Safety & Advice


We understand that problems that arise in production need to be dealt with as quickly as possible to minimise downtime. Interlock Adhesives can provide you with support in different ways including on-site visits, comprehensive troubleshooting guides and phone support. We also work closely with other suppliers in the production process including adhesive application equipment providers and board and paper manufacturers to be fully up to date with the latest technological developments. Our testing laboratory is also on hand to provide expert analysis and help find the right adhesive for you.

Setting your machines correctly is important, we can help provide you with the correct temperature and other settings related to the adhesive application process.

Contact us with any issues you may have and we will be able to help.

Packaging Troubleshooting

Degraded Adhesive – e.g. darkening, charred particles, thickening or gelling, excessive fuming.

Blocked nozzles on hot melt applicators – Blocked glue nozzles can result in little or no adhesive being applied and are a common cause of downtime, smash ups, and product wastage.

Stringing – Stringing is also called ‘candy floss’ or ‘cobweb’. It can build up on the machine causing frequent stoppages and lost production. It can also contaminate the product being bonded.

Poor adhesion – Adhesive is glossy and is only on the surface to which it was applied, adhesive is glossy on both surfaces, but shows solidified ‘legs’, the adhesive has a matt finish, and is only on one surface, but has flattened out in compression etc.

Tram Lines – Tram lines’ are particular to wheel applicators and appear as two beads of adhesive joined by a thin layer in-between, i.e. the edges of the glue line are thick and the middle is thin. This can result in adhesions that look well bonded, but when tested are weak and could fail in transit or subsequent handling.

Labelling Troubleshooting

Wrinkling – Where the label shows a ridged surface.

Slipping – The label slips from side to side.

Smearing – Adhesive is visible on the product itself

Leaching – The adhesive looks to have leaked from under the label.

Flagging – Where part of the label is not attached to the product.

Scuffing – Part of the label is moving to cause creasing.

Staining – The adhesive is visible through the label causing cosmetic issues.

Lack of a label – The label is not applied at all.

Bookbinding Troubleshooting

We can help with graphic arts adhesive issues including:

  • Page pull
  • Ink effect
  • Milling
  • Levelling
  • Fibre Exposure
  • Notching


Other aspects we can help you with:

  • Suggested wheel and spinner settings
  • Troubleshooting guide for perfect binding
  • Troubleshooting guide for hot melt adhesive, eg adhesion, stringing, charring etc
  • How to measure the amount of hot melt on a spine
  • Animal Glue troubleshooting

We can help. Adhesive experts.
Contact our glue specialists today.

Related Pages

Operator safety

Technomelt Supra


Resource Centre