{"id":2642,"date":"2026-09-28T10:28:19","date_gmt":"2026-09-28T08:28:19","guid":{"rendered":"https:\/\/www.bagmatic.com\/kleinteile-automatisch-verpacken\/"},"modified":"2026-10-01T06:32:02","modified_gmt":"2026-10-01T04:32:02","slug":"automatic-small-parts-packaging","status":"publish","type":"post","link":"https:\/\/www.bagmatic.com\/en\/automatic-small-parts-packaging\/","title":{"rendered":"The Exact Count in the Bag: Small Parts Packaging That Adds Up"},"content":{"rendered":"

The delivery note says fifty screws, the bag holds forty-eight. In small parts packaging the blame usually lands on the scale, although the error is created one station earlier.<\/p>\n

Small components behave differently in bulk than standard goods, and that behaviour decides whether the quantity in the bag adds up. This article sorts out the three common counting methods, shows what disturbs the feed and explains what accuracy really depends on in daily operation.<\/p>\n

<\/p>\n

Why Small Components Follow Their Own Rules<\/h2>\n

A missing part rarely shows up in your own plant. It shows up at the fitter who opens the set and finds one screw short. That complaint costs a multiple of the part value. Frustration stays with the sender.<\/p>\n

With standard goods the format determines the machine. With small components the behaviour of the bulk determines almost everything. Four properties make the job difficult. Parts interlock, they pick up an electrostatic charge, their unit weight varies more than expected. On top of that come shiny or transparent surfaces that are hard to tell apart optically. Every one of these properties attacks exactly where the counting happens.<\/strong><\/p>\n

That leads to the thought this article rests on. Companies looking into small parts packaging rarely have a packaging problem, they have a quantity problem. The bag is the easy part.<\/strong> Counting technology and bag packaging therefore belong to one task at BagMatic, not to two separate machines.<\/p>\n

Three Ways to Handle Small Parts Packaging and Count Accurately<\/h2>\n

Before a small parts packaging line runs, the choice between three counting methods comes first. None of them is better in principle. Each has a range where it beats the others, plus a limit beyond which it turns unreliable.<\/p>\n

Weight counting works from a reference piece weight. A known number of parts is weighed, which gives the mean unit weight. Every further quantity is then calculated back through mass. The method is fast, inexpensive and completely independent of the shape and colour of the part.<\/strong> It stands or falls with how uniform the parts are.<\/p>\n

Optical counting captures each part individually through image processing. It recognises shapes, tells variants apart and reports foreign parts that have no business being in the bulk. That way it checks not only the number but also whether the right item is in the bag. Mechanical singulation, in turn, guides parts past a sensor one by one through discs or channels and needs no camera, but it demands a narrow part geometry.<\/p>\n\n\n\n\n\n\n\n\n
Method<\/th>\nWorking principle<\/th>\nStrength<\/th>\nLimit<\/th>\n<\/tr>\n<\/thead>\n
Weight counting<\/td>\ncalculation back from the reference piece weight<\/td>\nfast, independent of shape and surface, low cost to set up<\/td>\nvarying part weights distort the result<\/td>\n<\/tr>\n
Optical counting<\/td>\nimage processing captures every part individually<\/td>\nrecognises shape and variant, finds foreign parts, handles very small items<\/td>\noverlapping, shiny or transparent parts need effort<\/td>\n<\/tr>\n
Mechanical singulation<\/td>\nparts pass a sensor one at a time<\/td>\nrobust, simple technology, easy to verify<\/td>\nonly with narrow, uniform part geometry<\/td>\n<\/tr>\n
Weighing with optical check<\/td>\nmass counts, camera verifies<\/td>\ncatches both error patterns<\/td>\nhigher effort in setup and commissioning<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

When Piece Weight Is a Sound Basis<\/h3>\n

With turned parts, standard screws and nuts from one production run, the unit weights sit close together. If you source such parts in consistent quality, small parts packaging can determine the quantity through weight alone, even at higher counts per bag. As soon as parts from different batches or tools are mixed, the margin narrows.<\/p>\n

One ratio tells you most of what you need to know. The smaller the unit weight in relation to the total quantity in the bag, the more sensitive the method becomes to scatter.<\/strong> With two hundred tiny parts per bag, a weight deviation hits very differently than with ten solid ones.<\/p>\n

What Optical Counting Adds<\/h3>\n

Cameras do not just count, they see.<\/strong> That is how you notice a bent part, a wrong variant running along or packaging material that ended up in the bulk. For sets made of several components this is often the real reason why companies move their small parts packaging to an optical check.<\/p>\n

Setup is where the effort sits. Lighting, background and distance have to suit the part. Overlapping items additionally need clean singulation upstream. Once that is settled, the method runs very stably.<\/p>\n

The Feed Decides Whether the Cycle Stays Even<\/h2>\n

No counting method is better than the stream of parts it receives. For small parts packaging to work at all, feeding technology<\/a> has to turn unordered bulk into an even, singulated flow first. The common approach is the micro-throw principle, where parts travel upwards in a spiral through fine vibrations and get aligned on the way. If that stream stalls, every downstream system measures nothing but gaps.<\/strong><\/p>\n

In practice it is the same disturbances that make the cycle irregular:<\/p>\n