EPS foam packing box production process

Abstract

The invention discloses an EPS foam packing box production process. The EPS foam packing box production process comprises pre-foaming, curing and forming procedures, wherein in the curing procedure, EPS foam particles are conveyed to a pressure-loading tank; hot air of which the pressure is 0.4-0.6 kilogram force per square centimeter and the temperature is 35-45 DEG C is injected into the tank body of the pressure-loading tank; the pressure and the temperature of hot air in the tank body are kept unchanged, and the EPS foam particles are stored for 0.5-1 hour; hot air is injected into the tank body again, thereby increasing the internal pressure of tank body to 0.8-1.2 kilogram force per square centimeter; the internal pressure and temperature of the tank body are kept unchanged, and the EPS foam particles are stored for 0.8-1.2 hours; hot air is injected into the tank body for the third time, thereby increasing the internal pressure of tank body to 1.8-2.2 kilogram force per square centimeter; and the internal pressure and temperature of the tank body are kept unchanged, the EPS foam particles are stored for 0.8-1.2 hours, and then the curing treatment is completed. According to the EPS foam packing box production process, a pressurizing and warming mode is adopted for the curing treatment, the curing effect is good, and the cell internal negative pressure recovery rate reaches 99%.

Description

technical field [0001] The invention relates to the field of curing of expandable polystyrene, in particular to a production process of EPS foam packaging boxes. Background technique [0002] In the production process of EPS foam packaging boxes, at present, there is a certain amount of foaming agent and water vapor in the pre-released EPS (Expandable Polystyrene) foam particles at home and abroad. , condenses into a liquid, and the liquid foaming agent dissolves into the EPS cells, the pressure in the bubbles drops rapidly, negative pressure (vacuum state) appears in the cells in the EPS cells, the cells of the cells collapse, and are prone to deformation. In order to make there is no negative pressure in the cells, the EPS cells are usually stored in the silo for at least 12 hours to stabilize the cell pressure. This process of cell pressure stabilization is called aging. The traditional curing process has the following disadvantages: 1. The curing effect is poor, and the...

AI Technical Summary

Problems solved by technology

The traditional curing process has the following disadvantages: 1. The curing effect is poor, and the negative pressure recovery rate in the cells is only 90%; 2. It takes a lot of time, which prolongs the production cycle and is not conducive to changes in production plans; 3. Occupies a large number of silos , a pre-blowing machine needs to be equipped with 3 silos with a volume of 15 cubic meters, and the investment cost is huge

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