Set-up procedures for knives and anvils can vary according to the make and model of the packaging machine, knife adjustment style, and other factors. There are, however, some general principles that make these adjustments more effective and efficient, reducing downtime and parts costs.
♦ Optimize Knife Design
- Knives ground on a diagonal, or bias–whether they have a zig zag or a straight cutting edge–require less pressure to cut so they are easier to set up and typically last longer.
- Zig zag knives with smaller (more) teeth are also easier to set up and provide longer life.
♦ Set Up the Crimpers First
- Clearance and Pressure Adjustments required to create a good seal can impact the knife and anvil set-up.
♦ Make Sure the Crimpers, Including the Slots, are Clean Before Installing Knives and Anvils
- Material or product build-up can make parallel adjustment of the knives and anvils difficult or impossible, and may cause intermittent cutting issues during production.
♦ Always Change the Anvil When Changing a Knife
- A knife may not cut cleanly across previously made impressions in a used anvil, and the excess pressure required to cut can cause premature knife failure.