JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 105

curve reaches an upper boundary value. Alongside the ultrasound velocity, the ultrasound amplitude shows a characteristic run. The amplitude is calculated as a percentage and describes the ratio of the detected amplitude to the reference amplitude. characteristic sound velocities as a function of storage time is shown in Figure 3. Fig. 3: Characteristic sound velocities as a function of storage time. Fig. 2: Ultrasound signals for an SMC sample. During the curing reaction, the length of the molecular chains takes a value that matches the frequency of the emitted signal. This range, where resonance vibrations and consequently the maximum absorption occur, can be detected in the diagram as the minimum value. Beyond this point, the absorbability decreases and the amplitude increases as a result of the molecular chain growth until the curing reaction terminates [6]. During the tests, the minimum sound velocities appear at the lowest material viscosity and take nearly constant values of approx. 1,200 m/s. In contrast, the sound velocity for a sound acceleration of 1 m/s2 decreases from 2,040 m/s to 1,820 m/s after 18 weeks of storage. Correspondingly, the difference between the two values decreases over time. This decrease can be explained by the reactivity reduction of the peroxide component in the SMC [3]. Monitoring the compression moulding process Controlling the material reactivity These two parameters are used to monitor different material and process parameters. In a first test series, the properties of semifinished Class A SMC (SMC 0400 5321, Menzolit Compounds International, Heidelberg) are investigated. This kind of material is used for exterior applications in the automotive industry. Curing tests are performed to determine the development of the material reactivity. The tests are executed using a small testing device with a round cavity (diameter 40 mm) and a constant thickness of 4 mm. The device is equipped with ultrasound sensors. To determine the influence of the storage time (storage temperature +12°C), the tests are repeated after periods of several weeks. A characteristic reactivity value is required to compare the tests. The velocity difference between the minimum ultrasound velocity value and a value at a high degree of cross-linking is suitable in this case. Yet the maximum velocity cannot be definitely detected because the sound velocity grows very slowly over long periods of time. Therefore, the sound velocity c is differentiated and a point where only minor changes in velocity occur (dc/dt=1 mm/s2) is chosen as the upper limit value. The tests are executed for mould temperatures of 130°C, 140°C and 150°C. The test results are discussed for 140°C and are transferable to the other temperatures. The development of the Besides the properties of the semi-finished product, the compression moulding process parameters are of interest because of their decisive influence on the quality of the final part. Therefore, these parameters need to be traced and controlled to guarantee a constant quality. One of the most important parameters is the process temperature, which is the parameter that initiates and terminates the curing reaction. Figure 4 shows the ultrasound velocity of the Class A-SMC processed at 130°C, 140°C and 150°C. The diagram shows that the start of the curing reaction is offset due to different mould temperatures. The reaction starts earlier at higher temperatures. While a difference of around 60 seconds is recorded between mould temperatures of 130°C and 140°C, a 25-second delay can be detected between 140°C and 150°C. The reason for the different time lags is the faster inhibitor consumption at higher temperatures. Additionally, the complete reaction of the SMC requires more time at lower temperatures. The opportunity to monitor the curing reaction makes it possible to use ultrasound velocity as a control signal to terminate the moulding process. Hence, the process cycle time could be reduced to a minimum value by taking into account the actual temperature conditions inside the mould for each process. In addition to monitoring the process temperature, the start of the curing reaction gives information on the progress of the No47 March-April 2009 / jec composites magazine 105

JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009

Cover
Editorial
INDEX
NEWS WORLDWIDE
CONTENTS
Companies - Airbus to manufacture composite parts in China
 - Isomatex enters its industrial phase
 - Shanghai FRP Institute : an original model
Agenda of events
Companies - Key customer strategy opens up new markets
Equipment - New kind of portable NDT device
BUSINESS
Market survey - Industrialization of the carbon composite industry
Trends - Composite challenges to meet growing wind-industry needs
  - Advantages of natural-fibre applications using biohybridcomposites
 - Recyclable and repairable thermosets
Niche market : Drone - A UAV made in Switzerland
Human Capital - Training specialist
Decision-making aids - Controlling product costs as early as the concept design phase
FEATURE - AUTOMATION
Process - Laser-assisted thermoplastic tape-laying systems
Fibre placement - Fibre placement robots and software
Robotics - Robotics for composite materials
Cutting & laser tool - Cutting, kitting and assembly of composite materials
Waterjet system - Machining airframe compositeswith abrasive waterjet
Pultrusion - Radius-PultrusionTM widens the borders of profilemanufacturing
Germany : country of honor
SPECIAL JEC SHOW PARIS
JEC End-users Forums
JEC Innovation Awards
Innovations
USERS’ PLATFORM
Composites in the world - Composite shutter
 - Space divider for indoor and outdoor spaces
 - Balance between weight and payload
 - The Carbon Fibre Chair
Successful partners - Insulation in high-field superconducting magnets
Application - Rapid manufacturing inmilitary applications
Process monitoring - Process monitoring using ultra-sound measurement technology
KNOW-HOW
Materials - Effect of tackifying binders on matrix properties
Manufacturing - A new generation of rapid manufacturing equipment
Resin - Blocbuilder RC-50 : a novel reactivity controller
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Cover
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 2
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Editorial
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 4
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - INDEX
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - CONTENTS
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 7
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Companies - Airbus to manufacture composite parts in China
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 9
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 -  - Isomatex enters its industrial phase
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 11
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 12
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 -  - Shanghai FRP Institute : an original model
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 14
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 15
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Agenda of events
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 17
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Companies - Key customer strategy opens up new markets
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 19
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 20
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Equipment - New kind of portable NDT device
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 22
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 23
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Market survey - Industrialization of the carbon composite industry
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 25
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Trends - Composite challenges to meet growing wind-industry needs
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 27
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 28
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 -   - Advantages of natural-fibre applications using biohybridcomposites
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 30
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 31
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 -  - Recyclable and repairable thermosets
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Niche market : Drone - A UAV made in Switzerland
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Human Capital - Training specialist
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 35
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - FEATURE - AUTOMATION
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 37
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 38
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Process - Laser-assisted thermoplastic tape-laying systems
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 40
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 41
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Fibre placement - Fibre placement robots and software
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 43
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 44
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Robotics - Robotics for composite materials
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 46
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 47
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Cutting & laser tool - Cutting, kitting and assembly of composite materials
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 49
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 50
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 51
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 52
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 53
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Waterjet system - Machining airframe compositeswith abrasive waterjet
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 55
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 56
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 57
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 58
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Pultrusion - Radius-PultrusionTM widens the borders of profilemanufacturing
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 60
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 61
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - SPECIAL JEC SHOW PARIS
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 63
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - JEC End-users Forums
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 65
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 66
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 67
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 68
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 69
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 70
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 71
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - JEC Innovation Awards
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 73
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 74
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 75
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 76
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 77
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 78
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 79
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 80
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 81
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Innovations
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 83
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 84
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 85
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 86
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 87
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 88
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 89
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 90
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 91
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 92
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JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 94
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 95
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 96
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 97
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 -  - Space divider for indoor and outdoor spaces
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 -  - The Carbon Fibre Chair
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Successful partners - Insulation in high-field superconducting magnets
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 101
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Application - Rapid manufacturing inmilitary applications
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - sc1gr
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - sc1gv
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Pub1
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Pub2
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 103
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - KNOW-HOW
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 105
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 106
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Materials - Effect of tackifying binders on matrix properties
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 108
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 109
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Manufacturing - A new generation of rapid manufacturing equipment
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 111
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 112
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - Resin - Blocbuilder RC-50 : a novel reactivity controller
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 114
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 115
JEC COMPOSITES MAGAZINE - Issue #47 - March/April 2009 - 116
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