Smooth-wall Silicon-core Subduct Production Line
A high-speed co-extrusion line for smooth-wall silicon-core sub-duct from 12/8 mm to 42/36 mm, with a permanently low-friction silicone inner layer for air-blown fibre and cable installation.
Production line introduction
How the Smooth-wall Silicon-core Subduct Production Line is engineered, and which sub-assemblies protect the duct properties your customers actually buy.
The smooth-wall silicon-core sub-duct line combines a high-speed HDPE extruder with a co-extrusion die head that bonds a silicone inner layer to the inside wall of the duct. The duct is sized in a combined multi-sheet water-bath calibrator and a vacuum calibrating tank, cooled through a series of immersion tanks, then dried, hauled off and coiled.
The line covers the complete telecom sub-duct range — 12/8, 14/10, 20/16, 25/20, 28/24, 27.2/23.2, 29/25, 33/28, 38/32 and 42/36 mm. Line control is by Siemens PLC with synchronised temperature, speed and vacuum control, and remote diagnosis of the machine status.
Machine set composition
Every line is quoted as a complete set. The main assemblies below are included in the supply.
| No. | Machine set composition | Qty. |
|---|---|---|
| 1 | SJ-60/36 high speed Extruder for HDPE | 1 set |
| 2 | XAL-300 Automatic Loader | 1set |
| 3 | XBD-75 Hot Air Dryer | 1set |
| 4 | High Speed Smooth Duct die head moulds | 1 set |
| 5 | Specialized High Speed Calibrator | 10uniys |
| 6 | SGZL-63 Vacuum Calibrating Cooling Stand | 1 set |
| 7 | SGL-63 Water Cooling Tank | 3 sets |
| 8 | Dehydration drying unit | 1 set |
| 9 | PQ-500 High-speed Belt Haul-off Machine | 1 set |
| 10 | SGJ-1300 Pipe Winder Machine | 1 set |
| 11 | Siemens PLC programmable computer control system | 1 set |
| 12 | Remote Control System | 1set |
Production line technical advantages
Each sub-assembly is selected to protect the properties your customers buy: blowing friction, diameter tolerance, roundness and coil quality.
High-speed HDPE extruder
Five-stage high-efficiency screw with forced feeding and an AC drive sized for thin-wall duct, holding melt pressure steady at production speed.
Silicone-core co-extrusion die head
Alloy die head machined on imported CNC centres, with chrome-plated mandrel and mouth die so the silicone layer keeps cable blowing friction permanently low.
Multi-sheet water-bath calibrator
The combined multi-sheet calibrator sizes the full sub-duct range on one line, with vacuum control that holds diameter and ovality at production speed.
Vacuum and immersion cooling
A vacuum calibrating tank followed by a series of stainless steel immersion tanks cool the duct progressively, protecting roundness and surface quality.
Servo belt haul-off and winding
Belt haul-off with encoder length metering, coupled to a servo-traversing winder that produces even, tight coils ready for packing.
Siemens PLC line control
Temperature, speed, vacuum and length are controlled from one Siemens PLC system with an operator HMI in English, plus remote control for fault analysis.
Process flow
From raw material to packed coil, every station is matched in capacity so the line runs at the rated speed without a bottleneck.
- Raw material feeding and drying
- HDPE extrusion
- Silicone inner layer co-extrusion
- Co-extrusion die head
- Vacuum calibration
- Multi-sheet water-bath calibration and cooling
- Dehydration drying
- Belt haul-off and length metering
- Coiling
- Coil packing
Wide applicability
Typical end uses for the duct and bundle this line produces, based on the applications BENK equipment already serves worldwide.
FTTH and access networks
Smooth-wall silicon-core sub-duct for air-blown fibre in FTTH, access and metro networks.
Telecom duct networks
Sub-duct for micro-duct and duct networks where low blowing friction and long installation lengths matter.
Cable and power ducting
Protection duct for optical and power cable, including indoor/outdoor riser and backbone routes.
Options and auxiliary equipment
Configure the line for the market you sell into. Popular additions include:
- Gravimetric dosing and colour masterbatch unit
- Additional die heads and calibrators for other sub-duct sizes
- Online diameter and wall thickness gauge
- Double-station winder and automatic coil handling
- Coil packing and film wrapping machine
- Remote control and production data logging
Why buy from BENK Machinery
Extrusion specialists, not traders
BENK designs and builds extrusion lines in Zhangjiagang with an in-house R&D and process team, so machine selection is matched to your resin and product instead of a catalogue number.
Evidence before shipment
Every line is assembled and run in our works. You receive trial video, diameter and output records, and are welcome to attend the factory acceptance test.
Total cost, not lowest price
Energy-efficient drives, permanent magnet motors and optimized heating reduce kWh per tonne, which usually matters more over five years than the initial purchase price.
Real commissioning support
Our engineers install, commission, train your operators and stay involved until the line hits the specified output and quality on your material.
Spares and response
Critical spares are stocked for fast dispatch, and the Siemens Ethernet control platform allows remote diagnostics and software updates.
Upgrades as you grow
Additional die heads, calibrators, co-extruders and winders can be added later, so the line grows with the duct sizes and bundle types you sell.
Frequently asked questions
The questions buyers ask most often about this line.
What size range does the line cover?
How is the production speed set?
How is the silicone inner layer applied?
How is the finished duct coiled?
What is included in the delivery?
Get a quotation for the Smooth-wall Silicon-core Subduct Production Line
Tell us the duct sizes or bundle types, the raw material, the target line speed and the country the line will be installed in. We will reply with a sized configuration, a budgetary price and an indicative delivery time.
- Telephone
- +86 512 5896 1463
- Mobile / WhatsApp / WeChat
- +86 159 5096 2426
- kpm@benkpm.com
- Address
- No.20 Huatang Road, Economic Development Zone (South District), Zhangjiagang City, Jiangsu, China
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Zhangjiagang City BENK Machinery Co., Ltd. · www.benkpm.com · Plastic extrusion lines and extruders since 2004.