| 摘要 |
The apparatus is intended for performing quality checks on preforms ( 10 ) each having a body made of plastics material having an internal cavity ( 12 ) communicating with the exterior through an end opening ( 14 ) of the body. The apparatus comprises: a conveyor device ( 20 ) for transporting the preforms ( 10 ) along a predetermined path, an optical device ( 22 ) disposed along the path and suitable for forming an image of each of the preforms ( 10 ), a pneumatic device ( 24 ) disposed along the path and suitable for putting the internal cavity ( 12 ) of each of the preforms ( 10 ) under partial vacuum for a predetermined period of time, an electronic control unit ( 28 ) suitable for comparing the images of the preforms ( 10 ) with a standard reference image and/or for checking whether the value of the partial vacuum remains unchanged during the said period of time, and a selector device ( 26 ) disposed along the path and capable of separating the preforms ( 10 ) on the basis of the result of the comparison and/or checking operations performed by the control unit ( 28 ).
|
