Top filled reclosable package with separate membrane and method for forming and filling the same
View Patent ↗A method of forming and sealing a flexible, reclosable package having a zipper closure and a slider mounted thereon. The reclosable package is initially formed having a pair of opposing side panels and a zipper closure extending between the pair of side panels. The zipper closure is initially attached to the side panels only along a pair of spaced side seals. The reclosable package is filled with product through a fill opening created between the zipper closure and either one of the side panels. Once the package is filled with product, the attachment flanges of the zipper closure are sealed to both of the side panels. Thus, the zipper closure is sealed to the side panels only after product has been inserted into the product package.
1. A method of making and filling a reclosable package comprising the steps of:
supplying a continuous web of plastic material folded to define first and second opposing side panels joined by a bottom wall;
supplying a zipper closure between the first and second opposing side panels, the zipper closure including a first profile member and a second profile member adapted to releasably interlock with each other;
sealing the first and second opposing side panels to each other along a pair of spaced side seals to define an open bag interior therebetween, wherein the zipper closure is attached to the first and second side panels only at the pair of spaced side seals;
filling the package with a product, the product passing between the zipper closure and one of the side panels; and
attaching the first profile member to the first side panel and the second profile member to the second side panel after the package has been filled with product.
2. The method of claim 1 wherein the zipper closure is supplied as a continuous length of zipper closure.
3. The method of claim 1 wherein the first and second profile members each include a depending attachment flange, wherein the attachment flange of each profile member is attached to one of the side panels.
4. The method of claim 3 wherein each of the attachment flanges includes a heat resistant layer to prevent sealing of the attachment flanges to each other during the attachment of the first and second profile elements to the side panels.
5. The method of claim 3 wherein each of the attachment flanges include a thickened portion to prevent the sealing of the attachment flanges to each other during the attachment of the male and female profile elements to the side panel.
6. The method of claim 3 wherein the zipper closure includes a membrane positioned between the attachment flanges of the first and second profile members, wherein the membrane extends across the bag interior when the attachment flanges are attached to the opposing side panels.
7. The method of claim 6 wherein said membrane is a separate component attached to said attachment flanges via a fusion, adhesive, or co-extrusion process, wherein said membrane incorporates one or more thickened areas.
8. The method of claim 7 further comprising the step of moving the zipper closure toward one of the side panels prior to filling the reclosable package with product.
9. The method of claim 7 wherein the step of attaching the zipper closure to the side panels after the package has been filled with product includes attaching the attachment flange of the first profile member to the first side panel and attaching the attachment member of the second profile member to the second side panel.
10. The method of claim 7 further comprising the step of sealing the first and second side panels to each other above the zipper closure and between the pair of spaced side seals after the package has been filled with product.
11. The method of claim 6 wherein said membrane comprises at least one layer of sealant, barrier, or adhesive materials or at least one layer of ionomer resins.
12. The method of claim 11 wherein said ionomer resins comprises Surlyn ionomer resins.
13. The method of claim 11 wherein the step of moving the zipper closure toward one of the side panels includes utilizing a flow of air to move the zipper closure.
14. The method of claim 11 wherein the step of moving the zipper closure toward one of the side panels includes utilizing a mechanical finger to move the zipper closure.
15. The method of claim 6 wherein said membrane includes a line of weakness that allows said membrane to separate during opening of the package.
16. The method of claim 15 wherein said line of weakness is formed from means comprising mechanical devices, laser scoring, or preferential orientation of the membrane.
17. The method of claim 1 wherein the bottom wall is gusseted.
18. The method of claim 1 wherein the spaced side seals are created by the application of heat to the pair of opposing side panels.
19. The method of claim 1 further comprising the step of sealing the first and second side panels to each other above the zipper closure and between the pair of spaced side seals after the package has been filled with product.
20. The method of claim 19 further comprising the step of creating a releasable seal between the first side panel and the second side panel after the package has been filled with product, the releasable seal being positioned below the zipper closure.
21. The method of claim 1 wherein the zipper closure includes a slider movable along the zipper closure.