Plastic Pouches Supported by a Box (Bag in Box)
By using a paperboard box to provide support to the plastic pouch containing the fluid product, packagers are able to leverage the bag-in-box system for filling much higher quantities of products than an unsupported pouch system can accommodate.
Currently, individual bag-in-box packages that contain up to 330 gallons of liquid products, which primarily consist of foods, are being utilized. The packager benefits from significant savings through these light weight packages.
During the process of bag-making, the bag-in-box package contains a plastic bag attached using a spout, which, is assembled as an important component of the bag. After the spout fills the bag with liquid, atypically as part of a different procedure, it is subsequently capped off using a molded plastic valve via which the liquid contents can be dispensed at a later stage.
Generally, the bag is essentially a lamination comprising of two distinct films. One of these is an inner layer which establishes contact with the food contents, whereas the other one provides the necessary barrier to gases.
While packaging liquid foods inside such containers, it becomes important to use machinery that is specifically designed for providing sterile conditions. To this end the inside portion of the bag is sterilized by the heat generated during the process of making bags.
Capping off the bag while it remains hot allows these conditions to be maintained. Meanwhile in cases when the bag is filled during a distinct operation that is not part of the bag-making process, chlorine or steam must be used to sterilize its outer surface. On the other hand, if product filling, bag making and film making are all undertaken within the same operation, the heat created during the process of film-making is strong enough to get the entire bag sterilized.