M.Sc. Daniel Hart | Institute for Non-Metallic Materials, Clausthal University of Technology | Germany
PhD Natalja Romero Sarcos | Institute for Non-Metallic Materials, Clausthal University of Technology | Germany
Dr.-Ing. Hansjörg Bornhöft | Institute for Non-Metallic Materials, Clausthal University of Technology | Germany
Prof. Joachim Deubener | Institute for Non-Metallic Materials, Clausthal University of Technology | Germany
Dr.-Ing. Andreas Ehrenberg | FEhS - Institut für Baustoff-Forschung e. V. | Germany
Granulated blast furnace slag (GBS) is a by-product of the pig iron production in the blast furnace process and a very important secondary cementitious material. GBS is chemically a calcium aluminosilicate glass, which is obtained by tapping of the molten slag at operating temperatures of about 1500 °C followed by rapid quenching through a water jet. The chemical and physical properties of GBS depend strongly from the used raw materials and are influenced by production factors as well. In the current research the hyperquenching-annealing-calorimetric scanning (HAC) approach is utilized to determine the fictive temperature of GBS and to approximate the corresponding cooling rate. Furthermore, the reactivity of pristine and annealed GBS as an additive in cement is investigated to analyse the impact of thermal history on technical properties.
Analysis and comparison of hot forming technologies for complex 3D thin glass applications
M.Sc. Paul-Alexander Vogel | Fraunhofer Institute for Production Technology IPT | Germany
Dr.-Ing. Olaf Dambon | Fraunhofer Institute for Production Technology IPT | Germany
Prof. Thomas Bergs | Fraunhofer Institute for Production Technology IPT | Germany
The continuously rising demands in the today’s thin glass application market towards increasing precision, high surface finish, geometrical complexity yet low cost for glass components and products (such as 3D smartphone or automotive interior thin glass covers) require advanced fabrication technologies. The conventional method via grinding and polishing is limited to those applications mainly due to the unavoidable deformation caused by mechanical stress between glass and clamping parts (leading to breakage of glass) and is not suited for mass production.
Over the last decades, replication technology such as thermal gravity slumping has become an advanced method in manufacturing complex and precision thin glass products. However, the technology efficiency is strongly diminished by incomplete glass flow into mold cavity and relatively long processing time.
In contrast, such deficits can be avoided by two novel molding processes with vacuum assistance, recently developed at Fraunhofer IPT. The vacuum-assisted slumping and thermal deepdrawing processes both promise an effective and reliable technology in the fabrication of high precision thin glass products for mass production.
In this presentation, the different technologies for thin glass forming (gravity and vacuum assisted slumping, deep drawing and press molding) will be explained and compared in order to illustrate the processes´ efficiency and provide guidance for industrial applications.
Lubrication in glass production: Migrating your glass production from manual to fully automatic lubrication - potential routes and their pros and cons
Dipl.-Ing. Matthias Görisch | Linde AG, Linde Gases Division, Linde Gas Deutschland
Coming from manual lubrication, container glass manufacturers often need to decide how to put lubrication in glass forming to the next level in order to ensure safety, achieve higher process efficiency and productivity gains. The migration to a fully automated lubrication system offers promising opportunities.
Linde, as a leading solution provider and partner for the glass industry, presents an in-depth comparison of existing and currently evolving lubrication technologies in the industrial glass forming process. This includes manual swabbing, spraying solutions, robot technologies and Linde’s automatic, flame-based pure carbon coating solution (CARBOFLAM). After discussing the various options, Linde outlines the benefits, opportunities and limitations of each solution from the customer’s perspective.
Additionally, Linde gives insights into its proven CARBOFLAM technology and highlights thermal stability as a strong pro, among others. Moreover, Linde presents CFD results from lab installations as well as results from full-scale industrial installations with a newly developed and enhanced CARBOFLAM nozzle that is now able to serve long and complex moulds.
Several leading container glass companies have already explored their potential routes for lubrication in glass production and decided for the CARBOFLAM technology. Learn more about it from Matthias Goerisch (Market Development Metallurgy/Glass, Linde Gas Germany).
Heye International: IS Machine Blank Side Automation
Dipl.-Kfm. Peter Witthus | Heye International GmbH | Germany
Wilfried Seidensticker | Heye International GmbH | Germany
Heye International systems to optimize the production of glass containers:
• GOB WEIGHT CONTROL
• GOB LOADING MONITOR
• BLANK SIDE TEMPERATURE CONTROL.
CAMERA-BASED GOB WEIGHT CONTROL AS NEW OPTION FOR BLOW-BLOW PRODUCTIONS
The camera system for gob weight control offers the possibility to determine and control the gob weight in blow-blow productions. Two cameras placed underneath the shears act as sensor, while the software logic calculates the weight and automatically adapts the feeder settings. At the same time, the cameras show the gob shape.
GOB LOADING MONITOR
The gob loading monitor assists the operator in optimising the loading of the gob into the blank mould. Important defects like loading marks are avoided and the glass distribution becomes stable. The system provides data about gob slope angle, gob length and speed. The gob loading monitor combines two high-speed cameras to record images of the gob when falling into the blank mould. The software calculates different values and presents them together with the images on a screen. An additional hand-held unit allows the operator to make corrections directly in front of the IS section. A data history allows users to draw-back conclusions from defects and to set-up better operation procedures.
BLANK SIDE TEMPERATURE CONTROL – OPTIMAL TEMPERATURE MANAGEMENT ON THE BLANK SIDE
The blank side temperature control is a closed loop solution to improve the wall thickness, while achieving better process stability and short job changes. An infrared camera measures the temperature of the mould halves, the neckring and the plunger. The system modifies the cooling intervals for the blank mould halves, the neckring and the plunger. The result is a stable parison temperature, leading to better glass distribution and process stability.