| 摘要 |
Apparatus 2 includes a platform 14 on which is supported, via spaced apart posts 16, a stationary rigid support disc 17. Between the platform 14 and disc 17, plaque holder 18 is rotatably mounted. The plaque holder is arranged to hold a plaque 19 for assessment. The plaque is made by injection moulding from a composition comprising a polymeric material and a specific amount of reheat additive(s) and any other additives(s) to be assessed. The plaque holder is arranged to move the plaque relative to the disc 17. In an input position, the plaque holder 18 is arranged directly underneath opening 20. In a measurement position, which is 90° from the input position, there are provided first and second temperature measuring assemblies 24, 26 arranged to measure the temperature of the top and bottom surfaces of a plaque held in the plaque holder. The plaque holder can be rotated through 90° from the measurement position to a heating position, wherein the plaque is positioned directly below a heat lamp. In use, the plaque holder is rotated to the heating position, wherein the plaque is heated by the lamp for a predetermined time. Then the plaque holder is rapidly rotated back to the measurement position, wherein the temperatures of the upper and lower surfaces of the plaque are rapidly measured. These steps are repeated and data recorded to allow reheat and/or other characteristics of the plaque to be assessed over time. |
