TABLE OF CONTENTS Inhibited films can be classified by the following criteria: (1) origin of the chief component (polymer base), (2) film structure, (3) CI type, its aggregate state and distribution pattern in the film; (4) designation of the film material (Fig. 2.1).
There are more than a dozen types of preservative films [3] discriminated by the polymer base that governs the physical-mechanical characteristics of the films (Table 2.1) [1], [9], [10], [11].
| Film Base | Thickness d, ?m | Density, g/cm 3 | ? b, MPa | ? b, % | Elasticity Modulus, 10 ?3 MPa | Heat-Resistance, C | Frost-Resistance, C | Moisture Absorption in 24 h, % | Permeability to Oxygen, 10 ?7 m 3/(s.m 2. Pa) | Permeability to Vapors (d = 25 ?m; 38 C; 90% H 2O), 10 ?4g/(s.m 2) |
|---|---|---|---|---|---|---|---|---|---|---|
| PE | 10 300 | 0.919 0.965 | 10 50 | 100 1000 | 0.1 1.0 | 70 120 | from ?40 to ?70 | 0.01 | 300 1150 | 0.5 2.0 |
| PVC: | ||||||||||
| ? rigid | 50 250 | 1.30 1.45 | 45 120 | 5 100 | 1 2 | 70 | ?15 | 0.1 0.5 | 120 180 | 3.0 4.0 |
| ? soft |
| 1.25 1.50 | 14 35 | 200 500 | 0.1 0.5 | 70 90 | ?60 | 0.5 1.0 | 200 300 | 1.5 4.0 |
| PP | 2 400 | 0.90 0.91 | 21 280 | 40 800 | 1.0 4.0 | 130 | from ?15 to ?50 | 0.005 | 170 270 | 0.8 1.4 |
| PET | 1 350 | 1.35 1.40 | 140 290 | 60 140 | 3.4 5.5 | 130 | ?60 | 0.4 0.5 | 10 15 | 2.5 3.0 |
| PA | 12 200 | 1.02 1.15 | 60 350 | 60 450 | 0.6 2.8 | 120 220 | from ?30 to ?60 | 1 9 | 5 60 | 4.0 8.0 |
| PS | 4 500 | 1.05 | 49 80 | 3 8 | 2.7 3.7 |
