machinery feature | Film winders


Reifenhäuser has added the Midex-HSD winder to its portfolio


and skills of the operator. The new design of the Midex-HSD winder can handle such large diameters without problem. “The reel is no longer moved by a rotating arm or


turret mechanism, but slides horizontally onto the machine frame as the diameter is growing,” said Borutta. “The working principle of the horizontal slide winder enables considerably higher reel loads to be taken up.” The result is reels of larger diameters. These Reifen- häuser winders are designed as a standard to produce up to three webs, though additional webs are possible on demand. Depending on the winding shaft used, the maximum reel diameter of 1200 mm can even be obtained with multi-web winding. As well as the established rotary arm winders of the


SML says that it recently sold its 100th


W2000 horizon- tal sliding winder


Midex-RA model type – which are specially designed for the production of finished reels of smaller diameters up to 1000mm – the horizontal slide winders of the new Midex-HSD model are suited for customers who need large diameters to produce jumbo reels. “We are already about to plan the next step,” said


Borutta. “Should the trend continue, especially for metallisers, we will make reel diameters of 1500mm possible.” CSC’s range of products is complemented by


Midex-HSS horizontal slide winders that are specially optimised for thicker and sturdier films, such as barrier films.


Still going strong SML says that its W2000 concept for the horizontal sliding winder, with integrated, servo-positioning drive technology, has now been going strong for 20 years. The company says that it recently sold its 100th W2000 – proving it is still in demand. The company says that the concept involves two


28 FILM & SHEET EXTRUSION | April 2017 www.filmandsheet.com


winding stations moving independently of one other on solid sidewalls along horizontal sliding rails that are free from backlash. As a result, the winder offers unmatched vibration-free operation, says SML. Both winding stations consist of a chuck head with a winding drive on one sidewall and a clamping fork on the opposite site, and are equipped with precise servo-positioning drives. These have integrated, absolute encoders, which feed back the position with one-tenth of a millimetre accuracy. No mechanical connection is required between the chuck and the clamping fork on the different sidewalls, as this has been replaced by electronic synchronisation. The active winding station moves back continuously from the contact roller in line with the increasing diameter of the building roll, thereby avoiding any stop-and-go movement and creating straight-edged rolls.


This saves a great deal of space and during a roll change the active winding station approaches the new winding station to a distance of only a few millimetres, which prevents roll tail and telescoping. This is a huge advantage over a turret winder and is the reason why the W2000 is suitable for part-roll winding, says SML. The interaction of the precise positioning drives in the winding stations and the contact roller frame help to ensure that the winder can integrate six different cutting devices: a stationary knife, for cast film in the 6-180 micron range; guillotine cutting with a counter knife, for PP, PS and PET thermoforming sheets; a combination of these two cutting units, for back sheet films for the photovoltaic industry and high quality polycarbonate films; winders with a twisting knife, for hygiene film lines; a pneumatically operated chopping knife with a belt cage and guiding air, as an alternative


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62