In general, screw barrels are identified by their screw and barrel sizes.
Extruder twin screw barrels and parallel twin screw barrels are generally distinguished by the outer diameters of screw threads. They are characterised by a screw L/D ratio.
Screw L/D ratio, screw diameter, D, refers to the outside diameter of screw threads. The screw’s effective length, L, is the length of the screw’s working part. The effective length is not the same as the total screw length. A length-to-diameter ratio (L/D) measures the proportion of the effective screw length to the diameter.
Twin screw barrels use the small thread out diameter and the large thread out diameter of a screw to represent the different models. An accurate quote should also include the barrel’s outer diameter.
Regarding the conical twin screw barrel, it has a specific screw barrel size, which can be found on the conical twin screw extruder model.
It is possible to replace the extruder screw barrel. High quality new screw barrels have a longer service life. Plastic extruders processing high-filling plastics or recycling materials require very high-quality screw barrels. If the screw barrel wears out after high filling raw materials, then it needs to be replaced. If the barrel and screw are worn out, the gap between them is bigger than when it is new.
It is obviously different between extruder screw barrel and injection screw barrel from the appearances.
The extruder is to extrude plastic through a fixed shape extruder outlet, which is under the effect of the screw. The screw is cut after water cooling and shaping under the effect of a traction machine, which is mainly used for continuous production of products with the same cross-section, such as pipe, bar, profile, etc. It can also be used for plastic modification granulation.
An injection molding machine is to inject plastic into the mold after cooling is the product. The process is known as the injection molding process.
The structure of the two types of machine screws is different. The extruder screw thread is generally bent and narrow, while an injection molding screw barrel is required for plastic materials to flow in the mold.
HUACHEN SCREW MFG. is a long history screw barrel manufacturer since 1993. The factory is located in Jintang Island, Zhoushan City —- the biggest screw barrel producing base in China. HUACHEN SCREW is also the source supplier for many famous brand machinery and end product brands. HUACHEN SCREW has its own foreign trade department, so worldwide customers can purchase the original high quality screw barrel at the most suitable price directly.
Extruder screw and barrel work together. The extruder barrel contains the screw, the screw rotates in the barrel. When the screw rotates and pushes the plastic material to move forward in the barrel. The heaters are outside the barrel, the heat is transferred to the plastic inside the barrel. When screw thread volume gradually reduces, the plastic in the threaded groove is evenly mixed and plasticized. The action of various forces such as extruders. The screw thread is turning and shearing, and gradually melts into a viscous flow state. At last, it moves to the front of the barrel. Then, completing the plasticization of the plastic. The extruder screw and barrel work together normally to ensure the extruder continuously extrudes raw materials for molding.
You can send your inquiry to us about your original screw and barrel details. And attaching the screw barrel drawings if possible(simple hand drawing is also available). Our sales representative will contact you within 24 hours to assist you regarding your inquiry.
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