Inline weight-per-meter control
Inline gravimetric weighing is converted to weight per meter in real time; the system compares it with the setpoint and adjusts screw speed and haul-off speed to hold the weight steady.
Inline extrusion control · closed-loop
Weight-per-meter control systemkeeping every meter of cable at a stable weight and wall thickness
Guangzhou Fit Circle Technology focuses on inline measurement and closed-loop control for cable extrusion. The system samples weight per meter, reference wall thickness, haul-off speed and extrusion output in real time, then corrects deviations automatically through screw speed and haul-off speed synchronization, keeping process variation inside a narrower band.
Live weight per meter
0.1413kg/m
Reference wall thickness
1.650mm
Haul-off speed
60.013m/min
Extrusion output
508.70kg/h
Example readings from the system HMI on a production line; actual values vary with product specification and process settings
Core capabilities
The key extrusion parameters, watched automatically by the system
From gravimetric weighing to screw & haul-off synchronization, the system builds a closed loop around two core metrics — weight per meter and wall thickness — reducing the lag and repetition of manual adjustment.
Closed-loop wall thickness compensation
Compensation is applied from the reference wall thickness and the measured deviation. The compensation value can be entered manually or left to the system to control automatically.
Screw & haul-off synchronization
Screw speed and haul-off speed are tuned together so extrusion output matches line speed, avoiding diameter variation caused by over-drawing or material build-up.
Process trend monitoring
Weight per meter, output, haul-off speed, screw speed and hopper weight are logged together on one screen, so an abnormal trend is visible at a glance.
Auto control active · Specification confirmation
0.1413kg/m
System interface
One screen for the running state of the whole extrusion line
The HMI is built on a touchscreen. Its main screen brings together weight per meter, reference wall thickness, wire diameter, material density, wall thickness compensation, screw speed, haul-off speed and extrusion output, so operators no longer have to cross-check several instruments.
- Auto control active: once the loop is engaged it corrects deviations continuously, with no need for frequent manual intervention
- Specification confirmation: confirm the process parameters in one step when changing specification, reducing changeover errors
- Material usage statistics: output and weight-per-meter data recorded per take-up reel for traceability and accounting
- Trend logging: several process curves logged on the same screen for later review and analysis
Function modules
Functions designed around how the shop floor actually works
Every function maps to a real action in the extrusion shop, so operators can follow it and use it fluently.
MODULE 01
Live weight-per-meter display and setpoint
Current weight per meter, setpoint and deviation are compared on one screen; a reading outside the allowed band is flagged immediately, so feeding and material changes are easy to follow.
MODULE 02
Wall thickness compensation
Reference wall thickness and compensation value are entered per specification, and the system adjusts its control target accordingly, covering different conductor diameters and insulation layer thicknesses.
MODULE 03
Screw and haul-off synchronization
Screw speed, haul-off speed and extrusion output move together, with smooth transitions at start-up, speed-up and stop, reducing scrap cable.
MODULE 04
Specification confirmation
Confirm the process parameter set when changing specification, so settings carried over from the previous run do not cause batch-wide deviation.
MODULE 05
Material usage statistics
Length, weight per meter and output are recorded per take-up reel, giving the shift team data for accounting and quality traceability.
MODULE 06
Trends and alarms
Curves for weight per meter, output, haul-off speed and screw speed are logged, abnormal states are flagged promptly, and operator access is permission-controlled.
Applications
Running steadily on cable extrusion lines
The system is installed on the extrusion line and works with the extruder, haul-off and pay-off/take-up sections, covering the whole cycle from start-up to reel change.
Cable extrusion
Wire shop production line
Closed-loop weight-per-meter and wall thickness control, holding the insulation layer weight and thickness steady
Metering & extrusion
Gravimetric weighing and gear pump
Inline weighing with metered output, holding material use per unit length steady
On-site service
Installation, commissioning and training
On-site calibration, parameter tuning and operator training — ready to use on delivery
Site readings
The parameters actually running on the system HMI
The figures below are taken from photographs of the system HMI on a production line. The system continuously samples weighing, rotational speed and line speed signals from different sections and converts them into consistent process metrics on a single screen.
| Process parameter | Site reading |
|---|---|
| Weight per meter | 0.1413 kg/m |
| Reference wall thickness | 1.650 mm |
| Wire diameter | 17.50 mm |
| Material density | 1.42 g/cm³ |
| Wall thickness compensation | 0.020 mm |
| Screw speed | 41.24 rpm |
| Haul-off speed | 60.013 m/min |
| Extrusion output | 508.70 kg/h |
Implementation
From survey to production use, delivered in four steps
The plan is set against the actual conditions of the line, then calibrated and tuned step by step, so normal production is not disrupted by a single large change.
On-site survey and requirement confirmation
We review the extruder model, product specification, material and output requirements, and confirm the measuring points and the scope of modification.
Hardware installation and weighing calibration
The weighing and signal acquisition parts are installed, then weight calibration and signal integration are completed to ensure accurate data.
System commissioning and closed-loop go-live
Control parameters are tuned; operation is observed in manual first and then switched to automatic, and the loop goes live once stability is confirmed.
Operator training and ongoing follow-up
Shift teams are trained on daily operation and common fault handling, with technical support provided throughout later use.
About Us
An engineering company focused on inline extrusion measurement and control
Guangzhou Fit Circle Technology Co., Ltd. is based in Huangpu District, Guangzhou, and focuses on inline measurement and control for cable extrusion. Around weight per meter — the core process metric — we provide a complete solution from signal acquisition and metering conversion to closed-loop control and data logging, delivered on a touchscreen HMI and installed directly on the extrusion line.
We believe stability matters more than impressive numbers on a specification sheet. Every function of the system exists to save the operator a trip, to keep process variation a little smaller, and to bring the weight of every reel closer to its design value.
Want to see how this system would work on your line?
Tell us your machine model, product specification and the weight-per-meter or wall thickness problem you are facing, and we will propose the matching control scheme and configuration.
Or call us directly on enquiry form