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The material is fresh, uncured rubber from an extruder or a calender and can be characterized as hot and sticky with a black and shiny surface that evaporates smoke or fumes.
Measurement data must reflect the true shape and dimensions of the web or the profile and must not be influenced by: Surface texture, color or brightness, Slope, speed or temperature of material, Angle of measurement or Time.

Thickness measurement using non-contact laser sensors can be performed either in fixed tracks along the line or as a scanning system that can provide complete profile information of the material.

A scanning system using two sensors, one above and one below the material, offers a precise and accurate method of monitoring the thickness profile for any type of material in the sheet.

Accurate and precise thickness and profile measurements during Die design will speed up the design process. Accuracy and repeatability are key issues. Being able to measure on slopes without loss of data and ability to reproduce small features correctly are also vital.

The alternative method is to use two fixed sensors measuring against a reference surface, e.g. a reference roller. The method with fixed sensors is a simpler and more straight forward approach, but will not be as accurate and precise as the method with two opposing sensors.

The high-speed profiling sensor measures important parameters such as thickness, width and profile. Keeping track of the position of surface features as ridges, center lines or edges in an extrusion process are examples of applications. Measuring key dimensions of engineered rubber products such as clamps, gaskets and seals are other examples.
SPS2301
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The cause of a non-uniform tire may be an incorrect ply and profile splice. Monitoring the splice on the tire building machine detects errors and trends as soon as possible in the process and avoids scraping a large number of cured tires.

A non-contact laser based measurement normally increases the accuracy in splice offset and overlap detection.

Splice Offset Overlap
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Radial Lateral Run-Out Measuring radial and lateral run out while the tire is being built, will provide the information needed to decide on corrective actions early in the manufacturing process.
When measuring the green tire in the tire building machine, splice overlap and/or underlap in the liner, sidewall, and/or tread components can be analyzed and quantified.

Using "smart" signature analysis of splice measurements, problems can be identified early in the tire manufacturing cycle before curing and testing. This means less scrap and better uniformity. Accuracy and repeatability are key factors for creating a good base of measurements for statistical calculations, e.g. roundness and harmonics.

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Selcom laser sensors have been designed to address the limitations of other bulge and dent measurement sensors by:
  1. Providing accurate and reliable data with very high resolution to allow accurate bulge and dent analysis on tire sidewalls.
  2. Providing high speed measurements.
  3. Ability to measure on slopes without loss of data or the necessity to reposition the angle of attack.
Tire Side Wall
A false positive reject is when a measurement system identifies the tire as defective, yet manual review of the tore indicates a non-defective tire.
Due to measurement system limitations, many manufacturers have no choice but to "over-sensitize" their sidewall bulge and dent measurement systems, resulting in costly manual inspection requirements for all rejected tires.
Some measurement systems can not even distinguish between bulges or dents. With state-of-the art measurement precision and advanced software analysis, false positive rates can be substantially reduced and in many cases even eliminate them altogether.
Multiple-track measurements provide full-tire coverage and allow effective analysis on sidewalls with complex letter and image patterns.
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The objective of tread wear measurement varies depending on the testing organization. Tire manufacturers require accurate wear data of prototype tires in order to refine and improve the design. Automobile manufacturers require comparative measurements to select the best tire design. Tread Wear Analysis
As an extension of traditional tread depth measurements, non-contact laser based measurements provide a complete wear profile of the tire, as well as quantification of irregular wear.
This is important for road noise implications and identifying local wear phenomena such as heel/toe wear, recessed lugs, diagonal wear, shoulder wipe and center wear.
Non-contact laser based tread measurements is also an effective tool for diagnosing manufacturing problems with lateral and radial run-out displacements clearly visible from high precision surface measurements of a new tire.