Membrane-pressed MDF panels fill the bill; converting from metal powder finishes to thermoplastics re-defines the appearance, durability and repairability of Sprint's bill payment kiosks

Wood & Wood Products, Nov, 2004

After CNC routing, substrates are sprayed with adhesive, placed on a bed, covered with thermoplastic sheet and rolled into a membrane-pressing chamber, where the sheet is heated to 325F to 395F (163C to 200C). A vacuum then draws the sheet onto the substrate as a flexible membrane physically presses the sheet onto all top and side surfaces, including undercut edges. Once cooled, excess sheet extending beyond the bottom surface is trimmed.

The 3-D capabilities of membrane pressing offer greater design freedom than flat laminating, according to Zaken, and can improve durability when specialized thermoplastic sheet products that resist impact, chemicals and fire are specified.

If desired, outside corners and sharp edges can be beveled or rounded to reduce damage and/or improve safety. When total encapsulation of the part is desired, pre-laminated substrates can be utilized.