Extrusion Principle of Rubber Sealing Strips
Time：
2019-03-14
The rubber compound is heated and plasticized within the extruder, subjected to intense shear between the screw and the barrel, and continuously conveyed forward by the screw’s rotation. Under pressure, it is then forced through the extrusion die (also known as the die head) to produce the desired product shape. Characteristics of rubber extrusion molding: 1. The rotational motion of the extruder screw further mixes and plasticizes the compound, yielding semi‑finished extrudates that are dense and uniform in quality; 2. It has a wide range of applications—by changing the die, various cross‑sectional profiles can be produced, as well as pre‑formed semi‑finished products for use in compression molding; 3. Extruded parts are manufactured at high speed, resulting in high production efficiency, with…
The rubber compound is heated and plasticized within the extruder, subjected to intense shear between the screw and the barrel, and continuously conveyed forward by the screw’s rotation. Under pressure, it is then extruded through the die (also known as the die head) to produce the desired product shape.
Characteristics of rubber extrusion molding:
1. The rubber compound undergoes further mixing and plasticization as it is conveyed by the extruder screw, resulting in a semi-finished product with a dense, uniform structure.
2. Wide range of applications: by changing the die, it can extrude rubber profiles of various cross-sectional shapes and produce pre‑formed semi‑finished products for use in compression molding dies.
3. Extrusion‑molded products are produced rapidly, with high manufacturing efficiency, making them well suited for automated production.
4. Extrusion molding is not limited by length, enabling the production of long articles that cannot be manufactured by compression molding due to equipment constraints.
Rubber sealing strip extrusion
When it comes to weatherstripping, we think of its applications in automotive components such as doors, windows, the vehicle body, seats, sunroofs, engine compartments, and trunks, as well as its functions—preventing water ingress, providing a seal, reducing noise, keeping out dust, protecting against freezing, and absorbing vibrations. As a manufacturer of weatherstripping, Zhongnan Rubber & Plastics not only meticulously oversees every step of the process—from mold design and structural fabrication to machining, assembly, trial molding, pilot production, and mass manufacturing—but also places great emphasis on mold design. Because weatherstripping is used in various parts of a vehicle, serving different purposes and performing distinct functions, the molds often have complex structures. Our Tooling and Mold Department engineer, Mr. Ding, has prepared relevant knowledge on rubber extrusion mold structures and design, which we’ll now review briefly.
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Shuangda
Hebei Shuangda Rubber Machinery Co., Ltd.
Tel：400-0319-386
Landline：+86-319-6017632
Email：shuangdaxiangsu@126.com
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Addr：Liyuantun Industrial Zone, Weixian County, Xingtai City, Hebei Province
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