Category Archives: Industrial Equipment

Transformer Winding Machines: Significance and Types

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Transformer is one of the most crucial components of any electrical circuit. A transformer is basically used to convert (increase or decrease) the voltage, depending upon the maximum allowable voltage of an application. Thus, there are two main types of transformers, namely, step-up and step-down transformers. The main difference between these two types of transformers is the number of windings. Thus, winding becomes the most important part of this electrical device. These windings are manufactured with the help of transformer winding machines.

 

Transformers are used in a wide range of applications varying from a mobile charger to huge industries. Thus, the rating of the transformers can vary from VA to MVA. VA is the voltage and current rating of a transformer. Thus, based on the applications, transformers with different windings are used. There are different types of transformer winding machines used to manufacture transformers with different VA/MVA ratings. Besides this, different types of winding machines are required, depending upon low volume or high volume production. What are these machines? What is the significance of these machines in manufacturing winding? Are you intrigued to know more about them? Read the following post to get a detailed understanding of these machines.

 

What Are the Types of Transformer Winding Machines?

 

As discussed earlier, transformers with different VA ratings require different coil winding machines. Based on this, there are three main types of winding machines used. These three types of machines are as follows:

 

  1. Manual Transformer Winding Machines –

These transformer coil winding machines can either be operated by hand or with the help of a small motor. Transformer coils can be wound precisely by using the manual transformer winding machines. One of the major advantages of these machines is that they are light weight. This makes them portable and can be carried from one place to another easily.

 

  1. Programmable Transformer Winding Machines –

The programmable transformer coil winding machines are an advanced version of winding machines, which feature a 16 Bit microprocessor for smart operation. These machines also have a stepper motor, which is capable of winding up to 750 RPM. In these machines, various functions of a transformer are set-up and programmed. This is one of the biggest advantages of these machines, as programming these functions provides high level of precision in operation. Thus, coils of transformer can be wound easily. Some striking features of this achiness are:

 

  • They have a built-in production counter, which keeps an eye on the number of transformer coil winding.
  • There are a number of menu items, which can be programmed easily.
  • These winding machines are equipped with a speed control knob. This helps adjust the speed.
  • Another important and beneficial feature of these transformer winding machines is that they have a display.

 

  1. Automatic Transformer Winding Machines –

As their name suggests, the automatic transformer winding machines do their job with no or very less need of human interference. The advantage of using these types of winding machines is that they help reduce the labor costs. Various tasks can be fed to these machines, and they are operated using computerized programs. The multi-spindle feature of these machines help to make the equipment multi-coil winding. Multiple coil windings can be done simultaneously using these types of machines.

 

These were the three basic types of transformer winding machines used by a number of manufacturing firms. If you want to get more information about transformer coil winding machine, try to check out the website of DETZO Co., Ltd. – the company specializes in producing fully automated production line and winding machines. Learn more details please do not hesitate to visit DETZO immediately.

 

 

Article Source: https://www.armaturecoil.com/blog/transformer-winding-machines-their-significance-and-types/

How to Use A Drill Grinder?

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To help you quickly and easily sharpen drill bits, Earth-Chain provides Drill Grinder for customers. Here, I will teach you how to use the drill grinder. Learn how to operate the drill grinder, please check out the steps below:

 

  1. Set Up The Drill To The Collet Holder

Diagram #1 Set Up The Drill to The Collet Holder
Follow up the Steps 1, 2, 3, 4 for set up the drill to the collet holder. (Without tightening) as shown on diagram #1

 

  1. Set Up The Diameter of Drill

Diagram #2 Set Up The Diameter of Drill

  • Turn right the scale annulus to be “0” position.
  • Adjust the scale to meet the diameter of the drill. As shown on diagram #2

 

  1. Set Up The Drill To The Grinding Position

Diagram #3 Set Up The Drill To The Grinding Position
Insert the collet holder with drill and turn right, then tight the drill by collet holder for set up the grinding position. As shown on diagram #3

 

Attn: The scale annulus maybe not exact for the drill diameter, because of used drill or different model of drill anyhow, please always check the center edge of drill must be parallel with the gap of “Collet Holder”. As shown on the right diagram.

