Transparent label dispensers

A transparent label dispenser is an electronic device that separates each label from its liner and presents it ready to be picked up by the operator. As soon as the label is removed, the machine advances the roll to automatically present the next one. This facilitates repetitive labelling and packaging operations.

The low visibility of a transparent label can make it difficult to detect for a conventional optical system relying on a difference in colour or contrast. A suitable dispenser therefore uses a system capable of detecting the presence of the label in other ways to ensure a steady feed and avoid dispensing errors.

The detection system depends on the model. Some dispensers use a mechanical sensor that physically detects the passage of the label. Others analyse the difference in thickness between the label and its liner using an electromagnetic sensor. These solutions allow operation without relying solely on the colour or contrast of the substrate.

A dispenser for opaque labels can generally use a standard photoelectric cell to distinguish the label from its backing. For a transparent label, mechanical, electromagnetic, or specially adapted detection may be necessary. Some versatile dispensers accept both types of labels, but this compatibility must be checked for each model.

The choice mainly depends on the width and length of the labels, the outer diameter of the reel, the diameter of the core, and the desired speed. It is also important to consider the detection system, the presence of a counter, the feeding mode, and any potential need to dispense particularly wide or long labels.

Yes, some dispensers are designed to accommodate large width labels and reels. However, the capacity varies by model. It is necessary to check the maximum accepted width, the diameter of the reel, the length of the labels, and the guiding system to ensure smooth unwinding and correct presentation.

It is advisable to check the dimensions of the label and the reel, the winding direction, the spacing between labels, the thickness of the liner, and the ease of peeling. DERFI can conduct a test with the actual roll used to check detection, liner separation, and the regularity of dispensing.