40 ft of paper travel from preheater to hot plates 3 seconds of heat, glue and bonding 1 chance to get it right! the ZONE
Design & Production
Chicago Electric offers 10 technology solutions to control ‘the Zone’ CORRUGATOR Sectoral preheating plate
Our sectoral preheating plates provide direct heat by means of a double steam circuit, allowing for efficient heating in hard-to-access locations, as well as to act as a steam shower to open the paper’s fibre, making it receptive to absorbing the heat and the glue.
This translates into increased speed and improved quality of the cardboard sheet finish.
The system’s main advantages are as follows:
• The plate may only be used to heat, only to humidify, or both options at the same time. • The plate is sectored, which allows for applying humidity to the sections. • It provides temperature in previously inaccessible locations and near the location needed. • It compensates the loss of temperature dissipated due to distance, speed or limitations of the exiting preheaters. • Quick transferring of heat to the paper. • The combination of the hot plate and steam shower allows for providing heat even to the hardest papers to heat. • Does not dry out the paper. • Possibility of operating as a humidifier and pre-conditioner. • Maintains and improves the fibre’s elasticity. • Acts according to the operator’s needs. • Facilitates the paper’s hygroscopy to absorb the glue and improve rubberising.
1. Wrap Arm - Position & Temperature 2. Preheater Direct Drive
3. Steam Plate 4. Contact Roll 5. Glue Machine Direct Drive Touch Productivity Issue—Glue Unit Many glue units run with a rider roll or a guiding bar system. The rider roll with paper gap allows a precise glue application, but requires frequent Contact Roll
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calibrations and settings. Bar systems avoid this, but compensate this with the risk of exces- sive glue application. The system contains many wearing parts. Solution The contact roll combines the ad antage of both systems and ensures minimum contact between board and applicator roll. The system uses small pneumatic cylinders in order to achieve a “soft touch.”
6. Gap Control 7. Curved Plate 8. Roller Shoe Press When it comes to a short-term increas of web tension, spring loaded systems with shoes or airpressure activated system have problems in compensating these. The system is lifted for a short time. This may result in de-lamination and in the ‘double kiss’ effect. Solution For a defined and exact bonding point of the web fiv weight rollers will be installed usually over the first flat hotplate of the heating section. The rolls are mounted into a frame, which is actuated by means of two pneumatic cylinders. P oductivity Issu —Double Kiss Bonding
9. Thin Wall Hot Plates 10. Pressure System Benefits —Exact glue application due to defined contact of applicator roll to web. Web is in contact to less flute tips compared to bar systems. • High precision glue application • Less moisture applied to web —No wear of shoes and springs —No adjustment of shoes or paper gap —Uniform glue application over entire w orking width for all flutes by use of pneumatic cylinders instead of springs — Less contamination by paper dust and glue remains —No jam of board because of web breaks caused by splice joints going through 630-784-0800 Benefits —Rollers secure exact defined first point of contact of liner and single-faced board - No double kiss —Frame design avoids unintended lifting of roller shoe (compared to spring or air loaded systems) - No double kiss —Pressure can be increased or released for special grades or products 490 Tower Blvd., Carol Stream, IL Contact Chicago Electric to GET IT RIGHT 630-784-0800 firstname.lastname@example.org chicagoelectric.com Solution The ProPress system ensures an optimum heat transfer to the board. It offers a wide range of set- tings. The loadi g pressure can be varied, the number of shoes can be lifted in accordance t the line speed. The outer shoes can be lifted in accordance to the paper width. The shoe bars will be delivered pre-assembled for a short installation time. —Liftable for easy paper infeed and for cleaning of the machine —Position adjustable in paper direction to avoid grooves in hotplate Press Productivity Issue—Poor Heat Transfer Rollers are usually limiting the heat transfer, since they often have contact mainly on the edges of the plates due to wear or bent plates. They also cause often loss of caliper and bearing need to be replaced frequently. Airpressure actuated systems can only supply a limited pressure and have com- pared to shoe systems a closed surface. Pressure Shoe
Plate vity Issue—Poor Heat Control l hotplates are slow to react to pressure due to high steam volume and massive y also have high heat radiation and heat profile. Worn plates can damage crease edge crush.
Thin-Wall Hot Plates
t by peripheral drilled hot plates. anufactured out of special wear and nt steel, through which a continuous is drilled, with one inlet and one outlet. ecured by a massive steel frame.
ance from steam to paper surface results in fast heat flow
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