REUSE: bad label, bad glue: how to avoid that residual label and glue does not contaminate the inspection?

Consigne Etikett 1

Apo 0,75 L after washing – bad glue:
the glue for labelling is not suitable for reuse
since it cannot removed with standard washing procedures.
Residual glue will contaminate all subsequent railing and devices.

consigne Etikett 2

Apo 0,75 L after washing – bad label:
the plastics foil as label was manually removed after washing so the glue appears.
Residual glue will contaminate all subsequent railing and devices.

The fundamental change from single use to reuse affects many process steps, also the labelling. Formerly, in the reuse regime, a later remove of the label and glue was not to be taken into account. In a reuse circle, an inappropriate label or glue results in residual parts of it after the washing! In consequence, railing, inspection devices, robots e.g., for palletization will be contaminated.

That means such bottles should be rejected right after washing!

Our evaluation based on a series of washed bottles with residual glue and label was conducted with the miho Multicon 3 infeed control as part of the empty bottle inspection miho David 2. Bottles were checked under dry and wet conditions.

As a result, a bottle with label, glue, or other type of stains covering about 2/3 of the circumference can be securely detected and thus rejected before entering the empty bottle inspector.


REUSE: Sorting of “identical” bottles only by variation of the height of the dome

Bordeaux 0,75 L of glass manufacture A – lower dome

Bordeaux 0,75 L of glass manufacture B – higher dome

Taking the Bordeaux 0,75 L bottle as an example, different bottle manufactures use slightly varying designs. This way, the nominal filling volume of 750 mL leads to filling levels of different heights! In the REUSE world, a mixture of “identical” bottles causes problems when refilling.

Our evaluation took the different heights of the dome as possible pattern for discrimination into consideration. The empty bottle inspector miho David 2 with its modular design and high level of flexibility allows to securely discriminate such bottles while inspecting the side wall.


Innovation: thermally tempered lightweight glass for returnable bottles – no restrictions to worry about during empty bottle inspection

verspanntes glas flasche
Source: Yumda

Vetropack, as a manufacturer of glass packaging, has introduced the world’s first returnable bottle made of thermally tempered lightweight glass at Drinktec 2022. The advantages are low weight and less wear and tear, resulting in more turnarounds. Fortunately, empty bottle inspection shows no limitations in inspection accuracy, for example due to polarization effects, which was to be feared due to the special material structure.


REUSE: Sorting of “identical” bottles only by 2-mm-variation of the finish width


The bottle discrimination by the finish diameter runs securely with the miho Multicon 4. Key prerequisite is to remove the longcap and cleaning the bottle in advance. A measurement with partly attached caps or other closures will not be accurate. However, the sorting of bottles with caps and other closures runs securely. There is no impact by the type of the color: Blue, brown, green.


PAS d’impact de la profondeur de couleur sur la précision de détection de notre Mireuse Bouteille Vide

Pour la gamme de couleur de bouteille testée, la profondeur de couleur n’à pas d’impact sur la précision de détection. L’ensemble des échantillons de bouteilles testées sont inspectées par notre Mireuse Bouteille Vide David 2, avec la même précision. Même la bouteille n° 4, la plus sombre, permet une détection de défauts optimale.

Nous pouvons conclure que ni la couleur, ni la profondeur de couleur n’impactent la capacité de détection de défauts.

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