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. It handles film thickness from 0.008 to 0.15 mm and produces bags up to 550 mm wide and 1000 mm long. The machine forms the film into tubes, seals both sides, perforates for easy separation, and rewinds into two finished rolls. This allows packaging producers to supply pre-opened bags directly to autobaggers without manual intervention.
- Produces two rolls of pre-opened bags from one wide film reel, reducing handling and setup time
- Eliminates manual bagging by delivering bags ready for automated feeding into an autobagger
- Handles film thickness from 0.008 to 0.15 mm, suitable for standard poly film used in e-commerce
- Max speed of 30 to 150 pieces per minute allows output to match downstream packaging lines
- Single machine can produce multiple small-width bags without needing separate equipment
Why Buyers Choose It
- Manual bagging is slow and inconsistent compared to pre-opened bags fed from a roll
- Buying pre-opened bags from suppliers adds cost and long replenishment cycles
- Producing small-width bags requires multiple machines or separate slitting steps
- Single-lane machines cannot meet high-volume demand for small bags efficiently
- Film waste increases when cutting narrow widths from wide rolls without inline processing
Who Runs This Machine
- Poly bag makers producing pre-opened bags for e-commerce and retail
- 3PLs and fulfilment operators integrating roll-fed bagging into their lines
- Paper converters and film processors adding pre-opened bag capability
- Packers using pre-opened bags for electronics, apparel, or consumer goods
Where This Machine Is Used
- E-commerce fulfilment centres running autobag lines that require pre-opened bags on a roll
- Poly bag makers supplying pre-opened bags to 3PLs and retail packers
- Packaging converters adding pre-opened bag capacity without investing in multiple single-lane machines
- Firms replacing manual bagging with automated roll-fed systems to reduce labour costs
- Producers of small-width bags (e.g. 5–12 cm) who need high output from a single machine
Features And Specifications
Technical features
- Two parallel bag-making lines run simultaneously from one wide film reel
- A-frame folding forms the film into a tube before sealing and perforation
- Dual heat sealing lines ensure strong side seals on both bags
- Dual perforating lines allow clean separation of individual bags
- Slitting blades divide the wide film into two narrow tubes before bag formation
- Pneumatic pressure controls sealing and cutting force for consistent results
- Automatic tension control maintains film stability during folding and sealing
- Rewinding on two 3-inch paper cores allows simultaneous production of two rolls
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 rolls from 0.008 to 0.15 mm thick
- Single layer polyethylene or similar film used in bag production
- Optional laminated film with barrier properties for moisture or dust protection
Quality Control
- Automatic tension control prevents film wrinkling and misalignment during folding
- Heat sealing temperature and pressure are calibrated to maintain consistent seal strength
- Perforation depth is adjustable to ensure clean separation without tearing
- Machine is test run with customer film before shipment to verify performance
- Dual sealing and perforating lines are checked for alignment and consistency
Customisation
- Unwinding and rewinding diameters can be designed for larger or smaller reels
- Film thickness range can be adjusted for different material types
- Number of lines can be changed to 1, 3, or 4 based on production needs
- Sealing and perforation patterns can be modified for different bag styles
- Power supply can be built to match the voltage and frequency of the destination country
Certifications
- ISO9001:2000 certificate obtained in 2005
- CE certificate obtained in 2006
How It Compares
| Buying pre-opened bags from a supplier | Converting in house removes the supplier margin and reduces delivery delays, but requires inventory of film and machine investment |
|---|---|
| Single-lane pre-opened bag machines | This dual-line machine doubles output for the same footprint, especially useful for small-width bags |
| Manual bagging with cut film | Automated roll-to-roll processing is faster and more consistent than cutting and folding film by hand |
Running It On Your Floor
- Load the poly film reel onto the 3-inch air shaft with the unwinding direction facing the machine
- Set the target bag length and perforation spacing on the control panel before starting
- Start at the lowest speed and gradually increase to ensure the film tracks straight
- Check the first few bags for seal strength, perforation quality, and alignment
- Keep the sealing and slitting blades clean to avoid film residue and inconsistent cuts
2 Lines Pre-opened Bag On-a-roll Making 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 many bags can it produce per minute
The maximum speed is 30 to 150 pieces per minute, depending on film thickness and bag size.
Can it make small-width bags like 5–12 cm
Yes, the machine can produce small-width bags by dividing the wide film into two narrower tubes before bag formation.
What power supply do you provide
Standard is 12 kw, and we can build to the voltage and frequency of your country on request.
What is the machine footprint and weight
The machine is 5800 x 1200 x 1600 mm and weighs 2000 kg, so plan for a level floor and forklift access.
Can the number of lines be changed
Yes, the machine can be customised for 1, 3, or 4 lines based on production needs.
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
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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Multi-Lane Pre-opened Bag Making Machine
The PRE-600 converts a single wide roll of poly film into 1 to 4 finished pre-opened bags on a roll in one process.
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Guides On This Material
Quote The 2 Lines Pre-opened Bag On-a-roll Making Machine
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