 

  1. Grind The Drill Tip

Diagram #4 Grind The Drill Tip

  • Turn on the power of the grinder.
  • Insert the collet holder with drill and push to the grinding wheel slowly, then move left and right repeatedly to sharpen the drill until the grinding sound disappeared.
  • Take out the collet holder with drill and change to the other side to grind again in same way as above mentioned. As shown on diagram #4

 

  1. Center Point Grinding Base Adjusting

Diagram #5 Center Point Grinding Base Adjusting
Adjust the center point grinding base to the suitable position. Turn right for bigger, turn left for smaller. As shown on diagram #5

 

  1. Grind The Center Point of Drill

Diagram #6 Grind The Center Point of Drill

  • Insert the collet holder with drill and push to the grinding wheel slowly, then move left and right repeatedly to grind the center point of drill until the grinding sound disappeared.
  • Take out the collet holder with drill and change to the other side to grind again in same way as above mentioned. As shown on diagram #6

 

Notice:

Please clean the grinding chip often for avoid the chip scrape to the grinding base and keep using life.

 

Earth-Chain drill grinder is guaranteed for one year under normal operating (expendable parts and wheels are exceptions)

 

If you need more information about drill grinders, please do not hesitate to check out Earth-Chain website. And feel free to send inquiries to let them know your requirements.

 

 

Earth-Chain Enterprise Co., Ltd.

No.551, Sec. 1 Gangbu Rd., Wu-Chi, Taichung 43546, Taiwan (R.O.C)

Tel: 886-4-2630-3737

Fax: 886-4-2630-3636

Email: ece@earth-chain.com.tw / www.earth-chain.com.tw

 

Keep Your Screen Changer In the Flow

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The screen changer plays an essential role in generating quality extrudate. Here’s what you need to know to keep it functioning properly.

 

There are many different designs of screen changers on the market today, from manual slide plates to constant-pressure and continuous backflush or scrapper designs, and each one comes with its own set of strengths and weaknesses. As a processor, you need to know these in order to make the best choice of screen changer for your particular application.

 

This article will focus more on general process troubleshooting as opposed to machine-specific issues, but it’s important to note that a large percentage of problems that extrusion processors have with their screen changers occur because the screen changer they’re using is not the best design for their application. Each specific extrusion filtration application should be closely examined prior to specifying a screen changer for the project.

 

FILTRATION MESH

Every processor wants the best filtration they can get for the area of filtration they have. Very few, however, utilize a screen-pack configuration fully optimized for their process. Take as an example a situation in which an operator is attempting to extend a production run between screen changes. As the screen becomes occluded, head pressure rises and eventually causes the wire cloth to fail. A simple operator solution is to pile on additional 20-mesh screens for increased strength.

 

A better solution would be to increase the support strength of the base screen, using a heavier-gauge 10-mesh screen layered with a single 20-mesh screen. The 10- and 20- mesh screens will support each other by working at two levels. The end result is the ability to run longer between changes, but without the unnecessarily high pressure drop and resulting increase in shear heat. Any increase in pressure-induced shear is best avoided, since this will generate higher melt temperature at the discharge end of the extruder, creating a higher demand on downstream cooling capacity and potentially reducing output.

 

Most screen-changer suppliers offer process-support services that include pressure-drop calculations. These are simple to perform and factor in material viscosities, breaker-plate open area, and screen open area to arrive at the best screen-pack configuration for the process and operating environment. This service is normally a free and simple means to optimize polymer flow performance.

 

TEMPERATURE CONTROL

Another issue occasionally attributed to screen changers is temperature fluctuation. Best practice is to stay alert to gauges, heaters, and heater circuits. Monitoring these on the screen changer may not be as critical as checking the extruder and feed screw, but it can help spot an issue before it becomes catastrophic.

 

Another tip is to optimize the number of heat zones necessary to balance temperature across the screen changer. More specifically:

 

  • Hydraulic slide-plate screen changers are best served by three zones—a body zone and independent zones for the each end of the slide plate. Many processors wire these machines into a single control zone, resulting in too much or too little heat to the slide plate. This can destabilize the melt profile and cause material burning in the off-line breaker plate.

 

  • Continuous bolt-type screen changers are normally best served by a single control zone, but as these machines increase in size, additional body zones help balance the heat. Bolt-type continuous screen changers heat the bolts by conduction from the body. If heat is unbalanced, the body can shrink onto the bolt and generate high enough clamping forces to prevent movement of the bolt.

