Can I Use Hot Runner System to Produce Mobile Phone Cases and Keyboards?

Nowadays, hot runner system and cold runner system are two of the most popular methods for plastic injection molding in the world. Here comes the question. If you would like to produce mobile phone cases and keyboards, which system you should use?

The main difference for two systems is that the later one can inject plastic directly into the part cavity. This direct injection keeps the runner at a high temperature. The only component that needs to be removed in each cycle is the part itself. Therefore, the mold can be circulated again very quickly. Since the injection point is much smaller, the final plastic product looks better, thus achieving high details and smooth surfaces. Increased cycle time and reduced plastic waste make it ideal for mass production.

The choice of nozzle material is related to the production efficiency, cost and quality of the finished product. Titanium-zirconium-molybdenum (TZM) alloy is a particle-reinforced molybdenum-based alloy containing titanium, zirconium and carbon. It is widely used in aerospace, aviation and other industries, and can be used as nozzle material, valve body, gas pipeline material, gate tube material, die-casting mold, heating elements and heat shields for high-temperature furnaces, etc.

Compared with pure molybdenum, TZM alloy material has better creep resistance and welding performance, and a higher crystallization temperature. Due to its excellent high temperature performance and corrosion resistance, TZM rods are often processed into nozzle tips for hot runner systems.

At the same time, the system is also accompanied by some shortcomings, such as the system itself is larger and more complex, resulting in longer setup time and increased installation costs. Different systems are suitable for different products. Hot runners are suitable for mobile phone cases, bottle caps and items that require a lot of cheap parts; cold runners are suitable for keyboards, electronic casings and covers that can hide defects, and small batch production. Understand the inherent advantages and disadvantages of the two systems in order to choose the most suitable for their actual production needs.

Chinatungsten Online are professional manufacturer of molybdenum for more than two decades. If you have got the purchasing plan for TZM rod, please feel free to contact us. 

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How to Install Different Shapes of Molybdenum Glass Melting Electrodes?

Molybdenum glass melting electrodes are used to deliver electrical current into glass melts as they can resist to corrosion and oxidation at high temperature. Made of high-purity molybdenum powder and after sintered and forged, electrodes can be formed into different shapes, such as rod and plate. 

The installations of different shapes can be various, and represent their own advantages and disadvantages. 

1.Molybdenum threaded rod

The electrode can be installed from the bottom, broadside, top of the furnace. In the all-electric melting furnace, different combinations are used according to different glass types and furnace types. Commonly used are multiple sets of flat inserts, flat inserts + bottom inserts, bottom inserts + inclined inserts, top inserts + horizontal inserts, top inserts + bottom inserts.

Flat insert: it is the most widely used installation as it is very simple to operate. However, the electrode is easy to become thin and bent, and be corroded by glass melts. 

Vertical installation (bottom insert and inclined insert): it is often used for borosilicate glass. With this installation, the electrode will not be adjusted frequently and the furnace will obtain longer service life. Its advantage is that furnace structure is complicated. In that case, it will be strict for installation. 

Top installation: it is mostly used in glass and various furnace structures, without contact with the lining material, which can increase the service life of the furnace. But it requires high operation accuracy and needs regular inspection.

2. Molybdenum electrode plate

The plate-shaped electrode can be used in melting tank or picking tank. When used for melting, the glass flow is stable and the melting is uniform, which is shallower than the melting pool using rod electrodes. When used in the picking tank, the current density is low and will not cause secondary bubbles. 

Chinatungsten is a professional manufacturer of molybdenum for more than two decades, and molybdenum electrode is one of most outstanding products. 

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Molybdenum Disulfide (MoS2) Boosts the Development of New Energy Vehicles

In recent years, new energy vehicles have shown a momentum of rapid development along with policy guidance, influx of funds and improvements in technology. Oil is the most important product in the lubricating grease industry with engine oil accounting for more than half of the total lubricating oil products. The development of new energy vehicles will definitely have a huge impact on this industry.

Compared with traditional fuel vehicles, this kind of vehicle only reduces engine oil. Other gear oils, greases, transmission oils in the transmission system, coolants, brake oils, and automotive auxiliary products are also needed. In addition, the current automobile design structure has little change in the quality requirements of lubricants, and most of them are still using the original varieties.

With the development of technology, the new vehicles may go out of their own way, and the working environment and system of lubricants will be more complicated and professional. OEMs will put forward their own requirements for lubricants and grease companies, such as insulation performance, electrical performance, safety performance, high temperature performance, high speed performance, corrosion performance, environmental protection performance, etc.

