Pre-opened Bag Converting Machine
The PRE-600 converts a reel of poly film into pre-opened bags on a roll with one side sealed and two perforation lines: one at the bottom for inline pre-opening and one on the side for easy opening after packing. The machine runs at 30 to 150 pieces per minute and produces bags up to 550 mm wide and 1000 mm long. This allows packaging producers to supply pre-opened bags directly to autobaggers without manual intervention, reducing labour and improving throughput.
- Produces pre-opened bags on a roll that feed directly into autobag lines, reducing manual handling
- Two perforation lines enable automatic pre-opening at the bottom and easy side opening after packing
- Adjustable speed from 30 to 150 pcs/min allows matching output to downstream machine capacity
- Automatic photoelectric tracking and microcomputer length setting ensure consistent bag size and alignment
- Automatic counting and high-limit stopping prevent overproduction and reduce material waste
Why Buyers Choose It
- Manual bagging is slow and inconsistent compared to pre-opened bags fed to an autobagger
- Standard bags require manual opening before packing, increasing labour and error rate
- Inconsistent bag size or alignment causes jams in automated feeding systems
- Lack of pre-opening features delays the packing process in high-speed lines
- Suppliers of pre-opened bags on a roll may have long lead times or high costs
Who Runs This Machine
- Poly bag makers adding pre-opened bag capacity to their product line
- Packaging converters supplying rolls to autobaggers and packing machines
- E-commerce fulfilment centres automating bagging of fragile or high-volume items
- Furniture and appliance packers using pre-opened bags for consistent sealing and opening
Where This Machine Is Used
- Protective packaging producers supplying pre-opened bags on a roll to e-commerce fulfilment centres
- Poly bag makers upgrading from standard bags to pre-opened rolls for automated packing lines
- 3PL operators running high-speed autobag systems that require consistent roll-fed input
- Packers replacing manual bagging with a roll-fed system for consistent, repeatable results
- Manufacturers of pet products and consumer goods using pre-opened bags in automated packaging lines
Features And Specifications
Technical features
- Single-sided pre-opened bag design with zigzag point connection and one open side
- Two perforation lines: one at the bottom for inline pre-opening and one on the side for easy opening
- Photoelectric automatic tracking system ensures accurate alignment during production
- Microcomputer length setting allows precise control of bag length and roll count
- Automatic counting and high-limit stopping stop the machine at the set number of bags
- Adjustable speed from 30 to 150 pcs/min to match downstream equipment
- Magnetic powder brake and clutch maintain consistent web tension
- Pneumatic cylinder controls the sealing and perforating units for reliable operation
Specifications
| Machine model | PRE-600 |
|---|---|
| Max width of bag-making | 550 mm |
| Max length of bag-making | 1000 mm |
| Max diameter of unwinding | 600 mm (can be special design) |
| Max diameter of rewinding | 400 mm (can be special design) |
| Max speed of bag-making | 30-150 pcs/min |
| Paper core of unwinding | 3 inch (76 mm) |
| Paper core of rewinding | 3 inch (76 mm) |
| Thickness of film (single layer) | 0.008-0.15 mm |
| Electric Power | 12 kW |
| Overall Dimensions | 5800 x 1200 x 1600 mm (L x W x H) |
| Weight | 2000 kg |
How The Machine Runs
Materials
- Poly film reels with thickness from 0.008 to 0.15 mm
- Single-layer polyethylene or similar film suitable for heat sealing
- Optional laminated film for moisture or barrier protection
Quality Control
- Photoelectric tracking ensures consistent bag alignment across the roll
- Automatic counting verifies the number of bags produced before roll completion
- Magnetic powder brake maintains stable tension to prevent web distortion
- Sealing and perforating units are tested with customer film before shipment
- Machine runs a full production cycle with test film to verify performance
Customisation
- Unwinding and rewinding diameters can be custom designed for larger reels
- Paper core size can be changed from 3 inch to other standard sizes on request
- Perforation line positions can be adjusted for different bag opening requirements
- Power supply can be built to match the voltage and frequency of the destination country
- Additional sealing or cutting units can be added for special bag configurations
Certifications
- ISO9001:2000 certificate obtained in 2005
- CE certificate obtained in 2006
How It Compares
| Buying pre-opened bags on a roll from a supplier | Converting in house removes the supplier margin but requires investment in film inventory and machine operation |
|---|---|
| Manual bagging with standard bags | Pre-opened bags on a roll eliminate the need for manual opening and reduce labour, but require a dedicated machine and film input |
| Standard bag making machine | This machine adds pre-opening features and perforation lines for automation, but requires more complex setup and film handling |
Running It On Your Floor
- Load a poly film reel up to 600 mm diameter and 3 inch core onto the unwinding shaft
- Set the target bag count and length on the microcomputer control panel before starting
- Start at the lowest speed and gradually increase while monitoring web tracking
- Check the first few bags for correct sealing, perforation alignment, and bag size
- Keep the sealing and perforating units clean to maintain consistent performance
Pre-opened Bag Converting Machine FAQ
What film thickness can the machine handle
It is designed for single-layer poly film from 0.008 to 0.15 mm thick.
How fast does the machine run
Working speed is adjustable from 30 to 150 pieces per minute, depending on film type and setup.
What power supply do you build it for
Standard is 12 kW, and we can build to the voltage and frequency of your country on request.
What is the footprint and weight for installation
The machine is 5800 x 1200 x 1600 mm and weighs 2000 kg, so plan a level floor and access for a forklift.
Can it produce bags with different perforation patterns
Yes, the perforation lines can be adjusted for different opening requirements on request.
Do you hold quality certificates
Wenzhou Snda Machinery holds an ISO9001:2000 certificate obtained in 2005 and a CE certificate obtained in 2006.
Machines Often Bought With It
2 Lines Pre-opened Bag On-a-roll Making Machine
The PRE-600 converts a single wide roll of poly film into two parallel rolls of pre-opened bags in a continuous process.
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Fanfold Pre-opened Poly Bag Making Machine with Zig-zag Folding
The PRE-600 converts a reel of single-layer poly film into fanfold pre-opened bags on a roll with zig-zag point connecti.
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Model 450 Packing Machine
The Model 450 Packing Machine automatically feeds pre-opened PE bags from a roll, sets the bag, and seals it in one cont.
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Model 550 Packing Machine with computer and printer
The Model 550 Packing Machine converts pre-opened PE bags on a roll into sealed, labelled bags at speeds up to 1800 bags.
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Guides On This Material
Quote The Pre-opened Bag Converting Machine
Send your paper or film specification and target output. We will confirm the model, the lead position and the price.