cheap double screw pvc extruder
Using plastic extrusion, raw plastic is melted and formed into continuous profiles. Items made by extrusion include pipe/tubing, weatherstripping, fencing, deck railings, window frames, plastic films and sheets, and thermoplastic coatings. Using a plastic extruder is a high volume process, where a lot of product is created quickly.
Searching for an extruder machine for a plastic extrusion job? You can get a plastic extrusion machine for PVC, ABS, and many different polymers. PlastiWin has a wide variety of used extrusion machines for sale, to help you deliver high quality parts.
Our most popular brands of used extruders and extrusion lines include: American Leistritz Extruder & Twin-screw Extruder, Entek Extruders, Werner & Pfleiderer Extruder & Twin-screw Extruder, Coperion Extruder, Milacron Extruder, and Berstorff Extruder.
It uses one motor But a gear mechanism to make the dual screws are synchronously working, compared with two motors the speed differentiate will make the screws quarrel.
The new design SJ25 twin-screw extruder desktop type is the quite suitable and cost-performance machine for lab or institute use of color masterbatch or pigment mixing and pelletizing, etc., the affordable desktop experiment of plastic modification.
SJ25Twin-GL is a granulating line that includes a twin-screw extruder SJ25, a water tank for cooling for extruded out, and a pelletizer (tractor in one) to cut the extrusion filament into pellets.
An extrusion company asked us for a consultation to assist in purging rigid PVC from extruders, single and twin screw. Their current method used a powder purge that could also be run through the die. They had pretty strict selection criteria. They would only make a change if their new purge: 1.) improved cleaning power and removed contamination, 2.) could be used to seal the machine during shutdowns, and 3.) would avoid contamination at start-up--a very common issue for PVC.
This application for purging rigid PVC carried the standard concerns for the material: avoiding temperature increases to prevent degradation of the PVC, and ensuring that the PVC itself is able to displace the purge to be able to return to production without delays due to residue. The user intelligently set about running tests first on the 3.5 ”single screw extruder, before running the same test on the twin screw extruder. This decision allowed them to observe the behavior of the new purge in the simpler of the two extruders, as a flow and displacement test with the purge and PVC. If satisfactory, they’d then try it on the twin screw extruder, which is larger in barrel capacity and a bit more complex in design.
If you are in the plastic pipe or profile, board or sheet industry, a complete guide into the operations of a twin screw extruder is all that you require. A guide that will ease the way you operate a twin screw extruder and make your operations efficient. Actually, we have two type twin screw extruder, which are conical twin screw extruder and parallel twin screw extruder, in this artile, we will talk about conical twin screw extrder for PVC, if you want to know more about parallel twin screw extruder, please click here. That is what this guide offers you. Not only will you find it easy to utilize this guide but you will learn about the terms of the double screw extruder. And that is not all. You will be able to learn the design as well as the working principle of the twin screw extruder.
But wait, before we proceed, we need to define what a twin screw extruder is. https://youtu.be/7cnZPgEM9Tw A twin screw extruder refers to an equipment found in the plastic making industry. Its purpose is to mix and melt various polymeric materials to come up with a variety of plastic products. A unique characteristic of the twin screw extruder machine is that it has two screws inside the barrel. This helps in mixing the resins properly and ensure maximum heating.
But in our conical double screw extruder machine which is only counter-rotating type. There is a lot that happens during the extrusion process. To understand the details and the flexibility of a twin screw extruder, let’s read along.
What makes you choose a twin screw extruder over the other extruders? What are some of the advantages you will have when using this types of extruder? Also, what are some of the limitations you will have when using this extruder? You will find the explanation to these questions in this sections. This will enlighten you to choose the twin screw extruder for your operations.
A twin screw extruder plays an important role in the manufacture of pipes that we use for safe delivery of water for consumption. Using the latest technology, pipes made from twin screw extruder are leak proof which avoids water contamination.
