What is the difference between thickness and basis weight?
Thickness is the physical distance between the two surfaces of the web. Basis weight is mass per unit area. X-ray gauging fundamentally responds to the material in the beam; calibrated thickness reporting depends on sufficiently stable density and composition. Filled, foamed, coated, or multilayer structures may need sample testing and a material-specific calibration.
What do cross direction and machine direction mean?
Cross direction (CD) means side to side across the width of the web. Machine direction (MD) means along the direction the web travels. Die bolts or air-ring zones usually correct CD profile variation, while average output or line-speed changes affect the MD average through a separate control function.
Does an inline scanner automatically control the die?
Not by itself. A scanner measures and reports the profile. Automatic correction also requires a compatible controller, correct profile-to-actuator mapping, and a die or air ring that can make the adjustment. How much the equipment can actually change the process, its response time, safeguards, and ownership of the machine command must be reviewed.
What is the difference between FLEXSCAN and TREX?
FLEXSCAN runs the Scantech operator workflow, including product recipes, live profiles, trends, alarms, current-profile export, configured control visibility and operational roll or production views. TREX works alongside FLEXSCAN for deeper browsing, tagging, sorting and retrieval of current and archived production reports. TREX availability and included scope follow the application package and written project quotation. Review the
FLEXSCAN and TREX workflow.
When should I choose Addex MGC instead of EGC?
MGC is manual: an operator reviews mapped profile data, often from a marked offline sample, and turns localized air ring control bolts. EGC is automatic: compatible mapped thickness profile feedback commands localized cooling zones. The measurement source is specified separately. MGC can be a practical retrofit when operators have time to make corrections; EGC fits lines needing faster, repeatable closed-loop control. Review
MGC and EGC gauge control.
How is thickness measurement selected for blown film gauge control?
Treat the measurement location and correction system as two related decisions. A Scantech scanner can provide a post-layflat profile when the collapsed web is the preferred measurement point. The profile source still must match the machine layout, rotation or oscillation, response time, reporting needs, and Addex mapping and interface requirements.
What is the difference between DIBC and BIDS?
DIBC coordinates active internal cooling supply and exhaust airflow on a compatible IBC line.
BIDS adds or removes retained bubble air on a compatible non-IBC line. They serve different airflow architectures, and neither replaces EGC gauge profile correction.
Can an air ring upgrade increase blown film output?
It can when cooling and bubble stability are the actual constraints. Intensive Cooling may remove more heat and support greater output, but the achievable gain depends on the extruder, die, resin, bubble geometry, tower, collapsing frame, downstream equipment, and product quality limits. An air ring cannot fix every bottleneck.
Does web-tension control fix thickness variation?
Usually not at the source. Tension can stretch the web and affect wrinkles, tracking, register, coating, slitting, and roll formation, but a die-flow or cooling-profile problem still needs the appropriate extrusion or air-ring correction. Review thickness and tension together when the defect changes through downstream processing.
What is a dead-shaft roller?
On a dead-shaft roller, the center shaft remains fixed while the outer roller shell turns on bearings. On a live-shaft roller, the shaft rotates with the roller. The FMS CA-Series is designed for compatible dead-shaft idlers; live-shaft and pillow-block arrangements use different sensor families. A clear photograph of both roller ends helps confirm the construction.
Is the FMS CA-Series the right sensor for every web line?
No. It is a common starting point when the machine uses a compatible dead-shaft idler. Final selection depends on minimum and maximum tension, web entry and exit angles, wrap, roller weight, shaft dimensions, mounting, speed, environment, and required electronics. There is no reliable basis for assuming every U.S. web machine uses the same roller construction.
Why use segFORCE instead of two conventional load cells?
Two end-mounted load cells provide total tension and may show a left-to-right imbalance, but the combined reading can hide individual tight or loose lanes. segFORCE measures independent positions across the roller, producing a true cross-web tension profile for diagnosing baggy lanes, wrinkles, uneven slit rolls, coating problems, and poor winding.
Can Scantech measure every individual layer in a multilayer film?
Not automatically. The available output depends on how each material interacts with the selected sensor, the layer structure, density and composition stability, total thickness, and calibration. Scantech may report total thickness, mass per unit area, density, filler, or selected barrier-layer information in suitable applications, but representative samples should confirm what can be separated reliably.
How is biax film measured before and after stretch?
A qualified architecture may place one scanner on the incoming cast sheet and another after the MDO, TDO or final-film stage. The two profiles are related through a stretch-aware mapping that accounts for web registration, process delay, trim and tenter-clip regions; it is not a simple one-to-one position match. ULO3, HF3 or SHF3 is selected around each station's width, geometry and measurement scope. Review
biax film thickness measurement and stretch profile control.
What information is needed for a recommendation?
Start with a line drawing, process type, material and layer structure, width, thickness or basis-weight range, speed, temperature, known defects, current measurement method, and the action you want the system to take. For biax lines, add the stretch sequence, station widths, tenter and trim regions, and desired pre-to-post mapping. For BC3, add the die, bolt, heater and interface details. For FLEXSCAN and TREX, define operator views, roll identifiers, retention and reporting needs. For air rings, add bubble and die details. For tension, add roller geometry, web angles, roller weight, shaft construction, and control interfaces.
