Slitting & Rewinding The reinvention of rewinding
The biggest visible challenge moving forward is that of innovating at the speed required in order to keep abreast with rapidly evolving business models. Raúl El-Fakdi, Comexi slitting business unit leader explains how the Comexi S1 DS meets this challenge.
he following statement accurately defines Comexi’s mission: “To be leaders in our sector, as a result of developing and offering different equipment, technologies, and services that respond to the needs of converters, while actively taking part in reshaping the flexible packaging industry into one that is environmentally sustainable.” With this mindset invariably at the forefront of the company’s actions, Comexi has designed its last addition to its portfolio: the Comexi S1 DS at 1000m/min. With this addition, Comexi completes its S1 DS machine series, which joins the family of 600 and 800 meters per minute slitters. This addition closes gaps and offers a proper solution in terms of performance and price for various market needs.
T There are two rewinding systems:
O Centre-surface winder (motorisation of the rewinder shaft and the rewinder lay-on roller)
O Centre winder (motorisation of only the rewinding shaft).
The centre-to-surface rewinding system provides superior quality, as the rewinding lay-on point never changes because it is already measures slitting to rewinding distance. With the use of this technique, neither the rewind diameter nor the rewind point influences the quality, thus achieving a higher rewinding quality due to: O The same distance between the slitting and rewinding points always being guaranteed.
O The material stability being maintained. O The absence of result reel flexing owing to the support of the rewinder against the rewinder lay-on roller.
O The tension separation between slitting and rewinding helping to improve the output quality.
However, the pressures on costs and production optimization processes to achieve greater efficiencies have led the market to prioritize productivity over rewinding quality. Companies are being forced to lead with complexity. Due to the rise of stock-keeping units (SKUs) and increased demand of “added value” solutions, such as easy-open packs, enterprises require slitters and rewinders that are not only able to manage more complicated jobs, but also have the ability to avoid having to stop. Centre rewinding machines are more versatile, cost effective, and easier to operate. These were the circumstances that gave rise to the use of duplex machines, two-shafts rewinding machines for slitting and rewinding flexible materials. Afterwards, following the strategy to seek even greater productivity increases, turret machines with four shafts appeared in the industry. With the objective of surpassing the already high productivity levels of current slitters, and in line with Comexi’s values of seeking excellence in quality, we designed and incorporated the ALWS (Advanced Linear Winding System) into the S1 DS. The upward trend in the stand-up pouch market, the increase of paper use to improve the sustainability of packaging, and the rise of packaging based on monomaterial polyethylene, are clear indicators of the future need to increase the diameters of the output reels and, consequently, prioritize overall speed versus the speed of change.
The integration of the ALWS (Advanced Linear Winding System) is significant for its innovative characteristics, and operates similar to a hybrid system between centre-surface and central rewind, thus maintaining the advantages of the former, and while adding features of the central rewinding system, which include: O The rewind point always being the same, regardless of the rewind diameter, thus consistently guaranteeing the same distance between cut and rewind point.
O Having the constant support of the rewinder against the hold-down with horizontal movement and in the same quadrant of the reel, making the pressure and back pressure influential, in turn improving the quality of the centre-surface system.
O Increasing the final rewinding diameter up to 1.000mm and a maximum speed of 1.000mts/ min.
O Versatility and profitability O Being user-friendly and ergonomic O Offering rapid changes with the possibility of incorporating systems such as: An automatic cross-cut system, auto-taping to close coils
An automatic core positioning.
Without a doubt, the 1.000 meters per minute version of the Comexi S1 DS, which has the advanced linear winding system, not only unites the advantages of the various rewinding systems, but also readily allows the flexible packaging industry to make use of them.
Xcomexi.com
24
September 2021
www.convertermag.co.uk
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