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Following the successful launch of the MOGENSEN MSizer Extend in 2017, Allgaier Process Technology has expanded its MSizer portfolio with two more models: the MSizer Compact - a short-deck-sizer with high screening performance, large capacity and a small footprint, and the MSizer Giant - the world's most powerful sizer.
The MSizer is based on the Sizer screening technology developed by Fredrik Mogensen more than five decades ago, with several screen decks arranged on top of each other, with the topmost screen having the smallest and the bottommost screen having the greatest inclination. The machine has been adapted in terms of technology, design and function principle to increased needs based on state-of-the-art simulation methods and numerous tests in the MOGENSEN technical center. High screening qualities and quantities can now be achieved because of optimized excitation of the screening decks that could not be realized with the previous technology. Thanks to the new screen deck concept and the changed inclination angles of the screens, the MSizer combines highest operating efficiency, as well as robust and compact design with significantly reduced operating costs.
The MSizer Compact replaces the previous short-deck-sizer MOGENSEN G-Sizer. The sophisticated technology was further optimized. It is driven by a single vibrator resulting in the typical elliptical motion pattern that counteracts blinding of the screens and loosens and stratifies the feed material. This secures an efficient material spread. Thus the MSizer Compact achieves a throughput of over 40 t / h e.g. for feed screening. The design of the inlet and outlets allow for a flexible configuration. Each machine is customized to specific requirements. The MSizer comes in four sizes, with inner widths ranging from 0.5 m to 2 m, reflecting the capacity, and with 1 to 4 screening decks. Due to the maximum volume, the MSizer Compact is mainly targeting the food and feed industry, but can also be used for other applications.
The new MSizer Giant is the most powerful and flexible long-deck classifier machine based on the Sizer principle. With a throughput of over 80 t / h, e.g. when screening granulated sugar, the MSizer Giant becomes the largest sizer in the world. Similar to the MSizer Extend, the screen coverings are set into defined linear movement by 2 vibration motors or exciters. The MSizer Giant is built exclusively with 3m working width and with a screen deck length of 3.35m; optionally with 2 to 6 screen decks. Thus, the MSizer Giant is suitable for all applications that require extra volume, such as sugar or building materials. This makes it possible to reduce the number of Sizer or conventional screening machines in large production plants and with it effectively reduce the investment costs in infrastructure and maintenance.
The gap between the two new models is completed by the fully optimized MSizer Extend, which was already introduced in 2017 and can be used in almost all bulk material applications. It is available with a machine width of 1m to 3m, a screen deck length of 2.4m and with 2 to 6 screen decks depending on the fractionation requirement.
All MSizer series are available with a new machine control and integrated fail-safe vibration monitoring which drastically minimizes the risk of failure and ensures safe and durable operation. In addition, all MSizers are offered on request for use in potentially explosive operating environments as an ATEX version.
With the expansion of the MOGENSEN MSizer product family, Allgaier Process Technology is able to respond specifically to the requirements of customers from a wide variety of industries and further offers an digital service with the ProcessApp in addition. Customers can now use the Allgaier Service2Go via smartphone or tablet and request spare parts directly from their machine or contact the manufacturer. By scanning the machine QR code on the MSizer itself, the machine can be identified immediately and customers have access to a digital twin an interactive drawing of their machine. In addition to the spare parts order, the documentation of the specific machine can be viewed at the production site. Also in the case of planned maintenance or in the event of a fault, it takes only one click to establish contact with the Allgaier Process Technology service team. The app is available in 5 languages in German, English, French, Spanish and Swedish.
Allgaier Process Technology Custom-Tailored and Innovative Solutions for the Bulk Material Processing Industry. Extensive experience makes the Allgaier Process Technology division the preferred partner when it comes to anything related to process engineering and technology. With its Allgaier, Mogensen, Gosag, and Mozer brands and a worldwide ...
This is why Titan Flow Control has created the following guide to assist you in (1) understanding the standard, as well as exotic, basket and screen configurations offered by Titan and (2) determining which design is best suited for each application. As always, a Titan FCI engineer is available to answer any questions that you may have and to assist you in developing a solution for your straining requirements.
