In conventional extrusion blow molding, complex geometries result in severe fluctuations in wall thickness distribution. With the use of a novel die system, the wall thickness of the BIG Bobby Car trailer can be realized within narrow tolerances.  

Improving Quality and Reducing Weight with Uniform Wall Thicknesses 

Werkzeugköpfe

Blasfolienextrusion

Extrusionswerkzeuge

Extrusion

A Toy Challenges the Engineers  

The production of plastic profiles and film is carried out with highly developed dies in which the geometries are coordinated precisely to the flow properties of the plastics. This coordination often requires long iteration loops in simulation and experiment. These loops represent a considerable cost and time factor, and threaten the prospects of manufacturing in high-wage countries.  

Excellence Clusters Studies Additively Manufactured Extrusion Dies 

Additive Fertigung

Werkzeug- und Formenbau

Technik Trend

kunststoffe-international.com

Fast Product Change in Extrusion  

In 2013, Reifenhäuser introduced the high-performance extrusion lines for PET thermoforming sheets with the patented mechatronic polishing stacks of the MIREX-MT-V design series. Now Reifenhäuser introduces the next generation of this line type. 

Reifenhäuser Combines Improved Components 

Industrie 4.0

Polyethylenterephthalat

Flachfolien- und Plattenextrusion

Folien

Verpackungsmaterial

New Generation of PET Thermoforming Sheet Lines 

Macchi presented at K the new Pod-Flex series for the production of seven-layer blown films with a net width of 2700 mm. The extrusion line can extrude laminate, barrier and biomaterials, since the new TES72 extrusion die, which is completely PVD-coated, can process both polyolefin and barrier-film formulations on the same line. 

Technical Advances in More Flexible Blow-Molding Lines  

Higher Speed for Material Exchange 

Increased output continues to be the most important criterion when investing in new machine technologies. Many of the innovations displayed at the K 2013 are designed to combine increasingly larger throughputs with increased energy and resource efficiency. 

Extrusions-Zubehör

Extrusion Lines: Future-Oriented Process Optimization 

Requirements for a uniform geometrical shape and the most uniform pellet size possible rank very highly. Pellets are produced by mechanical cutting of the melt (hot die-face) or of the extruded strands (cold pelletization). In designing and dimensioning the die heads, very complex physical relationships must be analyzed. 

Die Heads for Strand Pelletization: From the Melt to the Pellet 

Static mixers, if applied in extrusion, can improve product qualities, as well as increase throughputs and diminish start-up times in some cases. This leads to higher performance, less waste and higher productivity.  

Melt Blenders to Step Up Efficiencies in Extrusion Lines  

Mischer

Retrofit Homogeneity  

In extruder construction the rotary joints are normally integrated in cramped installation situations. For that reason slender and compact sizes are called for. On the basis of the proven sealing system of its 7900 series, Haag + Zeissler Maschinenelemente GmbH, Hanau, Germany, has now developed a compact rotary joint, taking into account economic aspects. 

Quick-Change Cartridge System   

Rotary Joints Series 7950 

At the Fakuma 2017 trade show, Leistritz Extrusionstechnik GmbH based in Nuremberg, Germany, presented a novelty in the area of process monitoring. They showed an elongational rheometer that supplies solid data making it possible to prove even the slightest deviation in the production process. 

Elongational Rheometer for Fast and Efficient Process Monitoring 

Messtechnik

Inline-Messtechnik

Qualitätssicherung

Measuring Shearing and Stretching Viscosities Online  

The Davis-Standard Technical Center has announced two additions to its lab capabilities in Pawcatuck, Conn/USA. By the end of the first quarter, Davis-Standard will offer trials for its Davis-Standard Helibar groove feed extruder and the DS Activ-Check control system for continuous extruder monitoring. According to John Christiano, Davis-Standard’s Vice President of Extrusion Technology, both present new opportunities for customers to improve and strengthen processes. 

R&D Additions at Davis-Standard  

Steuerungen (Hardware und Software)

Trials for Extruder Equipment 

On March 19 and 20, 2014, the Institute of Plastics Processing (IKV) is presenting another International Colloquium of Plastics Technology. With the slogan “Nachwuchs, Netzwerk, Innovationen” (New Generation, Network, Innovations), the research crucible is presenting its entire portfolio. Visitors can look forward to a revised event concept with top-class talks and innovative processing techniques. 

