2022.07.12
The EPS foaming machine must first foam this step:
1. EPS foaming machinery injects gas into liquid or melt plastic to form micropores.
2. There is a certain volume to promote the growth of micropores.
3. The EPS foaming machine fixes the microporous structure by physical or chemical methods. According to the method of introducing the gas flow, physical method and chemical method.
EPS foaming machine mechanical method: A large amount of air or other gas is introduced into the liquid plastic through strong stirring. In the industrial field, urea-formaldehyde foam is mainly produced in this way and can be used for thermal insulation materials or sets in film and television dramas. Such as our common artificial snowflakes.
The physical method of EPS foaming machine: Dissolve low-boiling hydrocarbons or halogenated hydrocarbons in plastic, the plastic will soften when heated, and the mixed liquid will expand and foam. For example, when polystyrene foam is styrene suspension polymerization, pentane can be dissolved in the monomer first, or pentane can be polymerized into bead polystyrene resin under pressure to make so-called polystyrene foam balls . These beads are prepared to be foamed in hot water or steam, and then put into a mold, through the steam, the pre-expanded particles are secondary expanded and melted with each other, and after cooling, a product with the same shape as the mold cavity is obtained. It is often used as a shockproof material in thermal insulation and packaging. The extrusion molding method can also be used. At this time, foam beads can be used to extrude the foam into sheets at one time; ordinary polystyrene particles can also be used, and halogenated hydrocarbons can be added to the appropriate parts of the EPS foam extruder to melt them with the plastic. The body mixes well, and the foam expands as the material leaves the handpiece. Extrusion is commonly used to make sheets or boards, which can be vacuum-molded into food boxes and trays. Polyethylene can also be used in a similar way to make extruded foam products. Physical methods for introducing gas include dissolution method, hollow microsphere method, etc. The dissolution method is to mix soluble substances such as salt and starch with resin to form a product, and then repeatedly process it in water to dissolve the soluble substances, that is, to obtain an open foam product, which is mainly used as a filter material.
Tel:
English 
