This document describes the ZD-FJ08C Roll-fed Square Bottom Paper Bag Machine, manufactured by Jiangsu Fangbang Machinery Co., Ltd. This machine is designed for the production of paper bags from raw or pre-printed reel paper, integrating side gluing, tube forming, bottom forming, and bag collection into a single, continuous process. It is an ideal solution for manufacturing foodstuff bags and shopping bags.
Function Description
The ZD-FJ08C operates under a central computer control system with a touch screen display, and the length of the bag tube is precisely controlled by a servo motor, allowing for the production of paper bags of various sizes.
The machine's operation is divided into several key components:
Unwinding Component:
This section is responsible for holding the paper material reel and ensuring controlled feeding. It features a separate single-station unwinding reel-stand with a motor lifting device for easy loading. An air shaft, equipped with an air gun, secures the paper reel. Tension control is managed by a magnetic powder brake and an automatic constant tension controller. Material alignment is maintained by an EPC web guide control system. The unwinding component is primarily composed of the unwinding frame, air shaft, loading device, guiding system, tension control system, and electric control system.
Side Sealing Frame Component:
This component applies glue to the paper before tube forming. It uses a traditional glue transfer method where a glue transfer pulley dips into a side glue plate. Excess glue is removed by a side glue scrapper, and the remaining glue is transferred to a gluing pulley, which then applies it to the raw paper. The gluing pulley's separation and reunion with the raw paper are pneumatically controlled by a clutch cylinder. The gluing position on the raw paper can be adjusted via a hand wheel. This component ensures that the paper is properly stuck and formed into a tube as it passes through the forming mould.
Tube Forming Component:
This part forms the paper material into a tube. It features a fixed forming mould structure, with side sealing occurring above the mould. Adjustable multi-discs are used for side tucking, which efficiently reduces resistance during tube formation. The machine comes equipped with one customized forming mould (default size is 127 mm). The tube forming component consists of the tube forming machine frame, forming mould component, side tucking disc component, and paper pressing pulley component.
Main Machine Component:
This is the core of the machine, where the main bag formation processes occur. Material feeding is precisely managed by a servo motor, and an automatic photocell correction system is used for pre-printed materials. The entire main machine component is controlled by an inverter-fed motor. Key features include:
- Cutting Part: Utilizes a rotary serrated cutter with elliptical gears. The cutting speed is adjusted based on the paper tube length, controlled by two eccentric gears.
- Transfer Pulley Part: Transfers the paper tube to subsequent stages. Its pressure and horizontal position are adjustable.
- Line Pressing Part: Creates the necessary pressing lines for the bag bottom. Its pressure and horizontal position are adjustable, with the distance between pressing lines set according to the bag bottom size.
- Bottom Opening Part: Opens the bottom of the paper tube. The horizontal position of the bottom opening rattler is adjustable based on the paper tube width.
- Bottom Former Part: Shapes the bottom of the bag. It includes side guiding boards and a middle guiding bar, which are selected and adjusted according to the bag width.
- Square Bottom Forming Part: Forms the square bottom of the bag using central clamps, side clamps, first clamps, and second clamps. The positions and opening widths of these clamps are adjustable to ensure proper bag bottom formation.
- Bottom Gluing Part: Applies glue to the bag bottom. Rubber boards are stuck onto the gluing pulley, and the relative position and quantity of glue applied are adjustable.
- Bottom Inserting Part: Inserts the bottom of the bag using slotting tools. The insertion depth and width of these tools are adjustable based on paper bag dimensions and paper quality.
- Bottom Folding Part: Folds the bottom of the bag using a bottom folding rod and board. The position of the folding rod and board are adjustable to ensure accurate folding.
- Automatic Disengaging Function: Prevents bottom gluing during empty feeding to avoid drum contamination.
- Clutch Function: In the bottom gluing part, this is managed by pneumatic control.
- Adjustable Paper Tube Guiding Forming Mould: Allows for flexibility in bag dimensions.
- Adjustable Bottom Creasing Device: Used to adjust the bag bottom size.
- Bottom Opening Cylinder with Split Cam: For stretch length adjustment of bottom opening.
- Multi-layers Bottom Forming Drum, Center Grippers, Second Tuck Clamps, and Drum Grippers: All are adjustable for ease of changeover.
Bag Collection Component:
This final section delivers the finished paper bags to a vertical workbench for easy collection. The bag collection driving wheels are driven by the main inverter-fed motor. A pneumatic striker on the workbench is used for counting the bags. It also features an automatic counting function.
