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structural aspects of sealing profiles

by:DMS Seals     2019-11-07
The main part of the typical seal profile performance comes from a proper understanding of the structural factors that support and control the rubber profile selected by any specification, and these structural factors must be correctly identified to ensure that in the long run, the installation was satisfactory.
We will discuss here more important aspects to consider when designing complex steel insert extruded rubber profiles, especially in the following applications :-
Edge Protection Profile with and without metal carriers, Seal Profile-
Sponge rubber profiles with and without adhesive (
Self/Acrylic foam)-
Rubber glazed and filled profiles
Rubber profile with double hardness-
Door Seal Profile-Custom-
Manufactured products, frame, ring, length, Ding, plasticine, flock coating, slotting, bonding, sliding coating, etc.
Typical applications include electrical/electronic cabinets, automotive, Windows/construction, oil and gas industries, and general-purpose products for general industries.
These devices primarily involve the removal of air, dust, gas and/or water from the lid, door, or panel, usually including a standard profile --
Probably in a custom solution.
Your supplier should be able to advise on this, especially if a custom design is required to guide --
The following is intended to inform the process.
At the basic level, industrial standard manufacturing tolerances are covered by international standard din iso 3302, custom length tolerances based on din iso 3302-1.
With this in mind, the designer should determine the correct degree of compression (
For air bubble sealing profiles).
The compression volume of the typical seal edge protection profile should be up to 50%, otherwise it will adversely affect compression and recovery.
Suggested profile should be compressed 30-40%.
If there are two cavities in the profile, the value should be applied to each cavity.
For sponge rubber profiles, comparable parameters are compression sets, as one of the essential elements of sealing strip application is lasting deformation.
The most common feature is the compressed set (DVR)ASTM D395.
To determine this value, compress the cylindrical test body-
25%, then stored as pre-
Set the time at a specific temperature.
30 minutes after release, measure the height again at room temperature and determine the lasting deformation from the results.
The DVR of 0 will mean that the test body reaches its original height again (
Unlikely in reality)
, The 100% DVR shows that the test body is not restored and will remain completely deformed.
Why is the compression set such an important parameter?
When the flange gasket is compressed to the specified thickness (
For example, in the door seal)
It applies pressure to the surface of the flange, but after a while, the pressure is reduced due to the rubber deformation and deformation.
If the DVR is too high, the elastic performance and sealing effect will be reduced, and the sealing may stop working properly.
The bottom of the rubber seal itself is usually a steel bar or wire carrier, and the mechanical support rubber is usually selected and the means of installation is provided.
By using a steel or wire carrier, the edge protection part is well grasped without the use of adhesive or adhesive tape-
However, the use of the steel carrier will also have a higher clamping effect than the line carrier, so it is recommended to have a high
Vibration application.
In the limited bending radius, the disadvantage of having the profile of the unbroken steel carrier strip can be seen.
This can be solved by breaking the gate of the connection.
If so, however, uneven surfaces may appear.
Aesthetics is often considered irrelevant in most technical applications.
Therefore, the choice of the steel or wire carrier depends to a large extent on the application situation and the desired appearance. (
Where aesthetics is important, it can disguise the effect of \"Hungry Horse).
A good solution is to use splicing joints, which can be applied to most profiles through a hot splicing/vulcanization process to chemically glue the two ends of the rubber extrusion together, this process affects a fairly strong dynamic joint, which is particularly effective if continuous rings or frames such as Windows or automotive applications are required.
Thus, both aesthetics and performance are enhanced, while providing a single piece installation that is easier and faster than the original strip that requires a corner joint.
Splicing joints ensure that the elastic and dynamic properties of profiles remain the same throughout the joints, resulting in endless sealing
Therefore, make sure that the gasket is more unpenetrating to the element.
This is especially important when moving vehicles are involved due to continuous bending of the structure when in use.
The vulcanization adhesive is less messy and easier to install than the adhesive joint-
It also lasts longer and does not crystallize, so it maintains elastic properties compared to the rubber part itself.
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