Question 1

What is a slitter rewinder?

Accepted Answer

A slitter rewinder is a machine that takes a wide master roll of material - film, foil, paper or nonwoven - and cuts it lengthways into narrower rolls, rewinding each slit width onto its own core. The result is finished rolls cut to the exact width required for printing, packaging or further converting.

Question 2

What is the difference between a slitting machine and a slitter rewinder?

Accepted Answer

The terms are used interchangeably - a slitter rewinder is a slitting machine that rewinds the slit widths into finished rolls, which is how virtually all modern machines work. All Alpha slitting machines are slitter rewinders.

Question 3

What materials can a slitting machine handle?

Accepted Answer

Alpha slitting machines are built to process plastic films, aluminium and other metal foils, papers and boards, laminates, nonwovens and technical textiles. Because each machine is custom built, the web handling, tension control and slitting method are matched to your specific material - including thin, stretchy or delicate webs that standard machines struggle with.

Question 4

How does the slitting process work?

Accepted Answer

The master roll is loaded onto an unwind stand and the web is drawn through the machine under controlled tension. Blades - razor, shear or crush cut depending on the material - slit the web into the required widths, and each slit width is rewound onto its own core at the rewind station. Tension, speed and blade choice determine the edge quality and roll finish.

Question 5

What is the difference between centre winding and surface winding?

Accepted Answer

In centre winding, the rewind core is driven directly and tension is controlled through the core shaft - suited to lighter, stretch-sensitive materials and smaller finished rolls. In surface winding, the roll is driven by contact with a winding drum, giving consistent density on larger, heavier rolls. Centre-surface machines combine both, using a lay-on drum with a driven core for the widest material range. Alpha builds all three configurations and will recommend the right one for your material and roll sizes.

Question 6

What blade types do slitter rewinders use?

Accepted Answer

Three main slitting methods are used depending on the material. Razor slitting suits thin plastic films; shear slitting - two rotary blades working like scissors - gives the cleanest edge on papers, laminates and foils; and crush cutting handles nonwovens and materials where edge quality is less critical. Alpha slitting machines are specified with the blade system best suited to your material, and some machines combine more than one method.

Slitter Rewinders & Slitting Machines

Two-Drum Paper Winders

Narrow Web Slitter Rewinders

Duplex Slitter Rewinders – heavy duty

Individual Arm Slitter Rewinders

Centre Surface Slitter Rewinders

Duplex Slitter Rewinders

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