Kunststoffverarbeitung: Maschinen und Komponenten

Spritzgießen

Beratung und Consulting

Plastics Technology Colloquium: The Plastics Technology Olympic Games 

Luciano Anceschi, also known as President of Euromap, has found a new managing director for his family's company. 

The Company Develops Its Leadership with this Appointment 

Blasformen

Stefano Venturelli New Tria CEO as of April 1 

The Institute for Plastics Processing in Aachen is drumming up support for an innovative event that will demonstrate diversity and present the unexpected. Even the event's initiator, Prof. Hopmann, is keyed up and can't wait to see what will be presented there ¿ as he divulged to us in an interview.  

IKV premiere will throw light on the fundamentals of plastics technology  

Faserverarbeitung

Lehrstühle und Institute

Call for papers for a symposium for lateral thinkers  

As already known since the previous K, “EVO Ultra Flat” from Reifenhäuser Blown Film GmbH, Worms, Germany, improves the flatness properties of blown film. A new laser-measurement system now enables the improvement to be quantified precisely: laminating and barrier films are up to 40  % flatter while sagging is reduced by up to 90  %. The measuring unit records the topography of the fine film web and then sets the correct production parameters. Reifenhäuser will be demonstrating at its booth how this ultra-flat measurement with integrated closed loop control functions. 

Reifenhäuser at K 2019 

Measurable Flatness, Increased Sustainability and Progressive Digitalization  

The Chinese global film supplier invests in two 7-m sequential film stretching lines for the production of BOPA films. 

Xiamen Changsu orders production line for BOPA film 

Brückner delivers sequential film stretching lines 

Cracks often appear on screws and unsettle customers. The manufacturer EJS is often confronted with this effect and has got to the bottom of it. 

“Hardy, we received your screws. Are you sure your people have done the inspection? Look at the crack, I think any people will see this clearly. How can we install such a screw on our machine? How fast can you get us a new screw? We need it now. Please let me know. ” As a screw manufacturer, EJS often receives such complaints.

When the first 125 hard-facing screw was ready for inspection, the employees at E.J.S Industry Co., LTD, Ningbo/China (EJS), noticed that there were cracks on the screws. How could that happen? 
Was it caused by bad temperature control, or bad bimetallic alloy powder, or bad base steel, or process management? To find out why, a lot of tests were scheduled and a lot of labels were sticked on the product for later identification. After a lot of trial and error, EJS came to know WHO was the mother of cracks and their relationship. 

Hardfacing screws are normally processed by a PTA welding machine. The energetic plasma arc has a high temperature more than 1000℃ to melt the alloy powder, which is to be welded into the flight one by one until it’s completely finished. During this process, the thermal expansion and cold contraction happens inevitably and repeatedly due to the big difference between 1000℃ and the ambient temperature(5℃ to 40℃). 

Since 2015, EJS had a special furnace to keep the hardfacing screws warm for certain hours after PTA welding, which do help us to reduce the numbers of cracks. Unfortunately some cracks are still there, big or small, more or less. Is there any way to get rid of them? 

As a quality-oriented company, EJS tries everything to avoid cracks. However, it is not possible to completely exclude the possibility of cracks forming. The company consulted senior engineers, checked with experts, analyzed together with experienced production managers and sought advice from long-term customers in different countries. Finally EJS accepted the fact that cracks are inevitable for some alloys on big sizes, because no cracks means soft flights. There are some alloys which you cannot avoid micro cracks. They always exists. 

When the cracks are intense, AND the flights always stay - it is acceptable. When the cracks are long, AND the flights always stay - it is acceptable. When the cracks are wide, AND the flights always stay - it is acceptable. When the cracks are regular in one direction - it is acceptable. If the crack causes the peal-off -  it is NOT acceptable. 

Using these simple questions, customers can check whether their screws are OK or not. In case of doubt, the experienced EJS staff will be happy to help. 

<a href="http://www.ejschina.com">www.ejschina.com</a>

10597133 News Beitrag [Online] - EJS 1.4.2020

issue 04/2021

issue 03/2021

issue 02/2021

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