Method of testing for a leak with the inner vessel of a...

G - Physics – 01 – M

Patent

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G01M 3/32 (2006.01) B65D 1/02 (2006.01)

Patent

CA 2265625

This invention provides double blow molded bottles of synthetic resins, which are given consistent quality by making it possible to detect the existence of a leak in the inner vessel in which to store the liquid contents. The bottles of consistent quality can be provided by a method of leak test, which comprises forming an air channel (10) between an outer vessel (2) and said inner vessel (3) by deflating and peeling said inner vessel (3) from said outer vessel (2) and by securing air flow through an opening (5) of said air channel (10), and judging the existence or non-existence of a leak through the wall of said inner vessel (3) by supplying air to said inner vessel (3) at a given micropressure and by observing, after a certain period of elapsed time, whether or not the pressure inside said inner vessel (3) reaches the predetermined level which has been set from a test conducted under the same conditions using the bottles (1) with no leak through the wall of said inner vessel (3).

L'invention porte sur un procédé de contrôle des fuites de l'enveloppe intérieure de récipients de résine synthétique à paroi double produits par injection soufflage capable de détecter la présence d'un ou plusieurs trous dans ladite enveloppe destinée à recevoir un liquide, afin de pouvoir garantir sa qualité. Ledit procédé comporte les étapes suivantes: séparation de l'enveloppe intérieure (3) d'avec l'enveloppe extérieure (2) par déformation contraction de manière à former entre les deux enveloppes un espace (10) communiquant avec l'ouverture (5); remplissage de l'enveloppe intérieure (3) d'air sous une très faible pression prédéterminée; constat de la présence d'un ou plusieurs trous selon que la pression régnant dans l'enveloppe après un temps déterminé atteint ou non une valeur prédéterminée préalablement fixée par des mesures faites dans les mêmes conditions sur un récipient (1) dont l'enveloppe intérieure (3) est intacte.

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