Agriculture plays an important in our survival. As such, constant irrigation is important. Twin screw extruders manufacture pipes for irrigational purposes. Pipes such as hose pipes and drippers are available due to a twin screw extruder.
Another reason why you need a twin screw extruder is that it helps in the oil industry. The availability of pipes from a twin screw extruder transport various oil products. This helps in avoiding accidents that relate to oil tanker collision which are very disastrous.
Twin screw extruders have different designs of the screw which have a wide interpenetration. This helps in properly mixing the resins. Different types of screws such as the kneading screws and the reverse screws allow for precise shearing of the resins. This allows for extruding materials which are uniform.
A twin screw extruder can handle several processing functions in one extruder. These functions include mixing, melting venting and cooking. This is made possible due to the interdependency of the screw sped.
Twin screw extruder has high productivity which is as a result of its ability to handle a wide range of raw materials. It also handles different mixing recipe at different screw speed.
A twin screw extruder is economical when you analyze its running cost. It utilizes less raw material while the output level is high. Also, the amount of energy consumption is low which ensures that you get the most out of your production. Not forgetting that since it is flexible, you can produce different designs of plastic pipes.
Like every machine, there are some challenges when you are using this machine. However, this cannot hinder you from choosing a twin screw extruder for your production. Let’s have a look at some of these limitations of a twin screw extruder
The initial cost of acquiring the twin screw extruder when you compare to the single screw extruder is relatively high. This makes it unattractive for people to purchase
Regular friction in the barrel means that the screws go through wear and tear. This means that there is a need for constant replacement of the screw. Another area where there are wear and tear is in the compression section, the rib edge and the barrel. This implies that you will have to replace this sections often. Lastly, if you want to get the best out of your twin screw extruder, you will have to pretreat the resins constantly. This ensures that your resins produce the best quality plastic products.
As equipment that you will often use, you need to understand the various parts of a twin screw extruder. Where these part are, and their purpose is very important.
Your twin extruder needs the energy to power up. This energy comes from an electric motor. An electric motor converts electric energy into mechanical energy. It is this mechanical energy that all operations in the twin extruder will utilise. There are different types and models of electric motors that depend on the size of your twin screw extruder.
So in case, your production is relatively small, your twin screw extruder will have a small electric motor. Another thing to note is that the amount of energy that your extruder consumes depends on the size of your motor.
The twin screw extruder has two screws whose function is to propel materials forward. This helps in the distribution of heat to the resins in a uniform manner. There are different types of twin screw that you can use. This includes co-rotating screws in which the screws are rotating in the same direction. We also have the counter rotating screws where the screws are rotating oppositely.
The screws are said to be intermeshing when centerline between the shafts of the screws happens to be less than the screws diameter. If the centerline between the shafts of the screws is the same as the screw diameter, the screws are non-intermeshing. The barrel hosts the screws, and they are responsible for feeding molten resins to the die which builds pressure on the die. You can use co-rotating twin screw extruders in high speed when you want to compound resins with additives. You can also use it when you want to remove solvents. If you are using co-rotating twin screw, you can produce pipes and profiles. On the other hand, you can use counter rotating screws when you want to compound PVC and other resins.
When it comes to Non-intermeshing, counter-rotating screws, you can use them in de-volatilization and chemical reactions. On the other hand, the barrel conduct heat from the heaters underneath it which distributes it distributes to the resins. Different types of barrels exist such asThe vented barrel which has an opening at the top for feeding
The function of the gearbox is to convey energy from the electric motor to the screws. It also regulates the motor speed to align with the speed of the screw. As it does this, it multiplies the torque while multiplying the angular timing of the screw.
The function of the cooling fan is to provide the necessary temperature control that the twin screw extruder needs to operate. There are two types of cooling fans available for the twin screw extruder. There is a cooling fan that uses cooling bores which are throughout the barrel next to the barrel liners.
The vacuum pump
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