PETpla.net Insider 01+02 / 2016

INSPECTION 20 PET planet insider Vol. 17 No. 01+02/16 www.petpla.net Country National Measurement Institute United Kingdom National Physics Laboratory (NPL) United States National Institute of Standards and Technology (NIST) Japan National Institute of Advanced Industrial Science and Tech- nology (AIST) Germany Physikalisch-Technische Bundesanstalt (PTB) Table 1 - A small selection of National Measurement Institutes from around the world Measurement competency is assessed and monitored by accredi- tation bodies. They ensure labora- tories are capable of calibrating in accordance to the national standard. Torus Measurement Systems have an in-house measurement labora- tory accredited by the United King- dom Accreditation Service (UKAS), for internal and external calibration services. Specifying measurement performance The questions set-out at the beginning of this article can now be answered in reference to Torus’ B300 Wall Thickness Gauge. How do we know the measured value reflects the physical size and has not been affected by linearity errors? The gauge has a proven accuracy deter- mined by performing a ‘Type A’ corre- lation study on a master artefact, see Table 2. In addition, 4 reference pucks of thickness 0.125mm, 0.250mm, 1.000mm and 1.500mm, are supplied with each gauge, verifying the system will remain linear through its meas- urement range. How do we know the reference standard used for setup is correct? The artefact and refer- ence pucks are UKAS calibrated and traceable to a national standard for thickness measurement. How do we know, if re-checked, the results would repeat within an acceptable range? The gauge repeatability is confirmed by conducting a comprehensive R&R study, as previously detailed, see Table 2. Feature Accuracy +/- (mm) R&R (mm) Wall thickness 0.020 0.020 Base thickness 0.050 0.050 Overall height 0.025 0.050 Base clearance 0.025 0.050 Table 2 - Proven accuracy and repeat- ability values for the B300 Wall Thick- ness Gauge Beyond base and wall thickness measurement Torus Measurement Systems have produced a wall thickness gauge by combining new technology, sophisti- cated software and stringent metrol- ogy techniques. Enhanced bottle profiling and positioning has enabled shoulder, wall, base peak and base valley thicknesses to be inspected, as well as measuring Overall Height and Base Clearance. The new B304 Top Load & Volume Gauge has been developed by continuing to apply the above principles and innovation to fur- ther meet industry requirements, see Figure 6. Improvements include; inte- grated top loading and volume testing into a single station, removing the need to move the bottle between tests and reducing labour time and costs; a unique fill nozzle design that improves reliability and fill level repeatability; calibrated load cell and weigh scale traceable to national standards. The measurement principles, as outlined in this article, are currently being implemented on a new high-speed automatic preform measurement and inspection gauge. Figure 6 - B304 Top Load & Volume Gauge www.torus-group.com Cape Town Port Elizabeth Maseru (Lesotho) Durban Maputo (Mozambique) Pretoria Gaborone (Botswana) Johannesburg Hong Kong Chongqing Xi'an Taiyuan Shenyang Qingdao Nanjing Guangzhou Shanghai Beijing Jinan BE PART OF IT! www.petpla.net The South Africa Road Show The China Road Show April – October 2016 August – September 2016 The worldwide round trip with to to Powered by