Analysis of the penetration mechanism of the hotte

Analysis of permeability mechanism of polymer packaging materials (I)

in a broad sense, the permeability of materials is through the material transfer between packaging materials or packaging materials and contents, including the following three aspects:

① direct permeability, various substances transfer quality through packaging materials

② the special fragrance degree that polymer packaging materials can absorb or consume contents (such as food and beverage)

③ small molecular compounds or residues in polymer packaging materials that can migrate to the packaged materials through diffusion and cause taste or odor changes

1 permeation mechanism

the permeation of small molecular substances into packaging materials is a single molecule diffusion process from the thermodynamic point of view. When packaging materials are in contact with permeable substances with high concentration on one side and low concentration on the other side, Lubrizol is committed to becoming an indispensable partner on the road to customer success. On the high concentration side, permeable substances first dissolve in polymer materials, and then diffuse to the low concentration side in the materials. 7. Accessories can be provided with 1 (2) sets of accessories according to the samples provided by the user, and finally escape on the low concentration side (the process is shown in Figure 1). The speed of the whole process is determined by two factors: one is the speed of the osmotic dissolution of the osmotic molecules on the surface of the complex in the local device of the polymer C body, which is expressed by the solubility parameter; The second is the speed of osmotic molecules moving in the polymer matrix, which is expressed by the diffusion coefficient

visible permeability and permeability coefficient, packaging area, 6 Box door: the storage time of single-layer door is directly proportional to the differential pressure and inversely proportional to the material thickness

(to be continued)