| 摘要 |
In non-destructive method the state of ageing of plastics products is determined by means of infrared radiation, which is passed through the product. …<??>The invention is based upon the discovery that there is a clear relationship between certain physical and/or chemical changes occurring during the course of time in the interior of plastics materials, detectable by infrared analysis, and the mechanical properties of the product. On the basis of this relationship, the method may be used to decide whether products can be safely used or whether they must be disqualified and removed. …<??>The method is particularly well suited with crates which are to contain bottles; the radiation is then passed through a crate wall. …<??>Apparatus for performing the method may be arranged in a line such as a conveyor belt bottling line. |
