| 摘要 |
<p>There are practical difficulties in dosing a component of a composition (2) into its container (14), such as a personal care product into a hand-holdable dispenser on a filling line, due in part to the short time that is available for the operation. The difficulties can be ameliorated or overcome by employing dosing apparatus (4) in which the length of time that an in-line valve (9) is controlled by a feed-back loop in which the stream of liquid (18) dosed into the container (14) from a dosing nozzle (11) positioned above the container is scanned by a laser-generated beam (19) at frequent intervals from which the volume of liquid in a dose can be calculated and compared with a predetermined range to identify whether and the extent to which the period of time for which the valve (9) is open for a succeeding dose is altered.</p> |
