Category: Industrial

Thermoplastic polyurethane or TPU is a category of plastic with outstanding versatility that designed to meet manufacturing challenges of the modern world because it improves the production and performance of any type of product from shoes to filters and cables. Practically, high temperature polymers are useful for a large number of global industries, from automotive and aviation, construction and agriculture to healthcare. After many years of development, companies managed to create various TPUs with the goal to fulfill application requirements including adhesive, injection molding and compounding. When being exposed to heat, this polymer becomes soft. When cooled, returns to a hard structure. However, the great advantage is that thermoplastic polyurethane stands more than one processing without affecting its integrity. Other characteristics of this type of plastic include high elasticity and elongation, resistance to abrasion and chemicals, tensile strength. For these reasons, TPU is very popular among different markets and applications.

Types of thermoplastic polyurethane

High temperature polyurethane can be divided into three classes, namely polycaprolactone, polyether and polyester. Polycaprolactone TPUs are perfect for pneumatic and hydraulic seals because they present resistance to hydrolysis Polyether TPUs present excellent resistance to hydrolysis, good abrasion and durability against microbial degradation, which makes them ideal for watery environments. The last category of TPU and probably the most familiar is polyester, which offers resistance against abrasion and protection against chemicals and oils, thanks to its intensified properties. It is mostly used in polymer blends or mixtures.

Common traits of TPUs

Regardless of the company that produces them, TPUs must have some common traits in order to differentiate them from other materials. These characteristics refer to the performance of thermoplastic polyurethane and include flexibility, excellent impact strength, resilience to various solvents and grease, high elasticity and abrasion resistance, recyclability. Moreover, they must be pleasant to the touch and easy to color. Manufacturers have the ability to change their physical attributes in order to meet specific requirements in terms of application. Practically, they need to adjust the ration of materials used to produce thermoplastic polyurethane, use additives like mold release agents and change the reaction conditions.

Measurements used for TPUs

Companies use several assessments to measure the longevity and performance of TPUs. The standard measurements include abrasion, shore hardness, tensile and tear strength and shrinkage. Shore hardness has the goal to measure the resistance to penetration or indentation by applying a defined force on the thermoplastic polyurethane. This allows a clear categorization: rigid or flexible. The tensile strength has the purpose to determine the level of endurance before deformation occurs and the tear strength show the ability of resisting distortion or break. Manufacturers encounter difficulties when establishing the shrinkage degree accurately because various parameters influence this action.

Chemical properties are of great importance because they control the thermoplastic polyurethane behavior in different environments. Thus, manufacturers must think about high temperatures and outdoor elements that might negatively affect the TPU and carefully analyze its concentration and formulation. Shortly, the finished product must present high chemical resistance when encountering specific substances, including saturated and aromatic hydrocarbons, especially in medical and industrial environments. Companies have high standards in relation to thermoplastic polyurethane.

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The hydraulic system is incomplete without pressure control valve. This makes them an essential part of every hydraulic device. There are a number of functions which are performed by this device. The upper pressure is not only maintained but these devices also ensure that a particular pressure is maintained in a certain part of device or circuit to which it is associated. The two main types are open and closed valves. Both are used in various industrial applications. An example of the closed valve is unloading and that of the open valve is a relief. The concept of this appliance is not simple and thermodynamics are applied while these are manufactured. Basic of the device are as follows:

Cracking pressure

There are several other terms which are related to cracking pressure or without which the term cannot be explained. Some important definitions are as follows:

  • The type of pressure at which for the first time pressure control valve allows the fluid passage is known as cracking pressure.
  • The point at which the valve bypasses the full flow is known as full flow pressure.
  • The difference between cracking pressure and full flow is known as pressure override

The device is both auto and operator driven. Pressure override isn’t a problem in some issues but most of the time it is. Pressure override can lead to power wastage and this is its greatest disadvantage.

How pressure control valve works

The working of pressure control valve is just like an electrical circuit. The main concept is to save the circuit. Till the amperage of the circuit is below fuse value everything is fine. When the amperage tries to exceed or actually exceed the fuse value it blows. Though it destroys itself but saves the circuit at the same time. The pressure control valve on the other hand ensures that the best alternative path is given to the fluid if hydraulic system pressure reaches the maximum point. For every hydraulic system pressure control valve is a very important as it makes sure that the system is never damaged. Due to the flow of fluid when the pressure reaches the maximum level pressure control valve opens to bypass the fluid. The process continues till the pressure falls. Most of the pressure control valves are automatic in nature and therefore no human intervention is required. There are many types of pressure control valves in the market and depending upon the configurations work for different hydraulic systems.

