What Do Colored Squares on Toothpaste Tubes Mean? The Truth Behind Eye Marks
Have you ever paid attention while shopping at the supermarket? From chip packets to detergent boxes, nearly every package contains small lines, dots, or geometric shapes. Most people assume these are indicators of the product's natural or chemical content, but their actual purpose is entirely different.
These signs are actually referred to as "registration marks" or, in technical language, "eye marks".
According to the International Association of Packaging Industry, thousands of products are processed every minute on modern production lines, each requiring precise cutting, folding, or filling.
Optical sensors working on factory belts read these minute markers, providing machines with crucial information. In the production of chip packets, the sensor issues a 'cut here' command when it spots a black line. Meanwhile, a dot on a detergent box signifies 'start folding here'.
According to research conducted by the Packaging Technology Institute, the error rate could potentially escalate up to 15% in the absence of this system.
On a production line that churns out 2000 units per minute, pinpoint precision down to the millisecond is required to ensure each product is cut from the right place.
These markings, which are challenging to discern with the naked eye, are easily detected by infrared or laser sensors. In the event that a sensor fails to read the mark, the machine automatically comes to a halt, thereby preventing faulty products from entering the market.
Each geometric shape carries a distinct meaning.
A triangle is typically used to signify the 'start of filling', a square marks the 'label application point', and a circle represents the 'final inspection'. Their colors are not chosen randomly, as darker shades are more clearly detected by sensors.
You may notice multiple symbols on some packaging. This is because different stations on the production line require different instructions.
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