Rolls & Doctor Blades

Dandy Roll — Formation and Watermark Roll for Fourdrinier Machines

Name: Dandy Roll
Brand: Allwin Machinery

A dandy roll rolls on top of the wet sheet on a fourdrinier wire to improve formation, even out the two-sided difference and, with a patterned wire, lay a watermark. It is the cheapest single upgrade for sheet uniformity on a culture or specialty paper machine.

Cultural paper: writing, dictionary, copy base, wood freeSpecial paper: cigarette, decorating base, capacitor, filter paperPaperboard: triple and quintuple wire whiteboardHigh strength fluting paper

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Built to drawing or sample · Export packed · Ships from Qingdao

Overview

The dandy roll is an effective equipment for improving paper uniformity and reducing the difference between two sides of the sheet, enhancing physical characteristics. Mounted on the top of the wire where the stock is still fluid, it couples wire and sheet in one motion and can also carry watermarks. It is a small investment with an outsized effect on formation.

Construction and features

Standard machine speed 700 m/min
Width for paper web up to 5,660 mm
Wire structures: unperforated spiral, double diagonal perforated, honeycomb-like
Easy installation and operation

Where it is used

Cultural paper: writing, dictionary, copy base, wood freeSpecial paper: cigarette, decorating base, capacitor, filter paperPaperboard: triple and quintuple wire whiteboardHigh strength fluting paper

Specifications

Standard machine speed	700 m/min
Width for paper web	5,660 mm
Wire type A	unperforated spiral
Wire type B	double diagonal perforated wires
Wire type C	honeycomb-like
Structure	main body, keel plate, erect plates, threads wound

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Technical questions

Dandy Roll — common questions

Which dandy roll wire structure should I choose?

Unperforated spiral suits smooth closed sheets; double diagonal perforated wires improve drainage on faster machines; the honeycomb-like structure gives the strongest marking action and the best two-sided improvement on heavier grades.

Can a dandy roll be retrofitted to an existing fourdrinier?

Yes. It mounts above the wire between two existing rolls, needs no drive of its own and is turned by the moving sheet. Installation is mainly a question of frame space and wire run geometry.

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