เครื่องทดสอบความล้าของโฟมแบบลูกกลิ้ง Roller Shear Machine

• Perforated-Base Platen: measuring 500mm x 500mm by 10mm. The centre section has 6.5mm holes covering a total area of 360mm x 360mm
• Roller: measuring 450mm in length with a diameter of 76.0 ± 1.3mm
• Counter: To set the counter to the predetermined test procedure: Procedure A: 8000 cycles & Procedure B: 20 000 cycles
• Limit Switches: installed in the Roller Shear Machine for added safety. If the doors of the machine are opened during a test, the test will automatically stop. To begin testing again, close the doors and press the START button.

Test Specimens

Test specimens to be used on the Roller Shear Machine shall be 380mm long and 300mm wide. The specimen thickness shall be at least 25mm thick, but no greater than 125mm. However, it is preferred to be 50mm thick.

Specimens shall be prepared by saw. Condition the test specimen as per standard requirements. One specimen shall be tested at a time.

Test Procedure

• Prepare your test specimen for testing
• Connect the power to the mains, and switch ON the machine
• Place the test specimen on the base platen ready for testing. Ensure the long dimension is parallel to the stroke of the Roller Shear Machine.
• Fasten the test specimen by means of tape and metal retainer
• Lower the roller down to the specimen, with the weights provided positioned to the top of the roller assembly so that a constant force of 130 ± 2N is obtained
• Set the Counter on the machine to desired number of cycles as per Procedure A or Procedure B (8000 cycles or 20 000 cycles)
• Press START on the machine to begin testing
• When testing is complete, remove the test specimen, and record the Thickness Loss within 60 ± 5 mins using the IRGL method (this can be done using an IDM Foam Compression Machine).