Control Component:
The entire machine is centrally controlled by a PLC with a self-diagnosis function, monitoring the machine's status. A touch screen is used for input control and displaying machine status. The bag tube length is controlled by a servo motor, and bag collection speed is controlled by an inverter-fed motor. The main machine component is also primarily controlled by an inverter-fed motor.
Important Technical Specifications
- Machine Model: ZD-FJ08C
- Max. Production Speed: 260 bags/min
- Total Power: 13.5 kW (ignoring accessory equipment)
- Main Motor: 7.5 kW
- Traction Servo Motor: 4.29 kW
- Hydraulic station Oil Pump Motor: 1.5 kW
- Weight of Machine: Approx. 6000 kg
- Overall Dimension: L8500mm × W1700mm × H1600mm
- Power Supply: 3 phases, 380V±10%, 50 Hz (three-phase five-line system)
- Compressed Air:
- Pressure: 0.6 MPa
- Volume: approx. 0.5 m³/h
- Oil and humidity: >8 mg/m³
- Installation Height: 1500 m
- Ambient Requirement:
- Relative moisture: Max. 65% when 40 °C
- Temperature range: 10~40 °C
- Paper Bag Size Range:
- Max. Paper Reel Diameter: Φ1200 mm
- Paper Reel Core Diameter: Φ76 mm (3")
- Paper Reel Width: 290~630 mm
- Paper Thickness: 45~140 g/m²
- Bag Tube Length: 190~370 mm
- Bag Body Width: 80~200 mm
- Bag Bottom Size: 50~105 mm
- Machine Accuracy:
- Flatness: 0.02/1000mm
- Parallelism between Rollers: 0.03/1000mm
Usage Features
- User-Friendly Control: The machine is controlled by a central computer system with a touch screen for input and status display, simplifying operation.
- Automated Processes: Features like automatic photocell correction for pre-printed materials, automatic constant tension control for unwinding, and automatic disengaging function for bottom gluing enhance efficiency and reduce manual intervention.
- Adjustability for Various Bag Sizes: Numerous components, including side tucking discs, bottom creasing device, bottom opening cylinder, bottom forming drum, grippers, clamps, and slotting tools, are adjustable to accommodate different paper bag dimensions and paper qualities.
- Quick Material Loading: The unwinding component's motor lifting device and air shaft facilitate easy and quick loading/unloading of material reels.
- Safety Features: Includes protection circuits for grounding, emergency stop buttons, and clear warnings regarding electrical components and high-temperature parts.
- Operational Modes: Side gluing and bottom gluing parts offer manual and automatic operation modes, allowing for flexibility during adjustment and normal production.
- Inching Function: Dedicated buttons for "Main Motor Inching" and "Whole Machine Inching" allow for precise, slow movement of the machine, crucial for setup and troubleshooting.
- Pressure Adjustment: Air source pressure for various pneumatic cylinders (e.g., material traction pressing rollers, bottom gluing part) can be adjusted via dedicated knobs and monitored with pressure gauges.
Maintenance Features
- Daily Cleaning: The machine requires daily cleaning to remove powder and dust, preventing short circuits, poor contact, and false operations that could impact machine performance and product quality.
- Glue Component Cleaning: All components that come into contact with glue (glue plate, dipping pulley, transfer pulley) must be thoroughly washed after use, especially when stopping the machine for extended periods, to prevent glue solidification and ensure future production quality.
- Lubrication: Daily oiling of all oil points and sliding parts is essential. This includes the iron plectrum sliding part, slotting tool seat part, side clamp part, central clamp part, bottom opening rattler part, first and second clamps part, lifting part of transfer pulley seat, lifting part of line pressing pulley seat, and all cam parts.
- Regular Inspections: Daily checks for abnormal noise or situations in transmission, tension of synchronic belts and chains, and air leakage in pneumatic devices are required. Pressure gauges should be confirmed to be in good condition.
- Monthly Checks: Air source processing components should be inspected monthly.
- Annual Overhaul: A comprehensive overhaul is recommended annually to replace worn parts affecting running accuracy and to re-inspect and adjust the mounting accuracy of the entire machine.
- Professional Maintenance: All maintenance and repair work should be performed by professional personnel, strictly adhering to the Operation Manual and safety regulations. Only company-provided or approved substitutive components should be used for replacements.
- Pre-Inspection Safety: Before any inspection or repair, the machine must be powered off.
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