2022.08.03
The first: is the stomatal uniformity of the material. The more narrow the pore size distribution of the pores, the more common, relatively speaking, the more uniform the EPP foam.
Second: It is the foaming rate of the foam product, which is the method of judging the quality of the EPP foam packaging material from the foaming foam. The foaming rate is too low, the thermal insulation effect is poor, the foaming rate is too high, and the product strength is not good, so as long as a reasonable foaming rate can play the role of both compression and heat preservation, it is a good product.
Another point is that the milky foam cannot be used. The appearance of the foam that meets the technical requirements should be spongy fine bubbles, piled up like white clouds, like bounced cotton, and will not flow chaotically. The water content of this foam is very small, and it is not easy to break, which can prevent the compressive stress from converging at the large cells and reduce the compressive strength.
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