Reclosable package or bag with double zipper or similar configuratiion
The zipper profiles have a complex shape, such as a double zipper configuration. The apparatus for the manufacture thereof includes an extrusion die and further includes a main or primary extruder for the supply of material, such as low density polyethylene, to form the tubing for the manufacture of reclosable packages, bags or pouches. The apparatus further includes at least one secondary extruder, or co-extruder, for the extruding of each reclosable profile onto the tubing. The speed of the co-extruders is controlled so as to control the extrusion of the reclosable profiles.
1 . A zipper for a reclosable package or bag, the zipper including first and second interlocking profiles, the zipper formed a method including the following steps:
providing a primary extruder;
providing at least one secondary extruder;
providing an extrusion die plate with a primary channel for receiving primary material from the primary extruder for forming a film; and
providing the extrusion die plate further including at least one secondary channel for receiving secondary material from the at least one secondary extruder for forming the first and second reclosable zipper profiles.
2 . The zipper of claim 1 wherein the method for forming the zipper further includes the step of providing a control device for controlling velocity of flow of the secondary material to provide desired shapes of the reclosable zipper profiles.
3 . The zipper of claim 2 wherein the first interlocking profile includes first and second male elements and the second interlocking profile includes first and second female elements for receiving the respective first and second male elements.
4 . The zipper of claim 3 wherein the first and second male elements terminate in respective first and second enlarged elements.
5 . The zipper of claim 3 wherein the first and second enlarged elements include a first side which is more enlarged than a second side.
6 . The zipper of claim 5 wherein the zipper is more easily separated when force is applied to one side rather than another side.
7 . The zipper of claim 3 wherein the first and second female elements are supported by respective first and second stems.
8 . The zipper of claim 3 wherein the first and second female elements each include two J-shaped arms for engaging the respective first and second enlarged elements of the respective first and second male elements.
9 . The zipper of claim 2 wherein the first interlocking profile includes a first male element and a first female element and the second interlocking profile includes a second male element and a second female element, wherein the first and second female elements receive the respective first and second male elements.
10 . The zipper of claim 9 wherein the first and second male elements terminate in respective first and second enlarged elements.
11 . The zipper of claim 9 wherein the first and second enlarged elements include a first side which is more enlarged than a second side.
12 . The zipper of claim 11 wherein the zipper is more easily separated when force is applied to one side rather than another side.
13 . The zipper of claim 9 wherein the first and second female elements are supported by respective first and second stems.
14 . The zipper of claim 9 wherein the first and second female elements each include two J-shaped arms for engaging the respective first and second enlarged elements of the respective first and second male elements.
15 . The zipper of claim 2 wherein the first interlocking profile includes first and second male elements and the second interlocking profile includes first and second female elements for receiving the respective first and second male elements, and wherein the first interlocking profile further includes a third female element between the first and second male elements and the second interlocking profile further includes a third male element between the first and second female elements.
16 . The zipper of claim 15 wherein the first, second and third male elements terminate in respective first, second and third enlarged elements.
17 . The zipper of claim 15 wherein the first, second and third enlarged elements include a first side which is more enlarged than a second side.
18 . The zipper of claim 17 wherein the zipper is more easily separated when force is applied to one side rather than another side.
19 . The zipper of claim 15 wherein the first, second and third female elements are supported by respective first, second and third stems.
20 . The zipper of claim 15 wherein the first, second and third female elements each include two J-shaped arms for engaging the respective first, second and third enlarged elements of the respective first, second and third male elements.