once the polystyrene beads are stabilized, a blowing agent (typically Pentane Gas) is injected into the resin. When this gas is heated to 212 degrees, it expands and causes the beads to become softer. Pressure then causes the beads to merge together, forming a single block of EPS. The steel mold is then opened to reveal the resulting block of EPS foam.
EPS foam molding involves a heat cycle to expand the EPS beads and fuse them into the product. Compressed air is drawn through core vents 4 in the mold surface 43 to exert pressure on the molded article 99 and dislodge it from the mold. As the EPS foam begins to harden, the process is repeated to form new beads. The process is repeated several times for the molded article, depending on the desired thickness.
As EPS contains 98% air, it provides excellent thermal insulation. Its closed-cell structure also helps it retain a high degree of heat. The dimensional stability of EPS foam is also exceptional. The largest change recorded in its dimensional stability is just over 2%. In addition, EPS foam does not retain moisture, allowing water to penetrate only the smallest channels. The resulting product is ideal for industrial machinery transportation.
EPS foam molding process begins by purchasing raw material. The raw material is typically a resin or a styrene bead. This bead is then in a sealed air-tight bag to stabilize. The beads are then molded into large blocks, or custom shapes. EPS foam molding process involves a stringent quality control throughout. A high level of consistency in EPS manufacturing is essential to ensure a product that will last a long time.
The polymer chain of EPF is a linear, organic material that has a high molecular weight. The molecular mass of an EPF molecule is 104. It can vary between 200,000 and 300,000. It is subject to numerous tests, including those conducted by the American Society for Testing and Materials. Some of these tests are used to measure the properties of other plastics. The mass of EPF is not readily determined, but it can be calculated.
Once the product has been molded, the process will be tested for strength, flammability, and resiliency. The molded EPF product will be tested for resiliency, flammability, and porosity. The porosity test involves measuring the number of open and closed cells within the product. The surface area of the product is also measured to determine the permeability of the product. A pre-expanded piece of EPF is placed in a substance to determine how much of the substance it can withstand.
EPF is a polystyrene plastic that is very versatile. The polymer is made by placing small beads of the polystyrene inside a mold and inflating them with a blowing agent or steam. This process causes the polystyrene beads to expand nearly four thousand times their original size. The resulting polystyrene foam is extremely flexible and can be used in many industries, including food packaging.