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Home - News - Process knowledge and problems of rubber sealing ring products

Process knowledge and problems of rubber sealing ring products

October 28, 2021

   There are many types and functions of rubber sealing ring products, so the specifications and performance


of the seals are also different, but in the production process, the procedures are basically the same.


SUNCAR Seals tells you what are the basic daily technological processes of rubber sealing ring products


using general solid raw rubber as raw materials? The six basic processes such as plasticizing, mixing,


calendering, extruding, molding, and vulcanizing are of course indispensable for the basic process requirements


of raw material preparation, finished product finishing, inspection and packaging.


1. So, what are the main problems that the processing technology of rubber seals solves?


   For example, in the process of solving the contradiction between plasticity and elastic properties,


through various technical and technological means, the elastic rubber seal ring specification material is


turned into a plastic plastic compound, and then various compounding agents are added to make semi-finished


products, and then through daily vulcanization. Semi-finished products with plasticity become


rubber seal products with high elasticity and good physical and mechanical properties.


2. What is the reason for the defective products in the film pressing process of rubber sealing ring products?


Inaccurate size;


Insufficient amount of rubber;


Too much rubber material, the speed will increase;


There are convex and concave marks on the surface;


There are bubbling on the surface and inside of the sealing ring due to the presence of air;


There are impurities on the surface and inside of the sealing ring;


The phenomenon of curling occurs, and the structure of processing and abrasive tools is unreasonable;


The rubber has obvious inward shrinkage at the parting place;


There are cracks, cracks, and delamination on the surface and inside of the sealing ring.


3. What are the factors that affect the viscosity of rubber sealing ring materials?


The chemical structure of rubber molecules;


The higher the molecular weight, the higher the viscosity;


Molecular weight distribution status;


The influence of temperature on the viscosity of rubber;


The rate effect of the shearing process;


Influence of compressive pressure at processing temperature;


The longer the parking time, the slower the speed;


Compounding agent.


4. What is the reason why the rubber sealing ring products must be


Parked and matured after being cold?


Reduce rubber shrinkage;


Generate bonding rubber to improve the effect;


Continue to spread during the parking process to evenly disperse;


Recover the fatigue of the rubber material and the mechanical stress experienced during mixing.


5. What are the technological characteristics of the rubber sealing ring material?


High flexibility;




Electrical insulation.


Must add compounding agent.


Vulcanization is required, except for thermoplastic elastomers.


6. What are the physical, technological and mechanical properties of rubber seals?


Tensile Strength;


Definite elongation stress.


Tear strength.