| 摘要 |
A device for automatically determining the drying behaviour of paint or the like comprises at least two needles 10 which are moveable over a test sample or substrate 20 and at least one drive means 16 for moving the needles. The device is characterised by each needle having a respective coupling means 14 for individually coupling it to the drive means. If the paint is still liquid, the needle displaces the paint, but if dry, the needle is raised and moves over the coating. The drive means may be a threaded rod to which the coupling means meshes when engaged. In a preferred embodiment, each needle has an individual receiving means (24, Fig 4) for a substrate, and the needle is only lowered and its coupling means meshed after a sample has been inserted. This allows for a plurality of samples to be tested irrespective of the time of their production. |
