Pp Cement Bags Making Machine

New generation block bottom valve sack conversion line adopts hot air welding technology to produce laminated pp woven sacks.Block bottom valve sack is the most well known sack style in the world. It shares many advantages compared to other style sacks such as high strength, low cost, improving filing speed, suitable for automatic insert filing line, great environment protection, stably palletize, high efficient transportation, easy remark, etc. This line is widely used in cement, fertilizer, grain, feed, chemical material industry for packing powder and granule.

 
2. Each line consists of:
 
1 set         UNWINDING STATION
 
         consisting of:
 
         automatic control for guiding the fabric length with transversely movable unwinding stand, tension controller (correction distance < 100 mm)
 
         roll monitoring system: alarm is given before the fabric roll is empty
 
         2 winding shafts with pneumatic expansion chucks for a core diameter of 108mm (76 mm)
 
        
 
1 set         PERFORATION SYSTEM
 
         for providing a pin perforation in the tubular fabric to achieve better air permeability of the AD*STAR.  sack. Perforation is effected over the complete surface of the sack.
 
        
 
1 set         CROSS-CUTTING UNIT
 
         for cutting the fabric to the preset length and consisting of:
 
         intermittent traction system with servomotor
 
         print mark reading device for printed tubular fabric
 
         pneumatically operated knife including brake valves in the end positions
 
        
 
1 set         INTERMITTENT FEED SECTION WITH PIN TRANSPORT
 
         is the zone where the fabric length is cut. Consequently, the fabric is constantly decelerated and accelerated. The variations in speed are compensated by the compensator. The intermittent feed section consists of:
 
         intermittent pin transport unit
 
         Servo-drive with self-referencing function, thus ensuring a precise sack transfer
 
         manually adjustable (depending on the sack dimension) bottom opening station
 
         transfer station to the continuous transport section
 
        
 
1 set         CONTINUOUS FEED SECTION
 
         is the zone where the sack is transported at a constant speed and without pins to the different folding devices and welding stations. The continuous feed section consists of:
 

 
         bottom closing by means of adjusting spindles
 
         belt system for the transport of the sacks via an acceleration belt from the
 
main machine to the stacking unit
 
        
 
1 set         MANUALLY ADJUSTABLE BOTTOM CENTER DISTANCE
 
         for sack length adjustment
 
        
 
1 set         VALVE UNIT
 
         The valve patch, which has been cut from flat fabric, is applied onto the sack and welded by means of hot air. The valve unit consists of:
 
         unwinding station with band brake, monitoring system for fabric end and
 
automatic control for guiding the fabric length
 
         pneumatic expansion chuck
 
         traction unit with separate servo-drive for the infinitely variable adjustment of the patch length
 
         cutting unit for the valve patches, adjustment of the knifes with a special designed gauge is from outside possible.
 
         hot air welding device
 
        
 
1 set         BOTTOM PATCH DEVICES
 
         The bottom patches, which have been cut from flat fabric, are applied onto the closed sack bottoms and welded by means of hot air. The bottom patch devices consist of:
 
         unwinding station with band brake, monitoring system for fabric end and automatic control for guiding the fabric length
 
         pneumatic expansion chuck
 
         traction unit with separate servo-drive for the infinitely variable adjustment of the patch length during the operation
 
         print mark reading device for printed bottom patches
 
         cutting unit for the bottom patches, adjustment of the knifes with a specially designed gauge is from outside possible.
 
         hot air welding device
 
        
 
 1 set       STACKING UNIT
 
         constructed as a conveyor belt with package separation for an individually adjustable sack number per package
 
        
 
1 set         MAIN DRIVE
 
         consisting of:
 
         position-controlled servomotors with transport system without pins
 
         Duplex  chain drive
 
         control elements
 
         drive connections to the other drive units by means of a software coupling
 
        
 
1 set         ELECTRICAL INSTALLATION
 
         central power distribution for drive, heating and control systems
 
         control cabinet, completely installed and checked when connected to the line
 
         optimized energy distribution and protection of the line components
 
         modular machine structure for add-on and retrofit purposes
 
         highly advanced safety and monitoring equipment with checking system
 
         separate bus system for the drive system and the control level, including a clearly structured diagnosis system and an integrated software temperature control
 
         control cabinet cooling by circulating air, for unlimited ambient temperatures