 

  • Machine adapters are also normally best served with independent heat control. This, however, will vary with size.

 

PRESSURE FLUCTUATION

Streamlining the polymer flow through the screen changer will also affect process stability. For sensitive materials or those with unique flow characteristics, CFD (computational fluid dynamics) modeling software can be utilized to optimize screen-changer flow passages and minimize material residence time. Along this line, adapter length, steps and transitions, and polymer inventory between the screw tip and screen pack can be critical to establishing best flow while minimizing polymer degradation points and thermal stratification.

 

Vent cycles on continuous screen changers can influence pressure stability. Most bolt-type screen changers can see up to 50% of the available filter area removed from the process for screen change. While this naturally causes a rise in head pressure, the flow rate and die pressure normally remain relatively stable. The issue arises with the reintroduction of the clean screen. Vents machined into the bolts divert a small portion of the polymer melt to prefill and purge air from the incoming screen pocket. The resulting slight drop in die pressure can be minimized by operator finesse or more precisely by PLC control. Constant-pressure screen changers, such as rotary wheel designs, are not normally subject to these issues. One auxiliary that can help tremendously with fluctuating pressure is a gear pump, which can tolerate upstream pressure swings while holding the die pressure stable.

 

LEAKAGE

Leakage is a problem with almost all screen changer designs as they age, but most noticeably with slide-plate models. This type of screen changer relies on manually adjusted or pressure-activated seals and is subject to wear and tear from the movement of the slide plate, degradation of the seal-pressure ring, and damage from dislodged screens. Seal maintenance for these machines can be required as often as weekly to once a year. Maintenance can lead to tear down and reassembly, which can be a time-consuming, expensive process. Even before it reaches this point, the housekeeping required keeping the slide plate clean and preventing polymer from leaking onto wiring and other equipment is significant.

 

One way to minimize leakage on a system like this is to increase the head pressure. Your intuition might tell you lower pressure would be better because it would put less strain on the system. However, because the seals are designed to respond to pressure in the extruder, they are only working at their peak when the pressure is higher. At a lower pressure, the seals will relax slightly. When the extruder is idle or running at drool speed and there is very little pressure being exerted on the seal, it becomes easy for lower viscosity material to leak out. One newer slide-plate seal, an all-steel, segmented pressure-ring design, addresses these problems and caries a lifetime leak-free warranty regardless of temperature and low viscosity, making this seal the first to operate leak-free on high-temperature coating applications.

 

Material leakage on bolt-type or other close-tolerance rotary wheel machines that operate without a mechanical seal can likewise occur over time; but with these designs, leakage is almost always caused by mechanical damage. These precision-machined screen changers are typically designed for a fairly narrow material viscosity range.

 

As such, you should not apply a machine designed with clearances for high pressure and high viscosity to a low-viscosity process without approval or modification from the supplier.

 

RESIN CONTAMINATION, DEGRADATION

The primary purpose of a screen changer is to filter out contaminants from the melt stream; but the fact is, screen changes almost inevitably introduce contaminants, some of which get into the die. These result from imperfect cleaning of the slide plate, bolt, or wheel. For example:

 

  • This can occur on a slide-plate screen changer as the upstream and downstream seals scrape material residue into both sides of the oncoming screen pocket. Upstream contaminants are caught on the screen. Downstream contaminants flush out into the die.

 

  • A continuous or constant-pressure screen changer can experience this as well, but to a much smaller degree. The gap between the bolt or wheel and housing is measured in microns on the downstream side. The rare contaminant that makes it through this clearance to enter the melt flow is only consequential to the most demanding of applications, and for these few occasions, secondary, long-life canister filters will catch anything that comes through.

 

Many processes do not have to run continuously or require 100% quality and can overlook contaminants during screen change. However, if your customer has zero tolerance, you’ll need a different kind of screen changer. There is no way to continue using a slide-plate screen changer without introducing some level of contaminants or material degradation from the offline breaker plate. To solve this, a continuous bolt-type or rotary-wheel screen changer is a better solution.

 

LOCK-UP

Continuous screen changers that use no mechanical seal utilize precisely machined clearances to affect a polymer seal. These same clearances provide lubrication between the bolts or wheel and housing and must be maintained to avoid locking up the machines. Lock-up (jammed bolt or wheel) can be a result of various things, usually preventable with correct operator usage. The leading cause of lock-ups occurs when the bolts or wheel are not cleaned and lubricated regularly.

