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What Is An Extruder Screen?

Aug. 10, 2020

We focus on Single Extruder Screen wholesale. One of our focus is customized filtration products. As you can imagine, "custom filters" is such a broad category.

The problem is that we have manufactured filtration products for many industries, such as oil and gas, food and beverages, pharmaceuticals and medical.

Therefore, although product groups like this allow us to utilize our engineering expertise and silk screen capabilities, even if we cannot imagine all the possibilities. Except for the plastics industry, we don't have much opportunity to talk about standardized products in this product line. One of our most commonly used "custom filters" is the extruder screen. Sometimes these filters are also called screen packs, and they have the same meaning.

The extruder screen is necessary for any polymer or plastic extruder. We will discuss everything about extruder screens in this article, from definition to pricing to how to manufacture.

Extruder Screen

Extruder Screen

What is an extruder screen?

The polymer material needs to be formed into a desired shape. This is true whether it is used to produce bags, bottles, flat-screen TVs, clothing or auto parts.

The material usually starts in pellet form. These small pieces need to undergo some kind of manufacturing operation or need to be squeezed into the desired state.

The material needs to be processed through melting and filtering operations to ensure that the material is clean and pure. This is the location of the melting system with extruded screens.

The extruder screen is a single-layer or multi-layer metal wire filtration system that is welded together and made into a specific shape and size.

The molten material is forced through a wire mesh screen to remove any contaminants before proceeding to the next process.

Depending on the required purification level, pressure requirements or the characteristics of the material being filtered, different layer configurations and micron grades (mesh size) can be used.

These filters are often replaced during the filtration process and usually cannot be cleaned or reused.

How is the extruder screen made?

Extruder screens are manufactured to meet many different specifications. The grid that makes up the screen will be the exact size of the opening in your process, and the size and shape will be determined by your machine.

This is how to make the extruder screen:

-Choose screen specifications with appropriate micron level

-Laminate and connect materials together during spot welding operations

-Use compound tools

Continue the spot welding material for the stamping operation-separate the extruder screen from the skeleton/scrap

-Complete the extruder screen has been cleaned

-Clean the extruder screen has been shrink-wrapped, ready for shipping

Components

One misunderstanding is that since the screen of the extruder is not reusable, it is easy to manufacture, or the "cheaper version" can do it. This is not the case.

The extruder screen is a key part of any polymer or plastic extrusion process.

We are going to introduce some key components of the extruder screen. These components should help you choose the best manufacturer for the process to provide a durable and reliable screen.

Welding

It is important to choose the manufacturer who solders the screen correctly. Although there are extruder screens at different prices around the world, quality is of the utmost importance.

The screens need to be soldered properly to ensure they will not bend, stretch or break. This type of effect can change the size of the opening in the grid and change the filtering result.

This will also result in the need to replace the screen more frequently, which will eventually cost more money.

Wire mesh screen

The mesh in the screen (whether single-layer or multi-layer) needs to be close to the material to be filtered. During this process, you don't want the screen to rust or corrode.

If the processed polymer will corrode mild steel, or the chance of contamination by oxidized steel mesh materials should be avoided, stainless steel is best.

Nickel alloy mesh is used to extrude fluoropolymers that may corrode typical stainless steel.

The size of the opening and the type of weaving are also important to the quality of the screen.

The micron grade/mesh number varies depending on the result you expect.

Square mesh is the most widely used due to its flow ability, but filter weaves (Dutch twill and others) can also be used for finer filtration.

Typical square meshes and related micron grades range from 18 mesh (1000 microns) to 500 mesh (25 microns).

Single or multiple layers

Extruder screen can be made of one or more layers of screen.

When dealing with pure materials with fewer impurities, use a single layer.

Multiple layers can be used when reground or recycled materials are used or when absolute cleaning is necessary.There is usually a rougher protective layer with which the molten polymer first comes into contact.This protects the finer filters from debris, pressure, or the swirling motion of the plastic melt.Another rough bedded baffle supports and protects the finer mesh layers from being pushed into the baffle holes.

The structure varies according to various factors, such as the type of material and cleanliness requirements, but the screen of an extruder usually consists of two to five layers.

The layers can be spot-welded, held together by the rim binder, or simply loosened and stacked to the desired structure.

The shape

The screen of an extruder is usually round or renal.

Circular screens are usually used one at a time, and the filtering process is stopped to replace the screens.

The nephroid mesh can be used around multiple screen wheels and automatically advances to the next screen when blockage or pressure buildup is detected.This type of system allows the process to run uninterrupted, and the operator can replace the blocked screen while the new screen continues the melt flow.

size

The size of each style varies greatly.The circular screen can be less than 1 inch in diameter or more than 16 inches, depending on the type and volume of material required.

Similarly, kidney-shaped screens typically range in size from 2.5 inches x 3 inches to greater than 3.5 inches x 6.5 inches.

How much is the Extruder screen?

The price of the extruder screen you can expect will depend on many factors, including:

Size -

Shape -

The layer number of -

- Quantity purchased

- Cost of each individual grid specification selected

- Any special treatment required

- alloy

How often do I change the filter of the extruder?

Although quality extrusion screens are quality products, they must be used regularly, frequently, replaced and discarded.

How often you need to replace the waste liquid depends on your process, how dirty the melt is or how much impurities need to be removed.

Screens with clean melt may last for days or weeks without replacement/replacement, while dirty recycled materials may require multiple replacement of extruder screens per hour.

Add them up:

No matter what product you want to buy, it's hard to find the right one.It may be more difficult to find the right manufacturer based on your requirements, because it is difficult to tell the true quality just from the pictures.

Whether you decide to buy extruder screens from us or from others, we hope that you will become an educated buyer. We hope that Cylinders Screen suppliers will help you understand why one of these screens works and how you will know what to look for when buying them.

 


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