When sealing aspire® membrane products to plastic parts there are a several factors to take into consideration. These include membrane handling, design elements, and properties of the support materials. Consideration also needs to be given to how the seal is created.
- Will the membrane be in contact with the plastic part?
- Will the support material be in contact with the plastic part?
- What are the thermoplastic characteristics of the two materials?
- Are the materials the same or different?
- When handling membranes it is recommended to wear latex-free gloves or finger cots. Oils on the skin can adversely affect membrane properties.
- Parts and work surfaces must be clean and free of particles.
- Static elimination is advised when handling and placing membrane.
- Relative humidity of 50% and temperature of 21° C (~70°F) are recommended.
- The design of the seal area is an essential factor in the integrity of the finished seal.
- It is advantageous to have a radius in all angles in contact with a membrane.
- It is preferable to have flow in the finished device go in the direction of the seal so that the membrane is supported.
- aspire® medias are available with a variety of supporting substrates. The support material influences many of the sealing and handling considerations.
- Dwell time and melting temperature and pressure are important attributes to factor when sealing either to membrane or support sides of aspire® medias.
- Adhesive sealing
- Mechanical sealing – including molding
- Heat sealing
- Heated dies
- Radio frequency
- Ultrasonic welding