2022.05.11
At present, it is commonly used in various instruments and packaging blocks for various light industrial products. Most of them are made of EPS compressed foam. It can be directly formed into the shape corresponding to the package and has reliable shock resistance, heat insulation and pressure resistance. and other features. The molding process of eps plastic packing pad can be carried out on a hydraulic press. When molding, the cylinder that drives the hydraulic press closes the mold, and starts the action at low speed, high speed, and low speed closing, leaving a gap in the mold closing, and locking is accomplished by adjusting the cylinder.
When feeding, first open the exhaust port and blow the mold cavity with air. After preheating the mold cavity with 0.1-0.2MPa steam for 30 seconds, the EPS is fed into the mold cavity with a feeding spray gun. The entrained air is expelled through the air vent and the gap left by the closed mold. After feeding, the mold was closed and then heated in an air chamber with 0.1-0.2 MPa steam for 10-30 minutes. The EPS expands and fills the mold cavity. The cooling water is sprayed on the mold wall to cool, and then the product is released from the mold and sent to the drying room, dried in hot air at 50-60 ℃ for 24 hours, and solidified and shaped.
eps foaming machine This foamed plastic paper or sheet has a fine cell structure and glossy surface, light and soft, with thermal insulation and waterproof properties: it can be used as a decorative material; it can be made into trays, cups and various types by vacuum forming Containers, snack boxes, etc.
eps foaming machine This formula makes the extruded foam paper or sheet have a fine cell structure, and citric acid and sodium bicarbonate are added to the formula as nucleating agents. The powdered nucleating agent can be uniformly distributed in EPS. On the bead surface, avoiding interactions, usually add oily substances such as liquid paraffin, silicone oil or dioctyl phthalate, or add stearic acid, starch and other powdered substances to separate them from each other. In addition, various other additives can be added; in order to obtain foam paper or sheets of different colors, dyes can be added.
During the molding process of the eps foaming machine, the prepared materials are added to the silo and continuously extruded by the extruder screw. The foam is continuously extruded from the die in the head and blown into a cylindrical shape. The paper or film is pulled and pressed in a chevron pattern. The extruder generally adopts a single-screw extruder, the length-diameter ratio (L/D) is (18-20):L, and the compression ratio is (2-4):L.1. The compression ratio should be properly controlled, not too large or too small, too large will cause the foaming agent to escape from the funnel, too small will cause bubbles due to the too small pressure of the foaming agent in the barrel; between the screw and the barrel The gap of the screw should be small; the head screw is torpedo-shaped, which can improve the mixing effect and prevent the pulsation of material flow: the expansion ratio is (3-6): L, and the pulling speed is fast, and the extruded foam is cooled under the action of blowing force , which orients the polystyrene macromolecules along the channel. The ion direction improves the mechanical strength of the product.
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