 

Many processors with a bolt-type or rotary-wheel screen changer have bought these continuous-process machines because they have no mechanical seals and run reliably and leak-free for years on end. While these advanced designs certainly require less upkeep than a slide plate, maintenance during screen change should not be neglected.

 

Over time, excess buildup of polymer can plate onto the bolt or wheel surfaces, reducing required clearances and eventually requiring more hydraulic pressure to shift than is available from the power unit or mechanical drive.

 

This stuck bolt or wheel is easily preventable with regular cleaning. A lock-up requires a shutdown and reheat process that can take up to 8 hr or more. Doing daily maintenance and cleaning of the piston takes 5 to 10 min and can save a considerable amount of downtime. “The biggest issue is getting into the mindset of cleaning the whole bolt,” says Marty Danco of Verity Resins, a recycler and compounder based in Forest City, N.C. “When you lock it up, there’s no way home, it’s locked up for good. Using proper copper gauze, the bolt should be cleaned every day—not just the top, but underneath it and on the sides.”

 

The necessity of regular maintenance also holds for breaker plates. Over time, material will carbonize on them, closing off the holes, which raises head pressure and eventually compromises output. Breaker-plate clogging is also easily preventable. The best solution is to make sure to have a clean spare. Swapping these breaker plates out even once a week is great preventive maintenance to ensure it never reaches the point where the process or the final product is impacted.

 

Most leading screen-changer suppliers are excellent resources to refer your troubleshooting issues to. Doing so, instead of relying solely on your maintenance crew, can often reduce your downtime and repair expenses, eliminate some problems before they occur, and potentially point you to a better process solution than the machine currently in service.

 

If you need more information about plastic extruder screen changer, please do not hesitate to check out the website of Hsin-Long Thread Rolling Machine Co., Ltd. – the company provides kinds of blown film extrusion machines, die head, air ring, bubble cage, etc. Learn further details, please feel free to send inquiry to Hsin Long.

 

Article Source: Plastics Technology

How to Increase the Process Speed of Die Sinking EDM

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Developments in the EDM process and its technology along with improvements in accuracy, automation and micro-mold making technology can pay enormous dividends to the domestic mold making industry.

 

Speed Is Not the Solution

Increasing drive speed is one solution to improving the speed of die sinking EDM. In this way the unproductive times for lifting movements are reduced; however, the gain in speed is limited to small electrodes and very deep cavities. In addition, above a certain speed the electrode wear is considerable and very high axis speeds result in extreme strain on the mechanism, make the machine more expensive and shorten its working life. Therefore, it is wrong to believe that a general increase in the process speed is only to be achieved by rapid lifting movements. The contribution of fast axes to the machining process is just one supplementary aspect to a complex interaction that encompasses the generator, process control, gap width regulation and the mechanism. And die sinking EDM requires intelligent flushing.

 

Potential Lies in the Flushing

You can imagine the EDM process as being a balance between the EDMed and evacuated material in the gap. If this balance is not present, then either you flush the machining area unnecessarily—involving a loss of time and additional instability of the process—or you EDM the same particles several times, which cannot be removed from the gap sufficiently.

 

Die Sinking EDM

Before the material can be evacuated from the gap you must remove it from the workpiece. So how can you achieve more removal? As in the case of all optimization problems, the greatest gain potential lies where the efficiency is smallest. The efficiency of a single discharge with a cathodic poled workpiece is theoretically about 25 percent.1 In addition there are some factors that make the efficiency even worse (e.g., process control problems, non-ideal flushing conditions, small gap width), so that realistically you must reckon with an efficiency of less than 10 percent.

 

Removal and Surface Quality Determine the Time Requirement

In the case of EDM, the objective is always to optimize the removal performance of the machining on one hand, and to achieve the surface quality of the workpiece to be machined on the other hand. The workpiece, when machined, is intended to display a certain final roughness and a certain form precision. In addition, two conditions are called for:

 

  1. As small a thermally influenced area of the workpiece surface as possible
  2. As low an electrode wear as possible.

 

These marginal conditions determine the machining time and costs for workpiece production. In practice, a sequence of technological parameters is used because starting out from the roughing to finishing settings, the pulse energy is gradually reduced until the required technological results are achieved. Once again the law of nature applies: you can quickly achieve results of modest quality, but only slowly results in high quality.