Titan Flow Control, Inc. manufactures high-quality screens and baskets for Titan strainers and for competitor's strainer models at our own facility in Lumberton, NC. Titan has an extensive inventory of pre-made screens and baskets, a wide variety of perforation and meshes, and an experienced screen department to ensure that each screen or basket is well-made and shipped to you as quickly as possible. While our competitors may quote lead times of 4 to 6 weeks, Titan is often capable of shipping screens and baskets in 4 to 6 hours!
To find the wye strainer that is right for your project or job, its important that you know how mesh and screen sizing works. While deciding which size strainers to purchase, you need to consider both the micron and mesh values. Use our Micron and Mesh Comparison Chart to determine the best strainer for you.
Micron and mesh size are measurements that are used to describe different sizes of wye strainers. While these two types of measurements are expressed differently, they both describe the same thing the measure of the size of the openings in the strainer that materials pass through. The mesh or micron size will tell you what size particles will be stopped, or strained, from the liquid flowing through the strainer.
Micron is short for micrometer. Its a unit of length that is used for measuring very small particles. A micrometer is defined as one-millionth of a meter which is equivalent to about one twenty-five thousandth of an inch. The micron value of a wye strainer indicates the size of particles it will filter out.
Mesh size is fairly straightforward. It measures the number of openings in the mesh that make up one linear inch. For example, a 12 mesh screen means that there 12 openings across one inch. A 120 mesh screen means the openings are much smaller and that there are 120 openings per inch. The higher the mesh number, the bigger the particles that are allowed to pass through the strainer.
As you can see, microns and mesh size measure the same thing, but differently. Micron measurements tell you the size of the opening in the strainers, thus what size particles it will capture. Mesh size tells you how many openings there are in an inch, which can be calculated to provide you with the same information.
The following chart will help you understand mesh sizing in more detail. For example, a size 12 mesh screen has openings that are 1680 microns and a size 100 mesh screen has openings that are 149 microns. When the mesh screen size gets to higher than 400, measurements are typically expressed in microns only. At those sizes, its the most accurate way to measure.
Because wye strainers are used in various industries, the material of the strainer and the size of the mesh screen that is used for a project or job have to be determined on an individual basis. The type of pipe system, the material that is used in the system, the size of the unwanted particles to be captured, and the pressure and temperature involved in the system are all considerations to keep in mind as you decide which wye strainer is best.
One thing to keep in mind about mesh sizes is that they are not exactly precise. Screens are constructed with different materials. That means that there are different thicknesses of the wires or strands depending on the material. In other words, the thicker the material, the smaller the openings will be.
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A simple definition of a screen is a machine with surface(s) used to classify materials by size. Screening is defined as The mechanical process which accomplishes a division of particles on the basis of size and their acceptance or rejection by a screening surface.
Knowledge of screening comes mainly from experience. However, through experiment, test facilities and compilation of field data, reliable criteria have been developed by screen manufacturers. This factual data is now tabulated for use in selecting the type and size of screen best suited for the job.
The most common application of a vibrating screen is to separate an unconfined conglomerate of materials into different size fractions. Other popular uses of screens are scalping, washing, dewatering and dedusting. A review of the duty is essential to know the type of screen to recommend. When this is established, the capacity chart is then used to determine the size of unit required.
Nordberg-Lokomo supplies different types of screens, each designed for a specific range of duty. Occasionally there is a choice between the types we offer. In these cases when there is doubt, you can rely on Nordberg-Lokomo experience to help you make the selection.
COARSE FRACTION Particles which pass over the screen deck, FINE FRACTION Particles which pass through the screen deck. SEPARATION SIZE/ SPLIT SIZE Particle size at which feed separates into two products (coarse fraction and fine fraction). OVERSIZE Material larger than the hole size. UNDERSIZE Material smaller than the hole size. HALF SIZE Material smaller than half of the hole size. SCREENING CAPACITY (Q)Amount of material passing through the screen deck in tonnes/hour FEEDING CAPACITY Amount of material fed to the screen deck in tonnes/hour EFFICIENCY OF SCREENING (EFFICIENCY OF UNDERSIZE RECOVERY)Amount of material smaller than the hole size in undersize compared to the total amount of material smaller than the hole size in the feed.
The particle distribution of the feed has an essential impact on purity. See three examples in figure 1. In each one of them the efficiency is 90 %, but the undersize proportion of the coarse fraction varies (3.2 %, 9.1 %, 23 %).
