Product Introduction
Kraft Paper Slitting and Rewinding Equipment converts parent rolls into finished rolls with controlled width, tension and winding diameter. It is designed for kraft paper used in packaging, wrapping, paper bags, paper tubes and industrial conversion. Configuration is selected according to basis weight, parent-roll size, finished width, core diameter and required production speed.
Kraft Paper Processing
Processes uncoated kraft paper for packaging and wrapping, with typical basis weights from 40 to 200 g/m².
Handles higher basis weights with controlled tension, suitable knife pressure and reinforced unwind capacity.
Processes kraft grades with varying fiber composition by adjusting tension and slitting conditions to suit web behavior.
Typical Applications
Packaging Rolls
Produces specified-width rolls for paper bags, packaging conversion and continuous wrapping processes.
Paper Tubes
Creates accurately slit rolls for tube production, where stable edges and consistent winding support downstream forming.
Wrapping Paper
Converts parent rolls into selected widths for industrial and commercial wrapping applications.
Reference Technical Parameters
|
Parameter |
Reference Value |
|
Working Width |
1300–2000 mm |
|
Paper Basis Weight |
40–600 g/m² |
|
Maximum Unwind Diameter |
1400 mm |
|
Maximum Rewind Diameter |
1200 mm |
|
Minimum Slit Width |
40 mm |
|
Unwind Core Diameter |
76 mm |
|
Rewind Core Diameter |
76 mm |
|
Maximum Line Speed |
300 m/min |
|
Slitting Method |
Circular Shear Knife |
|
Tension Control |
Automatic |
|
Web Guiding |
Automatic |
|
Power Supply |
380 V / 3 Phase / 50 Hz |
Slitting Configuration
Shear Cutting
Circular top and bottom knives separate the web along controlled cutting lines while supporting a clean kraft paper edge.
Knife Position
Individual knife holders move along the shaft to establish the required slit layout across the working width.
Edge Trim
Trim removal equipment collects outside web waste and keeps the slitting area clear during continuous operation.
Tension and Web Control
Unwind Tension
Pneumatic braking regulates unwind resistance as parent-roll diameter decreases, helping maintain a stable web during processing.
Web Alignment
Edge sensors and guide rollers correct lateral web movement before the material reaches the knife section.
Rewind Tension
Closed-loop torque control adjusts winding force as finished-roll diameter increases to maintain consistent roll formation.
Finished Roll Requirements
Width Accuracy
Adjustable knife positions provide controlled finished widths for downstream packaging, bag and tube production.
Roll Hardness
Controlled tension and winding pressure help maintain stable roll density while reducing the risk of telescoping and loose layers.
Edge Quality
Knife clearance and web stability are adjusted according to paper grade and basis weight to support a clean slit edge.
Production Workflow
Parent rolls are positioned on the unwind stand using hydraulic loading equipment suited to the specified roll weight.
The web passes through guide and tension sections before entering the slitting assembly and rewind section.
Separated webs are wound onto individual cores under controlled torque and pressure until the required diameter or length is reached.
Material and Size Selection
Paper Weight
Basis weight affects tension settings, knife pressure and the required mechanical capacity of the machine.
Parent Roll
Parent-roll width, diameter and weight determine unwind capacity, shaft dimensions and supporting structure.
Finished Roll
Finished width, core diameter and target roll diameter determine knife spacing, rewind shaft selection and winding configuration.
Production Control
Running Speed
Line speed is adjusted according to basis weight, slit width, roll size and required edge condition.
Tension Setting
Unwind and rewind tension can be controlled separately to match changing roll mass and paper characteristics.
Roll Size
Length and diameter counters monitor production values and can stop the machine when preset targets are reached.
Equipment Configuration
Unwind Section
Shafted or shaftless configurations can be selected according to parent-roll weight, diameter and handling requirements.
Slitting Section
Modular shear knife holders allow width layouts to be changed efficiently between production orders.
Rewind Section
Differential air friction shafts accommodate multiple slit rolls while compensating for small thickness differences between finished rolls.
Quality Control Points
Incoming Roll
Parent rolls are checked for moisture condition, core integrity, surface damage and dimensional consistency before processing.
Slitting
Operators monitor slit edges, web tracking, knife condition and machine vibration during production.
Finished Roll
Finished rolls are checked for width, side-face alignment, core position and winding consistency before packaging.
Configuration Information for Inquiry
Material Specifications
Provide paper basis weight, parent-roll width, maximum diameter and total roll weight.
Output Requirements
Specify finished widths, core inner diameter, maximum rewind diameter and required line speed.
Production Volume
Include expected production quantity, preferred slitting method and required automation or material-handling functions.
FAQ
Q: What paper weight range can this equipment process?
A: Reference configurations can process kraft paper from 40 to 600 g/m². Final capability depends on paper structure, roll dimensions and machine configuration.
Q: How is finished roll hardness controlled?
A: Roll hardness is managed through unwind braking, rewind torque and winding pressure. Settings can be adjusted according to paper basis weight and finished-roll size.
Q: What determines the minimum slit width?
A: Minimum slit width depends on knife-holder dimensions, shaft layout, paper properties and the selected slitting configuration. A reference minimum is 40 mm.
Q: What parent-roll information is required for equipment selection?
A: Provide paper basis weight, parent-roll width, outside diameter, roll weight and core diameter. These values determine the main unwind and slitting configuration.
Q: Can the machine process different finished widths?
A: Yes. Adjustable knife holders allow different slit layouts to be configured across the working width, subject to the selected machine range and minimum slit width.
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