Density, transparency and water absorption of food packaging bags

In addition to mechanical properties, thermal properties, permeability, and chemical properties, polymer materials for food packaging bags also have density and transparency. 1. Density of food packaging bags The density of food packaging bags is a function of the quality of individual molecules per unit volume and the way they are stacked. Recreational hydrogen compounds are composed of light atoms and therefore generally have a lower density. The density of simple hydrocarbon polymers-polyethylene, polypropylene, and polystyrene is 0.9? 丨.Ig/cm3. Substituting heavier atoms such as fluorine or chlorine atoms to transfer hydrogen can produce polyvinyl chloride with a density of 1.2~1.5g/cm3 and polytetrafluoroethylene with a density of 2.1 to 2.28/0^. The density of polyoxymethylene is higher because the C-0—C bonds are stacked more closely. Crystalline polymers are always denser than amorphous polymers because they are denser and denser. The density can reflect the composition, structure and crystallinity of the polymer. 2. Food packaging bag transparency Food packaging bag transparency is the ratio of the luminous flux M through the object to the total incident luminous flux: the ratio, also called the light transmittance, sometimes measured with light in a certain wavelength range. , Density difference is electrically important for determining transparency, because the refractive index is always proportional to the density. If the density of the amorphous material is similar to that of the crystalline material, the light will be slightly scattered when passing through the mixture of these two structures, and the material will be transparent; on the other hand, if the density of the two is very different, it will be opaque. For example, in polyethylene, the density difference is relatively large (the relative density of the amorphous state is 〇8 and the crystalline state is therefore, in the case of obvious crystallization, the material is opaque. And the density of propylene is small (the relative density of the amorphous state is It is 0.85, and the crystalline state is 0.94>,^u0026^ However, if the polymer crystal material is rapidly cooled, the crystals obtained are so small that they are shorter than the wavelength of the light to be transmitted. The material can be transparent. 3. Food packaging bags Water-absorbent food packaging bags. Immerse a sample of a specified size in distilled water at a certain temperature (25 feet or 20: t 2 feet). After 24 hours of measurement, the weight gain is usually expressed as a percentage of weight gain , Called the water leakage rate. It can also be expressed by the water absorption per unit area (〇^/〇112 or #100^112) or the weight gain (mg).
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