This integrated system automates the complete packaging workflow for PPR/PVC pipes—from infeed and alignment through stretch film strapping, PE bagging, and industrial sewing closure—achieving typical throughput of approximately 60 bundles per minute with pipe diameters ranging from 16mm to 325mm and bundle circumferences up to 450mm.
How Does the Automated Pipe Bundling System Work?
The FHOPEPACK pipe packaging line completes the full packaging cycle through four synchronized workstations: automatic infeed and alignment → high-tension stretch film strapping → protective PE bagging → industrial sewing closure.
Station 1: Automatic Infeed and Alignment
Pipes enter the system via powered roller conveyor. Once photoelectric sensors detect pipe arrival, pneumatic pushers move pipes into the alignment fixture. The fixture uses V-shaped positioning grooves to arrange multiple pipes into a regular hexagonal or rectangular bundle pattern—this is critical for preventing surface scratches caused by pipe rolling friction during transport.
Field detail: PPR pipes have relatively low surface hardness (Shore D approximately 70–75). If the rubber lining pads on the alignment fixture wear out and are not replaced in time, direct metal contact will leave indentation marks on the pipe surface. We recommend inspecting pad wear after every 5,000–8,000 bundles packaged.
Station 2: High-Tension Stretch Film Strapping
After alignment, the strapping arm rotates around the pipe bundle and applies high-tension stretch film (typically LLDPE material, 15–25μm thickness). The tension control system uses a magnetic powder brake for closed-loop control, with typical tension range of 80–150N and accuracy of ±5N.
Film layer count is adjustable (typically less than 10 layers). Too many layers increase film cost and may crush the pipes; too few layers result in loose bundling. For pipes with outer diameter greater than 200mm, we recommend 8–10 layers; for small-diameter pipes (16–50mm), 4–6 layers are sufficient for transport requirements.
Station 3: PE Bagging
The strapped bundle moves to the bagging station via roller conveyor. PE bags can be supplied from pre-made bags or continuous film for on-the-fly bag making, with typical bag thickness of 60–100μm. The bagging action is completed by a cylinder-driven bag-spreading mechanism, and the spreading diameter should be slightly larger than the diagonal dimension of the pipe bundle (recommended clearance: 20–30mm).
Some configurations offer optional inline printing functionality to print product specifications, production batch numbers, or traceability QR codes directly on the PE bag surface—this is a required feature for export pipe compliance traceability.
Station 4: Industrial Sewing Closure
After bagging, the pipe bundle is pushed into the sewing station. An industrial sewing machine (typically Juki or Brother brand, 400–750W power) stitches the PE bag opening with adjustable stitch density of 8–12 stitches per inch.
Field detail: Needle breakage is a common fault. The system is equipped with a broken needle detection sensor that immediately stops the machine and triggers an alarm when a broken needle is detected—this is a critical interlock logic to prevent metal needle fragments from mixing into the packaging bag and avoid customer complaints. After needle breakage, the pipe bundle in the current bag must be emptied and repackaged; do not risk releasing it.
What Are the Advantages of Sewing Closure vs. Heat Sealing?
For PPR/PVC pipe packaging, sewing closure outperforms heat sealing on three key metrics:
| Comparison Dimension | Sewing Closure | Heat Sealing |
|---|---|---|
| Seal Strength | Tensile strength ≥ 120N/50mm | Tensile strength 60–90N/50mm (depends on PE bag thickness) |
| Puncture Resistance | Stitch line can withstand sharp pipe end puncture | Heat seal line is easily pierced by pipe ends |
| Applicable Bag Thickness | 60–200μm all workable | Heat seal quality unstable above 120μm |
| Transport Damage Rate | Approximately 0.3–0.5% | Approximately 1.2–1.8% |
Counter-intuitive insight: Many factories assume heat sealing is more “advanced,” but for products like pipes with sharp cut ends, the physical penetration strength of sewing is far higher than the molecular bonding strength of heat sealing. Especially under long-distance ocean freight or rail vibration conditions, the damage rate of heat-sealed bags is 3–4 times higher than sewn bags.
Technical Specifications and Applicable Pipe Range
| Parameter | Typical Configuration | Notes |
|---|---|---|
| Applicable Pipes | PPR, PVC, PE, PP | Also suitable for steel pipes, aluminum pipes |
| Pipe Diameter Range | φ16–325mm | Larger diameters require customization |
| Pipe Length | 2.6–12m | Standard configuration |
| Bundling Speed | ~60 bundles/minute | Depends on pipe length and layer count setting |
| Film Tension | 80–150N, accuracy ±5N | Magnetic powder brake closed-loop control |
| Sewing Machine Power | 400–750W | Juki/Brother brand |
| Control System | PLC + HMI touchscreen | Supports parameter storage and fault logging |
| Air Supply Requirement | 0.5–0.7 MPa | Oil-water separator required |
| Power Supply | 380V/50Hz three-phase | Or 220V single-phase (low-power configuration) |
| Applicable Standards | ISO 12100 / CE / GB/T | CE certification required for EU export |
Frequently Asked Questions
Can This Equipment Handle Pipes of Different Lengths?
Yes. The PLC program can store multiple parameter recipes, and you can call the corresponding recipe when switching pipe specifications. However, note that when pipe length differences exceed 2 meters, it is recommended to adjust the support position of the infeed roller line to prevent long pipe sagging from causing alignment errors.
How Many Layers of Stretch Film Should I Set?
This depends on pipe bundle diameter and transport conditions. Empirical formula: layer count ≈ bundle circumference (mm) / 50. For example, a pipe bundle with 300mm circumference recommends 6 layers. For ocean export or long-distance rail transport, we recommend adding 2–3 layers as a safety margin.
What Type of Sewing Thread Should I Use?
We recommend industrial polyester thread, specification 40/3 or 60/3 (smaller number means thicker thread). For thick bags (>120μm), use 40/3; for thin bags (60–80μm), use 60/3. The thread must have certain toughness to avoid brittle breakage.
What Is the Equipment Maintenance Schedule?
- Daily: Clean photoelectric sensor surfaces, check air lines for leaks
- Weekly: Check sewing machine oil level, clean cutting blade debris
- Monthly: Inspect alignment fixture rubber pad wear, check stretch film brake friction pads
- Annually: Replace cylinder seals, calibrate tension sensors
Get Technical Documentation
For complete specification sheets, CAD layout drawings, or FAT test reports, contact our engineering team. We can provide:
- Detailed specification documents (including electrical schematics, pneumatic diagrams)
- 3D layout drawings (STEP format)
- FAT test records (including tension test, speed test, continuous operation test)
- CE certification documents (required for EU export)
For more detailed specifications and configuration options for pipe packaging machinery, visit the FHOPEPACK website: https://www.fhopepack.com/Pipe-packing-machine/