 

Physical Processes Show a Solution

The approach toward an ideal state means moving the characteristic curve in the direction of the arrow. That means faster EDM with the same gap width, roughness and wear. If, up to now, the discharge energy of the EDM pulses was increased, regrettably you also only had greater roughness and a greater gap width so that the gains in speed during roughing were lost again through longer finishing. You will find a way to a solution if you return to the basics of EDM theory—to the physical processes leading to the formation of the spark and metal removal.

 

During the discharge, you can identify three main physical phases in succession:

 

  1. The Build-Up
  2. Discharge
  3. Fade Phases

 

In the first phase the discharge canal is built up. After passing through the working medium, the current flows almost exclusively on the surface area of the discharge canal and the anode is partially evaporated by the electron bombardment. The electrode wear mainly takes place here. Every pulse—whether contributing intensively to removal or not— causes microscopic wear. In the discharge phase, the electrical energy supplied causes melting or evaporation of material mainly on the workpiece. The fade phase begins with the switching off of the power supply. The plasma canal collapses and the partially evaporated, partially liquid material is ejected.

 

When to Interrupt Pulses

During the discharge, a crater forms in the workpiece. Fundamental studies of discharges have shown that the growth of the crater in the workpiece stagnates from a certain time. This is because a balance forms between the energy supplied and the energy lost, as well as energy that is used for the maintenance of the plasma and the heat loss to the workpiece and dielectric. This asymptote of the crater growth can be recorded in real time from the spark voltage and current.

 

However, why is the asymptote of the crater growth so important? Because this is the right moment to interrupt the pulse. It is unnecessary to let a pulse last longer if the target radius of the crater and the required roughness have been achieved. You can begin with the next pulse immediately. The time required by the pulse to reach this state also is not constant, as the speed with which a discharge reaches a certain spark base diameter depends on the macroscopic situation in the gap and the local geometry in the spark discharge area. With this first measure alone, you will optimize the number of discharges per unit of time and increase the removal rate.

 

When to Increase the Current

If you now observe the charge’s fade phase you will see that the removal from the workpiece is caused by the collapse of the plasma canal. The sudden drop in pressure—triggered by switching off the power—causes the evaporation and ejection of superheated material. The plasma canal has a very high temperature and pressure. The gradient of its collapse influences material removal. The more abruptly the energy disappears, the better the crater material will be ejected. In order to enhance this effect, a special trick is employed: before the pulse is interrupted, the current is increased briefly. The idea of increasing the pulse current is not new, the innovation is the definition of the point in time when this increase is to take place. The increase in the pulse current has no consequences for the roughness, wear or gap width, but does increase the removal. In addition, as the removal per pulse is greater, you need fewer pulses for the machining, and therefore the wear sinks.

 

Removal Rate Doubles in Part

This new machining strategy (asymptote detection, current increase and pulse interrupt) is the subject of a patent application for its use in new EDM die sinking systems. The results are in accordance with the theoretical reflections, especially where good flushing is guaranteed (e.g., pre-machined workpieces). For these machining jobs removal rates have doubled.

 

Generator Brings Striking Improvements in Performance

The innovative generator offers an increase in productivity of approximately 30 percent; however, up to 100 percent with pre-milled molds that occur increasingly nowadays through synergies with HSM. This refers to all roughing and finishing using copper and graphite electrodes. The advantages are particularly great with good flushing conditions and pre-milled workpieces. These convincing results explain that it is possible to increase the speed and productivity of die sinking EDM, and the potential for improving this technology is still considerable.

 

If you need more information about die sinking EDM, please try to visit the website of Excetek Technologies Co., Ltd. – the company is the well-known brand for its EDM machines. Get more details about Excetek, welcome to check out their product pages and feel free to send inquiry to them.

 

Article Source: MoldMaking Technology

Get Some Information About Bubble Cage Before Buying…

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Why Do You Need Bubble Cages?

Blown film extrusion is the process that involves extruding a tube of molten polymer through a Blown Film Die (Single or Multi-Layer), which is a vertical cylinder with a circular opening. Air is injected through a hole in the center of the die creating a bubble, several times its initial diameter. The bubble is pulled upwards and an Air Ring blows air onto the film to cool.

