National Prenicked

Prenicked rules ensure that the blanks stay together through the diecutting and stripping processes yet separate easily in the blanking section.

We recommend the use of 25.40mm to 38.10mm (1” to 1 ½”) sections of 1.58mm x 1.58mm (1/16” x 1/16”) perforating rule with a height of .76mm (0.30”) less than the cutting rule.    

National Miter Tight

One of the most critical areas of a rotary die is the lead edge knife.

A common cause of lead edge failure is scrap build-up between the rule and the trim breaker knives.

Miter Tight blades are designed to prevent scrap build-up by precisely matching the contour of the bevel rules currently used in lead edges.

They are pre-cut in standard 38mm (1 ½”) lengths to save time in ruling and simplify programming.

Notching and Curving

To ensure that rotary rules perform to maximum efficiency during the diemaking and diecutting processes, the back notching must be accurate, burr free and specific to the application.

When bending a circle for a rotary diecutter, the seating of the rule can be improved by specifying a closer notch such as N2.

Accurate back notching together with the Accu Curve system are two of the best ways of ensuring that the rule seats correctly on the cylinder.

The Accu Curve system thermally transforms the structure of the steel from a straight to a curved state. The process eliminates the memory in the steel thus preventing it pulling away from the cylinder.

Sandvik/National also offer the option of curved rule with no back notch. Available in diameters from 280mm (11”), no notch curved rule works well in places where a solid rule will add strength.

	NI NOTCH 1/2" DEEP (12.7MM)
	NI NOTCH 1/4" DEEP (6.35MM)
	N2 NOTCH
	N2 NOTCH 21/32" DEEP (16.66MM)
	MARAMATSU NOTCH
	CLOSE NOTCH

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