Fischer, Worthberg
Testing and Processing # 1985 York
Modern extrusion will in future mean computer control. Even the mere introduction of a microcomputer-based wall thickness measuring apparatus helps to save 1-2 % of material in pipe manufacture. Automatic centering of the die, in conjunction with wall thickness measurement and with gravimetric feed of the extruder, with throughput control or weight per metre control, completes the feedback system for automatic pipe extrusion. This allows material savings of 3 to 4 % or even more. First and successful strides forward have been made in the direction of optimized profile extrusion. Computer control of extrusion lines means cost savings and quality improvements even today, and will be a "must" in future.
Related papers
Author(s) : Paul J. Freudenthaler, Joerg Fischer, Mathias Eder, Reinhold W. Lang
For controlled water disinfection, typically chlorine is used and preliminary studies demonstrate its aging and crack growth acceleration effects on polyolefin pipe materials [1, 2]. Although the use of recycled plastics is not prohibited in some ISO standards for polyolefin piping systems [3–5], only small amounts...
Author(s) : Markus Gall, Reinhold W. Lang, Joerg Fischer, Ansgar Niehoff, Steven Schmidt
Despite recent efforts in promoting the utilization of recycled polymeric materials for more diverse and more advanced applications, there are still significant knowledge gaps with regards to the applicability of certain recyclate types for specific “re-use” purposes. When it comes to pipe applications, for instance,...
Author(s) : Joerg Fischer, Paul J. Freudenthaler, Patrick R. Bradler, Reinhold W. Lang, Susan C. Mantell
This research addresses the effect of nucleation on the global aging behavior and the fatigue crack growth (FCG) resistance of commercial alpha- and beta-nucleated polypropylene random copolymer pipe grades (PP-R) when exposed to chlorinated water (5 mg/l free chlorine) at an elevated temperature of 60°C. Comparing...
Author(s) : Joerg Fischer, Patrick R. Bradler, Reinhold W. Lang
In the present paper, a novel test system for conducting fatigue crack growth (FCG) experiments under superimposed mechanical-environmental conditions is presented. FCG experiments were performed on a polypropylene (PP) grade and a short-glass fiber reinforced polyamide 66 (PA-GF) grade as model materials. The...
Author(s) : Joerg Fischer, Paul J. Freudenthaler, Patrick R. Bradler, Reinhold W. Lang
Cyclic tests with cracked round bar (CRB) specimens have been used for some time to characterize the slow crack growth behavior of polyolefin pipe grade materials. In fact, most recently a standardized test procedure for cyclic CRB testing has been released in ISO 18489. To obtain kinetic data for cyclic crack growth...
Author(s) : Joerg Fischer, Patrick R. Bradler, Reinhold W. Lang, Gernot M. Wallner
The present paper aims to study the crack growth resistance of a black-pigmented polypropylene pipe grade when exposed to elevated temperatures and various environmental media (air, deionized water, ionized water with a specific chloride content, and chlorinated water) under the simultaneous application of cyclic...
Author(s) : Reinhold W. Lang, Patrick R. Bradler, Joerg Fischer, Dominik Poehlmann, Steven Schmidt, Ansgar Niehoff
In the present paper, a highly effective test and characterization concept for polymer recyclate materials is proposed and validated. Based on the proposed methods, a study was carried out to investigate the potential of in-plant and post-use PE recyclates from various applications to be utilized in PE recyclate...
Author(s) : Riccardo Barbone, Georg Fischer
This short paper reviews the major milestones in the history of piping systems. A special emphasis is given to the sources and reasons for innovation. Starting with nature as a basis and discovering the basic laws of hydraulics, man has been driven to innovate by emulating nature. The political and social forces that...
Author(s) : Dr. Stephan Schuessler, Georg Fischer
The development of plant-based raw materials instead of using crude-oil is about to develop to one of the most relevant trends in global chemical industry. In addition to that, concepts integrating the biomass-generation using so-called bioreactors into a closed loop together with a biogas-generator and a combined...
Author(s) : Riccardo Barbone, Georg Fischer Piping Systems, Switzerland
Over 50 years ago, the transportation of chemicals represented one of the first applications for plastic piping systems. Since then, plastic piping system products have continually been developed in accordance with market needs and today are uniquely positioned to provide suitable materials as well as cost-effective...
Author(s) : Schiller, Fischer
Poly(vinyl chloride) (PVC) is one of the most fascinating, interesting, universal and oldest thermoplastics oft all. On one hand it is the polymer which comes into contact with a baby’s skin only a few minutes after its birth, in many contries the bracelet on which the name and the birthday of the newborn are noted is...
Author(s) : Wagner, Siedlarak, Kropp, Fischer
A potable water installation using both DHP-copper and polypropylene as described in various German standards has been in operation now for seven years in an official building in Germany. These materials are used in both the cold and hot water section of the building. Plastic pipes have been installed as an...
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