Multichamber container with expanded interior walls

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 49/16 (2006.01) B29C 45/26 (2006.01) B29C 49/00 (2006.01) B29C 49/12 (2006.01) B29C 49/48 (2006.01) B29C 49/58 (2006.01) B65D 1/04 (2006.01) B29C 49/04 (2006.01) B29C 49/06 (2006.01)

Patent

CA 2275331

Multichamber tubular containers (50) are made by extrusion or injection stretch blow molding. The containers usually will have two or three chambers and one or more web walls (42). The web walls are relatively rigid as formed. The web walls (42) must be stretched laterally to increase their flexibility which is needed for the uniform dispensing of product from the tubular chambers. The webs (42) can be stretched mechanically by the rotation of rods (46), such as stretch rods, or pneumatically by a differential gas pressure in the chambers while the webs (42) are at or near the glass transition temperature and can flow. The web walls for a circular tubular container can be stretched up to about one-half the diameter of the tubular container.

On fabrique des récipients tubulaires (50) à plusieurs compartiments par extrusion ou par moulage par injection, étirage et soufflage. Les récipients comportent habituellement deux ou trois compartiments et une ou plusieurs parois en bandes (42). Les parois sont relativement rigides une fois formées. Elles doivent être étirées latéralement, ce qui augmente la flexibilité nécessaire à la distribution uniforme du produit depuis les compartiments tubulaires. Les bandes (42) peuvent être étirées mécaniquement par la rotation de tiges (46), telles que des tiges d'étirement, ou pneumatiquement par une pression gazeuse différentielle dans les compartiments alors que les bandes (42), à une température égale à ou proche de la température de transition vitreuse, sont fluides. Les parois en bandes destinées à un récipient tubulaire circulaire peuvent être étirées jusqu'à la moitié environ du diamètre du récipient.

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