Some benefits of control valves

To understand the operation of pressure control valves in full some advantages of the device are as follows:

  • The flow of fluid is human independent. No operator is required to control the process and hence it is one of the best ways to maintain system pressure.
  • Both time and effort of the users are The deployment of pressure control valve is very simple and easy to perform. There is no need of any plumber or technical assistance.
  • The pressure control valves are also power savers as they neither waste resource nor let the system do that. Efficient working is a big plus when it comes to these devices.
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The most common gantry cranes feature two supports. One of the pillars can be rigidly connected to the axle (rigid or spatial support), and the other one is hinged (flexible or flat feet). In gantry crane with a span (distance between the crane rails) of less than 25 m both bearings are hard. Track each of the pillars of heavy crane (lifting capacity of 1,000 tons or more) may consist of two or more rails (undercarriage in this case have the spatial equalizer suspension). In some cases the rails are placed at different levels of support at different heights. The semi-crane design implies the bridge resting on one side of runway, and the other one – on the support legs. Trucks are moving the bridge crane. The mechanism of the trolley as lifting mechanism can be mounted on a trolley (autonomous trolley) or on a metal bridge structure. Lifting mechanism is oftentimes mounted on the metal, and a truck equipped with a movement mechanism. Gantry crane has a metal structure: mechanisms of lifting cargo, the trolley and crane movement. Grab cranes are equipped with a special gripper and winch mechanism in the presence of lifting mechanism circuit grapple. If there is a need for orientation of cargo, the carriage is provided with a rotatable part as steel truck cranes.

Trolleys mechanism

The weight of cable trolleys considering the weight of cargo and towing winch accounts for 5-10% of weight of the nominal load. The cable trolleys are used only by cranes of group mode of 1K – 3K, since rolling cargo rope pulley block on blocks significantly increases the resistance of the trolley, which leads to accelerated wear of the rope. To prevent excessive sagging hoist rope it is necessary to increase the mass of the cargo suspension. Suspension trolley for these cranes is typically produced in two type: monorail and double rail.


At monorail cable trolley to reduce bending moment, bending monorail suspension frame blocks are made with spherical support elements. In addition to the limited life of the monorail, an unsustainable position of the truck cab and in the transverse direction. Lateral swinging carts and mobile booths, which can not be rectified using the thrust rollers adversely affect the working conditions of the crane. In the event of lateral loads on the trolley or in case of eccentricity in mechanisms to traverse when lifting cargo pressure rollers have an impact on the bottom chord of the bridge. In some cases, the design implies additional monorails, which increases metal consumption structure. This solution is widely applied in case of heavy loads and work on sophisticated sites, the design is practised by such industry innovators as Granada Material Handling, gantry hoist and overhead crane manufacturing experts supplying the demand across UK and EU markets.

Double rail

The most common type of cranes implies trolleys moving on rails laid on the lower belt. The frames of these trucks ensure uniform load distribution on rail guides. When using trucks with cargo winches at one end of the frame the hinge connection for crossbeam carrier racks with running wheels is hinged. The cable trolleys cross member is attached to the end of a beam on with the pulleys. In this case, the reduced height of the trolley, which allows the frame of beams running wheels mounted on the ends of the axis of the crossbar. To improve the layout of joints resistant to the bridge, in the small-sized motorized vehicles gears are used or gear movement is performed with central drive.

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In the modern field of metalworking, mechanical method of working with steel alloys is constantly evolving. However, technological progress contributes to the emergence of new, high-tech materials that can hardly be subjected to mechanical stress. Therefore, many productions began to switch to a completely new, high-tech treatment. Ultrasonic machining is a decent example of a modern technology that can not only solve complicated manufacturing tasks, but also be cost-effective. The article is prepared in collaboration with Hilsonic experts, representing the ultrasound technologies-focused company, known for the ultrasonic cleaner lineup in the local UK market.

Ultrasonic method of processing is one of the varieties of slotting material handling. The removal of the surface layer with the product is carried out through the emergence of micro cracks under the influence of ultrasound vibrations. The main primary quality of ultrasonic treatment in metals considers the possibility of working on a non-conductive material and an opaque type. As well as the positive characteristics of this method of working with materials, one can designate the absence of residual stress at the end of the working process, which can cause formation damage (cracks) to the product surface. Sonication method is used when dealing with fragile components such as agate stone, plaster-based materials, diamond products and gypsum elements. (more…)

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