What Are Caustic-Soluble Labels?
Caustic-soluble labels, also known as alkaline-soluble labels, can be removed from the product without leaving any residue*. However, to ensure that the alkali-soluble adhesive can be completely removed again, a few aspects must be taken into account:
1. Proportion of Ink, Protective Varnish and Hot Foil Stamping
Components such as hot foil stamping, varnish or printing ink seal the label’s surface and make it difficult for the caustic solution to penetrate the paper’s fibres to dissolve the adhesive. The primer that is necessary for the printing ink also seals the surface of the material. So, the higher the proportion of components on the caustic-soluble label, the harder it will be to detach. Please note: Self-adhesive caustic-soluble labels, must do without varnish or film lamination. Furthermore, it is advisable to screen out the fonts and not to incorporate large hot foil stamping areas in your design.
2. Bottle Rinsing/Lye Bath
The lye bath you use to remove the caustic-soluble labels must have a lye percentage of at least 1.2-1.5 to guarantee a residue free removal. The bath’s temperature should ideally be +80°C. A higher percentage of lye or higher water temperatures will interfere with the removal process. Leave the caustic-soluble labels in the lye bath for at least ten to fifteen minutes. Unprinted labels with alkaline-soluble adhesive may already peel off after only one minute. The properties of the caustic-soluble label’s paper as well as the above-mentioned treatments of the surface can influence and possibly extend the peeling time.
3. Storage of Used Glass
Proper storage is a prerequisite for the removal of caustic-soluble labels from used glass. Optimal storage is ensured in a dry area protected from effects of the weather. Rain, for example, can cause the adhesive to dissolve and then dry, resulting in permanent adhesion. Basically, the longer the empty containers are stored, the more difficult it is to remove the caustic-soluble labels later. If stored properly, label.co.uk guarantees optimal adhesion for about 12 months after production. However, due to the different influencing factors and material properties, we cannot give a guarantee for removability.
Free Sample Book
With our free sample book, you can get an overview of standard materials and finishing touches and thus convince yourself of our excellent printing quality. We would also be happy to put together individual samples for you. Simply use our contact form to reach out to our customer service and let us know which materials you are interested in.
Our Design Service for Labels
You would like to have your current label design revised? You already have an idea of what your caustic-soluble label should look like, but don’t have the technical know-how to implement the design creatively? You don’t even have a specific idea of your label’s design yet? No problem. Our unique design service offers you the possibility to have your label designed by our professional graphic designers – entirely according to your individual wishes and specifications – and later implemented by our own manufactory.
*label.co.uk cannot guarantee that the labels will be removed without leaving any residue. The above-mentioned factors as well as environmental influences can strongly affect the removability of the labels.
Tools and Services
If you wish to see a press-proof before placing a full custom label order you can book our proofing services.