Over the years labeling technology has advanced so that most labels are now self-adhesive; they are attached to a large roll of slick surfaced paper, which is then loaded into the labeling machine at the point of application. The slick surfaced paper allows the label to be easily peeled off the roll and onto the bottle. Even though the self adhesive label is more expensive, it eliminates the separate glue station and related maintenance. In the end, it’s less cost per label.
There are several layers of complexity when it comes to labeling a bottle; the easiest is one that involves just one label, and no requirement for orientation (I.E. application of the label can be anywhere on the circumference of the bottle). Then comes the bottle that has a specific area for the label; this will require a mechanical device to orient / line up the bottle to the labeling magazine. Then comes the double label bottle, where there will be two magazines, each with there own roll of labels (front / back). There are variations of bottle designs which may require rotation of the bottle during labeling (if the label is a full wrap). Another fairly recent advance is the heat shrink neck band that is used to prevent tampering. This item is slipped onto the top of the bottle, and shrunk on using a heat source, usually steam. No adhesive required.
One of my first jobs at New Jersey Machine was to work on an experimental hot glue labeling machine. Hot glue is a very “aggressive” adhesive (it sticks items together almost instantly). Hot glue is used extensively for beverage containers where items move quickly thru the line (I.E. your beer and soda six-packs). But hot glue is dangerous; the results can be severe burns from contacting the glue on skin surfaces. Product development time is long, because adjustments to the machinery cannot be made quickly (the machine must cool down before the mechanics can work on it). In the end, this project was abandoned.
Besides the product labeling line, New Jersey Machine also had a line of boxing machines. These machines took a product and inserted it into a carton / box; many of our customers were candy makers (Hershey, Mars as an example). Although the public buys candy bars individually, they are sold wholesale to stores in boxes of 10 or 20. When a machine runoff was scheduled, the customer would send us hundreds of candy bars to use to set up and run off the machine for acceptance. After run off, these candy bars could not be sold, so they would be given to the employees (one of the benefits of working there). I remember bringing a big bag of candy home around Holloween time; we didn’t have to buy any that year.
An explanation: A “machine runoff” takes place after the machine has been built. This is when the customer comes into the plant and observes the actual performance of his machine. Usually a somewhat tense time, because if the machine does not operate to their expectations, they may not accept it; it means more time (and costs) will be needed to fix whatever they feel is deficient (I.E. less profit for us).