LSR optics offers a wide range of applications due to the optical brilliance, the possibility to produce undercut shapes not to mention the competitive pricing. The adhesive surface which is almost impossible to clean however makes the LSR parts vulnerable against contaminations. This characteristic however limits the possible application fields. To overcome this limitation Wilhelm Weber has partnered with Fraunhofer IFAM in a recent research project.

Surface Modification of LSR Components Hinders Adhesion of Dirt

Spritzgießen

Kunststoffverarbeitung: Verfahren

LED / OLED-Systeme und Faseroptik

Lichttechnik

Elastomer-Spritzgießen

Oberflächentechnik

Silikonkautschuk

Kunststoff Werkstoffe

Kautschuk / Elastomere

No Chance for Dust and Contaminations

A year to forget is nearing its completion. To brighten up this dreary fall season without a major event like Fakuma, injection molding machine builders have concocted various strategies.

Injection Molding Machine Builders Are Discovering New Ways to Reach Their Customers

Spritzgießmaschinen, allgemein

Kunststoffverarbeitung: Maschinen und Komponenten

Spritzgießmaschinen

Vernetzung / Cloudlösung für die Kunststoffverarbeitung

Industrie 4.0

Industrie 4.0 für die Kunststoffverarbeitung

Biokunststoffe

Nachhaltigkeit

Umweltmanagement

Schneidmühlen

Kunststoff-Aufbereitung

What Can You Do at Fall Fairtime,  When There Aren’t Any?

Space-saving machine concepts for demanding production environments are booming. A real-life example of a slit micro-membrane for pharmaceutical glass vials shows how intelligent machine functions make an important contribution to supporting machine operators and continuous documentation of the production process.

KraussMaffei Delivers a Customized Solution for LSR Processing

Automatisierungszellen

Automatisierungstechnik

Mikrospritzgießen

Medizintechnik

Medizinprodukte

Transparency in Production

Emerald‘s high performance antioxidants, plasticizers, nucleating agents, epoxy resins and modifiers are the key components you need to ensure lasting performance and optimize processing characteristics. Today‘s toughest, most flexible plastics rely on Emerald‘s innovative chemistry and expertise. Featuring:

Additive

Antioxidantien

Beschichten von Kunststoffen

Chemisches Bearbeiten (Auftragen)

Beschichten von Metallen, allgemein

Duroplaste

Farbstoffe

Harze

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Chemisches Fügeverfahren

Verbindungstechnik Verfahren

Lackieren

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Silikone

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Verarbeitungshilfmittel

Verbundwerkstoffe / Werkstoffverbunde

Vernetzungsmittel

Weichmacher

Emerald Performance Materials

In the production of rigid/flexible combinations, either thermoplastic elastomers (TPE), rubber, or liquid silicone (LSR) are used as the flexible component, depending on the case in question. As a specialist producer of multicomponent injection-moulded parts, Weigelt has a great deal of experience in processing all three materials. There are a number of challenges to be mastered when it comes to the application technology, however... 

Composite Parts: Flexibility in Rigid/Flexible Combinations 

Elastomeric materials are increasingly making their presence felt. For the thermoplastic segment in particular, color is becoming increasingly important, but haptics are also playing a large role. What was new at K2010 were the first attempts to produce scented elastomers in order to address the most sensitive of all human sensory organs – the nose – as well. 

Trends at the K 2010 Fair: Appealing to (almost) all the Senses 

In addition to improved plant technology, new materials are being developed for additive manufacturing processes. These include elastomers which, by their irreversible cross-linking, have a different behavior than thermoplastics. An investigation shows that commercially available silicone rubbers can be processed via additive manufacturing – with high strength in relation to conventionally manufactured silicone rubbers. 

Silicones as a Material Group for Additive Manufacturing on the Test Bench 

Additive Fertigung

Elastomers of the Third Dimension 

Not only on Earth do elastomers make an important contribution to everyday life in demanding applications but they are also in demand for satellites or probes. Alongside typical worldly properties such as temperature and chemical resistance, materials deployed in space are subject to other conditions specific to this environment, such as enormous centrifugal and gravitational forces. These place special demands on the polymers we are familiar with.  

Properties of and Demands on Silicone Rubbers in the Space and Aerospace Industry 

Compound

Compoundeure

Galactic Compounds 

In a world of high tech and future visions, a renaissance is taking place in our interest in the values and works of former ages. Conserving and preserving our cultural heritage are thus ongoing concerns, in which silicones have a firmly established position. 