Factors effecting the screening can roughly be divided into three groups: characteristics of material (B, C, F, K, L) characteristics of screen (D, E, AF) characteristics of screening element (A, G, H, J)
[t/h] (passing through) A = Nominal capacity [(m/h)/m] (passing through) B = Oversize factor C = Halfsize factor D = Deck location factor E = Wet screening factor F = Material weight [t/m] (bulk density) G = Efficiency factor H = Shape factor for mesh holes J = Factor for proportion of holes in the mesh K = Factor for crushed stone and gravel L = Factor for humidity content AF = Effective screening area [m]
The factors are obtained from diagrams based on relationships observed empirically. Since these factors are known, it is consequently possible to calculate the specific capacity of the screen in tons/h per square meter.
The amount of oversize describes the amount of the particles of the limit size. Particles which are considerably larger than the hole do not make screening difficult. Large stones push stones of limit size through the screening element.
The quantity of the half size is used to inform / present the quantity of the fine material. Material smaller than half the hole size passes through the screening element very easily. If a feed contains a lot of fine material, it can be fed in large quantities onto a screen. If there is little fine material the screening capacity falls. This is due to the fact that there are a lot of particles of limit/critical size. The throughput of particles of limit size (0.5 1.0 x hole) is very poor.
Flaky (thickness is small, relative to the other two dimensions) and elongated (length is larger than other two dimensions) stones are the most difficult to screen. They pass over the screen deck laying on their widest side. At worst they become wedged in holes and thus block the whole screen deck.
When the humidity is under 3 % it has no significant importance. The problems start at 4 5 %. At 9 30 % screening is very difficult. When there is more water the screening gets easier, and it is close to separation of water screening.
Stroke length, rotation speed, stroke angle, and screen inclination form together parameters which affect the operation of the screen. These fundamental factors have to be in proportion to each other. Stroke length and material amplitude have an effect on:
how the holes of the element stay unblocked. If the stroke length is too small also the material amplitude stays too small and the element gets blocked. The problem arises when the hole size is large (50 mm or more).
Acceleration of the screen box can be calculated by the stroke and rotation speed. When stroke angle and inclination are taken into the calculation, the vertical acceleration can be found. Vertical acceleration has an effect on the screening efficiency and the rate of travel.
Acceleration should be 4.5-5.5 x G (G=9.81m/s) with horizontal screens to reach a good screening result. To avoid structural damage for the screening unit, no acceleration greater than 6-7 times G are allowed.
Stroke angle has an effect on the material amplitude and the rate of travel. The most suitable stroke angle for horizontal screens is 55-60 degrees. Too upright a position can reduce the rate of travel. Horizontal stroke angle can improve the rate of travel but reduce screening efficiency. It also increases the wear rate of the mesh.
Speed of travel can be increased by inclining the screening surface. If the surface is greatly inclined, the stroke must be short to prevent material sliding over the mesh too quickly. Inclination of the surface can keep the mesh holes open more easily.
The bed of material may not exceed a height more than 3-5 times the size of the mesh hole on the discharge side of the screening surface. A higher bed of material will reduce the screening efficiency. Feeding capacity for each mesh size depends on the width of the screen. To get efficient screening results the depth of material bed must be at least 2 times the mesh hole diameter on the end side of the surface. Then volume of oversize will determine the width of the screen.
The depth of material bed should be within allowable limits on the beginning and the end of the surface when choosing the screen.Screening area is not theonly dominant parameter while choosing the screen. In practice the length is 2- 3 times the width.
A deck factor should be used when calculating lower decks in muitideck screens. In lower decks the feed drops not only at the beginning of the deck, but also later in the direction of the flow. That is why material close to separation size will not be screened out.
Effective screening area is the area where material can drop down through the surface. Effective surface area is about 0.7-0.9 times the whole area. The whole area is determined by the inside parameters of the screening unit: length times width.
Figure 3. Schematic diagram showing how the screening effect varies along the screen deck. Stratification takes place within zone 1, screening of fine undersize particles (75% of the size of the screen apertures) takes place within zone 2 and screening of critical undersize particles, i.e. particles of a size close to the size of the screen apertures, takes place within zone 3.
The amount of loading influences screening efficiency. In practice it is impossible to reach 100% efficiency. Maximum efficiency is about 95%. In most of the cases 90% is achieved and the screen can be said to be under 100% loading.
