High speed bag closure extrusion

Details High speed bag closure extrusion High speed bag closure extrusion

B - Operations, Transporting

29

C

B29C 47/88 (2006.01) B29D 5/10 (2006.01)

Patent

CA 2356650

Disclosed herein is a method for the high speed extrusion of profile elements (16) for home storage units such as reclosable thermoplastic bags. Interlocking elements or plastic zipper strips are extruded directly into a waterbath (17) to be quenched, and drawn through said bath (17) for a distance sufficient to cool said elements (16) to the below softening point of the extruded material. Collection rates of from about 200 to about 350 linear feet per minute are achieved by passsing the elements through a depth of at least 3 feet of water prior to their first contact with a solid handling element (19).

L'invention concerne un procédé d'extrusion à haute vitesse d'éléments profilés (16) destinés à des unités de stockage domestiques telles que des sacs thermoplastiques refermables. Des éléments de fermeture ou des bandes d'ouverture en plastique sont extrudés directement dans une poche d'eau (17) à refroidir, puis retirés à travers ladite poche (17) sur une distance suffisante pour refroidir lesdits éléments à la température de ramollissement inférieure du matériau extrudé. Les vitesses de collecte, environ 200 à 350 pieds linéaires par minute, sont obtenues par le passage, dans l'eau à une profondeur d'au moins 3 pieds, desdits éléments avant leur premier contact avec un élément de manipulation solide (19).

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