As corrugated packaging continues to evolve, more demands are being placed on diemakers to produce dies that cut everything from F-Flute to Triple Wall. We understand that proper rule selection plays a vital part in the successful diecutting of any grade of corrugated. That is why National offers nineteen styles of rotary cutting rule; each specifically engineered to provide optimal diecutting performance.
Every style of rule designed by National is evaluated to see how it performs, using the following criteria:
■ Pressure required to cut a given material.
■ Penetration into the blanket.
■ Appearance of the edge after diecutting.
■ Longevity (wear) of the rule.
It is not hard to design a product that will provide maximum performance on one of these variables. The challenge comes in engineering products that excel in a given area while performing well on every one of the other four elements.
There are four characteristics of all rotary rules that determine how well a product will perform:
■ Pitch – Pitch refers to the number of teeth per inch. Generally speaking less teeth per inch will cut with less pressure while more teeth per inch will result in increased pressure.
■ Geometry of Tooth – The geometry or shape of the tooth will affect both the cutability and bendability of the rule.
■ Depth of Gullet – Gullet depth is a key factor in determining the longevity of the rule.
■ Hardness – The temper of the rule will determine the formability of the rule, as well as affect longevity
See individual product pages for different size variations available for each individual product. If you use a product that is not shown as a standard, please contact us about setting up a stocking program to insure prompt service.
Straight rule is available in various style coils or 30”, 36”, 48” and one meter lengths. Custom lengths may be available on special order.
Standard curvatures: 37 1/2” (257 mm), 38” (279 mm), 50” (360 mm) and 66” (487 mm). Custom curvatures may be available on special order.
Standard back notch: N1, 1/2” (12.7 mm) centers, 1/2” (12.7 mm) deep. Custom notch may be available on special order.
National manufactures a wide variety of cutting rules for a wide variety of applications. The chart shown below can be used as a guide to help determine what tooth configuration options are recommended (or are acceptable) for specific grades of corrugated. This chart does not take into consideration liner and medium weights.