 

Bubble cages reduce the turbulence caused by the cooling air stream when it hits the bubble. The Bubble Cage reduces movement that the bubble would otherwise have and prevents the bubble from losing stability. More stability results in increased production as well as improved quality.

 

Recommend Bubble Cages Supplier

If you have any interest in Bubble Cage, I recommend that you can visit the website of Hsin Long Thread Rolling Machine Co., Ltd.

 

Hsin Long Bubble Cage

Hsin Long Bubble Cage

 

  • The wires of stabilizing ring with SUS304 for increased.
  • Easy to adjust.
  • Single or double layer assemble easily.
  • Mass production, competitive prices.
  • Choice of various ring diameters.

 

Learn further details about bubble cage or other blown film extrusion machine, please do not hesitate to check out Hsin Long product pages and send inquiry to them.

 

 

Article Source: Mark One Machinery

Benefits of Having a Precision Lathe

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For complex parts and components, you will always need professional precision CNC machining services. However, for prototypes, simple parts, and short runs, there are also benefits of owning a high precision lathe. Although the machine is automated, it gets its instructions from a human who enters written code. Therefore, to own a machine, you also need an operator qualified to provide it with instructions.

 

CNC machine programming may not be rocket science, but it does require knowledge and skill. However, being in control is the greatest benefit of owning a machine. You have the opportunity to produce what you need whenever you need it. Whether creating a protocol or processing a large run, you have full control. Just remember that there is a financial investment in buying a CNC machine. With many different types of the CNC machine, you can always purchase the one that you would use most and then hire a manufacturer for the other work.

 

Types of CNC Machines

 

Following are the five types of machines most commonly used, although there are others. As you can see, each machine offers distinct benefits.

 

  • Router – A CNC router works by engraving plastic, wood, or metal. Following the entered code, a router can perform simple and detailed engraving tasks.
  • CNC Laser – One of the more advanced types of machine, the CNC laser is similar to a cutter with the exception that it cuts wood and metal. In some instances, this machine also cuts plastic. Regardless of the material, the finished product is perfect.
  • CNC Milling – Widely used, the CNC milling machine moves cutters as well as other tools for cutting metal pieces into specified shapes and sizes. Based on the number of axes that a milling machine has, it falls under several classifications.
  • CNC Lathe Machines – These machines are extremely accurate, but also precise, easy to operate, and capable of producing repeatable parts and components. With CNC lathe machines, you can make 3D molds and shapes out of wood, plastic, and metal.
  • CNC Plasma Cutters – While similar to a CNC router, a plasma cutter setup is not as challenging. With this machine, you can produce 2D molds and shapes out of metal.

 

Seeking Professional Assistance

 

There is nothing wrong with owning your own CNC machine and being in control of production. However, when you need outside help, you can try to send inquiry or contact with SHUN CHUAN Machinery. They are the professional and reliable manufacturer of CNC lathe machines. Get more information about precision lathe and other CNC machines, please do not hesitate to check out Shun Chuan website: www.sunmaster-cnc.com and contact them immediately.

 

Article Source: https://www.nexgenmachine.com/benefits-of-having-a-precision-cnc-machine/

Plastic Extrusion: Advantages and Disadvantages of Plastic Extrusion

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Plastic Extrusion

Plastic extrusion is the process where plastic materials are converted from solid to liquid and then it is reconstituted into finished products. In other words, plastic is melted down and then reshaped into useful items. There are some advantages to plastic extrusion, but there are also a few disadvantages that must be considered.

 

Advantages of Plastic Extrusion

3 of the major advantages of plastic extrusion are as follows.

 

  • Low Cost: Compared to other molding processes, plastic extrusion molding has a low cost and is more efficient. The extrusion molding process uses thermoplastics and they undergo repeatedly melting and hardening, this allows the waste to be reused rather than be discarded. Raw material and disposal costs are lowered. Plastic extrusion machines operate continually and this reduces the chances of inventory shortage. It also allows for 24-hour manufacturing.

 

  • Better Flexibility: Extrusion molding will provide considerable flexibility in the products being manufactured with a consistent cross section. As long as the cross section stays the same, the extrusion molding can produce complex shapes. Minor alteration to the plastic extrusion process the manufacturers can use it for plastic sheets or produce products that mix plastic attributes.

