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30 BULLETIN 1335, U. S. DEPARTMENT OF AGRICULTURE 
dry, cool, and well ventilated (fig. 10). The doors should fit tight, © 
and the windows should be covered with fine mesh screen to exclude 
dust and insects. An abundance of light assists in detecting the 
presence of insects and in keeping the room clean. 
The types of containers chosen for packing will depend largely 
upon the severity of the storage conditions, with particular refer- 
ence to the humidity and chances of insect infestation. An ideal con- 
tainer would be one which, while moderate in cost, would keep the 
product from absorbing moisture when exposed to the most severe 
conditions of storage and shipment and would be impervious to 
insects. Only sealed tin cans and glass jars give absolute protection 
against moisture absorption and insect infestation. Friction-top 
cans are nearly as good. Tin containers, necessary for export ship- 
ments of dehydrated foods, are more expensive than paper containers. 
Wooden boxes are generally used for bulk goods. ‘‘ Liners” of heavy 
Fic. 10.—A packing room, with packing tables and conveyors, storage bins, and mixing and package, 
filling machinery 
paper or cardboard, and sometimes additional liners of waxed paper, 
are used. | | 
All types of paper containers with which experiments have been 
made allow the absorption of moisture when the products are stored 
in damp places. Also paper containers do not give perfect protec- 
tion against all insects, some of which can bore hate in paper con- 
tainers, while the larval forms of others are so small that they can 
crawl through the slightest imperfections at the joints where the 
cartons are sealed. Most products, however, keep satisfactorily 
in paper containers made of moisture-proof material and carefully 
sealed and preferably lined or wax wrapped, provided the initial 
mute content is low and no live insects in any form enter the 
ackage. 
E ihe awa heavy paper cartons designed for fancy grades of 
food hold from a few ounces to a pound or more. The general styles 
are rectangular or cylindrical, both of which may be packed with 
or without “liners” and with or without waxed wrappers. LKach 
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