The greater the open area of the mesh, the more effective is the throughput. When determining the open area of the mesh, the diameter of the wire between holes in different meshes differs, and has to be taken into consideration.
The type of the mesh will have an effect on screening efficiency. The most significant difference will be in special screening cases. For example while screening elongated material, mesh should be of the vibrating type (rubber or harpmesh)
By scalping it is meant screening of coarse material in order to remove the undersize, typically before a primary crusher. Because of the coarse feed the top deck, which may be the only one, is often of a grizzly type. i.e. grizzly bars as opposed to mesh. This type of screening calls for a robust construction whilst there is no requirement for screening efficiency.
Leaving out the ancient trommel screens, stationary grids, and similar types, the following means are used to make the screen vibrate. All screens today are vibrated by various methods to pass the undersize through the apertures of the screen mesh or grizzly bars.
By freely vibrating screens one means screens that are supported on springs, and the box is vibrated by a vibrating mechanism (also called an exciter) which vibrates the screen box in various ways, depending on the type of vibrating unit.
Screens with a circular motion are the most common type. The vibration is circular because of a single eccentric shaft mechanism. This movement would not move the material forward, unless the screen is inclined in the direction of the material flow. This in turn means that the screening efficiency is not quite as good as a horizontal screen. The capacity as such is often higher as this screen is able to transport the material more quickly. The higher the inclination, the greater the transport ability. Inclination is typically 12 20. The inclination also helps to prevent pegging.
The depth of this material layer is more critical with a circular motion screen than with a horizontal screen. The inclination reduces screening efficiency. This type of screen may be used for almost any application. They are also cheaper to produce.
The vibration of this type screen is created by two eccentric shafts, rotating in opposite directions. This gives the box a linear motion. The stroke angle would depend on the relation of the eccentric weights of the two shafts to each other. Because of the linear stroke the material is moved in the direction of the stroke and the screen may be installed horizontally. That is why they are often called horizontal screens. The inclination would be typically 0 5.
The horizontal screen gives high screening efficiency, and they are often used for final and fine screening. Another advantage over inclined screens is their lower profile and therefore, horizontal screens mean lower structures and buildings, and shorter conveyors.
Elliptical motion can be achieved by various means. One method is by using three eccentric shafts, two of which would create the long axis and the third, the short one. These screens are used in special applications where the aim is to gain advantages of both circular and linear motion screens. It is a compromise however, there would also be a measure of disadvantages. These screens are typically installed at an 0 5 angle.
The eccentric shaft(s) of this screen type are connected both to the screen box and the foundation. The two shaft type would give a circular motion whilst the single shaft type would give this near the vibrating unit, and differ with the loading, depending on the action at each end.
These screens are used mainly for screening coarse material. The screens become heavy, and the dynamic forces which the foundation has to absorb, are a disadvantage. Brute force screens are installed 12 20 inclined.
The vibration of this type of screen is created by the resonance between the under-frame and the screen box or decks, and because of the resonance little energy is needed to vibrate the box. These screens are always installed horizontally.
The advantage of this type is the high efficiency as the screen can be very long, and therefore are mainly used for fine screening. They also have a low profile which can be advantageous. However they have very heavy and expensive structures.
Sizers are generally small and equipped with multi decks to assist screening. The products of two or more decks are often blended in the chute work of the screen. They have very high capacity because of the inclination. The apertures of the meshes need to be considerably larger than the cut, and thus affect the efficiency. This is compensated for by the blending. The advantage of this type is that it can be used for difficult material with less blinding than with other types.
The steep angle at the feed end gives the material a high velocity, some 3 4 m/s. Later the angle levels out and slows down the material to 1 1.5 m/s in the middle and 0.5 0.8 m/s at the discharge end. This is where the screening efficiency is achieved. These screens are generally large and used in high tonnage plants, particularly in mining where fewer fractions are separated.
There are a number of special screens, of which the flip flop is an example. The special narrow rubber mesh strips are installed perpendicularly between two separate frames. The meshes being attached to one frame on one side and to the other at the other side the bulk receives extremely high accelerations. This helps screening of wet, dirty and other difficult materials.
This table is a guide only to the parameters of a horizontal screen. When solving screening problems, take also into account the size parameters of the material, screen cloths and physical screening conditions.