There are various needs for rejecting products in a production line such as improper weights and fills, incorrect or missing graphics, downed containers and unreadable or missing UPCs. In food processing, rejecting is also used for improper weights and fills, incorrect graphics, but also for incorrect product shapes and waste recycling.
Product rates, sizes and weights are the top criteria for assessing the best type of rejecting solution. Packaging applications with slower rates have many options which could be a simple mechanical solution such as a downed bottle rail. In other rejecting situations, machines such as checkweighers or leak testers send a signal to reject the product or package.
Rejecting systems can be pneumatic, electric based or servo-driven. Tracking sensors can identify the reject of an individual item or a group of items.
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Misoriented packages simply drop out of the conveyor, while correctly oriented packages are conveyed on the urethane belts.