| 摘要 |
The present invention has as its object a method for testing bottles or containers having flexible walls, as well as a plant implementing it, made to be inserted in lines for filling bottles made from plastic material (for example PET, HDPE, PE, etc...) or aluminium containers (for example cans, etc...) or containers made from polyethylene-coated paperboard (cartons) (generally all flexible containers), containing any type of liquid. Positioned at the output of the filling system (or possibly of the pasteurisation system) it is able to simultaneously check for the correct fill level, the presence of possible leaks in the sealing system of the container and possible constructive defects in the container (for example in the case of PET bottles, defects linked to the non-uniform distribution or incorrect weighting of the material during the extrusion or blowing step of the bottle). The test is carried out through the combination of two measurement systems, which are the fill level test and the measurement of the tension of the walls of the container. The results obtained from the level and wall tension measurements, suitably interpolated, provide the indicators necessary to establish whether the product being analysed should be considered suitable or else to be discarded since it is defective for at least one of the following reasons: - maximum fill level exceeded; - minimum fill level not reached; - detection of leaks in the lid, cap or seal or any other closing system of the container; - detection of leaks in the walls or bottom of the container (hole); - defect in the shape or thickness of the walls of the container.
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