 

  • After Extrusion Alterations: Plastics remain hot when they are removed from the extruder and this allows for post-extrusion manipulations. Many manufacturers will take advantages of this and use a variety of roller, shoes and dies to change the shape of the plastic as needed.

 

Disadvantages of Plastic Extrusion

Plastic extrusion has also some disadvantages.

 

  • Expansion: Once the hot plastic is removed from the extruder it will many times expand. This is called die swell. It is problematic to try and predict the exact degree of expansion. Because it is hard to predict the exact expansion, manufacturers often accept significant levels of deviation from the dimensions of the product.

 

  • Product Limitations: Extrusion plastic molding does place limits of the types of products that can be manufactured. There are alternatives that require an investment in a different type of extrusion equipment.

 

If you have any interest in plastic extrusion machinery, I recommend that you can visit the website of Leader Extrusion Machinery Company Ltd. They have more than 20 years’ experience designing and manufacturing plastic extrusion machinery. And the company specialty is manufacture of PP, PS, PVC, PC sheet extrusion lines; and PP, PC PET hollow profile sheet extrusion lines.

 

Learn more information about plastic extrusion machines, welcome to send inquiry to Leader Extrusion Machinery Company.

 

 

Article Source: http://civilengineersforum.com/plastic-extrusion-advantages-disadvantages/

The Stages and Machines Involved in Producing EPS Foam Blocks

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Expanded Polystyrene foam, also known as EPS is a highly durable material that is used in a wide variety of consumer products. It can be found nearly everywhere, in your local food store (plates, cups, food containers etc.) and the local electronics stores (insulation for refrigerators, coolers etc.), plastic utensils are made of Styrene, CD cases and cloth hangers are all made of Styrene. It is also an excellent insulation material.

 

EPS foam starts at very small beads, also known as granules, similar to sand in texture.

 

In order to make an EPS foam block out of these raw small beads, they need to be “blown” into larger beads, about 50 times its original size. This is called the pre-expansion process. Depending on the density required, the beads are blown using steam in a machine called expander or steamer. The expander can be a simple manual machine that a worker places the raw material in, then turns on the steam. Or, it can be an automatic machine where the material is blown stems automatically. At this stage, the beads – up to 50 times their original size – are called pellets and are ready to be molded.

 

Continuous pre-expanders are operated without pressure and are equipped with an open- top agitator tank in which raw material is continuously fed from the bottom by an adjustable screw conveyor. Steam is also fed continuously into the pre-expanding room through openings that are positioned shortly above the tank.

 

No matter which pre-expander is used, they all trickle the expanded beads into a so-called fluid bed dryer, where they are dried and stabilized before they are transported into the storage silos.

 

The next step is to mold the expanded beads. There are 2 options for molding. One is using an EPS shape moulding machine, which molds the foam into precise shape and size required. The other is using an EPS block molding machine which will result in creating foam blocks or sheets, 3′ x 2′ x 8′ up to 5′ x 5′ x 24′. The EPS expanded beads are poured into the molding machine for a second heating with steams. This will result in the foam beads being swelled and pressed against each other, until they become one solid piece of foam

 

The two most common blowing agents used are pentane and carbon dioxide. This process called polymerization fills the polystyrene with millions of air pockets, which helps it to expand and also gives it a low thermal conductivity. During expansion, the product can be molded into a variety of shapes and sizes. The final product is 90% air, but amazingly, EPS can have a compressed strength up to 40 psi.

 

In the last step, the EPS foam is removed from the molding machine and cooled down. If you used the shape molder and created a smaller EPS shape, then the cooling time will be shorter than when creating a whole foam block. The larger the foam – the longer it takes for it to cool. The molded EPS should be kept at room temperature (about 70F)

 

Tai Shyan Machinery Industrial Co., Ltd. was established in 1978. They specialized in whole machinery equipment and designs for EPS, EPP fully automatic molding machinery and essential accessories for machines. As a professional EPS / EPP automation solution provider, Tai Shyan is just there for you.

 

 

Article Source: http://EzineArticles.com/8170518

Application of Cold Roll Forming Machine

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Do You Know What A Cold Roll Forming Machine Is?

Cold Roll Forming Machine is a kind of machinery which uses the cold roll forming technology to roll forming the sheet, strip and sheet metal and so on. It makes the metal panel to form a special section bar, so the use of roll forming machine is very wide.

