How to choose the right screw barrel for your plastic extruder

Choosing the right screw barrel for plastic squeezer machine is an important decision that can save you a lot of money and headaches in the long run. There are several factors to consider when choosing a barrel, including the size of the plastic squeezer, whether it will be used for extrusion, and whether it will be exposed to harsh conditions.Having an understanding of the basic extrusion screw barrel process and the elements that make up the barrel can help with the design of your machine. The extruder screw is the core of the extrusion process and is made up of three parts. These sections impact functional performance, product characteristics, and melting.The overall length of the screw includes the flighted portion, the shank, and the nose cone.

It is typically four to eight diameters long, depending on the type of screw. The overall length of the screw does not include the non-return valve or the non-flighted portion of the screw at the discharge end.The feed section brings plastic pellets into the extruder barrel. This section is usually cylindrical in shape and has a fixed depth. Usually, the length to diameter ratio of the feed section is around 5 to 1.The transition section is a zone where the melted plastic flows from the die and into the barrel. The transition section is usually 5 to 10 diameters long. The transition section is also referred to as the screw inventory or screw inventory channel. The transition section is designed to improve the mixing of the melted polymer. It is also used to strain out contaminants and increase back pressure.Choosing the right steel for your plastic squeezer machine is one of the most important decisions you will make.

The material that you choose will determine the life span of your machine and the quality of the plastic that it produces.There are a lot of high performance tool steels to choose from. But which one has the best balance of strength and toughness? And which has the best edge retention? Here are the pros and cons of each.CPM 10V is a high performance tool steel that delivers good edge retention and wear resistance in one package. It also provides good machinability and toughness with high levels of hardness. It can also stand up to high impact usage. You may have seen it in many applications, including machinery wear parts and slitter knives. This material can also be used as a replacement for many carbide based materials, such as high performance stainless steel.AVK ball check valves are a reliable, economical alternative to piston check valves. They are available in stainless steel AISI 316, ductile iron with epoxy coating and BSP threads in DN32-50. They are also self-cleaning.A ball check valve is a device that prevents backflow of fluids, typically water.

They are commonly used in spray devices, gel dispensers, and liquid dispensers. In some cases, they are also used to prevent backflow of potentially contaminated water. The simplest test for a ball check valve is to pressurize the device. While this test is relatively easy, it may not be applicable to all leakages.The design of a ball check valve begins with the diameter of the through hole. This size is based on the required flow rate. The Reynolds number is also an important consideration. A larger diameter ball will require a greater flow rate, whereas a smaller one will require less.Generally, the extruder screw barrel is designed in three sections. The first section is called the feed section, while the second section is the metering section. The metering section is at the discharge end of the extruder barrel. The second section is welded to the larger diameter of the first section at the taper area.