TECHNOLOGY | MEDICAL
MEDICAL | TECHNOLOGY
formed by a group of experts, known as the Task Force, consisting of product and process engineers at the plastics processor. Every product has critical quality attributes (CQA), which in injection moulding production can be, for example, a linear measure or the surface quality. In the validation, it is necessary to find the correspond- ing critical process parameters (CPP) that affect the CQA. The experts define these critical injection moulding parameters on the basis of data sheets and figures based on experience with comparable injection moulding processes. In the case of critical components such as functional elements of a drug delivery system, the statistical design of experiments (DoE) is used to determine the process limits. For the majority of applications, simplified planning based on empirical values is sufficient to define a permitted parameter window. If the CQA are within the accepted limits, parameter ranges in which the process can be adapted can be set. In addition, the stability of the process is examined in this phase. The iQ weight control assistance system is a
real-time control software that adjusts process parameters during production to ensure consistent
high part quality. The software compares the injection pressure above the screw position with a reference pressure curve and identifies deviations in injection volume and viscosity. The automatic adjustment of the switchover point, injection profile and holding pressure compensates for target deviations shot by shot. Consequently, the switcho- ver point and holding pressure level must be defined as CPP in the validation strategy. The limit values for the switchover point and holding pressure determined in the DoE are adopted in the CC300 controller of the Engel injection moulding machine as the limit value for process control by iQ weight control. If it is neces- sary to regulate the parameters outside of the validated limits in order to achieve the specified product quality, a corresponding procedure can be defined in the control system. For example, the respective shot can be declared as scrap or the production process can be stopped if the limit values are exceeded. Simplified rules are also possible. For instance, by keeping the switchover point constant and adjusting the holding pressure, or vice versa, keeping the holding pressure constant and adjusting the switchover point.
WEDNESDAY 16 SEPTEMBER, 11:00AM ONLINE AUCTION
EXCELLENT QUALITY PLASTIC INJECTION MOULDING AND VACUUM FORMING MACHINES, 3 & 5 AXIS CNC MACHINING CENTRES AND ANCILLARY EQUIPMENT
By Order of a Retained Client, The Assets Formerly Used by Megaform Limited
• Negri Bossi V210-2100H-820 210 Ton (2003)
• Negri Bossi M360 VS1300-H-670 130 Ton (2010)
• Negri Bossi V110-1100H-375 110 Ton (2000)
• Negri Bossi V85-300MO 85 Ton (2000)
• Arburg 320M Allrounder Twin Screw 85 Ton (1993)
• (2) Boy 50M 50 Ton Plastic Injection Moulding Machine
• Boy 30M 30 Ton Plastic Injection Moulding Machine
• (4) Boy 22M 22 Ton Plastic Injection Moulding Machine
• (10) ICS I-Temp C190E Temperature Controllers
• (5) Shini STM-910WF-CE Temperature Controllers
• Various Shini & Jenco Mobile Hopper Dryers
• Various Yudo Hot Runner Controllers • Tria & Blackfriars Granulators • Mitutoyo PJ-3000 Profile Projector
• Geiss Type 2000x1000 Five Axis CNC Milling Machine (1997)
• Pacer 1250 HD Type 2500 Columbo 3 Axis CNC Router (2002)
• (2) Illig UA100ED Vacuum Forming Machines
• Illig UA200EDF Vacuum Forming Machine • Kent PP150 Pad Printer • Mecasonic Omega II Sonic Welder • Elu DG79 Chop Saw • Inglet Verdi 330cm Vertical Panel Saw • Wadkin Spindle Moulders • (2) Hydraulic Presses • (2) Ovens
• Stock of Plastic Injection Moulding Granules
• Hyster 3.5 Fortens 6m Lift 3.5 Ton Gas Powered Lift Truck (2008)
• Mattei AC30L (2013)
• Atlas Copco GA30C FF (2002) Air Compressors
• Boltless Racking • Office Furniture
Contact: Robert Playle, e:
rplayle@hilcoglobal.eu • m: +44 (0) 7970092966
www.injectionworld.com
rplayle@hilcoglobal.eu
Subject to Availability • 15% Buyer’s Premium • View: 8 September, By appointment Visit:
www.hilcoind.com/sale/megaform • Location: Basingstoke, UK
www.hilcoind.com/sale/megaform September 2020 | INJECTION WORLD 41
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