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  

Blasfolienextrusion

Extrusionswerkzeuge

Extrusion

Higher Speed for Material Exchange 

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 

Kunststoffverarbeitung: Maschinen und Komponenten

Folien

Brückner delivers sequential film stretching lines 

The EMVA announces that based on the high dynamics of the COVID-19 pandemic development the EMVA Business Conference 2020 in Sofia is cancelled.  

One-day Conference in Online Format is Planned for June 

Spritzgießmaschinen

Europa

EMVA Business Conference in Sofia is Shifted to 2021 

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  

Colines spa, Novara, Italy, has developed a system for the production of high range thickness CPP, CPE and multilayer barrier film, from 15 to 500 micron, called “Thick&Thin”. 

Cast Unit for Cast Film Extrusion 

Thick and Thin 

The finite elements method was used in the past almost exclusively for calculating simple extrusion dies or die segments. More recent developments now enable it to be used for more complex dies, too. 

Spritzgießsimulation

Pipe Extrusion: The Calculation of Spiral Mandrel Dies 

A new extrusion system allows changes of diameter during production. This capability increases productivity while reducing personnel and material costs. The greater production flexibility additionally shortens delivery lead times and cuts inventory. 

Pipe Extrusion: Dimension Changes in Running Pipe Production 

A new approach to assessing spiral mandrel dies is presented. It determines the spiral lines at the die outlet, which can be seen after colour exchange tests. They are characteristic of the die. The simulation by finite element analysis (FEA) is compared with experimental results for various examples. 

Spiral Mandrel Dies: Uniform Melt Flow from the Spiral Mandrel 

On the occasion of a profile symposium held in Vienna on 21 and 22 May, Hans M. Berlisg, Marketing Director at Cincinnati Extrusion, provided the specialist press with information on current developments and on the company’s latest facts and figures. 

Product Exhibition: All Nicely Lined Up 

Flexible die walls that can be adjusted to requirements are already to be found in some applications. Flow-channel walls that can be adjusted particularly during production can lead to potential savings and offer new process-engineering possibilities. 

Die Optimisation: Flexible Die Walls 

The computer model for designing slit dies and spiral manifold dies taking into account the entire flow path has been successfully transferred to industrial use. This model allows determination of the melt distribution in the individual die designs as a function of the flow properties of the melts being processed. The effects of the regions connected to the manifold channel, such as restrictor bars, parallel guides or relaxation zones are also included in the analysis. 

Platten

Die Design for Pipe and Sheet Extrusion: Simulation Model Confirmed 

Surface roughness of extrudates is an economic problem in the extrusion of various polymers. It limits the output rate of the extrusion line. The flow properties and melt fracture properties of a polymer can be selectively influenced by suitable choice of die materials. 

The Die Material Influences the Melt Flow Behaviour: Plastic Extrusion Dies 

Correct dimensioning of the screw is a vital factor for the cost and quality of extruded products. Designing single-screw extruders is only possible if a large number of simplifications and assumptions are made. Most machine manufacturers have specific know-how in certain areas of application when it comes to selecting the screw geometry. This well guarded knowledge is part of a company’s capital and is developed further through the search for new designing methods. 

Simulation Is Not Easy: Design of Single-screw Extruders 

Spiral mandrel dies have significant advantages over other systems for the production of multi-layer pipes. In fact, some product developments have only really become possible as a result of this concept. Multi-layer pipes can be produced not only by the coextrusion technique, but also by sheathing with crosshead dies. Here, too, spiral mandrel dies have certain advantages. This article deals with various principles for designing spiral mandrel dies, reporting on systems that have been used in practice and on the experiences gained with them. 

Designing Spiral Mandrel Dies: Dies for Multi-Layer Pipe Extrusion 

It is difficult for new process technologies to become established in extrusion technology. A number of the reasons for this are the high line costs, the low number of new lines being installed, the risk of a new technology not giving the desired results after all and the high costs of the tests required on production line. Despite this, new ideas and solutions are repeatedly emerging which are aimed at both reducing the production costs of extruded products and improving product quality. 

Further Developments in Die Technology and in Measuring Systems: Innovations in Extrusion 

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

Extrusions-Zubehör

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