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What is a sealing strip extruder? Precautions for sealing strip extrusion.

Time：

2021-12-10

What is an extruder for sealing strips? Commonly used design software for mold development includes AutoCAD, Pro/E, UG, CATIA, and SolidWorks. Since extruded sealing strip products are not limited by length, and because sealing strips come in various types—ranging from single‑material rubber seals (pure rubber seals) to composite rubber seals (composite seals with metal reinforcing skeletons).

Commonly used mold‑design software includes AutoCAD, Pro/E, UG, CATIA, and SolidWorks. Extruded sealing strips are not limited by length, and their varieties encompass both single‑material rubber seals—pure rubber seals—and composite rubber seals that incorporate metal support skeletons. Moreover, during installation and service, sealing strips exhibit highly complex mechanical behaviors, such as material nonlinearity, geometric nonlinearity, and nonlinear boundary conditions. Consequently, the forming process for sealing strips is extremely precise and intricate; when designing molds, it is essential to account for the shrinkage rates of different rubber materials, as well as product layout and internal structure.

Precautions in the Design of Extrusion Dies for Sealing Strips:

For any extrusion die, the key to its design lies in meeting the combined requirements for the cross-sectional dimensions and shape of the extruded product. Accordingly, the design of a single‑component rubber extrusion die should take into account the following six influencing factors:

(1) Any rubber material exhibits varying degrees of swell when extruded through a die. As the hardness of the rubber material increases, the swell ratio in the extrusion section decreases.

(2) As the extruder temperature of the sealing strip increases from low to high, the expansion ratio in the extrusion section increases from small to large.

(3) As the extrusion speed increases from low to high, the cross-section of the extruded product changes only from small to large.

(4) Extruded products exhibit varying degrees of swell depending on the type of rubber or the rubber content of the compound.

(5) In any extruded product, the expansion ratio of each section in the cross‑section is suboptimal, particularly for non‑uniform cross‑sections.

(6) Different extrusion die designs can have varying effects on the cross-sectional shape and dimensions of the extruded product.

What is a sealing strip extruder? What are the key considerations in designing sealing‑strip extrusion dies? The design of composite rubber extrusion dies shares the common characteristics of single‑material rubber extrusion dies, while also imposing the following specific requirements.

(1) It is necessary to ensure that the extrusion rates of different types of rubber (and reinforcing materials) are consistent, so that these materials can be effectively compounded into a unified whole.

(2) For composite extrusion dies with a skeleton (metal or metal‑wire braiding), it is necessary to verify whether the locking mechanism that secures the composite interface between the die entry and the extrusion die, as well as the locking design for adjusting the composite gap, are appropriately engineered.

(3) In composite extrusion dies, the matching inclination angle between the skeleton‑introduction die and the cavity of the composite extrusion die must be appropriate.

What is a sealing strip extruder? The design of an extrusion die for rubber sealing strips is a systematic process. Every new product must begin with mold design. The quality of the mold directly affects the precision of the final product, so no detail in the design can be overlooked.