Here are several issues and conditions that have an impact on edge trim performance:
- Slitter Condition: To determine cut quality, both male and female knives should be either new or resharpened. Sharp knives maintain a consistent cut necessary for slitting a narrow continuous stream of light weight material.
- Slitter Set-up: It is important to determine proper cant angle. The slitter manufacturer is generally the most qualified to suggest cant angles. Look to them also for the amount of over speed and penetration required.
- Trim Take Away: Adjustment rings to support the trim and help prevent tearing may be added. The diameter of the rings should be approximately the same as the female knife.
- Take Away Suction: It is good idea to have the ability to adjust the volume of suction of the removal system. Adjustment the suction allows for proper pull on the trim stream against the knives. This process shears the material and prevents tearing.
- Edge Alignment: Web steering or edge guidance is suggested particularly if a narrow trim is required. If these units are not available, the roll stand’s guidance components must be in good repair to allow incremental side lay adjustments.
- Line Speed: The width of edge trim may determine maximum achievable line speed. Web fluctuation relative to speed may cause wandering. This produces a varying width of edge trim. A slower operating speed may overcome this condition.
