Processing and Testing

Processing and Testing of Pressure Compensation Seals

A Pressure Compensation Seal (PCS) is a functional part for which individually developed processing and testing systems are necessary. We offer different system solutions for small series up to fully automated processing plants and accompany you throughout the entire product development process.

General Processing Instructions

PCS surfaces must be protected from mechanical stress during the application and testing processes.

The airflow and water entry point tests provide the necessary information on functionality, thus ensuring error-free operation. 

We master the challenges of the different mounting systems for Pressure Compensation Seals with our individual solutions.

  • Self-adhesive Pressure Compensation Seals (PCS) require processing systems whose pressure stamps allow individual settings for time and force.
  • Ultrasonic weldable Pressure Compensation Seals (PCS) require application-specific sonotrodes and individual setting parameters.
Customer Acceptance of the Processing System

Our Quality Promise

  • Application and customer-oriented solution approaches
  • Functional tests (processing and testing) with original customer components and Schreiner PCS solutions
  • FAT (Factory Acceptance Test) or SAT (Site Acceptance Test)
  • Support for database connections 
  • CE (Conformité Européenne) / Declaration of incorporation of all devices 
  • Ensuring worldwide spare parts availability by using high-quality system components from brand manufacturers
  • Remote connection for system analysis
  • Worldwide on-site service
self-adhesive pressure compensation elements

Systems for Self-Adhesive Pressure Compensation Seals

Versatile processing solutions adapted to customer applications in combination with pressure compensation solutions from Schreiner Group.

  • Manual
  • Semiautomatic processing cell (customized)
  • Processing module for fully automatic process integration
System for application of self-adhesive pressure compensation seals
System for dispensing self-adhesive pressure equalization seals
ultrasonic-welded pressure compensation elements

Systems for Ultrasonic Weldable Pressure Compensation Seals

Ultrasonic welding flexibility for pre-cut and continuous Pressure Compensation Seals.

  • Manual processing cell
  • Processing module for fully automatic process integration

  • Longitudinal and torsional ultrasonic welding technologies

System for ultrasonic weldable pressure compensation elements
Longitudinal and torsional ultrasonic welding technologies
Airflow testing membranes

Test Station for Airflow Testing

Airflow is considered a measure of the gas permeability of a membrane. It indicates how great the protection of an enclosure is against compressive loads.

  • Manual test unit
  • Integrated test unit (individual process sequence)
Apply the airflow tester on top of the component hole.
The value indicated on the display of the airflow meter shows if the PCS functions correctly.
Water entry point testing for membranes

Test Station for Water Entry Point Testing

The water entry point is a gauge of the water retention capacity of a PCS. It indicates how high the protection of a membrane is against water ingress in an enclosure.

  • Manual Test Unit
Fill the vent hole with test water (water + 0.5% red, water-soluble ink such as oil-free Pelikan stamp ink).
Press the tube with the silicone rubber end against the component hole. Perform the water tightness test using compressed air. The compressed air will press the water against the PCS. Use a digital pressure gauge to set the required pressure level.

Optional System Extensions

Centring Unit
Increasing the positioning accuracy of the PCS on a component

Surface Pretreatment with Plasma
Activation and treatment of the component surface 

Rotary Indexing Table
Reduction of the cycle time of the processing

Presence Check
Ensuring PCS processing (compensating for empty spaces and avoiding multiple product placement)

NOK/OK Parts Marking
Marking of good/bad parts

Software Connection
MES (Manufacturing Execution System) and BUS (Binary Unit System) connection

PCS Centring Unit
Centring Unit
PCS Surface Pretreatment with Plasma
Surface Pretreatment with Plasma
Rotary Indexing Table
Rotary Indexing Table
PCS Presence Check
Presence Check
PCS Parts Marking
NOK/OK Parts Marking
Software Connection
Software Connection
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When applying, the sensitive membrane structure of the aeration elements requires special care.
▶  Processing of Pressure Compensation Seals Application of sensitive membranes

The Most Important Properties of Membranes

A membrane enables air exchange in enclosures and protects the electronics from liquid media and dirt. Learn more about the key functionalities and features of our aeration solutions.

Learn more

Air exchange membrane
Pressure Compensation Seal on cold metal
Product Solution

Pressure Compensation Seals for the Technical Industry

Pressure Compensation Seals enable pressure compensation in enclosures with their air-permeable membrane with oleophobic properties.

Find out more

Headlights automobile with moisture
Product Solution

Pressure Compensation Seals for the Automotive Industry

We offer Pressure Compensation Seals for numerous automotive applications: from sensors to electric motors to vehicle lighting.

Find out more

Frequently Asked Questions

What are self-adhesive Pressure Compensation Seals?

Self-adhesive Pressure Compensation Seals feature an adhesive ring for attachment. They can be applied easily and securely to the component—without additional fasteners or mechanical fixation.

When are self-adhesive membranes used, and when are ultrasonically welded membranes used?

Self-adhesive solutions are flexible and suitable for a wide variety of component surfaces, whether plastic or metal. Ultrasonically welded membranes are used only on plastic housings—primarily in semi- or fully automated processes at medium to high production volumes.

What is torsional ultrasonic welding for Pressure Compensation Seals?

In torsional ultrasonic welding, a rotational movement introduces energy into the weld zone. The process is particularly gentle on sensitive membrane variants and creates a precise, robust joint without damaging the delicate membrane surface.

What are the benefits of torsional ultrasonic welding?

The process introduces energy evenly and reduces the risk of perforation or material distortion. At the same time, it produces stable joints with short cycle times—particularly relevant for high-volume applications.

Which requirements must be considered when integrating Pressure Compensation Seals into the production process?

Safe integration requires stable process control, suitable joining parameters, and precise positioning. The application process must be designed so that the membrane is not damaged and a reliable joint is achieved. Only a coordinated integration process delivers reproducible quality in series production.

How can Pressure Compensation Seals be processed automatically?

Pressure Compensation Seals can be applied in semi- or fully automated processes. This ensures reproducible quality and efficient series production.

What role do contact pressure and dwell time play in the integration of Pressure Compensation Seals?

Contact pressure and other process parameters, such as dwell time or temperature, determine reliable application and the functionality of the Pressure Compensation Seal. Only controlled process management ensures that the membrane remains undamaged and the joint remains permanently stable. These parameters are defined for the specific application and are crucial for reproducible quality in series production.

How does Schreiner ProTech ensure Technical Cleanliness during processing?

High Technical Cleanliness requirements apply especially in the automotive and electronics industries. The Schreiner Services Competence Center develops processing solutions that provide optimal support for a clean production line.

Can Pressure Compensation Seals be tested after application?

Yes. Schreiner ProTech offers proprietary test equipment specifically designed for PCS, enabling airflow, water retention capacity, and other application-specific requirements to be tested directly after application. The test systems can be integrated into the respective manufacturing process at different levels of automation.

What support does Schreiner ProTech provide beyond the individual product?

In addition to Pressure Compensation Seals, Schreiner ProTech provides processing and testing systems as well as semi- or fully automated system solutions—from development through series production.

If you have any questions, please contact us.

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