High-viscosity, longer oil change intervals and compatible products that adapt to more complex lubricating oil systems will be the future trend of automotive lubricants

Molybdenum disulfide (MoS2) is known as the "King of Solid Lubrication". With the characteristics of good dispersion, strong chemical stability, high temperature resistance, extreme pressure resistance, etc., it is widely used as an additive in lubricating grease and other industries.

If you have any inquiry of MoS2, please feel free to contact us:
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Why Can Molybdenum Disulfide (MoS2) Be Used as Solid Lubrication

As we all know, molybdenum disulfide (MoS2) is very popular in the world as solid lubrication. In the mid-19th century of the California Gold Rush, it was firstly used as a lubricant for carriage bearings.

During World War II, the Max Planck Institute in Germany and the National Aeronautics Commission, the predecessor of the National Aeronautics and Space Administration of the United States, conducted experiments on the use of MoS2 for industrial applications and developed organic bonding solid lubricating film. By the early 1950s, the United States formulated the US military standard for this material and regarded it as a military secret.

Subsequently, molybdenum disulfide sputtering film and ion plating film appeared one after another. In emerging industrial sectors and emerging technical fields, solid lubrication is gradually being applied. For example, in electronic machinery based on robots and electronic computers, its main lubrication parts are commonly used PTFE and lubricants.

As a solid additive, how can this material play its lubricating effect? 

Actually, its good lubricating performance is closely related to its crystal structure. The bonding force between the sulfur atoms and molybdenum atoms in each molecular layer is very strong while the bonding force between the sulfur atoms and the molybdenum atoms between the molecules is very weak. as a result, a low-shear plane is formed. When a small shear force is applied between them, it is easy to break along the molecular layer and form a slip surface.

For example, there are 800 molecular layers and 799 slip surfaces in a surface film with a thickness of 0.5 μm. These numerous sliding surfaces convert the original relative sliding direct contact between the two metal surfaces into relative sliding of the moly disulfide molecular layer, thereby reducing the friction factor and reducing wear. MoS2, under some special preparation conditions, can react with the metal surface under extreme conditions to form a protective film.

Chinatungsten is committed to producing molybdenum disulfide powder and would be honored to offer you our products no matter in which industry. 

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What’s the Role of Molybdenum Electrode in the Production of Glass Fiber Insulation Material?

Glass fiber, its size is extremely fine from few micrometers to twenty micrometers, which is equivalent to 1/20-1/5 of a hair. Each bundle of fibers consists of numerous extremely fine fibers of glass. However, don't be fooled by its size. They are fine but strong enough.

The material is first well known as thermal insulation material for buildings. So far, its biggest application is to be used as insulation and reinforced composite materials. Wind turbine blades, watercraft and thousands of other products are strong and lightweight because they are made of this material. Many people don't even realize that glass is made and use as fiber form. It is a material that will not attract people’s attention, but is common and essential to modern life.

Rarely, it can be used in the file of medicine as well. In recent years, scientists have been committed to researching and developing a bioactive glass nanofiber for animals and humans, and successfully extracted nanofibers from bioactive glass species through laser spinning technology. The fiber can heal chronic skin ulcers and deep wounds. The antimicrobial fibers that gradually dissolve and are absorbed by the tissue release bioactive ions in the wound, thereby stimulating the growth of blood vessels and promoting tissue healing.

How is the fiber produced?

To form fibers in the 5-to-20-µm-diameter range, manufacturers deliver molten glass to an extrusion equipment that drives the molten glass through nozzles with thousands of small holes. The setup and processing steps vary according to the type of fiber to be produced. For example, manufacturing glass wool fibers for insulation was initially similar to manufacturing marshmallows. The fine glass liquid flows out horizontally through the holes in the rotating rotator and quickly solidifies. After that, they are shredded by a burst of air flow, and then blown down onto the moving conveyor belt, where they are collected and formed into insulating products, such as wool, cushions and boards.

The key to ensuring fiber quality lies in the quality of molten glass. In addition to ensuring the quality of raw materials, manufacturers will purchase pure molybdenum electrode with high purity, corrosion resistance and good oxidation resistance for use in glass electric melting furnaces to melt glass. In this way, the finished products such as fibers and glass bottles will not have any defects, such as coloration, streaks, etc.

If you have any inquiry of molybdenum electrode, please feel free to contact us:

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