Foam packaging box is the abbreviation of Expanded polypropylene, which is the abbreviation of a new type of foam plastic. EPP is a polypropylene plastic foam material. It is a highly crystalline polymer / gas composite material with outstanding functions. With its common and superior function, it has become the fastest-growing new type of environmentally-friendly compression and heat insulation data. Let's take a look at the foaming problem of EPP data packaging products.
(1) The research on the dynamic rheological function of linear epp data / nano-clay composite data indicates that the nano-clay can be introduced into the polypropylene foaming system through the "melt intercalation method", which can effectively advance the melt elasticity of linear polypropylene. "Melted intercalation method" is expected to become a high melt strength polypropylene material. Low EPP data. What are the foaming problems of packaging products? According to the cost preparation method, the linear polypropylene / nano-clay composite material can become an outstanding polypropylene extrusion foaming system.
(2) The shear viscosity of the LcBePP / nano-clay composite system has a high temperature sensitivity. As the temperature increases, the apparent shear viscosity decreases significantly. In the low shear rate region, the apparent shear viscosity of the LCBPP / nano-clay composite system is lower than that of the LPP and (LCBPP / LPP) / nano clay composite systems, but in the high-shear region, the shear viscosity of the three tends to be closer .
(3) In the presence of long-chain branched polypropylene, the addition of nanoclay did not significantly affect the product behavior and crystal shape of polypropylene / nanoclay composite materials.
(4) The "sandwich" structure of the "sandwich" model formed by the introduction of nanoclay into linear polypropylene has the effect of physical cross-linking points, usefully advancing the melt strength (melt elasticity) of linear polypropylene. As the strength of the melt advances, the increase of bubbles during the foaming process is stabilized. The polypropylene melt can effectively resist the effect of increasing the tensile stress in the process of bubbles, and the bubbles are not easy to break.
(5 foam packaging box) Due to the useful gas barrier properties of nano-clay, it can prevent the looseness of gas molecules between bubbles and into the atmosphere, and then effectively avoid the bubble depression during the increase of bubbles in epp products.