Product Overview
CPP Film Slitting Equipment converts wide CPP parent rolls into narrower finished rolls through controlled unwinding, web guiding, longitudinal slitting and rewinding. It is used for CPP film processing in flexible packaging, lamination, printing and related converting operations.
Configuration is matched to film thickness, parent-roll width, unwind diameter, target slit width, finished-roll diameter, core size and required production speed.
CPP Film Processing
CPP film thickness affects cutting conditions, web tension and winding pressure. The operating range should be established from the actual film specification and roll dimensions.
CPP film requires controlled web tension during unwinding and rewinding. Tension settings are adjusted according to film thickness, web width and roll diameter.
Winding conditions determine finished-roll structure. Tension, winding pressure and roll diameter are coordinated to maintain consistent roll build across the production run.
Slitting Configuration
Razor Slitting
Razor slitting is suitable for many thin CPP film applications. Blade position and cutting depth are set according to film thickness and required slit width.
Shear Slitting
Shear slitting uses opposing knife edges and can be selected when the film structure and required edge condition call for controlled shear cutting.
Edge Trim
Continuous edge-trim removal keeps the slitting area clear during production. Trim handling is selected according to trim width and operating speed.
Key Equipment Features
Tension Control
The tension system regulates web tension through the unwind, slitting and rewind sections. Control settings can be adjusted as the roll diameter changes.
Web Guiding
The web guide corrects lateral film movement before the slitting section. This helps maintain the specified slit position across the finished rolls.
Differential Rewinding
Differential winding allows individual slit rolls to accommodate variations in winding conditions. It is suitable when several finished widths are produced from one parent roll.
Operator Control
Operating parameters can be adjusted from the control interface according to the selected configuration, including line speed, tension and winding settings.
Typical Applications
Flexible Packaging Film
CPP film can be slit into narrower rolls for pouch, bag and other flexible packaging processes.
Laminating Materials
Slit CPP rolls can be prepared for downstream lamination where defined web width and controlled roll formation are required.
Printing and Converting
Finished rolls can be produced to specified widths for printing and other film converting operations.
Technical Parameters
|
Parameter |
Typical Range |
|
Film Material |
CPP |
|
Film Thickness |
20–120 μm |
|
Working Width |
1,300–1,600 mm |
|
Maximum Unwind Diameter |
800 mm |
|
Maximum Rewind Diameter |
600 mm |
|
Maximum Slitting Speed |
500 m/min |
|
Minimum Slitting Width |
25–30 mm |
|
Core Diameter |
3" / 6" |
|
Web Guiding Accuracy |
±0.5 mm |
Configuration Selection
Film Thickness
Film thickness determines the suitable tension range and slitting arrangement. Thinner films require closer control of web handling and winding parameters.
Finished Roll Width
The required slit-width range determines knife positioning, shaft configuration and the number of finished rolls produced from each parent roll.
Roll Diameter
Parent-roll diameter determines unwind capacity. Finished-roll diameter determines rewind capacity and affects the winding cycle. Both dimensions should be specified during technical review.
Production Quality Control
Slit Edge
Knife type, blade condition, cutting position and web tension affect the finished edge. The slitting arrangement is selected according to film thickness and required edge condition.
Roll Alignment
Web guiding and knife positioning maintain the required lateral position during slitting. Consistent alignment supports uniform finished-roll width and edge position.
Winding Condition
Winding tension and contact pressure are matched to film thickness and roll diameter. The settings are controlled throughout roll build-up to maintain a consistent winding structure.
Technical Information Required
For equipment configuration, provide CPP film thickness, parent-roll width, parent-roll diameter, core size, target slit widths, finished-roll diameter and required production speed.
Film structure, winding direction, number of finished rolls and downstream processing requirements should also be confirmed when relevant to the production process.
FAQ
Q: What CPP film thickness can the equipment process?
A: The standard configuration covers CPP films within the stated thickness range. The final working range depends on film structure, roll dimensions and required winding conditions.
Q: Which slitting method is suitable for CPP film?
A: Razor or shear slitting can be selected according to film thickness, edge requirements, slit width and production conditions.
Q: What determines the required machine width?
A: Maximum parent-roll width is the primary factor. Usable web width and the required edge-trim allowance should also be included in the specification.
Q: How is tension selected for CPP film?
A: Tension is set according to film thickness, web width, roll diameter and winding requirements. The final settings are established during machine setup and production trials.
Q: Can different slit widths be produced?
A: Yes. Knife positions can be changed for different finished-roll widths within the specified operating range.
Q: What information is needed for equipment configuration?
A: Film thickness, parent-roll width and diameter, target slit widths, finished-roll diameter, core size and required production speed provide the main technical basis for configuration.
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