RESPIRATION OF GOLDEN DELICIOUS 
APPLES IN SPECIFIED WRAPS 
MGS. CO, PER KG. PER HR. 
ames Standard pack 
eeeee Polyethylene, 150 
=== Pliofiim, FMI-80 
xem x Pliofilm, HP-100 
A 6 
DAYS RIPENED AT 65° F. 
U.S. DEPARTMENT OF AGRICULTURE NEG. 1140-54 (10) AGRICULTURAL MARKETING SERVICE 
Ficure 9.—Respiration of Golden Delicious apples at 65° F. following previous 
storage until April in various kinds of sealed film. The sealed films were 
broken prior to the measurement of respiratory activity of the fruit. 
FILM PERFORATION REQUIREMENTS 
As demonstrated in this study, severe injury to the packed fruit can 
occur even at 31° F. from the use, as box liners, of sealed films that have 
limited rates of gaseous diffusion. Destruction of flavor and tissue 
discoloration are produced as a result of CO, gas injury or the lack of 
sufficient oxygen to support the normal respiration of the fruit. 
Sealed films such as cellophanes 300 and 450 MSAT, and Plhofilms 
120P4 and 120P6 should never be used without suitable perforation for 
pears and apples even at 31° F. Cellophane 300 LSAT and Phofilm 
75 FF and 100 HP may be used with safety as sealed box liners for 
pears and apples provided the liners are perforated immediately upon 
removal from cold storage. 
The more gas-pervious films such as Pliofilm 80 FM1 and 80 HP, and 
polyethylene 100- and 150-gage can be used with safety as sealed film 
box liners for pears and Golden Delicious apples at 31° F., and for 
limited periods at ripening temperatures. There isa margin of safety 
of at least 4 days in handling such film-packed fruit even at room 
temperatures of 65° to 70° F. “Tn order to avoid possible injury to the 
fruit during uninformed retail handling, it is strongly recommended 
that the sealed film of all packed fruit be perforated or slit open at 
shipping point. Nearly maximum protection to the fruit from the use 
of the sealed liner during previous prolonged storage will already have 
been attained by this time. 
24. 
