Bowed Spreader Rolls

Product Description

Belmark Bowed Spreader rolls are also known as Bowed Roll, Spreader Roll, bowed Roller, Curve bar Expander, Wrinkle removing Rolls,

Bowed Spreader rolls are available in hard chrome surface, rubber surface and also Teflon covering for non-sticking applications. Hard chrome surface bow Rolls are used where speed is more than 300 meters per minute. If the speed is more, bigger diameter is used to reduce the rpm of the roll. Bow roll works only when there is proper lead-in and lead-out distance and the roll is kept in proper warp angle with web material. To do such warp angle adjustment, all rolls are supplied with bow angle adjusting worm-worm wheel gearbox with hand wheel and counter pedestal bearing block. With this it is possible to adjust the bow angle at 360 degree warp angle. When the Roll get maximum wrinkle removing stop the bow angle adjusting and put the roll on bow locked position and do not do any change in the bow setting. On shaft bow position is indicated by an arrow showing the bowed position of the Roll.

For some web materials like PP/LD/LDPE Bow Rubber expander roll, Slat Expander Rolls or scroll rolls will not work for removing wrinkles. This Roll comes in diameter 140mm, if the web width is more than 1000mm. If web tension is not sufficient to drive the roll extra drive like sprocket or pulley given be given as per requirements.

All types of Spreader/ Expanders are available in Bow angle adjustable type so one can adjust the bow angle when the machine is in working condition. Fix the Roll at best bow warp angle it gets maximum spreading, wrinkle removing or slit separating effects. The diameter of the Roll depends on speed of web materials and maximum web width and also the mounting center.

E.g. For 650 mm web width and web speed of less than 50 meters/min, a bow roll of 90mm is sufficient with a shaft diameter of 30mm. For 4500mm web width, 1000mtrs/min speed requires minimum 160mm dia. roll and shaft diameter of 75mm or above. Bowed Roll is available in foot or flange mounting as per specific requirements and applications.