ring dies

ring dies are vertically functioning pressing tools in the form of a ring, with boreholes distributed on the circumference or sheath surface in the s.g. Press holes.

The working width also called running ban width is limited by free stitches for the displacement of material surpluses


1- Counter-bore
2- Depth of depth
3- Press channel length
4- Wall thickness
5- Working width
6- Bore /pellet diameter

Press holes can be manufactured in almost any size.

These press holes usually consist of 3 areas:

The feed cone: this is responsible for the pre-compression of the press material as well as the soft material feed into the press bore.

The press channel determines the compression of the press material.
With increasing channel length, the compression of the press material increases

The counter-bore depending on the design (cylindrical or conical), determines the breakage Guide behavior of the pressling already within the die


The pressing tools running in or on the die are referred to as collier rollers.

Coller rollers are available with different surface structures such as:

fluted or perforated surface structures.

Fluted rollers, differ in the way of corrugation such as straight-ribbed,
slanted-ribbed-left-ribbed, slanted-right, Herringbone-ribbed, finely ribbed or coarsely fluted.

Also punched collier differ in simply punched, punched / sunkor or conically punched.

Depending on the type and application, the selection of the tool surface thus influences the pressing behaviour as well as to the pressquality quality.

Complete collier rollers consist essentially of: the coller sleeve of the bearing of the coller axis to the coller lids small parts such as seals, spacer rings, etc.

Using the example of a ring die press the press rollers are arranged within the die. Here, the conveyed centrally and passes through the rotation of the die between roller and die. In the press zone, i.e. the contact area between roller and die, the actual compression takes place and the finished press leaves the die at the circumferential surface

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