Silicones: Preserving a Heritage 

The importance of the feel of a manual tool, power tool or gardening tool and the fact that it offers a firm grip should not be underestimated when it comes to product assessment. If a handle is uncomfortable and cannot be held securely in the hand, then this will affect the ease of operation and the efficiency of the tool. Designers and manufacturers must therefore pay attention to a whole range of factors – but above all to comfort, a secure grip and safety. 

Tools: A Better Grip 

In the meantime, they have become an absolute necessity in the automotive industry: since, in contrast to organic rubber compounds, silicone elastomers can withstand very high and very low temperatures for extended periods of time, while at the same time resisting ageing and weathering. They will continue to gain in importance with respect to future requirements. 

Silicone Elastomers: An Attractive Alternative 

At the Arburg Technology Days, four cooperation partners introduced a new technology. For the first time, liquid silicone rubber can be foamed with physical blowing agents in the injection moulding process. The process opens the door to the production of parts with completely new properties. 

Market Launch: Foamed Liquid Silicone Opens New Doors 

Systems for automatic balancing of hot-runner systems are now used extensively in a wide field of applications and have proven especially successful in medical technology. This experience has led to the development of control applications for specialty areas, such as ceramic injection molding and processing of liquid silicone (LSR). This necessitated modifying the control systems to widely differing requirements. 

Steuern, Regeln

Keramik

Hot-runner Control: The Time is Ripe 

The incandescent light bulb, once the pioneer of a global lighting revolution, is disappearing from stores. It has long been superseded by a new generation of light sources. These new lighting technologies are driven by energy-efficient light-emitting diodes, or LEDs. Now, a newly developed UV-curing silicone has created the breakthrough necessary for their inexpensive mass production. It will allow optical lenses to be produced directly on the LED chip. 

UV-Curing Silicones: Saving Time and Costs 

Wacker Chemie AG, Munich, Germany, has developed a new product range of liquid silicone rubbers. Elastosil LR 3040 is characterized by a high cross-linking speed combined with a high tear propagation resistance, also known as notched strength. The liquid silicones can be processed by injection molding, but allow significantly shorter cycle times to be achieved than for standard liquid silicone rubbers with the same mold temperature. At present the materials are available in the hardness range from 40 to 50 Shore A. 

Give me a Bite 

Liquid silicone rubbers 

Thermally Conductive LSR with Short Processing Time

At Fakuma, Momentive Performance Materials will be showcasing thermally conductive liquid silicone rubber (LSR) grades designed for high-temperature applications.

These LSRs, known as NL9360 and NL9330, have a thermal conductivity that renders them ideal for dissipating heat from sensitive components. They are intended for use in, e. g., the manufacture of components found in the drive and charge-management systems of electric vehicles and for other electronic devices. Thermally conductive NL9360, which has a hardness of 60 Shore A, is designed for injection molding and, says Momentive, combines short processing times with high stability and flexibility. It has a low compression set of just 10 % and a thermal conductivity of 1.5 W/(m·K), or about five times that of conventional LSR. NL9330, which has a hardness of 30 Shore A, is said to be just as thermally conductive and has also been developed for injection molding. It has a compression set of just 9 %.

Both LSRs have been specified for the production of heat-conducting pads and gaskets, as well as cooling units under the hood. Momentive claims they are resource-efficient and low-maintenance due to their low weight and longevity, compared to alternative materials.

The polymers manufacturer will also be exhibiting low-temperature-cure liquid silicone rubber (LTC-LSR). This crosslinks at just 110 °C, and thus at a significantly lower temperature than hitherto available types. According to Momentive, tests showed that the mold temperature can be reduced by 30 °C as a result, without the need to extend the heating time. Instead of lowering the processing temperature, there is also the possibility of reducing the crosslinking time, relative to that of a standard LSR. Apparently, it can be reduced by up to 45 %.

According to the company, this also opens up new material combinations for LSR, such as a combination with heat-sensitive polymers. Downstream annealing is not required. Parts are produced faster and the risk of burns during demolding is reduced. At its booth, Momentive will be demonstrating how the material is processed on an electric Allrounder 470 A injection molding machine from Arburg.

Momentive Performance Materials GmbH 

https://www.momentive.com

Processing of the low-temperature-cured LSR will be demonstrated at Momentive’s booth

2021-10-03 werkstoffe_Momentive

Messe Fakuma

kunststoffe-international.com

issue 08/2021

issue 07/2021

issue 06/2021

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