Agriculture Reference
In-Depth Information
Table 7.1.
Permeability of PE- and PP-based films: neat PE/PP, developed films with enhanced gas permeability, and commercial films
for fresh produce.
Transmission Rate (cm
3
m
−
2
day
−
1
)
Permeability (cm
3
mm m
−
2
day
−
1
atm
−
1
)at23
◦
C, 0%RH
WVTR (g m
−
2
day
−
1
)at
38
◦
C, 90% RH
PCO
2
/
PO
2
(
Film Description
Thickness (μm)
OTR
PO
2
CO
2
TR
PCO
2
β
)
LDPE
1
>
>
PE
25
800
20
42,000
1,050
18
—
HDPE
2
25
2,600
65
7,600
190
7-10
2.9
Neat LDPE
2
(chilled air cooling)
30
7,500
220
22,000
660
9
2.8
Neat LDPE
3
(normal air cooling,
produced by manufacturer)
37
4,450
165
12,465
492
3
3.0
LDPE/EVA blends
2
(90/10)
28
11,561
324
—
—
8
—
Inorganic particle-filled
LDPE/CaCO
3
27
12,567
339
—
—
7
—
2
(95/5)
Ceramic filled LDPE
4
∗
PO
2
,
25
—
199
—
882
—
4.4
PCO
2
at 10
◦
C
EMA film
5,6
based on PE blends
28
11,000
300
34,500
950
15-20
3.2
Metallocene
3,5
PE (mPE)
30
15,000
450
50,000
1,500
20-25
3.3
PP cast
1
PP
25
3,700
93
10,000
250
10-12
2.6
OPP
1
25
2,000
50
8,000
200
6-7
4.0
BOPP
7
(produced by
manufacturer)
25
1,500
38
3,300
83
5-6
2.2
Micro-perforated BOPP
8
(with
25
1,600-50,000
40-1,250
3,500-40,000
88-1,000
15-70
0.8-1.0
varying pore quantity)
Porous PP membrane
9
(stretched
PP with controlled crystal
structure and stretch ratios)
2,500-1
×
10
6
50-100
40,000-
10
×
10
6
40,000-
4
×
10
6
2,500-40,000
12-400
0.2-1.0
Commercial film-1
10
n/a
>
15,500
n/a
n/a
n/a
n/a
n/a
Commercial film-2
11
(plastomer/VLDPE)
>
25
13,175
329
n/a
n/a
n/a
n/a
Commercial film-3 proprietary
(ceramic-filled film, Japan)
45
11,000
495
20,000
900
7
1.8
OTR: oxygen transmission rate (ASTM D3985); PO
2
, oxygen permeability; CO
2
TR, carbon dioxide transmission rate (ASTM F2476); PCO
2
, carbon
dioxide permeability; WVTR, water vapor transmission rate (ASTM F1249); VLDPE, very low density linear PE. Data are from
1
Greengrass (1999),
2
Chinsirikul et al. (2002),
3
Chinsirikul et al. (2008b),
4
Yam et al. (2005),
5
Chinsirikul et al. (2008a),
6
Fuongfuchat et al. (2008),
7
Chinsirikul et al. (2009),
8
Kerddonfag (2008),
9
Kerddonfag (2007),
10
Zagory (1997),
11
Ward et al. (2007).
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