 

Cold-formed steel products which is produced by cold roll forming machine, is a kind of structural member is more important. It is widely used in construction, automotive, electronics and shipbuilding, machinery and other industries. In some areas, it is so popular as it can replace steel, play the effect of saving energy and resources, it is developing more and more rapidly, technology is being improved.

 

The cold roll forming machine have many types, like the gutter roll forming machine, door frame roll forming machine, downspout roll forming machine, garage door roll forming machine, solar photovoltaic support roll forming machine, heavy truck fender roll forming machine, rack column roll forming machine, cable bridge roll forming machine, carriage board roll forming machine, and so on.

 

Well, Where to Find The Reliable Cold Roll Forming Machine Manufacturer?

 

I think Yunsing Industrial that would be your best choice! Yunsing has accumulated more than 40 years of experience specializing in manufacturing steel plate automatic cold roll forming machines with advanced technologies and superior quality products, such as roofing and wall cladding, corrugated sheets, stepped tile roofing, floor decking, C-Purlin, rolling shutters and door frames.

 

If you need more information about cold roll forming machine series, please do not hesitate to visit Yunsing. They will supply you the best quality roll forming machines and services.

 

 

Article Source: https://www.linkedin.com/pulse/application-cold-roll-forming-machine-lolita-wang

Electric Chain Hoists – Choose The Right One For Your Industry

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Electric chain hoists are used in industry and related areas to lift heavy objects, equipment, or machinery. By using electric chain hoists, the task is done faster and easily with less risk involved. They are much easier and sophisticated to use than manual chain hoists. Moreover, they are more convenient and can achieve the task more efficiently than manual chain-hoists. Electric chain hoists are available in a variety of sizes and for a variety of lifting equipment depending upon the load to be lifted.

 

These days, it is not hard for one to find the hoists that you require for your type of industry. These hoists are now manufactured by reputed manufacturers in Taiwan as well as abroad. Many online dealers also stock reputed brands, so you need to know the exact specifications that you require for lifting the required loads.

 

Nowadays, hoists have a variety of features and come with a range of price tags. Depending upon the type of the hoist you require, it is essential you are away of the safety parameters and whether the hoist will stand up to the rigorous operational requirements. Therefore, you should be knowledgeable about the operations requirements of the hoist you propose you wish to purchase. At the same time, you should be aware of the quality standards that are applicable to electric chain hoists. Do not go for a cheaper hoist if you are in a position to purchase a more expensive one. A cheap hoist may leave out the safety and quality parameters essential under various rules, laws, and regulations.

 

A manual chain can lift up a lighter load, but an electric chain hoist can be used to lift heavier loads. Nevertheless, they should not be used for lifting loads beyond their lifting capacity. Therefore, it is always advisable to check the rated capacity of the electric chain hoist before actually buying it. At times, there are circumstances which require continuous operation of the hoist, so be sure that the operators do not exceed the rated capacity. For example, if the rated capacity is 30 minutes on and 30 minutes off, you cannot run the hoist more than this capacity.

 

A torque limiting device on the hoist will prevent accidental or intentional overload. Also check for safety features like upper and lower limit switches and low voltage controls. A stop button can take care of emergency situations. A variety of speed capacities are available so you can make the right choice while purchasing a hoist. There will be a number of manufacturers providing you with the same types or hoists.

 

They are also available in different speed capacities and speeds to be able to endure a variety of handling procedures. Since there are many manufacturers offering various types of hoists, you need to know exactly what you are going to buy. Therefore, while buying an electric chain hoist, do not buy the ones that seem cheap or spurious for you, or do not even buy the ones that violate safety norms. Train your staff adequately on the use of electric chain hoists and always read the operation manual before installation and operation.

 

For quality electric chain hoists for use in various industries, try to visit Cheng Day: www.chengday.com

 

With 44-year experience of electric chain hoist manufacturing in Taiwan, Cheng Day exactly realizes what customers need and offers custom-made design. They consistently improve and upgrades products quality. Moreover, Cheng Day has patents for parts in electric chain hoists; they also create new models every year to extend usage.

 

Cheng Day electric chain hoists are proudly manufactured in Taiwan. More details, please feel free to contact Cheng Day Machinery Works Co., Ltd.

 

 

Article Source: http://EzineArticles.com/5110086